Loans, Impaired Financing Receivables (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Impaired loan with no allocated allowance [Abstract]
TDR		$ 382		$ 349
Non - TDR		164		175
Impaired loans with an allocated allowance [Abstract]
TDR - allowance based on collateral		1,988		2,482
TDR - allowance based on present value cash flow		61,261		62,113
Non - TDR - allowance based on collateral		0		148
Total impaired loans		63,795		65,267
Amount of allowance for loan losses allocated [Abstract]
TDR - allowance based on collateral		533		684
TDR - allowance based on present value cash flow		5,799		6,089
Non - TDR - allowance based on collateral		0		66
Total amount of allowance for loan losses allocated		6,332		6,839
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	551		527
Unpaid Principal Balance, with no related allowance	[1]	1,128		1,087
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	63,518		65,017
Unpaid Principal Balance, with an allowance recorded	[1]	65,363		67,289
Recorded Investment	[1]	64,069		65,544
Unpaid Principal Balance	[1]	66,491		68,376
Related Allowance	[1]	6,332		6,839
Accrued interest included in recorded investment	[1]	274		277
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	540	$ 1,633
Interest Income Recognized, with No Related Allowance	[2]	12	5
Average Recorded Investment, with Related Allowance	[2]	64,271	75,020
Interest Income Recognized, with Related Allowance	[2]	791	848
Average Recorded Investment	[2]	64,811	76,653
Interest Income Recognized	[2]	803	853
Commercial [Member] | Income Producing - Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	5,178		5,195
Unpaid Principal Balance, with an allowance recorded	[1]	5,158		5,347
Recorded Investment	[1]	5,178		5,195
Unpaid Principal Balance	[1]	5,158		5,347
Related Allowance	[1]	344		347
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	444
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	5,187	7,739
Interest Income Recognized, with Related Allowance	[2]	68	105
Average Recorded Investment	[2]	5,187	8,183
Interest Income Recognized	[2]	68	105
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	156		166
Unpaid Principal Balance, with an allowance recorded	[1]	155		194
Recorded Investment	[1]	156		166
Unpaid Principal Balance	[1]	155		194
Related Allowance	[1]	5		9
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	16
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	161	203
Interest Income Recognized, with Related Allowance	[2]	2	2
Average Recorded Investment	[2]	161	219
Interest Income Recognized	[2]	2	2
Commercial [Member] | Commercial and Industrial [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	515		524
Unpaid Principal Balance, with no related allowance	[1]	541		549
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	2,499		2,535
Unpaid Principal Balance, with an allowance recorded	[1]	2,556		2,651
Recorded Investment	[1]	3,014		3,059
Unpaid Principal Balance	[1]	3,097		3,200
Related Allowance	[1]	390		481
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	520	1,171
Interest Income Recognized, with No Related Allowance	[2]	4	0
Average Recorded Investment, with Related Allowance	[2]	2,517	4,099
Interest Income Recognized, with Related Allowance	[2]	32	35
Average Recorded Investment	[2]	3,037	5,270
Interest Income Recognized	[2]	36	35
Mortgage [Member] | 1-4 Family [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	35		2
Unpaid Principal Balance, with no related allowance	[1]	476		469
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	35,885		36,848
Unpaid Principal Balance, with an allowance recorded	[1]	37,464		38,480
Recorded Investment	[1]	35,920		36,850
Unpaid Principal Balance	[1]	37,940		38,949
Related Allowance	[1]	3,248		3,454
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	19	2
Interest Income Recognized, with No Related Allowance	[2]	6	4
Average Recorded Investment, with Related Allowance	[2]	36,367	40,900
Interest Income Recognized, with Related Allowance	[2]	458	464
Average Recorded Investment	[2]	36,386	40,902
Interest Income Recognized	[2]	464	468
Mortgage [Member] | Resort Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	15,579		15,978
Unpaid Principal Balance, with an allowance recorded	[1]	15,607		16,046
Recorded Investment	[1]	15,579		15,978
Unpaid Principal Balance	[1]	15,607		16,046
Related Allowance	[1]	2,044		2,210
