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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) |  |  |  |  |  |  |  |  | $ 0.64 |  |  |
Balance June 30, 2018 at Dec. 31, 2016 |  |  |  | 27,005,813 |  |  |  |  |  |  |  |
Balance June 30, 2017 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 loss |  | 1,378 |  |  |  |  |  |  |  |  | 1,378 |
Common dividend declared ($0.76 and $0.64 per share for 2018 and 2017, respectively) |  | (17,431) |  |  |  |  |  |  | (17,431) |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 369,286 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  |  |  | 11,174 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 8 |  |  | 0 |  |  | 8 |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 23,468 |  |  | 4 |  |  | 23,464 |  |  |  |
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) |  |  | 0 |  |  | (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 |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  | 0 |  |  |  |  |  |  |  |  |  |
Balance December 31, 2017 at Jun. 30, 2017 |  | 914,584 |  |  | 272 | (4,414) | 4,414 | 476,684 | 437,587 |  | 41 |
Balance December 31, 2016 at Jun. 30, 2017 |  |  |  | 27,431,171 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | [1] | 177 |  |  |  |  |  | 542 | $ (365) |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.76 |  |  |
Balance June 30, 2018 at Dec. 31, 2017 |  |  |  | 27,450,190 |  |  |  |  |  |  |  |
Balance June 30, 2017 at Dec. 31, 2017 |  | 943,809 |  |  | 273 | (4,590) | 4,590 | 479,430 | $ 465,937 |  | (1,831) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | 0 | [2] |  |  |  |  |  | 397 | [3] | (397) | [3]
Net income |  | 58,673 |  |  |  |  |  |  | 58,673 |  |  |
Other comprehensive loss |  | (7,055) |  |  |  |  |  |  |  |  | (7,055) |
Common dividend declared ($0.76 and $0.64 per share for 2018 and 2017, respectively) |  | (20,912) |  |  |  |  |  |  | (20,912) |  |  |
Proceeds from exercise of stock options, net of cash paid |  |  |  | 20,756 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 184 |  |  |  |  |  | 184 |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 0 |  |  |  |  |  |  |  |  |  |
Stock based compensation |  | 2,392 |  |  |  |  |  | 2,392 |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  | 43,217 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (1,338) |  |  | 1 |  |  | (1,339) |  |  |  |
Shares issued under direct stock purchase plan |  |  |  | 18,361 |  |  |  |  |  |  |  |
Shares issued under direct stock purchase plan |  | 1,312 |  |  |  |  |  | 1,312 |  |  |  |
Deferred compensation and other retirement benefit obligations |  |  |  |  |  | (63) | 63 |  |  |  |  |
Balance December 31, 2017 at Jun. 30, 2018 |  | 977,065 |  |  | $ 274 | $ (4,653) | $ 4,653 | 481,979 | 504,926 |  | (10,114) |
Balance December 31, 2016 at Jun. 30, 2018 |  |  |  | 27,532,524 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 0 | [3] |  |  |  |  | $ 0 | $ 831 | [2] | $ (831) | [2]
[1] | Represents adjustment needed to reflect the cumulative impact on retained earnings for previously recognized stock based compensation, which included an adjustment for estimated forfeitures. Pursuant to the Company's adoption of Accounting Standards Update 2016-09, the Company has elected to recognize stock based compensation without inclusion of a forfeiture estimate, and as such has recognized this adjustment to present retained earnings consistent with this election.
[2] | Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.
[3] | Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act (the "Tax Act"). Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.

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