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Fair Value Measurements - Fair Value of Assets on Recurring Basis Segregated by Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt investment securities:
Investment securities - available-for-sale	$ 121,458	$ 111,134
Equity investment securities:
Marketable equity securities	206	206
Level 2 [Member] | Total Fair Value [Member]
Debt investment securities:
Investment securities - available-for-sale	116,313	106,005
Equity investment securities:
Marketable equity securities	340	534
Net Asset Value [Member] | Total Fair Value [Member]
Debt investment securities:
Investment securities - available-for-sale	4,939	4,923
Recurring Basis [Member] | Total Fair Value [Member]
Debt investment securities:
Total available-for-sale securities	121,252	110,928
Equity investment securities:
Marketable equity securities	340	534
Interest rate derivatives :
Interest rate swap derivative fair value hedge	(194)	(92)
Interest rate swap derivative cash flow hedges	(1,344)
Recurring Basis [Member] | Level 1 [Member]
Debt investment securities:
US Treasury, agencies and GSEs	0	0
State and political subdivisions	0	0
Corporate	0	0
Asset backed securities	0	0
Residential mortgage-backed - US agency	0	0
Collateralized mortgage obligations - US agency	0	0
Collateralized mortgage obligations - Private label	0	0
Investment securities - available-for-sale	0	0
Total available-for-sale securities	0	0
Equity investment securities:
Marketable equity securities	0	0
Interest rate derivatives :
Interest rate swap derivative fair value hedge	0	0
Interest rate swap derivative cash flow hedges	0
Recurring Basis [Member] | Level 2 [Member]
Debt investment securities:
US Treasury, agencies and GSEs	19,645	16,820
State and political subdivisions	6,880	1,736
Corporate	7,271	7,631
Asset backed securities	12,416	13,232
Residential mortgage-backed - US agency	20,146	18,980
Collateralized mortgage obligations - US agency	35,100	30,785
Collateralized mortgage obligations - Private label	14,855	16,821
Investment securities - available-for-sale	116,313	106,005
Total available-for-sale securities	116,313	106,005
Equity investment securities:
Marketable equity securities	340	534
Interest rate derivatives :
Interest rate swap derivative fair value hedge	(194)	(92)
Interest rate swap derivative cash flow hedges	(1,344)
Recurring Basis [Member] | Level 3 [Member]
Debt investment securities:
US Treasury, agencies and GSEs	0	0
State and political subdivisions	0	0
Corporate	0	0
Asset backed securities	0	0
Residential mortgage-backed - US agency	0	0
Collateralized mortgage obligations - US agency	0	0
Collateralized mortgage obligations - Private label	0	0
Investment securities - available-for-sale	0	0
Total available-for-sale securities	0	0
Equity investment securities:
Marketable equity securities	0	0
Interest rate derivatives :
Interest rate swap derivative fair value hedge	0	0
Interest rate swap derivative cash flow hedges	0
Recurring Basis [Member] | Level 1, 2 and 3 [Member] | Total Fair Value [Member]
Debt investment securities:
US Treasury, agencies and GSEs	19,645	16,820
State and political subdivisions	6,880	1,736
Corporate	7,271	7,631
Asset backed securities	12,416	13,232
Residential mortgage-backed - US agency	20,146	18,980
Collateralized mortgage obligations - US agency	35,100	30,785
Collateralized mortgage obligations - Private label	14,855	16,821
Investment securities - available-for-sale	116,313	106,005
Recurring Basis [Member] | Net Asset Value [Member] | Total Fair Value [Member]
Debt investment securities:
Investment securities - available-for-sale	$ 4,939	$ 4,923

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount shown on an entity's books for investments in Asset backed securities investment securities.

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