Loans Receivable and Allowance for Loan Losses, Changes in Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Allowance for Loan losses [Roll Forward]
Beginning Balance	$ 7,138	$ 8,044
Charge-offs	(15)
Recoveries	45	41
Net (charge-offs) recoveries	30	41
Provision for loan losses	750
Ending Balance	7,918	8,085
Ending balance - individually evaluated for impairment			$ 833	$ 850	$ 1,030
Ending balance - collectively evaluated for impairment			7,085	6,288	7,055
Ending balance	7,918	8,085	7,918	7,138	8,085
Ending loan balance - individually evaluated for impairment			16,637	14,250	16,232
Ending loan balance - collectively evaluated for impairment			622,022	634,182	660,883
Total loans receivable			638,659	648,432	677,115
Residential Mortgage [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,264	2,224
Recoveries	3	5
Net (charge-offs) recoveries	3	5
Provision for loan losses	217	343
Ending Balance	2,484	2,572
Ending balance - individually evaluated for impairment			742	752	905
Ending balance - collectively evaluated for impairment			1,742	1,512	1,667
Ending balance	2,484	2,572	2,484	2,264	2,572
Ending loan balance - individually evaluated for impairment			14,385	11,517	12,259
Ending loan balance - collectively evaluated for impairment			246,596	258,137	258,720
Total loans receivable			260,981	269,654	270,979
Commercial [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	1,421	2,736
Recoveries	5
Net (charge-offs) recoveries	5
Provision for loan losses	139	(996)
Ending Balance	1,565	1,740
Ending balance - collectively evaluated for impairment			1,565	1,421	1,740
Ending balance	1,565	1,740	1,565	1,421	1,740
Ending loan balance - collectively evaluated for impairment			43,490	43,127	44,725
Total loans receivable			43,490	43,127	44,725
Commercial Real Estate [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	984	457
Recoveries	32	34
Net (charge-offs) recoveries	32	34
Provision for loan losses	24	221
Ending Balance	1,040	712
Ending balance - individually evaluated for impairment			62	64	91
Ending balance - collectively evaluated for impairment			978	920	621
Ending balance	1,040	712	1,040	984	712
Ending loan balance - individually evaluated for impairment			1,208	1,221	1,934
Ending loan balance - collectively evaluated for impairment			219,446	228,036	236,684
Total loans receivable			220,654	229,257	238,618
ADC [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,286	2,239
Provision for loan losses	329	340
Ending Balance	2,615	2,579
Ending balance - individually evaluated for impairment			29	32	32
Ending balance - collectively evaluated for impairment			2,586	2,254	2,547
Ending balance	2,615	2,579	2,615	2,286	2,579
Ending loan balance - individually evaluated for impairment			428	880	1,106
Ending loan balance - collectively evaluated for impairment			99,433	91,942	107,827
Total loans receivable			99,861	92,822	108,933
Home Equity/2nds [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	134	222
Recoveries	2	2
Net (charge-offs) recoveries	2	2
Provision for loan losses	15	18
Ending Balance	151	242
Ending balance - individually evaluated for impairment				2	2
Ending balance - collectively evaluated for impairment			151	132	240
Ending balance	151	242	151	134	242
Ending loan balance - individually evaluated for impairment			548	563	859
Ending loan balance - collectively evaluated for impairment			11,651	11,468	11,855
Total loans receivable			12,199	12,031	12,714
Consumer [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance		1
Charge-offs	(15)
Recoveries	3
Net (charge-offs) recoveries	(12)
Provision for loan losses	12
Ending Balance		1
Ending balance - collectively evaluated for impairment					1
Ending balance		1			1
Ending loan balance - individually evaluated for impairment			68	69	74
Ending loan balance - collectively evaluated for impairment			1,406	1,472	1,072
Total loans receivable			1,474	1,541	1,146
Unallocated
Allowance for Loan losses [Roll Forward]
Beginning Balance	49	165
Provision for loan losses	14	74
Ending Balance	63	239
Ending balance - collectively evaluated for impairment			63	49	239
Ending balance	$ 63	$ 239	$ 63	$ 49	$ 239

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 of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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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