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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 53,398 $ 55,711 $ 53,850 $ 45,373 $ 43,730 $ 42,271 $ 40,741 $ 39,426 $ 208,332 $ 166,168 $ 128,483
Interest expense 11,879 12,248 12,321 11,093 9,894 8,499 7,191 6,015 47,541 31,599 16,383
Net interest income 41,519 43,463 41,529 34,280 33,836 33,772 33,550 33,411 160,791 134,569 112,100
Provision for loan losses 340 376 896 364 528 1,176 635 567 1,976 2,906 2,470
Gain (loss) on sale of securities 10   (100) 15 (332) (122)   11 (75) (443) 38
Net income $ 18,543 $ 20,537 $ 16,642 $ 10,816 $ 13,133 $ 13,065 $ 14,115 $ 12,804 $ 66,538 $ 53,117 $ 33,117
Earnings per share:                      
Basic $ 0.41 $ 0.46 $ 0.37 $ 0.28 $ 0.35 $ 0.34 $ 0.37 $ 0.33 $ 1.53 $ 1.39 $ 0.96
Diluted $ 0.41 $ 0.46 $ 0.37 $ 0.28 $ 0.34 $ 0.34 $ 0.37 $ 0.33 $ 1.53 $ 1.38 $ 0.95
Average shares outstanding:                      
Basic 44,971,676 45,038,021 45,055,117 38,822,543 38,367,972 38,365,379 38,347,612 38,306,395 43,493,316 38,347,059 34,553,736
Diluted 45,103,065 45,113,730 45,130,408 38,906,172 38,488,861 38,534,970 38,519,401 38,468,810 43,597,595 38,495,231 34,760,438