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Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Common Stock Southeastern Bank Financial | Common Stock Park Sterling Corporation | Common Stock | Surplus Southeastern Bank Financial | Surplus Park Sterling Corporation | Surplus | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Southeastern Bank Financial | Park Sterling Corporation | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 |  |  | $ 60,576 |  |  | $ 711,307 | $ 370,916 | $ (8,211) |  |  | $ 1,134,588
Balance (in shares) at Dec. 31, 2016 |  |  | 24,230,392 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 87,554 |  |  |  | 87,554
Other comprehensive income (loss), net of tax effects |  |  |  |  |  |  |  | (2,216) |  |  | (2,216)
Comprehensive income |  |  |  |  |  |  |  |  |  |  | 85,338
Cash dividends declared on common stock per share |  |  |  |  |  |  | (38,623) |  |  |  | (38,623)
Employee stock purchases |  |  | $ 32 |  |  | 1,023 |  |  |  |  | 1,055
Employee stock purchases (in shares) |  |  | 12,798 |  |  |  |  |  |  |  |
Stock options exercised |  |  | $ 149 |  |  | 1,816 |  |  |  |  | 1,965
Stock options exercised (in shares) |  |  | 59,480 |  |  |  |  |  |  |  |
Restricted stock awards |  |  | $ 53 |  |  | (53) |  |  |  |  |
Restricted stock awards (in shares) |  |  | 21,628 |  |  |  |  |  |  |  |
Stock issued pursuant to restricted stock units |  |  | $ 95 |  |  | (95) |  |  |  |  |
Stock issued pursuant to restricted stock units (in shares) |  |  | 37,802 |  |  |  |  |  |  |  |
Common stock issued for acquisition | $ 12,446 | $ 18,701 |  | $ 422,163 | $ 669,865 |  |  |  | $ 434,609 | $ 688,566 |
Common stock issued for acquisition (in shares) | (4,978,338) | (7,480,343) |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | $ (153) |  |  | (5,359) |  |  |  |  | (5,512)
Common stock repurchased (in shares) |  |  | (61,125) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | 6,934 |  |  |  |  | 6,934
Balance at Dec. 31, 2017 |  |  | $ 91,899 |  |  | 1,807,601 | 419,847 | (10,427) |  |  | 2,308,920
Balance (in shares) at Dec. 31, 2017 |  |  | 36,759,656 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 178,871 |  |  |  | 178,871
Other comprehensive income (loss), net of tax effects |  |  |  |  |  |  |  | (11,507) |  |  | (11,507)
Comprehensive income |  |  |  |  |  |  |  |  |  |  | 167,364
Cash dividends declared on common stock per share |  |  |  |  |  |  | (50,557) |  |  |  | (50,557)
AOCI reclassification to retained earnings from adoption of ASU 2018-02 |  |  |  |  |  |  | 2,947 | (2,947) |  |  | (2,947)
Employee stock purchases |  |  | $ 45 |  |  | 1,286 |  |  |  |  | 1,331
Employee stock purchases (in shares) |  |  | 18,110 |  |  |  |  |  |  |  |
Stock options exercised |  |  | $ 84 |  |  | 948 |  |  |  |  | 1,032
Stock options exercised (in shares) |  |  | 33,424 |  |  |  |  |  |  |  |
Restricted stock awards |  |  | $ 10 |  |  | (10) |  |  |  |  |
Restricted stock awards (in shares) |  |  | 4,069 |  |  |  |  |  |  |  |
Stock issued pursuant to restricted stock units |  |  | $ 99 |  |  | (99) |  |  |  |  |
Stock issued pursuant to restricted stock units (in shares) |  |  | 39,541 |  |  |  |  |  |  |  |
Common stock repurchased - buyback plan |  |  | $ (2,500) |  |  | (65,904) |  |  |  |  | (68,404)
Common stock repurchased - buyback plan (in shares) |  |  | (1,000,000) |  |  |  |  |  |  |  |
Common stock repurchased |  |  | $ (63) |  |  | (2,110) |  |  |  |  | (2,173)
Common stock repurchased (in shares) |  |  | (25,251) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | 8,783 |  |  |  |  | 8,783
Balance at Dec. 31, 2018 |  |  | $ 89,574 |  |  | 1,750,495 | 551,108 | (24,881) |  |  | $ 2,366,296
Balance (in shares) at Dec. 31, 2018 |  |  | 35,829,549 |  |  |  |  |  |  |  | 35,829,549
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | 186,483 |  |  |  | $ 186,483
Other comprehensive income (loss), net of tax effects |  |  |  |  |  |  |  | 25,898 |  |  | 25,898
Comprehensive income |  |  |  |  |  |  |  |  |  |  | 212,381
Cash dividends declared on common stock per share |  |  |  |  |  |  | (57,696) |  |  |  | (57,696)
Employee stock purchases |  |  | $ 53 |  |  | 1,341 |  |  |  |  | 1,394
Employee stock purchases (in shares) |  |  | 21,100 |  |  |  |  |  |  |  |
Stock options exercised |  |  | $ 92 |  |  | 1,138 |  |  |  |  | 1,230
Stock options exercised (in shares) |  |  | 36,978 |  |  |  |  |  |  |  |
Restricted stock awards |  |  | $ 15 |  |  | (15) |  |  |  |  |
Restricted stock awards (in shares) |  |  | 5,889 |  |  |  |  |  |  |  |
Stock issued pursuant to restricted stock units |  |  | $ 129 |  |  | (129) |  |  |  |  |
Stock issued pursuant to restricted stock units (in shares) |  |  | 51,543 |  |  |  |  |  |  |  |
Common stock repurchased - buyback plan |  |  | $ (5,413) |  |  | (151,532) |  |  |  |  | (156,945)
Common stock repurchased - buyback plan (in shares) |  |  | (2,165,000) |  |  |  |  |  |  |  |
Common stock repurchased |  |  | $ (89) |  |  | (2,397) |  |  |  |  | (2,486)
Common stock repurchased (in shares) |  |  | (35,674) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | 8,839 |  |  |  |  | 8,839
Balance at Dec. 31, 2019 |  |  | $ 84,361 |  |  | $ 1,607,740 | $ 679,895 | $ 1,017 |  |  | $ 2,373,013
Balance (in shares) at Dec. 31, 2019 |  |  | 33,744,385 |  |  |  |  |  |  |  | 33,744,385

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