Loans, Loan Ratings by Loan Class, Commercial, Mortgage and Installment Segments (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Loan ratings/credit scores by loan class [Abstract]
Commercial		$ 837,250	$ 804,017
Accrued interest included in total		5,969	5,113
Other Real Estate and Foreclosed Assets [Abstract]
Foreclosed residential real estate properties		1,700	1,900
Retail mortgage loans in process of foreclosure		1,200	1,000
Commercial [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		839,330	805,995
Accrued interest included in total		2,080	1,978
Commercial [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		810,533	783,854
Accrued interest included in total		1,991	1,915
Commercial [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		25,317	13,642
Accrued interest included in total		80	52
Commercial [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		2,692	3,335
Accrued interest included in total		9	11
Commercial [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		788	5,164
Accrued interest included in total		0	0
Commercial [Member] | Income Producing - Real Estate [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		272,202	287,638
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		268,781	282,886
Commercial [Member] | Income Producing - Real Estate [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		3,037	3,787
Commercial [Member] | Income Producing - Real Estate [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		312	337
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		72	628
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		67,803	51,775
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		67,730	51,603
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		63	67
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		0	0
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		10	105
Commercial [Member] | Commercial and Industrial [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		499,325	466,582
Commercial [Member] | Commercial and Industrial [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		474,022	449,365
Commercial [Member] | Commercial and Industrial [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		22,217	9,788
Commercial [Member] | Commercial and Industrial [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		2,380	2,998
Commercial [Member] | Commercial and Industrial [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		706	4,431
Mortgage [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	98,658	69,920
750-799	[1]	316,233	195,484
700-749	[1]	184,489	121,245
650-699	[1]	101,501	77,129
600-649	[1]	35,124	35,780
550-599	[1]	20,196	18,931
500-549	[1]	12,029	12,120
Under 500	[1]	4,203	5,771
Unknown	[1]	11,939	4,599
Total	[1]	784,372	540,979
Accrued interest included in total	[1]	3,026	2,364
Mortgage [Member] | 1-4 Family [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	62,145	36,534
750-799	[1]	227,676	102,382
700-749	[1]	130,480	69,337
650-699	[1]	77,357	50,621
600-649	[1]	26,947	25,270
550-599	[1]	15,547	13,747
500-549	[1]	8,766	9,215
Under 500	[1]	3,692	5,145
Unknown	[1]	9,373	2,290
Total	[1]	561,983	314,541
Accrued interest included in total	[1]	2,134	1,466
Mortgage [Member] | Resort Lending [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	11,336	10,484
750-799	[1]	33,287	41,999
700-749	[1]	25,629	24,727
650-699	[1]	12,441	13,798
600-649	[1]	4,648	5,769
550-599	[1]	2,777	3,030
500-549	[1]	1,404	1,438
Under 500	[1]	89	92
Unknown	[1]	1,668	1,711
Total	[1]	93,279	103,048
Accrued interest included in total	[1]	374	450
Mortgage [Member] | Home Equity - 1st Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	8,491	6,048
750-799	[1]	15,619	10,006
700-749	[1]	6,583	5,706
650-699	[1]	3,304	4,106
600-649	[1]	1,090	1,674
550-599	[1]	365	455
500-549	[1]	540	486
Under 500	[1]	253	255
Unknown	[1]	299	280
Total	[1]	36,544	29,016
Accrued interest included in total	[1]	165	111
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	8,896	8,392
750-799	[1]	21,092	20,113
700-749	[1]	13,819	12,360
650-699	[1]	7,970	8,167
600-649	[1]	2,439	3,067
550-599	[1]	1,507	1,699
500-549	[1]	1,319	981
Under 500	[1]	169	279
Unknown	[1]	479	179
Total	[1]	57,690	55,237
Accrued interest included in total	[1]	260	226
Mortgage [Member] | Purchased Loans [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	7,790	8,462
750-799	[1]	18,559	20,984
700-749	[1]	7,978	9,115
650-699	[1]	429	437
600-649	[1]	0	0
550-599	[1]	0	0
500-549	[1]	0	0
Under 500	[1]	0	0
Unknown	[1]	120	139
Total	[1]	34,876	39,137
Accrued interest included in total	[1]	93	111
Installment [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	65,089	56,347
750-799	[1]	146,790	114,065
700-749	[1]	60,476	48,883
650-699	[1]	25,838	25,070
600-649	[1]	7,760	8,402
550-599	[1]	3,777	4,289
500-549	[1]	1,816	2,813
Under 500	[1]	353	634
Unknown	[1]	7,462	5,884
Total	[1]	319,361	266,387
Accrued interest included in total	[1]	863	771
Installment [Member] | Home Equity - 1st Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	1,085	1,354
750-799	[1]	1,938	2,478
700-749	[1]	1,601	1,920
650-699	[1]	2,193	2,852
600-649	[1]	1,429	1,691
550-599	[1]	1,252	1,231
500-549	[1]	616	981
Under 500	[1]	92	114
Unknown	[1]	17	29
Total	[1]	10,223	12,650
Accrued interest included in total	[1]	42	54
Installment [Member] | Home Equity - 2nd Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	869	1,626
750-799	[1]	2,721	3,334
700-749	[1]	2,236	2,686
650-699	[1]	1,864	2,541
600-649	[1]	1,429	1,775
550-599	[1]	919	1,063
500-549	[1]	398	692
Under 500	[1]	56	220
Unknown	[1]	19	21
Total	[1]	10,511	13,958
Accrued interest included in total	[1]	44	59
Installment [Member] | Boat Lending [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	26,168	21,422
750-799	[1]	67,402	50,508
700-749	[1]	25,945	20,045
650-699	[1]	9,164	7,559
600-649	[1]	1,730	1,846
550-599	[1]	468	882
500-549	[1]	243	440
Under 500	[1]	64	73
Unknown	[1]	219	150
Total	[1]	131,403	102,925
Accrued interest included in total	[1]	322	264
Installment [Member] | Recreational Vehicle Lending [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	26,312	23,034
750-799	[1]	48,183	35,827
700-749	[1]	14,261	11,049
650-699	[1]	3,627	3,205
600-649	[1]	838	821
550-599	[1]	244	280
500-549	[1]	125	189
Under 500	[1]	11	16
Unknown	[1]	167	114
Total	[1]	93,768	74,535
Accrued interest included in total	[1]	236	203
Installment [Member] | Other [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	10,655	8,911
750-799	[1]	26,546	21,918
700-749	[1]	16,433	13,183
650-699	[1]	8,990	8,913
600-649	[1]	2,334	2,269
550-599	[1]	894	833
500-549	[1]	434	511
Under 500	[1]	130	211
Unknown	[1]	7,040	5,570
Total	[1]	73,456	62,319
Accrued interest included in total	[1]	$ 219	$ 191

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