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Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 3,884,905 $ 2,678,318
Ending balance 3,866,918 2,727,105
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (89,732) (142,608)
Other comprehensive income (loss) before reclassification (14,077) 27,125
Amounts reclassified from accumulated other comprehensive income 822 929
Tax expense (benefit) 3,363 (7,067)
Other comprehensive (loss) income, net of tax (9,892) 20,987
Ending balance (99,624) (121,621)
Unrealized Holding Gains (Losses) on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (56,542) (103,889)
Other comprehensive income (loss) before reclassification (15,891) 26,688
Amounts reclassified from accumulated other comprehensive income 0 0
Tax expense (benefit) 4,024 (6,718)
Other comprehensive (loss) income, net of tax (11,867) 19,970
Ending balance (68,409) (83,919)
Amortization of unrealized holding losses on securities transferred to held to maturity    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (40,435) (49,045)
Other comprehensive income (loss) before reclassification 2,625 3,044
Amounts reclassified from accumulated other comprehensive income 0 0
Tax expense (benefit) (672) (779)
Other comprehensive (loss) income, net of tax 1,953 2,265
Ending balance (38,482) (46,780)
Unrealized Gains (Losses) on Derivative Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 13,598 17,429
Other comprehensive income (loss) before reclassification (885) (2,706)
Amounts reclassified from accumulated other comprehensive income 841 929
Tax expense (benefit) 11 455
Other comprehensive (loss) income, net of tax (33) (1,322)
Ending balance 13,565 16,107
Defined Benefit Pension and Post-retirement Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (6,353) (7,103)
Other comprehensive income (loss) before reclassification 74 99
Amounts reclassified from accumulated other comprehensive income (19) 0
Tax expense (benefit) 0 (25)
Other comprehensive (loss) income, net of tax 55 74
Ending balance $ (6,298) $ (7,029)