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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Dividend reinvestment plan, shares |  |  |  |  | 63,349 | 90,110 | 100,383
Stock purchase and compensation plans, shares |  |  |  |  | 862,662 | 857,403 | 783,661
Dividends to stockholders, per share | $ 0.13 | [1] | $ 0.13 | [1] | $ 0.52 | $ 0.52 | $ 0.52
Acquisition of treasury stock, shares |  |  |  |  | 167,846 | 194,575 | 149,997
Preferred stock, par value per share | $ 0 |  | $ 0 |  | $ 0 | $ 0 | $ 0
Preferred stock, shares authorized | 5,000,000 |  | 5,000,000 |  | 5,000,000 | 5,000,000 | 5,000,000
Preferred stock, shares issued | 0 |  | 0 |  | 0 | 0 | 0
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, par value per share | $ 0 |  | $ 0 |  | $ 0 | $ 0 | $ 0
Preferred stock, shares authorized | 300,000 |  | 300,000 |  | 300,000 | 300,000 | 300,000
[1] | 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.

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