Loans and Allowance (Age Analysis of Past Due Loans Segregated by Class of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 20,618	$ 17,473
Current	1,166,095	1,155,163
Total loans receivable	1,186,713	1,172,636	$ 1,083,395
Total Loans > 90 Days or More and Accruing	31	237
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,693	10,220
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,164	2,250
90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,761	5,003
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,480	1,781
Current	312,204	300,796
Total loans receivable	318,684	302,577
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,171	854
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,311	142
Commercial Real Estate [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	998	785
Commercial Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	28,164	22,453
Total loans receivable	28,164	22,453
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	445	537
Current	130,634	130,566
Total loans receivable	131,079	131,103
Commercial Segment [Member] | Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	276	497
Commercial Segment [Member] | Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10	32
Commercial Segment [Member] | Commercial and Industrial [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	159	8
Consumer [Member] | First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,478	12,018
Current	433,765	466,830
Total loans receivable	444,243	478,848
Total Loans > 90 Days or More and Accruing	31	237
Consumer [Member] | First Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,914	6,789
Consumer [Member] | First Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,340	1,554
Consumer [Member] | First Mortgage [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,224	3,675
Consumer [Member] | Second Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	927	982
Current	68,550	70,240
Total loans receivable	69,477	71,222
Consumer [Member] | Second Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	540	512
Consumer [Member] | Second Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	123	166
Consumer [Member] | Second Mortgage [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	264	304
Consumer [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	139	133
Current	19,501	18,806
Total loans receivable	19,640	18,939
Consumer [Member] | Automobile Loan [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	114	103
Consumer [Member] | Automobile Loan [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	24	25
Consumer [Member] | Automobile Loan [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1	5
Consumer [Member] | Boat/RVs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,054	1,894
Current	167,184	139,708
Total loans receivable	169,238	141,602
Consumer [Member] | Boat/RVs [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,613	1,376
Consumer [Member] | Boat/RVs [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	338	305
Consumer [Member] | Boat/RVs [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	103	213
Consumer [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	95	128
Current	6,093	5,764
Total loans receivable	6,188	5,892
Consumer [Member] | Other [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	65	89
Consumer [Member] | Other [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18	26
Consumer [Member] | Other [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 12	$ 13