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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 120,480 | $ 97,255
AFS, Less than 12 months, Unrealized Losses | 1,243 | 2,193
AFS, 12 months or more, Estimated Fair Value | 351,106 | 401,004
AFS, 12 months or more, Unrealized Losses | 41,043 | 57,512
AFS, Total Estimated Fair Value | 471,586 | 498,259
AFS, Total Unrealized Losses | 42,286 | 59,705
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 2,814 | 4,082
AFS, Less than 12 months, Unrealized Losses | 16 | 8
AFS, 12 months or more, Estimated Fair Value | 148,209 | 163,893
AFS, 12 months or more, Unrealized Losses | 11,822 | 16,964
AFS, Total Estimated Fair Value | 151,023 | 167,975
AFS, Total Unrealized Losses | 11,838 | 16,972
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 | 117,666 | 85,272
AFS, Less than 12 months, Unrealized Losses | 1,227 | 2,086
AFS, 12 months or more, Estimated Fair Value | 145,446 | 139,676
AFS, 12 months or more, Unrealized Losses | 26,637 | 32,009
AFS, Total Estimated Fair Value | 263,112 | 224,948
AFS, Total Unrealized Losses | 27,864 | 34,095
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 0 | 7,901
AFS, Less than 12 months, Unrealized Losses | 0 | 99
AFS, 12 months or more, Estimated Fair Value | 28,723 | 66,860
AFS, 12 months or more, Unrealized Losses | 2,238 | 7,960
AFS, Total Estimated Fair Value | 28,723 | 74,761
AFS, Total Unrealized Losses | 2,238 | 8,059
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 | 28,728 | 30,575
AFS, 12 months or more, Unrealized Losses | 346 | 579
AFS, Total Estimated Fair Value | 28,728 | 30,575
AFS, Total Unrealized Losses | $ 346 | $ 579

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