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Principles Of Consolidation And Presentation (Adoption Impact of ASU 2016-13) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance $ 171,653   $ 160,682 $ 160,682 $ 159,932
Financing Receivable, Allowance for Credit Loss 171,653 $ 139,643      
Off-Balance Sheet, Credit Loss, Liability 32,250 17,165 1,075    
Loans and Leases Receivable and Liability for Unfunded Lending Commitments, Allowance     161,757    
Allowance for Credit Losses on Loans and Liability for Unfunded Lending Commitments, Total   156,808      
Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   (21,039)      
Off-Balance Sheet, Credit Loss, Liability   16,090      
Allowance for Credit Losses on Loans and Liability for Unfunded Lending Commitments, Total   (4,949)      
Commercial Portfolio Segment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     91,760 93,643 92,869
Financing Receivable, Allowance for Credit Loss 83,551 62,049      
Off-Balance Sheet, Credit Loss, Liability 31,061 16,456      
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   (29,711)      
Commercial Portfolio Segment [Member] | Business [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     44,268    
Financing Receivable, Allowance for Credit Loss   37,940      
Commercial Portfolio Segment [Member] | Business [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   (6,328)      
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     21,589    
Financing Receivable, Allowance for Credit Loss   9,204      
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   (12,385)      
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     25,903    
Financing Receivable, Allowance for Credit Loss   14,905      
Commercial Portfolio Segment [Member] | Real Estate - Business [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   (10,998)      
Personal Banking Portfolio Segment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     68,922 $ 67,039 $ 67,063
Financing Receivable, Allowance for Credit Loss 88,102 77,594      
Off-Balance Sheet, Credit Loss, Liability $ 1,189 709      
Personal Banking Portfolio Segment [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   8,672      
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     3,125    
Financing Receivable, Allowance for Credit Loss   4,855      
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   1,730      
Personal Banking Portfolio Segment [Member] | Consumer [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     15,932    
Financing Receivable, Allowance for Credit Loss   14,518      
Personal Banking Portfolio Segment [Member] | Consumer [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   (1,414)      
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     638    
Financing Receivable, Allowance for Credit Loss   1,624      
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   986      
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     47,997    
Financing Receivable, Allowance for Credit Loss   56,495      
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   8,498      
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Loans and Leases Receivable, Allowance     $ 1,230    
Financing Receivable, Allowance for Credit Loss   102      
Personal Banking Portfolio Segment [Member] | Overdrafts [Member] | Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing Receivable, Allowance for Credit Loss   $ (1,128)