Loans, Receivables Past Due (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Non performing loans [Abstract]
90+ and Still Accruing		$ 0	$ 5
Non-Accrual		7,363	9,029
Total Non-performing Loans		7,363	9,034
Accrued interest included in recorded investment		0	0
Aging analysis of loans by class [Abstract]
Total		12,443	12,795
Loans not Past Due		2,703,221	2,578,263
Total loans recorded investment		2,715,664	2,591,058
Accrued interest included in recorded investment		9,138	8,538
Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		6,634	4,960
Accrued interest included in recorded investment		66	44
Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		2,361	820
Accrued interest included in recorded investment		32	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		3,448	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		98	55
Loans Not Past Due [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		9,040	8,483
Commercial [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment		3,394	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		50	44
Loans not Past Due		398,697	388,729
Total loans recorded investment		398,747	388,773
Commercial [Member] | Income Producing - Real Estate [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		50	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		0	0
Total Non-performing Loans		0	0
Aging analysis of loans by class [Abstract]
Total		0	0
Loans not Past Due		93,213	84,458
Total loans recorded investment		93,213	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		803	2,220
Total Non-performing Loans		803	2,220
Aging analysis of loans by class [Abstract]
Total		874	1,538
Loans not Past Due		686,530	673,123
Total loans recorded investment		687,404	674,661
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		132	1,538
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		37	0
Commercial [Member] | Commercial and Industrial [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		705	0
Mortgage [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment	[1]	4,550	4,097
Mortgage [Member] | 1-4 Family [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	5
Non-Accrual		4,142	4,695
Total Non-performing Loans		4,142	4,700
Aging analysis of loans by class [Abstract]
Total		7,885	6,684
Loans not Past Due		851,775	833,760
Total loans recorded investment		859,660	840,444
Accrued interest included in recorded investment	[1]	3,503	3,079
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		4,488	1,608
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		1,663	194
Mortgage [Member] | 1-4 Family [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		1,734	4,882
Mortgage [Member] | Resort Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		720	755
Total Non-performing Loans		720	755
Aging analysis of loans by class [Abstract]
Total		1,155	1,007
Loans not Past Due		73,578	80,774
Total loans recorded investment		74,733	81,781
Accrued interest included in recorded investment	[1]	367	363
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		484	252
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		238	0
Mortgage [Member] | Resort Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		433	755
Mortgage [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		196	159
Total Non-performing Loans		196	159
Aging analysis of loans by class [Abstract]
Total		325	335
Loans not Past Due		36,201	38,909
Total loans recorded investment		36,526	39,244
Accrued interest included in recorded investment	[1]	176	199
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		178	176
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		96	0
Mortgage [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		51	159
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		600	419
Total Non-performing Loans		600	419
Aging analysis of loans by class [Abstract]
Total		887	965
Loans not Past Due		119,053	84,553
Total loans recorded investment		119,940	85,518
Accrued interest included in recorded investment	[1]	504	456
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		458	446
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		234	100
Mortgage [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		195	419
Installment [Member]
Aging analysis of loans by class [Abstract]
Accrued interest included in recorded investment	[1]	1,194	1,030
Installment [Member] | Home Equity - 1st Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		168	178
Total Non-performing Loans		168	178
Aging analysis of loans by class [Abstract]
Total		109	452
Loans not Past Due		6,320	6,985
Total loans recorded investment		6,429	7,437
Accrued interest included in recorded investment	[1]	23	28
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		97	200
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		1	55
Installment [Member] | Home Equity - 1st Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		11	197
Installment [Member] | Home Equity - 2nd Lien [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		220	226
Total Non-performing Loans		220	226
Aging analysis of loans by class [Abstract]
Total		320	361
Loans not Past Due		5,431	6,683
Total loans recorded investment		5,751	7,044
Accrued interest included in recorded investment	[1]	19	25
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		188	111
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		19	24
Installment [Member] | Home Equity - 2nd Lien [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		113	226
Installment [Member] | Boat Lending [Member]
Non performing loans [Abstract]
90+ and Still Accruing		0	0
Non-Accrual		278	166
Total Non-performing Loans		278	166
Aging analysis of loans by class [Abstract]
Total		343	777
Loans not Past Due		197,315	169,117
Total loans recorded investment		197,658	169,894
Accrued interest included in recorded investment	[1]	493	403
Installment [Member] | Boat Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		287	316
Installment [Member] | Boat Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		24	295
Installment [Member] | Boat Lending [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		32	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		77	56
Loans not Past Due		144,403	125,780
Total loans recorded investment		144,480	125,836
Accrued interest included in recorded investment	[1]	368	311
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		72	28
Installment [Member] | Recreational Vehicle Lending [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		3	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		234	204
Total Non-performing Loans		234	204
Aging analysis of loans by class [Abstract]
Total		418	576
Loans not Past Due		90,705	85,392
Total loans recorded investment		91,123	85,968
Accrued interest included in recorded investment	[1]	291	263
Installment [Member] | Other [Member] | Loans Past Due, 30-59 days [Member]
Aging analysis of loans by class [Abstract]
Total		200	241
Installment [Member] | Other [Member] | Loans Past Due, 60-89 days [Member]
Aging analysis of loans by class [Abstract]
Total		46	131
Installment [Member] | Other [Member] | Loans Past Due, 90+ days [Member]
Aging analysis of loans by class [Abstract]
Total		$ 172	$ 204

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