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Principles Of Consolidation And Presentation (Adoption Impact of ASU 2016-13) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Loans and Leases Receivable, Allowance $ 240,744     $ 160,682 $ 161,182 $ 160,682 $ 159,932
Financing Receivable, Allowance for Credit Loss 240,744 $ 171,653 $ 139,643        
Off-Balance Sheet, Credit Loss, Liability 35,299 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 91,808 93,643 92,869
Financing Receivable, Allowance for Credit Loss 130,553 83,551 62,049        
Off-Balance Sheet, Credit Loss, Liability 34,052 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 $ 69,374 $ 67,039 $ 67,063
Financing Receivable, Allowance for Credit Loss 110,191 88,102 77,594        
Off-Balance Sheet, Credit Loss, Liability $ 1,247 $ 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)