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Comprehensive Income/(Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance beginning of period $ 1,221,939 $ 1,198,644 $ 992,125
Other comprehensive income (loss) 31,485 (2,789) 6,756
(Income) expense recognized in earnings 1,395 2,705 2,393
Balance end of period 2,496,061 1,221,939 1,198,644
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance beginning of period (52,882) (52,798) (61,947)
Balance end of period (20,002) (52,882) (52,798)
Investment Securities Available-for-Sale      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance beginning of period (53,718) (52,546) (60,193)
Other comprehensive income (loss) 33,125 (1,172) 7,647
(Income) expense recognized in earnings 0 0 0
Balance end of period (20,593) (53,718) (52,546)
Net Change in Fair Value of Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance beginning of period (1,323) (1,581) (2,242)
Other comprehensive income (loss) (20) (2,744) (2,026)
(Income) expense recognized in earnings 1,395 3,002 2,687
Balance end of period 52 (1,323) (1,581)
Postretirement Benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance beginning of period 2,159 1,329 488
Other comprehensive income (loss) (1,620) 1,127 1,135
(Income) expense recognized in earnings 0 (297) (294)
Balance end of period $ 539 $ 2,159 $ 1,329