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Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral	$ 1,400,000	$ 1,300,000
FHLB advances, securities pledged as collateral	26	38
Federal Home Loan Bank Advances	$ 0	$ 25,000
Long-term Debt [Member]
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Debt, Weighted Average Interest Rate	0.00%	0.98%
Short-term Debt
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Debt, Weighted Average Interest Rate	0.25%	0.34%
FHLBB Borrowing Maturing March 2025
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Federal Home Loan Bank Advances	$ 25,000
FHLBB Borrowing Maturing March 2025 | Long-term Debt [Member]
Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]
Debt, Weighted Average Interest Rate	0.00%	0.98%
Federal Home Loan Bank Advances	$ 0	$ 25,000

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Maturity Schedule Of Federal Home Loan Bank Advances [Line Items]

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Weighted average interest rate of debt outstanding.

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Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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