Fair Value of Financial Instruments (Quantative information regarding valuation techniques and inputs) (Details) (Significant unobservable inputs (Level 3))	12 Months Ended
	Dec. 31, 2012
Recurring | Residential MBS | Minimum | Discounted cash flow and consensus pricing
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Prepayment	7.00%	[1]
Default	0.00%	[2]
Loss	0.00%
Recurring | Residential MBS | Maximum | Discounted cash flow and consensus pricing
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Prepayment	39.80%	[1]
Default	15.88%	[2]
Loss	131.78%
Recurring | Interest rate contract | Minimum | Discounted cash flow and market indicators
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Swap rates	0.50%
Libor	0.20%
Recurring | Interest rate contract | Maximum | Discounted cash flow and market indicators
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Swap rates	1.00%
Libor	0.85%
Recurring | Unexercised warrants | Minimum | Black Scholes
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Volatility	90.00%
Duration	2 years
RF rate	0.30%
Recurring | Unexercised warrants | Maximum | Black Scholes
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Volatility	100.00%
Duration	2 years 6 months
RF rate	1.00%
Recurring | Interest rate swap | Minimum | Discounted cash flow and market indicators
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Swap rates	0.50%
Libor	0.25%
Recurring | Interest rate swap | Maximum | Discounted cash flow and market indicators
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Swap rates	1.00%
Libor	0.75%
Nonrecurring | OREO | Minimum | Appraisal of collateral
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Appraisal	10.00%
Liquidation	10.00%
Nonrecurring | OREO | Maximum | Appraisal of collateral
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Appraisal	35.00%
Liquidation	15.00%
Nonrecurring | Loans | Minimum | Discounted cash flows and appraisal of collateral
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Discount Rate	4.00%
Appraisal	10.00%
Liquidation	10.00%
Nonrecurring | Loans | Maximum | Discounted cash flows and appraisal of collateral
Fair Value Inputs, Assets And Liabilities, Quantitative Information [Line Items]
Discount Rate	9.00%
Appraisal	35.00%
Liquidation	15.00%

[1] CPR = Constant prepayment rate

[2] CDR = Constant default rate