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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2012
Dec. 31, 2020
Loss Contingencies [Line Items]        
Unfunded commitments credit loss (reversal) provision $ (590)      
Litigation Matters        
Restricted cash and cash equivalents [1] 0 $ 0    
Unfunded Loan Commitment        
Loss Contingencies [Line Items]        
Unfunded commitments credit loss (reversal) provision   $ (102)    
Visa Inc.        
Litigation Matters        
Settlement agreement amount     $ 4,000,000  
Restricted cash and cash equivalents $ 894      
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 $ 2,200     $ 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.