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Investment Securities - Scheduled Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale, Maturing within one year, Amortized Cost	$ 364us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Available-for-Sale, Maturing after one to five years, Amortized Cost	7,986us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Available-for-Sale, Maturing after five to ten years, Amortized Cost	125,908us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Available-for-Sale, Maturing after ten years, Amortized Cost	67,781us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Available-for-Sale, Amortized Cost	202,039us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis	134,908us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available-for-Sale, Maturing within one year, Estimated Fair Value	365us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Available-for-Sale, Maturing after one to five years, Estimated Fair Value	8,378us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Available-for-Sale, Maturing after five to ten years, Estimated Fair Value	126,974us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Available-for-Sale, Maturing after ten years, Estimated Fair Value	69,249us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Available-for-Sale, Estimated Fair Value, Total	204,966us-gaap_AvailableForSaleSecuritiesDebtSecurities	135,754us-gaap_AvailableForSaleSecuritiesDebtSecurities
Held-to-Maturity, Maturing within one year, Amortized Cost	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Held-to-Maturity, Maturing after one to five years, Amortized Cost	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Held-to-Maturity, Maturing after five to ten years, Amortized Cost	2,738us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Held-to-Maturity, Maturing after ten years, Amortized Cost	26,382us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Held-to-Maturity, Amortized Cost	29,120us-gaap_HeldToMaturitySecurities	35,050us-gaap_HeldToMaturitySecurities
Held-to-Maturity, Maturing within one year, Estimated Fair Value	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Held-to-Maturity, Maturing after one to five years, Estimated Fair Value	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Held-to-Maturity, Maturing after five to ten years, Estimated Fair Value	2,759us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Held-to-Maturity, Maturing after ten years, Estimated Fair Value	26,395us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Held-to-Maturity, Estimated Fair Value, Total	$ 29,154us-gaap_HeldToMaturitySecuritiesFairValue

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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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