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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive (Loss) Income    
Balance at the beginning of the period $ (582,536)  
Net comprehensive income (loss) (40,458) $ 63,304
Balance at the end of the period (622,994)  
Benefit Plans    
Accumulated Other Comprehensive (Loss) Income    
Balance at the beginning of the period 627 (673)
Balance at the end of the period 627 (673)
Unrealized Gains and (Losses) on Securities Available for Sale    
Accumulated Other Comprehensive (Loss) Income    
Balance at the beginning of the period (583,163) (676,415)
Other comprehensive income (loss) before reclassifications (40,458) 63,271
Amounts reclassified from accumulated other comprehensive loss   33
Net comprehensive income (loss) (40,458) 63,304
Balance at the end of the period (623,621) (613,111)
Accumulated Other Comprehensive (Loss) Income    
Accumulated Other Comprehensive (Loss) Income    
Balance at the beginning of the period (582,536) (677,088)
Other comprehensive income (loss) before reclassifications (40,458) 63,271
Amounts reclassified from accumulated other comprehensive loss   33
Net comprehensive income (loss) (40,458) 63,304
Balance at the end of the period $ (622,994) $ (613,784)