Fair Value Measurement for Financial and Non-Financial Assets and Liabilities (Details 4) (Level 3, USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Servicing assets
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Fair value of assets	$ 17,536	$ 16,108
Servicing assets | Minimum | Discounted cash flow
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Discount rate (as a percent)	4.50%	4.50%
Constant prepayment rate (as a percent)	9.00%	10.10%
Servicing assets | Maximum | Discounted cash flow
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Discount rate (as a percent)	7.80%	7.80%
Constant prepayment rate (as a percent)	9.60%	10.90%
Commercial Real Estate
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Fair value of assets	5,191	9,330
Commercial Real Estate | Sales comparison approach
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Adjustment for difference between comparable sales and expected sales amounts (as a percent)	64.06%
Commercial Real Estate | Weighted Average | Sales comparison approach
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Adjustment for difference between comparable sales and expected sales amounts (as a percent)		54.64%
Residential Real Estate
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Fair value of assets	449	649
Residential Real Estate | Weighted Average | Sales comparison approach
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Adjustment for difference between comparable sales and expected sales amounts (as a percent)	19.24%	50.08%
OREO: Commercial Real Estate
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Fair value of assets	8,434	4,866
OREO: Commercial Real Estate | Weighted Average | Sales comparison approach
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Adjustment for difference between comparable sales and expected sales amounts (as a percent)	29.01%	15.08%
OREO: Residential Real Estate
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Fair value of assets	535
OREO: Residential Real Estate | Weighted Average | Sales comparison approach
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Adjustment for difference between comparable sales and expected sales amounts (as a percent)	10.23%
Impaired Loans Held-For-Sale: Commercial Real Estate
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Fair value of assets		$ 800
Impaired Loans Held-For-Sale: Commercial Real Estate | Weighted Average | Sales comparison approach
Quantitative information about the significant unobservable inputs (level 3) used in the fair value measurement for asset and liabilities measured on a recurring and non-recurring basis
Adjustment for difference between comparable sales and expected sales amounts (as a percent)		63.91%