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DEPOSITS - Components of Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deposits [Abstract]    
Noninterest-bearing deposits $ 1,071,608 $ 1,282,629
Interest-bearing deposits    
Interest-bearing demand deposits 2,089,016 2,048,839
Money market accounts 1,146,859 2,731,314
Savings accounts 1,059,628 1,118,175
Certificates of deposit of $250,000 or less 1,365,452 1,550,235
Certificates of deposit of more than $250,000 560,340 410,958
Total interest-bearing deposits 6,221,295 7,859,521
Total deposits $ 7,292,903 $ 9,142,150