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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, 2016 | Dec. 31, 2015
--- | --- | ---
Description of assets |  |
Total assets | $ 152 | $ 539
Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 28 | 162
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 73 | 228
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 33 | 15
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 13
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 0 | 20
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 18 | 101
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 | 678 | 9,714
Level 3 [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 313 | 948
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 144 | 228
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 202 | 41
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 7,651
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 0 | 588
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | 19 | 258
Carrying Value [Member] |  |
Description of assets |  |
Total assets | 678 | 9,714
Carrying Value [Member] | Other Real Estate Owned [Member] |  |
Description of assets |  |
Total assets | 313 | 948
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] |  |
Description of assets |  |
Total assets | 144 | 228
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] |  |
Description of assets |  |
Total assets | 202 | 41
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member] |  |
Description of assets |  |
Total assets | 0 | 7,651
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] |  |
Description of assets |  |
Total assets | 0 | 588
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] |  |
Description of assets |  |
Total assets | 0 | 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] |  |
Description of assets |  |
Total assets | $ 19 | $ 258

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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=66048111&loc=d3e19207-110258 + Details
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