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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks $ 260,525   $ 336,150      
Overnight investments 1,223,311   1,387,927      
Investment securities available for sale 4,783,507   7,180,180      
Investment securities held to maturity 2,299,774   76      
Marketable equity securities 107,264   0      
Loans held for sale 58,961   51,179      
Loans and Leases Receivable, Net Amount 24,313,572   23,374,932      
Income earned not collected 99,567   95,249      
Mortgage servicing rights 21,657 $ 21,659 21,945 $ 20,524 $ 20,771 $ 20,415
Deposits 30,408,884   29,266,275      
FDIC shared-loss payable 103,487 $ 102,466 101,342 $ 99,126 $ 98,013 $ 97,008
Carrying Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 260,525   336,150      
Overnight investments 1,223,311   1,387,927      
Investment securities available for sale 4,783,507   7,180,180      
Investment securities held to maturity 2,299,774   76      
Marketable equity securities 107,264   0      
Loans held for sale 58,961   51,179      
Loans and Leases Receivable, Net Amount 24,313,572   23,374,932      
Income earned not collected 99,567   95,249      
Stock issued by Federal Home Loan Bank 22,658   52,685      
Mortgage servicing rights 21,657   21,945      
Deposits 30,408,884   29,266,275      
Short-term borrowings 613,993   693,807      
Long-term obligations 241,360   870,240      
FDIC shared-loss payable 103,487   101,342      
Accrued interest payable 1,909   3,952      
Fair Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 260,525   336,150      
Overnight investments 1,223,311   1,387,927      
Investment securities available for sale 4,783,507   7,180,180      
Investment securities held to maturity 2,302,093   81      
Marketable equity securities 107,264   0      
Loans held for sale 58,961   51,179      
Loans and Leases Receivable, Net Amount 23,704,523   22,257,803      
Income earned not collected 99,567   95,249      
Stock issued by Federal Home Loan Bank 22,658   52,685      
Mortgage servicing rights 28,668   26,170      
Deposits 30,362,605   29,230,768      
Short-term borrowings 613,993   693,807      
Long-term obligations 250,823   852,112      
FDIC shared-loss payable 103,966   102,684      
Accrued interest payable $ 1,909   $ 3,952