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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY (Parenthetical) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common stock issuance, net of offering cost (in shares) | 360,815 |  |  |
Common stock, issuance cost (in Dollars) |  |  |  | $ 139
Cash dividends (in dollars per share) |  | $ 1.07 | $ 1.04 | $ 1.04
Common Stock [Member] |  |  |  |
Common stock issuance, net of offering cost (in shares) |  | 585 | 400 |
Dividend reinvestment and purchase plan (in shares) |  | 20,393 | 19,791 | 25,751
Cash dividends (in dollars per share) |  |  | $ 1.04 | $ 1.04
Retained Earnings [Member] |  |  |  |
Cash dividends (in dollars per share) | $ 0.81 |  |  |
Treasury Stock [Member] |  |  |  |
Dividend reinvestment and purchase plan (in shares) | 11,712 |  |  |
Purchase of treasury stock (in Shares) |  | 196,635 |  |

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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