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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | County Commerce Bank [Member] | Valley Commerce Bancorp [Member] | Common Stock [Member] | Common Stock [Member] County Commerce Bank [Member] | Common Stock [Member] Valley Commerce Bancorp [Member] | Retained Earnings [Member] | Retained Earnings [Member] County Commerce Bank [Member] | Retained Earnings [Member] Valley Commerce Bancorp [Member] | Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income [Member] County Commerce Bank [Member] | Accumulated Other Comprehensive Income [Member] Valley Commerce Bancorp [Member]
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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) |  |  | 0 |  |  | 0 |  |
Repurchase of common stock, shares |  |  |  | (66) |  |  |  |  |  |  |  |
Issuance of common stock for acquisition |  | $ 21,642 |  |  | $ 21,642 |  |  | $ 0 |  |  | $ 0 |
Issuance of common stock for acquisition, shares |  |  |  |  | 1,394 |  |  |  |  |  |  |
Exercise of stock options | 3,174 |  |  | $ 3,174 |  |  | 0 |  |  | 0 |  |
Exercise of stock options, shares |  |  |  | 274 |  |  |  |  |  |  |  |
Tax benefit from exercise of stock options | 236 |  |  | $ 236 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to stock-based compensation plan | 2,154 |  |  | $ 2,154 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to stock-based compensation plan, shares |  |  |  | 110 |  |  |  |  |  |  |  |
Cash dividends declared on common stock | (38,853) |  |  | $ 0 |  |  | (38,853) |  |  | 0 |  |
Net earnings | 74,353 |  |  | 0 |  |  | 74,353 |  |  | 0 |  |
Other comprehensive income | 17,694 |  |  | 0 |  |  | 0 |  |  | 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 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2016 | 990,862 |  |  | $ 531,192 |  |  | 449,499 |  |  | 10,171 |  |
Beginning balance, shares at Dec. 31, 2016 |  |  |  | 108,252 |  |  |  |  |  |  |  |
Cumulative adjustment upon adoption of ASU 2016-09 | 50 |  |  | $ 116 |  |  | (66) |  |  | 0 |  |
Repurchase of common stock | (997) |  |  | $ (997) |  |  | 0 |  |  | 0 |  |
Repurchase of common stock, shares |  |  |  | (45) |  |  |  |  |  |  |  |
Issuance of common stock for acquisition |  |  | $ 37,637 |  |  | $ 37,637 |  |  | $ 0 |  |  | $ 0
Issuance of common stock for acquisition, shares |  |  |  |  |  | 1,634 |  |  |  |  |  |
Exercise of stock options | 2,537 |  |  | $ 2,537 |  |  | 0 |  |  | 0 |  |
Exercise of stock options, shares |  |  |  | 270 |  |  |  |  |  |  |  |
Shares issued pursuant to stock-based compensation plan | 2,200 |  |  | $ 2,200 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to stock-based compensation plan, shares |  |  |  | 46 |  |  |  |  |  |  |  |
Cash dividends declared on common stock | (44,058) |  |  | $ 0 |  |  | (44,058) |  |  | 0 |  |
Net earnings | 86,560 |  |  | 0 |  |  | 86,560 |  |  | 0 |  |
Other comprehensive income | 1,673 |  |  | 0 |  |  | 0 |  |  | 1,673 |  |
Ending balance at Sep. 30, 2017 | $ 1,076,464 |  |  | $ 572,685 |  |  | $ 491,935 |  |  | $ 11,844 |  |
Ending balance, shares at Sep. 30, 2017 |  |  |  | 110,157 |  |  |  |  |  |  |  |

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