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Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive (Loss) Income, Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period $ 1,690,596 $ 1,597,703 $ 1,697,096
Current period change in other comprehensive (loss) income 5,760 23,930 (171,908)
Balance at the end of the period 2,601,207 1,690,596 1,597,703
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period (141,115) (165,045) 6,863
Current period change in other comprehensive (loss) income 5,760 23,930 (171,908)
Balance at the end of the period (135,355) (141,115) (165,045)
Unrealized Losses on Available for Sale Debt Securities      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period (154,489) (186,614)  
Current period change in other comprehensive (loss) income 9,928 32,125 (186,403)
Balance at the end of the period (144,561) (154,489) (186,614)
Post-Retirement Obligations      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period 3,937 1,572  
Current period change in other comprehensive (loss) income 2,210 2,365  
Balance at the end of the period 6,147 3,937 1,572
Unrealized Gains on Derivatives (cash flow hedges)      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period 9,437 19,997  
Current period change in other comprehensive (loss) income (6,378) (10,560) 15,904
Balance at the end of the period $ 3,059 $ 9,437 $ 19,997