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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | $ 85,153 | $ 109,688
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 191 | 1,291
Held to Maturity, Losses 12 months or longer, Fair Value | 1,953,443 | 2,100,656
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 148,401 | 201,015
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 2,038,596 | 2,210,344
Held to Maturity, Total, Gross Unrealized Losses | 148,592 | 202,306
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 | 8,823 | 27,660
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 86 | 840
Held to Maturity, Losses 12 months or longer, Fair Value | 321,522 | 321,154
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 34,857 | 45,036
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 330,345 | 348,814
Held to Maturity, Total, Gross Unrealized Losses | 34,943 | 45,876
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 76,330 | 82,028
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 105 | 451
Held to Maturity, Losses 12 months or longer, Fair Value | 432,533 | 497,999
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 14,984 | 20,416
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 508,863 | 580,027
Held to Maturity, Total, Gross Unrealized Losses | 15,089 | 20,867
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value |  | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses |  | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 491,949 | 511,531
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 42,703 | 61,525
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 491,949 | 511,531
Held to Maturity, Total, Gross Unrealized Losses | 42,703 | 61,525
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value |  | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses |  | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 686,054 | 745,750
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 55,032 | 72,854
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 686,054 | 745,750
Held to Maturity, Total, Gross Unrealized Losses | 55,032 | 72,854
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value |  | 0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses |  | 0
Held to Maturity, Losses 12 months or longer, Fair Value | 21,385 | 24,222
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 825 | 1,184
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 21,385 | 24,222
Held to Maturity, Total, Gross Unrealized Losses | $ 825 | $ 1,184

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