Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Commitments And Contingencies [Line Items]
Allowance for credit loss	$ 40,966	$ 49,828	$ 39,676	$ 52,420
Unfunded Commitments [Member] | Provision for Credit Losses [Member]
Commitments And Contingencies [Line Items]
Credit loss (benefit) expense	241	$ 276
Unfunded Commitments [Member] | Other Liabilities [Member]
Commitments And Contingencies [Line Items]
Allowance for credit loss	$ 2,000		$ 1,800