Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Held-to-maturity (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Held-to-maturity, Amortized Cost
Due after three months through one year	$ 665,000
Due after one through five years	8,362,000
Due after five through ten years	22,776,000
Agency mortgage-backed securities	604,458,000
Total	636,261,000
Held-to-maturity, Estimated Fair Value
Due after three months through one year	661,000
Due after one through five years	8,140,000
Due after five through ten years	21,931,000
Agency mortgage-backed securities	512,126,000
Total	542,858,000	$ 564,127,000
Allowance for credit loss current period	$ 12,000	$ 12,000