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New accounting pronouncement benefit plans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other components of net periodic benefit income | $ 1,705 | $ 1,448
Total other income | 26,903 | 18,955
Employee Benefits and Share-based Compensation | 7,029 | 6,468
Other Cost and Expense, Operating | 1,910 | 1,656
Total other expense | $ 54,308 | 48,910
AccountingStandardsUpdate201707 [Member] | Scenario, Previously Reported [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other components of net periodic benefit income |  | 0
Total other income |  | 17,507
Employee Benefits and Share-based Compensation |  | 5,181
Other Cost and Expense, Operating |  | 1,495
Total other expense |  | 47,462
AccountingStandardsUpdate201707 [Member] | Restatement Adjustment [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other components of net periodic benefit income |  | 1,448
Total other income |  | 18,955
Employee Benefits and Share-based Compensation |  | 6,468
Other Cost and Expense, Operating |  | 1,656
Total other expense |  | $ 48,910

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- Definition Amount of cost (reversal of cost) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits. + References No definition available. + Details
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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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