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Quarterly Results of Operations (Unaudited) - Summary of Quarterly Consolidated Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 29,390 $ 28,962 $ 24,650 $ 23,528 $ 23,790 $ 23,578 $ 21,127 $ 20,093 $ 106,529 $ 88,588 $ 76,205
Interest expense 8,450 4,552 3,781 3,754 3,568 3,802 3,277 3,207 20,537 13,854 13,222
Net interest income 20,940 24,410 20,869 19,774 20,222 19,776 17,850 16,886 85,992 74,734 62,983
Provision for loan losses 623 455 232 532 342 300 1,906 614 1,842 3,162 3,058
Gain on sale of securities 961   767 108 65     124 1,836 189 988
Net income 5,603 6,602 6,326 5,381 6,175 4,288 4,728 5,358 23,912 20,549 18,101
Net Income Available to Common Shareholders $ 5,603 $ 6,602 $ 6,326 $ 5,339 $ 6,144 $ 4,257 $ 4,697 $ 5,327 $ 23,870 $ 20,424 $ 17,968
Earnings per share:                      
Basic $ 0.25 $ 0.31 $ 0.35 $ 0.30 $ 0.34 $ 0.25 $ 0.34 $ 0.39 $ 1.19 [1] $ 1.30 [1] $ 1.32 [1]
Diluted $ 0.25 $ 0.30 $ 0.34 $ 0.30 $ 0.34 $ 0.24 $ 0.33 $ 0.37 $ 1.19 [1] $ 1.26 [1] $ 1.27 [1]
Average shares outstanding:                      
Basic 22,155,549 21,538,752 18,268,880 17,924,124 17,905,871 17,408,964 13,860,008 13,824,017 19,987,728 15,765,444 13,591,053
Diluted 22,283,722 21,651,953 18,364,167 18,012,726 18,020,615 17,839,881 14,456,379 14,414,259 20,082,410 16,197,312 14,181,188
[1] Adjusted for 3:2 stock split on November 14, 2016.