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BORROWED FUNDS - Summary of Maturities of FHLBB (Details) - Fixed rate advances
$ in Thousands
Mar. 31, 2017
USD ($)
Principal  
2017 $ 580,755
2018 60,830
2019 104,933
2020 29,893
2020 and beyond 32,182
Total FHLBB advances $ 808,593
Weighted Average  
Weighted Average Rate (as a percent)  
2017 0.93%
2018 0.64%
2019 1.63%
2020 1.76%
2020 and beyond 0.46%
Total FHLBB advances 1.19%