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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 58,524 | $ 82,743
AFS, Less than 12 months, Unrealized Losses | 549 | 675
AFS, 12 months or more, Estimated Fair Value | 463,853 | 541,391
AFS, 12 months or more, Unrealized Losses | 59,949 | 57,129
AFS, Total Estimated Fair Value | 522,377 | 624,134
AFS, Total Unrealized Losses | 60,498 | 57,804
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 4,040 | 63,198
AFS, Less than 12 months, Unrealized Losses | 13 | 220
AFS, 12 months or more, Estimated Fair Value | 189,863 | 152,854
AFS, 12 months or more, Unrealized Losses | 18,414 | 16,046
AFS, Total Estimated Fair Value | 193,903 | 216,052
AFS, Total Unrealized Losses | 18,427 | 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 | 36,831 | 0
AFS, Less than 12 months, Unrealized Losses | 186 | 0
AFS, 12 months or more, Estimated Fair Value | 142,992 | 157,799
AFS, 12 months or more, Unrealized Losses | 32,261 | 30,508
AFS, Total Estimated Fair Value | 179,823 | 157,799
AFS, Total Unrealized Losses | 32,447 | 30,508
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 17,653 | 19,545
AFS, Less than 12 months, Unrealized Losses | 350 | 455
AFS, 12 months or more, Estimated Fair Value | 82,255 | 82,795
AFS, 12 months or more, Unrealized Losses | 8,715 | 8,314
AFS, Total Estimated Fair Value | 99,908 | 102,340
AFS, Total Unrealized Losses | 9,065 | 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 | 9,973 | 108,721
AFS, 12 months or more, Unrealized Losses | 19 | 1,115
AFS, Total Estimated Fair Value | 9,973 | 108,721
AFS, Total Unrealized Losses | 19 | 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 | 38,770 | 39,222
AFS, 12 months or more, Unrealized Losses | 540 | 1,146
AFS, Total Estimated Fair Value | 38,770 | 39,222
AFS, Total Unrealized Losses | $ 540 | $ 1,146

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