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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 402,297 | $ 455,582
Securities available for sale, Unrealized Gains | 4,894 | 845
Securities available for sale, Unrealized Losses | 682 | 10,750
Securities available for sale | 406,509 | 445,677
Securities held to maturity, Amortized Cost | 398,610 | 446,581
Securities held to maturity, Unrealized Gains | 4,349 | 899
Securities held to maturity, Unrealized Losses | 1,554 | 7,899
Securities held to maturity, fair value | 401,405 | 439,581
U.S. Government Agency And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 109,621 | 155,102
Securities available for sale, Unrealized Gains | 1,623 |
Securities available for sale, Unrealized Losses | 58 | 3,074
Securities available for sale | 111,186 | 152,028
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 200,274 | 234,845
Securities held to maturity, Unrealized Gains | 3,527 | 876
Securities held to maturity, Unrealized Losses | 19 | 1,211
Securities held to maturity, fair value | 203,782 | 234,510
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 119 | 133
Securities available for sale, Unrealized Losses | 1 |
Securities available for sale | 118 | 133
Securities held to maturity, Amortized Cost | 56,428 | 62,103
Securities held to maturity, Unrealized Gains | 123 | 1
Securities held to maturity, Unrealized Losses | 592 | 2,179
Securities held to maturity, fair value | 55,959 | 59,925
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 35 | 37
Securities available for sale | 35 | 37
Securities held to maturity, Amortized Cost | 71,293 | 78,200
Securities held to maturity, Unrealized Gains | 272 |
Securities held to maturity, Unrealized Losses | 535 | 2,597
Securities held to maturity, fair value | 71,030 | 75,603
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 15,906 | 17,798
Securities held to maturity, Unrealized Gains | 17 |
Securities held to maturity, Unrealized Losses | 93 | 535
Securities held to maturity, fair value | 15,830 | 17,263
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 690 | 767
Securities available for sale | 690 | 767
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 292,676 | 300,480
Securities available for sale, Unrealized Gains | 3,271 | 845
Securities available for sale, Unrealized Losses | 624 | 7,676
Securities available for sale | 295,323 | 293,649
Securities held to maturity, Amortized Cost | 198,336 | 211,736
Securities held to maturity, Unrealized Gains | 822 | 23
Securities held to maturity, Unrealized Losses | 1,535 | 6,688
Securities held to maturity, fair value | 197,623 | 205,071
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 251,417 | 258,984
Securities available for sale, Unrealized Gains | 2,251 | 44
Securities available for sale, Unrealized Losses | 367 | 6,325
Securities available for sale | 253,301 | 252,703
Securities held to maturity, Amortized Cost | 10,977 | 11,602
Securities held to maturity, Unrealized Gains | 152 | 8
Securities held to maturity, Unrealized Losses | 33 | 261
Securities held to maturity, fair value | 11,096 | 11,349
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 36,290 | 35,962
Securities available for sale, Unrealized Gains | 263 | 13
Securities available for sale, Unrealized Losses | 256 | 1,275
Securities available for sale | 36,297 | 34,700
Securities held to maturity, Amortized Cost | 4,145 | 4,583
Securities held to maturity, Unrealized Gains | 72 |
Securities held to maturity, Unrealized Losses | 65 | 193
Securities held to maturity, fair value | 4,152 | 4,390
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 4,815 | 5,364
Securities available for sale, Unrealized Gains | 67 | 21
Securities available for sale, Unrealized Losses |  | 76
Securities available for sale | 4,882 | 5,309
Securities held to maturity, Amortized Cost | 39,587 | 37,450
Securities held to maturity, Unrealized Gains | 186 | 14
Securities held to maturity, Unrealized Losses | 217 | 923
Securities held to maturity, fair value | $ 39,556 | $ 36,541

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