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Business Segment Information (Amounts Of Consolidated Revenue, Expense, Tax And Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  | $ 200,701 | $ 176,264 | $ 390,409 | $ 348,338
Provision/(provision credit) for loan losses |  | (2,000) | 4,000 | (3,000) | 7,000
Noninterest income |  | 127,673 | 145,514 | 244,612 | 279,819
Noninterest expense |  | 217,917 | 226,822 | 440,122 | 453,749
Income/(loss) before income taxes |  | 112,457 | 90,956 | 197,899 | 167,408
Provision/(benefit) for income taxes | [1] | 17,253 | 30,016 | 44,307 | 54,255
Net income/(loss) |  | 95,204 | 60,940 | 153,592 | 113,153
Average assets |  | 28,876,350 | 26,828,548 | 28,841,422 | 26,723,621
Regional Banking |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  | 201,997 | 178,318 | 395,386 | 350,627
Provision/(provision credit) for loan losses |  | 260 | 10,883 | 3,358 | 25,651
Noninterest income |  | 64,737 | 61,275 | 123,713 | 120,551
Noninterest expense |  | 152,659 | 164,524 | 300,723 | 309,920
Income/(loss) before income taxes |  | 113,815 | 64,186 | 215,018 | 135,607
Provision/(benefit) for income taxes |  | 41,136 | 22,333 | 77,724 | 47,709
Net income/(loss) |  | 72,679 | 41,853 | 137,294 | 87,898
Average assets |  | 18,431,757 | 16,575,643 | 18,194,854 | 16,260,417
Fixed Income |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  | 4,979 | 3,146 | 6,130 | 5,813
Noninterest income |  | 55,205 | 78,083 | 106,027 | 145,205
Noninterest expense |  | 54,001 | 62,802 | 102,686 | 121,427
Income/(loss) before income taxes |  | 6,183 | 18,427 | 9,471 | 29,591
Provision/(benefit) for income taxes |  | 1,946 | 6,785 | 2,970 | 10,677
Net income/(loss) |  | 4,237 | 11,642 | 6,501 | 18,914
Average assets |  | 2,696,430 | 2,470,724 | 2,288,336 | 2,370,201
Corporate Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  | (14,995) | (15,847) | (29,095) | (30,208)
Noninterest income |  | 6,218 | 4,909 | 11,694 | 10,632
Noninterest expense |  | 24,563 | 15,930 | 41,443 | 29,391
Income/(loss) before income taxes |  | (33,340) | (26,868) | (58,844) | (48,967)
Provision/(benefit) for income taxes | [1] | (35,711) | (12,744) | (48,769) | (23,959)
Net income/(loss) |  | 2,371 | (14,124) | (10,075) | (25,008)
Average assets |  | 6,226,743 | 5,833,303 | 6,789,751 | 6,097,764
Non Strategic |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest income |  | 8,720 | 10,647 | 17,988 | 22,106
Provision/(provision credit) for loan losses |  | (2,260) | (6,883) | (6,358) | (18,651)
Noninterest income |  | 1,513 | 1,247 | 3,178 | 3,431
Noninterest expense |  | (13,306) | (16,434) | (4,730) | (6,989)
Income/(loss) before income taxes |  | 25,799 | 35,211 | 32,254 | 51,177
Provision/(benefit) for income taxes |  | 9,882 | 13,642 | 12,382 | 19,828
Net income/(loss) |  | 15,917 | 21,569 | 19,872 | 31,349
Average assets |  | $ 1,521,420 | $ 1,948,878 | $ 1,568,481 | $ 1,995,239
[1] | Provision/(benefit) for income taxes for consolidated results and the Corporate segment for the three and six months ended June 30, 2017, relative to the prior year periods, was affected by a decline in the effective tax rate in 2017 primarily related to the reversal of the valuation allowance for the deferred tax asset related to its 2012 federal capital loss carryforward based on capital gain transactions initiated in second quarter 2017. See Note 15 – Income Taxes in the Notes to Consolidated Financial Statements on FHN’s Form 10-K for the year ended December 31, 2016, for additional information.

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