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Derivative Financial Instruments (Tables) - Client-Related | 9 Months Ended
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Sep. 30, 2018
Derivative [Line Items] |
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments | The table below summarizes the notional amounts and fair values of the client-related derivative instruments:
|  | Asset Derivatives (Other Assets) |  | Liability Derivatives (Other Liabilities)
| Notional Amount |  | Fair Value |  | Fair Value
(in thousands) | September 30, 2018 |  | December 31, 2017 |  | September 30, 2018 |  | December 31, 2017 |  | September 30, 2018 |  | December 31, 2017
Non-designated hedging instruments |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 433,664 |  |  | $ | 394,852 |  |  | $ | 4,772 |  |  | $ | 2,061 |  |  | $ | 4,772 |  |  | $ | 2,061 |
Foreign exchange forward contracts | 123 |  |  | 1,528 |  |  | 123 |  |  | 1,528 |  |  | 123 |  |  | 1,528 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance | For the three and nine months ended September 30, 2018 and 2017, the gains and losses offset each other due to the Company's hedging of the client swaps and foreign exchange contracts with other bank counterparties.

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- Definition Schedule of Derivatives Not Designated as Hedging Instruments, Notional Amount And Statements of Financial Position, Location [Table Text Block] + References No definition available. + Details
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- 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
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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