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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Summary of Advances from the FHLB (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fixed rate:    
Outstanding balance $ 805,000 $ 805,000
Variable rate:    
Outstanding balance $ 130,000 $ 715,000
Weighted average interest rate (percent) 2.60% 2.56%
Minimum    
Fixed rate:    
Interest rate (percent) 1.61% 1.61%
Maximum    
Fixed rate:    
Interest rate (percent) 3.32% 3.32%
Weighted average (percent)    
Fixed rate:    
Interest rate (percent) 2.58% 2.58%