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Fair value of financial instruments - Changes in Fair Value Associated with Commercial Loans Held for Sale (Details) - Franklin Financial Network, Inc. - Commercial and industrial - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Carrying amount        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Carrying value at beginning of period $ 135,972 $ 0 $ 239,063 $ 0
Commercial loans held for sale acquired from Franklin   350,269   350,269
Change in fair value:        
Pay-downs and pay-offs (24,366) (86,808) (116,158) (86,808)
Write-offs to discount     (11,299)  
Changes in valuation included in other noninterest income 0 0 0
Carrying value at end of period 111,606 263,461 111,606 263,461
Fair Value Discount        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Carrying value at beginning of period (11,850) 0 (23,660) 0
Commercial loans held for sale acquired from Franklin   (24,063)   (24,063)
Change in fair value:        
Pay-downs and pay-offs 0 0 0 0
Write-offs to discount     11,299  
Changes in valuation included in other noninterest income 740 1,858 1,251 1,858
Carrying value at end of period (11,110) (22,205) (11,110) (22,205)
 Fair Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Carrying value at beginning of period 124,122 0 215,403 0
Commercial loans held for sale acquired from Franklin   326,206   326,206
Change in fair value:        
Pay-downs and pay-offs (24,366) (86,808) (116,158) (86,808)
Write-offs to discount     0  
Changes in valuation included in other noninterest income 740 1,858 1,251 1,858
Carrying value at end of period $ 100,496 $ 241,256 $ 100,496 $ 241,256