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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in-Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), net [Member] | Treasury Stock [Member] | Previously Reported [Member] | Previously Reported [Member] Common Stock [Member] | Previously Reported [Member] Additional Paid-in-Capital [Member] | Previously Reported [Member] Retained Earnings [Member] | Previously Reported [Member] Accumulated Other Comprehensive Income (Loss), net [Member] | Previously Reported [Member] Treasury Stock [Member] | Accounting Standards Update 2018-02 [Member] | Accounting Standards Update 2018-02 [Member] Common Stock [Member] | Accounting Standards Update 2018-02 [Member] Additional Paid-in-Capital [Member] | Accounting Standards Update 2018-02 [Member] Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member] Accumulated Other Comprehensive Income (Loss), net [Member] | Accounting Standards Update 2018-02 [Member] Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ (1,344) |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 1,344 | $ (1,344) |
Beginning balance at Dec. 31, 2017 | 888,127 | $ 113,915 | $ 470,123 | $ 437,416 | $ (6,173) | $ (127,154) |  |  |  |  |  |  | $ 888,127 | $ 113,915 | $ 470,123 | $ 438,760 | $ (7,517) | $ (127,154)
Beginning balance, Shares Outstanding at Dec. 31, 2017 |  | 97,456,478 |  |  |  |  |  |  |  |  |  |  |  | 97,456,478 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 107,498 |  |  | 107,498 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive (loss) Income | (3,824) |  |  |  | (3,824) |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | (34,849) |  |  | (34,849) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (26,189) |  |  |  |  | (26,189) |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  | (1,920,544) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock reissued | 44,026 |  | 21,579 | 0 |  | 22,447 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock reissued, Shares Outstanding |  | 2,908,234 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock, Shares Outstanding |  | 74,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | 600 | $ 0 | 571 | 0 |  | 29 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 975,389 | $ 113,915 | 492,273 | 511,409 | (11,341) | (130,867) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, Shares Outstanding at Dec. 31, 2018 |  | 98,518,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 105,333 |  |  | 105,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive (loss) Income | 16,920 |  |  |  | 16,920 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | (39,394) |  |  | (39,394) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (6,259) |  |  |  |  | (6,259) |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  | (486,849) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock reissued | 2,744 |  | 1,014 | 0 |  | 1,730 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock reissued, Shares Outstanding |  | 205,021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock, Shares Outstanding |  | 75,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | 932 | $ 0 | 450 | 0 |  | 482 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 1,055,665 |  |  |  |  |  | $ 1,055,665 | $ 113,915 | $ 493,737 | $ 577,348 | $ 5,579 | $ (134,914) |  |  |  |  |  |
Ending balance, Shares Outstanding at Dec. 31, 2019 | 98,311,840 |  |  |  |  |  |  | 98,311,840 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 73,447 |  |  | 73,447 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive (loss) Income | 11,654 |  |  |  | 11,654 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | (42,982) |  |  | (42,982) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired | (20,905) |  |  |  |  | (20,905) |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired |  | (2,430,842) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock reissued | 1,817 |  | 459 | 0 |  | 1,358 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock reissued, Shares Outstanding |  | 158,453 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock, Shares Outstanding |  | 91,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | 1,120 | $ 0 | 487 | 0 |  | 633 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,068,617 | $ 113,915 | $ 494,683 | 596,614 | $ 17,233 | $ (153,828) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, Shares Outstanding at Dec. 31, 2020 | 96,130,751 | 96,130,751 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 11,199 |  |  | $ 11,199 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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