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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.