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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets $ 14,543 $ 29,921
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 14,543 29,921
Gross Amount Recognized, Resell Agreements, Financial Assets 13,442 9,642
Gross Amount Offset, Resell Agreements, Financial Assets 0 0
Net Amount Recognized, Resell Agreements, Financial Assets 13,442 9,642
Gross Amount Recognized, Financial Assets 27,985 39,563
Gross Amount Offset, Financial Assets 0 0
Net Amount Recognized, Financial Assets 27,985 39,563
Gross Amount Recognized, Derivative, Financial Liabilities 40,198 47,898
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities 40,198 47,898
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities 883,947 791,119
Gross Amount Offset, Repurchase Agreements, Financial Liabilities 0 0
Net Amount Recognized, Repurchase Agreements, Financial Liabilities 883,947 791,119
Gross Amount Recognized, Financial Liabilities 924,145 839,017
Gross Amount Offset, Financial Liabilities 0 0
Net Amount Recognized, Financial Liabilities 924,145 839,017
Loan Lease Interest Rate Swaps And Caps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets 1,318 2,191
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 1,318 2,191
Commodity Swaps And Options [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets 13,210 27,064
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 13,210 27,064
Gross Amount Recognized, Derivative, Financial Liabilities 352 5,765
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities 352 5,765
Foreign Currency Forward Contracts [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets 15 666
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 15 666
Gross Amount Recognized, Derivative, Financial Liabilities 23 2
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities 23 2
Loan Lease Interest Rate Swaps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Liabilities 39,823 42,131
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities $ 39,823 $ 42,131