Securities - Debt Securities, Held-to-maturity (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 465,061,000	$ 476,647,000
Unrealized Gains	0	0
Unrealized Losses	(52,197,000)	(53,421,000)
Allowance for Credit Losses	0	0	$ 0
Debt Securities, Held-to-Maturity, Fair Value	412,864,000	423,226,000
Government-sponsored residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	266,140,000	276,493,000
Unrealized Gains	0	0
Unrealized Losses	(28,001,000)	(30,150,000)
Allowance for Credit Losses	0	0
Debt Securities, Held-to-Maturity, Fair Value	238,139,000	246,343,000
Government-sponsored commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	198,921,000	200,154,000
Unrealized Gains	0	0
Unrealized Losses	(24,196,000)	(23,271,000)
Allowance for Credit Losses	0	0
Debt Securities, Held-to-Maturity, Fair Value	$ 174,725,000	$ 176,883,000