Fair Value of Assets and Liabilities (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Mortgage Servicing Rights | Discounted cash flow valuation technique
Summary of the significant unobservable inputs
Fair Value at the end of the period	$ 25,357
Weighted Average Constant Prepayment Rate (as a percent)	13.74%
Weighted Average Discount Rate (as a percent)	5.54%
Interest Rate Lock Commitments | Pricing Model
Summary of the significant unobservable inputs
Fair Value at the end of the period	13,037
Weighted Average Closing Ratio (as a percent)	87.37%
Interest Rate Swap Agreements | Discounted cash flow valuation technique
Summary of the significant unobservable inputs
Fair Value at the end of the period	$ (269)
Weighted Average Credit Factor (as a percent)	0.76%