Long-term Debt - Trust Preferred and Hybrid Securities (Details)
|12 Months Ended|
Dec. 31, 2017
|Junior subordinated notes (related to trust preferred securities)|
|Debt Instrument [Line Items]|
|Interest payment deferral period (not to exceed)||5 years|
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.
No definition available.