v3.26.1
Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 2,121,677 $ 1,962,327
Other comprehensive income (loss) before reclassification (14,576) 32,928
Amounts reclassified from accumulated other comprehensive income (loss) 765 2,029
Other comprehensive income (loss), net of tax amount (13,811) 34,957
Balance 2,129,145 2,021,227
Securities Available for Sale and Transferred Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (10,518) (66,885)
Other comprehensive income (loss) before reclassification (10,296) 27,019
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Other comprehensive income (loss), net of tax amount (10,296) 27,019
Balance (20,814) (39,866)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (5,169) (4,721)
Other comprehensive income (loss) before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 64 19
Other comprehensive income (loss), net of tax amount 64 19
Balance (5,105) (4,702)
Cash Flow Hedge Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 2,062 (12,053)
Other comprehensive income (loss) before reclassification (4,280) 5,909
Amounts reclassified from accumulated other comprehensive income (loss) 701 2,010
Other comprehensive income (loss), net of tax amount (3,579) 7,919
Balance (1,517) (4,134)
Accumulated Other Comprehensive (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (13,625) (83,659)
Balance $ (27,436) $ (48,702)