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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Franklin Financial Network, Inc. | Commercial and industrial      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Additional gain recognized on pay-off related to amounts charged off prior to acquisition of portfolio   $ 6,274  
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 $ (5,133) 4,898 $ 3,228
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 (13,677) (16,976) 24,233
GNMA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Delinquent GNMA loans that had been previously sold 26,211 91,924  
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 (17,633) (33,284) $ 31,192
Level 3 | Non-recurring Basis      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Amortized costs of collateral dependent loans $ 3,054 $ 5,781