Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral	$ 1,800,000	$ 1,400,000
Federal Home Loan Bank Advances	$ 68,725
Short-term Debt
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Debt, Weighted Average Interest Rate	1.98%	0.25%
FHLBB Borrowing Maturing January 2023 | Long-term Debt [Member]
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Debt, Weighted Average Interest Rate	4.38%
Federal Home Loan Bank Advances	$ 18,725
FHLBB Borrowing Maturing March 2023 | Long-term Debt [Member]
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Debt, Weighted Average Interest Rate	4.93%
Federal Home Loan Bank Advances	$ 50,000