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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 593,004 | $ 2,475,872
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 20,343 | 173,301
Available for sale, Losses 12 months or longer, Fair Value | 4,822,258 | 3,007,890
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 656,545 | 583,187
Available for sale, Total, Fair Value | 5,415,262 | 5,483,762
Available for sale, Total, Gross Unrealized Losses | 676,888 | 756,488
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 49,332 | 102,607
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 382 | 754
Available for sale, Losses 12 months or longer, Fair Value | 8,070 | 8,258
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,406 | 1,592
Available for sale, Total, Fair Value | 57,402 | 110,865
Available for sale, Total, Gross Unrealized Losses | 1,788 | 2,346
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 85,570 | 192,334
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 649 | 3,981
Available for sale, Losses 12 months or longer, Fair Value | 86,444 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,348 |
Available for sale, Total, Fair Value | 172,014 | 192,334
Available for sale, Total, Gross Unrealized Losses | 1,997 | 3,981
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 137,406 | 636,060
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 4,437 | 49,790
Available for sale, Losses 12 months or longer, Fair Value | 2,071,526 | 1,611,832
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 360,474 | 348,829
Available for sale, Total, Fair Value | 2,208,932 | 2,247,892
Available for sale, Total, Gross Unrealized Losses | 364,911 | 398,619
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 318,876 | 1,489,974
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 14,695 | 114,195
Available for sale, Losses 12 months or longer, Fair Value | 2,570,771 | 1,351,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 284,880 | 228,685
Available for sale, Total, Fair Value | 2,889,647 | 2,841,504
Available for sale, Total, Gross Unrealized Losses | 299,575 | 342,880
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [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 | 67,643 | 28,884
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 5,241 | 2,967
Available for sale, Total, Fair Value | 67,643 | 70,587
Available for sale, Total, Gross Unrealized Losses | 5,241 | 6,242
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 1,820 | 13,194
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 180 | 1,306
Available for sale, Losses 12 months or longer, Fair Value | 17,804 | 7,386
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 3,196 | 1,114
Available for sale, Total, Fair Value | 19,624 | 20,580
Available for sale, Total, Gross Unrealized Losses | $ 3,376 | $ 2,420

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