Fair Value Disclosures, Part 3 (Details) - USD ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Asset (Liability) Fair Value [Abstract]
Capitalized mortgage loan servicing rights		$ 10,454,000	$ 8,481,000
Impaired Loans Commercial [Member]
Impaired loan [Abstract]
Commercial	[1]	1,601,000	1,605,000
Unobservable Inputs Weighted Average [Abstract]
Total impaired collateral value		$ 200,000	$ 400,000
Impaired Loans Commercial [Member] | Minimum [Member]
Unobservable Inputs Weighted Average [Abstract]
Discount rate		0.00%	0.00%
Impaired Loans Commercial [Member] | Maximum [Member]
Unobservable Inputs Weighted Average [Abstract]
Discount rate		100.00%	100.00%
Mortgage [Member]
Impaired loan [Abstract]
Mortgage		$ 785,000	$ 550,000
Other Real Estate Commercial [Member]
Other real estate [Abstract]
Commercial		549,000	804,000
Mortgage and Installment [Member]
Other real estate [Abstract]
Mortgage and installment		$ 200,000	$ 183,000
Income Approach [Member] | Impaired Loans Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Capitalization rate			9.30%
Present Value of Net Servicing Revenue [Member]
Unobservable Inputs Weighted Average [Abstract]
Discount rate		10.04%	10.04%
Cost to service		$ 80	$ 80
Ancillary income		$ 24	$ 24
Float rate		1.17%	1.73%
Sales Comparison Approach [Member] | Impaired Loans Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales		(1.20%)	(2.10%)
Sales Comparison Approach [Member] | Mortgage [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales		2.20%	0.70%
Sales Comparison Approach [Member] | Other Real Estate Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales		(5.60%)	(3.90%)
Sales Comparison Approach [Member] | Mortgage and Installment [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales		58.50%	75.60%

[1] In addition to the valuation techniques and unobservable inputs discussed above, at March 31, 2016 and December 31, 2015, we had an impaired collateral dependent commercial relationship that totaled $0.2 million and $0.4 million, respectively that was primarily secured by collateral other than real estate. Collateral securing this relationship primarily included machinery and equipment and inventory at March 31, 2016 and December 31, 2015. Valuation techniques at March 31, 2016 and December 31, 2015, included appraisals and discounting restructuring firm valuations based on estimates of value recovery of each particular asset type. Discount rates used ranged from 0% to 100% of stated values.