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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Amortized cost basis (1)    
Available-for-sale    
U.S. Government Agency notes $ 4,771 $ 7,590
Municipal bonds 20,205 5,334
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 39,158 57,837
Collateralized mortgage obligations, U.S. Government Agencies 29,925 17,835
Corporate bonds 4,250 3,500
Total securities available-for-sale 98,309 92,096
CRA mutual funds 869 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock 2,839 4,496
Gross unrealized gains    
Available-for-sale    
U.S. Government Agency notes 163 83
Municipal bonds 430 45
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 585 170
Collateralized mortgage obligations, U.S. Government Agencies 606 85
Corporate bonds 91 76
Total securities available-for-sale 1,875 459
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Gross unrealized losses    
Available-for-sale    
U.S. Government Agency notes 2 3
Municipal bonds 12
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 20 561
Collateralized mortgage obligations, U.S. Government Agencies 1 173
Corporate bonds
Total securities available-for-sale 35 737
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 4,932 7,670
Municipal bonds 20,623 5,379
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 39,723 57,446
Collateralized mortgage obligations, U.S. Government Agencies 30,530 17,747
Corporate bonds 4,341 3,576
Total securities available-for-sale 100,149 91,818
CRA mutual funds 869 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 2,839 $ 4,496