Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Equity Securities [Member] | Individual Analysis of Each Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 892		$ 891
Trust Preferred Securities [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	0.00%	[1]	0.00%	[1]
Credit spread embedded in discount rate	4.25%	[1]	4.25%	[1]
Trust Preferred Securities [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	10.00%	[1]	10.00%	[1]
Credit spread embedded in discount rate	5.25%	[1]	6.50%	[1]
Trust Preferred Securities [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount for Lack of Marketability	0.00%	[1]	0.00%	[1]
Credit spread embedded in discount rate	4.63%	[1]	5.71%	[1]
Trust Preferred Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	2,562		2,287
Private Equity Investments [Member] | Individual Analysis of Each Investee Company [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	29,568		30,708
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	[1]	400	[1]
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	3,000	[1]	3,000	[1]
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	3,000	[1]	3,000	[1]
Visa Derivative [Member] | Probability Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	2,977		2,956
Collateral Dependent Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	0.00%	[1]	0.00%	[1]
Discount to appraised value	0.00%	[1]	0.00%	[1]
Collateral Dependent Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	10.00%	[1]	10.00%	[1]
Discount to appraised value	53.00%	[1]	12.00%	[1]
Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	7.00%	[1]	7.00%	[1]
Discount to appraised value	22.00%	[1]	4.00%	[1]
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	233,530		80,299
Other Loans Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	0.00%	[1]
Estimated selling costs	0.00%	[1]	0.00%	[1]
Discount to appraised value			0.00%	[1]
Other Loans Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	1.00%	[1]
Estimated selling costs	10.00%	[1]	10.00%	[1]
Discount to appraised value			0.12%	[1]
Other Loans Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraised value	1.00%	[1]
Estimated selling costs	7.00%	[1]	7.00%	[1]
Discount to appraised value			0.04%	[1]
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	7,594		7,420
Other Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	0.00%	[1]	0.00%	[1]
Discount to appraised value	0.00%	[1]	0.00%	[1]
Other Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	10.00%	[1]	10.00%	[1]
Discount to appraised value	8.00%	[1]	7.00%	[1]
Other Real Estate [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	7.00%	[1]	7.00%	[1]
Discount to appraised value	8.00%	[1]	2.00%	[1]
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	20,583		79,293
Other Assets Held for Sale [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	0.00%	[1]	0.00%	[1]
Discount to appraised value	0.00%	[1]	13.00%	[1]
Other Assets Held for Sale [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	10.00%	[1]	10.00%	[1]
Discount to appraised value	29.00%	[1]	51.00%	[1]
Other Assets Held for Sale [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	7.00%	[1]	7.00%	[1]
Discount to appraised value	3.00%	[1]	29.00%	[1]
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	$ 409		$ 5,804

[1] The range represents management's best estimate of the high and low of the value that would be assigned to a particular input. The weighted average is the measure of central tendencies; it is the value that management is using or most likely to use for the asset or liability.