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Loans And Allowance For Credit Losses (Summary of Activity in the Allowance For Credit Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Allowance for Credit Loss [Line Items]        
Balance, Asset $ 150,044 $ 220,834   $ 160,682
Provision for credit losses on loans (52,223) 116,049    
Loans charged off 35,627 50,047    
Recoveries on Loans 17,060 15,189    
Net loan charge-offs (recoveries) 18,567 34,858    
Balance, Liability 24,204 38,307 $ 17,165 1,075
Provision for credit losses on unfunded lending commitments (14,103) 21,142    
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS 174,248 259,141    
Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset     (21,039)  
Balance, Liability     16,090  
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset       (21,039)
Balance, Liability       16,090
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset       139,643
Balance, Liability       17,165
Commercial Portfolio Segment [Member]        
Allowance for Credit Loss [Line Items]        
Balance, Asset 97,776 121,549   91,760
Provision for credit losses on loans (28,594) 63,115    
Loans charged off 968 7,862    
Recoveries on Loans 5,789 4,247    
Net loan charge-offs (recoveries) (4,821) 3,615    
Balance, Liability 23,271 37,259   399
Provision for credit losses on unfunded lending commitments (13,988) 20,803    
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS 121,047 158,808    
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset     (29,711)  
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset       (29,711)
Balance, Liability       16,057
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset       62,049
Balance, Liability       16,456
Personal Banking Portfolio Segment [Member]        
Allowance for Credit Loss [Line Items]        
Balance, Asset 52,268 99,285   68,922
Provision for credit losses on loans (23,629) 52,934    
Loans charged off 34,659 42,185    
Recoveries on Loans 11,271 10,942    
Net loan charge-offs (recoveries) 23,388 31,243    
Balance, Liability 933 1,048   676
Provision for credit losses on unfunded lending commitments (115) 339    
ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LIABILITY FOR UNFUNDED LENDING COMMITMENTS $ 53,201 $ 100,333    
Personal Banking Portfolio Segment [Member] | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset     $ 8,672  
Personal Banking Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset       8,672
Balance, Liability       33
Personal Banking Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-13        
Allowance for Credit Loss [Line Items]        
Balance, Asset       77,594
Balance, Liability       $ 709