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Quarterly Condensed Financial Information (Details) - 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 income $ 84,113 $ 70,787 $ 73,191 $ 76,688 $ 77,238 $ 81,078 $ 79,201 $ 67,617 $ 304,779 $ 305,134 $ 237,802
Interest expense 6,667 7,433 7,358 13,320 15,625 18,032 17,486 15,274 34,778 66,417 45,897
Net interest income 77,446 63,354 65,833 63,368 61,613 63,046 61,715 52,343 270,001 238,717 191,905
Provision for credit losses 9,463 14,080 19,591 22,264 1,341 1,833 1,722 1,476 65,398 6,372 6,644
Net interest income after provision for loan losses 67,983 49,274 46,242 41,104 60,272 61,213 59,993 50,867 204,603 232,345 185,261
Noninterest income 18,506 12,629 9,960 13,408 14,418 13,564 11,964 9,230 54,503 49,176 38,347
Noninterest expense 51,050 39,524 37,912 38,673 38,354 38,239 49,054 39,838 167,159 165,485 119,031
Income before income tax expense 35,439 22,379 18,290 15,839 36,336 36,538 22,903 20,259 91,947 116,036 104,577
Income tax expense 6,508 4,428 3,656 2,971 7,246 7,469 4,479 4,103 17,563 23,297 15,360
Net income $ 28,931 $ 17,951 $ 14,634 $ 12,868 $ 29,090 $ 29,069 $ 18,424 $ 16,156 $ 74,384 $ 92,739 $ 89,217
Earnings per common share:                      
Basic (usd per share) $ 1.00 $ 0.68 $ 0.56 $ 0.49 $ 1.10 $ 1.09 $ 0.69 $ 0.68 $ 2.76 $ 3.56 $ 3.86
Diluted (usd per share) $ 1.00 $ 0.68 $ 0.56 $ 0.48 $ 1.09 $ 1.08 $ 0.68 $ 0.67 $ 2.76 $ 3.55 $ 3.83