Loans, Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Impaired loan with no allocated allowance [Abstract]
TDR	$ 587		$ 587		$ 349
Non - TDR	2,555		2,555		175
Impaired loans with an allocated allowance [Abstract]
TDR - allowance based on collateral	2,638		2,638		2,482
TDR - allowance based on present value cash flow	58,237		58,237		62,113
Non - TDR - allowance based on collateral	90		90		148
Total impaired loans	64,107		64,107		65,267
Amount of allowance for loan losses allocated [Abstract]
TDR - allowance based on collateral	884		884		684
TDR - allowance based on present value cash flow	5,383		5,383		6,089
Non - TDR - allowance based on collateral	40		40		66
Total amount of allowance for loan losses allocated	6,307		6,307		6,839
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	3,145		3,145		527
Unpaid Principal Balance, with no related allowance	3,948		3,948		1,087
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	61,245		61,245		65,017
Unpaid Principal Balance, with an allowance recorded	62,778		62,778		67,289
Recorded Investment	64,390		64,390		65,544
Unpaid Principal Balance	66,726		66,726		68,376
Related Allowance	6,307		6,307		6,839
Accrued interest included in recorded investment	283		283		277
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	1,849	$ 489	1,408	$ 1,289
Interest Income Recognized, with No Related Allowance	15	15	27	20
Average Recorded Investment, with Related Allowance	62,383	72,193	63,260	73,774
Interest Income Recognized, with Related Allowance	747	866	1,538	1,714
Average Recorded Investment	64,232	72,682	64,668	75,063
Interest Income Recognized	762	881	1,565	1,734
Commercial [Member] | Income Producing - Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	0		0		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	5,106		5,106		5,195
Unpaid Principal Balance, with an allowance recorded	5,087		5,087		5,347
Recorded Investment	5,106		5,106		5,195
Unpaid Principal Balance	5,087		5,087		5,347
Related Allowance	335		335		347
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	185	0	296
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	5,142	7,694	5,160	7,708
Interest Income Recognized, with Related Allowance	70	104	138	209
Average Recorded Investment	5,142	7,879	5,160	8,004
Interest Income Recognized	70	104	138	209
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	2,402		2,402		0
Unpaid Principal Balance, with no related allowance	2,402		2,402		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	154		154		166
Unpaid Principal Balance, with an allowance recorded	153		153		194
Recorded Investment	2,556		2,556		166
Unpaid Principal Balance	2,555		2,555		194
Related Allowance	5		5		9
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	1,201	0	801	10
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	155	170	159	193
Interest Income Recognized, with Related Allowance	2	2	4	4
Average Recorded Investment	1,356	170	960	203
Interest Income Recognized	2	2	4	4
Commercial [Member] | Commercial and Industrial [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	502		502		524
Unpaid Principal Balance, with no related allowance	533		533		549
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	2,544		2,544		2,535
Unpaid Principal Balance, with an allowance recorded	2,629		2,629		2,651
Recorded Investment	3,046		3,046		3,059
Unpaid Principal Balance	3,162		3,162		3,200
Related Allowance	432		432		481
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	509	177	514	898
Interest Income Recognized, with No Related Allowance	9	8	13	8
Average Recorded Investment, with Related Allowance	2,522	3,237	2,526	3,792
Interest Income Recognized, with Related Allowance	34	37	66	72
Average Recorded Investment	3,031	3,414	3,040	4,690
Interest Income Recognized	43	45	79	80
Mortgage [Member] | 1-4 Family [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	240		240		2
Unpaid Principal Balance, with no related allowance	871		871		469
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	34,805		34,805		36,848
Unpaid Principal Balance, with an allowance recorded	36,076		36,076		38,480
Recorded Investment	35,045		35,045		36,850
Unpaid Principal Balance	36,947		36,947		38,949
Related Allowance	3,103		3,103		3,454
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	138	126	92	85
Interest Income Recognized, with No Related Allowance	3	5	9	9
Average Recorded Investment, with Related Allowance	35,345	39,646	35,846	40,331
Interest Income Recognized, with Related Allowance	431	494	889	958
Average Recorded Investment	35,483	39,772	35,938	40,416
Interest Income Recognized	434	499	898	967
Mortgage [Member] | Resort Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	0		0		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	14,617		14,617		15,978
