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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 2,215,103 | $ 448,456
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 23,673 | 2,396
Available for sale, Losses 12 months or longer, Fair Value | 2,253,030 | 3,778,408
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 304,709 | 403,006
Available for sale, Total, Fair Value | 4,468,133 | 4,226,864
Available for sale, Total, Gross Unrealized Losses | 328,382 | 405,402
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 | 11,910 | 17,468
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 101 | 9
Available for sale, Losses 12 months or longer, Fair Value | 6,708 | 14,677
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,074 | 1,189
Available for sale, Total, Fair Value | 18,618 | 32,145
Available for sale, Total, Gross Unrealized Losses | 1,175 | 1,198
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 47,068 | 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 400 | 0
Available for sale, Losses 12 months or longer, Fair Value | 95,944 | 124,852
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 292 | 508
Available for sale, Total, Fair Value | 143,012 | 124,852
Available for sale, Total, Gross Unrealized Losses | 692 | 508
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 395,000 | 54,250
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,778 | 598
Available for sale, Losses 12 months or longer, Fair Value | 1,283,981 | 1,442,746
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 236,538 | 256,396
Available for sale, Total, Fair Value | 1,678,981 | 1,496,996
Available for sale, Total, Gross Unrealized Losses | 240,316 | 256,994
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 1,758,136 | 374,740
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 19,383 | 1,787
Available for sale, Losses 12 months or longer, Fair Value | 829,335 | 2,158,865
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 64,869 | 143,081
Available for sale, Total, Fair Value | 2,587,471 | 2,533,605
Available for sale, Total, Gross Unrealized Losses | 84,252 | 144,868
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 0 | 0
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 0 | 0
Available for sale, Losses 12 months or longer, Fair Value | 23,814 | 25,946
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,184 | 1,154
Available for sale, Total, Fair Value | 23,814 | 25,946
Available for sale, Total, Gross Unrealized Losses | 1,184 | 1,154
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,989 | 1,998
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 11 | 2
Available for sale, Losses 12 months or longer, Fair Value | 13,248 | 11,322
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 752 | 678
Available for sale, Total, Fair Value | 16,237 | 13,320
Available for sale, Total, Gross Unrealized Losses | $ 763 | $ 680

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