Share-Based Payment Plans - Incentive Plan (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2018
Executive officers
Plan disclosures
Shares issued		84,335	64,962	23,435
Expenses recognized		$ 2,671,000	$ 1,870,000	$ 1,198,000
Unvested shares awarded		256,192	280,974	374,598
Unrecognized compensation costs		$ 6,801,000	$ 5,817,000	$ 4,499,000
Non executive directors
Plan disclosures
Value of shares available for issuance for compensation related to annual fees	$ 50,000				$ 10,000
Shares issued		12,173	12,443	6,870
Expenses recognized		$ 351,000	$ 325,000	$ 188,000