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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
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Securities available-for-sale $ 4,826,155 $ 5,170,255 $ 5,170,255  
Loans held-for-sale 21,209 20,881 20,881  
Loans, net of unearned income 27,249,793 [1] 27,658,929 [1] 27,658,929 [1] $ 19,090,074
OREO [2] 35,715 43,382 43,382  
Residential Real Estate        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
OREO 6,400 6,300 6,300  
Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Securities available-for-sale 4,826,155 4,931,402 4,931,402  
Loans held-for-sale 21,209 20,881 20,881  
Other Liabilities, Fair Value Disclosure 121,394 85,061 85,061  
Other assets 181,781 121,456 121,456  
Non Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans, net of unearned income 28,873 26,666 26,666  
OREO 32,375 39,566 39,566  
Other assets 25,796 26,521 26,521  
Non Recurring | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans held-for-sale 615 618 618  
Derivatives, Other | Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Other Liabilities, Fair Value Disclosure 5,663 5,684 5,684  
Other assets 233      
Level 3 | Residential Real Estate        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans held-for-sale 18,949 19,544 19,544  
Level 3 | Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Securities available-for-sale 2,733 1,270 1,270  
Loans held-for-sale 18,334 18,926 18,926  
Other Liabilities, Fair Value Disclosure 5,645 5,645 5,645  
Other assets 0 0 0  
Level 3 | Non Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans, net of unearned income 28,873 26,666 26,666  
OREO 32,375 39,566 39,566  
Other assets 25,796 26,521 26,521  
Level 3 | Non Recurring | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans held-for-sale 615 618 618  
Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Other Liabilities, Fair Value Disclosure 5,645 5,645 5,645  
Level 3 | Derivatives, Other | Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Other Liabilities, Fair Value Disclosure 5,645 5,645 5,645  
Other assets 0      
Loans Held For Sale - SBA | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans held-for-sale 1,435 1,473 1,473  
Other Assets | Level 3 | Non Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Other assets $ 25,796 26,521 $ 26,521  
Discounted cash flow | Loans Held-For-Sale | Level 3 | Residential Real Estate        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Discounted cash flow   Discounted cash flow  
Discounted cash flow | Loans Held For Sale - SBA | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Discounted cash flow   Discounted cash flow  
Discounted cash flow | Derivative Liabilities, Other | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Discounted cash flow   Discounted cash flow  
Discounted cash flow | Other Assets | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Discounted cash flow   Discounted cash flow  
Appraisals from comparable properties | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Appraisals from comparable properties   Appraisals from comparable properties  
Appraisals from comparable properties | Real Estate Acquired By Foreclosure | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Appraisals from comparable properties   Appraisals from comparable properties  
Appraisals from comparable properties | Other Assets | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Appraisals from comparable properties   Appraisals from comparable properties  
Other collateral valuations | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Other collateral valuations   Other collateral valuations  
Minimum | Discounted cash flow | Derivative Liabilities, Other | Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Visa Covered Litigation Resolution Amount $ 4,200,000 $ 4,400,000    
Minimum | Discounted cash flow | Values Utilized | Loans Held For Sale - SBA | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Bond Equivalent Yield 9.00% 9.00%    
Minimum | Discounted cash flow | 2% - 11% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 2.00%      
Minimum | Discounted cash flow | 3% - 12% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | HELOC        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 3.00%      
Minimum | Discounted cash flow | 50% - 70% Percent Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Input Foreclosure Losses 50.00% 50.00%    
Minimum | Discounted cash flow | 5% - 25% Of Unpaid Principle Balance | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Loss Severity 5.00%      
Minimum | Discounted cash flow | Percent Of Unpaid Principle Balance | Loans Held-For-Sale | Level 3 | Residential Real Estate | HELOC        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Loss Severity 20.00% 15.00%    
Minimum | Discounted cash flow | 8% - 12% Values Utilized | Loans Held For Sale - SBA | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 8.00% 8.00%    
Minimum | Discounted cash flow | 10% - 30% Values Utilized | Derivative Liabilities, Other | Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Probability Of Resolution Scenarios 10.00% 10.00%    
Minimum | Discounted cash flow | 18 - 48 Months | Derivative Liabilities, Other | Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Time Until Resolution 18 months 18 months    
Minimum | Discounted cash flow | 0% - 15% Adjustment To Yield | Other Assets | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Adjustments To Current Sales Yields For Specific Properties 0.00% 0.00%    
Minimum | Discounted cash flow | 5% - 12% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | HELOC        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds   5.00%    
Minimum | Discounted cash flow | 5% - 12% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds   2.00%    
Minimum | Discounted cash flow | 5% - 30% Percent Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Loss Severity   5.00%    
Minimum | Appraisals from comparable properties | 0% -10% Of Appraisal | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Marketability adjustments for specific properties 0.00% 0.00%    
Minimum | Appraisals from comparable properties | 0% -10% Of Appraisal | Real Estate Acquired By Foreclosure | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Adjustment For Value Changes Since Appraisal 0.00% 0.00%    
