Loans Receivable and Allowance for Loan Losses, Changes in Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Allowance for Loan losses [Roll Forward]
Beginning Balance	$ 8,093	$ 8,257	$ 8,044	$ 8,055
Charge-offs	(201)	(154)	(233)	(527)
Recoveries	39	253	120	828
Net (charge-offs) recoveries	(162)	99	(113)	301
Reversal of provision for loan losses	(500)	(300)	(500)	(300)
Ending Balance	7,431	8,056	7,431	8,056
Ending balance - individually evaluated for impairment					$ 898	$ 1,533	$ 2,159
Ending balance - collectively evaluated for impairment					6,533	6,511	5,897
Ending balance	8,093	8,257	8,044	8,055	7,431	8,044	8,056
Ending loan balance - individually evaluated for impairment					14,336	17,226	19,523
Ending loan balance - collectively evaluated for impairment					646,543	665,123	670,189
Ending loan balance					660,879	682,349	689,712
Residential Mortgage [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,566	2,962	2,224	3,099
Charge-offs		(148)	(20)	(508)
Recoveries	3	3	11	225
Net (charge-offs) recoveries	3	(145)	(9)	(283)
Reversal of provision for loan losses	(182)	204	172	205
Ending Balance	2,387	3,021	2,387	3,021
Ending balance - individually evaluated for impairment					799	927	1,090
Ending balance - collectively evaluated for impairment					1,588	1,297	1,931
Ending balance	2,566	2,962	2,224	3,099	2,387	2,224	3,021
Ending loan balance - individually evaluated for impairment					11,272	12,579	15,038
Ending loan balance - collectively evaluated for impairment					258,518	262,180	270,432
Ending loan balance					269,790	274,759	285,470
Commercial [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	1,566	414	2,736	527
Reversal of provision for loan losses	(54)	219	(1,224)	106
Ending Balance	1,512	633	1,512	633
Ending balance - individually evaluated for impairment						430
Ending balance - collectively evaluated for impairment					1,512	2,306	633
Ending balance	1,566	414	2,736	527	1,512	2,736	633
Ending loan balance - individually evaluated for impairment						430
Ending loan balance - collectively evaluated for impairment					44,774	35,454	43,180
Ending loan balance					44,774	35,884	43,180
Commercial Real Estate [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	792	2,591	457	2,805
Charge-offs	(199)		(199)
Recoveries	30	31	97	364
Net (charge-offs) recoveries	(169)	31	(102)	364
Reversal of provision for loan losses	346	10	614	(537)
Ending Balance	969	2,632	969	2,632
Ending balance - individually evaluated for impairment					65	142	166
Ending balance - collectively evaluated for impairment					904	315	2,466
Ending balance	792	2,591	457	2,805	969	457	2,632
Ending loan balance - individually evaluated for impairment					1,685	1,992	2,053
Ending loan balance - collectively evaluated for impairment					237,805	240,701	232,777
Ending loan balance					239,490	242,693	234,830
ADC [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	2,683	2,060	2,239	1,236
Charge-offs		(6)		(19)
Net (charge-offs) recoveries		(6)		(19)
Reversal of provision for loan losses	(370)	(494)	74	343
Ending Balance	2,313	1,560	2,313	1,560
Ending balance - individually evaluated for impairment					32	32	900
Ending balance - collectively evaluated for impairment					2,281	2,207	660
Ending balance	2,683	2,060	2,239	1,236	2,313	2,239	1,560
Ending loan balance - individually evaluated for impairment					729	1,278	1,582
Ending loan balance - collectively evaluated for impairment					92,621	113,262	111,412
Ending loan balance					93,350	114,540	112,994
Home Equity/2nds [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance	223	229	222	386
Recoveries	3	219	9	239
Net (charge-offs) recoveries	3	219	9	239
Reversal of provision for loan losses		(267)	(5)	(444)
Ending Balance	226	181	226	181
Ending balance - individually evaluated for impairment					2	2	2
Ending balance - collectively evaluated for impairment					224	220	179
Ending balance	223	229	222	386	226	222	181
Ending loan balance - individually evaluated for impairment					579	871	772
Ending loan balance - collectively evaluated for impairment					11,351	12,515	11,401
Ending loan balance					11,930	13,386	12,173
Consumer [Member]
Allowance for Loan losses [Roll Forward]
Beginning Balance		1	1	2
Charge-offs	(2)		(14)
Recoveries	3		3
Net (charge-offs) recoveries	1		(11)
Reversal of provision for loan losses	(1)		10	(1)
Ending Balance		1		1
Ending balance - individually evaluated for impairment							1
Ending balance - collectively evaluated for impairment						1
Ending balance		1	1	2		1	1
Ending loan balance - individually evaluated for impairment					71	76	78
Ending loan balance - collectively evaluated for impairment					1,474	1,011	987
Ending loan balance					1,545	1,087	1,065
Unallocated
Allowance for Loan losses [Roll Forward]
Beginning Balance	263		165
Reversal of provision for loan losses	(239)	28	(141)	28
Ending Balance	24	28	24	28
Ending balance - collectively evaluated for impairment					24	165	28
Ending balance	$ 263	$ 28	$ 165	$ 28	$ 24	$ 165	$ 28

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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