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DEPOSITS - Components of Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
Noninterest-bearing deposits $ 1,023,360 $ 1,071,608
Interest-bearing deposits    
Interest-bearing demand deposits 1,556,410 2,089,016
Money market accounts 873,153 1,146,859
Savings accounts 1,265,847 1,059,628
Certificates of deposit of $250,000 or less 2,388,592 1,365,452
Certificates of deposit of more than $250,000 809,282 560,340
Total interest-bearing deposits 6,893,284 6,221,295
Total deposits $ 7,916,644 $ 7,292,903