Securities - Amortized cost and estimated fair values of debt securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Due in one year or less	$ 125
Due over one year through five years	1,736
Due over five through ten years	5,907
Due after ten years	30,253
Total	38,021
Residential mortgage-backed securities	30
Total	38,051	$ 36,703
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Due in one year or less	128
Due over one year through five years	1,686
Due over five through ten years	5,828
Due after ten years	28,406
Total	36,048
Residential mortgage-backed securities	30
Debt Securities, Available-for-sale, Total	36,078	36,975
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Residential mortgage-backed securities	1,064
Debt Securities, Held-to-maturity, Total	1,064	1,128
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Residential mortgage-backed securities	1,075
Held-to-maturity securities Fair Value	$ 1,075	$ 1,150