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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Assets | $ 34,081 | $ 5,266
Gross Amount Offset, Derivatives, Financial assets | 0 | 0
Net Amount Recognized, Derivatives, Financial assets | 34,081 | 5,266
Gross Amount Recognized, Resell agreements, Financial assets | 20,000 | 31,299
Gross Amount Offset, Resell agreements, Financial assets | 0 | 0
Net Amount Recognized, Resell agreements, Financial assets | 20,000 | 31,299
Gross Amount Recognized, Financial assets | 54,081 | 36,565
Gross Amount Offset, Financial assets | 0 | 0
Net Amount Recognized, Financial assets | 54,081 | 36,565
Gross Amount Recognized, Derivatives, Financial Liabilities | 46,942 | 26,640
Gross Amount Offset, Derivatives, Financial liabilities | 0 | 0
Net Amount Recognized, Derivatives, Financial liabilities | 46,942 | 26,640
Gross Amount Recognized, Repurchase agreements, Financial liabilities | 1,553,109 | 1,668,142
Gross Amount Offset, Repurchase agreements, Financial liabilities | 0 | 0
Net Amount Recognized, Repurchase agreements, Financial liabilities | 1,553,109 | 1,668,142
Gross Amount Recognized, Financial liabilities | 1,600,051 | 1,694,782
Gross Amount Offset, Financial liabilities | 0 | 0
Net Amount Recognized, Financial Liabilities | 1,600,051 | 1,694,782
Loan/lease interest rate swaps and caps [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Assets | 1,302 | 339
Gross Amount Offset, Derivatives, Financial assets | 0 | 0
Net Amount Recognized, Derivatives, Financial assets | 1,302 | 339
Commodity swaps and options [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Assets | 32,773 | 4,927
Gross Amount Offset, Derivatives, Financial assets | 0 | 0
Net Amount Recognized, Derivatives, Financial assets | 32,773 | 4,927
Gross Amount Recognized, Derivatives, Financial Liabilities | 8,227 | 6,986
Gross Amount Offset, Derivatives, Financial liabilities | 0 | 0
Net Amount Recognized, Derivatives, Financial liabilities | 8,227 | 6,986
Foreign currency forward contracts [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Assets | 6 |
Gross Amount Offset, Derivatives, Financial assets | 0 |
Net Amount Recognized, Derivatives, Financial assets | 6 |
Gross Amount Recognized, Derivatives, Financial Liabilities | 9 | 33
Gross Amount Offset, Derivatives, Financial liabilities | 0 | 0
Net Amount Recognized, Derivatives, Financial liabilities | 9 | 33
Loan/lease interest rate swaps [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivatives, Financial Liabilities | 38,706 | 19,621
Gross Amount Offset, Derivatives, Financial liabilities | 0 | 0
Net Amount Recognized, Derivatives, Financial liabilities | $ 38,706 | $ 19,621

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