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Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis Using Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total net gains (losses) included in, Other noninterest expense $ 50,134 $ 53,947  
Municipal Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of assets, Beginning balance $ 0 4,164  
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale   2  
Total net gains (losses) included in, Fixed income securities gains (losses), net   31  
Total net gains (losses) included in, Other comprehensive income (loss)   127  
Total net gains (losses) included in, Sales    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1,859)  
Fair value of assets, Ending balance $ 0 2,465  
Banks, Trust and Insurance, Equities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of assets, Beginning balance $ 0 393,007  
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale   257  
Total net gains (losses) included in, Fixed income securities gains (losses), net   (323)  
Total net gains (losses) included in, Other comprehensive income (loss)   (6,949)  
Fair Value of Securities Reclassified from HTM to AFS   57,308  
Total net gains (losses) included in, Sales 2,613  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2,349)  
Fair value of assets, Ending balance $ 0 438,338  
Other Asset-Backed [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of assets, Beginning balance $ 0 $ 4,786  
Total net gains (losses) included in, Accretion of purchase discount on securities available-for-sale    
Total net gains (losses) included in, Fixed income securities gains (losses), net    
Total net gains (losses) included in, Other comprehensive income (loss)   $ 42  
Total net gains (losses) included in, Sales  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements $ (2)  
Fair value of assets, Ending balance $ 0 4,826  
Private Equity Investments [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of assets, Beginning balance 120,027 99,865  
Total net gains (losses) included in, Dividends and other investment income (1,484) 1,074  
Total net gains (losses) included in, Equity securities gains, net (2,009) 3,253  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2,801 5,052  
Total net gains (losses) included in, Sales (36) (1,517)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (77) (279)  
Fair value of assets, Ending balance 119,222 107,448  
Servicing Contracts [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of liabilities, Beginning balance 13,514 12,227  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Noninterest Income 3,460 4  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 368 171  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (275) (401)  
Fair value of liabilities, Ending balance 17,067 12,001  
Derivatives [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of liabilities, Beginning balance $ 0 (13)  
Total net gains (losses) included in, Other noninterest expense   $ 13  
Total net gains (losses) included in, Purchases  
Fair value of liabilities, Ending balance $ 0 $ 0  
Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other Assets, Fair Value Disclosure 82,179   $ 84,570
Other Liabilities, Fair Value Disclosure 82,179   84,570
Other Postretirement Benefits, Individual Contracts, Type of Deferred Compensation [Domain] | Estimate of Fair Value Measurement [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other Assets, Fair Value Disclosure 82,179   84,570
Other Liabilities, Fair Value Disclosure $ 82,179   $ 84,570