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Quarterly Condensed Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]                      
Interest income $ 64,002 $ 60,757 $ 57,879 $ 55,164 $ 54,789 $ 52,468 $ 51,542 $ 43,740 $ 237,802 $ 202,539 $ 149,224
Interest expense 13,409 12,664 10,831 8,993 7,385 6,843 5,909 5,098 45,897 25,235 13,729
Net interest income 50,593 48,093 47,048 46,171 47,404 45,625 45,633 38,642 191,905 177,304 135,495
Provision for portfolio loan losses 2,120 2,263 390 1,871 2,907 2,422 3,416 1,385 6,644 10,130 3,605
Net interest income after provision for loan losses 48,473 45,830 46,658 44,300 44,497 43,203 42,217 37,257 185,261 167,174 131,890
Noninterest income 10,702 8,410 9,693 9,542 11,112 8,372 7,934 6,976 38,347 34,394 29,059
Noninterest expense 30,747 29,922 29,219 29,143 28,260 27,404 32,651 26,736 119,031 115,051 86,110
Income before income tax expense 28,428 24,318 27,132 24,699 27,349 24,171 17,500 17,497 104,577 86,517 74,839
Income tax expense 4,899 1,802 4,881 3,778 19,820 7,856 5,545 5,106 15,360 38,327 26,002
Net income $ 23,529 $ 22,516 $ 22,251 $ 20,921 $ 7,529 $ 16,315 $ 11,955 $ 12,391 $ 89,217 $ 48,190 $ 48,837
Earnings per common share:                      
Basic (usd per share) $ 1.02 $ 0.97 $ 0.96 $ 0.91 $ 0.33 $ 0.70 $ 0.51 $ 0.57 $ 3.86 $ 2.10 $ 2.44
Diluted (usd per share) $ 1.02 $ 0.97 $ 0.95 $ 0.90 $ 0.32 $ 0.69 $ 0.50 $ 0.56 $ 3.83 $ 2.07 $ 2.41