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Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Expenses |  |  |
Interest expense | $ 291,747 | $ 454,835 | $ 195,892
Other expenses | 1,179,574 | 1,098,968 | 829,455
Net income, Before-tax Amount | 484,665 | 765,015 | 547,354
Net income | 373,695 | 563,780 | 428,476
Less: Preferred stock dividends | 33,163 | 22,881 | 17,998
Net income available to common shareholders | 340,532 | 540,899 | 410,478
Parent Company |  |  |
Income |  |  |
Cash dividends received from subsidiaries | 547,500 | 400,000 | 250,000
Cash distributions received from Synovus Bank | 0 | 0 | 10,000
Interest income | 3,341 | 5,920 | 1,703
Other income (loss) | 4,966 | 11,590 | (3,904)
Total income | 555,807 | 417,510 | 257,799
Expenses |  |  |
Interest expense | 42,911 | 41,328 | 25,287
Other expenses | 10,584 | 13,528 | 21,455
Total expenses | 53,495 | 54,856 | 46,742
Net income, Before-tax Amount | 502,312 | 362,654 | 211,057
Allocated income tax benefit | (12,202) | (9,753) | (13,690)
Income before equity in undistributed income of subsidiaries | 514,514 | 372,407 | 224,747
Equity in undistributed income (loss) of subsidiaries | (140,819) | 191,373 | 203,729
Net income | 373,695 | 563,780 | 428,476
Less: Preferred stock dividends | 33,163 | 22,881 | 17,998
Net income available to common shareholders | $ 340,532 | $ 540,899 | $ 410,478

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