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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 36 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2017
Mar. 31, 2020
Affordable Housing Fund Investment        
Other Commitments [Line Items]        
Alternative investments unfunded investment commitments $ 17,800     $ 17,800
Small Business Investment Companies        
Other Commitments [Line Items]        
Alternative investments unfunded investment commitments 7,600     7,600
Other Investments        
Other Commitments [Line Items]        
Alternative investments unfunded investment commitments 501     501
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights        
Other Commitments [Line Items]        
Maximum commitment     $ 100,000  
Related party term of contract     15 years  
Advertising and promotion expense 1,700 $ 1,700    
Payments for naming rights       22,100
Prepaid commitment balance, net of amortization $ 7,100     $ 7,100