Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Recorded Investment in Collateral-Dependent loans (Detail) $ in Thousands	Sep. 30, 2026 USD ($) Collateral	Dec. 31, 2025 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 8,309	$ 4,164
Business Assets	18,198	477
Other	$ 10,358	$ 0
Number of Loans Dependent on Collateral \| Collateral	49	5
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 4,399	$ 4,143
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral \| Collateral	4	1
Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 685
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral \| Collateral	1
SBA [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 2,652	$ 21
Business Assets	985	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral \| Collateral	9	1
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 0
Business Assets	17,213	477
Other	$ 10,358	$ 0
Number of Loans Dependent on Collateral \| Collateral	33	3
Consumer and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 573
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral \| Collateral	2