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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period $ 2,601,207 $ 1,690,596 $ 1,597,703
Current period change in other comprehensive (loss) income 59,172 5,760 23,930
Balance at the end of the period 2,833,212 2,601,207 1,690,596
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period (135,355) (141,115) (165,045)
Current period change in other comprehensive (loss) income 59,172 5,760 23,930
Balance at the end of the period (76,183) (135,355) (141,115)
Unrealized Gains on Available for Sale Debt Securities      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period (144,561) (154,489)  
Current period change in other comprehensive (loss) income 67,383 9,928 32,125
Balance at the end of the period (77,178) (144,561) (154,489)
Post-Retirement Obligations      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period 6,147 3,937  
Current period change in other comprehensive (loss) income (3,293) 2,210  
Balance at the end of the period 2,854 6,147 3,937
Unrealized (Losses) on Derivatives (cash flow hedges)      
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]      
Balance at the beginning of the period 3,059 9,437  
Current period change in other comprehensive (loss) income (4,918) (6,378) (10,560)
Balance at the end of the period $ (1,859) $ 3,059 $ 9,437