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Shareholders' Equity and Compensation Plans - Changes in OCI (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]      
Beginning balance $ 1,824,002 $ 1,716,068 $ 1,522,263
Net change 62,131 (15,703) 29,317
Ending balance 2,039,386 1,824,002 1,716,068
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (116,718) (101,015) (130,332)
Ending balance (54,587) (116,718) (101,015)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (122,132) (112,844) (144,549)
Net change 60,126 (9,288) 31,705
Ending balance (62,006) (122,132) (112,844)
Unamortized Gain (Loss) on Held-to-Maturity Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 8,088 10,580 13,185
Net change (2,447) (2,492) (2,605)
Ending balance 5,641 8,088 10,580
Net Unrealized Gain (Loss) on Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2,674) 1,249 1,032
Net change 4,452 (3,923) 217
Ending balance $ 1,778 $ (2,674) $ 1,249