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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
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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

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