Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Held-to-maturity (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Held-to-maturity, Amortized Cost
Due after three months through one year	$ 1,805,000
Due after one through five years	7,395,000
Due after five through ten years	21,384,000
Agency mortgage-backed securities	573,621,000
Total	604,205,000
Held-to-maturity, Estimated Fair Value
Due after three months through one year	1,799,000
Due after one through five years	7,307,000
Due after five through ten years	20,802,000
Agency mortgage-backed securities	501,625,000
Total	531,533,000	$ 564,127,000
Allowance for credit loss current period	$ 12,000	$ 12,000