SECURITIES AVAILABLE FOR SALE - Schedule of Maturity of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Within 1 year	$ 0
Over 1 year to 5 years	33,179
Over 5 years to 10 years	57,285
Over 10 years	127,580
Total bonds and obligations	218,044
Mortgage-backed securities	437,844
Amortized Cost	655,888	$ 737,141
Fair Value
Within 1 year	0
Over 1 year to 5 years	34,004
Over 5 years to 10 years	58,138
Over 10 years	129,925
Total bonds and obligations	222,067
Mortgage-backed securities	441,163
Securities available for sale, at fair value	$ 663,230	$ 725,837