Securities Available For Sale (Schedule Of Fair Value Of Securities With Continuous Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013 item	Dec. 31, 2012 item
Schedule of Available for sale Securities [Line Items]
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value	$ 211,634	$ 82,548
Securities with continuous unrealized losses, Less than 12 months, Number of Investments	325	106
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses	12,066	1,589
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value	14,554	4,813
Securities with continuous unrealized losses, 12 months or longer, Number of Investments	33	28
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses	1,062	744
Securities with continuous unrealized losses, Estimated Fair Value	226,188	87,361
Securities with continuous unrealized losses, Number of Investments	358	134
Securities with continuous unrealized losses, Unrealized Losses	13,128	2,333
US Government-Sponsored Enterprises [Member]
Schedule of Available for sale Securities [Line Items]
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value	110,655	56,008
Securities with continuous unrealized losses, Less than 12 months, Number of Investments	145	55
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses	5,612	1,064
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value	8,832
Securities with continuous unrealized losses, 12 months or longer, Number of Investments	8
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses	223
Securities with continuous unrealized losses, Estimated Fair Value	119,487	56,008
Securities with continuous unrealized losses, Number of Investments	153	55
Securities with continuous unrealized losses, Unrealized Losses	5,835	1,064
US Government Agency [Member]
Schedule of Available for sale Securities [Line Items]
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value	45,440	15,281
Securities with continuous unrealized losses, Less than 12 months, Number of Investments	50	18
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses	1,516	216
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value	1,505	56
Securities with continuous unrealized losses, 12 months or longer, Number of Investments	4	2
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses	38
Securities with continuous unrealized losses, Estimated Fair Value	46,945	15,337
Securities with continuous unrealized losses, Number of Investments	54	20
Securities with continuous unrealized losses, Unrealized Losses	1,554	216
Private Label Mortgage-Backed Securities [Member]
Schedule of Available for sale Securities [Line Items]
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value	584	783
Securities with continuous unrealized losses, Less than 12 months, Number of Investments	6	6
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses	108	48
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value	975	2,196
Securities with continuous unrealized losses, 12 months or longer, Number of Investments	7	14
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses	67	473
Securities with continuous unrealized losses, Estimated Fair Value	1,559	2,979
Securities with continuous unrealized losses, Number of Investments	13	20
Securities with continuous unrealized losses, Unrealized Losses	175	521
Obligations Of States And Political Subdivisions Thereof [Member]
Schedule of Available for sale Securities [Line Items]
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value	54,955	10,476
Securities with continuous unrealized losses, Less than 12 months, Number of Investments	124	27
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses	4,830	261
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value	3,242	2,561
Securities with continuous unrealized losses, 12 months or longer, Number of Investments	14	12
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses	734	271
Securities with continuous unrealized losses, Estimated Fair Value	58,197	13,037
Securities with continuous unrealized losses, Number of Investments	138	39
Securities with continuous unrealized losses, Unrealized Losses	$ 5,564	$ 532