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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | $ 232,874 | $ 2,475,872
Available for sale, Losses less than 12 months, Gross unrealized losses | 6,168 | 173,301
Available for sale, Losses 12 months or longer, Fair value | 4,951,107 | 3,007,890
Available for sale, Losses 12 months or longer, Gross unrealized losses | 891,053 | 583,187
Available for sale, Total, Fair value | 5,183,981 | 5,483,762
Available for sale, Total, Gross unrealized losses | 897,221 | 756,488
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 | 73,033 | 102,607
Available for sale, Losses less than 12 months, Gross unrealized losses | 1,111 | 754
Available for sale, Losses 12 months or longer, Fair value | 41,157 | 8,258
Available for sale, Losses 12 months or longer, Gross unrealized losses | 2,907 | 1,592
Available for sale, Total, Fair value | 114,190 | 110,865
Available for sale, Total, Gross unrealized losses | 4,018 | 2,346
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 68,720 | 192,334
Available for sale, Losses less than 12 months, Gross unrealized losses | 3,138 | 3,981
Available for sale, Losses 12 months or longer, Fair value | 123,078 | 0
Available for sale, Losses 12 months or longer, Gross unrealized losses | 8,240 | 0
Available for sale, Total, Fair value | 191,798 | 192,334
Available for sale, Total, Gross unrealized losses | 11,378 | 3,981
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 7,389 | 636,060
Available for sale, Losses less than 12 months, Gross unrealized losses | 196 | 49,790
Available for sale, Losses 12 months or longer, Fair value | 1,950,817 | 1,611,832
Available for sale, Losses 12 months or longer, Gross unrealized losses | 463,486 | 348,829
Available for sale, Total, Fair value | 1,958,206 | 2,247,892
Available for sale, Total, Gross unrealized losses | 463,682 | 398,619
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 83,732 | 1,489,974
Available for sale, Losses less than 12 months, Gross unrealized losses | 1,723 | 114,195
Available for sale, Losses 12 months or longer, Fair value | 2,757,618 | 1,351,530
Available for sale, Losses 12 months or longer, Gross unrealized losses | 407,156 | 228,685
Available for sale, Total, Fair value | 2,841,350 | 2,841,504
Available for sale, Total, Gross unrealized losses | 408,879 | 342,880
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value |  | 41,703
Available for sale, Losses less than 12 months, Gross unrealized losses |  | 3,275
Available for sale, Losses 12 months or longer, Fair value | 58,830 | 28,884
Available for sale, Losses 12 months or longer, Gross unrealized losses | 5,871 | 2,967
Available for sale, Total, Fair value | 58,830 | 70,587
Available for sale, Total, Gross unrealized losses | 5,871 | 6,242
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value |  | 13,194
Available for sale, Losses less than 12 months, Gross unrealized losses |  | 1,306
Available for sale, Losses 12 months or longer, Fair value | 19,607 | 7,386
Available for sale, Losses 12 months or longer, Gross unrealized losses | 3,393 | 1,114
Available for sale, Total, Fair value | 19,607 | 20,580
Available for sale, Total, Gross unrealized losses | $ 3,393 | $ 2,420

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