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RETIREMENT AND POSTRETIREMENT PLANS (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Participants
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Retirement Plans [Member] | BMP, Employee and Outside Director Retirement Plans [Member]      
Net Periodic Benefit Cost [Abstract]      
Service cost $ 0 $ 0  
Interest cost 292 329  
Expected return on assets (430) (395)  
Unrecognized past service liability 0 0  
Amortization of unrealized loss (gain) 289 359  
Net periodic cost 151 293  
Retirement Plans [Member] | Employee Retirement Plan [Member]      
Net Periodic Benefit Cost [Abstract]      
Estimated employer contributions or benefit payments     $ 17
Contributions by employer 4    
Retirement Plans [Member] | Outside Director Retirement Plan [Member]      
Net Periodic Benefit Cost [Abstract]      
Estimated employer contributions or benefit payments     226
Contributions by employer 56    
Retirement Plans [Member] | BMP Retirement Plan [Member]      
Net Periodic Benefit Cost [Abstract]      
Estimated employer contributions or benefit payments     564
Contributions by employer 137    
Lump-sum distribution for retired participant $ 1,199    
Number of retired participants that elected gross lump-sum distribution | Participants 1    
Distribution of common stock (in shares) | shares 22,051    
Component held by ESOP $ 942    
Benefit held by defined contribution plan 257    
Tax benefit from market valuation adjustment on distribution of ESOP shares 285    
Other Postretirement Plan [Member] | Postretirement Plan [Member]      
Net Periodic Benefit Cost [Abstract]      
Service cost 0 0  
Interest cost 14 14  
Expected return on assets 0 0  
Unrecognized past service liability (2) (2)  
Amortization of unrealized loss (gain) 0 (1)  
Net periodic cost 12 $ 11  
Estimated employer contributions or benefit payments     $ 121
Contributions by employer $ 17