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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 Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Fair Value	$ 2,571,139	$ 2,376,860
Fair Value, Measurements, Recurring
Assets
Assets, fair value	3,775,071	3,481,980
Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	7,747	2,373
Asset-backed securities
Assets
Fair Value	58,234	92,629
Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	58,234	92,629
Agency-guaranteed residential mortgage-backed securities
Assets
Fair Value	86,412
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	86,412
Agency-guaranteed residential collateralized mortgage obligations
Assets
Fair Value	124,958	116,908
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	124,958	116,908
Agency-guaranteed commercial collateralized mortgage obligations
Assets
Fair Value	33,774
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	33,774
Collateralized loan obligations
Assets
Fair Value	584,495	489,092
Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	584,495	489,092
Commercial mortgage-backed securities
Assets
Fair Value	112,626	121,636
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	112,626	121,636
Corporate notes
Assets
Fair Value	610,470	583,034
Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	610,470	583,034
Private label collateralized mortgage obligations
Assets
Fair Value	960,170	973,561
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	960,170	973,561
Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	21,437	17,931
Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	219,885	189,277
Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	962,610	897,912
Derivatives  | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	31,958	27,110
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	7,747	2,373
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives  | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Significant Other Observable Inputs (Level 2)
Assets
Fair Value	2,542,876	2,341,911
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	3,527,716	3,258,944
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Significant Other Observable Inputs (Level 2) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	29,971	57,680
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	86,412
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	124,958	116,908
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	33,774
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	584,495	489,092
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	112,626	121,636
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	610,470	583,034
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	960,170	973,561
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	21,360	17,906
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	870	1,215
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	962,610	897,912
Significant Other Observable Inputs (Level 2) | Derivatives  | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	31,958	27,110
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3)
Assets
Fair Value	28,263	34,949
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	247,355	223,036
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	7,747	2,373
Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets
Fair Value	28,263	34,949
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	28,263	34,949
Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0
Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	77	25
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	219,015	188,062
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Derivatives  | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	0	0
Significant Unobservable Inputs (Level 3) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	$ 7,747	$ 2,373

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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