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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Results Of Operations Details |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 86,526 |  | $ 82,370 |  | $ 79,344 |  | $ 75,794 |  | $ 75,795 |  | $ 72,431 |  | $ 69,772 |  | $ 67,807 |  | $ 67,311 |  | $ 63,981 |  | $ 62,423 |  | $ 59,465 |  | $ 324,034 | $ 285,805 | $ 253,180
Total interest expense | 11,167 |  | 10,434 |  | 9,646 |  | 8,900 |  | 8,771 |  | 7,703 |  | 5,950 |  | 5,216 |  | 4,735 |  | 4,896 |  | 4,873 |  | 4,734 |  | 40,147 | 27,640 | 19,238
Net interest income | 75,359 |  | 71,936 |  | 69,698 |  | 66,894 |  | 67,024 |  | 64,728 |  | 63,822 |  | 62,591 |  | 62,576 |  | 59,085 |  | 57,550 |  | 54,731 |  | 283,887 | 258,165 | 233,942
Provision for credit losses | 4,087 |  | 1,921 |  | 1,566 |  | 1,397 |  | 2,112 |  | 2,288 |  | 3,888 |  | 3,043 |  | 4,595 |  | 3,262 |  | 3,471 |  | 3,310 |  |  |  |
Net interest income after provision for credit losses | 71,272 |  | 70,015 |  | 68,132 |  | 65,497 |  | 64,912 |  | 62,440 |  | 59,934 |  | 59,548 |  | 57,981 |  | 55,823 |  | 54,079 |  | 51,421 |  | 274,916 | 246,834 | 219,304
Noninterest income | 9,496 |  | 6,784 |  | 7,023 |  | 6,070 |  | 7,014 |  | 6,405 |  | 7,575 |  | 6,290 |  | 6,492 |  | 6,099 |  | 6,233 |  | 7,804 |  | 29,372 | 27,284 | 26,628
Noninterest expense | 29,803 |  | 29,516 |  | 30,001 |  | 29,232 |  | 29,780 |  | 28,838 |  | 28,295 |  | 28,103 |  | 28,640 |  | 27,405 |  | 26,598 |  | 28,073 |  | 118,552 | 115,016 | 110,716
Income before income tax expense | 50,965 |  | 47,283 |  | 45,154 |  | 42,335 |  | 42,146 |  | 40,007 |  | 39,214 |  | 37,735 |  | 35,833 |  | 34,517 |  | 33,714 |  | 31,152 |  | 185,736 | 159,102 | 135,216
Income Tax Expense | 35,396 |  | 17,409 |  | 17,382 |  | 15,318 |  | 16,429 |  | 15,484 |  | 15,069 |  | 14,413 |  | 13,485 |  | 13,054 |  | 12,776 |  | 11,734 |  | 85,504 | 61,395 | 51,049
Net Income | 15,569 |  | 29,874 |  | 27,772 |  | 27,017 |  | 25,717 |  | 24,523 |  | 24,145 |  | 23,322 |  | 22,348 |  | 21,463 |  | 20,938 |  | 19,418 |  | 100,232 | 97,707 | 84,167
Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 |  | 179 |  | 180 |  |  |  | 601
Net income available to common shareholders | $ 15,569 |  | $ 29,874 |  | $ 27,772 |  | $ 27,017 |  | $ 25,717 |  | $ 24,523 |  | $ 24,145 |  | $ 23,322 |  | $ 22,286 |  | $ 21,283 |  | $ 20,759 |  | $ 19,238 |  | $ 100,232 | $ 97,707 | $ 83,566
Earnings Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.46 | [1] | $ 0.87 | [1] | $ 0.81 | [1] | $ 0.79 | [1] | $ 0.76 | [1] | $ 0.73 | [1] | $ 0.72 | [1] | $ 0.70 | [1] | $ 0.67 | [1] | $ 0.64 | [1] | $ 0.62 | [1] | $ 0.62 | [1] | $ 2.94 | $ 2.91 | $ 2.54
Diluted (in dollars per share) | $ 0.45 | [1] | $ 0.87 | [1] | $ 0.81 | [1] | $ 0.79 | [1] | $ 0.75 | [1] | $ 0.72 | [1] | $ 0.71 | [1] | $ 0.68 | [1] | $ 0.65 | [1] | $ 0.63 | [1] | $ 0.61 | [1] | $ 0.61 | [1] | $ 2.92 | $ 2.86 | $ 2.50
[1] | Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.

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