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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	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Measurements, Recurring
Assets
Assets, fair value	$ 4,426,439	$ 4,886,449
Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	33,282	76,836
Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value		3,854
Derivative asset | Fair Value, Measurements, Recurring
Assets
Assets, fair value	38,289	54,223
Loans held for sale | Fair Value, Measurements, Recurring
Assets
Assets, fair value	6,074	5,509
Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	27,959	55,683
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,855,284	3,616,432
Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	38,756	98,164
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	5,323	21,118
Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		35
Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	322,954	377,145
Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	20,114	20,034
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	10,355	63,091
Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,205
Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	81,758	140,841
Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	142,841	20,926
Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	23,087
Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	162,927	32,367
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, fair value	350,421	396,744
Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	401,576	136,992
Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	8,554	18,291
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) | 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	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
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	4,426,138	4,882,395
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	27,959	72,934
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	37,988	54,023
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Recurring
Assets
Assets, fair value	6,074	5,509
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	27,959	55,683
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,855,284	3,616,432
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial liabilities, fair value	38,756	98,164
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	0	17,251
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	322,954	377,145
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	20,114	20,034
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	10,355	63,091
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	2,205
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	81,758	140,841
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	142,841	20,926
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	23,087
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	162,927	32,367
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, fair value	350,421	396,744
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	401,576	136,992
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	8,554	18,291
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Assets, fair value	301	200
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value	5,323	3,902
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	301	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	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	5,323	3,867
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, fair value		35
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring
Assets
Assets, fair value	$ 0	$ 0

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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