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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 67,930 | $ 82,743
AFS, Less than 12 months, Unrealized Losses | 657 | 675
AFS, 12 months or more, Estimated Fair Value | 531,394 | 541,391
AFS, 12 months or more, Unrealized Losses | 59,272 | 57,129
AFS, Total Estimated Fair Value | 599,324 | 624,134
AFS, Total Unrealized Losses | 59,929 | 57,804
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 26,244 | 63,198
AFS, Less than 12 months, Unrealized Losses | 164 | 220
AFS, 12 months or more, Estimated Fair Value | 175,899 | 152,854
AFS, 12 months or more, Unrealized Losses | 17,206 | 16,046
AFS, Total Estimated Fair Value | 202,143 | 216,052
AFS, Total Unrealized Losses | 17,370 | 16,266
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 29,086 | 0
AFS, Less than 12 months, Unrealized Losses | 92 | 0
AFS, 12 months or more, Estimated Fair Value | 147,282 | 157,799
AFS, 12 months or more, Unrealized Losses | 32,126 | 30,508
AFS, Total Estimated Fair Value | 176,368 | 157,799
AFS, Total Unrealized Losses | 32,218 | 30,508
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 12,600 | 19,545
AFS, Less than 12 months, Unrealized Losses | 401 | 455
AFS, 12 months or more, Estimated Fair Value | 82,269 | 82,795
AFS, 12 months or more, Unrealized Losses | 8,761 | 8,314
AFS, Total Estimated Fair Value | 94,869 | 102,340
AFS, Total Unrealized Losses | 9,162 | 8,769
Treasury securities |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 0 | 0
AFS, Less than 12 months, Unrealized Losses | 0 | 0
AFS, 12 months or more, Estimated Fair Value | 84,522 | 108,721
AFS, 12 months or more, Unrealized Losses | 400 | 1,115
AFS, Total Estimated Fair Value | 84,522 | 108,721
AFS, Total Unrealized Losses | 400 | 1,115
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 0 | 0
AFS, Less than 12 months, Unrealized Losses | 0 | 0
AFS, 12 months or more, Estimated Fair Value | 41,422 | 39,222
AFS, 12 months or more, Unrealized Losses | 779 | 1,146
AFS, Total Estimated Fair Value | 41,422 | 39,222
AFS, Total Unrealized Losses | $ 779 | $ 1,146

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