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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | $ 21,719 | $ 352,931
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 53 | 1,864
Held to Maturity, Losses 12 months or longer, Fair Value | 2,179,763 | 2,035,771
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 149,898 | 198,428
Held to Maturity, Total, Fair Value | 2,201,482 | 2,388,702
Held to Maturity, Total, Gross Unrealized Losses | 149,951 | 200,292
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 | 0 | 9,530
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 0 | 63
Held to Maturity, Losses 12 months or longer, Fair Value | 336,218 | 339,533
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 34,673 | 43,908
Held to Maturity, Total, Fair Value | 336,218 | 349,063
Held to Maturity, Total, Gross Unrealized Losses | 34,673 | 43,971
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 21,719 | 343,401
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 53 | 1,801
Held to Maturity, Losses 12 months or longer, Fair Value | 498,414 | 226,165
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 15,202 | 17,792
Held to Maturity, Total, Fair Value | 520,133 | 569,566
Held to Maturity, Total, Gross Unrealized Losses | 15,255 | 19,593
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses 12 months or longer, Fair Value | 549,890 | 595,039
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 43,613 | 59,223
Held to Maturity, Total, Fair Value | 549,890 | 595,039
Held to Maturity, Total, Gross Unrealized Losses | 43,613 | 59,223
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses 12 months or longer, Fair Value | 769,197 | 844,245
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 55,404 | 75,803
Held to Maturity, Total, Fair Value | 769,197 | 844,245
Held to Maturity, Total, Gross Unrealized Losses | 55,404 | 75,803
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses 12 months or longer, Fair Value | 26,044 | 30,789
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 1,006 | 1,702
Held to Maturity, Total, Fair Value | 26,044 | 30,789
Held to Maturity, Total, Gross Unrealized Losses | $ 1,006 | $ 1,702

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