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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets $ 14,360 $ 2,246
Gross Amount Offset, Derivatives, Financial assets      
Net Amount Recognized, Derivatives, Financial assets 14,360 2,246
Gross Amount Recognized, Resell agreements, Financial assets 4,898 4,898
Gross Amount Offset, Resell agreements, Financial assets      
Net Amount Recognized, Resell agreements, Financial assets 4,898 4,898
Gross Amount Recognized, Financial assets 19,258 7,144
Gross Amount Offset, Financial assets     
Net Amount Recognized, Financial assets 19,258 7,144
Gross Amount Recognized, Derivatives, Financial liabilities 49,137 74,159
Gross Amount Offset, Derivatives, Financial liabilities      
Net Amount Recognized, Derivatives, Financial liabilities 49,137 74,159
Gross Amount Recognized, Repurchase agreements, Financial liabilities 549,073 559,461
Gross Amount Offset, Repurchase agreements, Financial liabilities      
Net Amount Recognized, Repurchase agreements, Financial liabilities 549,073 559,461
Gross Amount Recognized, Financial liabilities 598,210 633,620
Gross Amount Offset, Financial liabilities      
Net Amount Recognized, Financial liabilities 598,210 633,620
Loan/lease interest rate swaps [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial liabilities 45,142 68,180
Gross Amount Offset, Derivatives, Financial liabilities      
Net Amount Recognized, Derivatives, Financial liabilities 45,142 68,180
Interest rate swap on junior subordinated deferrable interest debentures [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial liabilities 2,201 4,365
Gross Amount Offset, Derivatives, Financial liabilities      
Net Amount Recognized, Derivatives, Financial liabilities 2,201 4,365
Commodity swaps and options [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets 4,824 2,207
Gross Amount Offset, Derivatives, Financial assets      
Net Amount Recognized, Derivatives, Financial assets 4,824 2,207
Gross Amount Recognized, Derivatives, Financial liabilities 1,794 1,614
Gross Amount Offset, Derivatives, Financial liabilities      
Net Amount Recognized, Derivatives, Financial liabilities 1,794 1,614
Foreign currency forward contracts [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets 590 3
Gross Amount Offset, Derivatives, Financial assets      
Net Amount Recognized, Derivatives, Financial assets 590 3
Gross Amount Recognized, Derivatives, Financial liabilities     
Gross Amount Offset, Derivatives, Financial liabilities     
Net Amount Recognized, Derivatives, Financial liabilities     
Loan/lease interest rate swaps and caps [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets 8,946 36
Gross Amount Offset, Derivatives, Financial assets      
Net Amount Recognized, Derivatives, Financial assets $ 8,946 $ 36