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Condensed Financial Information of Synovus Financial Corp. (Parent Company only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Activities |  |  |
Net income (loss) | $ 543,705 | $ 757,902 | $ 760,467
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Other | (7,329) | 677 | 0
Net cash provided by (used in) operating activities | 1,282,623 | 1,191,489 | 794,016
Investing Activities |  |  |
Net cash provided by (used in) investing activities | 323,966 | (4,855,482) | (4,384,166)
Financing Activities |  |  |
Repurchase of common stock | 0 | (12,987) | (199,932)
Repayments and redemption of long-term debt | (5,404,731) | (700,000) | 0
Proceeds from long-term debt, net | 3,220,912 | 3,622,892 | 0
Other | 0 | 0 | (1,104)
Net cash provided by (used in) financing activities | (1,132,943) | 2,631,920 | 2,347,086
Increase (decrease) in cash and cash equivalents including restricted cash | 473,646 | (1,032,073) | (1,243,064)
Cash, cash equivalents, and restricted cash at beginning of year | 1,977,780 | 3,009,853 | 4,252,917
Cash, cash equivalents, and restricted cash at end of year | 2,451,426 | 1,977,780 | 3,009,853
Parent Company |  |  |
Operating Activities |  |  |
Net income (loss) | 543,705 | 757,902 | 760,467
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Equity in undistributed (income) loss of subsidiaries | (141,994) | (448,555) | (368,702)
Deferred income tax expense (benefit) | 433 | 143 | (7,296)
Net increase (decrease) in other liabilities | 4,849 | 3,233 | (2,082)
Net (increase) decrease in other assets | (4,676) | 8,022 | 5,280
Other | 1,616 | 825 | 928
Net cash provided by (used in) operating activities | 403,933 | 321,570 | 388,595
Investing Activities |  |  |
Increase in other investments | (774) | (1,027) | (10,000)
Net cash provided by (used in) investing activities | (774) | (1,027) | (10,000)
Financing Activities |  |  |
Dividends paid to common and preferred shareholders | (252,011) | (229,311) | (227,840)
Repurchase of common stock | 0 | (12,987) | (199,932)
Repayments and redemption of long-term debt | (97,033) | (300,000) | 0
Proceeds from long-term debt, net | 0 | 347,892 | 0
Other | 0 | 0 | (1,104)
Net cash provided by (used in) financing activities | (349,044) | (194,406) | (428,876)
Increase (decrease) in cash and cash equivalents including restricted cash | 54,115 | 126,137 | (50,281)
Cash, cash equivalents, and restricted cash at beginning of year | 524,485 | 398,348 | 448,629
Cash, cash equivalents, and restricted cash at end of year | $ 578,600 | $ 524,485 | $ 398,348

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