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SECURITIES AVAILABLE FOR SALE - Schedule of Maturity of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available for sale, Amortized Cost
Within 1 year	$ 4,021
Over 1 year to 5 years	15,681
Over 5 years to 10 years	46,469
Over 10 years	111,558
Total bonds and obligations	177,729
Mortgage-backed securities	548,948
Amortized Cost	726,677	$ 719,983
Available for sale, Fair Value
Within 1 year	4,018
Over 1 year to 5 years	15,541
Over 5 years to 10 years	46,445
Over 10 years	110,475
Total bonds and obligations	176,479
Mortgage-backed securities	533,668
Total securities available for sale	$ 710,147	$ 717,242

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