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Investment Securities (Investments Gross Unrealized Losses And Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 129,206 | $ 251
Securities available for sale, Less than 12 months, Unrealized Losses | 1,367 | 1
Securities available for sale, 12 months or longer, Fair Value | 16,613 | 438,290
Securities available for sale, 12 months or longer, Unrealized Losses | 264 | 10,749
Securities available for sale, Fair Value, Total | 145,819 | 438,541
Securities available for sale, Unrealized Losses, Total | 1,631 | 10,750
Securities held to maturity, Less than 12 months, Fair Value | 49,517 | 50,519
Securities held to maturity, Less than 12 months, Unrealized Losses | 228 | 181
Securities held to maturity, 12 months or longer, Fair Value | 30,589 | 234,507
Securities held to maturity, 12 months or longer, Unrealized Losses | 395 | 7,718
Securities held to maturity, Fair Value, Total | 80,106 | 285,026
Securities held to maturity, Unrealized Losses, Total | 623 | 7,899
Total Securities, Less than 12 months, Fair Value | 178,723 | 50,770
Total Securities, Less than 12 months, Unrealized Losses | 1,595 | 182
Total Securities, 12 months or longer, Fair Value | 47,202 | 672,797
Total Securities, 12 months or longer, Unrealized Losses | 659 | 18,467
Total Securities, Fair Value | 225,925 | 723,567
Total Securities, Unrealized Losses | 2,254 | 18,649
U.S. Government Agencies 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 |  | 152,028
Securities available for sale, 12 months or longer, Unrealized Losses |  | 3,074
Securities available for sale, Fair Value, Total |  | 152,028
Securities available for sale, Unrealized Losses, Total |  | 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 |  | 35,751
Securities held to maturity, Less than 12 months, Unrealized Losses |  | 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 |  | 85,285
Securities held to maturity, Unrealized Losses, Total |  | 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 | 8,803 |
Securities available for sale, Less than 12 months, Unrealized Losses | 57 |
Securities available for sale, 12 months or longer, Fair Value | 8 | 56
Securities available for sale, Fair Value, Total | 8,811 | 56
Securities available for sale, Unrealized Losses, Total | 57 |
Securities held to maturity, Less than 12 months, Fair Value | 9,120 |
Securities held to maturity, Less than 12 months, Unrealized Losses | 40 |
Securities held to maturity, 12 months or longer, Fair Value | 13,486 | 57,973
Securities held to maturity, 12 months or longer, Unrealized Losses | 216 | 2,179
Securities held to maturity, Fair Value, Total | 22,606 | 57,973
Securities held to maturity, Unrealized Losses, Total | 256 | 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 | 4,889 |
Securities available for sale, Less than 12 months, Unrealized Losses | 18 |
Securities available for sale, 12 months or longer, Fair Value |  | 6
Securities available for sale, Fair Value, Total | 4,889 | 6
Securities available for sale, Unrealized Losses, Total | 18 |
Securities held to maturity, Less than 12 months, Fair Value | 15,127 |
Securities held to maturity, Less than 12 months, Unrealized Losses | 30 |
Securities held to maturity, 12 months or longer, Fair Value | 7,988 | 75,603
Securities held to maturity, 12 months or longer, Unrealized Losses | 73 | 2,597
Securities held to maturity, Fair Value, Total | 23,115 | 75,603
Securities held to maturity, Unrealized Losses, Total | 103 | 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 | 8,760 |
Securities held to maturity, Less than 12 months, Unrealized Losses | 72 |
Securities held to maturity, 12 months or longer, Fair Value | 892 | 17,263
Securities held to maturity, 12 months or longer, Unrealized Losses | 11 | 535
Securities held to maturity, Fair Value, Total | 9,652 | 17,263
Securities held to maturity, Unrealized Losses, Total | 83 | 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 | 129,206 | 251
Securities available for sale, Less than 12 months, Unrealized Losses | 1,367 | 1
Securities available for sale, 12 months or longer, Fair Value | 16,613 | 286,262
Securities available for sale, 12 months or longer, Unrealized Losses | 264 | 7,675
Securities available for sale, Fair Value, Total | 145,819 | 286,513
Securities available for sale, Unrealized Losses, Total | 1,631 | 7,676
Securities held to maturity, Less than 12 months, Fair Value | 49,517 | 14,768
Securities held to maturity, Less than 12 months, Unrealized Losses | 228 | 90
Securities held to maturity, 12 months or longer, Fair Value | 30,589 | 184,973
Securities held to maturity, 12 months or longer, Unrealized Losses | 395 | 6,598
Securities held to maturity, Fair Value, Total | 80,106 | 199,741
Securities held to maturity, Unrealized Losses, Total | 623 | 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 | 104,634 | 251
Securities available for sale, Less than 12 months, Unrealized Losses | 1,277 | 1
Securities available for sale, 12 months or longer, Fair Value | 7,196 | 247,615
Securities available for sale, 12 months or longer, Unrealized Losses | 103 | 6,324
Securities available for sale, Fair Value, Total | 111,830 | 247,866
Securities available for sale, Unrealized Losses, Total | 1,380 | 6,325
Securities held to maturity, Less than 12 months, Fair Value | 2,388 | 1,518
Securities held to maturity, Less than 12 months, Unrealized Losses | 6 | 3
Securities held to maturity, 12 months or longer, Fair Value |  | 8,695
Securities held to maturity, 12 months or longer, Unrealized Losses |  | 258
Securities held to maturity, Fair Value, Total | 2,388 | 10,213
Securities held to maturity, Unrealized Losses, Total | 6 | 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 | 10,347 |
Securities available for sale, Less than 12 months, Unrealized Losses | 11 |
Securities available for sale, 12 months or longer, Fair Value | 9,409 | 33,918
Securities available for sale, 12 months or longer, Unrealized Losses | 161 | 1,275
Securities available for sale, Fair Value, Total | 19,756 | 33,918
Securities available for sale, Unrealized Losses, Total | 172 | 1,275
Securities held to maturity, Less than 12 months, Fair Value | 2,967 | 1,467
Securities held to maturity, Less than 12 months, Unrealized Losses | 19 | 5
Securities held to maturity, 12 months or longer, Fair Value | 2,598 | 2,923
Securities held to maturity, 12 months or longer, Unrealized Losses | 28 | 188
Securities held to maturity, Fair Value, Total | 5,565 | 4,390
Securities held to maturity, Unrealized Losses, Total | 47 | 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, Less than 12 months, Fair Value | 533 |
Securities available for sale, Less than 12 months, Unrealized Losses | 4 |
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 | 533 | 4,667
Securities available for sale, Unrealized Losses, Total | 4 | 76
Securities held to maturity, Less than 12 months, Fair Value | 11,155 | 11,783
Securities held to maturity, Less than 12 months, Unrealized Losses | 61 | 82
Securities held to maturity, 12 months or longer, Fair Value | 5,625 | 22,516
Securities held to maturity, 12 months or longer, Unrealized Losses | 67 | 841
Securities held to maturity, Fair Value, Total | 16,780 | 34,299
Securities held to maturity, Unrealized Losses, Total | $ 128 | $ 923

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