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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Change in Accounting Estimate [Line Items]    
Real Estate Acquired Through Foreclosure [1] $ 43,382 $ 16,237
Deposit Bases    
Change in Accounting Estimate [Line Items]    
Intangible assets, amortization period 10 years  
Minimum | Furniture and Fixtures    
Change in Accounting Estimate [Line Items]    
Useful life of premises and equipment 3 years  
Minimum | Building    
Change in Accounting Estimate [Line Items]    
Useful life of premises and equipment 7 years  
Maximum | Furniture and Fixtures    
Change in Accounting Estimate [Line Items]    
Useful life of premises and equipment 15 years  
Maximum | Building    
Change in Accounting Estimate [Line Items]    
Useful life of premises and equipment 45 years  
Non-Accruing | Minimum    
Change in Accounting Estimate [Line Items]    
Impaired commercial loans $ 1,000  
Undivided Profits    
Change in Accounting Estimate [Line Items]    
Adjustment to reflect adoption of ASU 2018-02 57,546 $ (230)
Accumulated Other Comprehensive Income/(Loss)    
Change in Accounting Estimate [Line Items]    
Adjustment to reflect adoption of ASU 2018-02 [2] (57,546)  
Accounting Standards Update 2018-02 | Undivided Profits    
Change in Accounting Estimate [Line Items]    
Adjustment to reflect adoption of ASU 2018-02 57,500  
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income/(Loss)    
Change in Accounting Estimate [Line Items]    
Adjustment to reflect adoption of ASU 2018-02 (57,500)  
Government Guaranteed Mortgage Loans upon Foreclosure Receivable    
Change in Accounting Estimate [Line Items]    
Real Estate Acquired Through Foreclosure $ 3,800  
[1] December 31, 2017 and 2016 include $6.3 million and $8.1 million, respectively, of foreclosed residential real estate.
[2] Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of Other comprehensive income/(loss) have been attributed solely to FHN as the controlling interest holder.