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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
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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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