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Fair Value Of Assets And Liabilities (Schedule Of Unobservable Inputs Utilized In Determining The Fair Value Of Level 3 Recurring And Non-Recurring Measurements) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Securities available-for-sale   $ 5,170,255  
Loans held-for-sale (elected fair value) $ 18,940 20,881  
Loans, net of unearned income 27,701,740 [1] 27,658,929 [1] $ 19,989,319
OREO [2] 29,712 43,382  
Residential Real Estate      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
OREO 6,100 6,300  
Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Securities available-for-sale 4,724,411 4,931,402  
Loans held-for-sale (elected fair value) 18,940 20,881  
Derivative liabilities, other 135,349 85,061  
Other assets 189,259 121,456  
Non Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans, net of unearned income 29,061 26,666  
OREO 26,457 39,566  
Other assets 24,699 26,521  
Non Recurring | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale (elected fair value) 607 618  
Derivative liabilities, other | Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Derivative liabilities, other 9,432 5,684  
Other assets 163    
Level 3 | Residential Real Estate      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale (elected fair value) 17,325 19,544  
Level 3 | Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Securities available-for-sale 5,787 1,270  
Loans held-for-sale (elected fair value) 16,718 18,926  
Derivative liabilities, other 9,425 5,645  
Other assets 0 0  
Level 3 | Non Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans, net of unearned income 29,061 26,666  
OREO 26,457 39,566  
Other assets 24,699 26,521  
Level 3 | Non Recurring | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale (elected fair value) 607 618  
Level 3 | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Derivative liabilities, other 9,425 5,645  
Level 3 | Derivative liabilities, other | Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Derivative liabilities, other 9,425 5,645  
Other assets 0    
Level 3 | Loans held-for-sale- unguaranteed interest in SBA loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loans held-for-sale (elected fair value) 1,025 1,473  
Level 3 | Other assets | Non Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Other assets 24,699 26,521  
Level 3 | Discounted cash flow | Minimum | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Visa covered litigation resolution amount $ 5,000,000 $ 4,400,000  
Level 3 | Discounted cash flow | Minimum | Values Utilized | Loans held-for-sale- unguaranteed interest in SBA loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Bond equivalent yield 13.00% 9.00%  
Level 3 | Discounted cash flow | Minimum | 2% - 11% Values Utilized | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 2.00%    
Level 3 | Discounted cash flow | Minimum | 5% - 12% Values Utilized | Loans held- for-sale | Residential Real Estate | HELOC      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 5.00% 5.00%  
Level 3 | Discounted cash flow | Minimum | 50% - 70% Percent Values Utilized | Loans held- for-sale | Residential Real Estate      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Foreclosure losses 50.00% 50.00%  
Level 3 | Discounted cash flow | Minimum | 5% - 25% Of Unpaid Principle Balance | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loss severity trends - First mortgage 5.00%    
Level 3 | Discounted cash flow | Minimum | Percent Of Unpaid Principle Balance | Loans held- for-sale | Residential Real Estate | HELOC      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loss severity trends - First mortgage 50.00% 15.00%  
Level 3 | Discounted cash flow | Minimum | 8% - 12% Values Utilized | Loans held-for-sale- unguaranteed interest in SBA loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 8.00% 8.00%  
Level 3 | Discounted cash flow | Minimum | 20% - 30% Values Utilized | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of resolution scenarios 20.00%    
Level 3 | Discounted cash flow | Minimum | 10% - 30% Values Utilized | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of resolution scenarios   10.00%  
Level 3 | Discounted cash flow | Minimum | 24 - 48 Months | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Time until resolution 24 months    
Level 3 | Discounted cash flow | Minimum | 18 to 48 months | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Time until resolution   18 months  
Level 3 | Discounted cash flow | Minimum | 0% - 15% Adjustment To Yield | Other assets      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Adjustments to current sales yields for specific properties 0.00% 0.00%  
Level 3 | Discounted cash flow | Minimum | 2% - 12% Values Utilized | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate   2.00%  
Level 3 | Discounted cash flow | Minimum | 5% - 30% Percent Values Utilized | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loss severity trends - First mortgage   5.00%  
Level 3 | Discounted cash flow | Maximum | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Visa covered litigation resolution amount $ 5,600,000 $ 5,200,000  
Level 3 | Discounted cash flow | Maximum | Values Utilized | Loans held-for-sale- unguaranteed interest in SBA loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Bond equivalent yield 14.00% 10.00%  
Level 3 | Discounted cash flow | Maximum | 2% - 11% Values Utilized | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 11.00%    
Level 3 | Discounted cash flow | Maximum | 5% - 12% Values Utilized | Loans held- for-sale | Residential Real Estate | HELOC      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 12.00% 12.00%  
