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SALES OF BRANCH, SUBSIDIARY AND BUSINESS UNITS - Banc Home Loans Sale Additional Information (Details) - USD ($)
 12 Months Ended 45 Months Ended
Mar. 30, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net gain on disposal   $ 0 $ 0 $ 1,439,000  
Banc home loans | Disposals          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash premium payment $ 25,000,000.0        
Book value of certain assets sold $ 2,500,000        
Performance period following completion of transaction 38 months        
Net gain on disposal   0 0 $ 1,439,000 $ 15,235,000
Assets of discontinued operations   0 0   0
Liabilities of discontinued operations   $ 0 $ 0   $ 0