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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 31, 2017	Aug. 22, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Commitments to make loans period, maximum			30 days
Unfunded commitments			$ 50.1
Affordable Housing Fund Investment
Other Commitments [Line Items]
Unfunded commitments			$ 15.6	$ 11.0	$ 50.6
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

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Alternative Investments, Unfunded Investment Commitments

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Other Commitments, Origination of Loans, Period

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Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

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