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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Including PCI Loans by Class of Loans (Parenthetical) (Detail) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 705,000 $ 1,400,000
Nonaccrual 27,804,000 [1],[2] 27,795,000 [3]
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 3,952,000 [1],[2] 1,529,000 [3]
Financial Guarantee [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 272,000,000  
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual   102,000,000
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 27,100,000 $ 26,300,000
[1] As of September 30, 2025, $705,000 of nonaccruing loans were current, $27.1 million were 90+ days past due.
[2] Excludes $272,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] As of December 31, 2024, $1.4 million of nonaccruing loans were current, $102,000 were 60-89 days past due, and $26.3 million were 90+ days past due.