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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	Sep. 30, 2025	Dec. 31, 2024
Assets
Fair Value	$ 1,979,832	$ 1,985,438
Derivatives	12,631	15,263
Loans held for sale – fair value option	2,469	163,891
Loans receivable, fair value option	15,831,500	14,104,884
Liabilities
Derivative liabilities	17,430	22,570
Fair Value, Measurements, Recurring
Assets
Derivatives	12,631	15,263
Loans held for sale – fair value option	2,469	163,891
Assets, fair value	3,593,546	3,485,720
Liabilities
Derivative liabilities	17,430	22,570
Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	23,749	18,048
Asset-backed securities
Assets
Fair Value	281,839	13,236
Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	281,839	13,236
Agency-guaranteed residential mortgage-backed securities
Assets
Fair Value	444,086	327,038
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	444,086	327,038
Agency-guaranteed residential collateralized mortgage obligations
Assets
Fair Value	482,614	226,746
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	482,614	226,746
Agency-guaranteed commercial collateralized mortgage obligations
Assets
Fair Value	94,789	93,075
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	94,789	93,075
Collateralized loan obligations
Assets
Fair Value	10,660	255,407
Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	10,660	255,407
Commercial mortgage-backed securities
Assets
Fair Value		77,708
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value		77,708
Corporate notes
Assets
Fair Value	299,432	516,330
Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	299,432	516,330
Private label collateralized mortgage obligations
Assets
Fair Value	366,412	475,898
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	366,412	475,898
Mortgage Finance | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	1,486,978	1,321,128
Installment Loans | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	111,636
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	11,317	18,048
Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	12,432
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Fair Value	0	0
Derivatives	0	0
Loans receivable, fair value option	0	0
Liabilities
Derivative liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets
Derivatives	0	0
Loans held for sale – fair value option	0	0
Assets, fair value	0	0
Liabilities
Derivative liabilities	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	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	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
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) | Mortgage Finance | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Installment Loans | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0
Significant Other Observable Inputs (Level 2)
Assets
Fair Value	1,697,993	1,972,202
Derivatives	12,613	15,223
Loans receivable, fair value option	1,486,978	1,321,128
Liabilities
Derivative liabilities	17,430	22,570
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets
Derivatives	12,613	15,223
Loans held for sale – fair value option	2,229	1,836
Assets, fair value	3,199,813	3,310,389
Liabilities
Derivative liabilities	17,430	22,570
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	0	0
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	444,086	327,038
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	482,614	226,746
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	94,789	93,075
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	10,660	255,407
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value		77,708
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	299,432	516,330
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	366,412	475,898
Significant Other Observable Inputs (Level 2) | Mortgage Finance | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	1,486,978	1,321,128
Significant Other Observable Inputs (Level 2) | Installment Loans | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	0
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0
Significant Unobservable Inputs (Level 3)
Assets
Fair Value	281,839	13,236
Derivatives	18	40
Loans receivable, fair value option	14,344,522	12,783,756
Liabilities
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Derivatives	18	40
Loans held for sale – fair value option	240	162,055
Assets, fair value	393,733	175,331
Liabilities
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	23,749	18,048
Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets
Fair Value	281,839	13,236
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	281,839	13,236
Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0	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	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
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) | Mortgage Finance | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	0	0
Significant Unobservable Inputs (Level 3) | Installment Loans | Fair Value, Measurements, Recurring
Assets
Loans receivable, fair value option	111,636
Significant Unobservable Inputs (Level 3) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	11,317	$ 18,048
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	$ 12,432

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