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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, 2021	Dec. 31, 2020
Fair Value, Measurements, Recurring
Assets
Assets, fair value	$ 4,465,714	$ 4,886,449
Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	25,155	76,836
Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	225,457	377,145
U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Fair Value		20,034
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	9,666	63,091
Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	2,194
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	102,194	140,841
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	141,808	20,926
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	28,088
Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	315,502	32,367
Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	440,892	396,744
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	587,241	136,992
State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Fair Value	8,655	18,291
Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value		3,854
Derivative asset | Fair Value, Measurements, Recurring
Assets
Assets, fair value	34,234	54,223
Loans held for sale | Fair Value, Measurements, Recurring
Assets
Assets, fair value	12,159	5,509
Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		55,683
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,557,624	3,616,432
Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	34,573	98,164
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	25,155	21,118
Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		35
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	3,854
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) | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Fair Value		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
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) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	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) | 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) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value		3,854
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative asset | 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, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		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) | Derivative liabilities | 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
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) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	4,399,934	4,882,395
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	17,290	72,934
Significant Other Observable Inputs (Level 2) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	159,840	377,145
Significant Other Observable Inputs (Level 2) | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Fair Value		20,034
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	9,666	63,091
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	2,194
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	102,194	140,841
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	141,808	20,926
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	28,088
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	315,502	32,367
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring
Assets
Fair Value	440,892	396,744
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Fair Value	587,241	136,992
Significant Other Observable Inputs (Level 2) | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Fair Value	8,655	18,291
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value		0
Significant Other Observable Inputs (Level 2) | Derivative asset | Fair Value, Measurements, Recurring
Assets
Assets, fair value	34,071	54,023
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Recurring
Assets
Assets, fair value	12,159	5,509
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		55,683
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,557,624	3,616,432
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	34,573	98,164
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	17,290	17,251
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	65,780	200
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	7,865	3,902
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	65,617	0
Significant Unobservable Inputs (Level 3) | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Fair Value		0
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
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) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Fair Value	0
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations | 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) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value		0
Significant Unobservable Inputs (Level 3) | Derivative asset | Fair Value, Measurements, Recurring
Assets
Assets, fair value	163	200
Significant Unobservable Inputs (Level 3) | Loans held for sale | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		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) | Derivative liabilities | 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	$ 7,865	3,867
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		$ 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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