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RESERVE FOR LOSS ON REPURCHASED LOANS - Summary of Activities in Reserve for Loss Reimbursements on Sold Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingency Accrual [Roll Forward] |  |  |
Subsequent change in the reserve | $ (1,812) | $ (3,352) | $ 2,326
Representations and Warranties Obligations and Corporate Guarantees |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of year | 7,974 | 9,700 | 8,303
Initial provision for loan repurchases | 1,622 | 3,942 | 2,026
Utilization of reserve for loan repurchases | (2,238) | (2,316) | (3,801)
Other adjustments | 760 | 0 | 846
Balance at end of year | $ 6,306 | $ 7,974 | $ 9,700

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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