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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, 2018	Dec. 31, 2017
Liabilities
Specific reserves related to impaired loans	$ 1,381	$ 1,451
Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	3,109,028	2,276,417
Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	12,956	15,351
Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	3,056
Derivative assets | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	16,247	9,752
Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	1,043	1,886
Mortgage Warehouse | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	1,930,738	1,793,408
Derivative liabilities | Fair Value, Measurements, Recurring [Member]
Liabilities
Financial Liabilities Fair Value Disclosure	13,698	10,074
Impaired loans, net of specific reserves
Liabilities
Specific reserves related to impaired loans	1,381	1,451
Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	11,929	13,902
Other real estate owned | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	1,027	1,449
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	476,563	183,458
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	320,373	238,472
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	361,008	46,089
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure		3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	3,056	3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	3,056
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage Warehouse | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities | Fair Value, Measurements, Recurring [Member]
Liabilities
Financial Liabilities Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	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 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure		3,352
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	3,105,839	2,273,005
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0
Significant Other Observable Inputs (Level 2) | Derivative assets | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	16,114	9,692
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	1,043	1,886
Significant Other Observable Inputs (Level 2) | Mortgage Warehouse | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	1,930,738	1,793,408
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring [Member]
Liabilities
Financial Liabilities Fair Value Disclosure	13,698	10,074
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	476,563	183,458
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	320,373	238,472
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	361,008	46,089
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	133	60
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	12,956	15,351
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Derivative assets | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	133	60
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Mortgage Warehouse | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Derivative liabilities | Fair Value, Measurements, Recurring [Member]
Liabilities
Financial Liabilities Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	11,929	13,902
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring [Member]
Assets
Assets, Fair Value Disclosure	1,027	1,449
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure	$ 0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member]
Assets
Assets, Fair Value Disclosure		$ 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
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Amount of allowance for credit losses related to recorded investment.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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