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Commitments, Guarantees, Concentrations and Contingencies (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
repurchase_obligation
Dec. 31, 2022
USD ($)
Lessee, Lease, Description [Line Items]    
Non-cash operating lease right-of-use assets obtained in exchange for new operating lease liabilities $ 822,000  
Operating lease, impairment expense $ 1,243,000  
Number of repurchase obligations | repurchase_obligation 3  
Estimated repurchase obligations $ 1,000,000.0 $ 1,400,000
Loans sold, subject to terms and conditions of repurchase obligations 5,000,000,000 5,100,000,000
Letters of credit outstanding with financial institutions 8,600,000 9,100,000
Collateral amount 2,600,000 3,100,000
Minimum net worth noncompliance, fines and penalties accrued 0 0
Asset Pledged as Collateral    
Lessee, Lease, Description [Line Items]    
Letters of credit outstanding with financial institutions $ 13,700,000 $ 11,700,000
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease, renewal term 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease, renewal term 10 years