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Basis Of Presentation (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Dec. 31, 2017
Basis Of Presentation [Abstract]
Days after publication in the Federal Reserve	30 days
U.S. tax rate	21.00%	35.00%
Reclass due to early adoption of Accounting Standards Update 2018-02				$ 1,250,000
Cumulative change due to ASU			$ 0	$ 1,201,000
Operating lease right of use assets	$ 66,430,000		$ 69,869,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]			us-gaap:OtherAssets
Operating lease liabilities	$ 73,529,000		$ 77,270,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]			us-gaap:OtherLiabilities

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Days after publication in the Federal Reserve

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount reclassified to unappropriated retained earnings from accumulated increase (decrease) in the fair value of the financial assets (liabilities) of the collateralized financing entity.

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