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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, 2018	Dec. 31, 2017
Liabilities
Specific reserves related to impaired loans	$ 1,771	$ 1,451
Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	2,209,174	2,420,782
Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	8,373	15,351
Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,819
Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	22,613	9,752
Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,383	146,251
Loans receivable, mortgage warehouse - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,516,327	1,793,408
Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	15,684	10,074
Impaired loans, net of specific reserves
Liabilities
Specific reserves related to impaired loans	1,771	1,451
Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	7,295	13,902
Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	1,078	1,449
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	305,418	183,458
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		238,472
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	361,614	46,089
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,819	3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,819
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets | Fair Value, Measurements, Recurring
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
Assets
Assets, Fair Value Disclosure	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 Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities | Fair Value, Measurements, Recurring
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
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
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
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
Assets
Assets, Fair Value Disclosure		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 Disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		3,352
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	2,207,233	2,273,005
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Other Observable Inputs (Level 2) | Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	22,491	9,692
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,383	1,886
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	1,516,327	1,793,408
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	15,684	10,074
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring
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
Assets
Assets, Fair Value Disclosure	305,418	183,458
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		238,472
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	361,614	46,089
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure		0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	122	144,425
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	8,373	15,351
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0
Significant Unobservable Inputs (Level 3) | Derivative assets | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	122	60
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	144,365
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse - fair value option | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Derivative liabilities | Fair Value, Measurements, Recurring
Liabilities
Financial Liabilities Fair Value Disclosure	0	0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	7,295	13,902
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring
Assets
Assets, Fair Value Disclosure	1,078	1,449
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring
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
Assets
Assets, Fair Value Disclosure		0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring
Assets
Assets, Fair Value Disclosure	$ 0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring
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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