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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Franklin Financial Network, Inc. |  Fair Value | Commercial and industrial          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Gain recognized on the change in fair value of portfolio $ (8) $ (2,010) $ 902 $ (2,184)  
Mortgage Loans          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Net (losses) gains from fair value changes of mortgage loans held for sale recorded in income (129) 4,671 (179) (12,203)  
Loans HFS and derivatives          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Net (losses) gains from fair value changes of mortgage loans held for sale recorded in income 874 $ (5,354) 453 $ (12,902)  
Level 3 | Non-recurring Basis          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Amortized costs of collateral dependent loans $ 1,158   $ 1,158   $ 3,054