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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 568,873 | $ 619,293
Securities available for sale, Unrealized Gains | 9,542 | 9,016
Securities available for sale, Unrealized Losses | 906 | 5,815
Securities available for sale | 577,509 | 622,494
Securities held to maturity, Amortized Cost | 490,638 | 294,438
Securities held to maturity, Unrealized Gains | 6,303 | 4,377
Securities held to maturity, Unrealized Losses | 190 | 120
Securities held to maturity, fair value | 496,751 | 298,695
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 261,364 | 160,334
Securities available for sale, Unrealized Gains | 2,539 | 1,116
Securities available for sale, Unrealized Losses | 351 | 975
Securities available for sale | 263,552 | 160,475
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 289,986 | 277,273
Securities held to maturity, Unrealized Gains | 6,110 | 4,231
Securities held to maturity, Unrealized Losses | 70 | 120
Securities held to maturity, fair value | 296,026 | 281,384
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 307,509 | 458,959
Securities available for sale, Unrealized Gains | 6,792 | 7,669
Securities available for sale, Unrealized Losses | 555 | 4,840
Securities available for sale | 313,746 | 461,788
Securities held to maturity, Amortized Cost | 200,652 | 17,165
Securities held to maturity, Unrealized Gains | 193 | 146
Securities held to maturity, Unrealized Losses | 120 |
Securities held to maturity, fair value | 200,725 | 17,311
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 220,626 | 184,857
Securities available for sale, Unrealized Gains | 3,482 | 2,344
Securities available for sale, Unrealized Losses | 468 | 1,264
Securities available for sale | 223,640 | 185,937
Securities held to maturity, Amortized Cost | 9,293 | 3,279
Securities held to maturity, Unrealized Gains | 81 | 24
Securities held to maturity, Unrealized Losses | 11 |
Securities held to maturity, fair value | 9,363 | 3,303
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 27,371 | 29,478
Securities available for sale, Unrealized Gains | 582 | 799
Securities available for sale, Unrealized Losses | 73 | 7
Securities available for sale | 27,880 | 30,270
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 33,533 | 48,800
Securities available for sale, Unrealized Gains | 1,399 | 2,022
Securities available for sale, Unrealized Losses | 3 |
Securities available for sale | 34,929 | 50,822
Securities held to maturity, Amortized Cost | 26,121 | 13,886
Securities held to maturity, Unrealized Gains | 112 | 122
Securities held to maturity, Unrealized Losses | 109 |
Securities held to maturity, fair value | 26,124 | 14,008
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 20,798 | 76,247
Securities available for sale, Unrealized Gains | 408 | 489
Securities available for sale, Unrealized Losses | 5 | 944
Securities available for sale | 21,201 | 75,792
Securities held to maturity, Amortized Cost | 59,490 |
Securities held to maturity, fair value | 59,490 |
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 5,181 | 89,623
Securities available for sale, Unrealized Gains | 1 | 199
Securities available for sale, Unrealized Losses | 6 | 2,585
Securities available for sale | 5,176 | 87,237
Securities held to maturity, Amortized Cost | 84,350 |
Securities held to maturity, fair value | 84,350 |
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost |  | 29,954
Securities available for sale, Unrealized Gains |  | 598
Securities available for sale, Unrealized Losses |  | 40
Securities available for sale |  | 30,512
Securities held to maturity, Amortized Cost | 21,398 |
Securities held to maturity, fair value | 21,398 |
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 920 | 1,218
Securities available for sale | 920 | 1,218
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 211 | 231
Securities available for sale | $ 211 | $ 231

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