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Quarterly Financial Data (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 75,850 $ 71,759 $ 61,249 $ 54,118 $ 52,217 $ 45,137 $ 43,538 $ 36,332 $ 262,976 $ 177,224 $ 124,492
Interest expense 10,969 9,977 7,992 6,988 6,421 5,625 4,981 4,513 35,926 21,540 12,134
Net interest income 64,881 61,782 53,257 47,130 45,796 39,512 38,557 31,819 227,050 155,684 112,358
Provision for loan losses 1,910 6,803 4,906 2,548 1,931 572 1,447 7,678 16,167 11,628 6,693
Net interest income after provision for loan losses 62,971 54,979 48,351 44,582 43,865 38,940 37,110 24,141 210,883 144,056 105,665
Gain on sale of subsidiary       1,071       20,860 1,071 20,860  
Other noninterest income 6,794 6,059 4,945 4,101 3,998 4,171 5,202 6,425 21,899 19,796  
Total noninterest income 6,794 6,059 4,945 5,172 3,998 4,171 5,202 27,285 22,970 40,656 20,956
Noninterest expense 46,962 48,946 37,403 34,042 33,231 28,225 27,321 34,837 167,353 123,614 93,112
Net income before income tax expense 22,803 12,092 15,893 15,712 14,632 14,886 14,991 16,589 66,500 61,098 33,509
Income tax expense 4,718 2,922 3,508 3,644 8,327 5,104 5,331 6,116 14,792 24,878 12,809
Net income 18,085 9,170 12,385 12,068 6,305 9,782 9,660 10,473 51,708 36,220 20,700
Dividends on preferred stock   (195) (193) (190) (194) (195) (193) (192) (578) (774) (887)
Net income available to common stockholders $ 18,085 $ 8,975 $ 12,192 $ 11,878 $ 6,111 $ 9,587 $ 9,467 $ 10,281 $ 51,130 $ 35,446 $ 19,813
Earnings per common share                      
Basic $ 0.68 $ 0.34 $ 0.48 $ 0.57 $ 0.29 $ 0.48 $ 0.53 $ 0.57 $ 2.06 $ 1.85 $ 1.11
Diluted $ 0.67 $ 0.34 $ 0.47 $ 0.56 $ 0.29 $ 0.47 $ 0.51 $ 0.55 $ 2.03 $ 1.81 $ 1.10