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Accumulated Other Comprehensive Income (Details 1) (USD $)
In Thousands, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Dec. 27, 2014
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Sep. 27, 2014
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Jun. 28, 2014
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Mar. 29, 2014
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Dec. 28, 2013
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Sep. 28, 2013
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Jun. 29, 2013
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Mar. 30, 2013
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Dec. 27, 2014
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Dec. 28, 2013
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Dec. 29, 2012
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| Summary of reclassifications out of Accumulated Other Comprehensive Income |
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Total before tax |
$ 15,370us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 15,001us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 18,424us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 16,947us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 12,707us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 12,794us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 17,516us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 14,154us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 65,742us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 57,172us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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$ 55,853us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Tax benefit |
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(21,967)us-gaap_IncomeTaxExpenseBenefit
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(19,188)us-gaap_IncomeTaxExpenseBenefit
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(18,455)us-gaap_IncomeTaxExpenseBenefit
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Total net of tax |
10,327us-gaap_NetIncomeLoss
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9,877us-gaap_NetIncomeLoss
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12,186us-gaap_NetIncomeLoss
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11,385us-gaap_NetIncomeLoss
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8,343us-gaap_NetIncomeLoss
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8,275us-gaap_NetIncomeLoss
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11,790us-gaap_NetIncomeLoss
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9,575us-gaap_NetIncomeLoss
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43,775us-gaap_NetIncomeLoss
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37,984us-gaap_NetIncomeLoss
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37,398us-gaap_NetIncomeLoss
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| Reclassification out of Accumulated Other Comprehensive Income [Member] |
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| Summary of reclassifications out of Accumulated Other Comprehensive Income |
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Total net of tax |
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115us-gaap_NetIncomeLoss
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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| Unrealized gains and losses on available-for-sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |
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| Summary of reclassifications out of Accumulated Other Comprehensive Income |
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Total before tax |
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182us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Tax benefit |
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(67)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Total net of tax |
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115us-gaap_NetIncomeLoss
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
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| Accumulated Other-than-Temporary Impairment [Member] | Unrealized gains and losses on available-for-sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |
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| Summary of reclassifications out of Accumulated Other Comprehensive Income |
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| Amount Reclassified from AOCI, Unrealized gains and losses on available-for-sale securities, Realized gain/(loss) on sale of securities |
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$ 182us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
/ us-gaap_OtherComprehensiveIncomeLocationAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
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