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Disclosures about Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Non-recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Measurements, Recurring
Assets
Assets, fair value	$ 3,481,980	$ 4,329,084
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Assets, available-for-sale, fair value	92,629	160,542
Fair Value, Measurements, Recurring | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	116,908	133,864
Fair Value, Measurements, Recurring | Collateralized loan obligations
Assets
Assets, available-for-sale, fair value	489,092	872,738
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value	121,636	136,357
Fair Value, Measurements, Recurring | Corporate notes
Assets
Assets, available-for-sale, fair value	583,034	595,253
Fair Value, Measurements, Recurring | Private label collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	973,561	1,062,261
Fair Value, Measurements, Recurring | Derivatives
Assets
Assets, fair value	17,931	44,435
Liabilities
Liabilities, fair value	27,110	42,106
Fair Value, Measurements, Recurring | Loans held for sale – fair value option
Assets
Assets, fair value	189,277	322
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, fair value	897,912	1,323,312
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives
Assets
Assets, fair value	0	0
Liabilities
Liabilities, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option
Assets
Assets, fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, fair value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Assets, fair value	3,258,944	4,255,763
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Assets
Assets, available-for-sale, fair value	57,680	87,276
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	116,908	133,864
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations
Assets
Assets, available-for-sale, fair value	489,092	872,738
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value	121,636	136,357
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes
Assets
Assets, available-for-sale, fair value	583,034	595,253
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	973,561	1,062,261
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives
Assets
Assets, fair value	17,906	44,380
Liabilities
Liabilities, fair value	27,110	42,106
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Assets
Assets, fair value	1,215	322
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, fair value	897,912	1,323,312
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Assets, fair value	223,036	73,321
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets
Assets, available-for-sale, fair value	34,949	73,266
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate notes
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Private label collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives
Assets
Assets, fair value	25	55
Liabilities
Liabilities, fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option
Assets
Assets, fair value	188,062	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, fair value	0	0
Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	2,373	4,819
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans
Assets
Assets, fair value	2,373	4,819
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets, fair value	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans
Assets
Assets, fair value	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Assets
Assets, fair value	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral-dependent loans
Assets
Assets, fair value	0	0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Assets
Assets, fair value	2,373	4,819
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans
Assets
Assets, fair value	$ 2,373	$ 4,819

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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