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Borrowings (Additional Information) (Details) - USD ($)		1 Months Ended		12 Months Ended
	Oct. 08, 2015	Feb. 28, 2021	Apr. 30, 2006	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2006	Dec. 31, 2008
Short-term Debt [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged				$ 1,400,000,000	$ 1,300,000,000
Line of credit, maximum borrowing capacity				$ 10,000,000
Line of credit, expiration date				Dec. 16, 2022
Security Owned and Pledged as Collateral, Fair Value				$ 641,200,000	507,100,000
Securities Sold under Agreements to Repurchase				211,608,000	162,439,000
Interest on subordinated debentures				2,523,000	3,512,000	$ 3,266,000
Long-term Line of Credit				0
Federal Home Loan Bank Advances				0	25,000,000
Payment for Debt Extinguishment or Debt Prepayment Cost		$ 514,000
Subordinated Debt	$ 15,000,000			44,331,000	59,331,000
Subordinated Borrowing, Interest Rate	5.50%
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity				9,900,000	9,900,000
Long-term Line of Credit				0
PNC [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity				50,000,000
Long-term Line of Credit				0
Federal Reserve Bank Advances [Member]
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity				54,700,000
Security Owned and Pledged as Collateral, Fair Value				56,500,000
Long-term Line of Credit				$ 0
Junior Subordinated Debt
Short-term Debt [Line Items]
Percentage of trust preferred securities included in Tier I Capital ratio				8.80%
Value Of Trust Preferred Securities Included In Tier One Capital				$ 43,000,000
Subordinated Debentures [Member] | Subordinated Debt [Member]
Short-term Debt [Line Items]
Debt Issuance Costs, Net				0	251,000	$ 115,000
Long-term borrowings				0	15,000,000
FHLBB Borrowing Maturing March 2025
Short-term Debt [Line Items]
Federal Home Loan Bank Advances				$ 25,000,000
Tier II Capital [Member]
Short-term Debt [Line Items]
Subordinated Debt					$ 12,000,000
Subsidiary One [Member] | Junior Subordinated Debt
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				1.62%	1.64%
Value of outstanding common shares of subsidiary owned by company			$ 1,100,000
Proceeds from issuance of trust preferred securities			$ 36,100,000
Debt interest rate, additional rate over three month LIBOR			1.40%
Long-term borrowings				$ 36,083,000	$ 36,083,000
Subsidiary Two [Member] | Junior Subordinated Debt
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms							The contract interest rate of the trust preferred securities is the average three-month LIBOR plus 1.42%.
Debt Instrument, Interest Rate, Stated Percentage				1.54%	1.66%
Value of outstanding common shares of subsidiary owned by company							$ 248,000
Trust preferred securities assumed in acquisition								$ 8,000,000
Aggregate amount of junior subordinated debt issued to subsidiary by acquired company, prior to acquisition							$ 8,200,000
Debt Instrument, Term							30 years
Debt interest rate, additional rate over three month LIBOR							142.00%
Long-term borrowings				$ 8,248,000	$ 8,248,000

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Aggregate amount of junior subordinated debt issued to subsidiary by acquired company, prior to acquisition.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Interest expense incurred during the reporting period on junior subordinated debentures. Includes amortization of expenses incurred in the issuance of subordinated notes and debentures.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Date the credit facility terminates, in YYYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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