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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
Jun. 30, 2019
Dec. 31, 2018
Description of assets    
Total assets $ 601  
Asset Held-for-Sale [Member]    
Description of assets    
Total assets 0  
Commercial and Industrial [Member]    
Description of assets    
Total assets 276  
Small Business Administration [Member]    
Description of assets    
Total assets 323  
Commercial Real Estate [Member]    
Description of assets    
Total assets 0  
Construction [Member]    
Description of assets    
Total assets 0  
SFR Mortgage [Member]    
Description of assets    
Total assets 0  
Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets 0  
Consumer and Other Loans [Member]    
Description of assets    
Total assets 2  
Other Real Estate Owned [Member]    
Description of assets    
Total assets 0 $ 0
Loans, Excluding PCI Loans [Member]    
Description of assets    
Total assets   561
Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets   0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets   3
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]    
Description of assets    
Total assets   0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets   478
Loans, Excluding PCI Loans [Member] | Construction [Member]    
Description of assets    
Total assets   0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets   0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets   12
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets   68
Level 1 [Member]    
Description of assets    
Total assets 0 0
Level 1 [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Small Business Administration [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Construction [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets 0  
Level 1 [Member] | Other Real Estate Owned [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
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets   0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [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
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]    
Description of assets    
Total assets   0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets   0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets   0
Level 1 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets   0
Level 2 [Member]    
Description of assets    
Total assets 0 0
Level 2 [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Small Business Administration [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Construction [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets 0  
Level 2 [Member] | Other Real Estate Owned [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
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets   0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [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
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]    
Description of assets    
Total assets   0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets   0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets   0
Level 2 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets   0
Level 3 [Member]    
Description of assets    
Total assets 2,345  
Level 3 [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets 0  
Level 3 [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets 1,190  
Level 3 [Member] | Small Business Administration [Member]    
Description of assets    
Total assets 1,153  
Level 3 [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets 0  
Level 3 [Member] | Construction [Member]    
Description of assets    
Total assets 0  
Level 3 [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets 0  
Level 3 [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets 0  
Level 3 [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets 2  
Level 3 [Member] | Other Real Estate Owned [Member]    
Description of assets    
Total assets 0 0
Level 3 [Member] | Loans, Excluding PCI Loans [Member]    
Description of assets    
Total assets   3,478
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets   0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets   189
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]    
Description of assets    
Total assets   0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets   3,143
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]    
Description of assets    
Total assets   0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets   0
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets   78
Level 3 [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets   68
Carrying Value [Member]    
Description of assets    
Total assets 2,345  
Carrying Value [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets 0  
Carrying Value [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets 1,190  
Carrying Value [Member] | Small Business Administration [Member]    
Description of assets    
Total assets 1,153  
Carrying Value [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets 0  
Carrying Value [Member] | Construction [Member]    
Description of assets    
Total assets 0  
Carrying Value [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets 0  
Carrying Value [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets 0  
Carrying Value [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets 2  
Carrying Value [Member] | Other Real Estate Owned [Member]    
Description of assets    
Total assets $ 0 0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member]    
Description of assets    
Total assets   3,478
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Asset Held-for-Sale [Member]    
Description of assets    
Total assets   0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Description of assets    
Total assets   189
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]    
Description of assets    
Total assets   0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Commercial Real Estate [Member]    
Description of assets    
Total assets   3,143
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Construction [Member]    
Description of assets    
Total assets   0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]    
Description of assets    
Total assets   0
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]    
Description of assets    
Total assets   78
Carrying Value [Member] | Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]    
Description of assets    
Total assets   $ 68