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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | $ 625,184 | $ 2,475,872
Available for sale, Losses less than 12 months, Gross unrealized losses | 26,989 | 173,301
Available for sale, Losses 12 months or longer, Fair value | 4,729,305 | 3,007,890
Available for sale, Losses 12 months or longer, Gross unrealized losses | 711,459 | 583,187
Available for sale, Total, Fair value | 5,354,489 | 5,483,762
Available for sale, Total, Gross unrealized losses | 738,448 | 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 | 101,949 | 102,607
Available for sale, Losses less than 12 months, Gross unrealized losses | 1,770 | 754
Available for sale, Losses 12 months or longer, Fair value | 7,903 | 8,258
Available for sale, Losses 12 months or longer, Gross unrealized losses | 1,573 | 1,592
Available for sale, Total, Fair value | 109,852 | 110,865
Available for sale, Total, Gross unrealized losses | 3,343 | 2,346
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 114,411 | 192,334
Available for sale, Losses less than 12 months, Gross unrealized losses | 2,165 | 3,981
Available for sale, Losses 12 months or longer, Fair value | 84,699 |
Available for sale, Losses 12 months or longer, Gross unrealized losses | 2,676 |
Available for sale, Total, Fair value | 199,110 | 192,334
Available for sale, Total, Gross unrealized losses | 4,841 | 3,981
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 131,220 | 636,060
Available for sale, Losses less than 12 months, Gross unrealized losses | 6,308 | 49,790
Available for sale, Losses 12 months or longer, Fair value | 1,989,035 | 1,611,832
Available for sale, Losses 12 months or longer, Gross unrealized losses | 374,811 | 348,829
Available for sale, Total, Fair value | 2,120,255 | 2,247,892
Available for sale, Total, Gross unrealized losses | 381,119 | 398,619
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 275,914 | 1,489,974
Available for sale, Losses less than 12 months, Gross unrealized losses | 16,436 | 114,195
Available for sale, Losses 12 months or longer, Fair value | 2,567,305 | 1,351,530
Available for sale, Losses 12 months or longer, Gross unrealized losses | 322,989 | 228,685
Available for sale, Total, Fair value | 2,843,219 | 2,841,504
Available for sale, Total, Gross unrealized losses | 339,425 | 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 | 62,730 | 28,884
Available for sale, Losses 12 months or longer, Gross unrealized losses | 6,043 | 2,967
Available for sale, Total, Fair value | 62,730 | 70,587
Available for sale, Total, Gross unrealized losses | 6,043 | 6,242
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Available for sale, Losses less than 12 months, Fair value | 1,690 | 13,194
Available for sale, Losses less than 12 months, Gross unrealized losses | 310 | 1,306
Available for sale, Losses 12 months or longer, Fair value | 17,633 | 7,386
Available for sale, Losses 12 months or longer, Gross unrealized losses | 3,367 | 1,114
Available for sale, Total, Fair value | 19,323 | 20,580
Available for sale, Total, Gross unrealized losses | $ 3,677 | $ 2,420

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