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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 430,214 | $ 455,582
Securities available for sale, Unrealized Gains | 1,146 | 845
Securities available for sale, Unrealized Losses | 3,815 | 10,750
Securities available for sale | 427,545 | 445,677
Securities held to maturity, Amortized Cost | 438,984 | 446,581
Securities held to maturity, Unrealized Gains | 2,419 | 899
Securities held to maturity, Unrealized Losses | 4,429 | 7,899
Securities held to maturity, fair value | 436,974 | 439,581
U.S. Government Agency And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 145,072 | 155,102
Securities available for sale, Unrealized Gains | 113 |
Securities available for sale, Unrealized Losses | 809 | 3,074
Securities available for sale | 144,376 | 152,028
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 232,160 | 234,845
Securities held to maturity, Unrealized Gains | 2,236 | 876
Securities held to maturity, Unrealized Losses | 225 | 1,211
Securities held to maturity, fair value | 234,171 | 234,510
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 127 | 133
Securities available for sale, Unrealized Losses | 1 |
Securities available for sale | 126 | 133
Securities held to maturity, Amortized Cost | 59,584 | 62,103
Securities held to maturity, Unrealized Gains | 31 | 1
Securities held to maturity, Unrealized Losses | 1,474 | 2,179
Securities held to maturity, fair value | 58,141 | 59,925
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 36 | 37
Securities available for sale | 36 | 37
Securities held to maturity, Amortized Cost | 75,029 | 78,200
Securities held to maturity, Unrealized Gains | 6 |
Securities held to maturity, Unrealized Losses | 1,624 | 2,597
Securities held to maturity, fair value | 73,411 | 75,603
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 16,924 | 17,798
Securities held to maturity, Unrealized Losses | 363 | 535
Securities held to maturity, fair value | 16,561 | 17,263
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 723 | 767
Securities available for sale | 723 | 767
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 285,142 | 300,480
Securities available for sale, Unrealized Gains | 1,033 | 845
Securities available for sale, Unrealized Losses | 3,006 | 7,676
Securities available for sale | 283,169 | 293,649
Securities held to maturity, Amortized Cost | 206,824 | 211,736
Securities held to maturity, Unrealized Gains | 183 | 23
Securities held to maturity, Unrealized Losses | 4,204 | 6,688
Securities held to maturity, fair value | 202,803 | 205,071
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 240,973 | 258,984
Securities available for sale, Unrealized Gains | 202 | 44
Securities available for sale, Unrealized Losses | 2,366 | 6,325
Securities available for sale | 238,809 | 252,703
Securities held to maturity, Amortized Cost | 11,276 | 11,602
Securities held to maturity, Unrealized Gains | 69 | 8
Securities held to maturity, Unrealized Losses | 114 | 261
Securities held to maturity, fair value | 11,231 | 11,349
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 38,903 | 35,962
Securities available for sale, Unrealized Gains | 86 | 13
Securities available for sale, Unrealized Losses | 634 | 1,275
Securities available for sale | 38,355 | 34,700
Securities held to maturity, Amortized Cost | 4,167 | 4,583
Securities held to maturity, Unrealized Gains | 27 |
Securities held to maturity, Unrealized Losses | 109 | 193
Securities held to maturity, fair value | 4,085 | 4,390
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 5,103 | 5,364
Securities available for sale, Unrealized Gains | 22 | 21
Securities available for sale, Unrealized Losses | 5 | 76
Securities available for sale | 5,120 | 5,309
Securities held to maturity, Amortized Cost | 39,844 | 37,450
Securities held to maturity, Unrealized Gains | 50 | 14
Securities held to maturity, Unrealized Losses | 520 | 923
Securities held to maturity, fair value | $ 39,374 | $ 36,541

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