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Securities - Maturity of Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Held for Investment, Contractual maturity of debt securities, Amortized Cost
Amortized cost, Within one year	$ 1,451us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	$ 3,640us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
Amortized cost, After one year but within five years	6,603us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	7,277us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
Amortized cost, After five years but within ten years	380us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	837us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Amortized cost, After ten years	159us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	232us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
Amortized Cost	8,593us-gaap_HeldToMaturitySecurities	11,986us-gaap_HeldToMaturitySecurities
Available for sale, Contractual maturity of debt securities, Amortized Cost
Amortized Cost, Within one year	41,772us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	208,625us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Amortized Cost, After one year but within five years	350,975us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	167,554us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Amortized Cost, After five years but within ten years	21,990us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	27,195us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Amortized Cost, After ten years	87,252us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	97,542us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Total debt securities	501,989us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis	500,916us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Amortized Cost, Equity securities	7,364us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis	8,715us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Amortized Cost, Total	509,353us-gaap_AvailableForSaleSecuritiesAmortizedCost	509,631us-gaap_AvailableForSaleSecuritiesAmortizedCost
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	1,456us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	3,649us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
Estimated Fair Value, After one year but within five years	6,642us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	7,321us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Estimated Fair Value, After five years but within ten years	396us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	865us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Estimated Fair Value, After ten years	177us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	259us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
Estimated Fair Value	8,671us-gaap_HeldToMaturitySecuritiesFairValue	12,094us-gaap_HeldToMaturitySecuritiesFairValue
Available for sale, Contractual maturity of debt securities, Estimated Fair Value
Estimated Fair Value, Within one year	41,870us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	209,065us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Estimated Fair Value, After one year but within five years	352,044us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	168,210us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Estimated Fair Value, After five years but within ten years	22,717us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	27,797us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Estimated Fair Value, After ten years	88,132us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	98,551us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Total debt securities	504,763us-gaap_AvailableForSaleSecuritiesDebtSecurities	503,623us-gaap_AvailableForSaleSecuritiesDebtSecurities
Estimated Fair Value, Equity securities	11,427us-gaap_AvailableForSaleSecuritiesEquitySecurities	12,018us-gaap_AvailableForSaleSecuritiesEquitySecurities
Estimated Fair Value, Total	$ 516,190us-gaap_AvailableForSaleSecurities	$ 515,641us-gaap_AvailableForSaleSecurities

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Fair value of held-to-maturity debt securities maturing after 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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