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Balance Sheet Offsetting - Financial Instruments Derivative Assets Liabilities and Resell Agreements Net of Amount Not Offset (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | $ 34,988 | $ 23,339
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (28,281) | (23,339)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | (6,707) | 0
Net Amount, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Resell agreements, Financial Assets | 0 | 7,903
Gross Amounts Not Offset Financial Instruments, Resell Agreements | 0 | 0
Gross Amounts Not Offset Collateral, Resell Agreements, Financial Assets | 0 | (7,903)
Net Amount, Financial Assets, Resell Agreements | 0 | 0
Net Amount Recognized, Total Financial Assets | 34,988 | 31,242
Gross Amounts Not Offset Collateral, Financial Assets | (6,707) | (7,903)
Net Amount, Financial Assets | 0 | 0
Net Amount Recognized, Derivatives, Financial Liabilities | 245,964 | 114,019
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (28,281) | (23,339)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (217,683) | (90,573)
Net Amount, Derivatives, Financial Liabilities | 0 | 107
Net Amount Recognized, Repurchase Agreements, Financial Liabilities | 1,842,618 | 2,740,799
Gross Amounts Not Offset Financial Instruments, Repurchase Agreements, Financial Liabilities | 0 | 0
Gross Amounts Not Offset Collateral, Repurchase Agreements, Financial Liabilities | (1,842,618) | (2,740,799)
Net Amount, Repurchase Agreements, Financial Liabilities | 0 | 0
Net Amount Recognized, Financial Liabilities | 2,088,582 | 2,854,818
Gross Amounts Not Offset Collateral, Financial Liabilities | (2,060,301) | (2,831,372)
Net Amount, Financial Liabilities | 0 | 107
Counterparty A [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 32 | 6
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (32) | (6)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | 0 | 0
Net Amount, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivatives, Financial Liabilities | 2,635 | 3,870
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (32) | (6)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (2,603) | (3,864)
Net Amount, Derivatives, Financial Liabilities | 0 | 0
Counterparty B [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 11,998 | 7,655
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (11,998) | (7,655)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | 0 | 0
Net Amount, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivatives, Financial Liabilities | 46,953 | 28,130
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (11,998) | (7,655)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (34,955) | (20,475)
Net Amount, Derivatives, Financial Liabilities | 0 | 0
Counterparty C [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Liabilities | 3 | 9
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | 0 | 0
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (3) | (9)
Net Amount, Derivatives, Financial Liabilities | 0 | 0
Other Counterparties [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Net Amount Recognized, Derivatives, Financial Assets | 22,958 | 15,678
Gross Amounts Not Offset, Financial Instruments, Total Derivatives, Financial Assets | (16,251) | (15,678)
Gross Amount Not Offset Collateral, Derivatives, Financial Assets | (6,707) | 0
Net Amount, Derivatives, Financial Assets | 0 | 0
Net Amount Recognized, Derivatives, Financial Liabilities | 196,373 | 82,010
Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities | (16,251) | (15,678)
Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities | (180,122) | (66,225)
Net Amount, Derivatives, Financial Liabilities | $ 0 | $ 107

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