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SECURITIES - Amortized cost and estimated fair values of securities by contractual maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available for Sale - Amortized Cost    
Amortized cost, 1 year or less $ 6,203 $ 5,579
Amortized cost, 1 year through 5 years 26,811 28,946
Amortized cost, 5 years through 10 years 9,215 20,834
Amortized cost, After 10 years 181,439 152,002
Available-for-sale Securities, Amortized Cost Basis, Total 223,668 207,361
Available for Sale - Estimated Fair Value    
Estimated fair value, 1 year or less 6,194 5,570
Estimated fair value, 1 year through 5 years 26,635 28,937
Estimated fair value, 5 years through 10 years 9,348 20,880
Estimated fair value, After 10 years 180,998 150,557
Available-for-sale Securities, Total 223,175 205,944
Held to Maturity - Amortized Cost    
Amortized cost, After 10 years 33 34
Held-to-maturity Securities, Total 33 34
Held to Maturity - Estimated Fair Value    
Estimated fair value, After 10 years 35 37
Held-to-maturity Securities, Fair Value, Total $ 35 $ 37