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SECURITIES - Aggreggate fair value and gross unrealized loss of securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Less Than 12 Months, Fair value    
Available-for-sale    
Municipal bonds $ 479 $ 517
Mortgage-backed securities 15,914 34,758
Collateralized mortgage obligations, U.S. Government agencies 9,317  
Collateralized mortgage obligations, Non-agency 60
SBA bonds 8,519 475
CRA mutual funds 835 818
Corporate bonds 1,491 498
Total temporarily impaired securities 36,555 37,126
Other than temporarily impaired securities, Collateralized mortgage obligations, Non-agency 101 174
Total temporarily impaired and other-than-temporarily impaired securities 36,656 37,300
Less Than 12 Months, Unrealized losses    
Available-for-sale    
Municipal bonds 1 1
Mortgage-backed securities 99 329
Collateralized mortgage obligations, U.S. Government agencies 87  
Collateralized mortgage obligations, Non-agency
SBA bonds 20 1
CRA mutual funds 16 16
Corporate bonds 9 3
Total temporarily impaired securities 232 350
Other than temporarily impaired securities, Collateralized mortgage obligations, Non-agency 14 1
Total temporarily impaired and other-than-temporarily impaired securities 246 351
12 Months or Longer, Fair value    
Available-for-sale    
Municipal bonds
Mortgage-backed securities 17,892 249
Collateralized mortgage obligations, U.S. Government agencies  
Collateralized mortgage obligations, Non-agency 77 339
SBA bonds
CRA mutual funds
Corporate bonds
Total temporarily impaired securities 17,969 588
Other than temporarily impaired securities, Collateralized mortgage obligations, Non-agency
Total temporarily impaired and other-than-temporarily impaired securities 17,969 599
12 Months or Longer, Unrealized losses    
Available-for-sale    
Municipal bonds
Mortgage-backed securities 168 6
Collateralized mortgage obligations, U.S. Government agencies  
Collateralized mortgage obligations, Non-agency 3 5
SBA bonds
CRA mutual funds
Corporate bonds
Total temporarily impaired securities 171 11
Other than temporarily impaired securities, Collateralized mortgage obligations, Non-agency
Total temporarily impaired and other-than-temporarily impaired securities 171 11
Total, Fair value    
Available-for-sale    
Municipal bonds 479 517
Mortgage-backed securities 33,806 35,007
Collateralized mortgage obligations, U.S. Government agencies 9,317  
Collateralized mortgage obligations, Non-agency 77 399
SBA bonds 8,519 475
CRA mutual funds 835 818
Corporate bonds 1,491 498
Total temporarily impaired securities 54,524 37,714
Other than temporarily impaired securities, Collateralized mortgage obligations, Non-agency 101 174
Total temporarily impaired and other-than-temporarily impaired securities 54,625 37,888
Total, Unrealized losses    
Available-for-sale    
Municipal bonds 1 1
Mortgage-backed securities 267 335
Collateralized mortgage obligations, U.S. Government agencies 87  
Collateralized mortgage obligations, Non-agency 3 5
SBA bonds 20 1
CRA mutual funds 16 16
Corporate bonds 9 3
Total temporarily impaired securities 403 361
Other than temporarily impaired securities, Collateralized mortgage obligations, Non-agency 14 1
Total temporarily impaired and other-than-temporarily impaired securities $ 417 $ 362