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Share-based Compensation and Other Employment Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based Compensation, Allocation of Recognized Period Costs | Total share-based compensation expense recognized for 2020, 2019, and 2018 is presented in the following table by its classification within total non-interest expense.
| Years Ended December 31,
(in thousands) | 2020 |  | 2019 |  | 2018
Salaries and other personnel expense | $ | 17,827 |  |  | $ | 19,618 |  |  | $ | 15,712 |
Merger-related expense | — |  |  | 4,219 |  |  | — |
Other operating expenses | 814 |  |  | 650 |  |  | 931 |
Total share-based compensation expense included in non-interest expense | $ | 18,641 |  |  | $ | 24,487 |  |  | $ | 16,643 |
Schedule of Measuring Compensation Expense | The estimated fair value of the converted stock options was determined using a Hull-White model in a binomial lattice option pricing framework with the following weighted average assumptions:
| 2019
Stock price (Synovus' closing stock price on December 31, 2018) | $ | 31.99 |
Weighted average fair value of converted stock options | 11.50 |
Risk-free interest rate | 2.51 | %
Expected stock price volatility | 26.4 | %
Dividend yield | 3.13 | %
Term to expiration | 5.1 years
The fair value of market restricted share units granted was estimated on the date of grant using a Monte Carlo simulation model with the following weighted average assumptions:
|  | 2020 |  | 2019 |  | 2018
Risk-free interest rate |  | 1.42 | % |  | 2.40 | % |  | 2.32 | %
Expected stock price volatility |  | 25.4 |  |  | 24.4 |  |  | 22.5 |
Dividend yield |  | 3.6 |  |  | 2.9 |  |  | 1.3 |
Simulation period |  | 3.0 years |  | 3.0 years |  | 3.0 years
Schedule of Stock Options Activity | A summary of stock option activity and changes during the years ended December 31, 2020, 2019, and 2018 is presented below.
Stock Options |  |  |  |  |  |  |  |  |
| 2020 |  | 2019 |  | 2018
(in thousands, except per share data) | Quantity |  | Weighted-Average Exercise Price |  | Quantity |  | Weighted-Average Exercise Price |  | Quantity |  | Weighted-Average Exercise Price
Outstanding at beginning of year | 3,037 |  |  | $ | 22.74 |  |  | 640 |  |  | $ | 16.93 |  |  | 775 |  |  | $ | 17.85 |
Assumed in acquisition | — |  |  | — |  |  | 3,230 |  |  | 23.22 |  |  | — |  |  | — |
Options exercised | (572) |  |  | 22.67 |  |  | (820) |  |  | 19.91 |  |  | (126) |  |  | 16.92 |
Options forfeited/expired/canceled | (64) |  |  | 33.50 |  |  | (13) |  |  | 34.23 |  |  | (9) |  |  | 92.26 |
Options outstanding at end of year | 2,401 |  |  | $ | 22.47 |  |  | 3,037 |  |  | $ | 22.74 |  |  | 640 |  |  | $ | 16.93 |
Options exercisable at end of year | 2,401 |  |  | $ | 22.47 |  |  | 2,399 |  |  | $ | 19.52 |  |  | 640 |  |  | $ | 16.93 |
Schedule of Restricted Stock Units Activity | A summary of restricted share units, market restricted share units, and performance share units outstanding and changes during the years ended December 31, 2020, 2019, and 2018 is presented below.
