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Comprehensive Income - Other Comprehensive (Loss) Income Included in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrealized holding gains (losses) on:      
Available for sale securities, Pre-Tax $ (585) $ (2,048) $ (1,698)
Available for sale securities - OTTI, Pre-Tax (224) (258) 359
Derivatives, Pre-Tax     389
Reclassification adjustments for gains on available for sale securities, Pre-Tax (169) (612) (691)
Other comprehensive income, Pre-Tax (978) (2,918) (1,641)
Available for sale securities, tax benefit (expense) 198 697 577
Available for sale securities - OTTI, tax benefit (expense) 76 88 (122)
Derivatives, tax benefit (expense)     (132)
Reclassification adjustments for gains on available for sale securities, tax benefit (expense) 57 207 235
Other comprehensive income, tax benefit (expense) 331 992 558
Available for sale securities, net of tax (387) (1,351) (1,121)
Available for sale securities - OTTI, net of tax (148) (170) 237
Derivatives, net of tax     257
Reclassification adjustments for gains on available for sale securities, net of tax (112) (405) (456)
Total other comprehensive income (loss) $ (647) $ (1,926) $ (1,083)