Accumulated Other Comprehensive (Loss) Income - Schedule of Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax
Balance, beginning	$ 3,020,281	$ 2,843,305
Other comprehensive (losses) income before reclassifications	112,356	(32,466)
Net current period other comprehensive income (loss)	111,807	(31,575)
Balance, ending	3,245,050	2,874,594
Accumulated Other Compre- hensive (Loss) Income
AOCI Attributable to Parent, Net of Tax
Balance, beginning	(374,113)	(468,792)
Balance, ending	(262,306)	(500,367)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-For-Sale, Gains and Transfers Included in Net Income, and Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Attributable to Parent, Net of Tax
Reclassification adjustments	(2,930)	(2,466)
(Losses) Gains on Available-For-Sale and Transferred Debt Securities
AOCI Attributable to Parent, Net of Tax
Balance, beginning	(377,728)	(474,338)
Other comprehensive (losses) income before reclassifications	111,704	(34,364)
Net current period other comprehensive income (loss)	114,043	(30,983)
Balance, ending	(263,685)	(505,321)
Reclassification adjustments for gains (losses) and transfers included in net income
AOCI Attributable to Parent, Net of Tax
Reclassification adjustments	(42)	24
Reclassification adjustments for amortization included in net income for transferred securities
AOCI Attributable to Parent, Net of Tax
Reclassification adjustments	2,381	3,357
(Losses) Gains on Derivatives Used for Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax
Balance, beginning	3,615	5,546
Other comprehensive (losses) income before reclassifications	652	1,898
Reclassification adjustments	(2,888)	(2,490)
Net current period other comprehensive income (loss)	(2,236)	(592)
Balance, ending	$ 1,379	$ 4,954