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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 52,217 $ 45,137 $ 43,538 $ 36,332 $ 37,774 $ 33,471 $ 28,354 $ 24,893 $ 177,224 $ 124,492 $ 98,760
Interest expense 6,421 5,625 4,981 4,513 4,230 3,053 2,447 2,404 21,540 12,134 8,109
Net interest income 45,796 39,512 38,557 31,819 33,544 30,418 25,907 22,489 155,684 112,358 90,651
Provision for loan losses 1,931 572 1,447 7,678 2,446 2,819 1,939 (511) 11,628 6,693 4,529
Net interest income after provision for loan losses 43,865 38,940 37,110 24,141 31,098 27,599 23,968 23,000 144,056 105,665 86,122
Gain on sale of subsidiary       20,860         20,860    
Other noninterest income 3,998 4,171 5,202 6,425         19,796   18,180
Total noninterest income 3,998 4,171 5,202 27,285 6,208 6,099 3,668 4,981 40,656 20,956 33,297
Noninterest expense 33,231 28,225 27,321 34,837 26,911 25,792 20,331 20,078 123,614 93,112 81,865
Operating income (loss) 14,632 14,886 14,991 16,589 10,395 7,906 7,305 7,903 61,098 33,509 37,554
Income tax expense 8,327 5,104 5,331 6,116 4,134 3,099 2,679 2,897 24,878 12,809 8,421
Net income 6,305 9,782 9,660 10,473 6,261 4,807 4,626 5,006 36,220 20,700 29,133
Dividends on preferred stock (194) (195) (193) (192) (197) (301) (195) (194) (774) (887) (780)
Net income available to common stockholders $ 6,111 $ 9,587 $ 9,467 $ 10,281 $ 6,064 $ 4,506 $ 4,431 $ 4,812 $ 35,446 $ 19,813 $ 28,353
Earnings per common share                      
Basic $ 0.29 $ 0.48 $ 0.53 $ 0.57 $ 0.34 $ 0.25 $ 0.25 $ 0.27 $ 1.85 $ 1.11 $ 1.60
Diluted $ 0.29 $ 0.47 $ 0.51 $ 0.55 $ 0.33 $ 0.25 $ 0.25 $ 0.27 $ 1.81 $ 1.10 $ 1.57