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SECURITIES - Composition of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Amortized cost basis (1)    
Available-for-sale    
U.S. Government Agency notes $ 7,391 $ 7,590
Municipal bonds 9,251 5,334
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 56,009 57,837
Collateralized mortgage obligations, U.S. Government Agencies 20,493 17,835
Corporate bonds 4,250 3,500
Total securities available-for-sale 97,394 92,096
CRA mutual funds 852 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock 3,372 4,496
Gross unrealized gains    
Available-for-sale    
U.S. Government Agency notes 124 83
Municipal bonds 240 45
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 503 170
Collateralized mortgage obligations, U.S. Government Agencies 186 85
Corporate bonds 37 76
Total securities available-for-sale 1,090 459
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
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 153 561
Collateralized mortgage obligations, U.S. Government Agencies 74 173
Corporate bonds
Total securities available-for-sale 229 737
CRA mutual funds
Non-marketable securities    
Federal Home Loan Bank of Boston stock
Fair value    
Available-for-sale    
U.S. Government Agency notes 7,513 7,670
Municipal bonds 9,491 5,379
Mortgage-backed securities, U.S. Government agencies and U.S. Government-sponsored enterprises 56,359 57,446
Collateralized mortgage obligations, U.S. Government Agencies 20,605 17,747
Corporate bonds 4,287 3,576
Total securities available-for-sale 98,255 91,818
CRA mutual funds 852 836
Non-marketable securities    
Federal Home Loan Bank of Boston stock $ 3,372 $ 4,496