Securities - Schedule of Debt Securities (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,283,989,000	$ 4,778,644,000
Unrealized Gains	18,979,000	0
Unrealized Losses	(406,747,000)	(757,046,000)
Allowance for Credit Losses	0	0	$ 0
Fair Value	3,896,221,000	4,021,598,000
Government-sponsored residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,848,351,000	3,099,328,000
Unrealized Gains	10,757,000	0
Unrealized Losses	(281,528,000)	(537,433,000)
Allowance for Credit Losses	0	0
Fair Value	2,577,580,000	2,561,895,000
Government-sponsored commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,171,653,000	1,362,519,000
Unrealized Gains	7,979,000	0
Unrealized Losses	(106,913,000)	(201,408,000)
Allowance for Credit Losses	0	0
Fair Value	1,072,719,000	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	70,034,000	99,784,000
Unrealized Gains	243,000	0
Unrealized Losses	(9,000)	(2,165,000)
Allowance for Credit Losses	0	0
Fair Value	70,268,000	97,619,000
State and municipal bonds and obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	193,951,000	197,405,000
Unrealized Gains	0	0
Unrealized Losses	(18,297,000)	(14,104,000)
Allowance for Credit Losses	0	0
Fair Value	$ 175,654,000	$ 183,301,000