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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 100,694 | $ 352,931
Held to maturity, Losses less than 12 months, Gross unrealized losses | 811 | 1,864
Held to maturity, Losses 12 months or longer, Fair value | 2,313,431 | 2,035,771
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 217,077 | 198,428
Held to maturity, Total, Fair value | 2,414,125 | 2,388,702
Held to maturity, Total, Gross unrealized losses | 217,888 | 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 | 29,579 | 9,530
Held to maturity, Losses less than 12 months, Gross unrealized losses | 316 | 63
Held to maturity, Losses 12 months or longer, Fair value | 331,773 | 339,533
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 47,767 | 43,908
Held to maturity, Total, Fair value | 361,352 | 349,063
Held to maturity, Total, Gross unrealized losses | 48,083 | 43,971
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value | 71,115 | 343,401
Held to maturity, Losses less than 12 months, Gross unrealized losses | 495 | 1,801
Held to maturity, Losses 12 months or longer, Fair value | 544,326 | 226,165
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 22,690 | 17,792
Held to maturity, Total, Fair value | 615,441 | 569,566
Held to maturity, Total, Gross unrealized losses | 23,185 | 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 | 571,669 | 595,039
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 64,540 | 59,223
Held to maturity, Total, Fair value | 571,669 | 595,039
Held to maturity, Total, Gross unrealized losses | 64,540 | 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 | 836,727 | 844,245
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 80,280 | 75,803
Held to maturity, Total, Fair value | 836,727 | 844,245
Held to maturity, Total, Gross unrealized losses | 80,280 | 75,803
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses 12 months or longer, Fair value | 28,936 | 30,789
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 1,800 | 1,702
Held to maturity, Total, Fair value | 28,936 | 30,789
Held to maturity, Total, Gross unrealized losses | $ 1,800 | $ 1,702

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