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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, 2022	Dec. 31, 2021
Fair Value, Measurements, Recurring
Assets
Assets, fair value	$ 4,329,084	$ 6,118,942
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Assets, available-for-sale, fair value	160,542	297,425
Fair Value, Measurements, Recurring | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, available-for-sale, fair value		9,553
Fair Value, Measurements, Recurring | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value		2,152
Fair Value, Measurements, Recurring | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	133,864	196,930
Fair Value, Measurements, Recurring | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value		238,844
Fair Value, Measurements, Recurring | Collateralized loan obligations
Assets
Assets, available-for-sale, fair value	872,738	1,066,802
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value	136,357	148,927
Fair Value, Measurements, Recurring | Corporate notes
Assets
Assets, available-for-sale, fair value	595,253	580,046
Fair Value, Measurements, Recurring | Private label collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	1,062,261	1,242,465
Fair Value, Measurements, Recurring | State and political subdivision debt securities
Assets
Assets, available-for-sale, fair value		8,431
Fair Value, Measurements, Recurring | Derivatives
Assets
Assets, fair value	44,435	27,295
Liabilities
Liabilities, fair value	42,106	26,544
Fair Value, Measurements, Recurring | Loans held for sale – fair value option
Assets
Assets, fair value	322	15,747
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, fair value	1,323,312	2,284,325
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 mortgage-backed securities
Assets
Assets, available-for-sale, fair value		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value		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) | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value		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) | State and political subdivision debt securities
Assets
Assets, available-for-sale, fair value		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	4,255,763	5,975,878
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Assets
Assets, available-for-sale, fair value	87,276	154,540
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, available-for-sale, fair value		9,553
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value		2,152
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	133,864	196,930
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value		238,844
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations
Assets
Assets, available-for-sale, fair value	872,738	1,066,802
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value	136,357	148,927
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes
Assets
Assets, available-for-sale, fair value	595,253	580,046
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value	1,062,261	1,242,465
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | State and political subdivision debt securities
Assets
Assets, available-for-sale, fair value		8,431
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives
Assets
Assets, fair value	44,380	27,116
Liabilities
Liabilities, fair value	42,106	26,544
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Assets
Assets, fair value	322	15,747
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets, fair value	1,323,312	2,284,325
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Assets, fair value	73,321	143,064
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets
Assets, available-for-sale, fair value	73,266	142,885
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities
Assets
Assets, available-for-sale, fair value		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets, available-for-sale, fair value		0
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) | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets, available-for-sale, fair value		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) | State and political subdivision debt securities
Assets
Assets, available-for-sale, fair value		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives
Assets
Assets, fair value	55	179
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	0	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	4,819	5,121
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans
Assets
Assets, fair value	4,819	5,121
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	4,819	5,121
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans
Assets
Assets, fair value	$ 4,819	$ 5,121

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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