Loans, Loan Ratings by Loan Class, Commercial Segment (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Loan ratings/credit scores by loan class [Abstract]
Commercial		$ 815,484	$ 804,017
Accrued interest included in total		5,107	5,113
Other Real Estate and Foreclosed Assets [Abstract]
Foreclosed residential real estate properties		2,200	1,900
Retail mortgage loans in process of foreclosure		1,100	1,000
Commercial [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		817,456	805,995
Accrued interest included in total		1,972	1,978
Commercial [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		799,604	783,854
Accrued interest included in total		1,912	1,915
Commercial [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		13,260	13,642
Accrued interest included in total		45	52
Commercial [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		3,267	3,335
Accrued interest included in total		15	11
Commercial [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		1,325	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		282,045	287,638
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		277,648	282,886
Commercial [Member] | Income Producing - Real Estate [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		3,407	3,787
Commercial [Member] | Income Producing - Real Estate [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		411	337
Commercial [Member] | Income Producing - Real Estate [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		579	628
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		53,649	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		53,578	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		67	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		4	105
Commercial [Member] | Commercial and Industrial [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		481,762	466,582
Commercial [Member] | Commercial and Industrial [Member] | Non-Watch 1-6 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		468,378	449,365
Commercial [Member] | Commercial and Industrial [Member] | Watch 7-8 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		9,786	9,788
Commercial [Member] | Commercial and Industrial [Member] | Substandard Accrual 9 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		2,856	2,998
Commercial [Member] | Commercial and Industrial [Member] | Non-Accrual 10-11 [Member]
Loan ratings/credit scores by loan class [Abstract]
Commercial		742	4,431
Mortgage [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	72,258	69,920
750-799	[1]	213,475	195,484
700-749	[1]	135,884	121,245
650-699	[1]	83,908	77,129
600-649	[1]	36,334	35,780
550-599	[1]	18,293	18,931
500-549	[1]	11,657	12,120
Under 500	[1]	5,599	5,771
Unknown	[1]	5,986	4,599
Total	[1]	583,394	540,979
Accrued interest included in total	[1]	2,364	2,364
Mortgage [Member] | 1-4 Family [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	38,929	36,534
750-799	[1]	124,778	102,382
700-749	[1]	86,342	69,337
650-699	[1]	58,861	50,621
600-649	[1]	26,474	25,270
550-599	[1]	13,199	13,747
500-549	[1]	8,815	9,215
Under 500	[1]	4,976	5,145
Unknown	[1]	3,212	2,290
Total	[1]	365,586	314,541
Accrued interest included in total	[1]	1,535	1,466
Mortgage [Member] | Resort Lending [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	10,347	10,484
750-799	[1]	40,569	41,999
700-749	[1]	24,152	24,727
650-699	[1]	13,542	13,798
600-649	[1]	5,143	5,769
550-599	[1]	3,006	3,030
500-549	[1]	1,397	1,438
Under 500	[1]	91	92
Unknown	[1]	1,696	1,711
Total	[1]	99,943	103,048
Accrued interest included in total	[1]	381	450
Mortgage [Member] | Home Equity - 1st Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	6,716	6,048
750-799	[1]	10,926	10,006
700-749	[1]	6,176	5,706
650-699	[1]	4,012	4,106
600-649	[1]	1,602	1,674
550-599	[1]	453	455
500-549	[1]	482	486
Under 500	[1]	256	255
Unknown	[1]	314	280
Total	[1]	30,937	29,016
Accrued interest included in total	[1]	123	111
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	7,846	8,392
750-799	[1]	16,893	20,113
700-749	[1]	10,568	12,360
650-699	[1]	7,058	8,167
600-649	[1]	3,115	3,067
550-599	[1]	1,635	1,699
500-549	[1]	963	981
Under 500	[1]	276	279
Unknown	[1]	633	179
Total	[1]	48,987	55,237
Accrued interest included in total	[1]	213	226
Mortgage [Member] | Purchased Loans [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	8,420	8,462
750-799	[1]	20,309	20,984
700-749	[1]	8,646	9,115
650-699	[1]	435	437
600-649	[1]	0	0
550-599	[1]	0	0
500-549	[1]	0	0
Under 500	[1]	0	0
Unknown	[1]	131	139
Total	[1]	37,941	39,137
Accrued interest included in total	[1]	112	111
Installment [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	56,075	56,347
750-799	[1]	121,196	114,065
700-749	[1]	51,364	48,883
650-699	[1]	24,965	25,070
600-649	[1]	7,781	8,402
550-599	[1]	3,974	4,289
500-549	[1]	2,457	2,813
Under 500	[1]	552	634
Unknown	[1]	6,640	5,884
Total	[1]	275,004	266,387
Accrued interest included in total	[1]	771	771
Installment [Member] | Home Equity - 1st Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	1,235	1,354
750-799	[1]	2,340	2,478
700-749	[1]	1,766	1,920
650-699	[1]	2,731	2,852
600-649	[1]	1,611	1,691
550-599	[1]	1,160	1,231
500-549	[1]	887	981
Under 500	[1]	110	114
Unknown	[1]	28	29
Total	[1]	11,868	12,650
Accrued interest included in total	[1]	51	54
Installment [Member] | Home Equity - 2nd Lien [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	1,370	1,626
750-799	[1]	3,007	3,334
700-749	[1]	2,448	2,686
650-699	[1]	2,390	2,541
600-649	[1]	1,612	1,775
550-599	[1]	973	1,063
500-549	[1]	629	692
Under 500	[1]	214	220
Unknown	[1]	0	21
Total	[1]	12,643	13,958
Accrued interest included in total	[1]	52	59
Installment [Member] | Boat Lending [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	22,038	21,422
750-799	[1]	54,385	50,508
700-749	[1]	21,100	20,045
650-699	[1]	7,506	7,559
600-649	[1]	1,579	1,846
550-599	[1]	813	882
500-549	[1]	343	440
Under 500	[1]	56	73
Unknown	[1]	223	150
Total	[1]	108,043	102,925
Accrued interest included in total	[1]	267	264
Installment [Member] | Recreational Vehicle Lending [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	22,843	23,034
750-799	[1]	39,161	35,827
700-749	[1]	11,977	11,049
650-699	[1]	3,433	3,205
600-649	[1]	781	821
550-599	[1]	251	280
500-549	[1]	181	189
Under 500	[1]	16	16
Unknown	[1]	125	114
Total	[1]	78,768	74,535
Accrued interest included in total	[1]	205	203
Installment [Member] | Other [Member]
Loan ratings/credit scores by loan class [Abstract]
800 and above	[1]	8,589	8,911
750-799	[1]	22,303	21,918
700-749	[1]	14,073	13,183
650-699	[1]	8,905	8,913
600-649	[1]	2,198	2,269
550-599	[1]	777	833
500-549	[1]	417	511
Under 500	[1]	156	211
Unknown	[1]	6,264	5,570
Total	[1]	63,682	62,319
Accrued interest included in total	[1]	$ 196	$ 191

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