Borrowings (Additional Information) (Details) - USD ($)	1 Months Ended		12 Months Ended
	Feb. 28, 2021	Apr. 30, 2006	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2006	Dec. 31, 2008
Short-term Debt [Line Items]
Federal Home Loan Bank Advances			$ 68,725,000
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 514,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged			1,800,000,000	$ 1,400,000,000
Line of credit, maximum borrowing capacity			$ 10,000,000
Line of credit, expiration date			Dec. 15, 2023
Securities Sold under Agreements to Repurchase			$ 196,451,000	211,608,000
Interest on subordinated debentures			2,140,000	2,523,000	$ 3,512,000
Long-term Line of Credit			0
Subordinated Debt			44,331,000	44,331,000
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
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral | Securities Investment
Short-term Debt [Line Items]
Financial Instruments, Owned, at Fair Value			22,000	$ 26,000
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			42,400,000
Long-term Line of Credit			0
Federal Reserve Bank Advances [Member] | Securities Investment
Short-term Debt [Line Items]
Financial Instruments, Owned, at Fair Value			$ 51,400,000
Junior Subordinated Debt
Short-term Debt [Line Items]
Percentage of trust preferred securities included in Tier I Capital ratio			8.30%
Value Of Trust Preferred Securities Included In Tier One Capital			$ 43,000,000
Subordinated Debt			$ 43,000,000
FHLBB Borrowing Maturing March 2025
Short-term Debt [Line Items]
Federal Home Loan Bank Advances	$ 25,000,000
Subsidiary One [Member] | Junior Subordinated Debt
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.07%	1.62%
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 One [Member] | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Debt interest rate, additional rate over three month LIBOR						0.26161%
Subsidiary Two [Member] | Junior Subordinated Debt
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.50%	1.54%
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
Long-term borrowings			$ 8,248,000	$ 8,248,000
Subsidiary Two [Member] | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)
Short-term Debt [Line Items]
Debt interest rate, additional rate over three month LIBOR						1.42%
Subsidiary Two [Member] | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Debt interest rate, additional rate over three month LIBOR						0.26161%