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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ 3,252us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	$ 685us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(5,627)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(1,297)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Net current period other comprehensive income (loss), Pre-tax	(2,375)us-gaap_OtherComprehensiveIncomeLossBeforeTax	(612)us-gaap_OtherComprehensiveIncomeLossBeforeTax
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	1,255us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	264us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax	(2,171)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	(500)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Net current period other comprehensive income (loss), Tax	(916)us-gaap_OtherComprehensiveIncomeLossTax	(236)us-gaap_OtherComprehensiveIncomeLossTax
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	1,997us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	421us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(3,456)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(797)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Net current period other comprehensive income (loss), After-tax	$ (1,459)us-gaap_OtherComprehensiveIncomeLossNetOfTax	$ (376)us-gaap_OtherComprehensiveIncomeLossNetOfTax	$ 0us-gaap_OtherComprehensiveIncomeLossNetOfTax

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