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SECURITIES - Amortized cost, fair value and tax equivalent yield of securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Municipal bonds - Within 1 year  
Amortized cost $ 353
Fair value $ 353
Yield 6.17%
Municipal bonds - After 1 year but within 5 years  
Amortized cost $ 439
Fair value $ 440
Yield 5.03%
Municipal bonds - After 10 years but within 15 years  
Amortized cost $ 1,494
Fair value $ 1,500
Yield 7.15%
Municipal bonds - After 15 years  
Amortized cost $ 1,190
Fair value $ 1,193
Yield 7.13%
Municipal bonds - Total  
Amortized cost $ 3,476
Fair value $ 3,486
Yield 6.78%
Mortgage-backed securities - U.S. Government agency and U.S. Government-sponsored enterprises  
Amortized cost $ 45,983
Fair value $ 45,868
Yield 2.33%
Collateralized mortgage obligations - U.S. Government agency and U.S. Government-sponsored enterprises  
Amortized cost $ 10,462
Fair value $ 10,377
Yield 2.76%
Collateralized mortgage obligations - Non-agency  
Amortized cost $ 2,271
Fair value $ 2,664
Yield 3.97%
SBA bonds  
Amortized cost $ 12,278
Fair value $ 12,267
Yield 2.99%
CRA mutual funds  
Amortized cost $ 851
Fair value $ 835
Yield 2.17%
Corporate bonds - After 5 years but within 10 years  
Amortized cost $ 3,500
Fair value $ 3,550
Yield 5.57%
Securities available-for-sale  
Amortized cost $ 78,821
Fair value $ 79,047
Yield 2.87%