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COMMITMENTS AND CONTINGENCIES AND OTHER MATTERS (Detail Textuals) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies [Line Items]      
Rental expenses under leases $ 7,300 $ 6,800 $ 5,300
Federal funds purchased 50,000 $ 100,000  
BNB Bank      
Commitments and Contingencies [Line Items]      
Required cash balance with Federal Reserve Bank of New York 3,900    
Average balance maintained 22,400    
Lines of credit with unaffiliated correspondent banks to provide short-term credit 369,500    
Amount available for transactions under Master Repurchase Agreement 1,300,000    
BNB Bank | Federal Home Loan Bank Advances      
Commitments and Contingencies [Line Items]      
Lines of credit available on an unsecured basis 349,500    
Federal funds purchased $ 50,000