Securities, Securities with Unrealized Losses, Securities Pledged as Collateral and Holdings of Securities by One Issuer in Amount Greater Than 10% of Stockholders' Equity (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities Available-for-Sale [Abstract]
Securities collateral pledged	$ 64.4	$ 53.2
Securities of any one issuer, other than U.S. Government, exceeding 10% of stockholders' equity	0.0	0.0
Asset Pledged as Collateral [Member] | Deposits [Member]
Debt Securities Available-for-Sale [Abstract]
Securities pledged to secure public deposits	0.0	0.0
Federal Agency Mortgage-backed Securities [Member]
Debt Securities Available-for-Sale [Abstract]
Securities collateral pledged	11.9	25.9
Federal Agency Debt [Member]
Debt Securities Available-for-Sale [Abstract]
Securities collateral pledged	33.3	13.3
US Treasury Securities [Member]
Debt Securities Available-for-Sale [Abstract]
Securities collateral pledged	$ 19.2
SBA Pools [Member]
Debt Securities Available-for-Sale [Abstract]
Securities collateral pledged		9.8
Federal Agency CMO [Member]
Debt Securities Available-for-Sale [Abstract]
Securities collateral pledged		$ 4.2