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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 601,939 | $ 543,621
Securities available for sale, Unrealized Gains | 17,803 | 4,599
Securities available for sale, Unrealized Losses | 23 | 3,825
Securities available for sale | 619,719 | 544,395
Securities held to maturity, Amortized Cost | 478,549 | 485,717
Securities held to maturity, Unrealized Gains | 12,306 | 6,628
Securities held to maturity, Unrealized Losses | 22 | 2,281
Securities held to maturity, fair value | 490,833 | 490,064
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 241,583 | 260,748
Securities available for sale, Unrealized Gains | 6,550 | 1,164
Securities available for sale, Unrealized Losses | 7 | 1,049
Securities available for sale | 248,126 | 260,863
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 294,507 | 294,423
Securities held to maturity, Unrealized Gains | 10,061 | 6,562
Securities held to maturity, Unrealized Losses | 1 | 4
Securities held to maturity, fair value | 304,567 | 300,981
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 363 | 16,998
Securities available for sale, Unrealized Gains |  | 90
Securities available for sale, Unrealized Losses | 1 | 154
Securities available for sale | 362 | 16,934
Securities held to maturity, Amortized Cost | 54,246 | 56,791
Securities held to maturity, Unrealized Gains | 525 |
Securities held to maturity, Unrealized Losses | 11 | 818
Securities held to maturity, fair value | 54,760 | 55,973
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 77 | 5,175
Securities available for sale, Unrealized Gains |  | 1
Securities available for sale, Unrealized Losses | 1 | 91
Securities available for sale | 76 | 5,085
Securities held to maturity, Amortized Cost | 76,655 | 80,570
Securities held to maturity, Unrealized Gains | 1,038 |
Securities held to maturity, Unrealized Losses | 2 | 1,120
Securities held to maturity, fair value | 77,691 | 79,450
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 15,116 | 19,084
Securities held to maturity, Unrealized Gains | 85 | 19
Securities held to maturity, Unrealized Losses | 4 | 101
Securities held to maturity, fair value | 15,197 | 19,002
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 784 | 809
Securities available for sale | 784 | 809
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 360,356 | 282,873
Securities available for sale, Unrealized Gains | 11,069 | 3,217
Securities available for sale, Unrealized Losses | 16 | 2,776
Securities available for sale | 371,409 | 283,314
Securities held to maturity, Amortized Cost | 184,042 | 191,294
Securities held to maturity, Unrealized Gains | 2,245 | 66
Securities held to maturity, Unrealized Losses | 21 | 2,277
Securities held to maturity, fair value | 186,266 | 189,083
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 311,783 | 209,671
Securities available for sale, Unrealized Gains | 8,776 | 1,092
Securities available for sale, Unrealized Losses |  | 2,333
Securities available for sale | 320,559 | 208,430
Securities held to maturity, Amortized Cost | 12,047 | 9,242
Securities held to maturity, Unrealized Gains | 290 | 14
Securities held to maturity, Unrealized Losses |  | 79
Securities held to maturity, fair value | 12,337 | 9,177
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 30,743 | 24,564
Securities available for sale, Unrealized Gains | 772 | 282
Securities available for sale, Unrealized Losses |  | 194
Securities available for sale | 31,515 | 24,652
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 17,390 | 26,465
Securities available for sale, Unrealized Gains | 737 | 943
Securities available for sale, Unrealized Losses | 14 | 4
Securities available for sale | 18,113 | 27,404
Securities held to maturity, Amortized Cost | 25,978 | 25,607
Securities held to maturity, Unrealized Gains | 307 | 33
Securities held to maturity, Unrealized Losses | 4 | 159
Securities held to maturity, fair value | 26,281 | 25,481
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 184 | 218
Securities available for sale | $ 184 | $ 218

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