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Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividends on perferred stock (in dollars per share) | $ 150 | $ 400 | $ 398
Dividends on common stock (in dollars per share) | $ 0.62 | $ 0.59 | $ 0.55
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares) | 50,446 | 59,717 | 61,308
Issuance of common shares pursuant to the Deferred Compensation Plan (in shares) | 4,683 | 6,153 | 13,724
Issuance of common shares pursuant to the First Retirement & Savings Plan (in shares) | 558 | 11,885 | 8,971
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan (in shares) | 2,910 | 3,281 | 8,789
Stock issued during period, new issue (in shares) | 2,600,616 |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 1,355,319 |  | 1,139,426
number of preferred shares converted to common shares | 5,500 |  | 4,927
Purchase of treasury shares (in shares) | 0 | 53,246 | 86,681
Issuance of common shares pursuant to the exercise of stock options (in shares) | 2,500 | 0 | 0
Treasury Stock, Shares, Retired | 0 | 0 | 1,500,000
Common Stock |  |  |
Stock issued during period, new issue (in shares) |  | 1,392,859 |

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