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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, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Amortized cost | $ 1,074,605 | $ 1,097,645
Securities Available-for-Sale, Total Fair value | 1,032,265 | 1,091,881
Securities Held-to-Maturity, Amortized Cost | 350,642 | 357,197
Securities held-to-maturity, fair value | 344,341 | 363,779
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 2,430 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | $ 2,385 |
Held to Maturity Securities weighted avg yield five through ten | 2.97% |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | $ 301,238 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | $ 296,327 |
Held to Maturity Securities Debt Maturities Years Over Ten weighted avg yield | 3.68% |
Securities Held-to-Maturity, Amortized Cost | $ 303,668 | 300,412
Securities held-to-maturity, fair value | $ 298,712 | 306,274
Held to Maturity Securities weighted avg yield | 3.67% |
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Amortized cost |  | 245,000
Securities Available-for-Sale, Total Fair value |  | 242,720
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Amortized cost | $ 1,074,605 | 852,645
Securities Available-for-Sale, Total Fair value | $ 1,032,265 | 849,161
Available for Sale Securities Weighted Avg Yield | 2.35% |
Securities Held-to-Maturity, Amortized Cost | $ 46,974 | 56,785
Securities held-to-maturity, fair value | $ 45,629 | $ 57,505
Held to Maturity Securities weighted avg yield | 2.83% |

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