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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Aug. 22, 2016
Mar. 31, 2017
Sep. 30, 2017
Other Commitments [Line Items]      
Commitments to make loans, period, maximum     30 days
Commitments to sell loans under residential mortgage division     $ 0
Alternative investments unfunded investment commitments     96,700,000
Accrued litigation liability     5,900,000
Affordable Housing Fund Investment      
Other Commitments [Line Items]      
Alternative investments unfunded investment commitments     16,200,000
Small Business Investment Companies      
Other Commitments [Line Items]      
Alternative investments unfunded investment commitments     10,900,000
Other Investments      
Other Commitments [Line Items]      
Alternative investments unfunded investment commitments     97,200,000
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights      
Other Commitments [Line Items]      
Maximum commitment   $ 100,000,000  
Related party term of contract 15 years 15 years  
Payments for naming rights   $ 10,000,000 10,000,000
SFR mortgage loan sale commitments      
Other Commitments [Line Items]      
Commitments to sell loans under residential mortgage division     $ 15,100,000