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BORROWED FUNDS - Summary of Maturities of FHLB (Details) - Fixed rate advances
$ in Thousands
Mar. 31, 2018
USD ($)
Principal  
2018 $ 914,874
2019 150,080
2020 53,737
2021 216
2022 and beyond 6,953
Total FHLB advances $ 1,125,860
Weighted Average  
Weighted Average Rate (as a percent)  
2018 1.88%
2019 1.64%
2020 2.04%
2021 2.96%
2022 and beyond 2.64%
Total FHLB advances 1.86%