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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 2,473,633 | $ 2,684,779
Securities Held to Maturity, Gross Unrealized Gains | 1,576 | 1,431
Securities Held to Maturity, Gross Unrealized Losses | 149,951 | 200,292
Securities Held to Maturity, Fair Value | 2,325,258 | 2,485,918
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 400,115 | 413,490
Securities Held to Maturity, Gross Unrealized Gains | 661 | 179
Securities Held to Maturity, Gross Unrealized Losses | 34,673 | 43,971
Securities Held to Maturity, Fair Value | 366,103 | 369,698
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 628,365 | 664,488
Securities Held to Maturity, Gross Unrealized Gains | 915 | 1,252
Securities Held to Maturity, Gross Unrealized Losses | 15,255 | 19,593
Securities Held to Maturity, Fair Value | 614,025 | 646,147
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 593,502 | 654,262
Securities Held to Maturity, Gross Unrealized Losses | 43,613 | 59,223
Securities Held to Maturity, Fair Value | 549,889 | 595,039
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 824,601 | 920,048
Securities Held to Maturity, Gross Unrealized Losses | 55,404 | 75,803
Securities Held to Maturity, Fair Value | 769,197 | 844,245
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 27,050 | 32,491
Securities Held to Maturity, Gross Unrealized Losses | 1,006 | 1,702
Securities Held to Maturity, Fair Value | $ 26,044 | $ 30,789

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