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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]        
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax $ (1,282) $ (1,004) $ (815) $ 3,446
Less: Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax (11) (501) (292) (5,353)
Net current period other comprehensive income (loss), Pre-tax (1,293) (1,505) (1,107) (1,907)
Net unrealized gains (losses) on investments available for sale arising during the period, Tax (495) (388) (314) 1,329
Less: Amounts reclassified from accumulated other comprehensive income (loss), Tax (4) (193) (113) (2,065)
Net current period other comprehensive income (loss), Tax (499) (581) (427) (736)
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax (787) (616) (501) 2,117
Less: Amounts reclassified from accumulated other comprehensive income (loss), After-tax (7) (308) (179) (3,288)
Net current period other comprehensive income (loss), After-tax $ (794) $ (924) $ (680) $ (1,171)