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BORROWED FUNDS - Summary of Maturities of FHLBB (Details) - Fixed rate advances
$ in Thousands
Sep. 30, 2017
USD ($)
Carrying Value  
2017 $ 416,000
2018 165,805
2019 104,947
2020 29,911
2021 1,630
2022 and thereafter 15,689
Total FHLBB advances $ 733,982
Weighted Average Rate  
2017 1.32%
2018 1.49%
2019 1.63%
2020 1.76%
2021 1.49%
2022 and thereafter 0.36%
Total FHLBB advances 1.40%