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Investment Securities - Total investment securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	$ 3,575
Available for Sale, Cost Basis, After 1 year but within 5 years	32,800
Available for Sale, Cost Basis, After 5 years but within 10 years	46,739
Available for Sale, Cost Basis, After 10 years but within 15 years	13,090
Available for Sale, Cost Basis, Over 15 years	66,015
Available for Sale, Cost Basis, Total	162,219	$ 139,684
Available for Sale, Fair Value, Within 1 year	3,627
Available for Sale, Fair Value, After 1 year but within 5 years	33,881
Available for Sale, Fair Value, After 5 years but within 10 years	48,276
Available for Sale, Fair Value, After 10 years but within 15 years	13,639
Available for Sale, Fair Value, Over 15 years	66,420
Available for Sale, Fair Value, Total	165,843	144,165
Held to Maturity, Cost Basis, Within 1 year	3,000
Held to Maturity, Cost Basis, After 1 year but within 5 years	8,155
Held to Maturity, Cost Basis, After 5 years but within 10 years	23,536
Held to Maturity, Cost Basis, After 10 years but within 15 years	9,441
Held to Maturity, Cost Basis, Over 15 years	9,420
Held to Maturity, Cost Basis, Total	53,552	44,222
Held to Maturity, Fair Value, Within 1 year	2,999
Held to Maturity, Fair Value, After 1 year but within 5 years	8,553
Held to Maturity, Fair Value, After 5 years but within 10 years	25,083
Held to Maturity, Fair Value, After 10 years but within 15 years	9,761
Held to Maturity, Fair Value, Over 15 years	9,495
Held to Maturity, Fair Value, Total	$ 55,891	$ 47,106

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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

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