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Investment Securities - Total investment securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	$ 5,060
Available for Sale, Cost Basis, After 1 year but within 5 years	22,222
Available for Sale, Cost Basis, After 5 years but within 10 years	48,851
Available for Sale, Cost Basis, After 10 years but within 15 years	19,253
Available for Sale, Cost Basis, Over 15 years	41,886
Available for Sale, Cost Basis, Total	137,272	$ 139,577
Available for Sale, Fair Value, Within 1 year	5,093
Available for Sale, Fair Value, After 1 year but within 5 years	22,536
Available for Sale, Fair Value, After 5 years but within 10 years	50,395
Available for Sale, Fair Value, After 10 years but within 15 years	20,120
Available for Sale, Fair Value, Over 15 years	43,572
Available for Sale, Fair Value, Total	141,716	141,749
Held to Maturity, Cost Basis, Within 1 year	3,400
Held to Maturity, Cost Basis, After 1 year but within 5 years	7,629
Held to Maturity, Cost Basis, After 5 years but within 10 years	17,115
Held to Maturity, Cost Basis, After 10 years but within 15 years	9,395
Held to Maturity, Cost Basis, Over 15 years	5,097
Held to Maturity, Cost Basis, Total	42,636	39,936
Held to Maturity, Fair Value, Within 1 year	3,403
Held to Maturity, Fair Value, After 1 year but within 5 years	8,054
Held to Maturity, Fair Value, After 5 years but within 10 years	18,607
Held to Maturity, Fair Value, After 10 years but within 15 years	9,946
Held to Maturity, Fair Value, Over 15 years	5,298
Held to Maturity, Fair Value, Total	45,308	41,082
U.S. Agency
Contractual maturities of securities
Available for Sale, Cost Basis, Total	3,079	5,084
Available for Sale, Fair Value, Total	3,276	5,116
U.S. Agency mortgage-backed securities
Contractual maturities of securities
Available for Sale, Cost Basis, Total	66,198	80,046
Available for Sale, Fair Value, Total	69,042	81,633
Held to Maturity, Cost Basis, Total	7,719	9,466
Held to Maturity, Fair Value, Total	$ 8,113	$ 9,713

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