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LOAN PORTFOLIO - Loans Held for Investment on Which Accrual of Interest Income had been Discontinued (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 33,630		$ 43,186
Loans and Leases Receivable, Gross	9,113,955		8,858,123	$ 8,640,291
Entity Loan Modification Program [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Modifications Recorded Investment Accrual Status	482,046		478,928
PCI loans
Accounts Notes And Loans Receivable [Line Items]
Loans and Leases Receivable, Gross	141,706	$ 144,443	146,640	$ 152,242	$ 155,281	$ 158,174
Nonperforming Financing Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale	$ 7,100		$ 16,100

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings and are on accrual status as of the balance sheet date.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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X

- Definition

Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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