Fair Value Disclosures, Part 4 (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Asset (Liability) Fair Value [Abstract]
Capitalized mortgage loan servicing rights	8,129,000		9,197,000
Impaired Loans Commercial [Member]
Impaired loan [Abstract]
Commercial	2,406,000	[1]	2,751,000	[1]
Impaired Loans Mortgage [Member]
Impaired loan [Abstract]
Mortgage	1,356,000		1,306,000
Other Real Estate Commercial [Member]
Other real estate [Abstract]
Commercial	677,000		1,216,000
Other Real Estate Mortgage and Installment [Member]
Other real estate [Abstract]
Mortgage and installment	529,000		690,000
Income Approach [Member] | Impaired Loans Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Capitalization rate (in hundredths)	9.30%		9.30%
Present Value of Net Servicing Revenue [Member]
Unobservable Inputs Weighted Average [Abstract]
Discount rate (in hundredths)	10.02%		10.07%
Cost to service	80		82
Ancillary income	25		25
Float rate (in hundredths)	1.53%		1.77%
Sales Comparison Approach [Member] | Impaired Loans Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	(3.70%)		(3.80%)
Sales Comparison Approach [Member] | Impaired Loans Mortgage [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	9.10%		8.60%
Sales Comparison Approach [Member] | Other Real Estate Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	(5.30%)		(9.00%)
Sales Comparison Approach [Member] | Other Real Estate Mortgage and Installment [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	16.00%		34.30%

[1] In addition to the valuation techniques and unobservable inputs discussed above, at March 31, 2015 and December 31, 2014 we had an impaired collateral dependent commercial relationship that totaled $1.0 million and $1.1 million, respectively that was primarily secured by collateral other than real estate. Collateral securing this relationship primarily included machinery and equipment, accounts receivable, inventory and company stock. Valuation techniques at March 31, 2015 included discounting restructuring firm valuations based on estimates of value recovery of each particular asset type. Discount rates used ranged from 20% to 100% of stated values while valuation techniques at December 31, 2014 included discounting cost and financial statement value approaches based on estimates of value recovery of each particular asset type. Discount rates used ranged from 35% to 100% of stated values.