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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Cumulative effect on retained earnings $ (1,064,322)   $ (1,045,478) $ (1,049,076)    
Accrued interest receivable 71,830   36,781      
Allowance for loan and lease losses 235,313     154,343    
COVID-19 Deferral Program Loans [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Accrued interest receivable 43,100          
Allowance for loan and lease losses 826          
Interest receivable, current status 39,200          
Retained Earnings [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Cumulative effect on retained earnings (284,053) $ (264,724) (279,646) $ (285,854) $ (284,459) $ (253,040)
Accounting Standards Update 2016-13 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Accrued interest receivable on available-for-sale debt securities 1,600   4,100      
Accrued interest receivable on loans $ 70,200   32,700      
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Cumulative Effect, Period Of Adoption, Adjustment [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Cumulative effect on retained earnings   $ 0 $ 25,494   $ 0 $ 0