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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total gains or losses (realized/unrealized):        
Decrease in GNMA loans subject to a repurchase option     $ 66,000,000.0  
Disposals | Banc home loans | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities        
Total gains or losses (realized/unrealized):        
Loans held-for-sale, carried at fair value       $ 32,300,000
Significant Unobservable Inputs (Level 3) | Recurring | Mortgage Servicing Rights        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 1,157,000 $ 1,770,000 31,852,000  
Total gains or losses (realized/unrealized):        
Included in earnings-fair value adjustment (308,000) (264,000) (1,155,000)  
Sales and settlements (283,000) (349,000) (28,927,000)  
Ending Balance 566,000 1,157,000 1,770,000  
Significant Unobservable Inputs (Level 3) | Recurring | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 19,233,000 25,040,000 98,940,000  
Total gains or losses (realized/unrealized):        
Included in earnings-fair value adjustment (1,347,000) (16,000) (1,378,000)  
Additions 0 406,000 23,678,000  
Sales and settlements (16,941,000) (6,197,000) (96,200,000)  
Ending Balance 945,000 19,233,000 25,040,000  
Significant Unobservable Inputs (Level 3) | Recurring | Disposals | Banc home loans | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities        
Total gains or losses (realized/unrealized):        
Loans held-for-sale, carried at fair value $ 0 $ 0 $ 17,300,000