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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, 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 | $ 37,053 | $ 36,366 | $ 35,298 | $ 34,214 | $ 33,884 | $ 33,046 | $ 32,932 | $ 32,289 | $ 142,930 | $ 132,152 | $ 127,074
Taxable equivalent adjustment | (371) | (358) | (370) | (357) | (258) | (224) | (195) | (192) |  |  |
Interest income (FTE) | 37,424 | 36,724 | 35,668 | 34,571 | 34,142 | 33,270 | 33,127 | 32,481 |  |  |
Interest expense | 4,664 | 4,340 | 4,036 | 3,767 | 3,504 | 3,268 | 3,264 | 3,169 | 16,805 | 13,207 | 11,830
Net Interest Income | 32,760 | 32,384 | 31,632 | 30,804 | 30,638 | 30,002 | 29,863 | 29,312 |  |  |
Provision for loan losses | 422 | 1,393 | 510 | 681 | 1,301 | 1,432 | 1,122 | 539 | 3,006 | 4,395 | 6,988
Investment securities gains (losses) | 200 | 0 | 0 | 4,276 | 0 | 2,668 | 845 | 0 |  |  |
Noninterest income | 15,367 | 14,611 | 14,921 | 14,231 | 14,371 | 14,079 | 13,736 | 13,127 | 63,607 | 58,825 | 67,206
Noninterest expense | 22,893 | 24,309 | 24,176 | 24,600 | 22,456 | 25,284 | 24,283 | 24,140 | 95,981 | 96,164 | 92,951
Income before income tax expense | 25,012 | 21,293 | 21,867 | 24,030 | 21,252 | 20,033 | 19,039 | 17,760 | 90,745 | 77,211 | 82,511
Income tax expense | 14,972 | 7,003 | 6,812 | 7,647 | 6,338 | 6,577 | 6,303 | 5,866 | 36,435 | 25,083 | 28,414
Interest Income Taxable Equivalent Adjustment - Tax | 371 | 358 | 370 | 357 | 258 | 224 | 195 | 192 |  |  |
Net Income Available to Common Shareholders | 9,669 | 13,932 | 14,685 | 16,026 | 14,656 | 13,232 | 12,541 | 11,702 | 54,310 | 52,128 | 54,097
Net earnings allocated to common shareholders | $ 9,560 | $ 13,778 | $ 14,531 | $ 15,849 | $ 14,479 | $ 13,075 | $ 12,391 | $ 11,571 | $ 53,719 | $ 51,505 | $ 53,484
Basic earnings per common share | $ 0.62 | $ 0.89 | $ 0.94 | $ 1.04 | $ 0.97 | $ 0.88 | $ 0.83 | $ 0.78 | $ 3.49 | $ 3.46 | $ 3.54
Diluted earnings per common share | $ 0.62 | $ 0.89 | $ 0.94 | $ 1.04 | $ 0.97 | $ 0.88 | $ 0.83 | $ 0.78 | $ 3.48 | $ 3.45 | $ 3.53
Basic | 15,472 | 15,485 | 15,462 | 15,252 | 14,894 | 14,899 | 14,889 | 14,916 | 15,412 | 14,900 | 15,123
Average shares outstanding, diluted | 15,497 | 15,505 | 15,487 | 15,277 | 14,914 | 14,909 | 14,902 | 14,927 | 15,436 | 14,913 | 15,171

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