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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 1,491,589 | $ 332,659
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 57,435 | 1,929
Held to maturity, Losses 12 months or longer, Fair Value | 131,273 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 9,623 | 464
Held to maturity, Total, Fair Value | 1,622,862 | 344,496
Held to maturity, Total, Gross Unrealized Losses | 67,058 | 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 | 282,780 | 14,837
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 11,386 | 20
Held to maturity, Losses 12 months or longer, Fair Value | 70,808 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 3,360 |
Held to maturity, Total, Fair Value | 353,588 | 14,837
Held to maturity, Total, Gross Unrealized Losses | 14,746 | 20
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 124,523 | 7,795
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 3,410 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 42,807 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 4,082 |
Held to maturity, Total, Fair Value | 167,330 | 7,795
Held to maturity, Total, Gross Unrealized Losses | 7,492 | 205
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 482,145 | 253,661
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 22,993 | 1,499
Held to maturity, Losses 12 months or longer, Fair Value | 6,727 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 820 |
Held to maturity, Total, Fair Value | 488,872 | 253,661
Held to maturity, Total, Gross Unrealized Losses | 23,813 | 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 | 551,422 | 56,366
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 18,637 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 10,931 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 1,361 | 464
Held to maturity, Total, Fair Value | 562,353 | 68,203
Held to maturity, Total, Gross Unrealized Losses | 19,998 | $ 669
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 50,719 |
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 1,009 |
Held to maturity, Total, Fair Value | 50,719 |
Held to maturity, Total, Gross Unrealized Losses | $ 1,009 |

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