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Loans and Allowance for Loan Losses (Detail Textuals)		3 Months Ended		9 Months Ended
		Sep. 30, 2018 USD ($) Contract	Sep. 30, 2017 USD ($) Contract	Sep. 30, 2018 USD ($) Contract	Sep. 30, 2017 USD ($) Contract	Dec. 31, 2017 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Amount of loans pledged as collateral to the Federal Home Loan Bank		$ 498,200,000		$ 498,200,000
Look back period				5 years
Impaired loans individually evaluated for impairment		9,305,000		$ 9,305,000		$ 10,356,000
Impaired loans were evaluated based on the fair value of the loan's collateral		4,200,000		4,200,000		4,000,000
Specific allowance related to impaired loans		1,225,000		1,225,000		1,333,000
Impaired loans with no reserve allocation		$ 2,989,000		$ 2,989,000		$ 2,433,000
Impaired loans required no reserve allocation, percentage		32.00%		32.00%		23.00%
Interest income recognized on impaired loans		$ 52,000	$ 61,000	$ 151,000	$ 200,000
Troubled debt restructurings		5,400,000		5,400,000		$ 6,400,000
Amount of specific reserves related to TDRs which were allocated to the allowance for loan losses		$ 569,000		$ 569,000		577,000
Number of contracts modified | Contract	[1]	3	1	8	3
Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Specific allowance related to impaired loans		$ 166,000		$ 166,000		521,000
Impaired loans with no reserve allocation		1,142,000		1,142,000		674,000
Value of mortgage loans in process of foreclosure		253,000		253,000
Residential Real Estate | Mortgages [Member]
Loans and Leases Receivable Disclosure [Line Items]
Impaired loans individually evaluated for impairment		5,145,000		$ 5,145,000		5,072,000
Number of contracts modified | Contract	[1]			1	1
Number of mortgage loans in process of foreclosure | Contract				1
Value of mortgage loans in process of foreclosure		48,000		$ 48,000
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Specific allowance related to impaired loans		21,000		21,000		243,000
Impaired loans with no reserve allocation		119,000		$ 119,000		366,000
Number of mortgage loans in process of foreclosure | Contract				1
Value of mortgage loans in process of foreclosure		366,000		$ 366,000
Commercial real estate | Mortgages [Member]
Loans and Leases Receivable Disclosure [Line Items]
Impaired loans individually evaluated for impairment		$ 1,028,000		$ 1,028,000		2,004,000
Number of contracts modified | Contract	[1]	0	1	0	1
Minimum
Loans and Leases Receivable Disclosure [Line Items]
Look back period				3 years
Maximum
Loans and Leases Receivable Disclosure [Line Items]
Look back period				5 years
Performing TDRs
Loans and Leases Receivable Disclosure [Line Items]
Troubled debt restructurings		$ 3,200,000		$ 3,200,000		1,700,000
Nonperforming TDRs
Loans and Leases Receivable Disclosure [Line Items]
Troubled debt restructurings		$ 2,200,000		$ 2,200,000		$ 4,700,000
[1] The amounts reported post-modification are inclusive of all partial pay-downs and charge-offs, and no portion of the debt was forgiven. Loans modified as a TDR that were fully paid down, charged-off or foreclosed upon during the period ended are not reported.

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