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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | $ 50,829 | $ 109,688
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 30 | 1,291
Held to Maturity, Losses 12 months or longer, Fair Value | 1,872,791 | 2,100,656
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 133,839 | 201,015
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 1,923,620 | 2,210,344
Held to Maturity, Total, Gross Unrealized Losses | 133,869 | 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 | 0 | 27,660
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 0 | 840
Held to Maturity, Losses 12 months or longer, Fair Value | 328,482 | 321,154
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 32,414 | 45,036
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 328,482 | 348,814
Held to Maturity, Total, Gross Unrealized Losses | 32,414 | 45,876
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 50,829 | 82,028
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 30 | 451
Held to Maturity, Losses 12 months or longer, Fair Value | 360,613 | 497,999
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 12,176 | 20,416
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 411,442 | 580,027
Held to Maturity, Total, Gross Unrealized Losses | 12,206 | 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 | 477,676 | 511,531
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 38,581 | 61,525
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 477,676 | 511,531
Held to Maturity, Total, Gross Unrealized Losses | 38,581 | 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 | 685,944 | 745,750
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 50,025 | 72,854
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 685,944 | 745,750
Held to Maturity, Total, Gross Unrealized Losses | 50,025 | 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 | 20,076 | 24,222
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 643 | 1,184
Held To Maturity Securities Unrealized Loss Position Fair Value, Total | 20,076 | 24,222
Held to Maturity, Total, Gross Unrealized Losses | $ 643 | $ 1,184

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