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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Preferred Equity | Common Stock | Surplus | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 | $ 3,091,312 | $ 159,929 | $ 1,630 | $ 1,459,498 | $ 1,695,764 | $ (54,679) | $ (170,830)
Comprehensive income: |  |  |  |  |  |  |
Net income | 114,253 | 0 | 0 | 0 | 114,253 | 0 | 0
Other comprehensive income | (1,209) | 0 | 0 | 0 | 0 | 1,209 | 0
Comprehensive income | 115,462 |  |  |  |  |  |
Common stock issued: |  |  |  |  |  |  |
Stock-based compensation plans, net | 20,945 | 0 | 0 | 1,102 | (20,912) | 0 | 40,755
Purchase of treasury stock | (8,445) | 0 | 0 | 0 | 0 | 0 | (8,445)
Cash dividends: |  |  |  |  |  |  |
Common stock dividends ($0.12 per share in 2016 and $0.15 per share in 2017) | (36,804) | 0 | 0 | 0 | (36,804) | 0 | 0
Preferred stock dividends | (4,669) | 0 | 0 | 0 | (4,669) | 0 | 0
Stock-based compensation expense, net | 12,667 | 0 | 0 | 12,667 | 0 | 0 | 0
Other | 1,034 | 0 | 0 | 1,034 | 0 | 0 | 0
Ending balance at Jun. 30, 2017 | 3,191,502 | 159,929 | 1,630 | 1,474,301 | 1,747,632 | (53,470) | (138,520)
Beginning balance at Dec. 31, 2017 | 3,237,443 | 159,929 | 1,618 | 1,454,188 | 1,819,230 | (62,758) | (134,764)
Comprehensive income: |  |  |  |  |  |  |
Net income | 158,648 | 0 | 0 | 0 | 158,648 | 0 | 0
Other comprehensive income | 57,130 | 0 | 0 | 0 | 0 |  | 0
AOCI Loss Net of ASU Adoption and Tax | (43,392) |  |  |  |  | (43,392) |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (13,738) | 0 | 0 | 0 | 0 | (13,738) | 0
Comprehensive income | 101,518 |  |  |  |  |  |
Common stock issued: |  |  |  |  |  |  |
Stock-based compensation plans, net | 16,147 | 0 | 0 | 2,702 | (15,176) | 0 | 28,621
Stock Issued for Bank Mutual Acquisitions | 488,408 | 0 | 137 | 396,975 | 0 | 0 | 91,296
Purchase of common stock returned to authorized but unissued | (33,075) |  | (14) | (33,061) | 0 | 0 | 0
Purchase of treasury stock | (5,717) | 0 | 0 | 0 | 0 | 0 | (5,717)
Cash dividends: |  |  |  |  |  |  |
Common stock dividends ($0.12 per share in 2016 and $0.15 per share in 2017) | (51,817) | 0 | 0 | 0 | (51,817) | 0 | 0
Preferred stock dividends | (4,668) | 0 | 0 | 0 | (4,668) | 0 | 0
Preferred Stock Redemption Premium | (646) | (528) | 0 | 0 | (118) | 0 | 0
Proceeds from Warrant Exercises | 0 | 0 | 10 | (10) | 0 | 0 | 0
Stock-based compensation expense, net | 8,172 | 0 | 0 | 8,172 | 0 | 0 | 0
Tax Act Reclassification (2018-2) | 13,654 | 0 | 0 | 0 | 13,654 |  | 0
Change in Equity Securities(2016-01) | 84 | 0 | 0 | 0 | 84 |  | 0
Other | 742 | 0 | 0 | 0 | 742 | 0 | 0
Ending balance at Jun. 30, 2018 | $ 3,770,244 | $ 159,401 | $ 1,751 | $ 1,828,965 | $ 1,920,579 | $ (119,888) | $ (20,564)

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