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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 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Description of assets |  |
Total assets | $ 828 | $ 561
Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 251 | 3
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 513 | 0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 478
Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 12
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 0 | 68
Loans, Excluding PCI Loans [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 64 | 0
Level 1 [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [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] | Small Business Administration [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] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [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] | Consumer and Other Loans [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 | 0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [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] | Small Business Administration [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] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [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] | Consumer and Other Loans [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 | 1,056 | 3,478
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 253 | 189
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 359 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 3,143
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 78
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 0 | 68
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 444 | 0
Carrying Value [Member] |  |
Description of assets |  |
Total assets | 1,056 | 3,478
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 253 | 189
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 359 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 3,143
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 78
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 0 | 68
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | $ 444 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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