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Consolidated Quarterly Results of Operations (unaudited) - Summary of Consolidated Quarterly 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 Data [Abstract]                      
Interest income $ 25,444 $ 25,474 $ 25,921 $ 25,369 $ 25,903 $ 26,109 $ 25,575 $ 24,725 $ 102,208 $ 102,312 $ 74,398
Total interest expense 4,186 4,333 4,046 3,647 3,248 2,599 2,239 2,220 16,212 10,306 6,549
Net interest income 21,258 21,141 21,875 21,722 22,655 23,510 23,336 22,505 85,996 92,006 67,849
Provision for loan losses 713 1,146 765 390 1,612 786 581 964 3,014 3,943 2,317
Net interest income after provision for loan losses 20,545 19,995 21,110 21,332 21,043 22,724 22,755 21,541 82,982 88,063 65,532
Noninterest income 3,499 4,774 2,977 3,165 3,279 3,341 3,345 3,482 14,415 13,447 9,962
Noninterest expense 15,752 16,610 15,952 15,291 15,617 15,696 16,322 15,590 63,605 63,225 46,177
Income before income tax expense 8,292 8,159 8,135 9,206 8,705 10,369 9,778 9,433 33,792 38,285 29,317
Income tax expense 1,686 1,303 1,555 1,316 616 2,107 2,002 1,970 5,860 6,695 12,493
Net Income $ 6,606 $ 6,856 $ 6,580 $ 7,890 $ 8,089 $ 8,262 $ 7,776 $ 7,463 $ 27,932 $ 31,590 $ 16,824
Basic (in usd per share) $ 0.74 $ 0.76 $ 0.72 $ 0.86 $ 0.89 $ 0.91 $ 0.85 $ 0.83 $ 3.08 $ 3.48 $ 2.36
Diluted (in usd per share) $ 0.73 $ 0.75 $ 0.72 $ 0.85 $ 0.87 $ 0.89 $ 0.83 $ 0.81 $ 3.05 $ 3.40 $ 2.28