Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
ACL - OBS credit exposure	$ 14,773	$ 14,373
Valuation allowances and reserves, balance	4,700	5,300
Residential Mortgage
Loss Contingencies [Line Items]
ACL - OBS credit exposure	10,100	9,100
Valuation allowances and reserves, balance	$ 1,300	$ 1,100