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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks $ 556,772   $ 539,741      
Overnight investments 2,882,789   1,872,594      
Investment securities available for sale 6,596,450   7,006,580      
Investment securities held to maturity 80   98      
Loans held for sale 154,534   74,401      
Loans and Leases Receivable, Net Amount 22,642,667   21,519,083      
FDIC shared-loss receivable 3,766 $ 3,981 4,172 $ 5,281 $ 7,474 $ 4,054
Income earned not collected 86,640   79,839      
Mortgage servicing rights 20,524 $ 20,771 20,415 $ 16,824 $ 17,186 $ 19,351
Deposits 29,456,338   28,161,343      
FDIC shared-loss payable 99,126   97,008      
Carrying Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 556,772   539,741      
Overnight investments 2,882,789   1,872,594      
Investment securities available for sale 6,596,450   7,006,580      
Investment securities held to maturity 80   98      
Loans held for sale 154,534   74,401      
Loans and Leases Receivable, Net Amount 22,642,667   21,519,083      
FDIC shared-loss receivable 3,766   4,172      
Income earned not collected 86,640   79,839      
Stock issued by Federal Home Loan Bank 53,085   43,495      
Mortgage servicing rights 20,524   20,415      
Deposits 29,456,338   28,161,343      
Short-term borrowings 784,517   603,487      
Long-term obligations 879,957   832,942      
FDIC shared-loss payable 99,126   97,008      
Accrued interest payable 5,141   3,797      
Fair Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 556,772   539,741      
Overnight investments 2,882,789   1,872,594      
Investment securities available for sale 6,596,450   7,006,580      
Investment securities held to maturity 86   104      
Loans held for sale 155,377   74,401      
Loans and Leases Receivable, Net Amount 21,705,640   20,614,548      
FDIC shared-loss receivable 3,766   4,172      
Income earned not collected 86,640   79,839      
Stock issued by Federal Home Loan Bank 53,085   43,495      
Mortgage servicing rights 25,194   24,446      
Deposits 29,425,034   28,135,698      
Short-term borrowings 784,517   603,487      
Long-term obligations 869,276   832,201      
FDIC shared-loss payable 101,839   100,069      
Accrued interest payable $ 5,141   $ 3,797