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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 878,109 | $ 495,220 | $ 351,814 | $ 31,075
Beginning balance, shares at Dec. 31, 2014 |  | 105,893 |  |
Repurchase of common stock | (606) | $ (606) |  |
Repurchase of common stock, shares |  | (41) |  |
Exercise of stock options | 4,672 | $ 4,672 |  |
Exercise of stock options, shares |  | 411 |  |
Tax benefit from exercise of stock options | 772 | $ 772 |  |
Shares issued pursuant to stock-based compensation plan | 2,044 | $ 2,044 |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 92 |  |
Cash dividends declared on common stock | (38,274) |  | (38,274) |
Net earnings | 70,532 |  | 70,532 |
Other comprehensive income | 3,478 |  |  | 3,478
Ending balance at Sep. 30, 2015 | 920,727 | $ 502,102 | 384,072 | 34,553
Ending balance, shares at Sep. 30, 2015 |  | 106,355 |  |
Beginning balance at Dec. 31, 2015 | 923,399 | $ 502,571 | 399,919 | 20,909
Beginning balance, shares at Dec. 31, 2015 |  | 106,385 |  |
Repurchase of common stock | (496) | $ (496) |  |
Repurchase of common stock, shares |  | (66) |  |
Issuance of common stock for acquisition of County Commerce Bank | 21,642 | $ 21,642 |  |
Issuance of common stock for acquisition of County Commerce Bank, Shares |  | 1,394 |  |
Exercise of stock options | 3,174 | $ 3,174 |  |
Exercise of stock options, shares |  | 274 |  |
Tax benefit from exercise of stock options | 236 | $ 236 |  |
Shares issued pursuant to stock-based compensation plan | 2,154 | $ 2,154 |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 110 |  |
Cash dividends declared on common stock | (38,853) |  | (38,853) |
Net earnings | 74,353 |  | 74,353 |
Other comprehensive income | 17,694 |  |  | 17,694
Ending balance at Sep. 30, 2016 | $ 1,003,303 | $ 529,281 | $ 435,419 | $ 38,603
Ending balance, shares at Sep. 30, 2016 |  | 108,097 |  |

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