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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Risk Management |
Derivative [Line Items] |
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments | The notional amount of the derivative instruments used to manage risk was $3.5 million at December 31, 2016.
Client-Related |
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) | December 31, 2017 |  | December 31, 2016 |  | December 31, 2017 |  | December 31, 2016 |  | December 31, 2017 |  | December 31, 2016
Non-designated hedging instruments |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 394,852 |  |  | $ | 124,322 |  |  | $ | 2,061 |  |  | $ | 982 |  |  | $ | 2,061 |  |  | $ | 982 |
Foreign exchange forward contracts | 1,528 |  |  | 3,034 |  |  | 1,528 |  |  | 3,034 |  |  | 1,528 |  |  | 3,034 |

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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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