XML 66 R53.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans (Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade) (Details) $ in Thousands | Sep. 30, 2017 USD ($) grade | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) grade | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance | $ 194,867 | $ 197,257 | $ 202,068 |  | $ 201,557 | $ 199,807 | $ 210,242
Total loans collectively evaluated for impairment | 19,885,440 |  |  |  | 19,192,515 |  |
Total loans individually evaluated for impairment | 254,831 |  |  |  | 305,973 |  |
Purchase credit impaired loans - recorded investment | 25,820 |  |  |  | 57,299 |  |
Allowance - collectively evaluated for impairment | 147,928 |  |  |  | 150,777 |  |
Allowance - individually evaluated for impairment | 43,804 |  |  |  | 49,614 |  |
Allowance - purchased credit impaired loans | $ 3,135 |  | $ 700 |  | $ 1,166 |  |
Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percent of total commercial loans (percent) | 100.00% |  | 100.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 127,888 |  | $ 123,250 |  |  |  |
Total loans collectively evaluated for impairment | 14,983,986 |  | 14,187,074 |  |  |  |
Total loans individually evaluated for impairment | 34,348 |  | 51,086 |  |  |  |
Purchase credit impaired loans - recorded investment | 24,525 |  | 45,450 |  |  |  |
Total commercial loans | $ 15,042,859 |  | $ 14,283,610 |  |  |  |
Percent of loan collectively evaluated for impairment (percent) | 99.00% |  | 99.00% |  |  |  |
Percent of loan individually evaluated for impairment (percent) | 1.00% |  | 1.00% |  |  |  |
Percent of loan purchased-credit impaired (percent) | 0.00% |  | 0.00% |  |  |  |
Allowance - collectively evaluated for impairment | $ 118,086 |  | $ 118,518 |  |  |  |
Allowance - individually evaluated for impairment | 7,021 |  | 4,413 |  |  |  |
Allowance - purchased credit impaired loans | 2,781 |  | 319 |  |  |  |
General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans collectively evaluated for impairment | 10,468,700 |  | 9,710,168 |  |  |  |
Total loans individually evaluated for impairment | 28,931 |  | 44,753 |  |  |  |
Purchase credit impaired loans - recorded investment | 20,725 |  | 40,532 |  |  |  |
Total commercial loans | 10,518,356 |  | 9,795,453 |  |  |  |
Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans collectively evaluated for impairment | 1,966,155 |  | 2,045,189 |  |  |  |
Total loans individually evaluated for impairment | 0 |  | 0 |  |  |  |
Purchase credit impaired loans - recorded investment | 0 |  | 0 |  |  |  |
Total commercial loans | 1,966,155 |  | 2,045,189 |  |  |  |
TRUPs |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Valuation allowance | 25,500 |  | 25,500 |  |  |  |
TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans collectively evaluated for impairment | 304,236 |  | 304,236 | [1] |  |  |
Total loans individually evaluated for impairment | 3,097 |  | 3,209 | [1] |  |  |
Purchase credit impaired loans - recorded investment | 0 |  | 0 | [1] |  |  |
Total commercial loans | 307,333 |  | 307,445 | [1] |  |  |
Valuation allowance | $ 25,500 |  | $ 25,500 |  |  |  |
Highest internal grade | grade | 13 |  | 13 |  |  |  |
Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans collectively evaluated for impairment | $ 2,203,852 |  | $ 2,085,619 |  |  |  |
Total loans individually evaluated for impairment | 1,525 |  | 1,831 |  |  |  |
Purchase credit impaired loans - recorded investment | 3,792 |  | 4,583 |  |  |  |
Total commercial loans | 2,209,169 |  | 2,092,033 |  |  |  |
Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans collectively evaluated for impairment | 41,043 |  | 41,862 |  |  |  |
Total loans individually evaluated for impairment | 795 |  | 1,293 |  |  |  |
Purchase credit impaired loans - recorded investment | 8 |  | 335 |  |  |  |
Total commercial loans | 41,846 |  | 43,490 |  |  |  |
Commercial Loan P D Grade One | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 585,650 |  | $ 466,257 |  |  |  |
Percent of total commercial loans (percent) | 4.00% |  | 3.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 81 |  | $ 77 |  |  |  |
Commercial Loan P D Grade One | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 583,818 |  | 465,179 |  |  |  |
Commercial Loan P D Grade One | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 |  |  |  |
Commercial Loan P D Grade One | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade One | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 1,832 |  | 1,078 |  |  |  |
Commercial Loan P D Grade One | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 |  |  |  |
Commercial Loan P D Grade Two | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 909,881 |  | $ 803,012 |  |  |  |
Percent of total commercial loans (percent) | 6.00% |  | 6.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 385 |  | $ 403 |  |  |  |
Commercial Loan P D Grade Two | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 905,992 |  | 791,183 |  |  |  |
Commercial Loan P D Grade Two | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 |  |  |  |
Commercial Loan P D Grade Two | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Two | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 3,777 |  | 11,742 |  |  |  |
Commercial Loan P D Grade Two | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 112 |  | 87 |  |  |  |
Commercial Loan P D Grade Three | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 1,300,522 |  | $ 1,107,542 |  |  |  |
Percent of total commercial loans (percent) | 9.00% |  | 8.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 277 |  | $ 304 |  |  |  |
Commercial Loan P D Grade Three | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 500,056 |  | 491,386 |  |  |  |
