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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
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