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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amortized cost basis (1)    
Available-for-sale    
U.S. Government Agency notes $ 4,520 $ 7,590
Municipal bonds 26,562 5,334
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 28,961 57,837
Collateralized mortgage obligations, U.S. Government Agencies 25,041 17,835
Corporate bonds 5,000 3,500
Total securities available-for-sale 90,084 92,096
Non-marketable securities    
Federal Home Loan Bank of Boston stock 3,242 4,496
Gross unrealized gains    
Available-for-sale    
U.S. Government Agency notes 125 83
Municipal bonds 704 45
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 420 170
Collateralized mortgage obligations, U.S. Government Agencies 468 85
Corporate bonds 108 76
Total securities available-for-sale 1,825 459
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Gross unrealized losses    
Available-for-sale    
U.S. Government Agency notes 1 3
Municipal bonds 73
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 24 561
Collateralized mortgage obligations, U.S. Government Agencies 10 173
Corporate bonds
Total securities available-for-sale 108 737
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 4,644 7,670
Municipal bonds 27,193 5,379
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 29,357 57,446
Collateralized mortgage obligations, U.S. Government Agencies 25,499 17,747
Corporate bonds 5,108 3,576
Total securities available-for-sale 91,801 91,818
CRA mutual funds 882 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 3,242 $ 4,496