Commercial Loan P D Grade Three | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 643,772 |  | 462,486 |  |  |  |
Commercial Loan P D Grade Three | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Three | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 156,694 |  | 153,670 |  |  |  |
Commercial Loan P D Grade Three | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 |  |  |  |
Commercial Loan P D Grade Four | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 1,901,151 |  | $ 1,532,811 |  |  |  |
Percent of total commercial loans (percent) | 13.00% |  | 11.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 955 |  | $ 953 |  |  |  |
Commercial Loan P D Grade Four | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 1,026,592 |  | 978,282 |  |  |  |
Commercial Loan P D Grade Four | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 578,566 |  | 332,107 |  |  |  |
Commercial Loan P D Grade Four | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Four | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 295,781 |  | 222,422 |  |  |  |
Commercial Loan P D Grade Four | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 212 |  | 0 |  |  |  |
Commercial Loan P D Grade Five | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 2,117,757 |  | $ 1,873,965 |  |  |  |
Percent of total commercial loans (percent) | 14.00% |  | 13.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 7,697 |  | $ 6,670 |  |  |  |
Commercial Loan P D Grade Five | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 1,460,107 |  | 1,232,401 |  |  |  |
Commercial Loan P D Grade Five | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 211,846 |  | 275,209 |  |  |  |
Commercial Loan P D Grade Five | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Five | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 443,751 |  | 365,653 |  |  |  |
Commercial Loan P D Grade Five | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 2,053 |  | 702 |  |  |  |
Commercial Loan P D Grade Six | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 2,302,052 |  | $ 2,502,310 |  |  |  |
Percent of total commercial loans (percent) | 14.00% |  | 17.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 9,857 |  | $ 10,403 |  |  |  |
Commercial Loan P D Grade Six | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 1,519,911 |  | 1,540,519 |  |  |  |
Commercial Loan P D Grade Six | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 362,685 |  | 614,109 |  |  |  |
Commercial Loan P D Grade Six | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Six | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 413,342 |  | 338,344 |  |  |  |
Commercial Loan P D Grade Six | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 6,114 |  | 9,338 |  |  |  |
Commercial Loan P D Grade Seven | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 2,220,394 |  | $ 2,228,369 |  |  |  |
Percent of total commercial loans (percent) | 14.00% |  | 16.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 13,297 |  | $ 14,010 |  |  |  |
Commercial Loan P D Grade Seven | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 1,705,394 |  | 1,556,117 |  |  |  |
Commercial Loan P D Grade Seven | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 60,135 |  | 317,283 |  |  |  |
Commercial Loan P D Grade Seven | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Seven | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 446,493 |  | 352,390 |  |  |  |
Commercial Loan P D Grade Seven | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 8,372 |  | 2,579 |  |  |  |
Commercial Loan P D Grade Eight | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 1,341,553 |  | $ 1,422,786 |  |  |  |
Percent of total commercial loans (percent) | 9.00% |  | 10.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 20,963 |  | $ 25,986 |  |  |  |
Commercial Loan P D Grade Eight | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 1,042,209 |  | 963,359 |  |  |  |
Commercial Loan P D Grade Eight | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 34,623 |  | 30,974 |  |  |  |
Commercial Loan P D Grade Eight | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Eight | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 259,813 |  | 425,503 |  |  |  |
Commercial Loan P D Grade Eight | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 4,908 |  | 2,950 |  |  |  |
Commercial Loan P D Grade Nine | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 687,974 |  | $ 725,767 |  |  |  |
Percent of total commercial loans (percent) | 5.00% |  | 5.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 11,376 |  | $ 13,857 |  |  |  |
Commercial Loan P D Grade Nine | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 556,662 |  | 611,774 |  |  |  |
Commercial Loan P D Grade Nine | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 60,954 |  | 4,299 |  |  |  |
Commercial Loan P D Grade Nine | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Nine | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 66,082 |  | 105,277 |  |  |  |
Commercial Loan P D Grade Nine | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 4,276 |  | 4,417 |  |  |  |
Commercial Loan P D Grade Ten | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 433,315 |  | $ 423,616 |  |  |  |
Percent of total commercial loans (percent) | 3.00% |  | 3.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 8,502 |  | $ 8,400 |  |  |  |
Commercial Loan P D Grade Ten | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 395,187 |  | 355,359 |  |  |  |
Commercial Loan P D Grade Ten | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 8,663 |  |  |  |
