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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Amortized cost (1)    
Available-for-sale    
Municipal bonds $ 2,972 $ 3,476
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 44,315 45,983
Collateralized mortgage obligations, U.S. Government Agencies 10,160 10,462
Collateralized mortgage obligations, Non-agency 1,714 2,271
SBA bonds 18,020 12,278
Corporate bonds 3,500 3,500
Total securities available-for-sale 80,681 77,970
CRA mutual funds 826 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock 4,146 3,813
Gross unrealized gains    
Available-for-sale    
Municipal bonds 6 11
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 65 152
Collateralized mortgage obligations, U.S. Government Agencies 10 2
Collateralized mortgage obligations, Non-agency 365 410
SBA bonds 9
Corporate bonds 58 59
Total securities available-for-sale 504 643
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Gross unrealized losses    
Available-for-sale    
Municipal bonds 1
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 643 267
Collateralized mortgage obligations, U.S. Government Agencies 288 87
Collateralized mortgage obligations, Non-agency 13 17
SBA bonds 256 20
Corporate bonds 79 9
Total securities available-for-sale 1,279 401
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
Municipal bonds 2,978 3,486
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 43,737 45,868
Collateralized mortgage obligations, U.S. Government Agencies 9,882 10,377
Collateralized mortgage obligations, Non-agency 2,066 2,664
SBA bonds 17,764 12,267
Corporate bonds 3,479 3,550
Total securities available-for-sale 79,906 78,212
CRA mutual funds 826 835
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 4,146 $ 3,813