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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 35,303 | $ 686,908
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 115 | 8,163
Available for sale, Losses 12 months or longer, Fair Value | 3,972,389 | 3,921,412
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 436,250 | 607,509
Available for sale, Total, Fair Value | 4,007,692 | 4,608,320
Available for sale, Total, Gross Unrealized Losses | 436,365 | 615,672
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 32,243 | 130,453
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 109 | 2,243
Available for sale, Losses 12 months or longer, Fair Value | 14,382 | 7,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,485 | 1,651
Available for sale, Total, Fair Value | 46,625 | 137,700
Available for sale, Total, Gross Unrealized Losses | 1,594 | 3,894
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 0 | 24,149
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 0 | 247
Available for sale, Losses 12 months or longer, Fair Value | 133,878 | 170,110
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 728 | 3,695
Available for sale, Total, Fair Value | 133,878 | 194,259
Available for sale, Total, Gross Unrealized Losses | 728 | 3,942
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 37 | 347,772
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 0 | 2,935
Available for sale, Losses 12 months or longer, Fair Value | 1,515,716 | 1,554,001
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 272,605 | 350,619
Available for sale, Total, Fair Value | 1,515,753 | 1,901,773
Available for sale, Total, Gross Unrealized Losses | 272,605 | 353,554
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 1,023 | 184,534
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 6 | 2,738
Available for sale, Losses 12 months or longer, Fair Value | 2,265,794 | 2,139,191
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 159,148 | 247,854
Available for sale, Total, Fair Value | 2,266,817 | 2,323,725
Available for sale, Total, Gross Unrealized Losses | 159,154 | 250,592
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value |  | 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses |  | 0
Available for sale, Losses 12 months or longer, Fair Value | 28,029 | 35,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,374 | 2,306
Available for sale, Total, Fair Value | 28,029 | 35,247
Available for sale, Total, Gross Unrealized Losses | 1,374 | 2,306
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,000 | 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 0 | 0
Available for sale, Losses 12 months or longer, Fair Value | 14,590 | 15,616
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 910 | 1,384
Available for sale, Total, Fair Value | 16,590 | 15,616
Available for sale, Total, Gross Unrealized Losses | $ 910 | $ 1,384

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