Loans Receivable and Allowance for Loan Losses, Summary of Impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Interest income recognized [Abstract]
Real estate acquired through foreclosure	$ 1,873		$ 1,873		$ 1,537
Residential Mortgage [Member]
Unpaid principal balance [Abstract]
With no related allowance	6,534		6,534		7,054
With a related allowance	5,053		5,053		5,888
Total	11,587		11,587		12,942
Recorded investment [Abstract]
With no related allowance	6,339		6,339		6,808
With a related allowance	4,933		4,933		5,771
Total	11,272		11,272		12,579
Related allowance	799		799		927
Average recorded investment [Abstract]
With no related allowance	6,355	$ 6,718	6,797	$ 9,618
With a related allowance	4,943	6,020	5,532	6,899
Total	11,298	12,738	12,329	16,517
Interest income recognized [Abstract]
With no related allowance	57	75	198	229
With a related allowance	66	79	206	219
Total	123	154	404	448
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		6		59
With a related allowance			108
Total		6	108	59
Commercial Real Estate [Member]
Unpaid principal balance [Abstract]
With no related allowance	1,363		1,363		1,244
With a related allowance	559		559		795
Total	1,922		1,922		2,039
Recorded investment [Abstract]
With no related allowance	1,126		1,126		1,206
With a related allowance	559		559		786
Total	1,685		1,685		1,992
Related allowance	65		65		142
Average recorded investment [Abstract]
With no related allowance	1,259	1,572	1,215	1,240
With a related allowance	561	774	660	1,243
Total	1,820	2,346	1,875	2,483
Interest income recognized [Abstract]
With no related allowance	15	21	52	56
With a related allowance	6	4	25	19
Total	21	25	77	75
ADC [Member]
Unpaid principal balance [Abstract]
With no related allowance	599		599		1,142
With a related allowance	130		130		135
Total	729		729		1,277
Recorded investment [Abstract]
With no related allowance	599		599		1,143
With a related allowance	130		130		135
Total	729		729		1,278
Related allowance	32		32		32
Average recorded investment [Abstract]
With no related allowance	599	674	925	547
With a related allowance	130	176	133	1,103
Total	729	850	1,058	1,650
Interest income recognized [Abstract]
With no related allowance	8	7	22	20
With a related allowance	2	2	6	9
Total	10	9	28	29
Home Equity/2nds [Member]
Unpaid principal balance [Abstract]
With no related allowance	1,010		1,010		1,290
With a related allowance	13		13		13
Total	1,023		1,023		1,303
Recorded investment [Abstract]
With no related allowance	566		566		859
With a related allowance	13		13		12
Total	579		579		871
Related allowance	2		2		2
Average recorded investment [Abstract]
With no related allowance	574	371	775	552
With a related allowance	11	400	17	6
Total	585	771	792	558
Interest income recognized [Abstract]
With no related allowance	11	10	32	34
With a related allowance		4	1	11
Total	11	14	33	45
Consumer [Member]
Unpaid principal balance [Abstract]
With no related allowance	68		68		76
With a related allowance	3		3
Total	71		71		76
Recorded investment [Abstract]
With no related allowance	68		68		76
With a related allowance	3		3
Total	71		71		76
Average recorded investment [Abstract]
With no related allowance	68		52
With a related allowance	3	79	22	81
Total	71	79	74	81
Interest income recognized [Abstract]
With no related allowance	1		4
With a related allowance		1		2
Total	1	$ 1	4	$ 2
Real estate acquired through foreclosure	1,300		1,300		1,400
Residential Properties [Member]
Interest income recognized [Abstract]
Residential mortgage loans secured by residential real estate properties in formal foreclosure proceedings	$ 3,500		$ 3,500		$ 1,900