Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Reserve for unfunded lending commitments	$ 28,946	$ 29,907	$ 31,526	$ 3,974