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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pre-tax Amount        
Other comprehensive income , Pre-tax Amount $ 25,718 $ 90,656 $ 103,433 $ 105,764
Income Tax Benefit (Expense)        
Other comprehensive loss, Income Tax Benefit (Expense) (6,859) (24,182) (27,588) (28,212)
Net of Tax        
Balance at beginning of period 2,694,545 2,550,312 2,617,486 2,486,066
Other comprehensive income 18,859 66,474 75,845 77,552
Balance at end of period 2,733,921 2,648,034 2,733,921 2,648,034
Accumulated Other Comprehensive Income (Loss)        
Pre-tax Amount        
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount (555,078) (707,992) (632,793) (723,100)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount (529,360) (617,336) (529,360) (617,336)
Income Tax Benefit (Expense)        
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) 148,070 188,860 168,799 192,890
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) 141,211 164,678 141,211 164,678
Net of Tax        
Balance at beginning of period (407,008) (519,132) (463,994) (530,210)
Other comprehensive income 18,859 66,474 75,845 77,552
Balance at end of period (388,149) (452,658) (388,149) (452,658)
Investment securities        
Pre-tax Amount        
Unrealized net losses arising during the period, Pre-tax Amount 14,877 76,226 72,594 68,517
Reclassification of net losses to net income, Pre-tax Amount     (37)  
Other comprehensive income , Pre-tax Amount 26,341 90,148 103,660 104,264
Income Tax Benefit (Expense)        
Unrealized net losses arising during the period, Income Tax Benefit (Expense) (3,969) (20,333) (19,364) (18,277)
Reclassification of net losses to net income, Income Tax Benefit (Expense)     10  
Other comprehensive loss, Income Tax Benefit (Expense) (7,026) (24,047) (27,650) (27,812)
Net of Tax        
Unrealized net losses arising during the period, Net of tax 10,908 55,893 53,230 50,240
Reclassification of net losses to net income, Net of tax     (27)  
Other comprehensive income 19,315 66,101 76,010 76,452
Amortization of unrealized holding losses on held-to-maturity securities        
Pre-tax Amount        
Reclassification of net losses to net income, Pre-tax Amount 11,464 13,922 31,103 35,747
Income Tax Benefit (Expense)        
Reclassification of net losses to net income, Income Tax Benefit (Expense) (3,057) (3,714) (8,296) (9,535)
Net of Tax        
Reclassification of net losses to net income, Net of tax 8,407 10,208 22,807 26,212
Cash flow derivative hedges        
Pre-tax Amount        
Unrealized net losses arising during the period, Pre-tax Amount (156) 501 193 (325)
Reclassification of net losses to net income, Pre-tax Amount   7   1,825
Amounts excluded from the assessment of hedge effectiveness, Pre-tax Amount (467)   (420)  
Other comprehensive income , Pre-tax Amount (623) 508 (227) 1,500
Income Tax Benefit (Expense)        
Unrealized net losses arising during the period, Income Tax Benefit (Expense) 40 (133) (53) 87
Reclassification of net losses to net income, Income Tax Benefit (Expense)   (2)   (487)
Amounts excluded from the assessment of hedge effectiveness, Income Tax Benefit (Expense) 127   115  
Other comprehensive loss, Income Tax Benefit (Expense) 167 (135) 62 (400)
Net of Tax        
Balance at beginning of period 206 (76) (85) (803)
Unrealized net losses arising during the period, Net of tax (116) 368 140 (238)
Reclassification of net losses to net income, Net of tax   5   1,338
Amounts excluded from the assessment of hedge effectiveness, Net of tax (340)   (305)  
Other comprehensive income (456) 373 (165) 1,100
Balance at end of period $ (250) $ 297 $ (250) $ 297