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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | $ 3,199,833 | $ 514,805
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 69,992 | 3,727
Available for sale, Losses 12 months or longer, Fair Value | 353,408 | 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 16,111 | 6
Available for sale, Total, Fair Value | 3,553,241 | 515,565
Available for sale, Total, Gross Unrealized Losses | 86,103 | 3,733
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 | 199,451 | 35,845
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,712 | 284
Available for sale, Losses 12 months or longer, Fair Value | 32,489 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,457 |
Available for sale, Total, Fair Value | 231,940 | 35,845
Available for sale, Total, Gross Unrealized Losses | 4,169 | 284
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 43,297 | 30,170
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2,098 | 153
Available for sale, Losses 12 months or longer, Fair Value | 25,243 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 1,080 |
Available for sale, Total, Fair Value | 68,540 | 30,170
Available for sale, Total, Gross Unrealized Losses | 3,178 | 153
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,097,625 | 530
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 42,984 | 2
Available for sale, Losses 12 months or longer, Fair Value | 704 | 760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 4 | 6
Available for sale, Total, Fair Value | 2,098,329 | 1,290
Available for sale, Total, Gross Unrealized Losses | 42,988 | 8
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 856,462 | 446,190
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 22,196 | 3,288
Available for sale, Losses 12 months or longer, Fair Value | 294,972 |
Available for sale, Losses 12 months or longer, Gross Unrealized Losses | 13,570 |
Available for sale, Total, Fair Value | 1,151,434 | 446,190
Available for sale, Total, Gross Unrealized Losses | 35,766 | 3,288
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value |  | 70
Available for sale, Total, Fair Value |  | 70
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale, Losses less than 12 months, Fair Value | 2,998 | 2,000
Available for sale, Losses less than 12 months, Gross Unrealized Losses | 2 |
Available for sale, Total, Fair Value | 2,998 | $ 2,000
Available for sale, Total, Gross Unrealized Losses | $ 2 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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