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ACQUISITIONS - Narrative (Details) - USD ($) | Jun. 01, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 32,019,000 | $ 18,742,000 |
Gross contractual balance of loans receivable |  | $ 1,593,474,000 | $ 1,359,544,000 | $ 1,296,843,000
Westbound |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of outstanding common shares acquired | 100.00% |  |  |
Consideration transferred | $ 35,991,000 |  |  |
Shares issued (in shares) | 899,816 |  |  |
Shares acquired (in shares) | 2,311,952 |  |  |
Acquisition-related costs | $ 737,000 |  |  |
Goodwill | 13,277,000 |  |  |
Goodwill expected to be deducted | 0 |  |  |
Contingent consideration related to escrow agreement | $ 1,750,000 |  |  |
Contingent consideration performance period | 3 years |  |  |
Fair value of performing loans | $ 154,687,000 |  |  |
Gross contractual balance of loans receivable | $ 154,687,000 |  |  |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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