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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 980,047 | $ 1,187,499
Securities Available-for-Sale, Total Fair value | 1,032,814 | 1,209,701
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 698,237 | 884,571
Securities Available-for-Sale, Total Fair value | $ 726,297 | 889,210
Available for Sale Securities Weighted Avg Yield | 2.37% |
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 | $ 58,800 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 64,264 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 3.81% |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | $ 221,010 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | $ 240,242 |
Debt Securities, Available-for-sale, Maturity, after 10 Years, Weighted Average Yield | 3.67% |
Debt Securities, Available-for-sale, Amortized Cost | $ 279,810 | 302,928
Securities Available-for-Sale, Total Fair value | $ 304,506 | $ 320,491
Available for Sale Securities Weighted Avg Yield | 3.70% |
Corporate Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | $ 2,000 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 2,011 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 4.00% |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,000 |
Securities Available-for-Sale, Total Fair value | $ 2,011 |

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