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Parent Holding Company Information (Condensed) - Condensed Statements of Operations and Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expenses                      
Compensation and employee benefits                 $ 270,644 $ 253,047 $ 222,753
Other operating expenses                 70,609 66,809 62,775
Total non-interest expense $ 134,047 $ 104,108 $ 100,082 $ 96,585 $ 111,187 $ 103,373 $ 94,764 $ 95,487 434,822 404,811 374,927
Income tax benefit (9,272) (16,976) (18,935) (19,498) (18,950) (18,754) (14,306) (9,630) (64,681) (61,640) (48,650)
Net Income $ 50,709 $ 75,619 $ 77,627 $ 80,802 $ 81,860 $ 77,757 $ 63,444 $ 43,339 284,757 266,400 210,544
Comprehensive Income                 169,026 369,264 260,197
Parent Company                      
Income                      
Dividends from subsidiaries                 207,000 188,000 142,000
Intercompany charges for services                 2,654 2,332 20,661
Other income                 500 954 513
Total income                 210,154 191,286 163,174
Expenses                      
Compensation and employee benefits                 6,516 5,646 25,806
Other operating expenses                 13,624 10,051 15,118
Total non-interest expense                 20,140 15,697 40,924
Income before income tax benefit and equity in undistributed net income of subsidiaries                 190,014 175,589 122,250
Income tax benefit                 3,407 3,108 4,488
Income before equity in undistributed net income of subsidiaries                 193,421 178,697 126,738
Equity in undistributed net income of subsidiaries                 91,336 87,703 83,806
Net Income                 284,757 266,400 210,544
Comprehensive Income                 $ 169,026 $ 369,264 $ 260,197