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Quarterly Financial Data -- Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 23,011 | $ 18,623 | $ 16,883 | $ 16,979 | $ 16,697 | $ 14,943 | $ 14,172 | $ 13,439 |  |  |
Interest expense | 1,487 | 1,000 | 913 | 892 | 897 | 947 | 828 | 827 | $ 4,292 | $ 3,499 | $ 3,252
Net interest income | 21,524 | 17,623 | 15,970 | 16,087 | 15,800 | 13,996 | 13,344 | 12,612 | 71,204 | 55,752 | 51,482
Provision for loan losses | 899 | 1,081 | 733 | 113 | 429 | 481 | 143 | 265 |  |  |
Net interest income after provision for loan losses | 20,625 | 16,542 | 15,237 | 15,974 | 15,371 | 13,515 | 13,201 | 12,347 | 68,378 | 54,434 | 50,853
Other income | 6,911 | 6,898 | 6,459 | 6,644 | 6,199 | 5,009 | 4,537 | 4,799 | 26,912 | 20,544 | 18,369
Other expense | 16,876 | 15,320 | 14,143 | 15,171 | 14,332 | 12,882 | 11,230 | 10,804 | 61,510 | 49,248 | 44,507
Income before income taxes | 10,660 | 8,120 | 7,553 | 7,447 | 7,238 | 5,642 | 6,508 | 6,342 | 33,780 | 25,730 | 24,715
Total | 3,863 | 2,812 | 2,624 | 2,641 | 2,584 | 1,979 | 2,352 | 2,303 | 11,940 | 9,218 | 9,254
Net income | 6,797 | 5,308 | 4,929 | 4,806 | 4,654 | 3,663 | 4,156 | 4,039 | 21,840 | 16,512 | 15,461
Dividends on preferred shares | 0 | 0 | 275 | 550 | 550 | 550 | 550 | 550 | 825 | 2,200 | 4,152
Net income available to common stockholders | $ 6,797 | $ 5,308 | $ 4,654 | $ 4,256 | $ 4,104 | $ 3,113 | $ 3,606 | $ 3,489 | $ 21,015 | $ 14,312 | $ 11,309
Basic earnings per common share | $ 0.55 | $ 0.51 | $ 0.51 | $ 0.50 | $ 0.49 | $ 0.37 | $ 0.50 | $ 0.50 | $ 2.07 | $ 1.84 | $ 1.88
Diluted earnings per common share | $ 0.55 | $ 0.51 | $ 0.50 | $ 0.49 | $ 0.48 | $ 0.37 | $ 0.49 | $ 0.48 | $ 2.05 | $ 1.81 | $ 1.85

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