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FEDERAL HOME LOAN BANK ADVANCES AND SHORT-TERM BORROWINGS - Financial Data of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]      
Weighted-average interest rate at end of year (percent) 2.27% 2.57% 1.60%
Average interest rate during the year (percent) 2.55% 2.15% 1.23%
Average balance $ 1,264,945 $ 1,627,608 $ 1,054,978
Maximum amount outstanding at any month-end 1,850,000 2,030,000 1,695,000
Balance at end of year $ 1,195,000 $ 1,520,000 $ 1,695,000