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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) |  |  |  |  |  |  | $ 0.87 |
Balance September 30, 2017 at Dec. 31, 2015 |  | 26,236,352 |  |  |  |  |  |
Balance September 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 | 59,469 |  |  |  |  |  | 59,469 |
Other comprehensive income | 5,952 |  |  |  |  |  |  | 5,952
Common dividend declared ($0.32 and $0.29 per share for 2017 and 2016, respectively) | (22,888) |  |  |  |  |  | (22,888) |
Proceeds from exercise of stock options, net of cash paid |  | 9,022 |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid | 160 |  | 0 |  |  | 160 |  |
Tax benefit related to equity award activity | 354 |  |  |  |  | 354 |  |
Stock based compensation | 2,308 |  |  |  |  | 2,308 |  |
Restricted stock awards issued, net of awards surrendered |  | 32,567 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (673) |  | 1 |  |  | (674) |  |
Shares issued under direct stock purchase plan |  | 42,526 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 1,918 |  |  |  |  | 1,918 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (241) | 241 |  |  |
Increase (Decrease) in Deferred Compensation | 0 |  |  |  |  |  |  |
Tax benefit related to deferred compensation distributions | 179 |  |  |  |  | 179 |  |
Balance December 31, 2016 at Sep. 30, 2016 | 818,242 |  | 261 | (4,199) | 4,199 | 409,731 | $ 404,750 | 3,500
Balance December 31, 2015 at Sep. 30, 2016 |  | 26,320,467 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | 0 |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  | $ 0.96 |
Balance September 30, 2017 at Dec. 31, 2016 |  | 27,005,813 |  |  |  |  |  |
Balance September 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 | 65,140 |  |  |  |  |  | 65,140 |
Other comprehensive income | 1,753 |  |  |  |  |  |  | 1,753
Common dividend declared ($0.32 and $0.29 per share for 2017 and 2016, respectively) | (26,212) |  |  |  |  |  | (26,212) |
Proceeds from exercise of stock options, net of cash paid |  | 11,590 |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | (5) |  |  |  |  | (5) |  |
Stock based compensation | 2,346 |  |  |  |  | 2,346 |  |
Restricted stock awards issued, net of awards surrendered |  | 32,476 |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered | (1,363) |  | 1 |  |  | (1,364) |  |
Shares issued under direct stock purchase plan |  | 18,626 |  |  |  |  |  |
Shares issued under direct stock purchase plan | 1,230 |  |  |  |  | 1,230 |  |
Deferred compensation and other retirement benefit obligations |  |  |  | (228) | 228 |  |  |
Balance December 31, 2016 at Sep. 30, 2017 | 931,224 |  | 273 | $ (4,505) | $ 4,505 | 477,877 | 452,658 | $ 416
Balance December 31, 2015 at Sep. 30, 2017 |  | 27,437,791 |  |  |  |  |  |
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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