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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 35 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Affordable Housing Fund Investment            
Other Commitments [Line Items]            
Alternative investments unfunded investment commitments $ 11,100   $ 11,100   $ 11,100  
Small Business Investment Companies            
Other Commitments [Line Items]            
Alternative investments unfunded investment commitments 7,600   7,600   7,600  
Other Investments            
Other Commitments [Line Items]            
Alternative investments unfunded investment commitments 501   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 3,300 $ 3,300    
Payments for naming rights         18,000  
Prepaid commitment balance, net of amortization $ 8,000   $ 8,000   $ 8,000