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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 2,241,804 | $ 332,659
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 120,967 | 1,929
Held to maturity, Losses 12 months or longer, Fair Value | 122,646 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 17,214 | 464
Held to maturity, Total, Fair Value | 2,364,450 | 344,496
Held to maturity, Total, Gross Unrealized Losses | 138,181 | 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 | 274,813 | 14,837
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 21,723 | 20
Held to maturity, Losses 12 months or longer, Fair Value | 66,290 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 6,977 |
Held to maturity, Total, Fair Value | 341,103 | 14,837
Held to maturity, Total, Gross Unrealized Losses | 28,700 | 20
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 418,484 | 7,795
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 10,931 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 39,761 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 7,186 |
Held to maturity, Total, Fair Value | 458,245 | 7,795
Held to maturity, Total, Gross Unrealized Losses | 18,117 | 205
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 653,358 | 253,661
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 42,184 | 1,499
Held to maturity, Losses 12 months or longer, Fair Value | 6,181 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 1,182 |
Held to maturity, Total, Fair Value | 659,539 | 253,661
Held to maturity, Total, Gross Unrealized Losses | 43,366 | 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 | 843,698 | 56,366
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 44,795 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 10,414 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 1,869 | 464
Held to maturity, Total, Fair Value | 854,112 | 68,203
Held to maturity, Total, Gross Unrealized Losses | 46,664 | $ 669
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 51,451 |
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 1,334 |
Held to maturity, Total, Fair Value | 51,451 |
Held to maturity, Total, Gross Unrealized Losses | $ 1,334 |

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