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Commitments and Contingent Liabilities - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2012
Dec. 31, 2021
Loss Contingencies [Line Items]            
Operating lease not yet commenced, liability $ 1,700,000   $ 1,700,000      
Minimum lease payments 25,612,000   25,612,000      
Litigation Matters            
Restricted cash and cash equivalents [1] 930,000 $ 1,930,000 930,000 $ 1,930,000    
Visa Inc.            
Litigation Matters            
Settlement agreement amount         $ 4,000,000,000  
Increase in litigation escrow account 600,000,000          
Restricted cash and cash equivalents $ 1,500,000,000   $ 1,500,000,000      
Minimum            
Loss Contingencies [Line Items]            
Weighted average remaining term (in years) 5 months   5 months      
Finance lease, initial contract terms (in years) 3 years   3 years      
Maximum            
Loss Contingencies [Line Items]            
Weighted average remaining term (in years) 10 years   10 years      
Finance lease, initial contract terms (in years) 5 years   5 years      
Total commitments and standby letters of credit            
Loss Contingencies [Line Items]            
Unfunded commitments credit loss reversal $ 0 $ 612,000 $ 318,000 $ 1,200,000    
Total commitments and standby letters of credit | Interest payable and other liabilities            
Loss Contingencies [Line Items]            
Allowance for off balance sheet commitments $ 1,500,000   $ 1,500,000     $ 1,800,000
[1] Restricted cash includes reserve requirements held with the Federal Reserve Bank of San Francisco and other cash pledged. In response to the COVID-19 pandemic, the Federal Reserve reduced the reserve requirement ratios to zero percent effective March 26, 2020.