Loans Receivable and Allowance for Loan Losses, Summary of Impaired loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interest income recognized [Abstract]
Real estate acquired through foreclosure	$ 2,387	$ 1,537
Residential Mortgage [Member]
Unpaid principal balance [Abstract]
With no related allowance	7,258	7,054
With a related allowance	4,604	5,888
Total	11,862	12,942
Recorded investment [Abstract]
With no related allowance	7,035	6,808
With a related allowance	4,482	5,771
Total	11,517	12,579
Related allowance	752	927
Average recorded investment [Abstract]
With no related allowance	6,844	9,232
With a related allowance	5,322	6,673
Total	12,166	15,905
Interest income recognized [Abstract]
With no related allowance	318	344
With a related allowance	259	288
Total	577	632
Commercial [Member]
Unpaid principal balance [Abstract]
With a related allowance		476
Total		476
Recorded investment [Abstract]
With a related allowance		430
Total		430
Related allowance		430
Average recorded investment [Abstract]
With no related allowance		47
With a related allowance	86	86
Total	86	133
Interest income recognized [Abstract]
With no related allowance		30
With a related allowance		71
Total		101
Commercial Real Estate [Member]
Unpaid principal balance [Abstract]
With no related allowance	908	1,244
With a related allowance	553	795
Total	1,461	2,039
Recorded investment [Abstract]
With no related allowance	668	1,206
With a related allowance	553	786
Total	1,221	1,992
Related allowance	64	142
Average recorded investment [Abstract]
With no related allowance	1,105	1,223
With a related allowance	639	1,151
Total	1,744	2,374
Interest income recognized [Abstract]
With no related allowance	63	52
With a related allowance	33	26
Total	96	78
ADC [Member]
Unpaid principal balance [Abstract]
With no related allowance	752	1,142
With a related allowance	128	135
Total	880	1,277
Recorded investment [Abstract]
With no related allowance	752	1,143
With a related allowance	128	135
Total	880	1,278
Related allowance	32	32
Average recorded investment [Abstract]
With no related allowance	891	542
With a related allowance	132	909
Total	1,023	1,451
Interest income recognized [Abstract]
With no related allowance	36	52
With a related allowance	8	8
Total	44	60
Home Equity/2nds [Member]
Unpaid principal balance [Abstract]
With no related allowance	996	1,290
With a related allowance	12	13
Total	1,008	1,303
Recorded investment [Abstract]
With no related allowance	553	859
With a related allowance	10	12
Total	563	871
Related allowance	2	2
Average recorded investment [Abstract]
With no related allowance	730	570
With a related allowance	16	7
Total	746	577
Interest income recognized [Abstract]
With no related allowance	28	42
With a related allowance	1	1
Total	29	43
Consumer [Member]
Unpaid principal balance [Abstract]
With no related allowance	69	76
Total	69	76
Recorded investment [Abstract]
With no related allowance	69	76
Total	69	76
Average recorded investment [Abstract]
With no related allowance	73	80
Total	73	80
Interest income recognized [Abstract]
With no related allowance	5	2
Total	5	2
Real estate acquired through foreclosure	1,400	$ 1,400
Residential mortgage loans secured by residential real estate properties in formal foreclosure proceedings	$ 2,300