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FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
FEDERAL HOME LOAN BANK ADVANCES    
Average daily balance during the year $ 401,258 $ 275,592
Average interest rate during the year (as a percent) 1.52% 1.09%
Maximum month-end balance during the year $ 563,974 $ 496,684
Weighted average interest rate at year-end (as a percent) 1.57% 0.80%