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Summarized Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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 Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 48,548 | $ 49,981 | $ 50,238 | $ 48,933 | $ 44,348 | $ 42,729 | $ 39,180 | $ 37,644 | $ 197,700 | $ 163,901 | $ 142,930
Taxable equivalent adjustment | 189 | 192 | 202 | 208 | 194 | 187 | 187 | 187 |  |  |
Interest income (FTE) | 48,737 | 50,173 | 50,440 | 49,141 | 44,542 | 42,916 | 39,367 | 37,831 |  |  |
Interest expense | 8,701 | 9,444 | 9,327 | 8,867 | 7,917 | 7,171 | 5,607 | 4,997 | 36,339 | 25,692 | 16,805
Net Interest Income | 40,036 | 40,729 | 41,113 | 40,274 | 36,625 | 35,745 | 33,760 | 32,834 |  |  |
(Recovery of) provision for loan losses | (75) | 274 | (600) | (849) | (400) | (27) | (2,064) | 181 | (1,250) | (2,310) | 3,006
Noninterest income | 18,042 | 16,698 | 17,825 | 15,925 | 14,706 | 15,753 | 15,611 | 14,492 | 68,490 | 60,564 | 63,607
Noninterest expense | 29,034 | 28,397 | 30,772 | 29,411 | 38,178 | 25,040 | 24,911 | 24,937 | 117,614 | 113,066 | 95,981
Income before income tax expense | 29,119 | 28,756 | 28,766 | 27,637 | 13,553 | 26,485 | 26,524 | 22,208 | 113,487 | 88,017 | 90,745
Income tax expense | 6,319 | 6,193 | 5,813 | 5,810 | 2,646 | 5,606 | 5,358 | 4,405 | 24,135 | 18,015 | 36,435
Interest Income Taxable Equivalent Adjustment - Tax | (189) | (192) | (202) | (208) | (194) | (187) | (187) | (187) |  |  |
Net Income Available to Common Shareholders | 22,611 | 22,371 | 22,751 | 21,619 | 10,713 | 20,692 | 20,979 | 17,616 | 89,352 | 70,002 | 54,310
Net earnings allocated to common shareholders | $ 22,409 | $ 22,179 | $ 22,554 | $ 21,433 | $ 10,623 | $ 20,491 | $ 20,768 | $ 17,421 | $ 88,546 | $ 69,348 | $ 53,719
Basic earnings per common share | $ 1.38 | $ 1.36 | $ 1.38 | $ 1.31 | $ 0.68 | $ 1.34 | $ 1.36 | $ 1.13 | $ 5.43 | $ 4.50 | $ 3.49
Diluted earnings per common share | $ 1.38 | $ 1.36 | $ 1.38 | $ 1.30 | $ 0.68 | $ 1.33 | $ 1.35 | $ 1.13 | $ 5.42 | $ 4.49 | $ 3.48
Basic | 16,207 | 16,271 | 16,368 | 16,411 | 15,603 | 15,340 | 15,326 | 15,414 | 16,314 | 15,421 | 15,412
Average shares outstanding, diluted | 16,230 | 16,289 | 16,386 | 16,429 | 15,618 | 15,358 | 15,345 | 15,436 | 16,333 | 15,439 | 15,436

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