INVESTMENTS (Additional Information) (Detail) - USD ($)	9 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Investment [Line Items]
Investments available-for-sale book value	$ 464,200,000	$ 233,200,000
Investments held-to-maturity book value	0	$ 194,300,000
Non Credit Portion Of Other Than Temporary Impairments Recognized In Other Comprehensive Income	100,000
Held-to-maturity Securities, Transferred Security, at Carrying Value	203,100,000
Held-to-maturity Securities, Transferred to Available-for-sale Securities, Unrealized Gain (Loss)	$ 4,600,000
Held-to-maturity Securities, Transferred Security, Circumstances for Decision to Transfer	The Company made this transfer to provide additional liquidity to fund future loan growth and other corporate activities.
Banks And Financial Institutions [Member]
Investment [Line Items]
Trust Preferred Securities Fair Value	$ 1,000,000
Trust Preferred Securities	1,100,000
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations [Member] \| Collateralized Mortgage Obligations [Member]
Investment [Line Items]
Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value	111,100,000
Government National Mortgage Association Certificates And Obligations Federal National Mortgage Association Certificates And Obligations And Federal Home Loan Mortgage Corporation Certificates And Obligations [Member] \| Mortgage Backed Securities [Member]
Investment [Line Items]
Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value	$ 180,400,000

Line items represent reporting 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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Non credit portion of other than temporary impairments recognized in other comprehensive income.

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Trust Preferred Securities

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Trust Preferred Securities Fair Value

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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For any transfers from securities categorized as held-to-maturity, describe the circumstances leading to the decision to transfer the security to another category of investments in debt and equity securities (trading or available-for-sale). Such transfers are generally not expected to occur, but may be justified in circumstances such as: (a) evidence of a significant deterioration in the issuer's creditworthiness; (b) a change in tax law that eliminates or reduces the tax-exempt status of interest on the debt security (but not a change in tax law that revises the marginal tax rates applicable to interest income); (c) a major business combination or major disposition (such as sale of a component of an entity) that necessitates the sale or transfer of held-to-maturity securities to maintain the enterprise's existing interest rate risk position or credit risk policy; (d) a change in statutory or regulatory requirements significantly modifying either what constitutes a permissible investment or the maximum level of investments in certain kinds of securities, thereby causing an enterprise to dispose of a held-to-maturity security; (e) a significant increase by the regulator in the industry's capital requirements that causes the enterprise to downsize by selling held-to-maturity securities; or (f) a significant increase in the risk weights of debt securities used for regulatory risk-based capital purposes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (d)
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This item represents the unrealized gain (loss) recognized in other comprehensive income (a separate component of shareholders' equity) as a result of securities categorized as held-to-maturity being transferred to the available-for-sale securities category.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563

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The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

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The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as held to maturity which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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