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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amortized cost (1)    
Available-for-sale    
U.S. Government Agency notes $ 2,497  
Municipal bonds 2,524 $ 3,476
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 35,768 45,983
Collateralized mortgage obligations, U.S. Government Agencies 13,803 10,462
Collateralized mortgage obligations, Non-agency 1,556 2,271
SBA bonds 26,480 12,278
Corporate bonds 3,500 3,500
Total securities available-for-sale 86,128 77,970
CRA mutual funds 825 835
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 7  
Municipal bonds 5 11
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 24 152
Collateralized mortgage obligations, U.S. Government Agencies 6 2
Collateralized mortgage obligations, Non-agency 371 410
SBA bonds 32 9
Corporate bonds 30 59
Total securities available-for-sale 475 643
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Gross unrealized losses    
Available-for-sale    
U.S. Government Agency notes  
Municipal bonds 1
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 628 267
Collateralized mortgage obligations, U.S. Government Agencies 313 87
Collateralized mortgage obligations, Non-agency 17 17
SBA bonds 515 20
Corporate bonds 73 9
Total securities available-for-sale 1,546 401
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 2,504  
Municipal bonds 2,529 3,486
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 35,164 45,868
Collateralized mortgage obligations, U.S. Government Agencies 13,496 10,377
Collateralized mortgage obligations, Non-agency 1,910 2,664
SBA bonds 25,997 12,267
Corporate bonds 3,457 3,550
Total securities available-for-sale 85,057 78,212
CRA mutual funds 825 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 4,988 $ 3,813