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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, 2022	Dec. 31, 2021
Fair Value, Measurements, Recurring
Assets
Assets, fair value	$ 5,924,237	$ 6,118,942
Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	2,485	5,121
Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	343,619	297,425
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	8,269	9,553
Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	2,045	2,152
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	603,403	196,930
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	162,599	238,844
Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	1,004,362	1,066,802
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	147,625	148,927
Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	593,750	580,046
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	1,270,407	1,242,465
State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Fair Value	7,950	8,431
Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	21,954	27,295
Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,496	15,747
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	1,755,758	2,284,325
Derivatives  | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	18,370	26,544
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	2,485	5,121
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	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed commercial 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	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) | State and political subdivision debt securities | 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 warehouse – 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) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	5,802,235	5,975,878
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	221,766	154,540
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	8,269	9,553
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	2,045	2,152
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	603,403	196,930
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	162,599	238,844
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	1,004,362	1,066,802
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	147,625	148,927
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	593,750	580,046
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	1,270,407	1,242,465
Significant Other Observable Inputs (Level 2) | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Fair Value	7,950	8,431
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	21,805	27,116
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,496	15,747
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	1,755,758	2,284,325
Significant Other Observable Inputs (Level 2) | Derivatives  | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	18,370	26,544
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	122,002	143,064
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	2,485	5,121
Significant Unobservable Inputs (Level 3) | Asset-backed securities
Assets
Fair Value	121,853	142,885
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	121,853	142,885
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 commercial 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	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) | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) | Derivatives | Fair Value, Measurements, Recurring
Assets
Assets, fair value	149	179
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – 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	$ 2,485	$ 5,121

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