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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment
Dec. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]              
Other equity investments   $ 4,800,000 $ 4,800,000 $ 12,900,000      
Other investments   19,405,000 19,405,000 29,467,000      
Residential mortgage loans held for sale   7,700,000 7,700,000 14,100,000      
Loans held for sale   30,976,000 30,976,000 46,337,000      
Allowance for loan losses           $ 30,740,000  
Allowance for credit losses   $ 23,023,000 $ 23,023,000 35,893,000   30,740,000  
Estimated useful lives   us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember        
Lease Income     $ 0 0      
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]     srt:BoardOfDirectorsChairmanMember, srt:ChiefExecutiveOfficerMember        
Impairment of goodwill $ 26,800,000   $ 0 26,826,000      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ 327,788,000 327,788,000 185,989,000   248,793,000  
MSR sold mortgages unpaid principal balance   1,940,000,000 $ 1,940,000,000        
Loss from sale of MSR   3,600,000          
Number of reportable business segments | Segment     3        
Bank owned life insurance   1,083,000 $ 1,083,000 48,453,000      
Proceeds from surrender of bank owned life insurance policies     48,225,000 0      
Provision expense     (1,122,000) (7,071,000)      
Cumulative Effect, Period of Adoption, Adjustment [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Allowance for loan losses           7,418,000  
Allowance for credit losses           7,418,000  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest           $ (8,111,000) $ 3,500,000
ASC 326 [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Allowance for loan losses         $ 38,158,000    
Allowance for credit losses   7,400,000 7,400,000        
ASC 326 [Member] | Allowance for Credit Losses [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Reduced stockholders' equity   $ 5,200,000 5,200,000        
Minimum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Asset with financial institutions     1,000,000,000        
Maximum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Asset with financial institutions     $ 5,000,000,000        
Purchased Computer Software [Member] | Minimum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful lives   1 year 1 year        
Purchased Computer Software [Member] | Maximum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful lives   3 years 3 years        
Building [Member] | Maximum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful lives   40 years 40 years        
Furniture, Fixtures and Equipment [Member] | Minimum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful lives   3 years 3 years        
Furniture, Fixtures and Equipment [Member] | Maximum [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Estimated useful lives   15 years 15 years        
Special Mention [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Line Of credit facility current borrowing capacity   $ 500,000,000 $ 500,000,000        
Pooled Loans [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Line Of credit facility current borrowing capacity   1,000,000,000 1,000,000,000        
Fintech [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Loans held for sale   23,300,000 23,300,000 27,700,000      
Government Guaranteed Loans [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Loans held for sale   0 0 4,500,000      
Bank Owned Life Insurance [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Bank owned life insurance   $ 1,100,000 1,100,000 $ 48,500,000      
Bank Owned Life Insurance [Member] | Cash Surrender Value [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Gain loss on investment     0        
Provision expense     $ 2,200,000