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Parent Company - Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 1,343 | $ 1,750 | $ 1,982 | $ 1,505 | $ 1,628 | $ 1,888 | $ 1,918 | $ 1,611 | $ 1,763 | $ 4,756 | $ 5,115 | $ 6,865 | $ 7,180 | $ 7,028
Other |  |  |  |  |  |  |  |  |  | 253 | (158) | 121 | (831) | 263
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 6,029 | 5,416 | 7,182 | 7,459 | 9,897
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in short-term borrowings |  |  |  |  |  |  |  |  |  | (3,022) | (10,761) | 21,017 | 3,999 | 4,271
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  | (6,784) |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 11,239 |  |  |  | 74
Cash dividends |  |  |  |  |  |  |  |  |  | (1,710) | (1,645) | (2,153) | (2,121) | (2,097)
Net cash provided by (used for) financing activities |  |  |  |  |  |  |  |  |  | 21,558 | 28,216 | 50,374 | 18,709 | (22,953)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (474) | (2,344) | (1,889) | (554) | (19,153)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD |  | 23,295 |  |  | 25,639 |  |  |  | 26,193 | 23,750 | 25,639 | 25,639 | 26,193 | 45,346
CASH AND CASH EQUIVALENTS AT END OF PERIOD | $ 23,276 | 23,750 | $ 23,295 |  |  | 25,639 |  |  |  | 23,276 | 23,295 | 23,750 | 25,639 | 26,193
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | 6,865 | 7,180 | 7,028
Equity method investments, income (loss) |  |  |  |  |  |  |  |  |  |  |  | (3,587) | (4,772) | (5,378)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | 2,793 | 2,009 | 1,397
FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in short-term borrowings |  |  |  |  |  |  |  |  |  |  |  | 6,363 | (759) | (976)
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  | (6,784) |  |
Common stock issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 74
Stock options exercised |  |  |  |  |  |  |  |  |  |  |  | (7) | (50) | (77)
Proceeds from dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  | 651 | 590 | 736
Cash dividends |  |  |  |  |  |  |  |  |  |  |  | (2,153) | (2,121) | (2,097)
Net cash provided by (used for) financing activities |  |  |  |  |  |  |  |  |  |  |  | (1,930) | (2,340) | (2,340)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | 863 | (331) | (943)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD |  |  |  |  | $ 466 |  |  |  | $ 797 | $ 1,329 | $ 466 | 466 | 797 | 1,740
CASH AND CASH EQUIVALENTS AT END OF PERIOD |  | $ 1,329 |  |  |  | $ 466 |  |  |  |  |  | 1,329 | 466 | 797
Parent Company [Member] | Middlefield Banking Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  |  |  |  | (3,703) | (4,798) | (4,884)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 18 | 10 |
Other |  |  |  |  |  |  |  |  |  |  |  | (503) | (409) | (253)
Parent Company [Member] | Emerald Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | (598)
Parent Company [Member] | EMORECO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, income (loss) |  |  |  |  |  |  |  |  |  |  |  | $ 116 | $ 26 | $ 104

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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