|  | Restricted Share Units |  | Market Restricted Share Units |  | Performance Share Units
(in thousands, except per share data) |  | Quantity |  | Weighted-Average Grant Date Fair Value |  | Quantity |  | Weighted-Average Grant Date Fair Value |  | Quantity |  | Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2017 |  | 566 |  |  | $ | 33.25 |  |  | 171 |  |  | $ | 35.24 |  |  | 245 |  |  | $ | 31.54 |
Granted |  | 249 |  |  | 47.34 |  |  | 58 |  |  | 48.46 |  |  | 86 |  |  | 47.23 |
Dividend equivalents granted |  | 7 |  |  | 44.10 |  |  | 3 |  |  | 41.91 |  |  | 4 |  |  | 28.06 |
Quantity change by TSR factor |  | — |  |  | — |  |  | 18 |  |  | 33.21 |  |  | — |  |  | — |
Vested |  | (280) |  |  | 30.86 |  |  | (105) |  |  | 33.21 |  |  | (84) |  |  | 28.06 |
Adjustment for performance vs. target |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | 28.06 |
Forfeited |  | (16) |  |  | 38.60 |  |  | (1) |  |  | 38.32 |  |  | (2) |  |  | 33.52 |
Outstanding at December 31, 2018 |  | 526 |  |  | 41.18 |  |  | 144 |  |  | 41.91 |  |  | 248 |  |  | 38.29 |
Granted |  | 550 |  |  | 36.27 |  |  | 163 |  |  | 37.20 |  |  | 140 |  |  | 37.34 |
Assumed in acquisition |  | 136 |  |  | 31.99 |  |  | — |  |  | — |  |  | — |  |  | — |
Dividend equivalents granted |  | 23 |  |  | 36.27 |  |  | 6 |  |  | 37.20 |  |  | 9 |  |  | 37.34 |
Quantity change by TSR factor |  | — |  |  | — |  |  | (19) |  |  | 37.99 |  |  | — |  |  | — |
Vested |  | (304) |  |  | 37.04 |  |  | (59) |  |  | 37.99 |  |  | (93) |  |  | 26.35 |
Adjustment for performance vs. target |  | — |  |  | — |  |  | — |  |  | — |  |  | 6 |  |  | 37.34 |
Forfeited |  | (114) |  |  | 37.04 |  |  | (19) |  |  | 37.99 |  |  | (31) |  |  | 40.34 |
Outstanding at December 31, 2019 |  | 817 |  |  | 38.32 |  |  | 216 |  |  | 39.99 |  |  | 279 |  |  | 41.52 |
Granted |  | 763 |  |  | 32.42 |  |  | — |  |  | — |  |  | 131 |  |  | 35.75 |
Dividend equivalents granted |  | 59 |  |  | 32.42 |  |  | 9 |  |  | 39.99 |  |  | 23 |  |  | 41.52 |
Quantity change by TSR factor |  | — |  |  | — |  |  | 7 |  |  | 41.00 |  |  | — |  |  | — |
Vested |  | (384) |  |  | 38.04 |  |  | (104) |  |  | 41.00 |  |  | (110) |  |  | 41.61 |
Adjustment for performance vs. target |  | — |  |  | — |  |  | — |  |  | — |  |  | 34 |  |  | 41.61 |
Forfeited |  | (34) |  |  | 35.97 |  |  | (37) |  |  | 38.42 |  |  | (9) |  |  | 41.52 |
Outstanding at December 31, 2020 |  | 1,221 |  |  | $ | 34.50 |  |  | 91 |  |  | $ | 39.54 |  |  | 348 |  |  | $ | 39.33 |
Schedule of Grants Under All Synovus Equity Compensation Plans | The following table provides aggregate information regarding grants under all Synovus equity compensation plans at December 31, 2020.
Plan Category(1) |  | (a) Number of Securities to be Issued Upon Vesting of Restricted Share Units, Market Restricted Share Units, and Performance Share Units(2) |  | (b) Number of Securities to be Issued Upon Exercise of Outstanding Options |  | (c) Weighted-Average Exercise Price of Outstanding Options in Column (b) |  | (d) Number of Shares Remaining Available for Issuance Excluding Shares Reflected in Columns (a) and (b)
Shareholder approved equity compensation plans for shares of Synovus stock |  | 1,660 |  | 2,401 |  |  | $ | 22.47 |  |  | 1,522 |
(1) Does not include information for equity compensation plans assumed by Synovus in mergers. A total of 2.0 million shares of common stock was issuable upon exercise of options granted under plans assumed in mergers and outstanding at December 31, 2020. The weighted average exercise price of all options granted under plans assumed in mergers and outstanding at December 31, 2020 was $23.67. Synovus cannot grant additional awards under these assumed plans. (2) Market restricted and performance share units included at defined target levels. Actual shares issued upon vesting may differ based on actual TSR and ROAA and ROATCE (as defined) over the measurement period.

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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