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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 01, 2021
USD ($)
Sep. 30, 2021
USD ($)
loan
borrower
store
Sep. 30, 2021
USD ($)
store
loan
borrower
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Property, Plant and Equipment [Line Items]          
Short-term loan modification program, number of loans | loan   6 6   36
Short-term loan modification program, outstanding exposure   $ 70,000 $ 70,000   $ 72,000
Short-term loan modification program, outstanding exposure, percent   1.00% 1.00%   0.90%
Number of contracts modified in TDR | loan     0 2  
PPP loans, net   $ 6,767,957 $ 6,767,957   $ 7,650,633
Proceeds from sale of SBA PPP loans     170,154 $ 0  
Allowance for credit losses   256 $ 256   $ 167
Subordinated Notes, 5.0%          
Property, Plant and Equipment [Line Items]          
Repayments of debt $ 150,000        
PPP loans          
Property, Plant and Equipment [Line Items]          
Interest rate (as a percent)     1.00%    
PPP loans, net   $ 67,300 $ 67,300    
Number of borrowers | borrower   109 109    
Proceeds from sale of SBA PPP loans   $ 170,000      
PPP loans | Minimum          
Property, Plant and Equipment [Line Items]          
Term of the loans granted     2 years    
PPP loans | Maximum          
Property, Plant and Equipment [Line Items]          
Term of the loans granted     5 years    
Small Business Administration          
Property, Plant and Equipment [Line Items]          
Decrease for debt forgiveness   $ 171,000      
Banking Services          
Property, Plant and Equipment [Line Items]          
Number of locations | store   18 18    
Lending Services          
Property, Plant and Equipment [Line Items]          
Number of locations | store   5 5