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Quarterly Financial Data -- Unaudited (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 Data [Abstract]                      
Interest income $ 36,521 $ 37,578 $ 37,571 $ 38,051 $ 35,788 $ 33,488 $ 30,131 $ 25,158      
Interest expense 5,537 6,453 6,258 5,799 4,786 3,401 2,677 1,963 $ 24,047 $ 12,827 $ 6,482
Net interest income 30,984 31,125 31,313 32,252 31,002 30,087 27,454 23,195 125,674 111,738 93,073
Provision for loan losses 2,737 2,658 91 947 3,184 2,551 1,877 1,055      
Net interest income after provision for loan losses 28,247 28,467 31,222 31,305 27,818 27,536 25,577 22,140 119,241 103,071 85,611
Other income 14,873 12,917 13,588 14,639 11,647 7,919 8,361 7,487 56,017 35,414 30,336
Other expense 27,601 25,894 30,187 28,310 26,320 24,490 20,796 18,374 111,992 89,980 74,221
Income before income taxes 15,519 15,490 14,623 17,634 13,145 10,965 13,142 11,253 63,266 48,505 41,726
Total 3,543 3,820 3,642 4,318 3,206 2,731 3,105 2,863 15,323 11,905 15,042
Net income                 47,943 36,600 26,684
Net income available to common stockholders $ 11,976 $ 11,670 $ 10,981 $ 13,316 $ 9,939 $ 8,234 $ 10,037 $ 8,390 $ 47,943 $ 36,600 $ 26,684
Basic earnings per common share $ 0.72 $ 0.70 $ 0.66 $ 0.80 $ 0.62 $ 0.54 $ 0.72 $ 0.66 $ 2.88 $ 2.53 $ 2.13
Diluted earnings per common share $ 0.72 $ 0.70 $ 0.66 $ 0.80 $ 0.62 $ 0.54 $ 0.72 $ 0.66 $ 2.87 $ 2.52 $ 2.13