XML 137 R105.htm IDEA: XBRL DOCUMENT v3.5.0.2
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