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Investment Securities - Maturities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Amortized Cost, Within one year	$ 36,925us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	$ 39,778us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Held to Maturity, Amortized Cost, After one but within five years	44,701us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	50,983us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Held to Maturity, Amortized Cost, After five years through ten years	12,216us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	11,679us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Held to Maturity, Amortized Cost, After ten years	13,634us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	13,997us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Held to Maturity, Amortized Cost, Total	107,476us-gaap_HeldToMaturitySecurities	116,437us-gaap_HeldToMaturitySecurities
Available for Sale Securities, Amortized Cost, Within one year	5,769us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	2,378us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Available for Sale, Amortized Cost, After one but within five years	50,411us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	43,866us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Available for Sale, Amortized Cost, After five years through ten years	9,312us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	9,644us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Available for Sale, Amortized Cost, After ten years	136,076us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	143,157us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Available for Sale, Amortized Cost, Total	201,568us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis	199,045us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Held to Maturity, Fair Value, Within one year	37,015us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	39,913us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Held to Maturity, Fair Value, After one but within five years	45,804us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	51,953us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Held to Maturity, Fair Value, After five years through ten years	12,871us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	12,426us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Held to Maturity, Fair Value, After ten years	14,095us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	14,351us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Held to maturity, Fair Value	109,785us-gaap_HeldToMaturitySecuritiesFairValue	118,643us-gaap_HeldToMaturitySecuritiesFairValue
Available for Sale, Fair Value, Within one year	5,816us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	2,388us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Available for Sale, Fair Value, After one but within five years	50,686us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	43,919us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Available for Sale, Fair Value, After five years through ten years	9,471us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	9,749us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Available for Sale, Fair Value, After ten years	138,707us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	144,792us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Available for Sale, Fair Value, Total	$ 204,680us-gaap_AvailableForSaleSecuritiesDebtSecurities	$ 200,848us-gaap_AvailableForSaleSecuritiesDebtSecurities

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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