Securities - Schedule of Debt Securities (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,417,908,000	$ 4,778,644,000
Unrealized Gains	14,150,000	0
Unrealized Losses	(428,129,000)	(757,046,000)
Allowance for Credit Losses	0	0	$ 0
Fair Value	4,003,929,000	4,021,598,000
Government-sponsored residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,941,128,000	3,099,328,000
Unrealized Gains	8,868,000	0
Unrealized Losses	(302,358,000)	(537,433,000)
Allowance for Credit Losses	0	0
Fair Value	2,647,638,000	2,561,895,000
Government-sponsored commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,180,724,000	1,362,519,000
Unrealized Gains	5,087,000	0
Unrealized Losses	(109,042,000)	(201,408,000)
Allowance for Credit Losses	0	0
Fair Value	1,076,769,000	1,161,111,000
U.S. Agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		19,608,000
Unrealized Gains		0
Unrealized Losses		(1,936,000)
Allowance for Credit Losses		0
Fair Value		17,672,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	100,019,000	99,784,000
Unrealized Gains	195,000	0
Unrealized Losses	(95,000)	(2,165,000)
Allowance for Credit Losses	0	0
Fair Value	100,119,000	97,619,000
State and municipal bonds and obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	196,037,000	197,405,000
Unrealized Gains	0	0
Unrealized Losses	(16,634,000)	(14,104,000)
Allowance for Credit Losses	0	0
Fair Value	$ 179,403,000	$ 183,301,000