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Quarterly Condensed Financial Information (Details) - 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 $ 77,238 $ 81,078 $ 79,201 $ 67,617 $ 64,002 $ 60,757 $ 57,879 $ 55,164 $ 305,134 $ 237,802 $ 202,539
Interest expense 15,625 18,032 17,486 15,274 13,409 12,664 10,831 8,993 66,417 45,897 25,235
Net interest income 61,613 63,046 61,715 52,343 50,593 48,093 47,048 46,171 238,717 191,905 177,304
Provision for portfolio loan losses 1,341 1,833 1,722 1,476 2,120 2,263 390 1,871 6,372 6,644 10,130
Net interest income after provision for loan losses 60,272 61,213 59,993 50,867 48,473 45,830 46,658 44,300 232,345 185,261 167,174
Noninterest income 14,418 13,564 11,964 9,230 10,702 8,410 9,693 9,542 49,176 38,347 34,394
Noninterest expense 38,354 38,239 49,054 39,838 30,747 29,922 29,219 29,143 165,485 119,031 115,051
Income before income tax expense 36,336 36,538 22,903 20,259 28,428 24,318 27,132 24,699 116,036 104,577 86,517
Income tax expense 7,246 7,469 4,479 4,103 4,899 1,802 4,881 3,778 23,297 15,360 38,327
Net income $ 29,090 $ 29,069 $ 18,424 $ 16,156 $ 23,529 $ 22,516 $ 22,251 $ 20,921 $ 92,739 $ 89,217 $ 48,190
Earnings per common share:                      
Basic (usd per share) $ 1.10 $ 1.09 $ 0.69 $ 0.68 $ 1.02 $ 0.97 $ 0.96 $ 0.91 $ 3.56 $ 3.86 $ 2.10
Diluted (usd per share) $ 1.09 $ 1.08 $ 0.68 $ 0.67 $ 1.02 $ 0.97 $ 0.95 $ 0.90 $ 3.55 $ 3.83 $ 2.07