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INVESTMENT SECURITIES - Schedule of unrealized/unrecognized loss position of held-to-maturity (Details)
$ in Thousands
21 Months Ended
Sep. 30, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Held-to-maturity Securities [Abstract]    
Less than 12 Months, Estimated Fair Value $ 0 $ 3,260
Less than 12 Months, Unrealized/Unrecognized Losses 0 (33)
12 months or more, Estimated Fair Value 4,504 2,045
12 months or more, Unrealized/Unrecognized Losses (228) (65)
Total, Estimated Fair Value 4,504 5,305
Total, Unrealized/Unrecognized Losses (228) $ (98)
Other-than-temporary impairment loss recognized $ 0  
Number of securities of one issuer | item 0 0
Residential mortgage-backed securities    
Held-to-maturity Securities [Abstract]    
Less than 12 Months, Estimated Fair Value $ 0 $ 3,260
Less than 12 Months, Unrealized/Unrecognized Losses 0 (33)
12 months or more, Estimated Fair Value 4,504 2,045
12 months or more, Unrealized/Unrecognized Losses (228) (65)
Total, Estimated Fair Value 4,504 5,305
Total, Unrealized/Unrecognized Losses $ (228) $ (98)