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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Amortized cost (1)    
Available-for-sale    
U.S. Government Agency notes $ 4,991  
Municipal bonds 5,334 $ 3,476
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 32,522 45,983
Collateralized mortgage obligations, U.S. Government Agencies 17,835 10,462
Collateralized mortgage obligations, Non-agency   2,271
SBA bonds 27,914 12,278
Corporate bonds 3,500 3,500
Total securities available-for-sale 92,096 77,970
CRA mutual funds 836 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock 4,496 3,813
Gross unrealized gains    
Available-for-sale    
U.S. Government Agency notes 58  
Municipal bonds 45 11
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 56 152
Collateralized mortgage obligations, U.S. Government Agencies 85 2
Collateralized mortgage obligations, Non-agency   410
SBA bonds 139 9
Corporate bonds 76 59
Total securities available-for-sale 459 643
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 251 267
Collateralized mortgage obligations, U.S. Government Agencies 173 87
Collateralized mortgage obligations, Non-agency   17
SBA bonds 313 20
Corporate bonds 9
Total securities available-for-sale 737 401
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 5,049  
Municipal bonds 5,379 3,486
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 32,327 45,868
Collateralized mortgage obligations, U.S. Government Agencies 17,747 10,377
Collateralized mortgage obligations, Non-agency   2,664
SBA bonds 27,740 12,267
Corporate bonds 3,576 3,550
Total securities available-for-sale 91,818 78,212
CRA mutual funds 836 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 4,496 $ 3,813