Commitments and Contingencies - Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	$ 125,559	$ 170,389
Balance at end of period	120,049	157,954
Unfunded Commitments
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	14,380	16,378
Provision for credit losses on unfunded commitments	1,882	(2,222)
Balance at end of period	$ 16,262	$ 14,156