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FEDERAL HOME LOAN BANK ADVANCES - Financial Data of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]      
Weighted-average interest rate at end of year 2.57% 1.60% 0.67%
Average interest rate during the year 2.15% 1.23% 0.49%
Average balance $ 1,627,608 $ 1,054,978 $ 1,153,208
Maximum amount outstanding at any month-end 2,030,000 1,695,000 1,990,000
Balance at end of year $ 1,520,000 $ 1,695,000 $ 490,000