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Condensed Financial Information (Parent Company Only) - Condensed Statements of 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
Operating Income (Expense)                      
Other income                 $ 4,242 $ 1,513 $ 2,394
Interest expense $ (4,142) $ (4,324) $ (4,788) $ (5,051) $ (9,612) $ (6,749) $ (7,348) $ (10,729) (18,305) (34,438) (47,541)
Employee benefit expense                 (74,051) (71,082) (65,206)
Income Before Tax                 102,447 78,369 79,841
Income Tax Benefit                 (15,356) (9,870) (13,303)
Net Income Available to Common Shareholders                 87,091 68,499 66,538
Parent Company                      
Operating Income (Expense)                      
Dividend income from subsidiaries                 22,500 61,400 46,150
Other income                 25 106 0
Interest expense                 (5,767) (4,483) (3,209)
Employee benefit expense                 (1,890) (1,997) (1,687)
Other expense                 (591) (517) (416)
Income Before Undistributed Income of Subsidiaries                 14,277 54,509 40,838
Undistributed Income of Subsidiaries                 71,439 13,131 25,053
Income Before Tax                 85,716 67,640 65,891
Income Tax Benefit                 1,375 859 647
Net Income Available to Common Shareholders                 $ 87,091 $ 68,499 $ 66,538