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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 507,599 | $ 528,458
Securities available for sale, Unrealized Gains | 1,155 | 1,681
Securities available for sale, Unrealized Losses | 16,526 | 5,166
Securities available for sale | 492,228 | 524,973
Securities held to maturity, Amortized Cost | 474,803 | 516,466
Securities held to maturity, Unrealized Gains | 1,300 | 2,341
Securities held to maturity, Unrealized Losses | 10,561 | 5,824
Securities held to maturity, fair value | 465,542 | 512,983
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 162,330 | 163,025
Securities available for sale, Unrealized Gains | 11 | 122
Securities available for sale, Unrealized Losses | 4,815 | 1,258
Securities available for sale | 157,526 | 161,889
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 250,791 | 283,557
Securities held to maturity, Unrealized Gains | 1,287 | 2,317
Securities held to maturity, Unrealized Losses | 1,559 | 662
Securities held to maturity, fair value | 250,519 | 285,212
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 163 | 217
Securities available for sale, Unrealized Gains |  | 1
Securities available for sale, Unrealized Losses |  | 1
Securities available for sale | 163 | 217
Securities held to maturity, Amortized Cost | 68,906 | 76,432
Securities held to maturity, Unrealized Losses | 2,966 | 1,958
Securities held to maturity, fair value | 65,940 | 74,474
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 40 | 45
Securities available for sale | 40 | 45
Securities held to maturity, Amortized Cost | 85,824 | 93,810
Securities held to maturity, Unrealized Gains |  | 3
Securities held to maturity, Unrealized Losses | 3,705 | 2,165
Securities held to maturity, fair value | 82,119 | 91,648
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 20,112 | 22,881
Securities held to maturity, Unrealized Gains |  | 5
Securities held to maturity, Unrealized Losses | 811 | 502
Securities held to maturity, fair value | 19,301 | 22,384
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 937 | 976
Securities available for sale | 937 | 976
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 345,269 | 365,433
Securities available for sale, Unrealized Gains | 1,144 | 1,559
Securities available for sale, Unrealized Losses | 11,711 | 3,908
Securities available for sale | 334,702 | 363,084
Securities held to maturity, Amortized Cost | 224,012 | 232,909
Securities held to maturity, Unrealized Gains | 13 | 24
Securities held to maturity, Unrealized Losses | 9,002 | 5,162
Securities held to maturity, fair value | 215,023 | 227,771
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 296,084 | 311,830
Securities available for sale, Unrealized Gains | 52 | 313
Securities available for sale, Unrealized Losses | 9,954 | 3,220
Securities available for sale | 286,182 | 308,923
Securities held to maturity, Amortized Cost | 10,574 | 9,732
Securities held to maturity, Unrealized Gains |  | 16
Securities held to maturity, Unrealized Losses | 340 | 88
Securities held to maturity, fair value | 10,234 | 9,660
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 38,387 | 41,290
Securities available for sale, Unrealized Gains | 15 | 76
Securities available for sale, Unrealized Losses | 1,655 | 675
Securities available for sale | 36,747 | 40,691
Securities held to maturity, Amortized Cost | 4,662 | 3,213
Securities held to maturity, Unrealized Losses | 226 | 119
Securities held to maturity, fair value | 4,436 | 3,094
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 10,595 | 12,051
Securities available for sale, Unrealized Gains | 140 | 193
Securities available for sale, Unrealized Losses | 102 | 12
Securities available for sale | 10,633 | 12,232
Securities held to maturity, Amortized Cost | 33,934 | 26,841
Securities held to maturity, Unrealized Gains | 13 |
Securities held to maturity, Unrealized Losses | 954 | 330
Securities held to maturity, fair value | $ 32,993 | $ 26,511

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