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RETIREMENT AND POSTRETIREMENT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Retirement Plans [Member] | BMP, Employee and Outside Director Retirement Plans [Member]        
Net Periodic Benefit Cost [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 313 291 937 874
Expected return on assets (382) (430) (1,146) (1,290)
Unrecognized past service liability 0 0 0 0
Amortization of unrealized loss (gain) 243 289 728 866
Net periodic cost 174 150 519 450
Retirement Plans [Member] | Employee Retirement Plans [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 32   32  
Actual contributions/benefit payments 8   24  
Retirement Plans [Member] | Outside Director Retirement Plans [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 225   225  
Actual contributions/benefit payments 56   168  
Retirement Plans [Member] | Postretirement Plan [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 109   109  
Actual contributions/benefit payments 57   136  
Retirement Plans [Member] | BMP Retirement Plan [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 564   564  
Actual contributions/benefit payments 137   411  
Distributions to Retired Participants [Abstract]        
Cash 24 1,221 24 2,477
Market value of Common Stock from Employee Stock Ownership Plan of BMP 13 964 13 1,963
Gross lump-sum distribution 37 2,185 37 4,440
Non-cash tax benefit $ 0 $ 315 $ 0 $ 608
Distribution of common stock (in shares) 685 49,440 685 102,074
Other Postretirement Plan [Member] | Postretirement Plan [Member]        
Net Periodic Benefit Cost [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 13 14 40 40
Expected return on assets 0 0 0 0
Unrecognized past service liability (2) (2) (6) (6)
Amortization of unrealized loss (gain) (3) 0 (9) 0
Net periodic cost $ 8 $ 12 $ 25 $ 34