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Accumulated Other Comprehensive Income (Loss) - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Salaries and Benefits $ (58,215) $ (65,088)
Provision for Income Tax (11,973) (15,931)
Net Income (Loss) 36,391 46,842
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Net Income (Loss) (4,727) (5,165)
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 (6,202) (6,913)
Provision for Income Tax 1,644 1,832
Net Income (Loss) (4,558) (5,081)
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 61
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) (175)
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 (230) (114)
Provision for Income Tax 61 30
Net Income (Loss) $ (169) $ (84)