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Fair Value Measurements (Narrative) (Detail) - USD ($)
$ in Thousands
Jan. 13, 2015
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total credit-related financial instruments with off-balance sheet risk   $ 5,031,030 $ 4,547,484
Fair Value Inputs, Long-term Revenue Growth Rate 2.50%    
Fair Value Inputs, Annual Account Attrition Rate 13.00%    
Fair Value Inputs, Shock Attrition Rate 6.00%    
Discount rate 16.50%    
Fair Value Inputs, Control Premium 4.50%    
Rabbi Trust [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Other real estate owned   3,900  
Alternative investments [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total credit-related financial instruments with off-balance sheet risk   6,800  
Fair Value, Measurements, Nonrecurring [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value of other real estate owned (OREO) and repossessed assets   $ 5,000