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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
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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

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