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FAIR VALUE - Narrative (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of investment | $ 465,844,000 | $ 415,308,000 |
Purchase of investment | 226,014,000 | 203,719,000 | $ 108,448,000
Specific charges to value the real estate owned | 0 | 0 |
Change in fair value of foreclosed real estate | 0 | 0 | 43,000
Impaired loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Changes in fair value of impaired loans and foreclosed real estate | 146,000 | 867,000 | $ 268,000
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value liabilities |  | 0 |
Fair value of investment | 465,844,000 | 415,308,000 |
Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Allowance for loan losses or partial charge-offs | 928,000 | 2,266,000 |
Private label commercial CMOs |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of investment | 7,209,000 |  |
Purchase of investment | 7,213,000 |  |
Premium amortization | 41,000 |  |
Unrealized gain | 37,000 |  |
Private label commercial CMOs | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of investment | $ 75,045,000 | $ 7,653,000 |

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