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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | $ 581,552 | $ 52,894
Available for sale, Losses less than 12 months, Gross unrealized losses | 2,591 | 399
Available for sale, Losses 12 months or longer, Fair value | 4,085,096 | 4,223,749
Available for sale, Losses 12 months or longer, Gross unrealized losses | 641,322 | 592,694
Available for sale, Total, Fair value | 4,666,648 | 4,276,643
Available for sale, Total, Gross unrealized losses | 643,913 | 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 | 77,053 |
Available for sale, Losses less than 12 months, Gross unrealized losses | 98 |
Available for sale, Losses 12 months or longer, Fair value | 7,442 | 7,790
Available for sale, Losses 12 months or longer, Gross unrealized losses | 1,659 | 1,514
Available for sale, Total, Fair value | 84,495 | 7,790
Available for sale, Total, Gross unrealized losses | 1,757 | 1,514
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 21,941 | 49,832
Available for sale, Losses less than 12 months, Gross unrealized losses | 400 | 374
Available for sale, Losses 12 months or longer, Fair value | 174,531 | 128,965
Available for sale, Losses 12 months or longer, Gross unrealized losses | 5,022 | 1,826
Available for sale, Total, Fair value | 196,472 | 178,797
Available for sale, Total, Gross unrealized losses | 5,422 | 2,200
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 397,674 | 3,062
Available for sale, Losses less than 12 months, Gross unrealized losses | 1,359 | 25
Available for sale, Losses 12 months or longer, Fair value | 1,656,654 | 1,795,154
Available for sale, Losses 12 months or longer, Gross unrealized losses | 360,549 | 329,254
Available for sale, Total, Fair value | 2,054,328 | 1,798,216
Available for sale, Total, Gross unrealized losses | 361,908 | 329,279
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 82,884 |
Available for sale, Losses less than 12 months, Gross unrealized losses | 734 |
Available for sale, Losses 12 months or longer, Fair value | 2,188,381 | 2,227,703
Available for sale, Losses 12 months or longer, Gross unrealized losses | 268,205 | 253,576
Available for sale, Total, Fair value | 2,271,265 | 2,227,703
Available for sale, Total, Gross unrealized losses | 268,939 | 253,576
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses 12 months or longer, Fair value | 39,353 | 44,285
Available for sale, Losses 12 months or longer, Gross unrealized losses | 3,122 | 3,376
Available for sale, Total, Fair value | 39,353 | 44,285
Available for sale, Total, Gross unrealized losses | 3,122 | 3,376
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 2,000 |
Available for sale, Losses 12 months or longer, Fair value | 18,735 | 19,852
Available for sale, Losses 12 months or longer, Gross unrealized losses | 2,765 | 3,148
Available for sale, Total, Fair value | 20,735 | 19,852
Available for sale, Total, Gross unrealized losses | $ 2,765 | $ 3,148

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