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Investment in Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 601,275 | $ 684,917
Gross Unrealized Gains | 25 | 4
Gross Unrealized Losses | (60,498) | (57,804)
Fair Value | 540,802 | 627,117
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 522,377 | 624,134
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 60,498 | 57,804
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 220,717 | 235,297
Gross Unrealized Gains | 8 | 4
Gross Unrealized Losses | (18,427) | (16,266)
Fair Value | 202,298 | 219,035
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 193,903 | 216,052
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 18,427 | 16,266
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 212,270 | 188,307
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (32,447) | (30,508)
Fair Value | 179,823 | 157,799
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 179,823 | 157,799
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 32,447 | 30,508
Corporate bonds |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 118,986 | 111,109
Gross Unrealized Gains | 17 | 0
Gross Unrealized Losses | (9,065) | (8,769)
Fair Value | 109,938 | 102,340
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 99,908 | 102,340
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 9,065 | 8,769
Treasury securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 9,992 | 109,836
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (19) | (1,115)
Fair Value | 9,973 | 108,721
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 9,973 | 108,721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 19 | 1,115
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 39,310 | 40,368
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (540) | (1,146)
Fair Value | 38,770 | 39,222
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 38,770 | 39,222
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 540 | $ 1,146

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