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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
 9 Months Ended 12 Months Ended
Sep. 30, 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 $ 66,562 $ 209,525
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 89 334
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 1,078 12,445
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 107,462 58,632
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 151 89
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 4,199 6,185
Securities with continuous unrealized losses, Estimated Fair Value 174,024 268,157
Securities with continuous unrealized losses, Number of Investments 240 423
Securities with continuous unrealized losses, Unrealized Losses 5,277 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 41,276 111,169
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 47 140
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 811 4,801
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 64,852 40,563
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 74 40
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 2,996 3,791
Securities with continuous unrealized losses, Estimated Fair Value 106,128 151,732
Securities with continuous unrealized losses, Number of Investments 121 180
Securities with continuous unrealized losses, Unrealized Losses 3,807 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 23,356 36,356
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 37 47
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 256 1,982
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 19,316 9,156
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 23 12
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 726 475
Securities with continuous unrealized losses, Estimated Fair Value 42,672 45,512
Securities with continuous unrealized losses, Number of Investments 60 59
Securities with continuous unrealized losses, Unrealized Losses 982 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 3 826
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 1 12
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses   61
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 152 449
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 4 7
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 5 17
Securities with continuous unrealized losses, Estimated Fair Value 155 1,275
Securities with continuous unrealized losses, Number of Investments 5 19
Securities with continuous unrealized losses, Unrealized Losses 5 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 1,927 61,174
Securities with continuous unrealized losses, Less than 12 months, Number of Investments 4 135
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses 11 5,601
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value 23,142 8,464
Securities with continuous unrealized losses, 12 months or longer, Number of Investments 50 30
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses 472 1,902
Securities with continuous unrealized losses, Estimated Fair Value 25,069 69,638
Securities with continuous unrealized losses, Number of Investments 54 165
Securities with continuous unrealized losses, Unrealized Losses $ 483 $ 7,503