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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

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