v3.26.3
Shareholders' Equity - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 2,040,846 $ 1,922,899 $ 2,039,386 $ 1,824,002
Ending balance 1,917,326 1,982,332 1,917,326 1,982,332
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (73,710) (88,985) (54,587) (116,718)
Net change (123,122) 20,965 (142,245) 48,698
Ending balance (196,832) (68,020) (196,832) (68,020)
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (75,355) (97,979) (62,006) (122,132)
Net change (112,343) 21,677 (125,692) 45,830
Ending balance (187,698) (76,302) (187,698) (76,302)
Unamortized Gain on Held-to-Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 4,524 6,869 5,641 8,088
Net change (530) (636) (1,647) (1,855)
Ending balance 3,994 6,233 3,994 6,233
Net Unrealized Gain (Loss) on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (2,879) 2,125 1,778 (2,674)
Net change (10,249) (76) (14,906) 4,723
Ending balance $ (13,128) $ 2,049 $ (13,128) $ 2,049