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Fair Value of Financial Instruments - Schedule of Changes in Fair Value Associated with Commercial Loans Held for Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
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 | 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 | $ 12,232 | $ 34,357
Change in fair value: |  |
Paydowns and payoffs |  | (22,125)
Changes in valuation included in other noninterest income | 0 | 0
Carrying value at end of period | 12,232 | 12,232
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 | (2,965) | (3,867)
Change in fair value: |  |
Paydowns and payoffs |  | 0
Changes in valuation included in other noninterest income | (7) | 895
Carrying value at end of period | (2,972) | (2,972)
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 | 9,267 | 30,490
Change in fair value: |  |
Paydowns and payoffs |  | (22,125)
Changes in valuation included in other noninterest income | (7) | 895
Carrying value at end of period | $ 9,260 | $ 9,260

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