Minimum | Appraisals from comparable properties | 0% - 25% Of Appraisal | Other Assets | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Marketability adjustments for specific properties 0.00% 0.00%    
Minimum | Other collateral valuations | 20% - 50% Of Gross Value | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Borrowing Base Certificates 20.00% 20.00%    
Minimum | Other collateral valuations | 0% - 25% Of Reported Value | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Financial Statements Auction Values 0.00% 0.00%    
Maximum | Discounted cash flow | Derivative Liabilities, Other | Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Visa Covered Litigation Resolution Amount $ 5,000,000 $ 5,200,000    
Maximum | Discounted cash flow | Values Utilized | Loans Held For Sale - SBA | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Bond Equivalent Yield 10.00% 10.00%    
Maximum | Discounted cash flow | 2% - 11% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 11.00%      
Maximum | Discounted cash flow | 3% - 12% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | HELOC        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 12.00%      
Maximum | Discounted cash flow | 50% - 70% Percent Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Input Foreclosure Losses 70.00% 70.00%    
Maximum | Discounted cash flow | 5% - 25% Of Unpaid Principle Balance | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Loss Severity 25.00%      
Maximum | Discounted cash flow | Percent Of Unpaid Principle Balance | Loans Held-For-Sale | Level 3 | Residential Real Estate | HELOC        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Loss Severity 100.00% 100.00%    
Maximum | Discounted cash flow | 8% - 12% Values Utilized | Loans Held For Sale - SBA | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 12.00% 12.00%    
Maximum | Discounted cash flow | 10% - 30% Values Utilized | Derivative Liabilities, Other | Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Probability Of Resolution Scenarios 30.00% 30.00%    
Maximum | Discounted cash flow | 18 - 48 Months | Derivative Liabilities, Other | Level 3 | Derivatives, Other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Time Until Resolution 48 months 48 months    
Maximum | Discounted cash flow | 0% - 15% Adjustment To Yield | Other Assets | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Adjustments To Current Sales Yields For Specific Properties 15.00% 15.00%    
Maximum | Discounted cash flow | 5% - 12% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | HELOC        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds   12.00%    
Maximum | Discounted cash flow | 5% - 12% Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds   12.00%    
Maximum | Discounted cash flow | 5% - 30% Percent Values Utilized | Loans Held-For-Sale | Level 3 | Residential Real Estate | First Mortgages        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Loss Severity   30.00%    
Maximum | Appraisals from comparable properties | 0% -10% Of Appraisal | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Marketability adjustments for specific properties 10.00% 10.00%    
Maximum | Appraisals from comparable properties | 0% -10% Of Appraisal | Real Estate Acquired By Foreclosure | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Adjustment For Value Changes Since Appraisal 10.00% 10.00%    
Maximum | Appraisals from comparable properties | 0% - 25% Of Appraisal | Other Assets | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Marketability adjustments for specific properties 25.00% 25.00%    
Maximum | Other collateral valuations | 20% - 50% Of Gross Value | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Borrowing Base Certificates 50.00% 50.00%    
Maximum | Other collateral valuations | 0% - 25% Of Reported Value | Loans Net Of Unearned Income | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Financial Statements Auction Values 25.00% 25.00%    
SBAs | Non Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans held-for-sale $ 533,106 $ 466,977 $ 466,977  
SBAs | Level 3 | Non Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Loans held-for-sale 1,435 1,473 1,473  
Interest- only strips- AFS | Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Securities available-for-sale 2,733 1,270 1,270  
Interest- only strips- AFS | Level 3 | Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Securities available-for-sale $ 2,733 $ 1,270 $ 1,270  
Interest- only strips- AFS | Discounted cash flow | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques Discounted cash flow      
Interest- only strips- AFS | Minimum | Discounted cash flow | Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 11.00%      
Interest- only strips- AFS | Minimum | Discounted cash flow | 12% - 14% Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Bond Equivalent Yield 12.00%      
Interest- only strips- AFS | Maximum | Discounted cash flow | Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds 11.00%      
Interest- only strips- AFS | Maximum | Discounted cash flow | 12% - 14% Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Bond Equivalent Yield 14.00%      
Interest- only strips- AFS | Discounted cash flow | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Valuation Techniques     Discounted cash flow  
Interest- only strips- AFS | Minimum | Discounted cash flow | 10% - 12% Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds   10.00%    
Interest- only strips- AFS | Minimum | Discounted cash flow | 17% Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Bond Equivalent Yield   17.00%    
Interest- only strips- AFS | Maximum | Discounted cash flow | 10% - 12% Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Prepayment Speeds   11.00%    
Interest- only strips- AFS | Maximum | Discounted cash flow | 17% Values Utilized | Available-for-sale Securities | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Fair Value Inputs, Bond Equivalent Yield   17.00%    
[1] March 31, 2018 and December 31, 2017 include $21.5 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] March 31, 2018 and December 31, 2017 include $6.4 million and $6.3 million, respectively, of foreclosed residential real estate.