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Investment Securities (Investments Gross Unrealized Losses And Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, Less than 12 months, Fair Value | $ 74,468 | $ 251
Securities available for sale, Less than 12 months, Unrealized Losses | 605 | 1
Securities available for sale, 12 months or longer, Fair Value | 40,032 | 438,290
Securities available for sale, 12 months or longer, Unrealized Losses | 327 | 10,749
Securities available for sale, Fair Value, Total | 114,500 | 438,541
Securities available for sale, Unrealized Losses, Total | 932 | 10,750
Securities held to maturity, Less than 12 months, Fair Value | 26,272 | 50,519
Securities held to maturity, Less than 12 months, Unrealized Losses | 119 | 181
Securities held to maturity, 12 months or longer, Fair Value | 58,860 | 234,507
Securities held to maturity, 12 months or longer, Unrealized Losses | 642 | 7,718
Securities held to maturity, Fair Value, Total | 85,132 | 285,026
Securities held to maturity, Unrealized Losses, Total | 761 | 7,899
Total Securities, Less than 12 months, Fair Value | 100,740 | 50,770
Total Securities, Less than 12 months, Unrealized Losses | 724 | 182
Total Securities, 12 months or longer, Fair Value | 98,892 | 672,797
Total Securities, 12 months or longer, Unrealized Losses | 969 | 18,467
Total Securities, Fair Value | 199,632 | 723,567
Total Securities, Unrealized Losses | 1,693 | 18,649
U.S. Government Agency And Government Sponsored Enterprises [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, 12 months or longer, Fair Value | 8,986 | 152,028
Securities available for sale, 12 months or longer, Unrealized Losses | 14 | 3,074
Securities available for sale, Fair Value, Total | 8,986 | 152,028
Securities available for sale, Unrealized Losses, Total | 14 | 3,074
State And Political Subdivisions [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities held to maturity, Less than 12 months, Fair Value | 2,011 | 35,751
Securities held to maturity, Less than 12 months, Unrealized Losses | 5 | 91
Securities held to maturity, 12 months or longer, Fair Value |  | 49,534
Securities held to maturity, 12 months or longer, Unrealized Losses |  | 1,120
Securities held to maturity, Fair Value, Total | 2,011 | 85,285
Securities held to maturity, Unrealized Losses, Total | 5 | 1,211
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, Less than 12 months, Fair Value | 5,178 |
Securities available for sale, Less than 12 months, Unrealized Losses | 34 |
Securities available for sale, 12 months or longer, Fair Value | 16 | 56
Securities available for sale, Fair Value, Total | 5,194 | 56
Securities available for sale, Unrealized Losses, Total | 34 |
Securities held to maturity, Less than 12 months, Fair Value | 8,207 |
Securities held to maturity, Less than 12 months, Unrealized Losses | 35 |
Securities held to maturity, 12 months or longer, Fair Value | 23,372 | 57,973
Securities held to maturity, 12 months or longer, Unrealized Losses | 295 | 2,179
Securities held to maturity, Fair Value, Total | 31,579 | 57,973
Securities held to maturity, Unrealized Losses, Total | 330 | 2,179
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, Less than 12 months, Fair Value | 4,966 |
Securities available for sale, Less than 12 months, Unrealized Losses | 17 |
Securities available for sale, 12 months or longer, Fair Value |  | 6
Securities available for sale, Fair Value, Total | 4,966 | 6
Securities available for sale, Unrealized Losses, Total | 17 |
Securities held to maturity, Less than 12 months, Fair Value | 11,631 |
Securities held to maturity, Less than 12 months, Unrealized Losses | 26 |
Securities held to maturity, 12 months or longer, Fair Value | 22,115 | 75,603
Securities held to maturity, 12 months or longer, Unrealized Losses | 235 | 2,597
Securities held to maturity, Fair Value, Total | 33,746 | 75,603
Securities held to maturity, Unrealized Losses, Total | 261 | 2,597
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities held to maturity, Less than 12 months, Fair Value | 3,575 |
