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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks $ 288,933   $ 327,440      
Overnight investments 949,899   797,406      
Investment securities held to maturity 2,145,943   2,184,653      
Investment in marketable equity securities 116,854   92,599      
Loans held for sale 83,256   45,505      
Loans and Leases Receivable, Net Amount 26,969,686   25,299,564      
Income earned not collected 117,123   109,903      
Mortgage servicing rights 20,571 $ 20,665 21,396 $ 21,633 $ 21,657 $ 21,945
Deposits 32,743,277   30,672,460      
Securities sold under customer repurchase agreements 522,195   543,936      
Federal Home Loan Bank borrowings 192,672   193,556      
FDIC shared-loss payable 110,586   105,618      
Carrying Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 288,933   327,440      
Overnight investments 949,899   797,406      
Debt Securities, Available-for-sale 4,904,883   4,557,110      
Investment securities held to maturity 2,145,943   2,184,653      
Investment in marketable equity securities 116,854   92,599      
Loans held for sale 83,256   45,505      
Loans and Leases Receivable, Net Amount 26,969,686   25,299,564      
Income earned not collected 117,123   109,903      
Stock issued by Federal Home Loan Bank 25,355   25,304      
Mortgage servicing rights 22,431   24,066      
Deposits 32,743,277   30,672,460      
Securities sold under customer repurchase agreements 522,195   543,936      
Federal Home Loan Bank borrowings 192,672   193,556      
Short-term borrowings 149,051   140,741      
Long-term obligations 112,153   13,921      
FDIC shared-loss payable 110,586   105,618      
Accrued interest payable 17,859   3,712      
Fair Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 288,933   327,440      
Overnight investments 949,899   797,406      
Debt Securities, Available-for-sale 4,904,883   4,557,110      
Investment securities held to maturity 2,217,800   2,201,502      
Investment in marketable equity securities 116,854   92,599      
Loans held for sale 83,256   45,505      
Loans and Leases Receivable, Net Amount 27,301,164   24,845,060      
Income earned not collected 117,123   109,903      
Stock issued by Federal Home Loan Bank 25,355   25,304      
Mortgage servicing rights 24,823   27,435      
Deposits 32,739,923   30,623,214      
Securities sold under customer repurchase agreements 522,195   543,936      
Federal Home Loan Bank borrowings 199,098   195,374      
Short-term borrowings 156,566   151,670      
Long-term obligations 117,630   13,985      
FDIC shared-loss payable 113,309   105,846      
Accrued interest payable $ 17,859   $ 3,712