Loans Receivable and Allowance for Loan Losses, Changes in Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan losses [Roll Forward]
Beginning Balance	$ 8,044	$ 8,055
Charge-offs	(571)	(606)
Recoveries	165	895
Net (charge-offs) recoveries	(406)	289
Reversal of provision for loan losses	(500)	(300)
Ending Balance	7,138	8,044
Ending balance - individually evaluated for impairment			$ 850	$ 1,533
Ending balance - collectively evaluated for impairment			6,288	6,511
Ending balance	7,138	8,044	7,138	8,044
Ending loan balance - individually evaluated for impairment			14,250	17,226
Ending loan balance - collectively evaluated for impairment			631,435	665,123
Loans receivable			645,685	682,349
Residential Mortgage [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,224	3,099
Charge-offs	(20)	(534)
Recoveries	14	228
Net (charge-offs) recoveries	(6)	(306)
Reversal of provision for loan losses	46	(569)
Ending Balance	2,264	2,224
Ending balance - individually evaluated for impairment			752	927
Ending balance - collectively evaluated for impairment			1,512	1,297
Ending balance	2,264	2,224	2,264	2,224
Ending loan balance - individually evaluated for impairment			11,517	12,579
Ending loan balance - collectively evaluated for impairment			256,635	262,180
Loans receivable			268,152	274,759
Commercial [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,736	527
Reversal of provision for loan losses	(1,315)	2,209
Ending Balance	1,421	2,736
Ending balance - individually evaluated for impairment				430
Ending balance - collectively evaluated for impairment			1,421	2,306
Ending balance	1,421	2,736	1,421	2,736
Ending loan balance - individually evaluated for impairment				430
Ending loan balance - collectively evaluated for impairment			43,127	35,454
Loans receivable			43,127	35,884
Commercial Real Estate [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	457	2,805
Charge-offs	(537)	(38)
Recoveries	130	424
Net (charge-offs) recoveries	(407)	386
Reversal of provision for loan losses	934	(2,734)
Ending Balance	984	457
Ending balance - individually evaluated for impairment			64	142
Ending balance - collectively evaluated for impairment			920	315
Ending balance	984	457	984	457
Ending loan balance - individually evaluated for impairment			1,221	1,992
Ending loan balance - collectively evaluated for impairment			226,791	240,701
Loans receivable			228,012	242,693
ADC [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,239	1,236
Charge-offs		(34)
Recoveries	5
Net (charge-offs) recoveries	5	(34)
Reversal of provision for loan losses	42	1,037
Ending Balance	2,286	2,239
Ending balance - individually evaluated for impairment			32	32
Ending balance - collectively evaluated for impairment			2,254	2,207
Ending balance	2,286	2,239	2,286	2,239
Ending loan balance - individually evaluated for impairment			880	1,278
Ending loan balance - collectively evaluated for impairment			91,942	113,262
Loans receivable			92,822	114,540
Home Equity/2nds [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	222	386
Recoveries	11	243
Net (charge-offs) recoveries	11	243
Reversal of provision for loan losses	(99)	(407)
Ending Balance	134	222
Ending balance - individually evaluated for impairment			2	2
Ending balance - collectively evaluated for impairment			132	220
Ending balance	134	222	134	222
Ending loan balance - individually evaluated for impairment			563	871
Ending loan balance - collectively evaluated for impairment			11,468	12,515
Loans receivable			12,031	13,386
Consumer [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	1	2
Charge-offs	(14)
Recoveries	5
Net (charge-offs) recoveries	(9)
Reversal of provision for loan losses	8	(1)
Ending Balance		1
Ending balance - collectively evaluated for impairment				1
Ending balance	1	1		1
Ending loan balance - individually evaluated for impairment			69	76
Ending loan balance - collectively evaluated for impairment			1,472	1,011
Loans receivable			1,541	1,087
Unallocated
Allowance for Loan losses [Roll Forward]
Beginning Balance	165
Reversal of provision for loan losses	(116)	165
Ending Balance	49	165
Ending balance - collectively evaluated for impairment			49	165
Ending balance	$ 49	$ 165	$ 49	$ 165

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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