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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | $ 110,224 | $ 98,559
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 329 | 97
Held to Maturity, Losses 12 months or longer, Fair Value | 1,625,308 | 1,808,602
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 125,211 | 122,715
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 1,735,532 | 1,907,161
Held to Maturity, Total, Gross Unrealized Losses | 125,540 | 122,812
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 8,563 | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 24 | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 313,146 | 316,814
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 29,147 | 30,143
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 321,709 | 316,814
Held to Maturity, Total, Gross Unrealized Losses | 29,171 | 30,143
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 101,661 | 98,559
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 305 | 97
Held to Maturity, Losses 12 months or longer, Fair Value | 171,360 | 325,241
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 11,251 | 11,358
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 273,021 | 423,800
Held to Maturity, Total, Gross Unrealized Losses | 11,556 | 11,455
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 0 | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 0 | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 444,485 | 463,099
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 35,764 | 34,239
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 444,485 | 463,099
Held to Maturity, Total, Gross Unrealized Losses | 35,764 | 34,239
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 0 | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 0 | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 679,494 | 684,874
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 48,510 | 46,455
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 679,494 | 684,874
Held to Maturity, Total, Gross Unrealized Losses | 48,510 | 46,455
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 0 | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 0 | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 16,823 | 18,574
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 539 | 520
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 16,823 | 18,574
Held to Maturity, Total, Gross Unrealized Losses | $ 539 | $ 520

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