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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period     $ (677,088)  
Net comprehensive (loss) income $ (48,614) $ (196,928) 14,690 $ (469,738)
Balance at the end of the period (662,398)   (662,398)  
Benefit Plans        
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period (673) 57 (673) 57
Balance at the end of the period (673) 57 (673) 57
Unrealized Gains and (Losses) on Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period (613,111) (294,013) (676,415) (21,203)
Other comprehensive income (loss) before reclassifications (48,614) (196,928) 14,723 (469,738)
Amounts reclassified from accumulated other comprehensive loss     (33)  
Net comprehensive (loss) income (48,614) (196,928) 14,690 (469,738)
Balance at the end of the period (661,725) (490,941) (661,725) (490,941)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss)        
Balance at the beginning of the period (613,784) (293,956) (677,088) (21,146)
Other comprehensive income (loss) before reclassifications (48,614) (196,928) 14,723 (469,738)
Amounts reclassified from accumulated other comprehensive loss     (33)  
Net comprehensive (loss) income (48,614) (196,928) 14,690 (469,738)
Balance at the end of the period $ (662,398) $ (490,884) $ (662,398) $ (490,884)