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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 476,118 | $ 528,458
Securities available for sale, Unrealized Gains | 920 | 1,681
Securities available for sale, Unrealized Losses | 18,728 | 5,166
Securities available for sale | 458,310 | 524,973
Securities held to maturity, Amortized Cost | 459,623 | 516,466
Securities held to maturity, Unrealized Gains | 519 | 2,341
Securities held to maturity, Unrealized Losses | 12,424 | 5,824
Securities held to maturity, fair value | 447,718 | 512,983
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 157,786 | 163,025
Securities available for sale, Unrealized Gains |  | 122
Securities available for sale, Unrealized Losses | 5,977 | 1,258
Securities available for sale | 151,809 | 161,889
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 241,637 | 283,557
Securities held to maturity, Unrealized Gains | 519 | 2,317
Securities held to maturity, Unrealized Losses | 2,192 | 662
Securities held to maturity, fair value | 239,964 | 285,212
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 139 | 217
Securities available for sale, Unrealized Gains |  | 1
Securities available for sale, Unrealized Losses |  | 1
Securities available for sale | 139 | 217
Securities held to maturity, Amortized Cost | 65,130 | 76,432
Securities held to maturity, Unrealized Losses | 3,270 | 1,958
Securities held to maturity, fair value | 61,860 | 74,474
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 39 | 45
Securities available for sale | 39 | 45
Securities held to maturity, Amortized Cost | 81,676 | 93,810
Securities held to maturity, Unrealized Gains |  | 3
Securities held to maturity, Unrealized Losses | 4,103 | 2,165
Securities held to maturity, fair value | 77,573 | 91,648
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 18,824 | 22,881
Securities held to maturity, Unrealized Gains |  | 5
Securities held to maturity, Unrealized Losses | 867 | 502
Securities held to maturity, fair value | 17,957 | 22,384
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 850 | 976
Securities available for sale | 850 | 976
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 318,332 | 365,433
Securities available for sale, Unrealized Gains | 920 | 1,559
Securities available for sale, Unrealized Losses | 12,751 | 3,908
Securities available for sale | 306,501 | 363,084
Securities held to maturity, Amortized Cost | 217,986 | 232,909
Securities held to maturity, Unrealized Gains |  | 24
Securities held to maturity, Unrealized Losses | 10,232 | 5,162
Securities held to maturity, fair value | 207,754 | 227,771
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 275,416 | 311,830
Securities available for sale, Unrealized Gains | 39 | 313
Securities available for sale, Unrealized Losses | 10,778 | 3,220
Securities available for sale | 264,677 | 308,923
Securities held to maturity, Amortized Cost | 12,032 | 9,732
Securities held to maturity, Unrealized Gains |  | 16
Securities held to maturity, Unrealized Losses | 467 | 88
Securities held to maturity, fair value | 11,565 | 9,660
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 37,088 | 41,290
Securities available for sale, Unrealized Gains | 10 | 76
Securities available for sale, Unrealized Losses | 1,847 | 675
Securities available for sale | 35,251 | 40,691
Securities held to maturity, Amortized Cost | 4,616 | 3,213
Securities held to maturity, Unrealized Losses | 272 | 119
Securities held to maturity, fair value | 4,344 | 3,094
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 5,650 | 12,051
Securities available for sale, Unrealized Gains | 21 | 193
Securities available for sale, Unrealized Losses | 126 | 12
Securities available for sale | 5,545 | 12,232
Securities held to maturity, Amortized Cost | 35,708 | 26,841
Securities held to maturity, Unrealized Losses | 1,253 | 330
Securities held to maturity, fair value | $ 34,455 | $ 26,511

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