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Commitments, Contingencies and Concentrations of Credit Risk - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Commitments [Line Items]      
Fixed-rate loan commitments 90 days    
Operating lease expense $ 6,438 $ 3,904  
Premises and Equipment      
Other Commitments [Line Items]      
Rental expense     $ 5,200
Operating lease expense $ 7,900 $ 5,000  
Minimum      
Other Commitments [Line Items]      
Interest rates 2.50%    
Maximum      
Other Commitments [Line Items]      
Interest rates 6.38%