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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 Non-recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	$ 2,276,417	$ 2,621,848
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	15,351	9,258
Impaired loans reserve	1,451	1,360
Derivatives
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	9,752	10,864
Liabilities, recurring fair value measurements	10,074	14,172
Loans held for sale – fair value option
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	1,795,294	2,117,510
Impaired loans, net of reserves
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	13,902	6,527
Impaired loans reserve	1,451	2,273
Other real estate owned
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	1,449	2,731
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	183,458	231,263
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	238,472	201,817
Available-for-sale Securities | Corporate notes
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	46,089	45,148
Available-for-sale Securities | Equity securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	3,352	15,246
Quoted Prices in Active Markets for Identical Assets (Level 1)
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	3,352	15,246
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Liabilities, recurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of reserves
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	3,352	15,246
Significant Other Observable Inputs (Level 2)
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	2,273,005	2,606,557
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	0	0
Significant Other Observable Inputs (Level 2) | Derivatives
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	9,692	10,819
Liabilities, recurring fair value measurements	10,074	14,172
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	1,795,294	2,117,510
Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	0	0
Significant Other Observable Inputs (Level 2) | Other real estate owned
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	0	0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	183,458	231,263
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	238,472	201,817
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	46,089	45,148
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3)
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	60	45
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	15,351	9,258
Significant Unobservable Inputs (Level 3) | Derivatives
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	60	45
Liabilities, recurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	13,902	6,527
Significant Unobservable Inputs (Level 3) | Other real estate owned
Measured at Fair Value on a Nonrecurring Basis:
Assets, nonrecurring fair value measurements	1,449	2,731
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities
Measured at Fair Value on a Recurring Basis:
Assets, recurring fair value measurements	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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