Loans, Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Impaired loans with no allocated allowance for loan losses [Abstract]
Troubled debt restructurings ("TDR")	$ 266		$ 266		$ 0
Non - TDR	500		500		0
Impaired loans with an allocated allowance for loan losses [Abstract]
TDR - allowance based on collateral	1,611		1,611		2,787
TDR - allowance based on present value cash flow	50,262		50,262		53,258
Non - TDR - allowance based on collateral	2,536		2,536		2,145
Total impaired loans	55,175		55,175		58,190
Amount of allowance for loan losses allocated [Abstract]
TDR - allowance based on collateral	272		272		769
TDR - allowance based on present value cash flow	4,874		4,874		4,849
Non - TDR - allowance based on collateral	881		881		692
Total amount of allowance for loan losses allocated	6,027		6,027		6,310
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	613		613		4
Unpaid Principal Balance, with no related allowance for loan losses recorded	836		836		616
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	54,822		54,822		58,457
Unpaid Principal Balance, with an allowance for loan losses recorded	57,892		57,892		60,282
Recorded Investment	55,435		55,435		58,461
Unpaid Principal Balance	58,728		58,728		60,898
Related Allowance	6,027		6,027		6,310
Accrued interest included in recorded investment	260		260		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	484	$ 1,849	324	$ 1,408
Interest Income Recognized, with no related allowance for loan losses recorded	2	15	2	27
Average Recorded Investment, with an allowance for loan losses recorded	56,119	62,383	56,898	63,260
Interest Income Recognized, with an allowance for loan losses recorded	708	747	1,473	1,538
Average Recorded Investment	56,603	64,232	57,222	64,668
Interest Income Recognized	710	762	1,475	1,565
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	5,874		5,874		4,770
Unpaid Principal Balance, with an allowance for loan losses recorded	5,863		5,863		4,758
Recorded Investment	5,874		5,874		4,770
Unpaid Principal Balance	5,863		5,863		4,758
Related Allowance	518		518		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	5,297	5,142	5,121	5,160
Interest Income Recognized, with an allowance for loan losses recorded	81	70	146	138
Average Recorded Investment	5,297	5,142	5,121	5,160
Interest Income Recognized	81	70	146	138
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	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	290		290		290
Unpaid Principal Balance, with an allowance for loan losses recorded	288		288		289
Recorded Investment	290		290		290
Unpaid Principal Balance	288		288		289
Related Allowance	31		31		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	0	1,201	0	801
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	290	155	290	159
Interest Income Recognized, with an allowance for loan losses recorded	2	2	4	4
Average Recorded Investment	290	1,356	290	960
Interest Income Recognized	2	2	4	4
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	1,918		1,918		3,637
Unpaid Principal Balance, with an allowance for loan losses recorded	2,184		2,184		3,735
Recorded Investment	1,918		1,918		3,637
Unpaid Principal Balance	2,184		2,184		3,735
Related Allowance	498		498		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	509	0	514
Interest Income Recognized, with no related allowance for loan losses recorded	0	9	0	13
Average Recorded Investment, with an allowance for loan losses recorded	2,418	2,522	2,824	2,526
Interest Income Recognized, with an allowance for loan losses recorded	16	34	36	66
Average Recorded Investment	2,418	3,031	2,824	3,040
Interest Income Recognized	16	43	36	79
Mortgage [Member] | 1-4 Family [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance for loan losses recorded	613		613		3
Unpaid Principal Balance, with no related allowance for loan losses recorded	800		800		474
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	30,411		30,411		32,842
Unpaid Principal Balance, with an allowance for loan losses recorded	32,568		32,568		34,427
Recorded Investment	31,024		31,024		32,845
Unpaid Principal Balance	33,368		33,368		34,901
Related Allowance	3,171		3,171		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	484	138	324	92
Interest Income Recognized, with no related allowance for loan losses recorded	2	3	2	9
Average Recorded Investment, with an allowance for loan losses recorded	31,364	35,345	31,857	35,846
Interest Income Recognized, with an allowance for loan losses recorded	414	431	860	889
