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STOCKHOLDERS' EQUITY - Warrants (Details) - $ / shares															1 Months Ended	9 Months Ended
	Jun. 30, 2018	Jun. 06, 2018	Mar. 31, 2018	Mar. 30, 2018	Dec. 27, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 17, 2016	Mar. 09, 2016	Dec. 08, 2015	Aug. 03, 2015	Nov. 01, 2010	Dec. 31, 2016	Sep. 30, 2018	Aug. 17, 2016
Class of Stock [Line Items]
Exercise price of warrants for non-voting common stock (in dollars per share)														$ 11
Cor Advisors Llc
Class of Stock [Line Items]
Warrants issued (in shares)														1,395,000
Exercise price of warrants for non-voting common stock (in dollars per share)														$ 11.00
Common Stock | Class B Common Stock
Class of Stock [Line Items]
Issuance of shares of voting common stock (in shares)													70,690
Common Stock | Class A Common Stock
Class of Stock [Line Items]
Issuance of shares of voting common stock (in shares)													70,690			6,134,988
TCW Shared Opportunity Fund
Class of Stock [Line Items]
Warrants issued (in shares)														240,000
Exercise price of warrants for non-voting common stock (in dollars per share)													$ 9.13	$ 11.00
Warrant exercisable period														5 years
President And Chief Executive Officer | Cor Advisors Llc
Class of Stock [Line Items]
Warrants issued (in shares)														960,000			480,000
Warrants exercised (in shares)						90,000
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on September 30, 2017
Class of Stock [Line Items]
Warrants issued (in shares)																	90,000
Issuance of shares of voting common stock (in shares)						52,284
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on December 31, 2017
Class of Stock [Line Items]
Warrants issued (in shares)																	130,000
Exercise price of warrants for non-voting common stock (in dollars per share)					$ 8.49
Issuance of shares of voting common stock (in shares)					77,413
Warrants exercised (in shares)					130,000
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on March 31, 2018
Class of Stock [Line Items]
Warrants issued (in shares)																	130,000
Exercise price of warrants for non-voting common stock (in dollars per share)																$ 8.44
Issuance of shares of voting common stock (in shares)			72,159
Warrants exercised (in shares)				130,000
President And Chief Executive Officer | Cor Advisors Llc | Exercisable on June 30, 2018
Class of Stock [Line Items]
Warrants issued (in shares)																	130,000
Exercise price of warrants for non-voting common stock (in dollars per share)																$ 8.38
Issuance of shares of voting common stock (in shares)	73,543
Warrants exercised (in shares)	130,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche One
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Two
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Three
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Four
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Five
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Six
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Seven
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
President And Chief Executive Officer | Cor Advisors Llc | Tranche Eight
Class of Stock [Line Items]
Warrants issued (in shares)														50,000
Vice President and Chief Lending Officer
Class of Stock [Line Items]
Exercise price of warrants for non-voting common stock (in dollars per share)									$ 8.80	$ 8.84	$ 8.90	$ 9.04
Vice President and Chief Lending Officer | Cor Advisors Llc
Class of Stock [Line Items]
Warrants issued (in shares)														435,000		0
Issuance of shares of voting common stock (in shares)									40,081	70,775	53,711	37,355
Warrants exercised (in shares)									80,000	130,000	130,000	95,000
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche One
Class of Stock [Line Items]
Warrants issued (in shares)														95,000
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche Two
Class of Stock [Line Items]
Warrants issued (in shares)														130,000
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche Three
Class of Stock [Line Items]
Warrants issued (in shares)														130,000
Vice President and Chief Lending Officer | Cor Advisors Llc | Tranche Four
Class of Stock [Line Items]
Warrants issued (in shares)														80,000
Brother of President and Chief Executive Officer | Cor Advisors Llc
Class of Stock [Line Items]
Warrants issued (in shares)																	480,000
Exercise price of warrants for non-voting common stock (in dollars per share)						$ 8.55	$ 8.61	$ 8.66	$ 8.80						$ 8.72
Warrants exercised (in shares)						40,000	130,000	130,000	50,000						130,000
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on September 30, 2016
Class of Stock [Line Items]
Warrants issued (in shares)																	50,000
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on December 31, 2016
Class of Stock [Line Items]
Warrants issued (in shares)																	130,000
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on March 31, 2017
Class of Stock [Line Items]
Warrants issued (in shares)																	130,000
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on June 30, 2017
Class of Stock [Line Items]
Warrants issued (in shares)																	130,000
Brother of President and Chief Executive Officer | Cor Advisors Llc | Exercisable on September 30, 2017
Class of Stock [Line Items]
Warrants issued (in shares)																	40,000
Brother of President and Chief Executive Officer | Class B Common Stock | Cor Advisors Llc
Class of Stock [Line Items]
Number of shares canceled (in shares)		176,488.000
Brother of President and Chief Executive Officer | Class A Common Stock | Cor Advisors Llc
Class of Stock [Line Items]
Common stock, shares issued (in shares)		176,488.000
Brother of President and Chief Executive Officer | Common Stock | Class B Common Stock | Cor Advisors Llc
Class of Stock [Line Items]
Issuance of shares of voting common stock (in shares)						23,237	77,376	75,875
Brother of President and Chief Executive Officer | Common Stock | Class A Common Stock | Cor Advisors Llc
Class of Stock [Line Items]
Issuance of shares of voting common stock (in shares)									25,051						64,962

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