Loans, Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2017 USD ($) Contract		Jun. 30, 2016 USD ($) Contract		Jun. 30, 2017 USD ($) Payments Contract		Jun. 30, 2016 USD ($) Contract		Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring		$ 71,327				$ 71,327				$ 77,922
Troubled debt restructuring, specific reserve		$ 7,200				$ 7,200				9,000
Number of Consecutive Timely Payments Required | Payments						6
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		13	[1]	7	[1]	22	[2]	20	[2]
Pre-modification recorded balance		$ 889	[1]	$ 221	[1]	$ 1,307	[2]	$ 2,480	[2]
Post-modification recorded balance		890	[1]	224	[1]	1,312	[2]	2,527	[2]
Increase (decrease) in allowance for loan losses		0		0		100		300
Charge offs due to troubled debt restructurings		0		0		$ 0		0
TDR that subsequently defaulted [Abstract]
Past due period for modified loans						90 days
Charge-offs on TDRs that subsequently defaulted		0		$ 0		$ 0		$ 0
Minimum [Member]
Financing Receivable, Modifications [Line Items]
Modification of stated interest rate of loans, range of period						9 months
Modifications involving extension of maturity date, period range						1 month
Maximum [Member]
Financing Receivable, Modifications [Line Items]
Modification of stated interest rate of loans, range of period						36 months
Modification of stated interest rate of loans, range of period in certain circumstances						480 months
Modifications involving extension of maturity date, period range						60 months
Modifications involving extension of maturity date, period range in certain circumstances						230 months
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring		66,651				$ 66,651				70,286
Non-performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	[3]	4,676				4,676				7,636
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring		11,043				11,043				14,125
Commercial [Member] | Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring		10,551				10,551				10,560
Commercial [Member] | Non-performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	[3]	$ 492				$ 492				3,565
Commercial [Member] | Income Producing - Real Estate [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	0	[2]	2	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 110	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 110	[2]
Commercial [Member] | Land, Land Development and Construction - Real Estate [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	0	[2]	0	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Commercial [Member] | Commercial and Industrial [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		9	[1]	0	[1]	12	[2]	4	[2]
Pre-modification recorded balance		$ 653	[1]	$ 0	[1]	$ 786	[2]	$ 1,758	[2]
Post-modification recorded balance		$ 653	[1]	$ 0	[1]	$ 786	[2]	$ 1,758	[2]
Mortgage [Member] | 1-4 Family [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		1	[1]	1	[1]	2	[2]	3	[2]
Pre-modification recorded balance		$ 32	[1]	$ 109	[1]	$ 49	[2]	$ 192	[2]
Post-modification recorded balance		$ 32	[1]	$ 110	[1]	$ 49	[2]	$ 263	[2]
Mortgage [Member] | Resort Lending [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	1	[2]	1	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 189	[2]	$ 116	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 189	[2]	$ 117	[2]
Mortgage [Member] | Home Equity - 1st Lien [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	0	[2]	1	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 107	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 78	[2]
Mortgage [Member] | Home Equity - 2nd Lien [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	0	[2]	0	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Installment [Member] | Home Equity - 1st Lien [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	3	[1]	2	[2]	4	[2]
Pre-modification recorded balance		$ 0	[1]	$ 29	[1]	$ 34	[2]	$ 59	[2]
Post-modification recorded balance		$ 0	[1]	$ 29	[1]	$ 37	[2]	$ 60	[2]
Installment [Member] | Home Equity - 2nd Lien [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		3	[1]	2	[1]	5	[2]	4	[2]
Pre-modification recorded balance		$ 204	[1]	$ 71	[1]	$ 249	[2]	$ 126	[2]
Post-modification recorded balance		$ 205	[1]	$ 73	[1]	$ 251	[2]	$ 129	[2]
Installment [Member] | Boat Lending [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	0	[2]	0	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Installment [Member] | Recreational Vehicle Lending [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	0	[1]	0	[2]	0	[2]
Pre-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Post-modification recorded balance		$ 0	[1]	$ 0	[1]	$ 0	[2]	$ 0	[2]
Installment [Member] | Other [Member]
Loans classified as troubled debt restructurings [Abstract]
Number of contracts | Contract		0	[1]	1	[1]	0	[2]	1	[2]
Pre-modification recorded balance		$ 0	[1]	$ 12	[1]	$ 0	[2]	$ 12	[2]
Post-modification recorded balance		0	[1]	$ 12	[1]	0	[2]	$ 12	[2]
Retail [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	[4]	60,284				60,284				63,797
Retail [Member] | Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	[4]	56,100				56,100				59,726
Retail [Member] | Non-performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	[3],[4],[5]	$ 4,184				$ 4,184				$ 4,071

[1] There were no purchased mortgage loans classified as troubled debt restructurings during the three month periods ended June 30, 2017 and 2016, respectively.

[2] There were no purchased mortgage loans classified as troubled debt restructurings during the six month periods ended June 30, 2017 and 2016, respectively.

[3] Included in non-performing loans table above.

[4] Retail loans include mortgage and installment loan segments.

[5] Also includes loans on non-accrual at the time of modification until six payments are received on a timely basis.