Average Recorded Investment	31,848	35,483	32,181	35,938
Interest Income Recognized	416	434	862	898
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	12,392		12,392		13,328
Unpaid Principal Balance, with an allowance for loan losses recorded	12,704		12,704		13,354
Recorded Investment	12,392		12,392		13,328
Unpaid Principal Balance	12,704		12,704		13,354
Related Allowance	1,397		1,397		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	12,680	15,098	12,896	15,391
Interest Income Recognized, with an allowance for loan losses recorded	147	150	322	314
Average Recorded Investment	12,680	15,098	12,896	15,391
Interest Income Recognized	147	150	322	314
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	125		125		65
Unpaid Principal Balance, with an allowance for loan losses recorded	187		187		64
Recorded Investment	125		125		65
Unpaid Principal Balance	187		187		64
Related Allowance	26		26		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	122	111	103	131
Interest Income Recognized, with an allowance for loan losses recorded	2	1	3	3
Average Recorded Investment	122	111	103	131
Interest Income Recognized	2	1	3	3
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	554		554		156
Unpaid Principal Balance, with an allowance for loan losses recorded	564		564		155
Recorded Investment	554		554		156
Unpaid Principal Balance	564		564		155
Related Allowance	121		121		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	556	167	423	171
Interest Income Recognized, with an allowance for loan losses recorded	3	1	6	3
Average Recorded Investment	556	167	423	171
Interest Income Recognized	3	1	6	3
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	1,264		1,264		1,440
Unpaid Principal Balance, with an allowance for loan losses recorded	1,440		1,440		1,524
Recorded Investment	1,264		1,264		1,441
Unpaid Principal Balance	1,440		1,440		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	2	0	4
Average Recorded Investment, with an allowance for loan losses recorded	1,326	1,596	1,364	1,619
Interest Income Recognized, with an allowance for loan losses recorded	19	25	43	54
Average Recorded Investment	1,326	1,597	1,364	1,620
Interest Income Recognized	19	27	43	58
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	16		16		0
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	1,434		1,434		1,471
Unpaid Principal Balance, with an allowance for loan losses recorded	1,442		1,442		1,491
Recorded Investment	1,434		1,434		1,471
Unpaid Principal Balance	1,458		1,458		1,491
Related Allowance	100		100		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	1,453	1,746	1,459	1,762
Interest Income Recognized, with an allowance for loan losses recorded	19	25	41	52
Average Recorded Investment	1,453	1,746	1,459	1,762
Interest Income Recognized	19	25	41	52
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	32		32		0
Unpaid Principal Balance, with an allowance for loan losses recorded	48		48		0
Recorded Investment	32		32		0
Unpaid Principal Balance	53		53		5
Related Allowance	11		11		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	67	1	44	1
Interest Income Recognized, with an allowance for loan losses recorded	0	0	0	0
Average Recorded Investment	67	1	44	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 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	51		51		79
Unpaid Principal Balance, with an allowance for loan losses recorded	51		51		79
Recorded Investment	51		51		79
Unpaid Principal Balance	51		51		79
Related Allowance	4		4		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	67	86	71	87
Interest Income Recognized, with an allowance for loan losses recorded	0	1	1	2
Average Recorded Investment	67	86	71	87
Interest Income Recognized	0	1	1	2
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	15		15		15
With no related allowance for loan losses recorded	0		0		0
Recorded Investment, with an allowance for loan losses recorded	477		477		379
Unpaid Principal Balance, with an allowance for loan losses recorded	553		553		406
Recorded Investment	477		477		379
Unpaid Principal Balance	568		568		421
Related Allowance	73		73		$ 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	0	1	0	1
Average Recorded Investment, with an allowance for loan losses recorded	479	414	446	407
Interest Income Recognized, with an allowance for loan losses recorded	5	7	11	13
Average Recorded Investment	479	414	446	407
Interest Income Recognized	$ 5	$ 8	$ 11	$ 14