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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | $ 98,160 | $ 109,688
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 338 | 1,291
Held to Maturity, Losses 12 months or longer, Fair Value | 2,065,994 | 2,100,656
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 165,758 | 201,015
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 2,164,154 | 2,210,344
Held to Maturity, Total, Gross Unrealized Losses | 166,096 | 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 | 9,196 | 27,660
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 36 | 840
Held to Maturity, Losses 12 months or longer, Fair Value | 324,368 | 321,154
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 37,252 | 45,036
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 333,564 | 348,814
Held to Maturity, Total, Gross Unrealized Losses | 37,288 | 45,876
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 88,964 | 82,028
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 302 | 451
Held to Maturity, Losses 12 months or longer, Fair Value | 468,359 | 497,999
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 17,093 | 20,416
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 557,323 | 580,027
Held to Maturity, Total, Gross Unrealized Losses | 17,395 | 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 | 504,809 | 511,531
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 49,163 | 61,525
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 504,809 | 511,531
Held to Maturity, Total, Gross Unrealized Losses | 49,163 | 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 | 745,658 | 745,750
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 61,296 | 72,854
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 745,658 | 745,750
Held to Maturity, Total, Gross Unrealized Losses | 61,296 | 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 | 22,800 | 24,222
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 954 | 1,184
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 22,800 | 24,222
Held to Maturity, Total, Gross Unrealized Losses | $ 954 | $ 1,184

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