Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 179,173	$ 193,189
Securities Available-for-Sale, Less than 12 months, Unrealized losses	827	223
Securities Available-for-Sale, 12 months or longer, Fair value	348,011	558,570
Securities Available-for-Sale, 12 months or longer, Unrealized losses	3,752	12,852
Securities Available-for-Sale, Fair value, Total	527,184	751,759
Securities Available-for-Sale, Unrealized losses, Total	4,579	13,075
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	179,173	119,913
Securities Available-for-Sale, Less than 12 months, Unrealized losses	827	87
Securities Available-for-Sale, 12 months or longer, Fair value	215,428	388,140
Securities Available-for-Sale, 12 months or longer, Unrealized losses	1,459	8,746
Securities Available-for-Sale, Fair value, Total	394,601	508,053
Securities Available-for-Sale, Unrealized losses, Total	2,286	8,833
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value		73,276
Securities Available-for-Sale, Less than 12 months, Unrealized losses		136
Securities Available-for-Sale, 12 months or longer, Fair value	132,583	170,430
Securities Available-for-Sale, 12 months or longer, Unrealized losses	2,293	4,106
Securities Available-for-Sale, Fair value, Total	132,583	243,706
Securities Available-for-Sale, Unrealized losses, Total	2,293	4,242
Securities Held-to-Maturity, Less than 12 months, Fair value		8,032
Securities Held-to-Maturity, Less than 12 months, Unrealized losses		148
Securities Held-to-Maturity, 12 months or longer, Fair value	8,028	2,714
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	83	12
Securities Held-to-Maturity, Fair value, Total	8,028	10,746
Securities Held-to-Maturity, Unrealized losses, Total	$ 83	$ 160

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.

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