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Fair value of financial instruments - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percent of remaining principal allowed to buy back under GNMA optional repurchase programs 100.00%    
Franklin Financial Network, Inc. | Commercial and industrial      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Gain recognized on the change in fair value of portfolio $ 4,898    
Additional gain recognized on pay-off related to amounts charged off prior to acquisition of portfolio 6,274    
Level 3 | Non-recurring Basis      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Amortized costs of collateral dependent loans 2,255 $ 7,839  
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 (16,976) 24,233 $ (2,861)
GNMA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Delinquent GNMA loans that had been previously sold $ 94,648 $ 151,184