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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amortized cost basis (1)    
Available-for-sale    
U.S. Government Agency notes $ 4,642 $ 7,590
Municipal bonds 26,604 5,334
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 30,534 57,837
Collateralized mortgage obligations, U.S. Government Agencies 26,621 17,835
Corporate bonds 4,250 3,500
Total securities available-for-sale 92,651 92,096
CRA mutual funds 881 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock 2,575 4,496
Gross unrealized gains    
Available-for-sale    
U.S. Government Agency notes 165 83
Municipal bonds 746 45
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 624 170
Collateralized mortgage obligations, U.S. Government Agencies 626 85
Corporate bonds 87 76
Total securities available-for-sale 2,248 459
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Gross unrealized losses    
Available-for-sale    
U.S. Government Agency notes 3 3
Municipal bonds 45
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 37 561
Collateralized mortgage obligations, U.S. Government Agencies 173
Corporate bonds
Total securities available-for-sale 85 737
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 4,804 7,670
Municipal bonds 27,305 5,379
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 31,121 57,446
Collateralized mortgage obligations, U.S. Government Agencies 27,247 17,747
Corporate bonds 4,337 3,576
Total securities available-for-sale 94,814 91,818
CRA mutual funds 881 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 2,575 $ 4,496