Fair Value Disclosures, Part 4 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Asset (Liability) Fair Value [Abstract]
Capitalized mortgage loan servicing rights	$ 7,307	$ 7,773
Other real estate [Abstract]
Payment Plan Receivables	54,544	60,638
Payment Plan Receivable [Member]
Other real estate [Abstract]
Payment Plan Receivables	2,668	2,668
Impaired Loans Commercial [Member]
Impaired loan [Abstract]
Commercial	7,310	5,597
Impaired Loans Mortgage [Member]
Impaired loan [Abstract]
Mortgage	1,834	1,795
Other Real Estate Commercial [Member]
Other real estate [Abstract]
Commercial	1,819	1,606
Other Real Estate Mortgage and Installment [Member]
Other real estate [Abstract]
Mortgage and installment	1,299	1,623
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)	10.06%	10.09%
Cost to service	83	81
Ancillary income	$ 29	$ 29
Float rate (in hundredths)	1.80%	1.79%
Sales Comparison Approach [Member] | Payment Plan Receivable [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	10.40%	10.40%
Sales Comparison Approach [Member] | Impaired Loans Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	0.70%	(1.90%)
Sales Comparison Approach [Member] | Impaired Loans Mortgage [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	2.50%	3.20%
Sales Comparison Approach [Member] | Other Real Estate Commercial [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	(3.20%)	(5.70%)
Sales Comparison Approach [Member] | Other Real Estate Mortgage and Installment [Member]
Unobservable Inputs Weighted Average [Abstract]
Adjustment for differences between comparable sales (in hundredths)	64.10%	55.70%