Securities held to maturity, Less than 12 months, Unrealized Losses | 52 |
Securities held to maturity, 12 months or longer, Fair Value | 3,875 | 17,263
Securities held to maturity, 12 months or longer, Unrealized Losses | 46 | 535
Securities held to maturity, Fair Value, Total | 7,450 | 17,263
Securities held to maturity, Unrealized Losses, Total | 98 | 535
Mortgage-Backed Securities [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, Less than 12 months, Fair Value | 74,468 | 251
Securities available for sale, Less than 12 months, Unrealized Losses | 605 | 1
Securities available for sale, 12 months or longer, Fair Value | 31,046 | 286,262
Securities available for sale, 12 months or longer, Unrealized Losses | 313 | 7,675
Securities available for sale, Fair Value, Total | 105,514 | 286,513
Securities available for sale, Unrealized Losses, Total | 918 | 7,676
Securities held to maturity, Less than 12 months, Fair Value | 24,261 | 14,768
Securities held to maturity, Less than 12 months, Unrealized Losses | 114 | 90
Securities held to maturity, 12 months or longer, Fair Value | 58,860 | 184,973
Securities held to maturity, 12 months or longer, Unrealized Losses | 642 | 6,598
Securities held to maturity, Fair Value, Total | 83,121 | 199,741
Securities held to maturity, Unrealized Losses, Total | 756 | 6,688
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, Less than 12 months, Fair Value | 63,435 | 251
Securities available for sale, Less than 12 months, Unrealized Losses | 548 | 1
Securities available for sale, 12 months or longer, Fair Value | 21,217 | 247,615
Securities available for sale, 12 months or longer, Unrealized Losses | 140 | 6,324
Securities available for sale, Fair Value, Total | 84,652 | 247,866
Securities available for sale, Unrealized Losses, Total | 688 | 6,325
Securities held to maturity, Less than 12 months, Fair Value |  | 1,518
Securities held to maturity, Less than 12 months, Unrealized Losses |  | 3
Securities held to maturity, 12 months or longer, Fair Value | 1,078 | 8,695
Securities held to maturity, 12 months or longer, Unrealized Losses | 1 | 258
Securities held to maturity, Fair Value, Total | 1,078 | 10,213
Securities held to maturity, Unrealized Losses, Total | 1 | 261
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, Less than 12 months, Fair Value | 889 |
Securities available for sale, Less than 12 months, Unrealized Losses | 6 |
Securities available for sale, 12 months or longer, Fair Value | 9,813 | 33,918
Securities available for sale, 12 months or longer, Unrealized Losses | 173 | 1,275
Securities available for sale, Fair Value, Total | 10,702 | 33,918
Securities available for sale, Unrealized Losses, Total | 179 | 1,275
Securities held to maturity, Less than 12 months, Fair Value |  | 1,467
Securities held to maturity, Less than 12 months, Unrealized Losses |  | 5
Securities held to maturity, 12 months or longer, Fair Value | 2,621 | 2,923
Securities held to maturity, 12 months or longer, Unrealized Losses | 26 | 188
Securities held to maturity, Fair Value, Total | 2,621 | 4,390
Securities held to maturity, Unrealized Losses, Total | 26 | 193
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Schedule of Debt Securities Available For Sale and Held To Maturity Securities [Line Item] |  |
Securities available for sale, 12 months or longer, Fair Value |  | 4,667
Securities available for sale, 12 months or longer, Unrealized Losses |  | 76
Securities available for sale, Fair Value, Total |  | 4,667
Securities available for sale, Unrealized Losses, Total |  | 76
Securities held to maturity, Less than 12 months, Fair Value | 848 | 11,783
Securities held to maturity, Less than 12 months, Unrealized Losses | 1 | 82
Securities held to maturity, 12 months or longer, Fair Value | 5,799 | 22,516
Securities held to maturity, 12 months or longer, Unrealized Losses | 39 | 841
Securities held to maturity, Fair Value, Total | 6,647 | 34,299
Securities held to maturity, Unrealized Losses, Total | $ 40 | $ 923

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