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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, 2020	Dec. 31, 2019
Impaired loans, net of reserves
Assets
Impaired loans reserve		$ 852
Fair Value, Measurements, Recurring
Assets
Assets	$ 4,886,449	2,867,372
Fair Value, Measurements, Recurring | Interest-only GNMA securities
Assets
Assets		16,272
Fair Value, Measurements, Recurring | Equity securities
Assets
Assets	3,854	2,406
Fair Value, Measurements, Recurring | Derivatives
Assets
Assets	54,223	23,608
Liabilities
Liabilities	98,164	45,939
Fair Value, Measurements, Recurring | Loans held for sale – fair value option
Assets
Assets	5,509	2,130
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option
Assets
Assets	3,616,432	2,245,758
Fair Value, Measurements, Recurring | AFS debt securities | Asset-backed securities
Assets
Assets	377,145
Fair Value, Measurements, Recurring | AFS debt securities | U.S. government agency securities
Assets
Assets	20,034
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed mortgage-backed securities
Assets
Assets	63,091	278,321
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed collateralized mortgage obligations
Assets
Assets	161,767
Fair Value, Measurements, Recurring | AFS debt securities | Collateralized loan obligations
Assets
Assets	32,367
Fair Value, Measurements, Recurring | AFS debt securities | Corporate notes
Assets
Assets	396,744	298,877
Fair Value, Measurements, Recurring | AFS debt securities | Private label collateralized mortgage obligations
Assets
Assets	136,992
Fair Value, Measurements, Recurring | AFS debt securities | State and political subdivision debt securities
Assets
Assets	18,291
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Assets	3,854	2,406
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest-only GNMA securities
Assets
Assets		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets
Assets	3,854	2,406
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
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | U.S. government agency securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed 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 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
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
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
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Assets	4,882,395	2,848,615
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest-only GNMA securities
Assets
Assets		0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives
Assets
Assets	54,023	23,529
Liabilities
Liabilities	98,164	45,939
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Assets
Assets	5,509	2,130
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option
Assets
Assets	3,616,432	2,245,758
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Asset-backed securities
Assets
Assets	377,145
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | U.S. government agency securities
Assets
Assets	20,034
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed mortgage-backed securities
Assets
Assets	63,091	278,321
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed collateralized mortgage obligations
Assets
Assets	161,767
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Collateralized loan obligations
Assets
Assets	32,367
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Corporate notes
Assets
Assets	396,744	298,877
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Private label collateralized mortgage obligations
Assets
Assets	136,992
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | State and political subdivision debt securities
Assets
Assets	18,291
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Assets	200	16,351
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest-only GNMA securities
Assets
Assets		16,272
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives
Assets
Assets	200	79
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	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | U.S. government agency securities
Assets
Assets	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed mortgage-backed securities
Assets
Assets	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed collateralized mortgage obligations
Assets
Assets	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Collateralized loan obligations
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
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | State and political subdivision debt securities
Assets
Assets	0
Fair Value, Measurements, Nonrecurring
Assets
Assets	76,836	14,350
Fair Value, Measurements, Nonrecurring | Loans held for sale – fair value option
Assets
Assets	55,683
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans
Assets
Assets	21,118
Fair Value, Measurements, Nonrecurring | Impaired loans, net of reserves
Assets
Assets		14,272
Fair Value, Measurements, Nonrecurring | Other real estate owned
Assets
Assets	35	78
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
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of reserves
Assets
Assets		0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Assets
Assets	0	0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Assets
Assets	72,934	0
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	17,251
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves
Assets
Assets		0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate owned
Assets
Assets	0	0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Assets
Assets	3,902	14,350
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	3,867
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves
Assets
Assets		14,272
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned
Assets
Assets	$ 35	$ 78

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Amount of allowance for credit losses related to recorded investment.

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