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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Accounting Standards Update 2016-01 [Member] | [1] | Preferred Stock [Member] | Common Stock [Member] | Additional paid-in capital [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member] Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member] Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] Accounting Standards Update 2018-02 [Member] | Accumulated other comprehensive (loss) income [Member] | Accumulated other comprehensive (loss) income [Member] Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive (loss) income [Member] Accounting Standards Update 2016-01 [Member] | Accumulated other comprehensive (loss) income [Member] Accounting Standards Update 2018-02 [Member] | Treasury stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2017 |  |  | $ 0 | $ 204,569 | $ 367,717 | $ 1,698,613 | $ 1,723,632 | $ 0 | $ 0 | $ 30,726 | $ (5,707) | $ 20,170 | $ (4,849) | $ (30,726) | $ 5,707 | $ (578,112)
Dividend reinvestment plan |  |  |  | 47 | 1,379 |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance costs |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance costs |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase and compensation plans |  |  |  | 1,081 | 21,219 |  |  |  |  |  |  |  |  |  |  |
Net income | $ 178,939 |  |  |  |  | 178,939 |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Dividends to common stockholders |  |  |  |  |  | (44,157) |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (73,107) |  |  |  |  |  |  |  |  |  |  | (73,107) |  |  |  |
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,556)
End of year at Dec. 31, 2018 | $ 1,791,802 | $ (30,726) | $ 0 | 205,697 | 390,315 | 1,858,414 | 1,858,756 | 342 | 0 | 0 | 0 | (77,956) | (77,956) | 0 | 0 | (584,668)
Dividends declared per preferred share | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding, beginning of period at Dec. 31, 2017 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding, ending of period at Dec. 31, 2018 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares outstanding, beginning of period at Dec. 31, 2017 | 58,495,122 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan | 23,493 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase and compensation plan | 540,337 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of treasury stock | (110,398) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares outstanding, end of period at Dec. 31, 2018 | 58,948,554 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan |  |  |  | 44 | 1,510 |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance costs |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance costs |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase and compensation plans |  |  |  | 1,227 | 26,696 |  |  |  |  |  |  |  |  |  |  |
Net income | $ 271,623 |  |  |  |  | 271,623 |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Dividends to common stockholders |  |  |  |  |  | (49,850) |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 159,706 |  |  |  |  |  |  |  |  |  |  | 159,706 |  |  |  |
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,164)
End of year at Dec. 31, 2019 | $ 2,194,936 | 0 | $ 0 | 206,968 | 418,521 | 2,080,529 | $ 2,081,964 | $ 0 | $ 1,435 | $ 0 | $ 0 | 81,750 | $ 81,750 | $ 0 | $ 0 | (592,832)
Dividends declared per preferred share | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.83 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding, ending of period at Dec. 31, 2019 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan | 22,087 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase and compensation plan | 613,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of treasury stock | (123,166) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares outstanding, end of period at Dec. 31, 2019 | 59,461,153 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan |  |  |  | 58 | 1,645 |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance costs |  |  |  |  | (5,416) |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance costs |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase and compensation plans |  |  |  | 1,040 | 24,235 |  |  |  |  |  |  |  |  |  |  |
Net income | $ 246,355 |  |  |  |  | 246,355 |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Dividends to common stockholders |  |  |  |  |  | (56,782) |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 138,436 |  |  |  |  |  |  |  |  |  |  | 138,436 |  |  |  |
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,053)
End of year at Dec. 31, 2020 | $ 2,738,889 | $ 0 | $ 200,000 | $ 208,066 | $ 438,985 | $ 2,271,537 |  |  |  |  |  | $ 220,186 |  |  |  | $ (599,885)
Dividends declared per preferred share | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding, ending of period at Dec. 31, 2020 | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan | 28,890 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase and compensation plan | 519,863 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of treasury stock | (104,103) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares outstanding, end of period at Dec. 31, 2020 | 59,905,803 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Upon adoption of ASU 2016-01, we recognized a $30.7 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2018. Additionally, upon adoption of ASU 2018-02, we recognized a one-time reclassification from AOCI to retained earnings for $17.9 million representing the stranded tax assets related to our investment portfolio that were created in AOCI from the enactment of the Tax Cuts and Jobs Act of 2017.

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