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Leases - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Oct. 27, 2020
Branches
Leases [Abstract]      
Undiscounted contract amount operating leases not yet commenced   $ 2.9  
PB | Branches closure      
Leases      
Asset impairment charges $ 15.9    
Number of branches closed | Branches     11
Minimum      
Leases      
Remaining lease term of contract   1 month 6 days  
Operating lease contract not yet commenced   10 years  
Maximum      
Leases      
Remaining lease term of contract   32 years 3 months 18 days  
Lessee remaining lease renewal term   20 years  
Operating lease contract not yet commenced   20 years