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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Federal Home Loan Bank, Advances, Branch of FHLBB Bank [Line Items]    
Federal Home Loan Bank advances $ 713,868 $ 1,141,464
Interest rate on PPPLF 0.35%  
Payment Protection Program Lending Facility $ 105,746 0
PPP loans pledged 105,700  
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advances, Branch of FHLBB Bank [Line Items]    
Federal Home Loan Bank advances 713,868 1,100,000
Unused line of credit with FHLBB 40,000 40,000
Unused remaining available borrowing capacity with FHLBB $ 828,400 $ 535,000