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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, 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 Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 33,884 | $ 33,046 | $ 32,932 | $ 32,289 | $ 32,222 | $ 30,768 | $ 31,720 | $ 32,364 | $ 132,152 | $ 127,074 | $ 129,566
Taxable equivalent adjustment | (258) | (224) | (195) | (192) | (179) | (147) | (144) | (142) |  |  |
Interest income (FTE) | 34,142 | 33,270 | 33,127 | 32,481 | 32,401 | 30,915 | 31,864 | 32,506 |  |  |
Interest expense | 3,504 | 3,268 | 3,264 | 3,169 | 3,010 | 2,910 | 2,937 | 2,973 | 13,207 | 11,830 | 11,960
Net Interest Income | 30,638 | 30,002 | 29,863 | 29,312 | 29,391 | 28,005 | 28,927 | 29,533 |  |  |
Provision for loan losses | 1,301 | 1,432 | 1,122 | 539 | 2,813 | 451 | 2,836 | 888 | 4,395 | 6,988 | 4,054
Investment securities gains (losses) | 0 | 2,668 | 845 | 0 | 0 | 0 | 2,116 | 14 |  |  |
Noninterest income | 14,371 | 14,079 | 13,736 | 13,127 | 14,074 | 13,706 | 13,289 | 24,007 | 58,825 | 67,206 | 58,722
Noninterest expense | 22,456 | 25,284 | 24,283 | 24,140 | 21,165 | 25,377 | 23,244 | 23,165 | 96,164 | 92,951 | 95,041
Income before income tax expense | 21,252 | 20,033 | 19,039 | 17,760 | 19,487 | 15,883 | 18,252 | 29,501 | 77,211 | 82,511 | 77,233
Income tax expense | 6,338 | 6,577 | 6,303 | 5,866 | 5,793 | 5,129 | 6,125 | 11,367 | 25,083 | 28,414 | 24,271
Interest Income Taxable Equivalent Adjustment - Tax | 258 | 224 | 195 | 192 | 179 | 147 | 144 | 142 |  |  |
Net Income Available to Common Shareholders | 14,656 | 13,232 | 12,541 | 11,702 | 13,515 | 10,607 | 11,983 | 17,992 | $ 52,128 | $ 54,097 | $ 52,962
Net earnings available to common shareholders | $ 14,479 | $ 13,075 | $ 12,391 | $ 11,571 | $ 13,362 | $ 10,487 | $ 11,849 | $ 17,783 |  |  |
Basic earnings per common share | $ 0.97 | $ 0.88 | $ 0.83 | $ 0.78 | $ 0.88 | $ 0.69 | $ 0.78 | $ 1.18 | $ 3.46 | $ 3.54 | $ 3.40
Diluted earnings per common share | $ 0.97 | $ 0.88 | $ 0.83 | $ 0.78 | $ 0.88 | $ 0.69 | $ 0.78 | $ 1.17 | $ 3.45 | $ 3.53 | $ 3.38
Basic | 14,894 | 14,899 | 14,889 | 14,916 | 15,158 | 15,178 | 15,104 | 15,067 | 14,900 | 15,123 | 15,403
Average shares outstanding, diluted | 14,914 | 14,909 | 14,902 | 14,927 | 15,175 | 15,198 | 15,127 | 15,149 | 14,913 | 15,171 | 15,488

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