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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) |  |  |  |  |  |  | $ 0.58 |
Balance June 30, 2017 at Dec. 31, 2015 |  | 26,236,352 |  |  |  |  |  |
Balance June 30, 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 | 38,985 |  |  |  |  |  | 38,985 |
Other comprehensive income | 6,035 |  |  |  |  |  |  | 6,035
Common dividend declared ($0.32 and $0.29 per share for 2017 and 2016, respectively) | (15,256) |  |  |  |  |  | (15,256) |
Proceeds from exercise of stock options, net of cash paid |  | 6,652 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 144 |  | 0 |  |  | 144 |  |
Tax benefit related to equity award activity | 327 |  |  |  |  | 327 |  |
Stock based compensation | 1,633 |  |  |  |  | 1,633 |  |
Restricted stock awards issued, net of awards surrendered |  | 42,967 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (673) |  | 1 |  |  | (674) |  |
Shares issued under direct stock purchase plan |  | 23,916 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 1,060 |  |  |  |  | 1,060 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (155) | 155 |  |  |
Increase (Decrease) in Deferred Compensation | 0 |  |  |  |  |  |  |
Tax benefit related to deferred compensation distributions | 179 |  |  |  |  | 179 |  |
Balance December 31, 2016 at Jun. 30, 2016 | 803,897 |  | 261 | (4,113) | 4,113 | 408,155 | $ 391,898 | 3,583
Balance December 31, 2015 at Jun. 30, 2016 |  | 26,309,887 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | 0 |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  | $ 0.64 |
Balance June 30, 2017 at Dec. 31, 2016 |  | 27,005,813 |  |  |  |  |  |
Balance June 30, 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 | 41,288 |  |  |  |  |  | 41,288 |
Other comprehensive income | 1,378 |  |  |  |  |  |  | 1,378
Common dividend declared ($0.32 and $0.29 per share for 2017 and 2016, respectively) | (17,431) |  |  |  |  |  | (17,431) |
Proceeds from exercise of stock options, net of cash paid |  | 11,174 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 8 |  |  |  |  | 8 |  |
Stock based compensation | 1,560 |  |  |  |  | 1,560 |  |
Restricted stock awards issued, net of awards surrendered |  | 32,524 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (1,361) |  |  |  |  | (1,361) |  |
Shares issued under direct stock purchase plan |  | 12,374 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 807 |  |  |  |  | 807 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (137) | 137 |  |  |
Balance December 31, 2016 at Jun. 30, 2017 | 914,584 |  | 272 | $ (4,414) | $ 4,414 | 476,684 | 437,587 | $ 41
Balance December 31, 2015 at Jun. 30, 2017 |  | 27,431,171 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  | 369,286 |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | 23,468 |  | $ 4 |  |  | 23,464 |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 177 |  |  |  |  | $ 542 | $ (365) |

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