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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 36,774 $ 32,070 $ 30,805 $ 28,834 $ 29,390 $ 28,962 $ 24,650 $ 23,528 $ 128,483 $ 106,529 $ 88,588
Interest expense 5,319 4,191 3,607 3,266 8,450 4,552 3,781 3,754 16,383 20,537 13,854
Net interest income 31,455 27,879 27,198 25,568 20,940 24,410 20,869 19,774 112,100 85,992 74,734
Provision for loan losses 1,100 710 330 330 623 455 232 532 2,470 1,842 3,162
Gain on sale of securities   6 (3) 35 961   767 108 38 1,836 189
Net income 7,650 8,171 9,072 8,224 5,603 6,602 6,326 5,381 33,117 23,912 20,549
Net Income Available to Common Shareholders $ 7,650 $ 8,171 $ 9,072 $ 8,224 $ 5,603 $ 6,602 $ 6,326 $ 5,339 $ 33,117 $ 23,870 $ 20,424
Earnings per share:                      
Basic $ 0.30 $ 0.36 $ 0.41 $ 0.37 $ 0.25 $ 0.31 $ 0.35 $ 0.30 $ 1.44 [1] $ 1.19 [1] $ 1.30 [1]
Diluted $ 0.30 $ 0.36 $ 0.41 $ 0.37 $ 0.25 $ 0.30 $ 0.34 $ 0.30 $ 1.43 [1] $ 1.19 [1] $ 1.26 [1]
Average shares outstanding:                      
Basic 25,140,800 22,580,160 22,176,465 22,175,526 22,155,549 21,538,752 18,268,880 17,924,124 23,035,824 19,987,728 15,765,444
Diluted 25,262,010 22,715,273 22,322,390 22,326,071 22,283,722 21,651,953 18,364,167 18,012,726 23,173,626 20,082,410 16,197,312
[1] Adjusted for 3:2 stock split on November 14, 2016