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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Loss Contingencies [Line Items]      
ACL - OBS credit exposure $ 14,273 $ 14,373  
Residential Mortgage      
Loss Contingencies [Line Items]      
Valuation allowances and reserves, balance 1,100 1,100  
ACL - OBS credit exposure $ 9,700 $ 9,100  
Accounting Standards Update 2016-13 | Residential Mortgage      
Loss Contingencies [Line Items]      
Valuation allowances and reserves, balance     $ (2,100)