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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, 2018
Dec. 31, 2017
Offsetting [Abstract]    
Gross amounts of recognized assets $ 687,437 $ 725,609
Gross amounts offset in the Statements of Condition 0 0
Net amounts of assets presented in the Statements of Condition 687,437 725,609
Gross amounts not offset in the Statements of Condition    
Offsetting securities sold under agreements to repurchase (1,017) (259)
Securities collateral (not recognized on FHN’s Statements of Condition) (681,110) (720,036)
Net amount $ 5,310 $ 5,314