Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pre-tax Amount
Other comprehensive income , Pre-tax Amount	$ 41,219	$ 8,770
Income Tax Benefit (Expense)
Other comprehensive loss, Income Tax Benefit (Expense)	(10,994)	(2,340)
Net of Tax
Balance at beginning of period	2,617,486	2,486,066
Other comprehensive income	30,225	6,430
Balance at end of period	2,648,852	2,513,761
Accumulated Other Comprehensive Income (Loss)
Pre-tax Amount
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount	(632,793)	(723,100)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount	(591,574)	(714,330)
Income Tax Benefit (Expense)
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense)	168,799	192,890
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense)	157,805	190,550
Net of Tax
Balance at beginning of period	(463,994)	(530,210)
Other comprehensive income	30,225	6,430
Balance at end of period	(433,769)	(523,780)
Investment securities
Pre-tax Amount
Unrealized net gains (losses) arising during the year, Pre-tax Amount	31,363	(3,432)
Reclassification of net losses (gains) to net income, Pre-tax Amount	(37)
Other comprehensive income , Pre-tax Amount	40,983	7,728
Income Tax Benefit (Expense)
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense)	(8,365)	915
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense)	10
Other comprehensive loss, Income Tax Benefit (Expense)	(10,931)	(2,061)
Net of Tax
Unrealized net gains (losses) arising during the year, Net of tax	22,998	(2,517)
Reclassification of net gains (losses) to net income, Net of tax	(27)
Other comprehensive income	30,052	5,667
Amortization of unrealized holding losses on held-to-maturity securities
Pre-tax Amount
Reclassification of net losses (gains) to net income, Pre-tax Amount	9,657	11,160
Income Tax Benefit (Expense)
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense)	(2,576)	(2,976)
Net of Tax
Reclassification of net gains (losses) to net income, Net of tax	7,081	8,184
Cash flow derivative hedges
Pre-tax Amount
Unrealized net gains (losses) arising during the year, Pre-tax Amount	236	(713)
Reclassification of net losses (gains) to net income, Pre-tax Amount		1,755
Other comprehensive income , Pre-tax Amount	236	1,042
Income Tax Benefit (Expense)
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense)	(63)	189
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense)		(468)
Other comprehensive loss, Income Tax Benefit (Expense)	(63)	(279)
Net of Tax
Balance at beginning of period	(85)	(803)
Unrealized net gains (losses) arising during the year, Net of tax	173	(524)
Reclassification of net gains (losses) to net income, Net of tax		1,287
Other comprehensive income	173	763
Balance at end of period	$ 88	$ (40)