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Loans Composition (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | $ 22,976,786 | $ 20,784,991
Purchased credit-impaired loans | 211,687 | 247,575
Commercial and industrial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 7,109,796 | 6,399,693
Purchased credit-impaired loans | 110,993 | 142,244
Commercial real estate — owner occupied |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 888,330 | 802,209
Purchased credit-impaired loans | 20,255 | 26,234
Commercial and business lending |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 7,998,126 | 7,201,902
Purchased credit-impaired loans | 131,248 | 168,478
Commercial real estate — investor |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 3,996,415 | 3,315,254
Purchased credit-impaired loans | 16,381 | 19,118
Real estate construction |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 1,487,159 | 1,451,684
Purchased credit-impaired loans | 448 | 467
Commercial real estate lending |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 5,483,574 | 4,766,938
Total commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 13,481,700 | 11,968,840
Residential mortgage |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 8,207,253 | 7,546,534
Purchased credit-impaired loans | 51,469 | 47,486
Home equity |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 911,363 | 883,804
Purchased credit-impaired loans | 11,092 | 10,891
Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 376,470 | 385,813
Purchased credit-impaired loans | 1,049 | 1,135
Total consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 9,495,086 | $ 8,816,151
Bank Mutual [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans and Leases Receivable, Net of Deferred Income, Purchased Credit Impaired Loans And Covered Loans | $ 16,000 |

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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio which are purchased credit impaired and those whose losses will be shared with the Federal Deposit Insurance Corporation under loss sharing agreements before deducting the allowance for losses on loans and leases. + References No definition available. + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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