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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets $ 13,044 $ 16,265
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 13,044 16,265
Gross Amount Recognized, Resell agreements, Financial assets 4,898 7,898
Gross Amount Offset, Resell agreements, Financial assets 0 0
Net Amount Recognized, Resell agreements, Financial assets 4,898 7,898
Gross Amount Recognized, Financial assets 17,942 24,163
Gross Amount Offset, Financial assets 0 0
Net Amount Recognized, Financial assets 17,942 24,163
Gross Amount Recognized, Derivatives, Financial liabilities 46,786 42,603
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities 46,786 42,603
Gross Amount Recognized, Repurchase agreements, Financial liabilities 514,410 668,053
Gross Amount Offset, Repurchase agreements, Financial liabilities 0 0
Net Amount Recognized, Repurchase agreements, Financial liabilities 514,410 668,053
Gross Amount Recognized, Financial liabilities 561,196 710,656
Gross Amount Offset, Financial liabilities 0 0
Net Amount Recognized, Financial Liabilities 561,196 710,656
Loan/lease interest rate swaps and caps [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets 9,862 12,268
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 9,862 12,268
Commodity swaps and options [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets 3,180 3,907
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 3,180 3,907
Gross Amount Recognized, Derivatives, Financial liabilities 9,625 5,916
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities 9,625 5,916
Foreign currency forward contracts [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial assets 2 90
Gross Amount Offset, Derivatives, Financial assets 0 0
Net Amount Recognized, Derivatives, Financial assets 2 90
Gross Amount Recognized, Derivatives, Financial liabilities 250 27
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities 250 27
Loan/lease interest rate swaps [Member]
    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivatives, Financial liabilities 36,911 36,660
Gross Amount Offset, Derivatives, Financial liabilities 0 0
Net Amount Recognized, Derivatives, Financial liabilities $ 36,911 $ 36,660