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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Equity [Abstract]        
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax $ (1,004) $ 3,507 $ 3,446 $ (739)
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax (501) (56) (5,353) (55)
Net current period other comprehensive income (loss), Pre-tax (1,505) 3,451 (1,907) (794)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax (388) 1,353 1,329 (285)
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax (193) (22) (2,065) (21)
Net current period other comprehensive income (loss), Tax (581) 1,331 (736) (306)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax (616) 2,154 2,117 (454)
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax (308) (34) (3,288) (34)
Net current period other comprehensive income (loss), After-tax $ (924) $ 2,120 $ (1,171) $ (488)