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Accumulated Other Comprehensive Income (Loss) - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Provision for Income Tax $ (20,025)     $ (9,511)     $ (59,035) $ (26,731)
Net Income 62,053 $ 67,533 $ 59,949 37,840 $ 38,908 $ 34,742 189,535 111,490
Salaries and Benefits (56,447)     (51,951)     (168,859) (157,129)
Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Net Income (444)     (450)     984 (1,279)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Unrealized Gains(Losses) of Investment Securities Transferred from AFS to HTM                
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Interest Income (87)     (103)     (593) (289)
Provision for Income Tax 23     27     157 76
Net Income (64)     (76)     (436) (213)
Reclassification out of Accumulated Other Comprehensive Income | Sale of Investment Securities Available-for-Sale                
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Provision for Income Tax (22)     0     (1,014) (21)
Net Income 61     0     2,744 56
Sale of Investment Securities Available-for-Sale 83     0     3,758 77
Reclassification out of Accumulated Other Comprehensive Income | Prior Service Credit                
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Salaries and Benefits 62     62     185 185
Reclassification out of Accumulated Other Comprehensive Income | Net Actuarial Losses                
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Salaries and Benefits (662)     (571)     (1,985) (1,712)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Defined Benefit Plan Items                
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]                
Provision for Income Tax 159     135     476 405
Net Income (441)     (374)     (1,324) (1,122)
Salaries and Benefits $ (600)     $ (509)     $ (1,800) $ (1,527)