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Investment Securities - Investments by contractual maturity (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost |
Within one year, estimated fair value | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
After one year through five years, amortized cost | 2,904,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |
After one year through five years, estimated fair value | 3,167,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
After five years through ten years, amortized cost | 17,592,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost |
After five years through ten years, estimated fair value | 18,457,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
After ten years, amortized cost | 122,847,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |
After ten years, estimated fair value | 127,671,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Total securities with single maturity date, amortized cost | 143,343,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis |
Total securities with single maturity date, estimated fair value | 149,295,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate |
Debt securities, amortized cost | 423,639,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost |
Available-for-sale investment securities | 432,535,000 us-gaap_AvailableForSaleSecurities | 443,224,000 us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |
After ten years, Amortized Cost | 31,964,000 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |
After ten years, Estimated Fair Value | 35,096,000 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue |
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 33,088,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
Investment securities not due at a single maturity date, estimated fair value | 33,090,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 236,629,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Investment securities not due at a single maturity date, estimated fair value | 237,872,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Private label residential mortgage backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 3,079,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |
Investment securities not due at a single maturity date, estimated fair value | 4,693,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |
Other equity securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 7,500,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Investment securities not due at a single maturity date, estimated fair value | $ 7,585,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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