Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 264,982	$ 711,142
Securities Available-for-Sale, Less than 12 months, Unrealized losses	676	4,893
Securities Available-for-Sale, 12 months or longer, Fair value	178,129	309,633
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,531	5,921
Securities Available-for-Sale, Fair value, Total	443,111	1,020,775
Securities Available-for-Sale, Unrealized losses, Total	2,207	10,814
Securities Held-to-Maturity, Less than 12 months, Fair value	2,369
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	11
Securities Held-to-Maturity, 12 months or longer, Fair value	7,784
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	68
Securities Held-to-Maturity, Fair value, Total	10,153
Securities Held-to-Maturity, Unrealized losses, Total	79	134
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	204,466	326,973
Securities Available-for-Sale, Less than 12 months, Unrealized losses	535	2,117
Securities Available-for-Sale, 12 months or longer, Fair value	66,544	195,090
Securities Available-for-Sale, 12 months or longer, Unrealized losses	353	3,425
Securities Available-for-Sale, Fair value, Total	271,010	522,063
Securities Available-for-Sale, Unrealized losses, Total	888	5,542
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	60,516	384,169
Securities Available-for-Sale, Less than 12 months, Unrealized losses	141	2,776
Securities Available-for-Sale, 12 months or longer, Fair value	111,585	114,543
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,178	2,496
Securities Available-for-Sale, Fair value, Total	172,101	498,712
Securities Available-for-Sale, Unrealized losses, Total	1,319	5,272
Securities Held-to-Maturity, Less than 12 months, Fair value		5,656
Securities Held-to-Maturity, Less than 12 months, Unrealized losses		10
Securities Held-to-Maturity, 12 months or longer, Fair value	7,784	7,792
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	68	124
Securities Held-to-Maturity, Fair value, Total	7,784	13,448
Securities Held-to-Maturity, Unrealized losses, Total	68	$ 134
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Held-to-Maturity, Less than 12 months, Fair value	2,369
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	11
Securities Held-to-Maturity, 12 months or longer, Fair value	0
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	0
Securities Held-to-Maturity, Fair value, Total	2,369
Securities Held-to-Maturity, Unrealized losses, Total	$ 11

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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