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Fair Values - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Mortgage Loans Held for Sale $ 5,264us-gaap_MortgagesHeldForSaleFairValueDisclosure $ 1,666us-gaap_MortgagesHeldForSaleFairValueDisclosure
Mortgage IRLCs 70us-gaap_DerivativeAssets 61us-gaap_DerivativeAssets
Level 1    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Mortgage IRLCs 0us-gaap_DerivativeAssets
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0us-gaap_DerivativeAssets
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Level 2    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Mortgage Loans Held for Sale 5,264us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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1,666us-gaap_MortgagesHeldForSaleFairValueDisclosure
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Mortgage IRLCs 70us-gaap_DerivativeAssets
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61us-gaap_DerivativeAssets
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Level 3    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Mortgage IRLCs 0us-gaap_DerivativeAssets
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0us-gaap_DerivativeAssets
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Fair value swap    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Swaps, fair value 226us-gaap_DerivativeLiabilities
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= us-gaap_SwapMember
135us-gaap_DerivativeLiabilities
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Fair value swap | Level 3    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Swaps, fair value 226us-gaap_DerivativeLiabilities
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135us-gaap_DerivativeLiabilities
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Recurring basis    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Mortgage Loans Held for Sale 5,264us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
1,666us-gaap_MortgagesHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Mortgage IRLCs 70us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
61us-gaap_DerivativeAssets
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= us-gaap_FairValueMeasurementsRecurringMember
Recurring basis | Level 2    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Mortgage Loans Held for Sale 5,264us-gaap_MortgagesHeldForSaleFairValueDisclosure
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1,666us-gaap_MortgagesHeldForSaleFairValueDisclosure
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Mortgage IRLCs 70us-gaap_DerivativeAssets
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61us-gaap_DerivativeAssets
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Recurring basis | Obligations of U.S. Treasury and other U.S. Government sponsored entities    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 538,064us-gaap_InvestmentsFairValueDisclosure
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525,136us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | Obligations of U.S. Treasury and other U.S. Government sponsored entities | Level 2    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 538,064us-gaap_InvestmentsFairValueDisclosure
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525,136us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 761,153us-gaap_InvestmentsFairValueDisclosure
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648,471us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities | Level 2    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 761,153us-gaap_InvestmentsFairValueDisclosure
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648,471us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | Equity securities    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 2,698us-gaap_InvestmentsFairValueDisclosure
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2,659us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | Equity securities | Level 1    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 1,922us-gaap_InvestmentsFairValueDisclosure
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1,900us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | Equity securities | Level 3    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investment Securities 776us-gaap_InvestmentsFairValueDisclosure
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759us-gaap_InvestmentsFairValueDisclosure
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Recurring basis | Fair value swap    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Swaps, fair value 226us-gaap_DerivativeLiabilities
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Recurring basis | Fair value swap | Level 3    
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]    
Swaps, fair value $ 226us-gaap_DerivativeLiabilities
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$ 135us-gaap_DerivativeLiabilities
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