v3.26.1
Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance $ 2,129,145 $ 2,021,227 $ 2,121,677 $ 1,962,327
Other comprehensive income (loss) before reclassification     (30,057) 49,082
Amounts reclassified from accumulated other comprehensive income (loss)     1,400 4,088
Other comprehensive income (loss), net of tax amount (14,846) 18,213 (28,657) 53,170
Balance 2,143,631 2,070,789 2,143,631 2,070,789
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     (19,621) 40,099
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Other comprehensive income (loss), net of tax amount     (19,621) 40,099
Balance (30,139) (26,786) (30,139) (26,786)
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)     95 67
Other comprehensive income (loss), net of tax amount     95 67
Balance (5,074) (4,654) (5,074) (4,654)
Cash Flow Hedge Derivatives [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     2,062 (12,053)
Other comprehensive income (loss) before reclassification     (10,436) 8,983
Amounts reclassified from accumulated other comprehensive income (loss)     1,305 4,021
Other comprehensive income (loss), net of tax amount     (9,131) 13,004
Balance (7,069) 951 (7,069) 951
Accumulated Other Comprehensive (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (27,436) (48,702) (13,625) (83,659)
Balance $ (42,282) $ (30,489) $ (42,282) $ (30,489)