Employee Benefits (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) fund	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule Of Employee Benefits [Line Items]
Number of investment funds | fund			8
Number of equity funds | fund			6
Number of fixed income funds | fund			2
Percentage of internal revenue contribution			25.00%
Percentage of internal revenue service limitations			6.00%
Employer contribution in defined contribution plan			$ 823	$ 882
Accrued expenses and other liabilities	$ 28,832		28,832		$ 25,302
Non-interest expense	8,815	$ 9,239	27,307	27,829
Group Term Replacement Plan
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits	1,619		1,619		1,580
Postemployment benefit expense			39	36
Other Director and Officer Postretirement Benefits
Schedule Of Employee Benefits [Line Items]
Non-interest expense			45	65
Liability related to these postretirement benefits	2,045		2,045		2,031
Officers | Executive Plan
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	1,908		1,908		1,649
Non-interest expense			259	565
Directors' Plan | Directors
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	$ 3,055		3,055		$ 2,761
Non-interest expense			$ 155	$ 172
Minimum | Other Director and Officer Postretirement Benefits
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period			15 years
Minimum | Officers | Executive Plan
Schedule Of Employee Benefits [Line Items]
Terms of services			1 year
Maximum | Other Director and Officer Postretirement Benefits
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period			20 years
Maximum | Officers | Executive Plan
Schedule Of Employee Benefits [Line Items]
Terms of services			5 years