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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