Fair Value Measurements, Quantitative Information (Details)	12 Months Ended
	Dec. 31, 2012
Mortgage Servicing Rights [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment speed assumption (in hundredths)	3.29%
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)	5.50%
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)	3.57%
Discount rate (in hundredths)	10.00%
Non-agency mortgage-backed securities [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (in hundredths)	7.00%
Non-agency mortgage-backed securities [Member] | Maximum [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate (in hundredths)	9.00%
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%