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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 43,730 $ 42,271 $ 40,741 $ 39,426 $ 36,774 $ 32,070 $ 30,805 $ 28,834 $ 166,168 $ 128,483 $ 106,529
Interest expense 9,894 8,499 7,191 6,015 5,319 4,191 3,607 3,266 31,599 16,383 20,537
Net interest income 33,836 33,772 33,550 33,411 31,455 27,879 27,198 25,568 134,569 112,100 85,992
Provision for loan losses 528 1,176 635 567 1,100 710 330 330 2,906 2,470 1,842
Gain (loss) on sale of securities (332) (122)   11   6 (3) 35 (443) 38 1,836
Net income $ 13,133 $ 13,065 $ 14,115 $ 12,804 $ 7,650 $ 8,171 $ 9,072 $ 8,224 $ 53,117 $ 33,117 $ 23,912
Earnings per share:                      
Basic $ 0.35 $ 0.34 $ 0.37 $ 0.33 $ 0.20 $ 0.24 $ 0.27 $ 0.25 $ 1.39 $ 0.96 $ 0.80
Diluted $ 0.34 $ 0.34 $ 0.37 $ 0.33 $ 0.20 $ 0.24 $ 0.27 $ 0.25 $ 1.38 $ 0.95 $ 0.79
Average shares outstanding:                      
Basic 38,367,972 38,365,379 38,347,612 38,306,395 37,711,200 33,870,240 33,264,697 33,263,289 38,347,059 34,553,736 29,981,592
Diluted 38,488,861 38,534,970 38,519,401 38,468,810 37,893,014 34,072,909 33,483,584 33,489,106 38,495,231 34,760,438 30,123,614