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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks $ 296,386   $ 539,741      
Overnight investments 2,432,233   1,872,594      
Investment securities available for sale 6,992,877   7,006,580      
Investment securities held to maturity 78   98      
Loans held for sale 70,803   74,401      
Loans and Leases Receivable, Net Amount 22,917,231   21,519,083      
FDIC shared-loss receivable 4,610 $ 3,766 4,172 $ 3,108 $ 5,281 $ 4,054
Income earned not collected 90,821   79,839      
Mortgage servicing rights 22,003 $ 20,524 20,415 $ 17,730 $ 16,824 $ 19,351
Deposits 29,333,949   28,161,343      
FDIC shared-loss payable 100,203   97,008      
Carrying Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 296,386   539,741      
Overnight investments 2,432,233   1,872,594      
Investment securities available for sale 6,992,877   7,006,580      
Investment securities held to maturity 78   98      
Loans held for sale 70,803   74,401      
Loans and Leases Receivable, Net Amount 22,917,231   21,519,083      
FDIC shared-loss receivable 4,610   4,172      
Income earned not collected 90,821   79,839      
Stock issued by Federal Home Loan Bank 52,685   43,495      
Mortgage servicing rights 22,003   20,415      
Deposits 29,333,949   28,161,343      
Short-term borrowings 679,280   603,487      
Long-term obligations 866,123   832,942      
FDIC shared-loss payable 100,203   97,008      
Accrued interest payable 4,198   3,797      
Fair Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 296,386   539,741      
Overnight investments 2,432,233   1,872,594      
Investment securities available for sale 6,992,877   7,006,580      
Investment securities held to maturity 84   104      
Loans held for sale 70,803   74,401      
Loans and Leases Receivable, Net Amount 21,941,561   20,614,548      
FDIC shared-loss receivable 4,610   4,172      
Income earned not collected 90,821   79,839      
Stock issued by Federal Home Loan Bank 52,685   43,495      
Mortgage servicing rights 25,597   24,446      
Deposits 29,302,361   28,135,698      
Short-term borrowings 679,280   603,487      
Long-term obligations 865,876   832,201      
FDIC shared-loss payable 102,603   100,069      
Accrued interest payable $ 4,198   $ 3,797