Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 94,975	$ 711,142
Securities Available-for-Sale, Less than 12 months, Unrealized losses	25	4,893
Securities Available-for-Sale, 12 months or longer, Fair value	61,150	309,633
Securities Available-for-Sale, 12 months or longer, Unrealized losses	111	5,921
Securities Available-for-Sale, Fair value, Total	156,125	1,020,775
Securities Available-for-Sale, Unrealized losses, Total	136	10,814
Securities Held-to-Maturity, 12 months or longer, Fair value	7,759
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	28
Securities Held-to-Maturity, Fair value, Total	7,759
Securities Held-to-Maturity, Unrealized losses, Total	28	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	94,975	326,973
Securities Available-for-Sale, Less than 12 months, Unrealized losses	25	2,117
Securities Available-for-Sale, 12 months or longer, Fair value		195,090
Securities Available-for-Sale, 12 months or longer, Unrealized losses		3,425
Securities Available-for-Sale, Fair value, Total	94,975	522,063
Securities Available-for-Sale, Unrealized losses, Total	25	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		384,169
Securities Available-for-Sale, Less than 12 months, Unrealized losses		2,776
Securities Available-for-Sale, 12 months or longer, Fair value	61,150	114,543
Securities Available-for-Sale, 12 months or longer, Unrealized losses	111	2,496
Securities Available-for-Sale, Fair value, Total	61,150	498,712
Securities Available-for-Sale, Unrealized losses, Total	111	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	7,759	7,792
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	28	124
Securities Held-to-Maturity, Fair value, Total	7,759	13,448
Securities Held-to-Maturity, Unrealized losses, Total	28	$ 134
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
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, Unrealized losses, Total	$ 0

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)
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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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