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Condensed Financial Information (Parent Company Only) - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Condensed Comprehensive Income [Line Items]                      
Net income $ 2,278 $ 2,323 $ 2,265 $ 2,063 $ 1,465 $ 1,282 $ 977 $ 600 $ 8,929 $ 4,324 $ 4,593
Other comprehensive income (loss)                      
Net unrealized holding gains (losses) on securities available for sale                 (1,669) 3,260 (6,462)
Reclassification adjustment for (gains) losses realized                 0 (538) 63
Net unrealized holding gains (losses) on securities available for sale for which an other-than-temporary impairment has been recognized in income                 0 751 (129)
Reclassification adjustment for other-than-temporary impairment loss recognized in income                 0 0 49
Other comprehensive income (loss) before tax                 (1,669) 3,473 (6,479)
Income tax provision (benefit)                 (595) 1,236 (2,289)
Other comprehensive income (loss) - net of tax                 (1,074) 2,237 (4,190)
Comprehensive income                 7,855 6,561 403
Parent Company                      
Schedule Of Condensed Comprehensive Income [Line Items]                      
Net income                 8,929 4,324 4,593
Other comprehensive income (loss)                      
Net unrealized holding gains (losses) on securities available for sale                 (1,669) 3,260 (6,462)
Reclassification adjustment for (gains) losses realized                 0 (538) 63
Net unrealized holding gains (losses) on securities available for sale for which an other-than-temporary impairment has been recognized in income                 0 751 (129)
Reclassification adjustment for other-than-temporary impairment loss recognized in income                 0 0 49
Other comprehensive income (loss) before tax                 (1,669) 3,473 (6,479)
Other comprehensive income (loss) - net of tax                 (1,074) 2,237 (4,190)
Comprehensive income                 $ 7,855 $ 6,561 $ 403