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Securities Available For Sale (Summary Of Fair Value Of Securities With Continuous Unrealized Losses) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Schedule of Available for sale Securities [Line Items]    
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value $ 311,765 $ 148,059
Securities with continuous unrealized losses, Less than 12 months, Number of Investments | security 464 199
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses $ 8,093 $ 1,880
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value $ 18,611 $ 38,756
Securities with continuous unrealized losses, 12 months or longer, Number of Investments | security 54 71
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses $ 803 $ 1,161
Securities with continuous unrealized losses, Total, Estimated Fair Value $ 330,376 $ 186,815
Securities with continuous unrealized losses, Total, Number of Investments | security 518 270
Securities with continuous unrealized losses, Total, Unrealized Losses $ 8,896 $ 3,041
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 $ 197,914 $ 112,770
Securities with continuous unrealized losses, Less than 12 months, Number of Investments | security 257 142
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses $ 4,369 $ 1,342
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value $ 10,120 $ 23,646
Securities with continuous unrealized losses, 12 months or longer, Number of Investments | security 23 33
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses $ 496 $ 813
Securities with continuous unrealized losses, Total, Estimated Fair Value $ 208,034 $ 136,416
Securities with continuous unrealized losses, Total, Number of Investments | security 280 175
Securities with continuous unrealized losses, Total, Unrealized Losses $ 4,865 $ 2,155
US Government Agencies [Member]    
Schedule of Available for sale Securities [Line Items]    
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value $ 36,941 $ 20,201
Securities with continuous unrealized losses, Less than 12 months, Number of Investments | security 54 30
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses $ 472 $ 326
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value $ 4,263 $ 11,232
Securities with continuous unrealized losses, 12 months or longer, Number of Investments | security 15 22
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses $ 141 $ 221
Securities with continuous unrealized losses, Total, Estimated Fair Value $ 41,204 $ 31,433
Securities with continuous unrealized losses, Total, Number of Investments | security 69 52
Securities with continuous unrealized losses, Total, Unrealized Losses $ 613 $ 547
Private Label [Member]    
Schedule of Available for sale Securities [Line Items]    
Securities with continuous unrealized losses, Less than 12 months, Estimated Fair Value $ 107 $ 235
Securities with continuous unrealized losses, Less than 12 months, Number of Investments | security 2 2
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses   $ 2
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value $ 312 $ 178
Securities with continuous unrealized losses, 12 months or longer, Number of Investments | security 7 5
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses $ 11 $ 9
Securities with continuous unrealized losses, Total, Estimated Fair Value $ 419 $ 413
Securities with continuous unrealized losses, Total, Number of Investments | security 9 7
Securities with continuous unrealized losses, Total, Unrealized Losses $ 11 $ 11
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 $ 76,803 $ 14,853
Securities with continuous unrealized losses, Less than 12 months, Number of Investments | security 151 25
Securities with continuous unrealized losses, Less than 12 months, Unrealized Losses $ 3,252 $ 210
Securities with continuous unrealized losses, 12 months or longer, Estimated Fair Value $ 3,916 $ 3,700
Securities with continuous unrealized losses, 12 months or longer, Number of Investments | security 9 11
Securities with continuous unrealized losses, 12 months or longer, Unrealized Losses $ 155 $ 118
Securities with continuous unrealized losses, Total, Estimated Fair Value $ 80,719 $ 18,553
Securities with continuous unrealized losses, Total, Number of Investments | security 160 36
Securities with continuous unrealized losses, Total, Unrealized Losses $ 3,407 $ 328