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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 544,063 | $ 543,621
Securities available for sale, Unrealized Gains | 15,465 | 4,599
Securities available for sale, Unrealized Losses | 33 | 3,825
Securities available for sale | 559,495 | 544,395
Securities held to maturity, Amortized Cost | 528,708 | 485,717
Securities held to maturity, Unrealized Gains | 10,218 | 6,628
Securities held to maturity, Unrealized Losses | 296 | 2,281
Securities held to maturity, fair value | 538,630 | 490,064
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 175,134 | 260,748
Securities available for sale, Unrealized Gains | 5,508 | 1,164
Securities available for sale, Unrealized Losses | 5 | 1,049
Securities available for sale | 180,637 | 260,863
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 300,922 | 294,423
Securities held to maturity, Unrealized Gains | 8,136 | 6,562
Securities held to maturity, Unrealized Losses | 45 | 4
Securities held to maturity, fair value | 309,013 | 300,981
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 328 | 16,998
Securities available for sale, Unrealized Gains |  | 90
Securities available for sale, Unrealized Losses | 1 | 154
Securities available for sale | 327 | 16,934
Securities held to maturity, Amortized Cost | 75,287 | 56,791
Securities held to maturity, Unrealized Gains | 426 |
Securities held to maturity, Unrealized Losses | 105 | 818
Securities held to maturity, fair value | 75,608 | 55,973
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 73 | 5,175
Securities available for sale, Unrealized Gains |  | 1
Securities available for sale, Unrealized Losses | 1 | 91
Securities available for sale | 72 | 5,085
Securities held to maturity, Amortized Cost | 98,439 | 80,570
Securities held to maturity, Unrealized Gains | 942 |
Securities held to maturity, Unrealized Losses | 128 | 1,120
Securities held to maturity, fair value | 99,253 | 79,450
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 16,885 | 19,084
Securities held to maturity, Unrealized Gains | 72 | 19
Securities held to maturity, Unrealized Losses | 16 | 101
Securities held to maturity, fair value | 16,941 | 19,002
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 816 | 809
Securities available for sale | 816 | 809
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 368,929 | 282,873
Securities available for sale, Unrealized Gains | 9,762 | 3,217
Securities available for sale, Unrealized Losses | 28 | 2,776
Securities available for sale | 378,663 | 283,314
Securities held to maturity, Amortized Cost | 227,786 | 191,294
Securities held to maturity, Unrealized Gains | 2,082 | 66
Securities held to maturity, Unrealized Losses | 251 | 2,277
Securities held to maturity, fair value | 229,617 | 189,083
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 312,771 | 209,671
Securities available for sale, Unrealized Gains | 7,501 | 1,092
Securities available for sale, Unrealized Losses |  | 2,333
Securities available for sale | 320,272 | 208,430
Securities held to maturity, Amortized Cost | 10,422 | 9,242
Securities held to maturity, Unrealized Gains | 276 | 14
Securities held to maturity, Unrealized Losses |  | 79
Securities held to maturity, fair value | 10,698 | 9,177
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 39,425 | 24,564
Securities available for sale, Unrealized Gains | 773 | 282
Securities available for sale, Unrealized Losses | 11 | 194
Securities available for sale | 40,187 | 24,652
Securities held to maturity, Amortized Cost | 1,351 |
Securities held to maturity, Unrealized Losses | 1 |
Securities held to maturity, fair value | 1,350 |
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 16,332 | 26,465
Securities available for sale, Unrealized Gains | 672 | 943
Securities available for sale, Unrealized Losses | 15 | 4
Securities available for sale | 16,989 | 27,404
Securities held to maturity, Amortized Cost | 25,402 | 25,607
Securities held to maturity, Unrealized Gains | 366 | 33
Securities held to maturity, Unrealized Losses | 1 | 159
Securities held to maturity, fair value | 25,767 | 25,481
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 195 | 218
Securities available for sale | $ 195 | $ 218

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