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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial Assets $ 16,036 $ 29,921
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 16,036 29,921
Gross Amount Recognized, Resell agreements, Financial assets 13,642 9,642
Gross Amount Offset, Resell agreements, Financial assets 0 0
Net Amount Recognized, Resell agreements, Financial assets 13,642 9,642
Gross Amount Recognized, Financial assets 29,678 39,563
Gross Amount Offset, Financial assets 0 0
Net Amount Recognized, Financial assets 29,678 39,563
Gross Amount Recognized, Derivatives, Financial Liabilities 52,291 47,898
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities 52,291 47,898
Gross Amount Recognized, Repurchase agreements, Financial liabilities 618,504 791,119
Gross Amount Offset, Repurchase agreements, Financial liabilities 0 0
Net Amount Recognized, Repurchase agreements, Financial liabilities 618,504 791,119
Gross Amount Recognized, Financial liabilities 670,795 839,017
Gross Amount Offset, Financial liabilities 0 0
Net Amount Recognized, Financial Liabilities 670,795 839,017
Loan/lease interest rate swaps and caps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial Assets 893 2,191
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 893 2,191
Commodity swaps and options [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial Assets 15,139 27,064
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 15,139 27,064
Gross Amount Recognized, Derivatives, Financial Liabilities 2,231 5,765
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities 2,231 5,765
Foreign currency forward contracts [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial Assets 4 666
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 4 666
Gross Amount Recognized, Derivatives, Financial Liabilities 19 2
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities 19 2
Loan/lease interest rate swaps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial Liabilities 50,041 42,131
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities $ 50,041 $ 42,131