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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Assets | $ 5,266 | $ 27,849
Gross Amount Offset, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivative, Financial Assets | 5,266 | 27,849
Gross Amount Recognized, Resell Agreements, Financial Assets | 31,299 | 11,642
Gross Amount Offset, Resell Agreements, Financial Assets | 0 | 0
Net Amount Recognized, Resell Agreements, Financial Assets | 31,299 | 11,642
Gross Amount Recognized, Financial Assets | 36,565 | 39,491
Gross Amount Offset, Financial Assets | 0 | 0
Net Amount Recognized, Financial Assets | 36,565 | 39,491
Gross Amount Recognized, Derivative, Financial Liabilities | 26,640 | 11,185
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | 26,640 | 11,185
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities | 1,668,142 | 1,360,298
Gross Amount Offset, Repurchase Agreements, Financial Liabilities | 0 | 0
Net Amount Recognized, Repurchase Agreements, Financial Liabilities | 1,668,142 | 1,360,298
Gross Amount Recognized, Financial Liabilities | 1,694,782 | 1,371,483
Gross Amount Offset, Financial Liabilities | 0 | 0
Net Amount Recognized, Financial Liabilities | 1,694,782 | 1,371,483
Loan Lease Interest Rate Swaps And Caps [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Assets | 339 | 3,100
Gross Amount Offset, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivative, Financial Assets | 339 | 3,100
Commodity Swaps And Options [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Assets | 4,927 | 24,749
Gross Amount Offset, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivative, Financial Assets | 4,927 | 24,749
Gross Amount Recognized, Derivative, Financial Liabilities | 6,986 | 1,918
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | 6,986 | 1,918
Foreign Currency Forward Contracts [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Liabilities | 33 | 147
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | 33 | 147
Loan Lease Interest Rate Swaps [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Gross Amount Recognized, Derivative, Financial Liabilities | 19,621 | 9,120
Gross Amount Offset, Derivative, Financial Liabilities | 0 | 0
Net Amount Recognized, Derivative, Financial Liabilities | $ 19,621 | $ 9,120

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