Amortized cost, fair value and tax equivalent yield of securities, by maturity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
U S Treasury [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 6,918
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 6,729
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.48%
U S Treasury 2 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 13,325
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 12,374
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.17%
U S Treasury Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 20,243
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 19,103
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.28%
U S Government Agency Notes [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 996
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 930
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.09%
U S Government Agency Notes 2 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 14,913
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 13,921
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.24%
U S Government Agency Notes Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 15,909
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 14,851
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.23%
US States and Political Subdivisions Debt Securities [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 512
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 490
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.74%
U S States And Political Subdivisions 2 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 12,789
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 11,893
Receivable with Imputed Interest, Effective Yield (Interest Rate)	2.38%
U S States And Political Subdivisions 3 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 12,393
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 11,547
Receivable with Imputed Interest, Effective Yield (Interest Rate)	2.38%
U S States And Political Subdivisions 4 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 25,853
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 24,369
Receivable with Imputed Interest, Effective Yield (Interest Rate)	2.54%
U S States And Political Subdivisions Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 51,547
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 48,299
Receivable with Imputed Interest, Effective Yield (Interest Rate)	2.45%
Mortgage Backed Securities Collateralized Mortgage Obligations [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 124,860
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 119,798
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.91%
Mortgage Backed Securities Collateralized Mortgage Obligations Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 124,860
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 119,798
Receivable with Imputed Interest, Effective Yield (Interest Rate)	1.91%
Corporate Debt Securities 2 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 13,250
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 13,101
Receivable with Imputed Interest, Effective Yield (Interest Rate)	4.33%
Corporate Debt Securities 3 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 500
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 500
Receivable with Imputed Interest, Effective Yield (Interest Rate)	4.75%
Corporate Debt Securities Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 13,750
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 13,601
Receivable with Imputed Interest, Effective Yield (Interest Rate)	4.35%
Available-for-Sale Securities [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 226,309
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 215,652
Receivable with Imputed Interest, Effective Yield (Interest Rate)	2.16%