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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Results Of Operations Unaudited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 105,581 |  | $ 102,360 |  | $ 96,296 |  | $ 89,049 |  | $ 86,526 |  | $ 82,370 |  | $ 79,344 |  | $ 75,794 |  | $ 75,795 |  | $ 72,431 |  | $ 69,772 |  | $ 67,807 |  | $ 393,286 | $ 324,034 | $ 285,805
Total interest expense | 23,869 |  | 21,069 |  | 18,086 |  | 13,269 |  | 11,167 |  | 10,434 |  | 9,646 |  | 8,900 |  | 8,771 |  | 7,703 |  | 5,950 |  | 5,216 |  | 76,293 | 40,147 | 27,640
Net interest income | 81,712 |  | 81,291 |  | 78,210 |  | 75,780 |  | 75,359 |  | 71,936 |  | 69,698 |  | 66,894 |  | 67,024 |  | 64,728 |  | 63,822 |  | 62,591 |  | 316,993 | 283,887 | 258,165
Provision for credit losses | 2,600 |  | 2,441 |  | 1,650 |  | 1,969 |  | 4,087 |  | 1,921 |  | 1,566 |  | 1,397 |  | 2,112 |  | 2,288 |  | 3,888 |  | 3,043 |  |  |  |
Net interest income after provision for credit losses | 79,112 |  | 78,850 |  | 76,560 |  | 73,811 |  | 71,272 |  | 70,015 |  | 68,132 |  | 65,497 |  | 64,912 |  | 62,440 |  | 59,934 |  | 59,548 |  | 308,333 | 274,916 | 246,834
Noninterest income | 6,089 |  | 5,640 |  | 5,553 |  | 5,304 |  | 9,496 |  | 6,784 |  | 7,023 |  | 6,070 |  | 7,014 |  | 6,405 |  | 7,575 |  | 6,290 |  | 22,586 | 29,372 | 27,284
Noninterest expense | 31,687 |  | 31,614 |  | 32,289 |  | 31,121 |  | 29,803 |  | 29,516 |  | 30,001 |  | 29,232 |  | 29,780 |  | 28,838 |  | 28,295 |  | 28,103 |  | 126,711 | 118,552 | 115,016
Income before income tax expense | 53,514 |  | 52,876 |  | 49,824 |  | 47,994 |  | 50,965 |  | 47,283 |  | 45,154 |  | 42,335 |  | 42,146 |  | 40,007 |  | 39,214 |  | 37,735 |  | 204,208 | 185,736 | 159,102
Income Tax Expense | 13,197 |  | 13,928 |  | 12,528 |  | 12,279 |  | 35,396 |  | 17,409 |  | 17,382 |  | 15,318 |  | 16,429 |  | 15,484 |  | 15,069 |  | 14,413 |  | 51,932 | 85,504 | 61,395
Net Income | 40,317 |  | 38,948 |  | 37,296 |  | 35,715 |  | 15,569 |  | 29,874 |  | 27,772 |  | 27,017 |  | 25,717 |  | 24,523 |  | 24,145 |  | 23,322 |  | 152,276 | 100,232 | 97,707
Preferred Stock Dividends | $ 40,317 |  | $ 38,948 |  | $ 37,296 |  | $ 35,715 |  | $ 15,569 |  | $ 29,874 |  | $ 27,772 |  | $ 27,017 |  | $ 25,717 |  | $ 24,523 |  | $ 24,145 |  | $ 23,322 |  |  |  |
Net income available to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 152,276 | $ 100,232 | $ 97,707
Earnings Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.17 | [1] | $ 1.14 | [1] | $ 1.09 | [1] | $ 1.04 | [1] | $ 0.46 | [1] | $ 0.87 | [1] | $ 0.81 | [1] | $ 0.79 | [1] | $ 0.76 | [1] | $ 0.73 | [1] | $ 0.72 | [1] | $ 0.7 | [1] | $ 4.44 | $ 2.94 | $ 2.91
Diluted (in dollars per share) | $ 1.17 | [1] | $ 1.13 | [1] | $ 1.08 | [1] | $ 1.04 | [1] | $ 0.45 | [1] | $ 0.87 | [1] | $ 0.81 | [1] | $ 0.79 | [1] | $ 0.75 | [1] | $ 0.72 | [1] | $ 0.71 | [1] | $ 0.68 | [1] | $ 4.42 | $ 2.92 | $ 2.86
[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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