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Reportable Operating Segments - Revision of Prior Period Noninterest Income and Noninterest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Correction of an Immaterial Error to the Financial Statements |  |  |  |
Noninterest income | $ 49,797 | $ 50,558 | $ 98,497 | $ 101,617
Noninterest expense | 91,865 | 86,929 | 182,452 | 172,920
Commercial Banking |  |  |  |
Correction of an Immaterial Error to the Financial Statements |  |  |  |
Noninterest income | 21,463 | 20,197 | 41,463 | 39,031
Noninterest expense | 21,196 | 17,034 | 40,844 | 33,347
Treasury and Other |  |  |  |
Correction of an Immaterial Error to the Financial Statements |  |  |  |
Noninterest income | 6,176 | 7,980 | 12,144 | 16,586
Noninterest expense | $ 15,085 | 13,727 | $ 29,563 | 28,165
Restatement adjustment | Misclassifications of noninterest income and noninterest expense | Commercial Banking |  |  |  |
Correction of an Immaterial Error to the Financial Statements |  |  |  |
Noninterest income |  | 1,300 |  | 2,500
Noninterest expense |  | 1,300 |  | 2,500
Restatement adjustment | Misclassifications of noninterest income and noninterest expense | Treasury and Other |  |  |  |
Correction of an Immaterial Error to the Financial Statements |  |  |  |
Noninterest income |  | 400 |  | 800
Noninterest expense |  | $ 400 |  | $ 800

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- Definition Total aggregate amount of all noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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