Loans (Loan Receivable and Allowance Balances Disaggregated) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Loan receivables:
Ending balance: individually evaluated for impairment	$ 29,705		$ 35,360	$ 38,484
Ending balance: collectively evaluated for impairment	1,112,305		1,053,622	966,584
Total Loan Receivables	1,142,010		1,088,982	1,005,068
Allowance for loan losses:
Ending balance: individually evaluated for impairment	1,476		1,289	1,223
Ending balance: collectively evaluated for impairment	8,958		8,571	7,883
Total Allowance for loan losses	10,434	$ 10,109	9,860	9,106	$ 8,591	$ 8,540
Residential First Mortgage Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,291		2,413	2,957
Ending balance: collectively evaluated for impairment	179,095		168,591	145,181
Total Loan Receivables	181,386		171,004	148,138
Allowance for loan losses:
Ending balance: individually evaluated for impairment	11		7	20
Ending balance: collectively evaluated for impairment	1,289		1,399	915
Total Allowance for loan losses	1,300		1,406	935
Home Equity And Second Mortgage Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	109		170	109
Ending balance: collectively evaluated for impairment	20,738		21,229	21,995
Total Loan Receivables	20,847		21,399	22,104
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	112		138	141
Total Allowance for loan losses	112	76	138	141	134	142
Consumer Loans [Member]
Loan receivables:
Ending balance: collectively evaluated for impairment	412		422	332
Total Loan Receivables	412		422	332
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	5		3	2
Total Allowance for loan losses	5	5	3	2	1	2
Commercial Equipment Loans [Member]
Loan receivables:
Total Loan Receivables	34,589		39,737
Real Estate Portfolio Segment [Member] | Residential First Mortgage Loans [Member]
Allowance for loan losses:
Total Allowance for loan losses	1,300	1,428	1,406	935	591	584
Commercial Portfolio Segment [Member]
Loan receivables:
Total Loan Receivables	939,365		896,157
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	20,066		21,977	22,414
Ending balance: collectively evaluated for impairment	693,723		645,128	585,966
Total Loan Receivables	713,789		667,105	608,380
Allowance for loan losses:
Ending balance: individually evaluated for impairment	693		806	582
Ending balance: collectively evaluated for impairment	5,392		4,406	3,798
Total Allowance for loan losses	6,085	5,179	5,212	4,380	3,838	3,465
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,686		3,028	3,591
Ending balance: collectively evaluated for impairment	100,675		98,869	96,611
Total Loan Receivables	103,361		101,897	100,202
Allowance for loan losses:
Ending balance: individually evaluated for impairment	23		36	53
Ending balance: collectively evaluated for impairment	312		326	560
Total Allowance for loan losses	335	354	362	613	590	538
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	981		3,777	4,370
Ending balance: collectively evaluated for impairment	31,622		33,157	31,190
Total Loan Receivables	32,603		36,934	35,560
Allowance for loan losses:
Ending balance: individually evaluated for impairment	163		178	398
Ending balance: collectively evaluated for impairment	557		763	646
Total Allowance for loan losses	720	891	941	1,044	1,129	1,103
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,973		3,204	4,227
Ending balance: collectively evaluated for impairment	52,050		47,280	52,940
Total Loan Receivables	55,023		50,484	57,167
Allowance for loan losses:
Ending balance: individually evaluated for impairment	169		123	5
Ending balance: collectively evaluated for impairment	645		671	704
Total Allowance for loan losses	814	789	794	709	1,046	1,477
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	599		791	816
Ending balance: collectively evaluated for impairment	33,990		38,946	32,369
Total Loan Receivables	34,589		39,737	33,185
Allowance for loan losses:
Ending balance: individually evaluated for impairment	417		139	165
Ending balance: collectively evaluated for impairment	646		865	1,117
Total Allowance for loan losses	$ 1,063	$ 1,387	$ 1,004	$ 1,282	$ 1,262	$ 1,229