Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pre-tax Amount
Other comprehensive income , Pre-tax Amount	$ 36,496	$ 6,338	$ 77,715	$ 15,108
Income Tax Benefit (Expense)
Other comprehensive loss, Income Tax Benefit (Expense)	(9,735)	(1,690)	(20,729)	(4,030)
Net of Tax
Balance at beginning of period	2,648,852	2,513,761	2,617,486	2,486,066
Other comprehensive income	26,761	4,648	56,986	11,078
Balance at end of period	2,694,545	2,550,312	2,694,545	2,550,312
Accumulated Other Comprehensive Income (Loss)
Pre-tax Amount
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount	(591,574)	(714,330)	(632,793)	(723,100)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount	(555,078)	(707,992)	(555,078)	(707,992)
Income Tax Benefit (Expense)
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense)	157,805	190,550	168,799	192,890
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense)	148,070	188,860	148,070	188,860
Net of Tax
Balance at beginning of period	(433,769)	(523,780)	(463,994)	(530,210)
Other comprehensive income	26,761	4,648	56,986	11,078
Balance at end of period	(407,008)	(519,132)	(407,008)	(519,132)
Investment securities
Pre-tax Amount
Unrealized net gains (losses) arising during the year, Pre-tax Amount	26,354	(4,277)	57,717	(7,709)
Reclassification of net losses (gains) to net income, Pre-tax Amount			(37)
Other comprehensive income , Pre-tax Amount	36,336	6,388	77,319	14,116
Income Tax Benefit (Expense)
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense)	(7,030)	1,141	(15,395)	2,056
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense)			10
Other comprehensive loss, Income Tax Benefit (Expense)	(9,693)	(1,704)	(20,624)	(3,765)
Net of Tax
Unrealized net gains (losses) arising during the year, Net of tax	19,324	(3,136)	42,322	(5,653)
Reclassification of net gains (losses) to net income, Net of tax			(27)
Other comprehensive income	26,643	4,684	56,695	10,351
Amortization of unrealized holding losses on held-to-maturity securities
Pre-tax Amount
Reclassification of net losses (gains) to net income, Pre-tax Amount	9,982	10,665	19,639	21,825
Income Tax Benefit (Expense)
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense)	(2,663)	(2,845)	(5,239)	(5,821)
Net of Tax
Reclassification of net gains (losses) to net income, Net of tax	7,319	7,820	14,400	16,004
Cash flow derivative hedges
Pre-tax Amount
Unrealized net gains (losses) arising during the year, Pre-tax Amount	113	(113)	349	(826)
Reclassification of net losses (gains) to net income, Pre-tax Amount		63		1,818
Amounts excluded from the assessment of hedge effectiveness, Pre-tax Amount	47		47
Other comprehensive income , Pre-tax Amount	160	(50)	396	992
Income Tax Benefit (Expense)
Unrealized net gains (losses) arising during the year, Income Tax Benefit (Expense)	(29)	31	(92)	220
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense)		(17)		(485)
Amounts excluded from the assessment of hedge effectiveness, Income Tax Benefit (Expense)	(13)		(13)
Other comprehensive loss, Income Tax Benefit (Expense)	(42)	14	(105)	(265)
Net of Tax
Balance at beginning of period	88	(40)	(85)	(803)
Unrealized net gains (losses) arising during the year, Net of tax	84	(82)	257	(606)
Reclassification of net gains (losses) to net income, Net of tax		46		1,333
Amounts excluded from the assessment of hedge effectiveness, Net of tax	34		34
Other comprehensive income	118	(36)	291	727
Balance at end of period	$ 206	$ (76)	$ 206	$ (76)