Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Equity Securities [Member] | Historical Cost [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	891,000
Corporate Bonds [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	5.00%
Discount for Lack of Marketability	0.00%	[1]
Corporate Bonds [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	7.00%
Discount for Lack of Marketability	10.00%	[1]
Corporate Bonds [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	5.98%
Discount for Lack of Marketability	0.00%	[1]
Corporate Bonds [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	1,002,000
Trust Preferred Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	2.50%
Discount for Lack of Marketability	0.00%	[1]
Trust Preferred Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	7.50%
Discount for Lack of Marketability	10.00%	[1]
Trust Preferred Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	5.68%
Discount for Lack of Marketability	0.00%	[1]
Trust Preferred Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	3,210,000
Private Equity Investments [Member] | Individual Analysis of Each Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	29,847,000
Visa Derivative [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability-weighted potential outcomes of the Covered Litigation and related fees payable	400,000
Visa Derivative [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability-weighted potential outcomes of the Covered Litigation and related fees payable	3,100,000
Visa Derivative [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Probability-weighted potential outcomes of the Covered Litigation and related fees payable	3,100,000
Visa Derivative [Member] | Internal Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	3,050,000
Collateral Dependent Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	0.00%
Estimated selling costs	0.00%
Collateral Dependent Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	75.00%
Estimated selling costs	10.00%
Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	20.00%
Estimated selling costs	7.00%
Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	516,038,000
Other Loans Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	0.00%
Estimated selling costs	0.00%
Other Loans Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	75.00%
Estimated selling costs	10.00%
Other Loans Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	20.00%
Estimated selling costs	7.00%
Other Loans Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	4,074,000
Other Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	0.00%
Estimated selling costs	0.00%
Other Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	50.00%
Estimated selling costs	10.00%
Other Real Estate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	22.00%
Estimated selling costs	7.00%
Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	154,475,000
Other Assets Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	0.00%
Estimated selling costs	0.00%
Other Assets Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	45.00%
Estimated selling costs	10.00%
Other Assets Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	20.00%
Estimated selling costs	7.00%
Other Assets Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	3,199,000

[1] Represents amount used when the reporting entity has determined that market participants would take into account this discount when pricing the investment.