Amortized cost, fair value and tax equivalent yield of securities, by maturity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
U S Treasury [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 1,984
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 1,986
Receivable with Imputed Interest, Effective Yield (Interest Rate)	116.00%
U S Treasury 2 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 13,317
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 13,145
Receivable with Imputed Interest, Effective Yield (Interest Rate)	117.00%
U S Treasury Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 15,301
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 15,131
Receivable with Imputed Interest, Effective Yield (Interest Rate)	117.00%
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	$ 15,905
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 15,694
Receivable with Imputed Interest, Effective Yield (Interest Rate)	123.00%
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	$ 15,905
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 15,694
Receivable with Imputed Interest, Effective Yield (Interest Rate)	123.00%
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	$ 6,575
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 6,789
Receivable with Imputed Interest, Effective Yield (Interest Rate)	239.00%
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	$ 18,997
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 19,456
Receivable with Imputed Interest, Effective Yield (Interest Rate)	247.00%
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	$ 20,897
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 21,577
Receivable with Imputed Interest, Effective Yield (Interest Rate)	266.00%
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	$ 46,469
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 47,822
Receivable with Imputed Interest, Effective Yield (Interest Rate)	254.00%
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	$ 111,369
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 111,348
Receivable with Imputed Interest, Effective Yield (Interest Rate)	171.00%
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	$ 111,369
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 111,348
Receivable with Imputed Interest, Effective Yield (Interest Rate)	171.00%
Corporate Debt Securities 2 [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 11,750
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 11,900
Receivable with Imputed Interest, Effective Yield (Interest Rate)	439.00%
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)	375.00%
Corporate Debt Securities Total [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 12,250
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 12,400
Receivable with Imputed Interest, Effective Yield (Interest Rate)	436.00%
Available-for-sale Securities [Member]
Summary of Investment Holdings [Line Items]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 201,294
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	$ 202,396
Receivable with Imputed Interest, Effective Yield (Interest Rate)	205.00%