Commitments and Contingencies - Allowance for Credit Losses for Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 4,858	$ 7,004	$ 4,467	$ 3,112
Provision for credit losses	1,085	(1,816)	1,476	727
Balance at end of period	$ 5,943	$ 5,188	$ 5,943	$ 5,188
Accounting Standards Update [Extensible List]	ASU No. 2016-13	ASU No. 2016-13	ASU No. 2016-13	ASU No. 2016-13
Impact of adopting ASU 2016-13
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 0	$ 0	$ 0	$ 1,349
Balance after adoption of ASU 2016-13
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 4,858	$ 7,004	$ 4,467	$ 4,461