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Securities Available For Sale (Schedule Of Fair Value Of Securities With Continuous Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
security
Dec. 31, 2013
security
Schedule of Available for sale Securities [Line Items]    
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value $ 173,964 $ 209,525
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 267 334
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 5,622 12,445
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 69,171 58,632
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 102 89
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 5,486 6,185
Securities with continuous unrealized losses, Estimated Fair Value 243,135 268,157
Securities with continuous unrealized losses, Number of Investments 369 423
Securities with continuous unrealized losses, Unrealized Losses 11,108 18,630
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 95,348 111,169
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 115 140
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 2,544 4,801
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 42,445 40,563
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 45 40
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 3,128 3,791
Securities with continuous unrealized losses, Estimated Fair Value 137,793 151,732
Securities with continuous unrealized losses, Number of Investments 160 180
Securities with continuous unrealized losses, Unrealized Losses 5,672 8,592
US Government Agency [Member]
    
Schedule of Available for sale Securities [Line Items]    
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value 30,921 36,356
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 43 47
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 1,035 1,982
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 11,100 9,156
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 13 12
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 485 475
Securities with continuous unrealized losses, Estimated Fair Value 42,021 45,512
Securities with continuous unrealized losses, Number of Investments 56 59
Securities with continuous unrealized losses, Unrealized Losses 1,520 2,457
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 444 826
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 4 12
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 9 61
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 45 449
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 2 7
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 2 17
Securities with continuous unrealized losses, Estimated Fair Value 489 1,275
Securities with continuous unrealized losses, Number of Investments 6 19
Securities with continuous unrealized losses, Unrealized Losses 11 78
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 47,251 61,174
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 105 135
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 2,034 5,601
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 15,581 8,464
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 42 30
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 1,871 1,902
Securities with continuous unrealized losses, Estimated Fair Value 62,832 69,638
Securities with continuous unrealized losses, Number of Investments 147 165
Securities with continuous unrealized losses, Unrealized Losses $ 3,905 $ 7,503