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SUMMARY OF ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses $ 98,200   $ 41,461 $ 36,463 $ 28,441
Retained earnings $ 574,297   600,641    
Acquisition, Development, And Construction Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Value ratio 50.00%        
Small Business Administration ("SBA") Paycheck Protection Program ("PPP")          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Value ratio 100.00%        
Cumulative Effect, Period of Adoption, Adjustment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses     $ (3,919)    
Maximum [Member] | One-to-four family residential and cooperative/condominium apartment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Value ratio 75.00%        
Maximum [Member] | Multifamily residential and residential mixed-use          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Value ratio 75.00%        
Maximum [Member] | Commercial real estate ("CRE")          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Value ratio 75.00%        
Minimum [Member] | One-to-four family residential and cooperative/condominium apartment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt service ratio 1.25%        
Minimum [Member] | Multifamily residential and residential mixed-use          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt service ratio 1.20%        
Minimum [Member] | Commercial real estate ("CRE")          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt service ratio 1.25%        
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses $ (3,900)        
Reserve for unfunded commitments $ 1,400        
Retained earnings   $ 1,700