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Loans Credit Quality Indicator (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 22,976,786 | $ 20,784,991
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 22,331,647 | 20,171,876
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 199,162 | 227,692
Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 241,517 | 176,877
Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 204,460 | 208,546
Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 7,109,796 | 6,399,693
Commercial and industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 6,763,557 | 6,015,884
Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 92,286 | 157,245
Commercial and industrial | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 172,177 | 113,778
Commercial and industrial | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 81,776 | 112,786
Commercial real estate — owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 888,330 | 802,209
Commercial real estate — owner occupied | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 814,769 | 723,291
Commercial real estate — owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 16,033 | 14,181
Commercial real estate — owner occupied | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 38,879 | 41,997
Commercial real estate — owner occupied | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 18,649 | 22,740
Commercial and business lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 7,998,126 | 7,201,902
Commercial and business lending | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 7,578,326 | 6,739,175
Commercial and business lending | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 108,319 | 171,426
Commercial and business lending | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 211,056 | 155,775
Commercial and business lending | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 100,425 | 135,526
Commercial real estate — investor |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 3,996,415 | 3,315,254
Commercial real estate — investor | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 3,885,535 | 3,266,389
Commercial real estate — investor | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 59,587 | 24,845
Commercial real estate — investor | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 24,790 | 19,291
Commercial real estate — investor | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 26,503 | 4,729
Real estate construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,487,159 | 1,451,684
Real estate construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,452,888 | 1,421,504
Real estate construction | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 29,559 | 29,206
Real estate construction | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 3,168 | 0
Real estate construction | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,544 | 974
Commercial real estate lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,483,574 | 4,766,938
Commercial real estate lending | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 5,338,423 | 4,687,893
Commercial real estate lending | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 89,146 | 54,051
Commercial real estate lending | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 27,958 | 19,291
Commercial real estate lending | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 28,047 | 5,703
Total commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 13,481,700 | 11,968,840
Total commercial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 12,916,749 | 11,427,068
Total commercial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 197,465 | 225,477
Total commercial | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 239,014 | 175,066
Total commercial | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 128,472 | 141,229
Residential mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 8,207,253 | 7,546,534
Residential mortgage | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 8,141,803 | 7,490,860
Residential mortgage | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 199 | 426
Residential mortgage | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,355 | 1,616
Residential mortgage | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 62,896 | 53,632
Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 911,363 | 883,804
Home equity | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 897,471 | 868,958
Home equity | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 792 | 1,137
Home equity | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 142 | 195
Home equity | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 12,958 | 13,514
Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 376,470 | 385,813
Other consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 375,624 | 384,990
Other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 706 | 652
Other consumer | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 6 | 0
Other consumer | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 134 | 171
Total consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,495,086 | 8,816,151
Total consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 9,414,898 | 8,744,808
Total consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 1,697 | 2,215
Total consumer | Potential Problem |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | 2,503 | 1,811
Total consumer | Nonaccrual |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans | $ 75,988 | $ 67,317

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