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Loans and Leases Held for Investment, Net of Allowance For Loan and Lease Losses - Schedule of Components of Portfolio Segment by Class of Financing Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment $ 2,707,992   $ 0
Allowance for loan and lease losses (ALLL) (104,736) $ (71,081) 0
Loans and leases held for investment, net 2,603,256   0
Loans pledged as collateral under the FRB discount window $ 391,500    
Allowance Ratios 3.90%    
Allowance for loan and lease losses to commercial loans and leases held for investment, excluding PPP loans, percent 4.50%    
Consumer Portfolio Segment      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment $ 1,715,238    
Allowance for loan and lease losses (ALLL) (88,631) (54,058) 0
Loans and leases held for investment, net $ 1,626,607    
Allowance Ratios 5.20%    
Consumer Portfolio Segment | Unsecured personal      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment $ 1,258,279    
Consumer Portfolio Segment | Residential mortgages      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment 141,200    
Consumer Portfolio Segment | Secured consumer      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment 314,539    
Consumer Portfolio Segment | Other consumer      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment 1,220    
Commercial Portfolio Segment      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment 992,754    
Allowance for loan and lease losses (ALLL) (16,105) $ (17,023) $ 0
Loans and leases held for investment, net $ 976,649    
Allowance Ratios 1.60%    
Allowance for loan and lease losses to commercial loans and leases held for investment, excluding PPP loans, percent 2.60%    
Commercial Portfolio Segment | Equipment finance      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment $ 157,457    
Commercial Portfolio Segment | Commercial real estate      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment 316,135    
Commercial Portfolio Segment | Commercial and industrial      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment 519,162    
Commercial Portfolio Segment | Commercial and industrial loan, PPP      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans and leases held for investment $ 367,600