Commercial Loan P D Grade Ten | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Ten | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 31,570 |  | 50,484 |  |  |  |
Commercial Loan P D Grade Ten | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 6,558 |  | 9,110 |  |  |  |
Commercial Loan P D Grade Eleven | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 260,435 |  | $ 265,371 |  |  |  |
Percent of total commercial loans (percent) | 2.00% |  | 2.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 6,730 |  | $ 6,556 |  |  |  |
Commercial Loan P D Grade Eleven | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 217,190 |  | 238,230 |  |  |  |
Commercial Loan P D Grade Eleven | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 13,548 |  | 0 |  |  |  |
Commercial Loan P D Grade Eleven | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Eleven | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 24,878 |  | 20,600 |  |  |  |
Commercial Loan P D Grade Eleven | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 4,819 |  | 6,541 |  |  |  |
Commercial Loan P D Grade Twelve | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 199,436 |  | $ 190,094 |  |  |  |
Percent of total commercial loans (percent) | 1.00% |  | 1.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 7,065 |  | $ 6,377 |  |  |  |
Commercial Loan P D Grade Twelve | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 185,929 |  | 170,531 |  |  |  |
Commercial Loan P D Grade Twelve | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 |  |  |  |
Commercial Loan P D Grade Twelve | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Twelve | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 10,798 |  | 15,395 |  |  |  |
Commercial Loan P D Grade Twelve | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 2,709 |  | 4,168 |  |  |  |
Commercial Loan P D Grade Thirteen | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 486,035 |  | $ 432,571 |  |  |  |
Percent of total commercial loans (percent) | 3.00% |  | 3.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 6,927 |  | $ 4,225 |  |  |  |
Commercial Loan P D Grade Thirteen | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 142,729 |  | 121,276 |  |  |  |
Commercial Loan P D Grade Thirteen | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 |  |  |  |
Commercial Loan P D Grade Thirteen | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 304,236 |  | 304,236 | [1] |  |  |
Commercial Loan P D Grade Thirteen | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 38,979 |  | 6,748 |  |  |  |
Commercial Loan P D Grade Thirteen | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 91 |  | 311 |  |  |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 237,831 |  | $ 212,603 |  |  |  |
Percent of total commercial loans (percent) | 2.00% |  | 1.00% |  |  |  |
Loans and Leases Receivable, Allowance | $ 23,974 |  | $ 20,297 |  |  |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen | General C I | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 226,924 |  | 194,572 |  |  |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 26 |  | 59 |  |  |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen | TRUPs | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 0 |  | 0 | [1] |  |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen | Income C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | 10,062 |  | 16,313 |  |  |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen | Residential C R E | Commercial Portfolio Segment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial loan, Disaggregated by PD grade | $ 819 |  | $ 1,659 |  |  |  |
[1] | Balances as of September 30, 2017 and December 31, 2016, presented net of a $25.5 million valuation allowance. Based on the underlying structure of the notes, the highest possible internal grade is “13”.

X
- Definition The recorded balance for loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
Name: | fhn_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesRecordedInvestment
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Highest Internal Grade + References No definition available. + Details
Name: | fhn_HighestInternalGrade
Namespace Prefix: | fhn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loan Balances As A Percentage Of Commercial Loans + References No definition available. + Details
Name: | fhn_LoanBalancesAsPercentageOfCommercialLoans
Namespace Prefix: | fhn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent Loan Collectively Evaluated For Impiarment + References No definition available. + Details
Name: | fhn_PercentLoanCollectivelyEvaluatedForImpiarment
Namespace Prefix: | fhn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent Loan Individually Evaluated For Impairment + References No definition available. + Details
Name: | fhn_PercentLoanIndividuallyEvaluatedForImpairment
Namespace Prefix: | fhn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent Loan Purchased Credit Impaired + References No definition available. + Details
Name: | fhn_PercentLoanPurchasedCreditImpaired
Namespace Prefix: | fhn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
Name: | us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAllowanceForLoanLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableBeforeFeesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fhn_GeneralCIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fhn_LoansToMortgageCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fhn_TRUPsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fhn_IncomeCREMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fhn_ResidentialCREMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=fhn_CommercialLoanPDGradeFourteenFifteenSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |