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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 49,398 | $ 52,894
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 89 | 399
Available for sale, Losses 12 months or longer, Fair Value | 4,161,282 | 4,223,749
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 473,428 | 592,694
Available for sale, Total, Fair Value | 4,210,680 | 4,276,643
Available for sale, Total, Gross Unrealized Losses | 473,517 | 593,093
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 | 7,982 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 17 |
Available for sale, Losses 12 months or longer, Fair Value | 7,545 | 7,790
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,354 | 1,514
Available for sale, Total, Fair Value | 15,527 | 7,790
Available for sale, Total, Gross Unrealized Losses | 1,371 | 1,514
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,820 | 49,832
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 0 | 374
Available for sale, Losses 12 months or longer, Fair Value | 174,748 | 128,965
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,824 | 1,826
Available for sale, Total, Fair Value | 177,568 | 178,797
Available for sale, Total, Gross Unrealized Losses | 1,824 | 2,200
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 38,596 | 3,062
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 72 | 25
Available for sale, Losses 12 months or longer, Fair Value | 1,674,765 | 1,795,154
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 280,324 | 329,254
Available for sale, Total, Fair Value | 1,713,361 | 1,798,216
Available for sale, Total, Gross Unrealized Losses | 280,396 | 329,279
Commercial Mortgage-Backed Securities [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 | 2,246,784 | 2,227,703
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 185,916 | 253,576
Available for sale, Total, Fair Value | 2,246,784 | 2,227,703
Available for sale, Total, Gross Unrealized Losses | 185,916 | 253,576
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses 12 months or longer, Fair Value | 37,986 | 44,285
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,964 | 3,376
Available for sale, Total, Fair Value | 37,986 | 44,285
Available for sale, Total, Gross Unrealized Losses | 1,964 | 3,376
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 0 |
Available for sale, Losses 12 months or longer, Fair Value | 19,454 | 19,852
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 2,046 | 3,148
Available for sale, Total, Fair Value | 19,454 | 19,852
Available for sale, Total, Gross Unrealized Losses | $ 2,046 | $ 3,148

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