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DEBT SECURITIES - Amortized cost and estimated fair values of securities by contractual maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available for Sale - Amortized Cost    
Amortized cost, 1 year or less $ 3,232 $ 6,203
Amortized cost, 1 year through 5 years 22,692 26,811
Amortized cost, 5 years through 10 years 8,266 9,215
Amortized cost, After 10 years 195,325 181,439
Available-for-sale Securities, Amortized Cost Basis, Total 229,515 223,668
Available for Sale - Estimated Fair Value    
Estimated fair value, 1 year or less 3,186 6,194
Estimated fair value, 1 year through 5 years 22,081 26,635
Estimated fair value, 5 years through 10 years 8,285 9,348
Estimated fair value, After 10 years 188,910 180,998
Available-for-sale Securities, Total 222,462 223,175
Held to Maturity - Amortized Cost    
Amortized cost, After 10 years 31 33
Held-to-maturity Securities, Total 31 33
Held to Maturity - Estimated Fair Value    
Estimated fair value, After 10 years 33 35
Held-to-maturity Securities, Fair Value, Total $ 33 $ 35