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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Maximum exposure under reimbursement obligation $ 28,000    
Operating Leases, Future Minimum Payments Due [Abstract]      
2019 6,960    
2020 6,869    
2021 6,789    
2022 6,490    
2023 5,516    
Thereafter 23,853    
Total 56,477    
Rental expense $ 6,873 $ 6,740 $ 5,854
Maximum [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Percentage of contractual principal and interest payments on defaulted loans 10.00%    
Available Lines of Credit [Member] | Fixed Rate [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contractual amount of financial instruments with off-balance sheet risk $ 0 0  
Available Lines of Credit [Member] | Variable Rate [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contractual amount of financial instruments with off-balance sheet risk 102,110 73,315  
Other Loan Commitments [Member] | Fixed Rate [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contractual amount of financial instruments with off-balance sheet risk 16,450 1,000  
Other Loan Commitments [Member] | Variable Rate [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contractual amount of financial instruments with off-balance sheet risk 133,608 47,181  
Stand-by Letters of Credit [Member] | Fixed Rate [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contractual amount of financial instruments with off-balance sheet risk 1,968 927  
Stand-by Letters of Credit [Member] | Variable Rate [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Contractual amount of financial instruments with off-balance sheet risk 0 0  
Unused Lines of Credit Multifamily Residential and Commercial Real Estate Loans [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Unused Line of Credit with FHLBNY 1,020,213    
Loan Origination Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Liability amount $ 150,058 $ 48,181  
Loan commitment expiration period 3 months