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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock Outstanding | Common Stock | Value of Shares Held in Rabbi Trust at Cost | Deferred Compensation and Other Retirement Benefit Obligations | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  | $ 0.29 |
Balance March 31, 2017 at Dec. 31, 2015 |  | 26,236,352 |  |  |  |  |  |
Balance March 31, 2016 at Dec. 31, 2015 | $ 771,463 |  | $ 260 | $ (3,958) | $ 3,958 | $ 405,486 | $ 368,169 | $ (2,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 18,611 |  |  |  |  |  | 18,611 |
Other comprehensive income | 4,264 |  |  |  |  |  |  | 4,264
Common dividend declared ($0.32 and $0.29 per share for 2017 and 2016, respectively) | (7,627) |  |  |  |  |  | (7,627) |
Proceeds from exercise of stock options, net of cash paid |  | 5,000 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 149 |  | 0 |  |  | 149 |  |
Tax benefit related to equity award activity | 235 |  |  |  |  | 235 |  |
Stock based compensation | 865 |  |  |  |  | 865 |  |
Restricted stock awards issued, net of awards surrendered |  | 36,887 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (671) |  | 1 |  |  | (672) |  |
Shares issued under direct stock purchase plan |  | 15,326 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 679 |  |  |  |  | 679 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (73) | 73 |  |  |
Increase (Decrease) in Deferred Compensation | 0 |  |  |  |  |  |  |
Tax benefit related to deferred compensation distributions | 179 |  |  |  |  | 179 |  |
Balance December 31, 2016 at Mar. 31, 2016 | 788,147 |  | 261 | (4,031) | 4,031 | 406,921 | $ 379,153 | 1,812
Balance December 31, 2015 at Mar. 31, 2016 |  | 26,293,565 |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  | $ 0.32 |
Balance March 31, 2017 at Dec. 31, 2016 |  | 27,005,813 |  |  |  |  |  |
Balance March 31, 2016 at Dec. 31, 2016 | 864,690 |  | 268 | (4,277) | 4,277 | 451,664 | $ 414,095 | (1,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 20,725 |  |  |  |  |  | 20,725 |
Other comprehensive income | 698 |  |  |  |  |  |  | 698
Common dividend declared ($0.32 and $0.29 per share for 2017 and 2016, respectively) | (8,653) |  |  |  |  |  | (8,653) |
Proceeds from exercise of stock options, net of cash paid |  | 7,688 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 143 |  |  |  |  | 143 |  |
Stock based compensation | 643 |  |  |  |  | 643 |  |
Restricted stock awards issued, net of awards surrendered |  | 27,534 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (1,336) |  | 1 |  |  | (1,337) |  |
Shares issued under direct stock purchase plan |  | 5,733 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 393 |  |  |  |  | 393 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (53) | 53 |  |  |
Balance December 31, 2016 at Mar. 31, 2017 | 877,480 |  | $ 269 | $ (4,330) | $ 4,330 | 452,048 | 425,802 | $ (639)
Balance December 31, 2015 at Mar. 31, 2017 |  | 27,046,768 |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 177 |  |  |  |  | $ 542 | $ (365) |

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