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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, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,237,990 | $ 1,028,883
Securities Available-for-Sale, Total Fair value | 1,260,286 | 1,003,421
Securities Held-to-Maturity, Amortized Cost |  | 351,808
Securities held-to-maturity, fair value |  | 351,422
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 | 3,998 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 4,140 |
Debt Securities, Available-for-sale, Maturity, after Five Through Ten Years, Weighted Average Yield | 3.04% |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | $ 299,524 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | $ 317,765 |
Debt Securities, Available-for-sale, Maturity, after 10 Years, Weighted Average Yield | 3.69% |
Debt Securities, Available-for-sale, Amortized Cost | $ 303,522 |
Securities Available-for-Sale, Total Fair value | $ 321,905 |
Available for Sale Securities Weighted Avg Yield | 3.68% |
Securities Held-to-Maturity, Amortized Cost |  | 305,278
Securities held-to-maturity, fair value |  | 305,808
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 934,468 | 1,028,883
Securities Available-for-Sale, Total Fair value | $ 938,381 | 1,003,421
Available for Sale Securities Weighted Avg Yield | 2.37% |
Securities Held-to-Maturity, Amortized Cost |  | 46,530
Securities held-to-maturity, fair value |  | $ 45,614

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