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Condensed Financial Statements of Parent Company - Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Related party receivables: |  |  |  |
Total Assets | $ 989,068 | $ 941,213 |  |
Liabilities |  |  |  |
Dividends payable | 1,007 | 965 |  |
Total liabilities | 868,971 | 826,720 |  |
Stockholders' Equity | 120,097 | 114,493 | $ 108,617 | $ 110,489
Total Liabilities and Stockholders' Equity | 989,068 | 941,213 |  |
Farmers & Merchants State Bank [Member] |  |  |  |
Assets |  |  |  |
Cash | 787 | 302 |  |
Related party receivables: |  |  |  |
Dividends & Accounts receivable from subsidiaries | 1,730 | 2,227 |  |
Accrued interest receivable Municipals | 63 | 58 |  |
Securities-Municipals | 16,388 | 14,998 |  |
Investment in subsidiaries | 102,178 | 98,088 |  |
Total Assets | 121,146 | 115,673 |  |
Liabilities |  |  |  |
Accrued expenses | 42 | 215 |  |
Dividends payable | 1,007 | 965 |  |
Total liabilities | 1,049 | 1,180 |  |
Stockholders' Equity | 120,097 | 114,493 |  |
Total Liabilities and Stockholders' Equity | $ 121,146 | $ 115,673 |  |

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