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Commitments, Guarantees, Concentrations and Contingencies (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
repurchase_obligation
Sep. 30, 2022
USD ($)
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     $ 7,881,000    
Non-cash operating lease right-of-use assets obtained in exchange for new operating lease liabilities acquired through acquisitions     8,553,000    
Operating lease, impairment expense     1,243,000    
Occupancy expense $ 8,878,000 $ 8,453,000 $ 23,858,000 $ 24,950,000  
Number of repurchase obligations | repurchase_obligation     3    
Estimated repurchase obligations 4,100,000   $ 4,100,000   $ 1,400,000
Loans sold, subject to terms and conditions of repurchase obligations 5,400,000,000   5,400,000,000   5,100,000,000
Letters of credit outstanding with financial institutions 6,400,000   6,400,000   9,100,000
Collateral amount 1,300,000   1,300,000   3,100,000
Minimum net worth noncompliance, fines and penalties accrued 0   0   0
Commitments to Extend Credit          
Lessee, Lease, Description [Line Items]          
Commitment to fund a line of credit 20,000,000   20,000,000    
Asset Pledged as Collateral          
Lessee, Lease, Description [Line Items]          
Letters of credit outstanding with financial institutions $ 13,700,000   $ 13,700,000   $ 11,700,000
Minimum          
Lessee, Lease, Description [Line Items]          
Operating lease, renewal term 1 year   1 year    
Maximum          
Lessee, Lease, Description [Line Items]          
Operating lease, renewal term 10 years   10 years