Loans and Allowance (Age Analysis of Past Due Loans Segregated by Class of Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 18,056	$ 28,022
Current	1,485,880	1,469,234
Total loans receivable	1,503,936	1,497,256	$ 1,452,461
Total Loans > 90 Days or More and Accruing	206	517
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,120	17,091
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,904	3,023
90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,032	7,908
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,455	6,058
Current	479,172	479,750
Total loans receivable	482,627	485,808
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,095	1,145
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	462	536
Commercial Real Estate [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	898	4,377
Commercial Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,137	4,694
Current	59,246	48,616
Total loans receivable	60,383	53,310
Commercial Segment [Member] | Construction Loans [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,137	4,633
Commercial Segment [Member] | Construction Loans [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		61
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	462	801
Current	151,334	148,558
Total loans receivable	151,796	149,359
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	137	617
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	58	93
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	267	91
Consumer [Member] | First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,097	12,205
Current	449,401	452,334
Total loans receivable	458,498	464,539
Total Loans > 90 Days or More and Accruing	206	517
Consumer [Member] | First Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,181	7,847
Consumer [Member] | First Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,874	1,662
Consumer [Member] | First Mortgage [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,042	2,696
Consumer [Member] | Second Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	434	687
Current	72,912	76,385
Total loans receivable	73,346	77,072
Consumer [Member] | Second Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	210	353
Consumer [Member] | Second Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	65	114
Consumer [Member] | Second Mortgage [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	159	220
Consumer [Member] | Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	273	345
Current	52,223	43,322
Total loans receivable	52,496	43,667
Consumer [Member] | Automobile Loan [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	125	257
Consumer [Member] | Automobile Loan [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	91	16
Consumer [Member] | Automobile Loan [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	57	72
Consumer [Member] | Boat/RVs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,121	3,118
Current	215,054	213,490
Total loans receivable	218,175	216,608
Consumer [Member] | Boat/RVs [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,207	2,174
Consumer [Member] | Boat/RVs [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	342	594
Consumer [Member] | Boat/RVs [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	572	350
Consumer [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	77	114
Current	6,538	6,779
Total loans receivable	6,615	6,893
Consumer [Member] | Other [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28	65
Consumer [Member] | Other [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12	8
Consumer [Member] | Other [Member] | 90 Days Past Due or More [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 37	$ 41