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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks $ 262,525   $ 336,150      
Overnight investments 943,025   1,387,927      
Investment securities available for sale 4,677,351   7,180,180      
Investment securities held to maturity 2,253,416   76      
Investment in marketable equity securities 109,907   0      
Loans held for sale 46,082   51,179      
Loans and Leases Receivable, Net Amount 24,667,150   23,374,932      
Income earned not collected 105,616   95,249      
Mortgage servicing rights 21,633 $ 21,657 21,945 $ 22,003 $ 20,524 $ 20,415
Deposits 30,163,537   29,266,275      
FDIC shared-loss payable 104,576 $ 103,487 101,342 $ 100,203 $ 99,126 $ 97,008
Carrying Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 262,525   336,150      
Overnight investments 943,025   1,387,927      
Investment securities available for sale 4,677,351   7,180,180      
Investment securities held to maturity 2,253,416   76      
Investment in marketable equity securities 109,907   0      
Loans held for sale 46,082   51,179      
Loans and Leases Receivable, Net Amount 24,667,150   23,374,932      
Income earned not collected 105,616   95,249      
Stock issued by Federal Home Loan Bank 28,438   52,685      
Mortgage servicing rights 21,633   21,945      
Deposits 30,163,537   29,266,275      
Short-term borrowings 687,749   693,807      
Long-term obligations 297,487   870,240      
FDIC shared-loss payable 104,576   101,342      
Accrued interest payable 2,400   3,952      
Fair Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 262,525   336,150      
Overnight investments 943,025   1,387,927      
Investment securities available for sale 4,677,351   7,180,180      
Investment securities held to maturity 2,238,664   81      
Investment in marketable equity securities 109,907   0      
Loans held for sale 46,082   51,179      
Loans and Leases Receivable, Net Amount 23,955,732   22,257,803      
Income earned not collected 105,616   95,249      
Stock issued by Federal Home Loan Bank 28,438   52,685      
Mortgage servicing rights 28,829   26,170      
Deposits 30,115,380   29,230,768      
Short-term borrowings 687,749   693,807      
Long-term obligations 303,935   852,112      
FDIC shared-loss payable 104,615   102,684      
Accrued interest payable $ 2,400   $ 3,952