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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2019
Sep. 27, 2019
Sep. 17, 2018
Dec. 31, 2012
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Litigation Matters              
Restricted cash and cash equivalents [1]         $ 0   $ 10,015
Visa Inc.              
Litigation Matters              
Settlement agreement amount       $ 4,000,000      
Damages sought amended value     $ 4,100,000        
Loss contingency accrual, payments $ 467,000 $ 300,000          
Restricted cash and cash equivalents         $ 1,100,000    
Minimum              
Loss Contingencies [Line Items]              
Weighted average remaining term (in years)         1 year    
Finance lease, initial contract terms (in years)         3 years    
Maximum              
Loss Contingencies [Line Items]              
Weighted average remaining term (in years)         12 years    
Finance lease, initial contract terms (in years)         5 years    
Total commitments and standby letters of credit | Interest payable and other liabilities              
Loss Contingencies [Line Items]              
Allowance for off balance sheet commitments         $ 1,700 $ 1,100  
[1] Restricted cash includes reserve requirements held with the Federal Reserve Bank of San Francisco. In response to the COVID-19 pandemic, the Federal Reserve reduced the reserve requirement ratios to zero percent effective March 26, 2020.