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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value | $ 62,828 | $ 352,931
Held to maturity, Losses less than 12 months, Gross unrealized losses | 719 | 1,864
Held to maturity, Losses 12 months or longer, Fair value | 2,253,575 | 2,035,771
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 222,334 | 198,428
Held to maturity, Total, Fair value | 2,316,403 | 2,388,702
Held to maturity, Total, Gross unrealized losses | 223,053 | 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 | 10,408 | 9,530
Held to maturity, Losses less than 12 months, Gross unrealized losses | 136 | 63
Held to maturity, Losses 12 months or longer, Fair value | 336,035 | 339,533
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 48,426 | 43,908
Held to maturity, Total, Fair value | 346,443 | 349,063
Held to maturity, Total, Gross unrealized losses | 48,562 | 43,971
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value | 52,420 | 343,401
Held to maturity, Losses less than 12 months, Gross unrealized losses | 583 | 1,801
Held to maturity, Losses 12 months or longer, Fair value | 531,341 | 226,165
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 24,765 | 17,792
Held to maturity, Total, Fair value | 583,761 | 569,566
Held to maturity, Total, Gross unrealized losses | 25,348 | 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 | 548,539 | 595,039
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 65,661 | 59,223
Held to maturity, Total, Fair value | 548,539 | 595,039
Held to maturity, Total, Gross unrealized losses | 65,661 | 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 | 810,633 | 844,245
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 81,803 | 75,803
Held to maturity, Total, Fair value | 810,633 | 844,245
Held to maturity, Total, Gross unrealized losses | 81,803 | 75,803
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses 12 months or longer, Fair value | 27,027 | 30,789
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 1,679 | 1,702
Held to maturity, Total, Fair value | 27,027 | 30,789
Held to maturity, Total, Gross unrealized losses | $ 1,679 | $ 1,702

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