Loans Receivable and Allowance for Loan Losses, Summary of Impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Residential Mortgage [Member]
Unpaid principal balance [Abstract]
With no related allowance	$ 9,516		$ 9,516		$ 12,929
With a related allowance	7,539		7,539		6,761
Total	17,055		17,055		19,690
Recorded investment [Abstract]
With no related allowance	8,502		8,502		11,572
With a related allowance	7,424		7,424		6,647
Total	15,926		15,926		18,219
Related allowance	1,295		1,295		1,181
Average recorded investment [Abstract]
With no related allowance	7,867	$ 9,071	9,824	$ 9,160
With a related allowance	7,439	8,393	7,184	9,284
Total	15,306	17,464	17,008	18,444
Interest income recognized [Abstract]
With no related allowance	88	98	174	215
With a related allowance	75	73	152	170
Total	163	171	326	385
Commercial [Member]
Unpaid principal balance [Abstract]
With no related allowance	364		364
Total	364		364
Recorded investment [Abstract]
With no related allowance	300		300
Total	300		300
Average recorded investment [Abstract]
With no related allowance	457		78
With a related allowance				49
Total	457		78	49
Interest income recognized [Abstract]
With no related allowance	13		20
Total	13		20
Commercial Real Estate [Member]
Unpaid principal balance [Abstract]
With no related allowance	1,255		1,255		1,562
With a related allowance	756		756		1,410
Total	2,011		2,011		2,972
Recorded investment [Abstract]
With no related allowance	1,202		1,202		1,507
With a related allowance	801		801		1,410
Total	2,003		2,003		2,917
Related allowance	153		153		182
Average recorded investment [Abstract]
With no related allowance	1,326	2,691	1,350	3,027
With a related allowance	751	1,913	1,276	1,928
Total	2,077	4,604	2,626	4,955
Interest income recognized [Abstract]
With no related allowance	14	8	30	47
With a related allowance	8	26	14	50
Total	22	34	44	97
ADC [Member]
Unpaid principal balance [Abstract]
With no related allowance	397		397		636
With a related allowance	2,690		2,690		392
Total	3,087		3,087		1,028
Recorded investment [Abstract]
With no related allowance	397		397		636
With a related allowance	2,649		2,649		355
Total	3,046		3,046		991
Related allowance	1,002		1,002		48
Average recorded investment [Abstract]
With no related allowance	397	435	555	437
With a related allowance	344	378	1,117	391
Total	741	813	1,672	828
Interest income recognized [Abstract]
With no related allowance	4	6	9	12
With a related allowance	6	5	11	10
Total	10	11	20	22
Home Equity/2nds [Member]
Unpaid principal balance [Abstract]
With no related allowance	1,963		1,963
With a related allowance	14		14
Total	1,977		1,977
Recorded investment [Abstract]
With no related allowance	1,448		1,448
With a related allowance	13		13
Total	1,461		1,461
Related allowance	2		2
Average recorded investment [Abstract]
With no related allowance	1,285	594	483	905
With a related allowance	13	626	4	953
Total	1,298	1,220	487	1,858
Interest income recognized [Abstract]
With no related allowance	12	10	20	25
Total	12	10	20	25
Consumer [Member]
Unpaid principal balance [Abstract]
With a related allowance	80		80		84
Total	80		80		84
Recorded investment [Abstract]
With a related allowance	80		80		84
Total	80		80		84
Related allowance	1		1		2
Average recorded investment [Abstract]
With a related allowance	80	91	82	93
Total	80	$ 91	82	93
Interest income recognized [Abstract]
With a related allowance	1			1
Total	1			$ 1
Residential Properties [Member]
Interest income recognized [Abstract]
Residential mortgage loans secured by residential real estate properties in formal foreclosure proceedings	$ 3,800		$ 3,800		$ 3,100