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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Aug. 22, 2016	Mar. 31, 2017	Jun. 30, 2017
Other Commitments [Line Items]
Commitments to make loans, period, maximum			30 days
Commitments to sell loans under residential mortgage division			$ 207.8
Alternative investments unfunded investment commitments			111.7
Affordable Housing Fund Investment
Other Commitments [Line Items]
Alternative investments unfunded investment commitments			18.4
Small Business Investment Companies
Other Commitments [Line Items]
Alternative investments unfunded investment commitments			11.8
Other Investments
Other Commitments [Line Items]
Alternative investments unfunded investment commitments			111.7
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights
Other Commitments [Line Items]
Maximum commitment		$ 100.0
Related party term of contract	15 years	15 years
Payments for naming rights		$ 10.0	10.0
Jumbo SFR mortgage loan sale commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division			103.5
TBAs commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division			198.0
Best efforts commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division			9.8
Interest rate lock commitments
Other Commitments [Line Items]
Commitments to sell loans under residential mortgage division			$ 24.4

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Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=75032840&loc=d3e61044-112788

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