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Investment Securities - Total investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	$ 3,150
Available for Sale, Cost Basis, After 1 year but within 5 years	34,390
Available for Sale, Cost Basis, After 5 years but within 10 years	44,850
Available for Sale, Cost Basis, After 10 years but within 15 years	13,608
Available for Sale, Cost Basis, Over 15 years	61,320
Available for Sale, Cost Basis, Total	157,318	$ 139,684
Available for Sale, Fair Value, Within 1 year	3,188
Available for Sale, Fair Value, After 1 year but within 5 years	35,443
Available for Sale, Fair Value, After 5 years but within 10 years	46,275
Available for Sale, Fair Value, After 10 years but within 15 years	14,082
Available for Sale, Fair Value, Over 15 years	61,365
Available for Sale, Fair Value, Total	160,353	144,165
Held to Maturity, Cost Basis, After 1 year but within 5 years	12,293
Held to Maturity, Cost Basis, After 5 years but within 10 years	23,084
Held to Maturity, Cost Basis, After 10 years but within 15 years	9,877
Held to Maturity, Cost Basis, Over 15 years	8,688
Held to Maturity, Cost Basis, Total	53,942	44,222
Held to Maturity, Fair Value, After 1 year but within 5 years	12,768
Held to Maturity, Fair Value, After 5 years but within 10 years	24,509
Held to Maturity, Fair Value, After 10 years but within 15 years	10,105
Held to Maturity, Fair Value, Over 15 years	8,688
Held to Maturity, Fair Value, Total	$ 56,070	$ 47,106

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