Unpaid Principal Balance, with an allowance recorded	14,649		14,649		16,046
Recorded Investment	14,617		14,617		15,978
Unpaid Principal Balance	14,649		14,649		16,046
Related Allowance	2,186		2,186		2,210
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	15,098	16,471	15,391	16,613
Interest Income Recognized, with Related Allowance	150	150	314	311
Average Recorded Investment	15,098	16,471	15,391	16,613
Interest Income Recognized	150	150	314	311
Mortgage [Member] | Home Equity - 1st Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	0		0		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	67		67		173
Unpaid Principal Balance, with an allowance recorded	66		66		236
Recorded Investment	67		67		173
Unpaid Principal Balance	66		66		236
Related Allowance	4		4		43
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	111	232	131	233
Interest Income Recognized, with Related Allowance	1	2	3	4
Average Recorded Investment	111	232	131	233
Interest Income Recognized	1	2	3	4
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	34		34		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	157		157		178
Unpaid Principal Balance, with an allowance recorded	156		156		213
Recorded Investment	157		157		178
Unpaid Principal Balance	190		190		213
Related Allowance	9		9		18
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	167	186	171	229
Interest Income Recognized, with Related Allowance	1	1	3	3
Average Recorded Investment	167	186	171	229
Interest Income Recognized	1	1	3	3
Installment [Member] | Home Equity - 1st Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	1		1		1
Unpaid Principal Balance, with no related allowance	92		92		69
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	1,569		1,569		1,667
Unpaid Principal Balance, with an allowance recorded	1,687		1,687		1,804
Recorded Investment	1,570		1,570		1,668
Unpaid Principal Balance	1,779		1,779		1,873
Related Allowance	94		94		108
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	1	1	1	0
Interest Income Recognized, with No Related Allowance	2	2	4	3
Average Recorded Investment, with Related Allowance	1,596	1,855	1,619	1,901
Interest Income Recognized, with Related Allowance	25	33	54	67
Average Recorded Investment	1,597	1,856	1,620	1,901
Interest Income Recognized	27	35	58	70
Installment [Member] | Home Equity - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	0		0		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	1,731		1,731		1,793
Unpaid Principal Balance, with an allowance recorded	1,750		1,750		1,805
Recorded Investment	1,731		1,731		1,793
Unpaid Principal Balance	1,750		1,750		1,805
Related Allowance	112		112		140
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	1,746	2,228	1,762	2,290
Interest Income Recognized, with Related Allowance	25	35	52	70
Average Recorded Investment	1,746	2,228	1,762	2,290
Interest Income Recognized	25	35	52	70
Installment [Member] | Boat Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	0		0		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	1		1		1
Unpaid Principal Balance, with an allowance recorded	5		5		5
Recorded Investment	1		1		1
Unpaid Principal Balance	5		5		5
Related Allowance	1		1		1
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	1	1	1	1
Interest Income Recognized, with Related Allowance	0	0	0	0
Average Recorded Investment	1	1	1	1
Interest Income Recognized	0	0	0	0
Installment [Member] | Recreational Vehicle Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	0		0		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	85		85		90
Unpaid Principal Balance, with an allowance recorded	85		85		90
Recorded Investment	85		85		90
Unpaid Principal Balance	85		85		90
Related Allowance	4		4		5
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	0	0	0	0
Average Recorded Investment, with Related Allowance	86	104	87	106
Interest Income Recognized, with Related Allowance	1	2	2	3
Average Recorded Investment	86	104	87	106
Interest Income Recognized	1	2	2	3
Installment [Member] | Other [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	0		0		0
Unpaid Principal Balance, with no related allowance	16		16		0
With no related allowance recorded	0		0		0
Recorded Investment, with an allowance recorded	409		409		393
Unpaid Principal Balance, with an allowance recorded	435		435		418
Recorded Investment	409		409		393
Unpaid Principal Balance	451		451		418
Related Allowance	22		22		$ 23
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	0	0	0	0
Interest Income Recognized, with No Related Allowance	1	0	1	0
Average Recorded Investment, with Related Allowance	414	369	407	377
Interest Income Recognized, with Related Allowance	7	6	13	13
Average Recorded Investment	414	369	407	377
Interest Income Recognized	$ 8	$ 6	$ 14	$ 13