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Investment Securities - Total investment securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	$ 4,587
Available for Sale, Cost Basis, After 1 year but within 5 years	26,757
Available for Sale, Cost Basis, After 5 years but within 10 years	50,613
Available for Sale, Cost Basis, After 10 years but within 15 years	14,788
Available for Sale, Cost Basis, Over 15 years	56,698
Available for Sale, Cost Basis, Total	153,443	$ 139,684
Available for Sale, Fair Value, Within 1 year	4,634
Available for Sale, Fair Value, After 1 year but within 5 years	27,575
Available for Sale, Fair Value, After 5 years but within 10 years	51,944
Available for Sale, Fair Value, After 10 years but within 15 years	15,380
Available for Sale, Fair Value, Over 15 years	56,883
Available for Sale, Fair Value, Total	156,416	144,165
Held to Maturity, Cost Basis, Within 1 year	3,400
Held to Maturity, Cost Basis, After 1 year but within 5 years	8,164
Held to Maturity, Cost Basis, After 5 years but within 10 years	19,061
Held to Maturity, Cost Basis, After 10 years but within 15 years	10,162
Held to Maturity, Cost Basis, Over 15 years	6,990
Held to Maturity, Cost Basis, Total	47,777	44,222
Held to Maturity, Fair Value, Within 1 year	3,398
Held to Maturity, Fair Value, After 1 year but within 5 years	8,552
Held to Maturity, Fair Value, After 5 years but within 10 years	20,270
Held to Maturity, Fair Value, After 10 years but within 15 years	10,326
Held to Maturity, Fair Value, Over 15 years	7,037
Held to Maturity, Fair Value, Total	49,583	47,106
U.S. Agency
Contractual maturities of securities
Available for Sale, Cost Basis, Total	6,786	2,971
Available for Sale, Fair Value, Total	6,888	3,152
Held to Maturity, Cost Basis, Total	1,500
Held to Maturity, Fair Value, Total	1,500
U.S. Agency mortgage-backed securities
Contractual maturities of securities
Available for Sale, Cost Basis, Total	75,758	65,398
Available for Sale, Fair Value, Total	76,875	67,913
Held to Maturity, Cost Basis, Total	9,317	8,119
Held to Maturity, Fair Value, Total	$ 9,537	$ 8,488

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