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Investment Securities (Summary Of Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 597,656 | $ 543,621
Securities available for sale, Unrealized Gains | 12,457 | 4,599
Securities available for sale, Unrealized Losses | 100 | 3,825
Securities available for sale | 610,013 | 544,395
Securities held to maturity, Amortized Cost | 476,283 | 485,717
Securities held to maturity, Unrealized Gains | 9,651 | 6,628
Securities held to maturity, Unrealized Losses | 71 | 2,281
Securities held to maturity, fair value | 485,863 | 490,064
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 235,964 | 260,748
Securities available for sale, Unrealized Gains | 5,506 | 1,164
Securities available for sale, Unrealized Losses | 7 | 1,049
Securities available for sale | 241,463 | 260,863
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 291,934 | 294,423
Securities held to maturity, Unrealized Gains | 8,544 | 6,562
Securities held to maturity, Unrealized Losses | 1 | 4
Securities held to maturity, fair value | 300,477 | 300,981
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 16,986 | 16,998
Securities available for sale, Unrealized Gains | 394 | 90
Securities available for sale, Unrealized Losses |  | 154
Securities available for sale | 17,380 | 16,934
Securities held to maturity, Amortized Cost | 54,281 | 56,791
Securities held to maturity, Unrealized Gains | 227 |
Securities held to maturity, Unrealized Losses | 15 | 818
Securities held to maturity, fair value | 54,493 | 55,973
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 5,165 | 5,175
Securities available for sale, Unrealized Gains | 90 | 1
Securities available for sale, Unrealized Losses |  | 91
Securities available for sale | 5,255 | 5,085
Securities held to maturity, Amortized Cost | 77,407 | 80,570
Securities held to maturity, Unrealized Gains | 467 |
Securities held to maturity, Unrealized Losses | 5 | 1,120
Securities held to maturity, fair value | 77,869 | 79,450
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 17,106 | 19,084
Securities held to maturity, Unrealized Gains | 57 | 19
Securities held to maturity, Unrealized Losses | 7 | 101
Securities held to maturity, fair value | 17,156 | 19,002
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 777 | 809
Securities available for sale | 777 | 809
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 361,692 | 282,873
Securities available for sale, Unrealized Gains | 6,772 | 3,217
Securities available for sale, Unrealized Losses | 93 | 2,776
Securities available for sale | 368,371 | 283,314
Securities held to maturity, Amortized Cost | 184,349 | 191,294
Securities held to maturity, Unrealized Gains | 1,107 | 66
Securities held to maturity, Unrealized Losses | 70 | 2,277
Securities held to maturity, fair value | 185,386 | 189,083
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 293,220 | 209,671
Securities available for sale, Unrealized Gains | 4,312 | 1,092
Securities available for sale, Unrealized Losses | 53 | 2,333
Securities available for sale | 297,479 | 208,430
Securities held to maturity, Amortized Cost | 9,190 | 9,242
Securities held to maturity, Unrealized Gains | 152 | 14
Securities held to maturity, Unrealized Losses | 2 | 79
Securities held to maturity, fair value | 9,340 | 9,177
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 28,019 | 24,564
Securities available for sale, Unrealized Gains | 535 | 282
Securities available for sale, Unrealized Losses | 28 | 194
Securities available for sale | 28,526 | 24,652
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 18,302 | 26,465
Securities available for sale, Unrealized Gains | 664 | 943
Securities available for sale, Unrealized Losses | 12 | 4
Securities available for sale | 18,954 | 27,404
Securities held to maturity, Amortized Cost | 26,365 | 25,607
Securities held to maturity, Unrealized Gains | 204 | 33
Securities held to maturity, Unrealized Losses | 41 | 159
Securities held to maturity, fair value | 26,528 | 25,481
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 179 | 218
Securities available for sale | $ 179 | $ 218

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