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OTHER INVESTMENT SECURITIES - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Capital stock par value | $ 100 |  | $ 100 |  |  |
Book value of investment in FHLB stock | $ 39,700,000 |  | $ 39,700,000 |  |  | $ 40,900,000
Market-to-market losses | 6,898,000 | $ 6,963,000 | 23,271,000 | $ 22,118,000 |  |
Equity Securities without Readily Determinable Fair Value, Amount | 2,200,000 |  | 2,200,000 |  |  | $ 2,200,000
Equity Securities [Member] |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Market-to-market losses | 3,000 |  | 13,000 |  |  |
Other Debt Obligations [Member] |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Carrying value of other equity security |  |  |  |  | $ (400,000) |
Available for sale Securities [Member] |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Carrying value of other equity security |  |  |  |  | $ 400,000 |
Investment in Federal Home Loan Bank Stock [Member] |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |
Dividend income from FHLB stock | $ 700,000 | $ 500,000 | $ 2,000,000 | $ 1,500,000 |  |

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