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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock Outstanding [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock Outstanding [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 79,729,419 |  |  |  |  |
Beginning balance, loss, net of tax at Dec. 31, 2019 |  |  |  |  |  |  |  | $ 900,000 | $ 950,466,000 | $ 2,302,000 | $ 1,659,153,000 | $ (318,538,000) | $ 2,294,283,000
Dividend Reinvestment Plan (in shares) |  |  |  |  |  |  |  | 72,568 |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  |  | $ 1,000 | 1,705,000 | 0 | 0 | 0 | 1,706,000
Restricted stock units vested (in shares) |  |  |  |  |  |  |  | 186,887 |  |  |  |  |
Restricted stock units vested |  |  |  |  |  |  |  | $ 2,000 | 0 | 0 | 0 | 0 | 2,000
Shares withheld related to net share settlement of RSUs |  |  |  |  |  |  |  | 0 | (1,899,000) | 0 | 0 | 0 | (1,899,000)
Stock issued to directors |  |  |  |  |  |  |  | $ 0 | 800,000 | 0 | 0 | 0 | 800,000
Purchases of treasury stock (in shares) |  |  |  |  |  |  |  | (400,000) |  |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 0 | (12,880,000) | (12,880,000)
Stock-based compensation |  |  |  |  |  |  |  | 0 | 2,544,000 | 0 | 0 | 0 | 2,544,000
Cash dividends |  |  |  |  |  |  |  | 0 | 0 | 0 | (49,332,000) | 0 | (49,332,000)
Other comprehensive income (loss) |  |  |  |  |  |  |  | 0 | 0 | 6,051,000 | 0 | 0 | 6,051,000
Net income |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 101,173,000 | 0 | 101,173,000
Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 79,619,984 |  |  |  |  |
Ending balance, loss, net of tax at Jun. 30, 2020 |  |  |  |  |  |  |  | $ 903,000 | 953,616,000 | 8,353,000 | 1,710,994,000 | (331,418,000) | 2,342,448,000
Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  | 79,420,267 |  |  |  |  |
Beginning balance, loss, net of tax at Mar. 31, 2020 |  |  |  |  |  |  |  | $ 902,000 | 952,331,000 | 9,877,000 | 1,681,345,000 | (331,418,000) | 2,313,037,000
Dividend Reinvestment Plan (in shares) |  |  |  |  |  |  |  | 32,903 |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  |  | $ 0 | 860,000 | 0 | 0 | 0 | 860,000
Restricted stock units vested (in shares) |  |  |  |  |  |  |  | 135,704 |  |  |  |  |
Restricted stock units vested |  |  |  |  |  |  |  | $ 1,000 | 0 | 0 | 0 | 0 | 1,000
Shares withheld related to net share settlement of RSUs |  |  |  |  |  |  |  | $ 0 | (1,376,000) | 0 | 0 | 0 | (1,376,000)
Stock issued to directors (in shares) |  |  |  |  |  |  |  | 31,110 |  |  |  |  |
Stock issued to directors |  |  |  |  |  |  |  | $ 0 | 800,000 | 0 | 0 | 0 | 800,000
Stock-based compensation |  |  |  |  |  |  |  | 0 | 1,001,000 | 0 | 0 | 0 | 1,001,000
Cash dividends |  |  |  |  |  |  |  | 0 | 0 | 0 | (24,672,000) | 0 | (24,672,000)
Other comprehensive income (loss) |  |  |  |  |  |  |  | 0 | 0 | (1,524,000) | 0 | 0 | (1,524,000)
Net income |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 54,321,000 | 0 | 54,321,000
Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 79,619,984 |  |  |  |  |
Ending balance, loss, net of tax at Jun. 30, 2020 |  |  |  |  |  |  |  | $ 903,000 | 953,616,000 | 8,353,000 | 1,710,994,000 | (331,418,000) | 2,342,448,000
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  | 79,508,265 |  |  |  |  |
Beginning balance, loss, net of tax (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020 | [1] | $ 0 | $ 0 | $ 0 | $ (3,139) | $ 0 | $ (3,139) |  |  |  |  |  |
Beginning balance, loss, net of tax at Dec. 31, 2020 |  |  |  |  |  |  |  | $ 906,000 | 964,734,000 | 5,310,000 | 1,789,325,000 | (342,131,000) | 2,418,144,000
