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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
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, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Results Of Operations Unaudited                              
Total interest income $ 107,183 $ 109,034 $ 108,279 $ 105,134 $ 105,581 $ 102,360 $ 96,296 $ 89,049 $ 86,526 $ 82,370 $ 79,344 $ 75,794 $ 429,630 $ 393,286 $ 324,034
Total interest expense 26,473 28,045 26,950 24,117 23,869 21,069 18,086 13,269 11,167 10,434 9,646 8,900 105,585 76,293 40,147
Net interest income 80,710 80,989 81,329 81,017 81,712 81,291 78,210 75,780 75,359 71,936 69,698 66,894 324,045 316,993 283,887
Provision for credit losses 2,945 3,186 3,600 3,360 2,600 2,441 1,650 1,969 4,087 1,921 1,566 1,397      
Net interest income after provision for credit losses 77,765 77,803 77,729 77,657 79,112 78,850 76,560 73,811 71,272 70,015 68,132 65,497 310,954 308,333 274,916
Noninterest income 6,734 6,314 6,360 6,291 6,089 5,640 5,553 5,304 9,496 6,784 7,023 6,070 25,699 22,586 29,372
Noninterest expense 34,726 33,473 33,359 38,304 31,687 31,614 32,289 31,121 29,803 29,516 30,001 29,232 139,862 126,711 118,552
Income before income tax expense 49,773 50,644 50,730 45,644 53,514 52,876 49,824 47,994 50,965 47,283 45,154 42,335 196,791 204,208 185,736
Income Tax Expense 14,317 14,149 13,487 11,895 13,197 13,928 12,528 12,279 35,396 17,409 17,382 15,318 53,848 51,932 85,504
Net Income 35,456 36,495 37,243 33,749 40,317 38,948 37,296 35,715 15,569 29,874 27,772 27,017 142,943 152,276 100,232
Net Income Available to Common Shareholders $ 35,456 $ 36,495 $ 37,243 $ 33,749 $ 40,317 $ 38,948 $ 37,296 $ 35,715 $ 15,569 $ 29,874 $ 27,772 $ 27,017 $ 142,943 $ 152,276 $ 100,232
Net Income per Common Share                              
Basic (in dollars per share) $ 1.06 $ 1.07 $ 1.08 $ 0.98 $ 1.17 $ 1.14 $ 1.09 $ 1.04 $ 0.46 $ 0.87 $ 0.81 $ 0.79 $ 4.18 $ 4.44 $ 2.94
Diluted (in dollars per share) $ 1.06 $ 1.07 $ 1.08 $ 0.98 $ 1.17 $ 1.13 $ 1.08 $ 1.04 $ 0.45 $ 0.87 $ 0.81 $ 0.79 $ 4.18 $ 4.42 $ 2.92