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Fair Value of Financial Instruments - Changes in Fair Value Associated with Commercial Loans Held for Sale (Details) - Franklin Financial Network, Inc. - Commercial and industrial - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Aggregate Unpaid Principal Balance |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Carrying value at beginning of period | $ 86,762 | $ 239,063
Change in fair value: |  |
Pay-downs and pay-offs | (946) | (39,566)
Write-offs to discount | 0 | (2,007)
Changes in valuation included in other noninterest income | 0 | 0
Carrying value at end of period | 85,816 | 197,490
Fair Value Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Carrying value at beginning of period | (7,463) | (23,660)
Change in fair value: |  |
Pay-downs and pay-offs | 0 | 0
Write-offs to discount | 0 | 2,007
Changes in valuation included in other noninterest income | (174) | (853)
Carrying value at end of period | (7,637) | (22,506)
Fair Value |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Carrying value at beginning of period | 79,299 | 215,403
Change in fair value: |  |
Pay-downs and pay-offs | (946) | (39,566)
Write-offs to discount | 0 | 0
Changes in valuation included in other noninterest income | (174) | (853)
Carrying value at end of period | $ 78,179 | $ 174,984

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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