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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 2,899,532 | $ 2,327,716
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 301,222 | 40,085
Available for sale, Losses 12 months or longer, Fair Value | 2,557,754 | 1,573,943
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 574,651 | 67,562
Available for sale, Total, Fair Value | 5,457,286 | 3,901,659
Available for sale, Total, Gross Unrealized Losses | 875,873 | 107,647
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 | 42,288 | 198,318
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,194 | 2,305
Available for sale, Losses 12 months or longer, Fair Value |  | 63,534
Available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 3,035
Available for sale, Total, Fair Value | 42,288 | 261,852
Available for sale, Total, Gross Unrealized Losses | 2,194 | 5,340
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 196,102 | 43,021
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 10,147 | 2,372
Available for sale, Losses 12 months or longer, Fair Value |  | 25,126
Available for sale, Losses 12 months or longer, Gross Unrealized Losses |  | 1,190
Available for sale, Total, Fair Value | 196,102 | 68,147
Available for sale, Total, Gross Unrealized Losses | 10,147 | 3,562
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 763,658 | 1,293,179
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 76,195 | 20,581
Available for sale, Losses 12 months or longer, Fair Value | 1,535,412 | 819,596
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 355,285 | 29,541
Available for sale, Total, Fair Value | 2,299,070 | 2,112,775
Available for sale, Total, Gross Unrealized Losses | 431,480 | 50,122
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 1,803,019 | 786,206
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 204,268 | 14,819
Available for sale, Losses 12 months or longer, Fair Value | 1,020,901 | 665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 219,307 | 33,796
Available for sale, Total, Fair Value | 2,823,920 | 1,451,893
Available for sale, Total, Gross Unrealized Losses | 423,575 | 48,615
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 75,089 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 6,294 |
Available for sale, Total, Fair Value | 75,089 |
Available for sale, Total, Gross Unrealized Losses | 6,294 |
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 19,376 | 6,992
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,124 | 8
Available for sale, Losses 12 months or longer, Fair Value | 1,441 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 59 |
Available for sale, Total, Fair Value | 20,817 | 6,992
Available for sale, Total, Gross Unrealized Losses | $ 2,183 | $ 8

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