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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 22, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Other Commitments [Line Items] |  |  |  |  |
Commitments to make loans, period, maximum |  |  |  | 30 days |
Affordable Housing Fund Investment |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Alternative investments unfunded investment commitments |  |  |  | $ 14,000 |
Small Business Investment Companies |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Alternative investments unfunded investment commitments |  |  |  | 10,700 |
Other Investments |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Alternative investments unfunded investment commitments |  |  |  | 501 |
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Maximum commitment |  | $ 100,000 |  |  | $ 100,000
Related party term of contract | 15 years | 15 years |  |  |
Payments for naming rights |  |  | $ 10,000 | 12,700 |
Prepaid commitment balance, net of amortization |  |  |  | $ 9,300 |

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
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