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Investment in Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 681,825 | $ 684,917
Gross Unrealized Gains | 33 | 4
Gross Unrealized Losses | (59,929) | (57,804)
Fair Value | 621,929 | 627,117
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 599,324 | 624,134
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 59,929 | 57,804
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 227,068 | 235,297
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | (17,370) | (16,266)
Fair Value | 209,704 | 219,035
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 202,143 | 216,052
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 17,370 | 16,266
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 208,586 | 188,307
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (32,218) | (30,508)
Fair Value | 176,368 | 157,799
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 176,368 | 157,799
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 32,218 | 30,508
Corporate bonds |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 119,048 | 111,109
Gross Unrealized Gains | 27 | 0
Gross Unrealized Losses | (9,162) | (8,769)
Fair Value | 109,913 | 102,340
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
Debt Securities, Available-for-sale, Unrealized Loss Position | 94,869 | 102,340
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 9,162 | 8,769
Treasury securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 84,922 | 109,836
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (400) | (1,115)
Fair Value | 84,522 | 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 | 84,522 | 108,721
AFS, 12 months or more, Unrealized Losses | 400 | 1,115
Debt Securities, Available-for-sale, Unrealized Loss Position | 84,522 | 108,721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 400 | 1,115
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 42,201 | 40,368
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (779) | (1,146)
Fair Value | 41,422 | 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 | 41,422 | 39,222
AFS, 12 months or more, Unrealized Losses | 779 | 1,146
Debt Securities, Available-for-sale, Unrealized Loss Position | 41,422 | 39,222
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 779 | $ 1,146

X
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