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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Assets | $ 11,111 | $ 5,266
Gross Amount Offset, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivative, Financial Assets | 11,111 | 5,266
Gross Amount Recognized, Resell Agreements, Financial Assets | 0 | 31,299
Gross Amount Offset, Resell Agreements, Financial Assets | 0 | 0
Net Amount Recognized, Resell Agreements, Financial Assets | 0 | 31,299
Gross Amount Recognized, Financial Assets | 11,111 | 36,565
Gross Amount Offset, Financial Assets | 0 | 0
Net Amount Recognized, Financial Assets | 11,111 | 36,565
Gross Amount Recognized, Derivative, Financial Liabilities | 69,323 | 26,640
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | 69,323 | 26,640
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities | 2,068,147 | 1,668,142
Gross Amount Offset, Repurchase Agreements, Financial Liabilities | 0 | 0
Net Amount Recognized, Repurchase Agreements, Financial Liabilities | 2,068,147 | 1,668,142
Gross Amount Recognized, Financial Liabilities | 2,137,470 | 1,694,782
Gross Amount Offset, Financial Liabilities | 0 | 0
Net Amount Recognized, Financial Liabilities | 2,137,470 | 1,694,782
Loan Lease Interest Rate Swaps And Caps [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Assets | 1,241 | 339
Gross Amount Offset, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivative, Financial Assets | 1,241 | 339
Commodity Swaps And Options [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Assets | 9,870 | 4,927
Gross Amount Offset, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivative, Financial Assets | 9,870 | 4,927
Gross Amount Recognized, Derivative, Financial Liabilities | 35,377 | 6,986
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | 35,377 | 6,986
Foreign Currency Forward Contracts [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Liabilities | 0 | 33
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | 0 | 33
Loan Lease Interest Rate Swaps [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Liabilities | 33,946 | 19,621
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | $ 33,946 | $ 19,621

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