Loans Receivable and Allowance for Loan Losses, Summary of Impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Interest income recognized [Abstract]
Real estate acquired through foreclosure	$ 1,104		$ 1,104		$ 973
Residential Mortgage [Member]
Unpaid principal balance [Abstract]
With no related allowance	12,856		12,856		9,854
With a related allowance	9,306		9,306		11,176
Total	22,162		22,162		21,030
Recorded investment [Abstract]
With no related allowance	11,306		11,306		9,338
With a related allowance	9,073		9,073		11,065
Total	20,379		20,379		20,403
Related allowance	1,544		1,544		1,703
Average recorded investment [Abstract]
With no related allowance	10,423	$ 12,734	9,696	$ 13,774
With a related allowance	8,910	9,831	9,231	10,684
Total	19,333	22,565	18,927	24,458
Interest income recognized [Abstract]
With no related allowance	138	132	353	417
With a related allowance	116	106	286	356
Total	254	238	639	773
Commercial [Member]
Unpaid principal balance [Abstract]
With no related allowance	0		0		0
With a related allowance	0		0		148
Total	0		0		148
Recorded investment [Abstract]
With no related allowance	0		0		0
With a related allowance	0		0		148
Total	0		0		148
Related allowance	0		0		15
Average recorded investment [Abstract]
With no related allowance	0	274	0	150
With a related allowance	0	149	37	182
Total	0	423	37	332
Interest income recognized [Abstract]
With no related allowance	0	2	0	3
With a related allowance	0	2	0	7
Total	0	4	0	10
Commercial Real Estate [Member]
Unpaid principal balance [Abstract]
With no related allowance	1,576		1,576		3,900
With a related allowance	1,892		1,892		1,958
Total	3,468		3,468		5,858
Recorded investment [Abstract]
With no related allowance	1,527		1,527		3,698
With a related allowance	1,892		1,892		1,958
Total	3,419		3,419		5,656
Related allowance	186		186		196
Average recorded investment [Abstract]
With no related allowance	1,531	3,730	2,652	4,655
With a related allowance	1,896	1,977	1,919	2,040
Total	3,427	5,707	4,571	6,695
Interest income recognized [Abstract]
With no related allowance	22	57	69	134
With a related allowance	23	25	73	77
Total	45	82	142	211
ADC [Member]
Unpaid principal balance [Abstract]
With no related allowance	636		636		441
With a related allowance	402		402		417
Total	1,038		1,038		858
Recorded investment [Abstract]
With no related allowance	636		636		441
With a related allowance	367		367		417
Total	1,003		1,003		858
Related allowance	50		50		53
Average recorded investment [Abstract]
With no related allowance	637	1,031	487	1,431
With a related allowance	369	426	385	513
Total	1,006	1,457	872	1,944
Interest income recognized [Abstract]
With no related allowance	9	9	21	36
With a related allowance	6	6	16	20
Total	15	15	37	56
Home Equity/2nds[Member]
Unpaid principal balance [Abstract]
With no related allowance	0		0		2,139
With a related allowance	0		0		1,608
Total	0		0		3,747
Recorded investment [Abstract]
With no related allowance	0		0		1,529
With a related allowance	0		0		1,608
Total	0		0		3,137
Related allowance	0		0		402
Average recorded investment [Abstract]
With no related allowance	918	1,911	679	1,991
With a related allowance	180	1,078	715	370
Total	1,098	2,989	1,394	2,361
Interest income recognized [Abstract]
With no related allowance	15	18	40	59
With a related allowance	0	6	0	7
Total	15	24	40	66
Consumer [Member]
Unpaid principal balance [Abstract]
With no related allowance	0		0		0
With a related allowance	87		87		96
Total	87		87		96
Recorded investment [Abstract]
With no related allowance	0		0		0
With a related allowance	87		87		96
Total	87		87		96
Related allowance	2		2		4
Average recorded investment [Abstract]
With no related allowance	0	0	0	23
With a related allowance	88	102	91	73
Total	88	102	91	96
Interest income recognized [Abstract]
With no related allowance	0	0	0	0
With a related allowance	1	1	2	2
Total	1	$ 1	2	$ 2
Residential Properties [Member]
Interest income recognized [Abstract]
Residential mortgage loans secured by residential real estate properties in formal foreclosure proceedings	3,100		3,100
Real estate acquired through foreclosure	$ 287		$ 287		$ 393