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Accumulated Other Comprehensive Income (Loss) - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and Benefits $ (57,769)   $ (56,161)   $ (117,693) $ (112,412)
Provision for Income Tax (17,759)   (19,985)   (33,365) (39,010)
Net Income 56,862 $ 54,834 67,533 $ 59,949 111,696 127,482
Reclassification out of Accumulated Other Comprehensive Income            
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]            
Net Income (350)   1,962   (752) 1,428
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 3   (380)   (63) (506)
Provision for Income Tax (1)   101   16 134
Net Income 2   (279)   (47) (372)
Reclassification out of Accumulated Other Comprehensive Income | Sale of Investment Securities Available-for-Sale            
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]            
Sale of Investment Securities Available-for-Sale 0   3,675   0 3,675
Provision for Income Tax 0   (992)   0 (992)
Net Income 0   2,683   0 2,683
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent            
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and Benefits 61   62   123 123
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent            
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and Benefits (542)   (661)   (1,084) (1,323)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Attributable to Parent            
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]            
Salaries and Benefits (481)   (599)   (961) (1,200)
Provision for Income Tax 129   157   256 317
Net Income $ (352)   $ (442)   $ (705) $ (883)