SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL DISCLOSURES (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Restrictions on Cash and Cash Equivalents
Required reserve balances by the Federal Reserve Bank	$ 0	$ 0
Cash reserve to cover insurable claims	$ 3,000,000	$ 2,000,000
Equity
Percentage of stock dividend in excess of which are reported by transferring the par value of the stock issued from retained earnings to common stock	20.00%
Minimum percentage of stock dividend which are reported by transferring the par value of the stock issued from retained earnings to common stock and additional paid in capital	20.00%

Represents the minimum percentage of stock dividend which are reported by transferring the par value of the stock issued from retained earnings to common stock and additional paid in capital, as of the ex- dividend date.

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

Represents the percentage of stock dividend in excess of which are reported by transferring the par value of the stock issued from retained earnings to common stock.

+ References

No definition available.

+ Details

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- Definition

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 305
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

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- References

No definition available.

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- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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