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Investment Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 82,743 | $ 456,451
AFS, Less than 12 Months, Unrealized Losses | 675 | 22,374
AFS, 12 months or more, Estimated Fair Value | 541,391 | 260,284
AFS, 12 months or more, Unrealized Losses | 57,129 | 48,259
AFS, Total Estimated Fair Value | 624,134 | 716,735
AFS, Total Unrealized Losses | 57,804 | 70,633
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 63,198 | 214,919
AFS, Less than 12 Months, Unrealized Losses | 220 | 8,958
AFS, 12 months or more, Estimated Fair Value | 152,854 | 47,474
AFS, 12 months or more, Unrealized Losses | 16,046 | 13,346
AFS, Total Estimated Fair Value | 216,052 | 262,393
AFS, Total Unrealized Losses | 16,266 | 22,304
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 | 0 | 53,732
AFS, Less than 12 Months, Unrealized Losses | 0 | 6,135
AFS, 12 months or more, Estimated Fair Value | 157,799 | 118,017
AFS, 12 months or more, Unrealized Losses | 30,508 | 25,101
AFS, Total Estimated Fair Value | 157,799 | 171,749
AFS, Total Unrealized Losses | 30,508 | 31,236
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 19,545 | 32,517
AFS, Less than 12 Months, Unrealized Losses | 455 | 3,629
AFS, 12 months or more, Estimated Fair Value | 82,795 | 47,580
AFS, 12 months or more, Unrealized Losses | 8,314 | 7,622
AFS, Total Estimated Fair Value | 102,340 | 80,097
AFS, Total Unrealized Losses | 8,769 | 11,251
Treasury securities |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 0 | 155,283
AFS, Less than 12 Months, Unrealized Losses | 0 | 3,652
AFS, 12 months or more, Estimated Fair Value | 108,721 | 0
AFS, 12 months or more, Unrealized Losses | 1,115 | 0
AFS, Total Estimated Fair Value | 108,721 | 155,283
AFS, Total Unrealized Losses | 1,115 | 3,652
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 | 39,222 | 47,213
AFS, 12 months or more, Unrealized Losses | 1,146 | 2,190
AFS, Total Estimated Fair Value | 39,222 | 47,213
AFS, Total Unrealized Losses | $ 1,146 | $ 2,190

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