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TRUST PREFERRED SECURITIES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Subordinated debt transactions outstanding $ 16,496 $ 16,496
NPB Capital Trust 1    
Shares Issued 341  
Interest Rate 3.96%  
Description of Interest Rate [1]

3 Month LIBOR plus 2.60%

  
Maturity Date Jul. 07, 2034  
Subordinated debt transactions outstanding $ 11,341 11,341
NPB Capital Trust 2    
Shares Issued 155  
Interest Rate 3.13%  
Description of Interest Rate [1]

3 Month LIBOR plus 1.77%

  
Maturity Date Oct. 07, 2036  
Subordinated debt transactions outstanding $ 5,155 $ 5,155
[1] Interest rate on both NPB Capital Trust I and NPB Capital Trust 2 are a floating rate, which resets quarterly.