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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Maximum exposure under reimbursement obligation $ 28,000    
Operating Leases, Future Minimum Payments Due [Abstract]      
2018 6,682    
2019 6,808    
2020 6,715    
2021 6,634    
2022 6,331    
Thereafter 28,438    
Total 61,608    
Rental expense $ 6,740 $ 5,854 $ 3,685
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 73,315 34,774  
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 1,000 0  
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 47,181 138,310  
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 927 0  
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 1,771,000    
Loan Origination Commitments [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Liability amount $ 48,181 $ 115,216  
Loan commitment expiration period 3 months