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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss)/Income | Reclassifications Related to Funded Status of Pension | Reclassifications Related to Unrealized Gains on Available for Sale Securities | Treasury Stock | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjustment Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment Accumulated Other Comprehensive (Loss)/Income | [1]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 884,031 | $ 90,326 | $ 216,106 | $ 628,107 |  | $ (18,427) |  |  |  | $ (32,081) |  |  |  |
Beginning balance (ASU No. 2016-01) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 862 | [1] | $ (862)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 105,334 |  |  | 105,334 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (391) |  |  |  |  | (391) |  |  |  |  |  |  |  |
Reclassification of tax effects from the Tax Act | 0 |  |  | 3,427 | [2] | (3,427) | [2] |  |  |  |  |  |  |
Reclassification of tax effects from the Tax Act | ASU No. 2018-02 |  |  |  |  |  |  |  | $ (3,660) | $ 233 |  |  |  |  |
Repurchase of warrant | (7,652) |  | (7,652) |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | (34,539) |  |  | (34,539) |  |  |  |  |  |  |  |  |  |
Treasury stock repurchased | (12,256) |  |  |  |  |  |  |  |  | (12,256) |  |  |  |
Treasury stock issued | (657) |  |  | (1,372) |  |  |  |  |  | 715 |  |  |  |
Recognition of restricted stock compensation expense | 1,891 |  | 1,891 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 935,761 | 90,326 | 210,345 | 701,819 |  | (23,107) |  |  |  | (43,622) | 167 | 167 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 98,234 |  |  | 98,234 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 11,437 |  |  |  |  | 11,437 |  |  |  |  |  |  |  |
Cash dividends declared | (37,360) |  |  | (37,360) |  |  |  |  |  |  |  |  |  |
Common stock issuance cost | (176) |  | (176) |  |  |  |  |  |  |  |  |  |  |
Common stock issued in acquisition | 200,631 | 13,297 | 187,334 |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchased | (18,222) |  |  |  |  |  |  |  |  | (18,222) |  |  |  |
Treasury stock issued | (915) |  |  | (1,777) |  |  |  |  |  | 862 |  |  |  |
Recognition of restricted stock compensation expense | 2,441 |  | 2,441 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 1,191,998 | 103,623 | 399,944 | 761,083 |  | (11,670) |  |  |  | (60,982) | $ (22,590) | $ (22,590) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 21,040 |  |  | 21,040 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | 20,641 |  |  |  |  | 20,641 |  |  |  |  |  |  |  |
Cash dividends declared | (43,949) |  |  | (43,949) |  |  |  |  |  |  |  |  |  |
Treasury stock repurchased | (12,559) |  |  |  |  |  |  |  |  | (12,559) |  |  |  |
Treasury stock issued | (594) |  |  | (5,523) |  |  |  |  |  | 4,929 |  |  |  |
Recognition of restricted stock compensation expense | 724 |  | 724 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,154,711 | $ 103,623 | $ 400,668 | $ 710,061 |  | $ 8,971 |  |  |  | $ (68,612) |  |  |  |
[1] | Reclassification due to the adoption of ASU No. 2016-01, related to changes in fair value for equity securities reclassified out of accumulated other comprehensive income.
[2] | Reclassification of tax effects due to the adoption of ASU No. 2018-02, relating to $(3,660) relates to funded status of pension and $233 relates to net unrealized gains on available-for-sale securities.

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