Fair Value Accounting (Fair Value Inputs, Assets, Quantitative Information) (Details) - Level 3 [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Internal Valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Potential additional payments based on earnings, period	3 years	3 years
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Internal Valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Potential additional payments based on earnings, period	5 years	5 years
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Internal Valuation [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated future monthly fees payable to the derivative counterparty, period	1 year	1 year
Fair Value, Measurements, Recurring [Member] | Visa Derivative [Member] | Internal Valuation [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated future monthly fees payable to the derivative counterparty, period	5 years	5 years
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Credit spread embedded in discount rate	4.29%	4.42%
Fair Value, Measurements, Recurring [Member] | Private Equity Investments [Member] | Internal Valuation [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for lack of liquidity		15.00%
Fair Value, Measurements, Recurring [Member] | SBA/GGL Loans Servicing Asset [Member] | Discounted Cash Flow [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	12.20%
Prepayment speeds	7.08%
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%	0.00%
Estimated selling costs	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	100.00%	52.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Collateral Dependent Impaired Loans [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	30.00%	25.00%
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Loans Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%
Estimated selling costs	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Loans Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	21.00%
Estimated selling costs	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Loans Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	21.00%
Estimated selling costs	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%	0.00%
Estimated selling costs	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	15.00%	10.00%
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	12.00%	5.00%
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Collateral Less Estimated Selling Costs or BOV [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Estimated selling costs	7.00%	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Real Estate Less Estimated Selling Costs or BOV [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Real Estate Less Estimated Selling Costs or BOV [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	16.00%	81.00%
Fair Value, Measurements, Nonrecurring [Member] | Other Assets Held for Sale [Member] | Third Party Appraised value of Real Estate Less Estimated Selling Costs or BOV [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount to appraised value	13.00%	47.00%