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Parent Company - Condensed Statement of Income and Comprehensive Income (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
INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total income | $ 7,420 |  | $ 7,151 |  |  |  |  |  |  | $ 22,173 | $ 21,252 | $ 28,595 | $ 27,874 | $ 28,178
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 1,026 | $ 988 | 959 | $ 990 | $ 883 | $ 1,005 | $ 999 | $ 1,033 | $ 1,033 | 3,117 | 2,832 | 3,820 | 4,070 | 5,250
Income before income tax benefit | 1,604 | 2,048 | 2,526 | 1,821 | 2,032 | 2,438 | 2,447 | 2,025 | 2,262 | 5,885 | 6,379 | 8,427 | 9,172 | 9,007
Income tax benefit | 261 | 298 | 544 | 316 | 404 | 550 | 529 | 414 | 499 | 1,129 | 1,264 | 1,562 | 1,992 | 1,979
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
Comprehensive Income (Loss) | $ 1,080 |  | $ 2,777 |  |  |  |  |  |  | $ 5,977 | $ 4,484 | 6,712 | 11,965 | (600)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiary bank |  |  |  |  |  |  |  |  |  |  |  | 4,023 | 3,142 | 2,198
Other |  |  |  |  |  |  |  |  |  |  |  | 19 | 8 | 5
Total income |  |  |  |  |  |  |  |  |  |  |  | 4,042 | 3,150 | 2,203
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 290 | 304 | 361
Other |  |  |  |  |  |  |  |  |  |  |  | 860 | 816 | 475
Total expenses |  |  |  |  |  |  |  |  |  |  |  | 1,150 | 1,120 | 836
Income before income tax benefit |  |  |  |  |  |  |  |  |  |  |  | 2,892 | 2,030 | 1,367
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | (386) | (378) | (283)
Income before equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 3,278 | 2,408 | 1,650
Equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 3,587 | 4,772 | 5,378
NET INCOME |  |  |  |  |  |  |  |  |  |  |  | 6,865 | 7,180 | 7,028
Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | $ 6,712 | $ 11,965 | $ (600)

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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