Loans, Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Impaired loans with no allocated allowance for loan losses [Abstract]
Troubled debt restructurings ("TDR")	$ 0		$ 0		$ 0
Non - TDR	1,144		1,144		0
Impaired loans with an allocated allowance for loan losses [Abstract]
TDR - allowance based on collateral	1,129		1,129		2,787
TDR - allowance based on present value cash flow	49,094		49,094		53,258
Non - TDR - allowance based on collateral	1,969		1,969		2,145
Total impaired loans	53,336		53,336		58,190
Amount of allowance for loan losses allocated [Abstract]
TDR - allowance based on collateral	230		230		769
TDR - allowance based on present value cash flow	4,865		4,865		4,849
Non - TDR - allowance based on collateral	683		683		692
Total amount of allowance for loan losses allocated	5,778		5,778		6,310
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	1,144		1,144		4
Unpaid Principal Balance, with no related allowance for loan losses recorded	1,552		1,552		616
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	52,445		52,445		58,457
Unpaid Principal Balance, with an allowance for loan losses recorded	55,192		55,192		60,282
Recorded Investment	53,589		53,589		58,461
Unpaid Principal Balance	56,744		56,744		60,898
Related Allowance	5,778		5,778		6,310
Accrued interest included in recorded investment	253		253		271
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	879	$ 2,949	529	$ 1,744
Interest Income Recognized, with no related allowance for loan losses recorded	13	17	15	44
Average Recorded Investment, with an allowance for loan losses recorded	53,636	60,330	55,786	62,299
Interest Income Recognized, with an allowance for loan losses recorded	740	770	2,213	2,308
Average Recorded Investment	54,515	63,279	56,315	64,043
Interest Income Recognized	753	787	2,228	2,352
Commercial [Member] | Income Producing - Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	5,859		5,859		4,770
Unpaid Principal Balance, with an allowance for loan losses recorded	5,837		5,837		4,758
Recorded Investment	5,859		5,859		4,770
Unpaid Principal Balance	5,837		5,837		4,758
Related Allowance	619		619		303
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	5,867	4,968	5,306	5,077
Interest Income Recognized, with an allowance for loan losses recorded	68	64	214	202
Average Recorded Investment	5,867	4,968	5,306	5,077
Interest Income Recognized	68	64	214	202
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	654		654		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	734		734		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	113		113		290
Unpaid Principal Balance, with an allowance for loan losses recorded	113		113		289
Recorded Investment	767		767		290
Unpaid Principal Balance	847		847		289
Related Allowance	25		25		35
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	327	2,402	164	1,201
Interest Income Recognized, with no related allowance for loan losses recorded	5	0	5	0
Average Recorded Investment, with an allowance for loan losses recorded	202	153	246	157
Interest Income Recognized, with an allowance for loan losses recorded	3	3	7	7
Average Recorded Investment	529	2,555	410	1,358
Interest Income Recognized	8	3	12	7
Commercial [Member] | Commercial and Industrial [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	1,150		1,150		3,637
Unpaid Principal Balance, with an allowance for loan losses recorded	1,244		1,244		3,735
Recorded Investment	1,150		1,150		3,637
Unpaid Principal Balance	1,244		1,244		3,735
Related Allowance	227		227		967
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	425	0	472
Interest Income Recognized, with no related allowance for loan losses recorded	0	7	0	20
Average Recorded Investment, with an allowance for loan losses recorded	1,534	2,264	2,406	2,391
Interest Income Recognized, with an allowance for loan losses recorded	16	24	52	90
Average Recorded Investment	1,534	2,689	2,406	2,863
Interest Income Recognized	16	31	52	110
Mortgage [Member] | 1-4 Family [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	490		490		3
Unpaid Principal Balance, with no related allowance for loan losses recorded	774		774		474
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	29,521		29,521		32,842
Unpaid Principal Balance, with an allowance for loan losses recorded	31,657		31,657		34,427
Recorded Investment	30,011		30,011		32,845
Unpaid Principal Balance	32,431		32,431		34,901
Related Allowance	3,164		3,164		2,859
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	552	121	365	70
Interest Income Recognized, with no related allowance for loan losses recorded	7	9	9	18
Average Recorded Investment, with an allowance for loan losses recorded	29,966	34,731	31,273	35,549
Interest Income Recognized, with an allowance for loan losses recorded	420	458	1,280	1,347
Average Recorded Investment	30,518	34,852	31,638	35,619
Interest Income Recognized	427	467	1,289	1,365
Mortgage [Member] | Resort Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	11,741		11,741		13,328
