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Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Securities Purchased under Agreements to Resell [Abstract]    
Gross amounts of recognized assets $ 591,987 $ 586,629
Gross amounts offset in the Balance Sheets 0 0
Net amounts of assets presented in the Balance Sheets 591,987 586,629
Offsetting securities sold under agreements to repurchase (70) (21,004)
Securities collateral (not recognized on FHN’s Balance Sheets) (590,123) (562,702)
Net amount $ 1,794 $ 2,923