Loans (Loan Receivable and Allowance Balances Disaggregated) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loan receivables:
Ending balance: individually evaluated for impairment	$ 35,548		$ 43,254	$ 32,700
Ending balance: collectively evaluated for impairment	1,268,678		1,106,790	1,112,706
Total Loan Receivables	1,307,737		1,150,044	1,145,406
Allowance for loan losses:
Ending balance: individually evaluated for impairment	1,010		1,024	818
Ending balance: collectively evaluated for impairment	9,729		9,491	9,617
Total Allowance for loan losses	10,739	$ 10,725	10,515	10,435	$ 10,434	$ 9,860
Commercial Real Estate Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	26,225		32,929	24,035
Ending balance: collectively evaluated for impairment	820,257		694,385	688,805
Total Loan Receivables	847,945		727,314	712,840
Allowance for loan losses:
Ending balance: individually evaluated for impairment	174		370	155
Ending balance: collectively evaluated for impairment	6,538		6,081	6,153
Total Allowance for loan losses	6,712	6,563	6,451	6,308	6,085	5,212
Residential First Mortgage Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,616		2,437	2,271
Ending balance: collectively evaluated for impairment	153,481		167,937	173,545
Total Loan Receivables	156,565		170,374	175,816
Allowance for loan losses:
Ending balance: individually evaluated for impairment			2	7
Ending balance: collectively evaluated for impairment	691		1,142	1,250
Total Allowance for loan losses	691	737	1,144	1,257	1,300	1,406
Residential Rentals Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	1,377		2,376	2,668
Ending balance: collectively evaluated for impairment	122,745		107,852	108,237
Total Loan Receivables	125,383		110,228	110,905
Allowance for loan losses:
Ending balance: individually evaluated for impairment			18	21
Ending balance: collectively evaluated for impairment	585		494	603
Total Allowance for loan losses	585	469	512	624	335	362
Construction And Land Development Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	729		729	729
Ending balance: collectively evaluated for impairment	28,059		27,142	30,365
Total Loan Receivables	28,788		27,871	31,094
Allowance for loan losses:
Ending balance: individually evaluated for impairment			163	163
Ending balance: collectively evaluated for impairment	295		299	483
Total Allowance for loan losses	295	498	462	646	720	941
Home Equity And Second Mortgage Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	293		317	225
Ending balance: collectively evaluated for impairment	35,748		21,034	22,109
Total Loan Receivables	36,360		21,351	22,334
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	177		162	128
Total Allowance for loan losses	177	104	162	128	112	138
Commercial Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,773		2,951	2,265
Ending balance: collectively evaluated for impairment	59,310		53,466	54,111
Total Loan Receivables	62,083		56,417	56,376
Allowance for loan losses:
Ending balance: individually evaluated for impairment	458		168	169
Ending balance: collectively evaluated for impairment	756		845	622
Total Allowance for loan losses	1,214	1,203	1,013	791	814	794
Consumer Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	1
Ending balance: collectively evaluated for impairment	729		573	541
Total Loan Receivables	730		573	541
Allowance for loan losses:
Ending balance: individually evaluated for impairment	1
Ending balance: collectively evaluated for impairment	4		7	7
Total Allowance for loan losses	5	7	7	7	5	3
Commercial Equipment Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	1,534		1,515	507
Ending balance: collectively evaluated for impairment	48,349		34,401	34,993
Total Loan Receivables	49,883		35,916	35,500
Allowance for loan losses:
Ending balance: individually evaluated for impairment	377		303	303
Ending balance: collectively evaluated for impairment	683		461	371
Total Allowance for loan losses	1,060	$ 1,144	764	$ 674	$ 1,063	$ 1,004
Commercial Portfolio Segment [Member]
Loan receivables:
Total Loan Receivables	1,114,082		$ 957,746
PCI Loans [Member]
Loan receivables:
Total Loan Receivables	3,511
PCI Loans [Member] | Commercial Real Estate Loans [Member]
Loan receivables:
Total Loan Receivables	1,463
PCI Loans [Member] | Residential First Mortgage Loans [Member]
Loan receivables:
Total Loan Receivables	468
PCI Loans [Member] | Residential Rentals Loans [Member]
Loan receivables:
Total Loan Receivables	1,261
PCI Loans [Member] | Home Equity And Second Mortgage Loans [Member]
Loan receivables:
Total Loan Receivables	319
All Other Loans [Member]
Loan receivables:
Total Loan Receivables	1,304,226
All Other Loans [Member] | Commercial Real Estate Loans [Member]
Loan receivables:
Total Loan Receivables	846,482
All Other Loans [Member] | Residential First Mortgage Loans [Member]
Loan receivables:
Total Loan Receivables	156,097
All Other Loans [Member] | Residential Rentals Loans [Member]
Loan receivables:
Total Loan Receivables	124,122
All Other Loans [Member] | Construction And Land Development Loans [Member]
Loan receivables:
Total Loan Receivables	28,788
All Other Loans [Member] | Home Equity And Second Mortgage Loans [Member]
Loan receivables:
Total Loan Receivables	36,041
All Other Loans [Member] | Commercial Loans [Member]
Loan receivables:
Total Loan Receivables	62,083
All Other Loans [Member] | Consumer Loans [Member]
Loan receivables:
Total Loan Receivables	730
All Other Loans [Member] | Commercial Equipment Loans [Member]
Loan receivables:
Total Loan Receivables	$ 49,883