Securities, Additional Disclosure (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities Available-for-Sale [Abstract]
Securities pledged as collateral	$ 78.6	$ 89.0
Securities of any one issuer, other than U.S. Government, exceeding 10% of stockholders' equity	0.0	0.0
Accrued interest receivable on securities	1.4	1.2
Securities Sold under Agreements to Repurchase [Member]
Debt Securities Available-for-Sale [Abstract]
Securities pledged as collateral	78.6	89.0
Asset Pledged as Collateral [Member] | Public Deposits [Member]
Debt Securities Available-for-Sale [Abstract]
Securities pledged as collateral	0.0	0.0
U.S. Treasuries [Member] | Securities Sold under Agreements to Repurchase [Member]
Debt Securities Available-for-Sale [Abstract]
Securities pledged as collateral	37.9	47.8
Federal Agency Mortgage-backed Securities [Member] | Securities Sold under Agreements to Repurchase [Member]
Debt Securities Available-for-Sale [Abstract]
Securities pledged as collateral	30.3	30.2
Federal Agency Debt Securities [Member] | Securities Sold under Agreements to Repurchase [Member]
Debt Securities Available-for-Sale [Abstract]
Securities pledged as collateral	$ 10.4	$ 11.0