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Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 121,926 $ 122,078 $ 123,955 $ 130,173 $ 133,148 $ 134,476 $ 137,862 $ 137,094 $ 498,132 $ 542,580 $ 461,854
Interest expense 13,799 15,792 18,173 23,571 24,263 25,651 25,062 23,947 71,335 98,923 65,329
Net interest income 108,127 106,286 105,782 106,602 108,885 108,825 112,800 113,147 426,797 443,657 396,525
Provision for loan losses 10,500 23,100 26,900 26,350 2,950 1,700 900 1,500 86,850 7,050 6,810
Noninterest income 62,864 70,928 64,170 37,570 37,456 37,953 41,960 35,885 235,532 153,254 143,961
Noninterest expense 122,152 116,510 118,285 115,041 95,552 96,500 93,290 88,832 471,988 374,174 345,029
Income before income taxes 38,339 37,604 24,767 2,781 47,839 48,578 60,570 58,700 103,491 215,687 188,647
Income taxes 6,818 7,612 4,637 773 9,424 11,132 13,945 13,590 19,840 48,091 41,727
Net income $ 31,521 $ 29,992 $ 20,130 $ 2,008 $ 38,415 $ 37,446 $ 46,625 $ 45,110 $ 83,651 $ 167,596 $ 146,920
Basic earnings per share (usd per share) $ 0.56 $ 0.53 $ 0.36 $ 0.04 $ 0.67 $ 0.65 $ 0.80 $ 0.77 $ 1.49 $ 2.89 $ 2.80
Diluted earnings per share (usd per share) $ 0.56 $ 0.53 $ 0.36 $ 0.04 $ 0.67 $ 0.64 $ 0.80 $ 0.77 $ 1.48 $ 2.88 $ 2.79