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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 ($)
Mar. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 226,000 $ 228,000
Nonaccrual 6,175,000 [1] 4,930,000 [2],[3]
Small Business Administration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 702,000 [1] 443,000 [2],[3]
Small Business Administration [Member] | Financial Guarantee [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans   221,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 6,000,000.0  
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual   $ 4,700,000
[1] There were no guaranteed portion of nonaccrual SBA loans that are in process of collection.
[2] As of December 31, 2022, $228,000 of nonaccruing loans were current and $4.7 million were 90+ days past due.
[3] Excludes $221,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.