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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2012
Dec. 31, 2020
Loss Contingencies [Line Items]            
Unfunded commitments credit loss (reversal) provision $ (612)   $ (1,200)      
Litigation Matters            
Restricted cash and cash equivalents [1] 0 $ 0 0 $ 0    
Unfunded Loan Commitment            
Loss Contingencies [Line Items]            
Unfunded commitments credit loss (reversal) provision   $ 260   $ 362    
Visa Inc.            
Litigation Matters            
Settlement agreement amount         $ 4,000,000  
Restricted cash and cash equivalents $ 894,000   $ 894,000      
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   $ 1,600     $ 2,800
[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.