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FAIR VALUE - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value Inputs Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 17,829 | $ 19,771 | $ 19,855 | $ 22,914
Total gains or (losses) (realized/unrealized): |  |  |  |
Included in other comprehensive income | 35 | 1,754 | 228 | 2,500
Purchases | 500 | 0 | 500 | 0
Principal repayments and amortization | (495) | (1,186) | (2,714) | (5,075)
Ending balance | $ 17,869 | $ 20,339 | $ 17,869 | $ 20,339

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