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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 140,412 | $ 456,451
AFS, Less than 12 months, Unrealized Losses | 2,181 | 22,374
AFS, 12 months or more, Estimated Fair Value | 491,101 | 260,284
AFS, 12 months or more, Unrealized Losses | 64,685 | 48,259
AFS, Total Estimated Fair Value | 631,513 | 716,735
AFS, Total Unrealized Losses | 66,866 | 70,633
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 104,329 | 214,919
AFS, Less than 12 months, Unrealized Losses | 1,171 | 8,958
AFS, 12 months or more, Estimated Fair Value | 118,103 | 47,474
AFS, 12 months or more, Unrealized Losses | 18,628 | 13,346
AFS, Total Estimated Fair Value | 222,432 | 262,393
AFS, Total Unrealized Losses | 19,799 | 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 | 11,581 | 53,732
AFS, Less than 12 months, Unrealized Losses | 608 | 6,135
AFS, 12 months or more, Estimated Fair Value | 152,271 | 118,017
AFS, 12 months or more, Unrealized Losses | 32,061 | 25,101
AFS, Total Estimated Fair Value | 163,852 | 171,749
AFS, Total Unrealized Losses | 32,669 | 31,236
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 14,846 | 32,517
AFS, Less than 12 months, Unrealized Losses | 155 | 3,629
AFS, 12 months or more, Estimated Fair Value | 81,318 | 47,580
AFS, 12 months or more, Unrealized Losses | 9,913 | 7,622
AFS, Total Estimated Fair Value | 96,164 | 80,097
AFS, Total Unrealized Losses | 10,068 | 11,251
Treasury securities |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 9,656 | 155,283
AFS, Less than 12 months, Unrealized Losses | 247 | 3,652
AFS, 12 months or more, Estimated Fair Value | 97,240 | 0
AFS, 12 months or more, Unrealized Losses | 2,523 | 0
AFS, Total Estimated Fair Value | 106,896 | 155,283
AFS, Total Unrealized Losses | 2,770 | 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 | 42,169 | 47,213
AFS, 12 months or more, Unrealized Losses | 1,560 | 2,190
AFS, Total Estimated Fair Value | 42,169 | 47,213
AFS, Total Unrealized Losses | $ 1,560 | $ 2,190

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