Loans, Receivables Past Due (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Non performing loans [Abstract]
90+ and Still Accruing		$ 0	$ 5
Non-Accrual		6,649	8,569
Total Non-performing Loans		6,649	8,574
Accrued interest included in recorded investment		0	0
Aging analysis of loans by class [Abstract]
Total		10,229	12,795
Loans not Past Due		2,720,653	2,578,263
Total loans recorded investment		2,730,882	2,591,058
Accrued interest included in recorded investment		8,436	8,538
Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		6,331	4,960
Accrued interest included in recorded investment		65	44
Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		1,714	820
Accrued interest included in recorded investment		17	11
Loans Past Due, 90+ days [Member]
Non performing loans [Abstract]
Accrued interest included in recorded investment		0	0
Aging analysis of loans by class [Abstract]
Total		2,184	7,015
Accrued interest included in recorded investment		0	0
Loans Past Due Total [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		82	55
Loans Not Past Due [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		8,354	8,483
Commercial [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		3,005	3,411
Commercial [Member] | Income Producing - Real Estate [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		0	0
Total Non-performing Loans		0	0
Aging analysis of loans by class [Abstract]
Total		44	44
Loans not Past Due		424,472	388,729
Total loans recorded investment		424,516	388,773
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		44	44
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		654	0
Total Non-performing Loans		654	0
Aging analysis of loans by class [Abstract]
Total		0	0
Loans not Past Due		102,227	84,458
Total loans recorded investment		102,227	84,458
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Commercial [Member] | Commercial and Industrial [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		87	2,123
Total Non-performing Loans		87	2,123
Aging analysis of loans by class [Abstract]
Total		509	1,538
Loans not Past Due		664,770	673,123
Total loans recorded investment		665,279	674,661
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		483	1,538
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		26	0
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		0	0
Mortgage [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment	[1]	4,300	4,097
Mortgage [Member] | 1-4 Family [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	5
Non-Accrual		3,873	4,332
Total Non-performing Loans		3,873	4,337
Aging analysis of loans by class [Abstract]
Total		5,430	6,684
Loans not Past Due		841,658	833,760
Total loans recorded investment		847,088	840,444
Accrued interest included in recorded investment	[1]	3,327	3,079
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		3,098	1,608
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		973	194
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		1,359	4,882
Mortgage [Member] | Resort Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		227	755
Total Non-performing Loans		227	755
Aging analysis of loans by class [Abstract]
Total		877	1,007
Loans not Past Due		69,949	80,774
Total loans recorded investment		70,826	81,781
Accrued interest included in recorded investment	[1]	343	363
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		703	252
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		81	0
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		93	755
Mortgage [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		208	159
Total Non-performing Loans		208	159
Aging analysis of loans by class [Abstract]
Total		267	335
Loans not Past Due		37,069	38,909
Total loans recorded investment		37,336	39,244
Accrued interest included in recorded investment	[1]	166	199
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		87	176
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		101	0
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		79	159
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		665	419
Total Non-performing Loans		665	419
Aging analysis of loans by class [Abstract]
Total		1,340	965
Loans not Past Due		117,745	84,553
Total loans recorded investment		119,085	85,518
Accrued interest included in recorded investment	[1]	464	456
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		765	446
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		344	100
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		231	419
Installment [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment	[1]	1,131	1,030
Installment [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		125	178
Total Non-performing Loans		125	178
Aging analysis of loans by class [Abstract]
Total		112	452
Loans not Past Due		5,871	6,985
Total loans recorded investment		5,983	7,437
Accrued interest included in recorded investment	[1]	21	28
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		83	200
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		19	55
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		10	197
Installment [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		269	226
Total Non-performing Loans		269	226
Aging analysis of loans by class [Abstract]
Total		287	361
Loans not Past Due		4,832	6,683
Total loans recorded investment		5,119	7,044
Accrued interest included in recorded investment	[1]	16	25
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		118	111
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		3	24
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		166	226
Installment [Member] | Boat Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		378	166
Total Non-performing Loans		378	166
Aging analysis of loans by class [Abstract]
Total		814	777
Loans not Past Due		205,526	169,117
Total loans recorded investment		206,340	169,894
Accrued interest included in recorded investment	[1]	467	403
Installment [Member] | Boat Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		625	316
Installment [Member] | Boat Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		49	295
Installment [Member] | Boat Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		140	166
Installment [Member] | Recreational Vehicle Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		2	7
Total Non-performing Loans		2	7
Aging analysis of loans by class [Abstract]
Total		127	56
Loans not Past Due		152,904	125,780
Total loans recorded investment		153,031	125,836
Accrued interest included in recorded investment	[1]	350	311
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		92	28
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		33	21
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		2	7
Installment [Member] | Other [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		161	204
Total Non-performing Loans		161	204
Aging analysis of loans by class [Abstract]
Total		422	576
Loans not Past Due		93,630	85,392
Total loans recorded investment		94,052	85,968
Accrued interest included in recorded investment	[1]	277	263
Installment [Member] | Other [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		233	241
Installment [Member] | Other [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		85	131
Installment [Member] | Other [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		$ 104	$ 204

[1] Credit scores have been updated within the last twelve months.