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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | $ 2,570,622 | $ 2,684,779
Securities Held to Maturity, Gross unrealized gains | 388 | 1,431
Securities Held to Maturity, Gross unrealized losses | 223,053 | 200,292
Securities Held to Maturity, Fair value | 2,347,957 | 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 | 404,468 | 413,490
Securities Held to Maturity, Gross unrealized gains | 19 | 179
Securities Held to Maturity, Gross unrealized losses | 48,562 | 43,971
Securities Held to Maturity, Fair value | 355,925 | 369,698
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 630,812 | 664,488
Securities Held to Maturity, Gross unrealized gains | 369 | 1,252
Securities Held to Maturity, Gross unrealized losses | 25,348 | 19,593
Securities Held to Maturity, Fair value | 605,833 | 646,147
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 614,200 | 654,262
Securities Held to Maturity, Gross unrealized losses | 65,661 | 59,223
Securities Held to Maturity, Fair value | 548,539 | 595,039
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 892,436 | 920,048
Securities Held to Maturity, Gross unrealized losses | 81,803 | 75,803
Securities Held to Maturity, Fair value | 810,633 | 844,245
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 28,706 | 32,491
Securities Held to Maturity, Gross unrealized losses | 1,679 | 1,702
Securities Held to Maturity, Fair value | $ 27,027 | $ 30,789

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