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EQUITY SECURITIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Summary of Investment Holdings [Line Items] |  |  |  |  |
Capital stock par value | $ 100 |  | $ 100 |  |
Book value of investment in FHLB stock | $ 41,700 |  | $ 41,700 |  | $ 41,900
Market-to-market gains (losses) | 9,916 | $ 8,513 | 18,866 | $ 16,373 |
Equity Securities [Member] |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Equity Securities, FV-NI | 400 |  | 400 |  |
Market-to-market gains (losses) | 6 | (3) | 11 | (10) |
Equity Securities without Readily Determinable Fair Value, Amount | 2,100 |  | 2,100 |  | $ 2,200
Investment in Federal Home Loan Bank Stock [Member] |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Dividend income from FHLB stock | $ 700 | $ 700 | $ 1,400 | $ 1,300 |

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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