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	15,779	16,795
Interest Income Recognized, with Related Allowance	[2]	164	161
Average Recorded Investment	[2]	15,779	16,795
Interest Income Recognized	[2]	164	161
Mortgage [Member] | Home Equity - 1st Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	154		173
Unpaid Principal Balance, with an allowance recorded	[1]	160		236
Recorded Investment	[1]	154		173
Unpaid Principal Balance	[1]	160		236
Related Allowance	[1]	36		43
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	164	235
Interest Income Recognized, with Related Allowance	[2]	2	2
Average Recorded Investment	[2]	164	235
Interest Income Recognized	[2]	2	2
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	177		178
Unpaid Principal Balance, with an allowance recorded	[1]	212		213
Recorded Investment	[1]	177		178
Unpaid Principal Balance	[1]	212		213
Related Allowance	[1]	17		18
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	178	254
Interest Income Recognized, with Related Allowance	[2]	2	2
Average Recorded Investment	[2]	178	254
Interest Income Recognized	[2]	2	2
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	[1]	94		69
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	1,622		1,667
Unpaid Principal Balance, with an allowance recorded	[1]	1,738		1,804
Recorded Investment	[1]	1,623		1,668
Unpaid Principal Balance	[1]	1,832		1,873
Related Allowance	[1]	106		108
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	1	0
Interest Income Recognized, with No Related Allowance	[2]	2	1
Average Recorded Investment, with Related Allowance	[2]	1,645	1,939
Interest Income Recognized, with Related Allowance	[2]	29	34
Average Recorded Investment	[2]	1,646	1,939
Interest Income Recognized	[2]	31	35
Installment [Member] | Home Equity - 2nd Lien [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	1,761		1,793
Unpaid Principal Balance, with an allowance recorded	[1]	1,778		1,805
Recorded Investment	[1]	1,761		1,793
Unpaid Principal Balance	[1]	1,778		1,805
Related Allowance	[1]	114		140
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	1,777	2,362
Interest Income Recognized, with Related Allowance	[2]	27	35
Average Recorded Investment	[2]	1,777	2,362
Interest Income Recognized	[2]	27	35
Installment [Member] | Boat Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	1		1
Unpaid Principal Balance, with an allowance recorded	[1]	5		5
Recorded Investment	[1]	1		1
Unpaid Principal Balance	[1]	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	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	1	1
Interest Income Recognized, with Related Allowance	[2]	0	0
Average Recorded Investment	[2]	1	1
Interest Income Recognized	[2]	0	0
Installment [Member] | Recreational Vehicle Lending [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	0		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	87		90
Unpaid Principal Balance, with an allowance recorded	[1]	87		90
Recorded Investment	[1]	87		90
Unpaid Principal Balance	[1]	87		90
Related Allowance	[1]	5		5
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	89	108
Interest Income Recognized, with Related Allowance	[2]	1	1
Average Recorded Investment	[2]	89	108
Interest Income Recognized	[2]	1	1
Installment [Member] | Other [Member]
Impaired Loans by class [Abstract]
Recorded Investment, with no related allowance recorded	[1]	0		0
Unpaid Principal Balance, with no related allowance	[1]	17		0
With no related allowance recorded	[1]	0		0
Recorded Investment, with an allowance recorded	[1]	419		393
Unpaid Principal Balance, with an allowance recorded	[1]	443		418
Recorded Investment	[1]	419		393
Unpaid Principal Balance	[1]	460		418
Related Allowance	[1]	22		$ 23
Average recorded investment in and interest income earned on impaired loans by class [Abstract]
Average Recorded Investment, with No Related Allowance	[2]	0	0
Interest Income Recognized, with No Related Allowance	[2]	0	0
Average Recorded Investment, with Related Allowance	[2]	406	385
Interest Income Recognized, with Related Allowance	[2]	6	7
Average Recorded Investment	[2]	406	385
Interest Income Recognized	[2]	$ 6	$ 7

[1] There were no impaired purchased mortgage loans at March 31, 2018 or December 31, 2017.

[2] There were no impaired purchased mortgage loans during the three month periods ended March 31, 2018 and 2017, respectively.