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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,139,189 | $ 1,187,499
Securities Available-for-Sale, Total Fair value | 1,184,399 | 1,209,701
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 836,860 | 884,571
Securities Available-for-Sale, Total Fair value | $ 863,633 | 889,210
Available for Sale Securities Weighted Avg Yield | 2.39% |
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | $ 38,050 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 40,271 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 3.80% |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | $ 264,279 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | $ 280,495 |
Debt Securities, Available-for-sale, Maturity, after 10 Years, Weighted Average Yield | 3.66% |
Debt Securities, Available-for-sale, Amortized Cost | $ 302,329 | 302,928
Securities Available-for-Sale, Total Fair value | $ 320,766 | $ 320,491
Available for Sale Securities Weighted Avg Yield | 3.68% |

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