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FAIR VALUES OF FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available-for-sale $ 1,231,431,000 $ 912,580,000  
Valuation allowance expense for OREO assets 0 145,000 $ 53,000
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available-for-sale 0 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available-for-sale 0 0  
Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available-for-sale 0 0  
Significant Unobservable Inputs (Level 3) | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available-for-sale 0 0  
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Aggregated unpaid principal balances $ 1,100,000 $ 19,800,000  
Insured Servicing Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate (percent) 1.55% 1.55%  
Uninsured Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Expected loss rate (percent) 20.00% 20.00%