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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Amortized cost (1)    
Available-for-sale    
U.S. Government Agency notes $ 4,991  
Municipal bonds 5,392 $ 3,476
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 34,845 45,983
Collateralized mortgage obligations, U.S. Government Agencies 18,255 10,462
Collateralized mortgage obligations, Non-agency 1,423 2,271
SBA bonds 28,607 12,278
Corporate bonds 3,500 3,500
Total securities available-for-sale 97,013 77,970
CRA mutual funds 823 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock 4,988 3,813
Gross unrealized gains    
Available-for-sale    
U.S. Government Agency notes  
Municipal bonds 5 11
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 21 152
Collateralized mortgage obligations, U.S. Government Agencies 1 2
Collateralized mortgage obligations, Non-agency 395 410
SBA bonds 9
Corporate bonds 29 59
Total securities available-for-sale 451 643
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Gross unrealized losses    
Available-for-sale    
U.S. Government Agency notes 28  
Municipal bonds 7 1
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 467 267
Collateralized mortgage obligations, U.S. Government Agencies 404 87
Collateralized mortgage obligations, Non-agency 21 17
SBA bonds 757 20
Corporate bonds 9
Total securities available-for-sale 1,684 401
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 4,963  
Municipal bonds 5,390 3,486
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 34,399 45,868
Collateralized mortgage obligations, U.S. Government Agencies 17,852 10,377
Collateralized mortgage obligations, Non-agency 1,797 2,664
SBA bonds 27,850 12,267
Corporate bonds 3,529 3,550
Total securities available-for-sale 95,780 78,212
CRA mutual funds 823 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 4,988 $ 3,813