v3.26.1
Shareholders' Equity - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 2,039,386 $ 1,824,002
Ending balance 2,022,204 1,868,073
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (54,587) (116,718)
Net change (26,995) 15,327
Ending balance (81,582) (101,391)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (62,006) (122,132)
Net change (25,081) 12,805
Ending balance (87,087) (109,327)
Unamortized Gain on Held-to-Maturity Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 5,641 8,088
Net change (593) (612)
Ending balance 5,048 7,476
Net Unrealized Gain (Loss) on Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1,778 (2,674)
Net change (1,321) 3,134
Ending balance $ 457 $ 460