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BORROWED FUNDS - Summary of Maturities of FHLBB (Details) - Fixed rate advances
$ in Thousands
Jun. 30, 2017
USD ($)
Principal  
2017 $ 609,000
2018 60,841
2019 104,927
2020 29,886
2021 31,470
2022 and thereafter 691
Total FHLBB advances $ 836,815
Weighted Average Rate  
2017 1.32%
2018 1.57%
2019 1.63%
2020 1.76%
2021 0.56%
2022 and thereafter 1.48%
Weighted Average  
Weighted Average Rate  
Total FHLBB advances 1.37%