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Fair Value of Financial Instruments - Schedule of Changes in Fair Value Associated with Commercial Loans Held for Sale (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Change in fair value:
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag	Changes in valuation included in other noninterest income
Franklin Financial Network, Inc. | Commercial and industrial | Principal balance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value at beginning of period	$ 34,357
Change in fair value:
Paydowns and payoffs	(21,890)
Changes in valuation included in other noninterest income	0
Carrying value at end of period	12,467
Franklin Financial Network, Inc. | Commercial and industrial | Fair Value discount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value at beginning of period	(3,867)
Change in fair value:
Paydowns and payoffs	0
Changes in valuation included in other noninterest income	910
Carrying value at end of period	(2,957)
Franklin Financial Network, Inc. | Commercial and industrial |  Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Carrying value at beginning of period	30,490
Change in fair value:
Paydowns and payoffs	(21,890)
Changes in valuation included in other noninterest income	910
Carrying value at end of period	$ 9,510

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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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
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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.

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