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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | $ 99,040 | $ 52,894
Available for sale, Losses less than 12 months, Gross unrealized losses | 442 | 399
Available for sale, Losses 12 months or longer, Fair value | 4,157,272 | 4,223,749
Available for sale, Losses 12 months or longer, Gross unrealized losses | 634,340 | 592,694
Available for sale, Total, Fair value | 4,256,312 | 4,276,643
Available for sale, Total, Gross unrealized losses | 634,782 | 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 | 11,973 |
Available for sale, Losses less than 12 months, Gross unrealized losses | 27 |
Available for sale, Losses 12 months or longer, Fair value | 7,460 | 7,790
Available for sale, Losses 12 months or longer, Gross unrealized losses | 1,643 | 1,514
Available for sale, Total, Fair value | 19,433 | 7,790
Available for sale, Total, Gross unrealized losses | 1,670 | 1,514
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 19,549 | 49,832
Available for sale, Losses less than 12 months, Gross unrealized losses | 118 | 374
Available for sale, Losses 12 months or longer, Fair value | 176,664 | 128,965
Available for sale, Losses 12 months or longer, Gross unrealized losses | 3,612 | 1,826
Available for sale, Total, Fair value | 196,213 | 178,797
Available for sale, Total, Gross unrealized losses | 3,730 | 2,200
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 31,818 | 3,062
Available for sale, Losses less than 12 months, Gross unrealized losses | 86 | 25
Available for sale, Losses 12 months or longer, Fair value | 1,717,118 | 1,795,154
Available for sale, Losses 12 months or longer, Gross unrealized losses | 356,958 | 329,254
Available for sale, Total, Fair value | 1,748,936 | 1,798,216
Available for sale, Total, Gross unrealized losses | 357,044 | 329,279
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 35,700 |
Available for sale, Losses less than 12 months, Gross unrealized losses | 211 |
Available for sale, Losses 12 months or longer, Fair value | 2,195,760 | 2,227,703
Available for sale, Losses 12 months or longer, Gross unrealized losses | 265,667 | 253,576
Available for sale, Total, Fair value | 2,231,460 | 2,227,703
Available for sale, Total, Gross unrealized losses | 265,878 | 253,576
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses 12 months or longer, Fair value | 41,873 | 44,285
Available for sale, Losses 12 months or longer, Gross unrealized losses | 3,357 | 3,376
Available for sale, Total, Fair value | 41,873 | 44,285
Available for sale, Total, Gross unrealized losses | 3,357 | 3,376
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses 12 months or longer, Fair value | 18,397 | 19,852
Available for sale, Losses 12 months or longer, Gross unrealized losses | 3,103 | 3,148
Available for sale, Total, Fair value | 18,397 | 19,852
Available for sale, Total, Gross unrealized losses | $ 3,103 | $ 3,148

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