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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)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  | 27,450,190 |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  | $ 0 | [1] |  |  |  |  |  | $ 397 | [2] | $ (397) | [2]
Net income |  | 27,555 |  |  |  |  |  |  | 27,555 |  |  |
Other comprehensive income |  | (5,136) |  |  |  |  |  |  |  |  | (5,136) |
Common dividend declared |  | (10,454) |  |  |  |  |  |  | (10,454) |  |  |
Proceeds from exercise of stock options, net of cash paid |  |  |  | 19,256 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 143 |  |  | $ 0 |  |  | $ 143 |  |  |  |
Stock based compensation |  | 1,041 |  |  |  |  |  | 1,041 |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  | 36,961 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (1,318) |  |  | 0 |  |  | (1,318) |  |  |  |
Shares issued under direct stock purchase plan |  |  |  | 5,921 |  |  |  |  |  |  |  |
Shares issued under direct stock purchase plan |  | 419 |  |  |  |  |  | 419 |  |  |  |
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits |  |  |  |  |  | $ (1) | $ 1 |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  | 0 |  |  |  |  |  |  |  |  |  |
Period End Balance at Mar. 31, 2018 |  | 956,059 |  |  | 273 | (4,591) | 4,591 | 479,715 | $ 484,266 |  | (8,195) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  | (397) |
Net income |  | 58,673 |  |  |  |  |  |  |  |  |  |
Other comprehensive income |  | (7,055) |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.76 |  |  |
Period End Balance at Jun. 30, 2018 |  | 977,065 |  |  | 274 | (4,653) | 4,653 | 481,979 | $ 504,926 |  | (10,114) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 0 |  |  |  |  |  |  |  |  |  |
Period End Balance at Dec. 31, 2018 |  | 1,073,490 |  |  | 279 | (4,718) | 4,718 | 527,648 | 546,736 |  | (1,173) |
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] | 0 |  |  |  |  |  |  | 831 |  | (831) |
Common Stock, Shares, Outstanding |  |  |  | 27,512,328 |  |  |  |  |  |  |  |
Net income |  | 31,118 |  |  |  |  |  |  | $ 31,118 |  |  |
Other comprehensive income |  | (1,919) |  |  |  |  |  |  |  |  | (1,919) |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.38 |  |  |
Common dividend declared |  | (10,458) |  |  |  |  |  |  | $ (10,458) |  |  |
Proceeds from exercise of stock options, net of cash paid |  |  |  | 1,500 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 41 |  |  | 0 |  |  | 41 |  |  |  |
Stock based compensation |  | 1,351 |  |  |  |  |  | 1,351 |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  | 6,256 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (20) |  |  | 1 |  |  | (21) |  |  |  |
Shares issued under direct stock purchase plan |  |  |  | 12,440 |  |  |  |  |  |  |  |
Shares issued under direct stock purchase plan |  | 893 |  |  |  |  |  | 893 |  |  |  |
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits |  |  |  |  |  | (62) | 62 |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  | 0 |  |  |  |  |  |  |  |  |  |
Period End Balance at Jun. 30, 2018 |  | 977,065 |  |  | 274 | (4,653) | 4,653 | 481,979 | 504,926 |  | (10,114) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  | 27,532,524 |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  | 28,080,408 |  |  |  |  |  |  |  |
Net income |  | 35,225 |  |  |  |  |  |  | 35,225 |  |  |
Other comprehensive income |  | 8,054 |  |  |  |  |  |  |  |  | 8,054 |
Common dividend declared |  | (12,379) |  |  |  |  |  |  | (12,379) |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 0 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 0 |  |  | 0 |  |  | 0 |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  |  |  | 6,000 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 165 |  |  |  |  |  | 165 |  |  |  |
Stock based compensation |  | 915 |  |  |  |  |  | 915 |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  | 44,407 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (1,419) |  |  | 1 |  |  | (1,420) |  |  |  |
Shares issued under direct stock purchase plan |  |  |  | 6,689 |  |  |  |  |  |  |  |
Shares issued under direct stock purchase plan |  | 487 |  |  |  |  |  | 487 |  |  |  |
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits |  |  |  |  |  | 119 | (119) |  |  |  |  |
Increase (Decrease) in Deferred Compensation |  | 0 |  |  |  |  |  |  |  |  |  |
Period End Balance at Mar. 31, 2019 |  | 1,104,538 |  |  | 280 | (4,599) | 4,599 | 527,795 | $ 569,582 |  | 6,881 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 65,853 |  |  |  |  |  |  |  |  |  |
Other comprehensive income |  | 22,129 |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.88 |  |  |
Stock Issued During Period, Value, Acquisitions |  | 499,693 |  |  |  |  |  |  |  |  |  |
Period End Balance at Jun. 30, 2019 |  | 1,636,003 |  |  | 342 | (4,648) | 4,648 | 1,029,594 | $ 585,111 |  | 20,956 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  | 28,137,504 |  |  |  |  |  |  |  |
Net income |  | 30,628 |  |  |  |  |  |  | $ 30,628 |  |  |
Other comprehensive income |  | 14,075 |  |  |  |  |  |  |  |  | 14,075 |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.44 |  |  |
Common dividend declared |  | (15,099) |  |  |  |  |  |  | $ (15,099) |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 6,166,010 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | 499,693 |  |  | 61 |  |  | 499,632 |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  |  |  | 5,000 |  |  |  |  |  |  |  |
Proceeds from exercise of stock options, net of cash paid |  | 116 |  |  |  |  |  | 116 |  |  |  |
Stock based compensation |  | 1,517 |  |  |  |  |  | 1,517 |  |  |  |
Restricted stock awards issued, net of awards surrendered |  |  |  | 6,067 |  |  |  |  |  |  |  |
Restricted stock awards issued, net of awards surrendered |  | (12) |  |  | 1 |  |  | (13) |  |  |  |
Shares issued under direct stock purchase plan |  |  |  | 6,480 |  |  |  |  |  |  |  |
Shares issued under direct stock purchase plan |  | 547 |  |  |  |  |  | 547 |  |  |  |
Increase (Decrease) in Deferred Compensation and Other Retirement Benefits |  |  |  |  |  | (49) | 49 |  |  |  |  |
Period End Balance at Jun. 30, 2019 |  | $ 1,636,003 |  |  | $ 342 | $ (4,648) | $ 4,648 | $ 1,029,594 | $ 585,111 |  | $ 20,956 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  | 34,321,061 |  |  |  |  |  |  |  |
[1] | 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.
[2] | 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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