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Commitments and Contingencies - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2012
Jun. 30, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]              
Unfunded commitments credit loss (reversal) provision $ 0   $ (1,200,000)        
(Reversal of) provision for credit losses on unfunded loan commitments 0 $ 248,000 (1,202,000) $ 610,000      
Litigation Matters              
Restricted cash and cash equivalents [1] $ 0 $ 0 $ 0 $ 0      
Visa Inc.              
Litigation Matters              
Settlement agreement amount         $ 4,000,000,000    
Restricted cash and cash equivalents           $ 894,000,000  
Minimum              
Loss Contingencies [Line Items]              
Weighted average remaining term (in years) 1 year   1 year        
Finance lease, initial contract terms (in years) 3 years   3 years        
Maximum              
Loss Contingencies [Line Items]              
Weighted average remaining term (in years) 11 years   11 years        
Finance lease, initial contract terms (in years) 4 years   4 years        
Total commitments and standby letters of credit | Interest payable and other liabilities              
Loss Contingencies [Line Items]              
Allowance for off balance sheet commitments $ 1,600,000   $ 1,600,000       $ 2,800,000
[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.