Dividend Reinvestment Plan (in shares) |  |  |  |  |  |  |  | 40,059 |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  |  | $ 1,000 | 1,724,000 | 0 | 0 | 0 | 1,725,000
Restricted stock units vested (in shares) |  |  |  |  |  |  |  | 121,922 |  |  |  |  |
Restricted stock units vested |  |  |  |  |  |  |  | $ 1,000 | 0 | 0 | 0 | 0 | 1,000
Shares withheld related to net share settlement of RSUs |  |  |  |  |  |  |  | $ 0 | (2,594,000) | 0 | 0 | 0 | (2,594,000)
Stock issued to directors (in shares) |  |  |  |  |  |  |  | 20,750 |  |  |  |  |
Stock issued to directors |  |  |  |  |  |  |  | $ 0 | 850,000 | 0 | 0 | 0 | $ 850,000
Purchases of treasury stock (in shares) |  |  |  |  |  |  |  | (1,532,406) |  |  |  |  | (1,532,406)
Purchases of treasury stock |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 0 | (63,529,000) | $ (63,529,000)
Stock-based compensation |  |  |  |  |  |  |  | 0 | 2,452,000 | 0 | 0 | 0 | 2,452,000
Cash dividends |  |  |  |  |  |  |  | 0 | 0 | 0 | (49,198,000) | 0 | (49,198,000)
Other comprehensive income (loss) |  |  |  |  |  |  |  | 0 | 0 | (2,938,000) | 0 | 0 | (2,938,000)
Net income |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 150,583,000 | 0 | 150,583,000
Balance (in shares) at Jun. 30, 2021 |  |  |  |  |  |  |  | 78,158,590 |  |  |  |  |
Ending balance, loss, net of tax at Jun. 30, 2021 |  |  |  |  |  |  |  | $ 908,000 | 967,166,000 | 2,372,000 | 1,887,571,000 | (405,660,000) | 2,452,357,000
Balance (in shares) at Mar. 31, 2021 |  |  |  |  |  |  |  | 79,595,025 |  |  |  |  |
Beginning balance, loss, net of tax at Mar. 31, 2021 | [2] |  |  |  |  |  |  | $ 907,000 | 965,566,000 | 1,686,000 | 1,834,920,000 | (342,131,000) | 2,460,948,000
Dividend Reinvestment Plan (in shares) |  |  |  |  |  |  |  | 20,023 |  |  |  |  |
Dividend Reinvestment Plan |  |  |  |  |  |  |  | $ 1,000 | 856,000 | 0 | 0 | 0 | 857,000
Restricted stock units vested (in shares) |  |  |  |  |  |  |  | 55,198 |  |  |  |  |
Restricted stock units vested |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 0 | 0 | 0
Shares withheld related to net share settlement of RSUs |  |  |  |  |  |  |  | $ 0 | (1,315,000) | 0 | 0 | 0 | (1,315,000)
Stock issued to directors (in shares) |  |  |  |  |  |  |  | 20,750 |  |  |  |  |
Stock issued to directors |  |  |  |  |  |  |  | $ 0 | 850,000 | 0 | 0 | 0 | 850,000
Purchases of treasury stock (in shares) |  |  |  |  |  |  |  | (1,532,406) |  |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 0 | (63,529,000) | (63,529,000)
Stock-based compensation |  |  |  |  |  |  |  | 0 | 1,209,000 | 0 | 0 | 0 | 1,209,000
Cash dividends |  |  |  |  |  |  |  | 0 | 0 | 0 | (24,548,000) | 0 | (24,548,000)
Other comprehensive income (loss) |  |  |  |  |  |  |  | 0 | 0 | 686,000 | 0 | 0 | 686,000
Net income |  |  |  |  |  |  |  | $ 0 | 0 | 0 | 77,199,000 | 0 | 77,199,000
Balance (in shares) at Jun. 30, 2021 |  |  |  |  |  |  |  | 78,158,590 |  |  |  |  |
Ending balance, loss, net of tax at Jun. 30, 2021 |  |  |  |  |  |  |  | $ 908,000 | $ 967,166,000 | $ 2,372,000 | $ 1,887,571,000 | $ (405,660,000) | $ 2,452,357,000
[1] | Balance sheet amounts previously reported for the impact of the initial adoption of CECL on January 1, 2021 have been corrected. The correction had an after-tax decrease to the cumulative effect of the change in accounting principle related to ASC 326 of $2.3 million.
[2] | Balance sheet amounts previously reported for the impact of the initial adoption of CECL on January 1, 2021 have been corrected. The correction had an after-tax decrease to the cumulative effect of the change in accounting principle related to ASC326 of $2.3 million.

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