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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, 2025	Dec. 31, 2024
Description of assets
Total assets		$ 2,585
Loans, Excluding PCI Loans [Member]
Description of assets
Total assets	$ 92
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	14	11
Loans, Excluding PCI Loans [Member] | SBA [Member]
Description of assets
Total assets	51	49
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	17	220
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	10	9
Loans, Excluding PCI Loans [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets		2,296
Level 1 [Member]
Description of assets
Total assets		0
Level 1 [Member] | Loans, Excluding PCI Loans [Member]
Description of assets
Total assets	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] | Dairy & Livestock and Agribusiness [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	0
Level 2 [Member]
Description of assets
Total assets		0
Level 2 [Member] | Loans, Excluding PCI Loans [Member]
Description of assets
Total assets	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] | Dairy & Livestock and Agribusiness [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	0
Level 3 [Member]
Description of assets
Total assets		44,693
Level 3 [Member] | Loans, Excluding PCI Loans [Member]
Description of assets
Total assets	36,128
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	32,136	28,728
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SBA [Member]
Description of assets
Total assets	859	1,532
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	2,077	3,144
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	395	860
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	661	10,429
Carrying Value [Member]
Description of assets
Total assets		44,693
Carrying Value [Member] | Loans, Excluding PCI Loans [Member]
Description of assets
Total assets	36,128
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]
Description of assets
Total assets	32,136	28,728
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SBA [Member]
Description of assets
Total assets	859	1,532
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]
Description of assets
Total assets	2,077	3,144
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]
Description of assets
Total assets	395	860
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Other Real Estate Owned [Member]
Description of assets
Total assets	$ 661	$ 10,429

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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