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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, 2021	Dec. 31, 2020
Fair Value, Measurements, Recurring
Assets
Assets	$ 6,118,942	$ 4,886,449
Fair Value, Measurements, Recurring | Equity securities
Assets
Assets		3,854
Fair Value, Measurements, Recurring | Derivatives
Assets
Assets	27,295	54,223
Liabilities
Liabilities	26,544	98,164
Fair Value, Measurements, Recurring | Loans held for sale – fair value option
Assets
Assets	15,747	5,509
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option
Assets
Assets	2,284,325	3,616,432
Fair Value, Measurements, Recurring | AFS debt securities | Asset-backed securities
Assets
Assets	297,425	377,145
Fair Value, Measurements, Recurring | AFS debt securities | U.S. government agencies securities
Assets
Assets		20,034
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets	9,553	63,091
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	2,152
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets	196,930	140,841
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	238,844
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets		20,926
Fair Value, Measurements, Recurring | AFS debt securities | Collateralized loan obligations
Assets
Assets	1,066,802	32,367
Fair Value, Measurements, Recurring | AFS debt securities | Commercial mortgage-backed securities
Assets
Assets	148,927
Fair Value, Measurements, Recurring | AFS debt securities | Corporate notes
Assets
Assets	580,046	396,744
Fair Value, Measurements, Recurring | AFS debt securities | Private label collateralized mortgage obligations
Assets
Assets	1,242,465	136,992
Fair Value, Measurements, Recurring | AFS debt securities | State and political subdivision debt securities
Assets
Assets	8,431	18,291
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets	0	3,854
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets
Assets		3,854
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives
Assets
Assets	0	0
Liabilities
Liabilities	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	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	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Asset-backed securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | U.S. government agencies securities
Assets
Assets		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Collateralized loan obligations
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Commercial mortgage-backed securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Corporate notes
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Private label collateralized mortgage obligations
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | State and political subdivision debt securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Assets	5,975,878	4,882,395
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities
Assets
Assets		0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives
Assets
Assets	27,116	54,023
Liabilities
Liabilities	26,544	98,164
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Assets
Assets	15,747	5,509
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets	2,284,325	3,616,432
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Asset-backed securities
Assets
Assets	154,540	377,145
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | U.S. government agencies securities
Assets
Assets		20,034
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets	9,553	63,091
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	2,152
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets	196,930	140,841
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	238,844
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets		20,926
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Collateralized loan obligations
Assets
Assets	1,066,802	32,367
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Commercial mortgage-backed securities
Assets
Assets	148,927
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Corporate notes
Assets
Assets	580,046	396,744
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Private label collateralized mortgage obligations
Assets
Assets	1,242,465	136,992
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | State and political subdivision debt securities
Assets
Assets	8,431	18,291
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Assets	143,064	200
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities
Assets
Assets		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives
Assets
Assets	179	200
Liabilities
Liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Asset-backed securities
Assets
Assets	142,885	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | U.S. government agencies securities
Assets
Assets		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed residential mortgage-backed securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations
Assets
Assets		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Collateralized loan obligations
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Commercial mortgage-backed securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Corporate notes
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Private label collateralized mortgage obligations
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | State and political subdivision debt securities
Assets
Assets	0	0
Fair Value, Measurements, Nonrecurring
Assets
Assets	5,121	76,836
Fair Value, Measurements, Nonrecurring | Loans held for sale – fair value option
Assets
Assets		55,683
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans
Assets
Assets	5,121	21,118
Fair Value, Measurements, Nonrecurring | Other real estate owned
Assets
Assets		35
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option
Assets
Assets		0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans
Assets
Assets	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Assets
Assets		0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Assets
Assets	0	72,934
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Assets
Assets		55,683
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral-dependent loans
Assets
Assets	0	17,251
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate owned
Assets
Assets		0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Assets
Assets	5,121	3,902
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option
Assets
Assets		0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans
Assets
Assets	$ 5,121	3,867
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned
Assets
Assets		$ 35

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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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Fair value of financial and nonfinancial obligations.

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