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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | $ 2,547,000 | $ 1,851,000
Variable Rate | 306,499,000 | 335,654,000
Commitments to extend credit | Banc Home Loan | Discontinued Operations |  |
Other Commitments [Line Items] |  |
Commitments to extend credit | 0 | 0
Unused lines of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 1,662,000 | 19,085,000
Variable Rate | 1,178,559,000 | 1,309,170,000
Letters of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 1,046,000 | 1,050,000
Variable Rate | $ 9,321,000 | $ 12,976,000

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 + Details
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