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Borrowings (Narrative - Federal Home Loan Bank Advances) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]    
Federal Home Loan Bank advances $ 1,125,000 $ 1,190,000
Interest rate swaps [Member] | Designated as Hedging Instrument [Member]    
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]    
Notional amount [1] 120,000 120,000
Federal Home Loan Bank of Boston [Member]    
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]    
Federal Home Loan Bank advances 1,125,000 1,200,000
Unused line of credit with Federal Home Loan Bank 40,000 40,000
Standby letter of credit with FHLB 66,000 65,000
Remaining borrowing capacity with the FHLB $ 753,000 $ 1,100,000
[1] The fair value of derivative assets includes accrued interest receivable of $120 thousand and $239 thousand, respectively, at December 31, 2024 and 2023. There was no accrued interest payable included in the fair value of derivative liabilities at December 31, 2024 and December 31, 2023.