Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Detail)

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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Interest and dividend income $ 54,359 $ 54,846 $ 55,736 $ 58,925 $ 60,699 $ 62,177 $ 61,482 $ 62,414 $ 223,866 $ 246,772 $ 234,397
Interest expense 7,482 9,241 11,294 14,950 16,763 18,119 18,492 17,526 42,968 70,900 53,384
Net interest income before credit loss expense 46,877 45,605 44,442 43,975 43,936 44,058 42,990 44,888 180,898 175,872 181,013
Credit loss expense 5,083 38 24,594 15,739 10,752 1,602 16,699 1,117 45,454 30,170 3,990
Noninterest income 8,809 7,140 20,931 6,223 6,709 6,860 7,729 6,254 43,104 27,552 24,520
Noninterest expense 30,923 29,924 27,138 31,068 34,089 32,607 30,144 29,065 119,053 125,906 117,573
Income before tax 19,680 22,783 13,641 3,391 5,804 16,709 3,876 20,960      
Income tax expense 5,354 6,439 4,466 1,041 2,720 4,333 1,220 6,288 17,299 14,560 26,102
Net income $ 14,326 $ 16,344 $ 9,175 $ 2,350 $ 3,084 $ 12,377 $ 2,656 $ 14,672 $ 42,196 $ 32,788 $ 57,868
Basic earnings per share $ 0.47 $ 0.53 $ 0.30 $ 0.08 $ 0.10 $ 0.40 $ 0.09 $ 0.48 $ 1.38 $ 1.06 $ 1.80
Diluted earnings per share $ 0.47 $ 0.53 $ 0.30 $ 0.08 $ 0.10 $ 0.40 $ 0.09 $ 0.48 $ 1.38 $ 1.06 $ 1.79