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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 543,621 | $ 619,293
Securities available for sale, Unrealized Gains | 4,599 | 9,016
Securities available for sale, Unrealized Losses | 3,825 | 5,815
Securities available for sale | 544,395 | 622,494
Securities held to maturity, Amortized Cost | 485,717 | 294,438
Securities held to maturity, Unrealized Gains | 6,628 | 4,377
Securities held to maturity, Unrealized Losses | 2,281 | 120
Securities held to maturity, fair value | 490,064 | 298,695
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 260,748 | 160,334
Securities available for sale, Unrealized Gains | 1,164 | 1,116
Securities available for sale, Unrealized Losses | 1,049 | 975
Securities available for sale | 260,863 | 160,475
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 294,423 | 277,273
Securities held to maturity, Unrealized Gains | 6,562 | 4,231
Securities held to maturity, Unrealized Losses | 4 | 120
Securities held to maturity, fair value | 300,981 | 281,384
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 16,998 | 76,247
Securities available for sale, Unrealized Gains | 90 | 489
Securities available for sale, Unrealized Losses | 154 | 944
Securities available for sale | 16,934 | 75,792
Securities held to maturity, Amortized Cost | 56,791 |
Securities held to maturity, Unrealized Losses | 818 |
Securities held to maturity, fair value | 55,973 |
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 5,175 | 89,623
Securities available for sale, Unrealized Gains | 1 | 199
Securities available for sale, Unrealized Losses | 91 | 2,585
Securities available for sale | 5,085 | 87,237
Securities held to maturity, Amortized Cost | 80,570 |
Securities held to maturity, Unrealized Losses | 1,120 |
Securities held to maturity, fair value | 79,450 |
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 | 19,084 |
Securities held to maturity, Unrealized Gains | 19 |
Securities held to maturity, Unrealized Losses | 101 |
Securities held to maturity, fair value | 19,002 |
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 809 | 1,218
Securities available for sale | 809 | 1,218
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 282,873 | 458,959
Securities available for sale, Unrealized Gains | 3,217 | 7,669
Securities available for sale, Unrealized Losses | 2,776 | 4,840
Securities available for sale | 283,314 | 461,788
Securities held to maturity, Amortized Cost | 191,294 | 17,165
Securities held to maturity, Unrealized Gains | 66 | 146
Securities held to maturity, Unrealized Losses | 2,277 |
Securities held to maturity, fair value | 189,083 | 17,311
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 209,671 | 184,857
Securities available for sale, Unrealized Gains | 1,092 | 2,344
Securities available for sale, Unrealized Losses | 2,333 | 1,264
Securities available for sale | 208,430 | 185,937
Securities held to maturity, Amortized Cost | 9,242 | 3,279
Securities held to maturity, Unrealized Gains | 14 | 24
Securities held to maturity, Unrealized Losses | 79 |
Securities held to maturity, fair value | 9,177 | 3,303
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 24,564 | 29,478
Securities available for sale, Unrealized Gains | 282 | 799
Securities available for sale, Unrealized Losses | 194 | 7
Securities available for sale | 24,652 | 30,270
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 26,465 | 48,800
Securities available for sale, Unrealized Gains | 943 | 2,022
Securities available for sale, Unrealized Losses | 4 |
Securities available for sale | 27,404 | 50,822
Securities held to maturity, Amortized Cost | 25,607 | 13,886
Securities held to maturity, Unrealized Gains | 33 | 122
Securities held to maturity, Unrealized Losses | 159 |
Securities held to maturity, fair value | 25,481 | 14,008
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 218 | 231
Securities available for sale | $ 218 | $ 231

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