INVESTMENTS (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Investments available-for-sale book value	$ 453.0	$ 233.2
Investments held-to-maturity book value		$ 194.3
Non Credit Portion Of Other Than Temporary Impairments Recognized In Other Comprehensive Income	0.1
Held-to-maturity Securities, Transferred Security, at Carrying Value	203.1
Held-to-maturity Securities, Transferred to Available-for-sale Securities, Unrealized Gain (Loss)	$ 4.6
Held-to-maturity Securities, Transferred Security, Circumstances for Decision to Transfer	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	$ 1.1
Trust Preferred Securities	1.0
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	106.2
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	$ 206.5

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)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563

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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.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563

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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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