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Commitments, Guarantees, Concentrations and Contingencies (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
repurchase_obligation
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Lessee, Lease, Description [Line Items]      
Non-cash operating lease right-of-use assets obtained in exchange for new operating lease liabilities $ 1,666,000    
Occupancy expense $ 7,758,000 $ 7,207,000  
Number of repurchase obligations | repurchase_obligation 3    
Estimated repurchase obligations $ 7,100,000   $ 5,900,000
Loans sold, subject to terms and conditions of repurchase obligations 8,300,000,000   6,700,000,000
Letters of credit outstanding with financial institutions 6,400,000   6,400,000
Collateral amount 1,300,000   1,300,000
Minimum net worth noncompliance, fines and penalties accrued 0   0
Commitments to Extend Credit      
Lessee, Lease, Description [Line Items]      
Commitment to fund a line of credit 20,000,000    
Unfunded Loan Commitment      
Lessee, Lease, Description [Line Items]      
Loans held for investment, after allowance for credit loss 2,800,000    
Commitment to fund a line of credit 17,200,000    
Asset Pledged as Collateral      
Lessee, Lease, Description [Line Items]      
Letters of credit outstanding with financial institutions $ 27,200,000   $ 27,200,000
Minimum      
Lessee, Lease, Description [Line Items]      
Operating lease, renewal term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Operating lease, renewal term 10 years