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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 543,508 | $ 543,992
Securities available for sale, Unrealized Gains | 2,908 | 2,928
Securities available for sale, Unrealized Losses | 6,010 | 6,994
Securities available for sale | 540,406 | 539,926
Securities held to maturity, Amortized Cost | 545,381 | 543,338
Securities held to maturity, Unrealized Gains | 3,853 | 2,287
Securities held to maturity, Unrealized Losses | 4,796 | 5,634
Securities held to maturity, fair value | 544,438 | 539,991
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 190,793 | 187,325
Securities available for sale, Unrealized Gains | 595 | 512
Securities available for sale, Unrealized Losses | 1,173 | 1,569
Securities available for sale | 190,215 | 186,268
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 307,894 | 305,248
Securities held to maturity, Unrealized Gains | 3,723 | 2,127
Securities held to maturity, Unrealized Losses | 892 | 1,616
Securities held to maturity, fair value | 310,725 | 305,759
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 308 | 16,921
Securities available for sale, Unrealized Gains |  | 74
Securities available for sale, Unrealized Losses | 2 | 125
Securities available for sale | 306 | 16,870
Securities held to maturity, Amortized Cost | 85,474 | 83,929
Securities held to maturity, Unrealized Gains | 21 | 21
Securities held to maturity, Unrealized Losses | 1,433 | 1,573
Securities held to maturity, fair value | 84,062 | 82,377
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 59 | 5,142
Securities available for sale, Unrealized Losses | 1 | 65
Securities available for sale | 58 | 5,077
Securities held to maturity, Amortized Cost | 98,029 | 101,025
Securities held to maturity, Unrealized Gains | 75 | 80
Securities held to maturity, Unrealized Losses | 1,791 | 1,827
Securities held to maturity, fair value | 96,313 | 99,278
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 13,273 | 14,909
Securities held to maturity, Unrealized Gains | 34 | 40
Securities held to maturity, Unrealized Losses | 149 | 162
Securities held to maturity, fair value | 13,158 | 14,787
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 819 | 824
Securities available for sale | 819 | 824
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 352,715 | 356,667
Securities available for sale, Unrealized Gains | 2,080 | 2,225
Securities available for sale, Unrealized Losses | 4,837 | 5,425
Securities available for sale | 349,958 | 353,467
Securities held to maturity, Amortized Cost | 237,487 | 238,090
Securities held to maturity, Unrealized Gains | 130 | 160
Securities held to maturity, Unrealized Losses | 3,904 | 4,018
Securities held to maturity, fair value | 233,713 | 234,232
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 303,388 | 288,949
Securities available for sale, Unrealized Gains | 842 | 897
Securities available for sale, Unrealized Losses | 4,008 | 4,413
Securities available for sale | 300,222 | 285,433
Securities held to maturity, Amortized Cost | 10,290 | 10,362
Securities held to maturity, Unrealized Gains |  | 1
Securities held to maturity, Unrealized Losses | 121 | 124
Securities held to maturity, fair value | 10,169 | 10,239
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 34,362 | 30,182
Securities available for sale, Unrealized Gains | 106 | 114
Securities available for sale, Unrealized Losses | 808 | 807
Securities available for sale | 33,660 | 29,489
Securities held to maturity, Amortized Cost | 3,270 | 3,290
Securities held to maturity, Unrealized Losses | 154 | 150
Securities held to maturity, fair value | 3,116 | 3,140
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 14,598 | 15,473
Securities available for sale, Unrealized Gains | 313 | 316
Securities available for sale, Unrealized Losses | 18 | 15
Securities available for sale | 14,893 | 15,774
Securities held to maturity, Amortized Cost | 27,151 | 24,575
Securities held to maturity, Unrealized Gains |  | 18
Securities held to maturity, Unrealized Losses | 256 | 182
Securities held to maturity, fair value | 26,895 | 24,411
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 233 | 191
Securities available for sale | $ 233 | $ 191

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