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STOCKHOLDERS' EQUITY - Warrants (Details) - $ / shares	Jun. 30, 2018	Jun. 29, 2018	Jun. 06, 2018	Mar. 31, 2018	Mar. 30, 2018	Dec. 31, 2017	Dec. 27, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 17, 2016	Mar. 09, 2016	Dec. 08, 2015	Aug. 22, 2012	Dec. 31, 2019	Aug. 17, 2016	Aug. 16, 2016	Aug. 03, 2011	Nov. 01, 2010
Class of Stock [Line Items]
Exercise price of warrants for non-voting common stock (in dollars per share)																					$ 11.00
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	$ 11.00		$ 11.00
President And Chief Executive Officer | Cor Advisors Llc
Class of Stock [Line Items]
Warrants issued (in shares)																960,000			480,000	960,000
Number of 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 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
Number of warrants exercised (in shares)						130,000	130,000
Issuance of shares of common stock (in shares)						77,413
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
Number of warrants exercised (in shares)				130,000	130,000
Issuance of shares of common stock (in shares)				72,159
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
Number of warrants exercised (in shares)	130,000	130,000
Issuance of shares of common stock (in shares)	73,543
President And Chief Executive Officer | Cor Advisors Llc | Tranche One
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)																	0			435,000
Number of warrants exercised (in shares)												80,000	130,000	130,000	95,000
Issuance of shares of common stock (in shares)												40,081	70,775	53,711	37,355
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 Four
Class of Stock [Line Items]
Warrants issued (in shares)																80,000
Tcw Shared Opportunity Fund
Class of Stock [Line Items]
Warrant exercisable period																5 years
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)						$ 8.72		$ 8.55	$ 8.61	$ 8.66		$ 8.80
Number of warrants exercised (in shares)								40,000	130,000	130,000	130,000	50,000
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 A Common Stock | Cor Advisors Llc
Class of Stock [Line Items]
Issuance of stock shares (in shares)			176,488
Brother of President and Chief Executive Officer | Class B Common Stock | Cor Advisors Llc
Class of Stock [Line Items]
Shares canceled (shares)			176,488
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 common stock (in shares)											64,962	25,051
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 common stock (in shares)								23,237	77,376	75,875

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