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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, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 206,000 $ 13,000,000
Nonaccrual 21,913,000 [1],[2] 21,302,000 [3]
Small Business Administration Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 151,000 [1],[2] 969,000 [3]
Small Business Administration Loans [Member] | Financial Guarantee [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 165,000,000  
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 8,000,000 16,000,000,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 60,000  
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 13,600,000 $ 8,300,000
[1] As of September 30, 2024, $206,000 of nonaccruing loans were current, $8.0 million were 30-59 days past due, $60,000 were 60-89 days past due, and $13.6 million were 90+ days past due.
[2] Excludes $165,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] As of December 31, 2023, $13.0 million of nonaccruing loans were current, $16,000 were 30-59 days past due, and $8.3 million were 90+ days past due.