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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, 2015 | Dec. 31, 2014
--- | --- | ---
Description of assets |  |
Total assets | $ 539 | $ 2,846
Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 162 | 0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 228 | 771
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 15 | 296
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 271
Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 13 | 0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 20 | 0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 1,061
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 101 | 447
Level 1 [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 1 [Member] | Other Real Estate Owned [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 2 [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 2 [Member] | Other Real Estate Owned [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 3 [Member] |  |
Description of assets |  |
Total assets | 9,714 | 6,323
Level 3 [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 948 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 228 | 1,911
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 41 | 1,327
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 2,500
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 7,651 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 588 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 103
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 258 | 482
Carrying Value [Member] |  |
Description of assets |  |
Total assets | 9,714 | 6,323
Carrying Value [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 948 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 228 | 1,911
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 41 | 1,327
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets |  | 2,500
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 7,651 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 588 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets |  | 103
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | $ 258 | $ 482

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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