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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | $ 2,200,703 | $ 332,659
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 188,978 | 1,929
Held to maturity, Losses 12 months or longer, Fair Value | 401,589 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 71,313 | 464
Held to maturity, Total, Fair Value | 2,602,292 | 344,496
Held to maturity, Total, Gross Unrealized Losses | 260,291 | 2,393
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 168,514 | 14,837
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 19,895 | 20
Held to maturity, Losses 12 months or longer, Fair Value | 189,879 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 28,808 |
Held to maturity, Total, Fair Value | 358,393 | 14,837
Held to maturity, Total, Gross Unrealized Losses | 48,703 | 20
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 601,010 | 7,795
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 21,670 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 58,691 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 16,218 |
Held to maturity, Total, Fair Value | 659,701 | 7,795
Held to maturity, Total, Gross Unrealized Losses | 37,888 | 205
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 574,671 | 253,661
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 65,187 | 1,499
Held to maturity, Losses 12 months or longer, Fair Value | 98,695 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 16,653 |
Held to maturity, Total, Fair Value | 673,366 | 253,661
Held to maturity, Total, Gross Unrealized Losses | 81,840 | 1,499
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 810,889 | 56,366
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 79,651 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 54,324 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 9,634 | 464
Held to maturity, Total, Fair Value | 865,213 | 68,203
Held to maturity, Total, Gross Unrealized Losses | 89,285 | $ 669
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 45,619 |
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 2,575 |
Held to maturity, Total, Fair Value | 45,619 |
Held to maturity, Total, Gross Unrealized Losses | $ 2,575 |

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