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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 | (497) | $ (497) |  |
Repurchase of common stock, shares |  | (32) |  |
Exercise of stock options | 3,313 | $ 3,313 |  |
Exercise of stock options, shares |  | 306 |  |
Tax benefit from exercise of stock options | 614 | $ 614 |  |
Shares issued pursuant to stock-based compensation plan | 732 | $ 732 |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 80 |  |
Cash dividends declared on common stock | (12,742) |  | (12,742) |
Net earnings | 15,833 |  | 15,833 |
Other comprehensive income (loss) | 11,756 |  |  | 11,756
Ending balance at Mar. 31, 2015 | 897,118 | $ 499,382 | 354,905 | 42,831
Ending balance, shares at Mar. 31, 2015 |  | 106,247 |  |
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 | (392) | $ (392) |  |
Repurchase of common stock, shares |  | (31) |  |
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 | 285 | $ 285 |  |
Exercise of stock options, shares |  | 25 |  |
Tax benefit from exercise of stock options | 0 |  |  |
Shares issued pursuant to stock-based compensation plan | 654 | $ 654 |  |
Shares issued pursuant to stock-based compensation plan, shares |  | 13 |  |
Cash dividends declared on common stock | (12,934) |  | (12,934) |
Net earnings | 23,391 |  | 23,391 |
Other comprehensive income (loss) | 15,817 |  |  | 15,817
Ending balance at Mar. 31, 2016 | $ 971,862 | $ 524,760 | $ 410,376 | $ 36,726
Ending balance, shares at Mar. 31, 2016 |  | 107,786 |  |

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