Employee Benefit Plans, Restricted Stock Plan (Details) - Restricted Stock [Member] - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Deferred Compensation Arrangements [Abstract]
Number of shares authorized (in shares)	150,000
Number of shares available for grant (in shares)	119,312
Unvested Shares [Roll Forward]
Outstanding, beginning of period (in shares)	6,954
Granted (in shares)	79
Forfeited (in shares)	(40)
Vested (in shares)	(61)
Outstanding, end of period (in shares)	6,932
Weighted Average Market Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 58.51
Granted (in dollars per share)	62.65
Forfeited (in dollars per share)	58.01
Vested (in dollars per share)	57.56
Outstanding, end of period (in dollars per share)	$ 58.57
Additional General Disclosures [Abstract]
Share-based compensation expense	$ 77,000	$ 84,000
Compensation cost related to nonvested awards that has not yet been recognized	$ 406,000
Period over which compensation cost is expected to be recognized	3 years