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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 254,371 | $ 456,451
AFS, Less than 12 months, Unrealized Losses | 3,599 | 22,374
AFS, 12 months or more, Estimated Fair Value | 398,519 | 260,284
AFS, 12 months or more, Unrealized Losses | 57,909 | 48,259
AFS, Total Estimated Fair Value | 652,890 | 716,735
AFS, Total Unrealized Losses | 61,508 | 70,633
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 80,551 | 214,919
AFS, Less than 12 months, Unrealized Losses | 387 | 8,958
AFS, 12 months or more, Estimated Fair Value | 114,603 | 47,474
AFS, 12 months or more, Unrealized Losses | 17,181 | 13,346
AFS, Total Estimated Fair Value | 195,154 | 262,393
AFS, Total Unrealized Losses | 17,568 | 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 | 12,346 | 53,732
AFS, Less than 12 months, Unrealized Losses | 443 | 6,135
AFS, 12 months or more, Estimated Fair Value | 159,194 | 118,017
AFS, 12 months or more, Unrealized Losses | 29,111 | 25,101
AFS, Total Estimated Fair Value | 171,540 | 171,749
AFS, Total Unrealized Losses | 29,554 | 31,236
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 5,000 | 32,517
AFS, Less than 12 months, Unrealized Losses | 0 | 3,629
AFS, 12 months or more, Estimated Fair Value | 81,647 | 47,580
AFS, 12 months or more, Unrealized Losses | 9,643 | 7,622
AFS, Total Estimated Fair Value | 86,647 | 80,097
AFS, Total Unrealized Losses | 9,643 | 11,251
Treasury securities |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 156,474 | 155,283
AFS, Less than 12 months, Unrealized Losses | 2,769 | 3,652
AFS, 12 months or more, Estimated Fair Value | 0 | 0
AFS, 12 months or more, Unrealized Losses | 0 | 0
AFS, Total Estimated Fair Value | 156,474 | 155,283
AFS, Total Unrealized Losses | 2,769 | 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 | 43,075 | 47,213
AFS, 12 months or more, Unrealized Losses | 1,974 | 2,190
AFS, Total Estimated Fair Value | 43,075 | 47,213
AFS, Total Unrealized Losses | $ 1,974 | $ 2,190

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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