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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Salaries and Benefits $ (58,626) $ (58,825) $ (173,874) $ (180,088)
Provision for Income Tax (12,278) (15,767) (35,475) (46,704)
Net Income (Loss) 40,358 47,903 110,832 140,806
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Net Income (Loss) (4,730) (8,416) (14,250) (18,663)
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 (6,207) (6,787) (18,703) (20,500)
Provision for Income Tax 1,645 1,800 4,958 5,434
Net Income (Loss) (4,562) (4,987) (13,745) (15,066)
Reclassification out of Accumulated Other Comprehensive Income | Sale of Investment Securities Available for Sale Member        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Sale of Investment Securities Available-for-Sale   (4,582)   (4,582)
Provision for Income Tax   1,237   1,237
Net Income (Loss)   (3,345)   (3,345)
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 62 62 184 184
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 (291) (177) (873) (528)
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 (229) (115) (689) (344)
Provision for Income Tax 61 31 184 92
Net Income (Loss) $ (168) $ (84) $ (505) $ (252)