Fair Value Information - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value on Non-Recurring Basis [Member] - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Description of assets
Total assets	$ 1,181	$ 256
Loans, Excluding PCI Loans [Member] \| Commercial Real Estate [Member]
Description of assets
Total assets	21	2
Loans, Excluding PCI Loans [Member] \| SBA [Member]
Description of assets
Total assets	0	0
Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Description of assets
Total assets	1,160	254
Loans, Excluding PCI Loans [Member] \| Other Real Estate Owned [Member]
Description of assets
Total assets		0
Level 1 [Member]
Description of assets
Total assets	0	0
Level 1 [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Level 1 [Member] \| Loans, Excluding PCI Loans [Member] \| SBA [Member]
Description of assets
Total assets	0	0
Level 1 [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Description of assets
Total assets	0	0
Level 1 [Member] \| Loans, Excluding PCI Loans [Member] \| Other Real Estate Owned [Member]
Description of assets
Total assets		0
Level 2 [Member]
Description of assets
Total assets	0	0
Level 2 [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial Real Estate [Member]
Description of assets
Total assets	0	0
Level 2 [Member] \| Loans, Excluding PCI Loans [Member] \| SBA [Member]
Description of assets
Total assets	0	0
Level 2 [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Description of assets
Total assets	0	0
Level 2 [Member] \| Loans, Excluding PCI Loans [Member] \| Other Real Estate Owned [Member]
Description of assets
Total assets		0
Level 3 [Member]
Description of assets
Total assets	5,051	21,754
Level 3 [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial Real Estate [Member]
Description of assets
Total assets	3,212	12,614
Level 3 [Member] \| Loans, Excluding PCI Loans [Member] \| SBA [Member]
Description of assets
Total assets	646	24
Level 3 [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Description of assets
Total assets	1,193	8,953
Level 3 [Member] \| Loans, Excluding PCI Loans [Member] \| Other Real Estate Owned [Member]
Description of assets
Total assets		163
Carrying Value [Member]
Description of assets
Total assets	5,051	21,754
Carrying Value [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial Real Estate [Member]
Description of assets
Total assets	3,212	12,614
Carrying Value [Member] \| Loans, Excluding PCI Loans [Member] \| SBA [Member]
Description of assets
Total assets	646	24
Carrying Value [Member] \| Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Description of assets
Total assets	$ 1,193	8,953
Carrying Value [Member] \| Loans, Excluding PCI Loans [Member] \| Other Real Estate Owned [Member]
Description of assets
Total assets		$ 163