Unpaid Principal Balance, with an allowance for loan losses recorded	11,949		11,949		13,354
Recorded Investment	11,741		11,741		13,328
Unpaid Principal Balance	11,949		11,949		13,354
Related Allowance	1,197		1,197		1,927
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	12,067	14,276	12,607	15,027
Interest Income Recognized, with an allowance for loan losses recorded	171	161	493	475
Average Recorded Investment	12,067	14,276	12,607	15,027
Interest Income Recognized	171	161	493	475
Mortgage [Member] | Home Equity - 1st Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	190		190		65
Unpaid Principal Balance, with an allowance for loan losses recorded	219		219		64
Recorded Investment	190		190		65
Unpaid Principal Balance	219		219		64
Related Allowance	49		49		4
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	158	67	125	115
Interest Income Recognized, with an allowance for loan losses recorded	1	1	4	4
Average Recorded Investment	158	67	125	115
Interest Income Recognized	1	1	4	4
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	648		648		156
Unpaid Principal Balance, with an allowance for loan losses recorded	657		657		155
Recorded Investment	648		648		156
Unpaid Principal Balance	657		657		155
Related Allowance	200		200		9
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	601	157	479	167
Interest Income Recognized, with an allowance for loan losses recorded	8	2	14	5
Average Recorded Investment	601	157	479	167
Interest Income Recognized	8	2	14	5
Installment [Member] | Home Equity - 1st Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		1
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		122
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	1,219		1,219		1,440
Unpaid Principal Balance, with an allowance for loan losses recorded	1,395		1,395		1,524
Recorded Investment	1,219		1,219		1,441
Unpaid Principal Balance	1,395		1,395		1,646
Related Allowance	77		77		89
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	1	0	1
Interest Income Recognized, with no related allowance for loan losses recorded	0	1	0	5
Average Recorded Investment, with an allowance for loan losses recorded	1,242	1,545	1,328	1,595
Interest Income Recognized, with an allowance for loan losses recorded	27	27	70	81
Average Recorded Investment	1,242	1,546	1,328	1,596
Interest Income Recognized	27	28	70	86
Installment [Member] | Home Equity - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	15		15		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	1,406		1,406		1,471
Unpaid Principal Balance, with an allowance for loan losses recorded	1,417		1,417		1,491
Recorded Investment	1,406		1,406		1,471
Unpaid Principal Balance	1,432		1,432		1,491
Related Allowance	116		116		92
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	1,420	1,679	1,446	1,728
Interest Income Recognized, with an allowance for loan losses recorded	20	24	61	76
Average Recorded Investment	1,420	1,679	1,446	1,728
Interest Income Recognized	20	24	61	76
Installment [Member] | Boat Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	5		5		5
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	140		140		0
Unpaid Principal Balance, with an allowance for loan losses recorded	177		177		0
Recorded Investment	140		140		0
Unpaid Principal Balance	182		182		5
Related Allowance	37		37		0
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	86	1	68	1
Interest Income Recognized, with an allowance for loan losses recorded	2	0	2	0
Average Recorded Investment	86	1	68	1
Interest Income Recognized	2	0	2	0
Installment [Member] | Recreational Vehicle Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	0		0		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	49		49		79
Unpaid Principal Balance, with an allowance for loan losses recorded	50		50		79
Recorded Investment	49		49		79
Unpaid Principal Balance	50		50		79
Related Allowance	3		3		4
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	0	0	0	0
Average Recorded Investment, with an allowance for loan losses recorded	50	83	65	86
Interest Income Recognized, with an allowance for loan losses recorded	1	1	2	3
Average Recorded Investment	50	83	65	86
Interest Income Recognized	1	1	2	3
Installment [Member] | Other [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	0		0		0
Unpaid Principal Balance, with no related allowance for loan losses recorded	24		24		15
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	409		409		379
Unpaid Principal Balance, with an allowance for loan losses recorded	477		477		406
Recorded Investment	409		409		379
Unpaid Principal Balance	501		501		421
Related Allowance	64		64		$ 21
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with no related allowance for loan losses recorded	0	0	0	0
Interest Income Recognized, with no related allowance for loan losses recorded	1	0	1	1
Average Recorded Investment, with an allowance for loan losses recorded	443	406	437	406
Interest Income Recognized, with an allowance for loan losses recorded	3	5	14	18
Average Recorded Investment	443	406	437	406
Interest Income Recognized	$ 4	$ 5	$ 15	$ 19