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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 3,301,410 | $ 2,327,716
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 161,570 | 40,085
Available for sale, Losses 12 months or longer, Fair Value | 1,997,511 | 1,573,943
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 234,121 | 67,562
Available for sale, Total, Fair Value | 5,298,921 | 3,901,659
Available for sale, Total, Gross Unrealized Losses | 395,691 | 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 | 9,631 | 198,318
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 406 | 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 | 9,631 | 261,852
Available for sale, Total, Gross Unrealized Losses | 406 | 5,340
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 63,349 | 43,021
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 519 | 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 | 63,349 | 68,147
Available for sale, Total, Gross Unrealized Losses | 519 | 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 | 1,359,065 | 1,293,179
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 65,035 | 20,581
Available for sale, Losses 12 months or longer, Fair Value | 1,195,222 | 819,596
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 128,076 | 29,541
Available for sale, Total, Fair Value | 2,554,287 | 2,112,775
Available for sale, Total, Gross Unrealized Losses | 193,111 | 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 | 1,762,250 | 786,206
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 91,931 | 14,819
Available for sale, Losses 12 months or longer, Fair Value | 802,289 | 665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 106,045 | 33,796
Available for sale, Total, Fair Value | 2,564,539 | 1,451,893
Available for sale, Total, Gross Unrealized Losses | 197,976 | 48,615
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 91,220 |
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 3,074 |
Available for sale, Total, Fair Value | 91,220 |
Available for sale, Total, Gross Unrealized Losses | 3,074 |
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 15,895 | 6,992
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 605 | 8
Available for sale, Total, Fair Value | 15,895 | 6,992
Available for sale, Total, Gross Unrealized Losses | $ 605 | $ 8

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