Loans Receivable and Allowance for Loan Losses, Classes of Loan Portfolio by Aging Categories of Performing and Nonaccrual Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	$ 5,928		$ 7,520
Current	645,036		602,758
Total loans	650,964	$ 612,458	610,278
Non-accrual	6,377		9,852
Loans in nonaccrual status	1,200	338
Actual interest income recorded on nonaccrual loans	403	130
30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	1,173		1,616
60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	1,694		2,245
90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	3,061		3,659
Residential Mortgage [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	4,753		4,510
Current	284,416		253,149
Total loans	289,169	268,896	257,659
Non-accrual	4,531		3,580
Residential Mortgage [Member] | 30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	1,173		1,472
Residential Mortgage [Member] | 60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	1,216		2,074
Residential Mortgage [Member] | 90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	2,364		964
Commercial [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Current	37,485		46,468
Total loans	37,485	42,359	46,468
Non-accrual	84		151
Commercial [Member] | 30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Commercial [Member] | 60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Commercial [Member] | 90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Commercial Real Estate [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	478		686
Current	222,689		195,024
Total loans	223,167	198,915	195,710
Non-accrual	160		2,938
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	478		171
Commercial Real Estate [Member] | 90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		515
ADC [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	239		112
Current	83,925		89,990
Total loans	84,164	81,340	90,102
Non-accrual	318		269
ADC [Member] | 30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		106
ADC [Member] | 60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
ADC [Member] | 90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	239		6
Home Equity/2nds[Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	458		2,208
Current	15,403		16,921
Total loans	15,861	19,739	19,129
Non-accrual	1,284		2,914
Home Equity/2nds[Member] | 30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		34
Home Equity/2nds[Member] | 60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Home Equity/2nds[Member] | 90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	458		2,174
Consumer [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		4
Current	1,118		1,206
Total loans	1,118	$ 1,209	1,210
Non-accrual	0		0
Consumer [Member] | 30 to 59 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		4
Consumer [Member] | 60 to 89 Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	0		0
Consumer [Member] | 90+ Days Past Due [Member]
Classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans [Abstract]
Total past due	$ 0		$ 0