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Comprehensive Income - Other Comprehensive (Loss) Income Included in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unrealized holding gains (losses) on:      
Available for sale securities, Pre-Tax $ (1,589) $ (585) $ (2,048)
Available for sale securities - OTTI, Pre-Tax 294 (224) (258)
Reclassification adjustments for gains on available for sale securities, Pre-Tax (553) (169) (612)
Other comprehensive income, Pre-Tax (1,848) (978) (2,918)
Available for sale securities, tax benefit (expense) 333 198 697
Available for sale securities - OTTI, tax benefit (expense) (61) 76 88
Reclassification adjustments for gains on available for sale securities, tax benefit (expense) 116 57 207
Other comprehensive income, tax benefit (expense) 388 331 992
Available for sale securities, net of tax (1,256) (387) (1,351)
Available for sale securities - OTTI, net of tax 233 (148) (170)
Reclassification adjustments for gains on available for sale securities, net of tax (437) (112) (405)
Total other comprehensive loss $ (1,460) $ (647) $ (1,926)