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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | $ 2,051,628 | $ 2,132,882
Securities Held to Maturity, Gross Unrealized Gains | 641 | 956
Securities Held to Maturity, Gross Unrealized Losses | 125,540 | 122,812
Securities Held to Maturity, Fair Value | 1,926,729 | 2,011,026
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 368,667 | 373,605
Securities Held to Maturity, Gross Unrealized Gains | 271 | 248
Securities Held to Maturity, Gross Unrealized Losses | 29,171 | 30,143
Securities Held to Maturity, Fair Value | 339,767 | 343,710
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 457,346 | 511,516
Securities Held to Maturity, Gross Unrealized Gains | 370 | 708
Securities Held to Maturity, Gross Unrealized Losses | 11,556 | 11,455
Securities Held to Maturity, Fair Value | 446,160 | 500,769
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 480,249 | 497,338
Securities Held to Maturity, Gross Unrealized Losses | 35,764 | 34,239
Securities Held to Maturity, Fair Value | 444,485 | 463,099
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 728,004 | 731,329
Securities Held to Maturity, Gross Unrealized Losses | 48,510 | 46,455
Securities Held to Maturity, Fair Value | 679,494 | 684,874
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized Cost | 17,362 | 19,094
Securities Held to Maturity, Gross Unrealized Losses | 539 | 520
Securities Held to Maturity, Fair Value | $ 16,823 | $ 18,574

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