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Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Marketable Securities [Line Items] |  |  |
Available for Sale, Amortized Cost | $ 318,253 | $ 440,358 |
Available for Sale, Gross Unrealized Gains | 1,888 | 2,890 |
Available for Sale, Gross Unrealized Losses | (4,841) | (4,660) |
Available for Sale | 315,300 | 438,588 |
Held to Maturity, Amortized Cost | 11,985,838 | 12,365,308 |
Held to Maturity, Gross Unrealized Gains | 1,152 | 3,995 |
Held to Maturity, Gross Unrealized Losses | (1,508,631) | (1,384,705) |
Held to Maturity | 10,478,359 | 10,984,598 | $ 10,984,598
Corporate Debt Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available for Sale, Amortized Cost | 14,350 | 20,698 |
Available for Sale, Gross Unrealized Gains | 1,830 | 1,827 |
Available for Sale, Gross Unrealized Losses | (335) | (738) |
Available for Sale | 15,845 | 21,787 |
Held to Maturity, Amortized Cost | 12,000 | 12,000 |
Held to Maturity, Gross Unrealized Losses | (3,840) | (4,200) |
Held to Maturity | 8,160 | 7,800 |
Collateralized Mortgage Obligations [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available for Sale, Amortized Cost | 198,180 | 321,881 |
Available for Sale, Gross Unrealized Gains |  | 967 |
Available for Sale, Gross Unrealized Losses | (3,374) | (2,804) |
Available for Sale | 194,806 | 320,044 |
Held to Maturity, Amortized Cost | 256,216 | 263,250 |
Held to Maturity, Gross Unrealized Losses | (25,076) | (20,864) |
Held to Maturity | 231,140 | 242,386 |
Mortgage-backed Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available for Sale, Amortized Cost | 105,723 | 97,779 |
Available for Sale, Gross Unrealized Gains | 58 | 96 |
Available for Sale, Gross Unrealized Losses | (1,132) | (1,118) |
Available for Sale | 104,649 | 96,757 |
Held to Maturity, Amortized Cost | 11,598,232 | 11,965,930 |
Held to Maturity, Gross Unrealized Gains | 388 | 2,131 |
Held to Maturity, Gross Unrealized Losses | (1,477,027) | (1,357,283) |
Held to Maturity | 10,121,593 | 10,610,778 |
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Held to Maturity, Amortized Cost | 7,691 | 7,631 |
Held to Maturity, Gross Unrealized Losses | (107) | (52) |
Held to Maturity | 7,584 | 7,579 |
States and Political Subdivisions [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Held to Maturity, Amortized Cost | 111,699 | 116,497 |
Held to Maturity, Gross Unrealized Gains | 764 | 1,864 |
Held to Maturity, Gross Unrealized Losses | (2,581) | (2,306) |
Held to Maturity | $ 109,882 | $ 116,055 |

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