Fair Value Measurements, Quantitative Information (Details)	3 Months Ended
	Mar. 31, 2013
Mortgage Servicing Rights [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment speed assumption (in hundredths)	284.00%
Discount rate (in hundredths)	8.00%
Mortgage Servicing Rights [Member] | Maximum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment speed assumption (in hundredths)	550.00%
Discount rate (in hundredths)	12.00%
Mortgage Servicing Rights [Member] | Weighted Average [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment speed assumption (in hundredths)	310.00%
Discount rate (in hundredths)	10.00%
Non-agency mortgage-backed securities [Member] | Weighted Average [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (in hundredths)	8.00%
OREO [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjusted for difference between comparable sales	0.00%
OREO [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjusted for difference between comparable sales	44.00%
OREO [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjusted for difference between comparable sales	12.00%
Impaired Loans [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjusted for difference between comparable sales	0.00%
Impaired Loans [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjusted for difference between comparable sales	100.00%
Impaired Loans [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Adjusted for difference between comparable sales	7.00%