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SECURITIES AVAILABLE FOR SALE - Schedule of Maturity of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available for sale, Amortized Cost
Within 1 year	$ 4,028
Over 1 year to 5 years	15,587
Over 5 years to 10 years	45,826
Over 10 years	110,806
Total bonds and obligations	176,247
Mortgage-backed securities	558,791
Amortized Cost	735,038	$ 719,983
Available for sale, Fair Value
Within 1 year	4,027
Over 1 year to 5 years	15,446
Over 5 years to 10 years	45,418
Over 10 years	108,359
Total bonds and obligations	173,250
Mortgage-backed securities	539,408
Total securities available for sale	$ 712,658	$ 717,242

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