Loans Receivable and Allowance for Loan Losses, Summary of Impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Interest income recognized [Abstract]
Real estate acquired through foreclosure	$ 1,684		$ 2,387
Residential Mortgage [Member]
Unpaid principal balance [Abstract]
With no related allowance	10,086		7,258
With a related allowance	4,682		4,604
Total	14,768		11,862
Recorded investment [Abstract]
With no related allowance	9,825		7,035
With a related allowance	4,560		4,482
Total	14,385		11,517
Related allowance	742		752
Average recorded investment [Abstract]
With no related allowance	9,648	$ 6,668
With a related allowance	4,571	5,751
Total	14,219	12,419
Interest income recognized [Abstract]
With no related allowance	89	69
With a related allowance	57	81
Total	146	150
Commercial [Member]
Average recorded investment [Abstract]
With a related allowance		215
Total		215
Commercial Real Estate [Member]
Unpaid principal balance [Abstract]
With no related allowance	905		908
With a related allowance	547		553
Total	1,452		1,461
Recorded investment [Abstract]
With no related allowance	661		668
With a related allowance	547		553
Total	1,208		1,221
Related allowance	62		64
Average recorded investment [Abstract]
With no related allowance	664	1,204
With a related allowance	549	758
Total	1,213	1,962
Interest income recognized [Abstract]
With no related allowance	15	17
With a related allowance	8	8
Total	23	25
ADC [Member]
Unpaid principal balance [Abstract]
With no related allowance	328		752
With a related allowance	104		128
Total	432		880
Recorded investment [Abstract]
With no related allowance	324		752
With a related allowance	104		128
Total	428		880
Related allowance	29		32
Average recorded investment [Abstract]
With no related allowance	235	1,058
With a related allowance	104	134
Total	339	1,192
Interest income recognized [Abstract]
With no related allowance	5	7
With a related allowance	1	2
Total	6	9
Home Equity/2nds [Member]
Unpaid principal balance [Abstract]
With no related allowance	956		996
With a related allowance			12
Total	956		1,008
Recorded investment [Abstract]
With no related allowance	548		553
With a related allowance			10
Total	548		563
Related allowance			2
Average recorded investment [Abstract]
With no related allowance	553	853
With a related allowance		12
Total	553	865
Interest income recognized [Abstract]
With no related allowance	6	13
Total	6	13
Consumer [Member]
Unpaid principal balance [Abstract]
With no related allowance	66		69
With a related allowance	2
Total	68		69
Recorded investment [Abstract]
With no related allowance	66		69
With a related allowance	2
Total	68		69
Average recorded investment [Abstract]
With no related allowance	82	35
With a related allowance	2	40
Total	84	75
Interest income recognized [Abstract]
With no related allowance	1	1
With a related allowance	1
Total	2	$ 1
Real estate acquired through foreclosure	674,000,000		1,400
Residential mortgage loans secured by residential real estate properties in formal foreclosure proceedings	$ 5,100		$ 2,300