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Stock-Based Compensation - Summary of Vested and Unvested Restricted Stock Units Outstanding (Details) - $ / shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Aug. 15, 2020
Franklin Financial Network, Inc. |  |  |
Weighted Average Grant Date Fair Value |  |  |
Replacement awards issued to employees (in shares) |  |  | 118,776
Restricted Stock Units (RSUs) |  |  |
Restricted Stock Units Outstanding |  |  |
Restricted Stock Units Outstanding, Balance, beginning of period (in shares) | 826,263,000 | 1,140,215,000 |
Restricted Stock Units Outstanding, Grants (in shares) | 353,891,000 | 167,343,000 |
Restricted Stock Units Outstanding, Vested (in shares) | (145,157,000) | (270,959,000) |
Restricted Stock Units Outstanding, Forfeited (in shares) | (19,269,000) | (11,727,000) |
Restricted Stock Units Outstanding, Balance, end of period (in shares) | 1,015,728,000 | 1,024,872,000 |
Weighted Average Grant Date Fair Value |  |  |
Weighted Average Grant Date Fair Value, Balance, beginning of period (USD per share) | $ 23.76 | $ 21.96 |
Weighted Average Grant Date Fair Value, Grants (USD per share) | 31.12 | 34.05 |
Weighted Average Grant Date Fair Value, Vested (USD per share) | 31.67 | 24.00 |
Weighted Average Grant Date Fair Value, Forfeited (USD per share) | 33.19 | 24.56 |
Weighted Average Grant Date Fair Value, Balance, end of period (USD per share) | $ 25.83 | $ 23.67 |

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested and nonvested number. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested and nonvested weighted average grant date fair value. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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