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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	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ 2,121us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	$ 1,084us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(171)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	(902)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Net current period other comprehensive income (loss), Pre-tax	1,950us-gaap_OtherComprehensiveIncomeLossBeforeTax	182us-gaap_OtherComprehensiveIncomeLossBeforeTax
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	818us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	418us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax	(65)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	(348)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Net current period other comprehensive income (loss), Tax	753us-gaap_OtherComprehensiveIncomeLossTax	70us-gaap_OtherComprehensiveIncomeLossTax
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	1,303us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	666us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(106)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(554)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Net current period other comprehensive income (loss), After-tax	$ 1,197us-gaap_OtherComprehensiveIncomeLossNetOfTax	$ 112us-gaap_OtherComprehensiveIncomeLossNetOfTax

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