Level 3 | Discounted cash flow | Maximum | 50% - 70% Percent Values Utilized | Loans held- for-sale | Residential Real Estate      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Foreclosure losses 70.00% 70.00%  
Level 3 | Discounted cash flow | Maximum | 5% - 25% Of Unpaid Principle Balance | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loss severity trends - First mortgage 25.00%    
Level 3 | Discounted cash flow | Maximum | Percent Of Unpaid Principle Balance | Loans held- for-sale | Residential Real Estate | HELOC      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loss severity trends - First mortgage 100.00% 100.00%  
Level 3 | Discounted cash flow | Maximum | 8% - 12% Values Utilized | Loans held-for-sale- unguaranteed interest in SBA loans      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 12.00% 12.00%  
Level 3 | Discounted cash flow | Maximum | 20% - 30% Values Utilized | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of resolution scenarios 30.00%    
Level 3 | Discounted cash flow | Maximum | 10% - 30% Values Utilized | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Probability of resolution scenarios   30.00%  
Level 3 | Discounted cash flow | Maximum | 24 - 48 Months | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Time until resolution 48 months    
Level 3 | Discounted cash flow | Maximum | 18 to 48 months | Derivative liabilities, other | Derivative liabilities, other      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Time until resolution   48 months  
Level 3 | Discounted cash flow | Maximum | 0% - 15% Adjustment To Yield | Other assets      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Adjustments to current sales yields for specific properties 15.00% 15.00%  
Level 3 | Discounted cash flow | Maximum | 2% - 12% Values Utilized | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate   12.00%  
Level 3 | Discounted cash flow | Maximum | 5% - 30% Percent Values Utilized | Loans held- for-sale | Residential Real Estate | Loans held-for-sale—first mortgages      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Loss severity trends - First mortgage   30.00%  
Level 3 | Appraisals from comparable properties | Minimum | 0% -10% Of Appraisal | Loans, net of unearned income      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Marketability adjustments for specific properties 0.00% 0.00%  
Level 3 | Appraisals from comparable properties | Minimum | 0% -10% Of Appraisal | OREO      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Adjustment for value changes since appraisal 0.00% 0.00%  
Level 3 | Appraisals from comparable properties | Minimum | 0% - 25% Of Appraisal | Other assets      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Marketability adjustments for specific properties 0.00% 0.00%  
Level 3 | Appraisals from comparable properties | Maximum | 0% -10% Of Appraisal | Loans, net of unearned income      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Marketability adjustments for specific properties 10.00% 10.00%  
Level 3 | Appraisals from comparable properties | Maximum | 0% -10% Of Appraisal | OREO      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Adjustment for value changes since appraisal 10.00% 10.00%  
Level 3 | Appraisals from comparable properties | Maximum | 0% - 25% Of Appraisal | Other assets      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Marketability adjustments for specific properties 25.00% 25.00%  
Level 3 | Other collateral valuations | Minimum | 20% - 50% Of Gross Value | Loans, net of unearned income      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Borrowing base certificates adjustment 20.00% 20.00%  
Level 3 | Other collateral valuations | Minimum | 0% - 25% Of Reported Value | Loans, net of unearned income      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Financial Statements/Auction values adjustment 0.00% 0.00%  
Level 3 | Other collateral valuations | Maximum | 20% - 50% Of Gross Value | Loans, net of unearned income      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Borrowing base certificates adjustment 50.00% 50.00%  
Level 3 | Other collateral valuations | Maximum | 0% - 25% Of Reported Value | Loans, net of unearned income      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Financial Statements/Auction values adjustment 25.00% 25.00%  
Level 3 | Interest- only strips- AFS | Recurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Securities available-for-sale $ 5,787 $ 1,270  
Level 3 | Interest- only strips- AFS | Discounted cash flow | Values Utilized | Available-for-sale securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate 11.00%    
Level 3 | Interest- only strips- AFS | Discounted cash flow | 17% Values Utilized | Available-for-sale securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Bond equivalent yield   17.00%  
Level 3 | Interest- only strips- AFS | Discounted cash flow | Minimum | 12% - 14% Values Utilized | Available-for-sale securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Bond equivalent yield 12.00%    
Level 3 | Interest- only strips- AFS | Discounted cash flow | Minimum | 10% - 11% Values Utilized | Available-for-sale securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate   10.00%  
Level 3 | Interest- only strips- AFS | Discounted cash flow | Maximum | 12% - 14% Values Utilized | Available-for-sale securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Bond equivalent yield 14.00%    
Level 3 | Interest- only strips- AFS | Discounted cash flow | Maximum | 10% - 11% Values Utilized | Available-for-sale securities      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Constant prepayment rate   11.00%  
[1] June 30, 2018 and December 31, 2017 include $21.4 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] June 30, 2018 and December 31, 2017 include $6.1 million and $6.3 million, respectively, of foreclosed residential real estate.