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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 3,745,002 | $ 2,327,716
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 273,460 | 40,085
Available for sale, Losses 12 months or longer, Fair Value | 1,857,828 | 1,573,943
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 307,246 | 67,562
Available for sale, Total, Fair Value | 5,602,830 | 3,901,659
Available for sale, Total, Gross Unrealized Losses | 580,706 | 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 | 9,064 | 198,318
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 972 | 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 | 9,064 | 261,852
Available for sale, Total, Gross Unrealized Losses | 972 | 5,340
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 180,505 | 43,021
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,080 | 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 | 180,505 | 68,147
Available for sale, Total, Gross Unrealized Losses | 3,080 | 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 | 1,373,018 | 1,293,179
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 101,020 | 20,581
Available for sale, Losses 12 months or longer, Fair Value | 1,095,567 | 819,596
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 194,464 | 29,541
Available for sale, Total, Fair Value | 2,468,585 | 2,112,775
Available for sale, Total, Gross Unrealized Losses | 295,484 | 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 | 2,080,940 | 786,206
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 163,555 | 14,819
Available for sale, Losses 12 months or longer, Fair Value | 760,822 | 665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 112,721 | 33,796
Available for sale, Total, Fair Value | 2,841,762 | 1,451,893
Available for sale, Total, Gross Unrealized Losses | 276,276 | 48,615
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 83,038 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,771 |
Available for sale, Total, Fair Value | 83,038 |
Available for sale, Total, Gross Unrealized Losses | 3,771 |
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 18,437 | 6,992
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 1,062 | 8
Available for sale, Losses 12 months or longer, Fair Value | 1,439 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 61 |
Available for sale, Total, Fair Value | 19,876 | 6,992
Available for sale, Total, Gross Unrealized Losses | $ 1,123 | $ 8

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