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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 571,177 | $ 328,196
AFS, Less than 12 months, Unrealized Losses | 50,380 | 3,956
AFS, 12 months or more, Estimated Fair Value | 15,095 | 0
AFS, 12 months or more, Unrealized Losses | 2,602 | 0
AFS, Total Estimated Fair Value | 586,272 | 328,196
AFS, Total Unrealized Losses | 52,982 | 3,956
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 177,339 | 60,083
AFS, Less than 12 months, Unrealized Losses | 18,358 | 990
AFS, 12 months or more, Estimated Fair Value | 0 | 0
AFS, 12 months or more, Unrealized Losses | 0 | 0
AFS, Total Estimated Fair Value | 177,339 | 60,083
AFS, Total Unrealized Losses | 18,358 | 990
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 | 163,657 | 163,652
AFS, Less than 12 months, Unrealized Losses | 19,123 | 2,200
AFS, 12 months or more, Estimated Fair Value | 15,095 | 0
AFS, 12 months or more, Unrealized Losses | 2,602 | 0
AFS, Total Estimated Fair Value | 178,752 | 163,652
AFS, Total Unrealized Losses | 21,725 | 2,200
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 81,774 | 55,120
AFS, Less than 12 months, Unrealized Losses | 9,686 | 272
AFS, 12 months or more, Estimated Fair Value | 0 | 0
AFS, 12 months or more, Unrealized Losses | 0 | 0
AFS, Total Estimated Fair Value | 81,774 | 55,120
AFS, Total Unrealized Losses | 9,686 | $ 272
U.S. treasury bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 98,562 |
AFS, Less than 12 months, Unrealized Losses | 954 |
AFS, 12 months or more, Estimated Fair Value | 0 |
AFS, 12 months or more, Unrealized Losses | 0 |
AFS, Total Estimated Fair Value | 98,562 |
AFS, Total Unrealized Losses | $ 954 |

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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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