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RETIREMENT AND POSTRETIREMENT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 312 291 625 583
Expected return on assets (382) (430) (764) (860)
Unrecognized past service liability 0 0 0 0
Amortization of unrealized loss (gain) 243 289 486 578
Net periodic cost 173 150 347 301
Retirement Plans [Member] | Employee Retirement Plans [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 32   32  
Actual contributions/benefit payments 16   16  
Retirement Plans [Member] | Outside Director Retirement Plans [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 225   225  
Actual contributions/benefit payments 56   112  
Retirement Plans [Member] | Postretirement Plan [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 109   109  
Actual contributions/benefit payments 35   79  
Retirement Plans [Member] | BMP Retirement Plan [Member]        
Retirement and Postretirement Plans [Abstract]        
Planned contributions/benefit payments 564   564  
Actual contributions/benefit payments 137   274  
Distributions to Retired Participants [Abstract]        
Cash 0 0 0 257
Market value of Common Stock from Employee Stock Ownership Plan of BMP 0 56 0 998
Gross lump-sum distribution 0 56 0 1,255
Non-cash tax benefit 0 $ 8 0 $ 293
Distribution of common stock (in shares)   3,038   52,634
Other Postretirement Plan [Member] | Postretirement Plan [Member]        
Net Periodic Benefit Cost [Abstract]        
Service cost 0 $ 0 0 $ 0
Interest cost 13 13 27 27
Expected return on assets 0 0 0 0
Unrecognized past service liability (2) (2) (4) (4)
Amortization of unrealized loss (gain) (3) 0 (6) 0
Net periodic cost $ 8 $ 11 $ 17 $ 23