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Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 441,572 | $ 328,196
AFS, Less than 12 months, Unrealized Losses | 29,039 | 3,956
AFS, 12 months or more, Estimated Fair Value | 16,373 | 0
AFS, 12 months or more, Unrealized Losses | 1,826 | 0
AFS, Total Estimated Fair Value | 457,945 | 328,196
AFS, Total Unrealized Losses | 30,865 | 3,956
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 127,246 | 60,083
AFS, Less than 12 months, Unrealized Losses | 10,543 | 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 | 127,246 | 60,083
AFS, Total Unrealized Losses | 10,543 | 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 | 175,387 | 163,652
AFS, Less than 12 months, Unrealized Losses | 11,937 | 2,200
AFS, 12 months or more, Estimated Fair Value | 16,373 | 0
AFS, 12 months or more, Unrealized Losses | 1,826 | 0
AFS, Total Estimated Fair Value | 191,760 | 163,652
AFS, Total Unrealized Losses | 13,763 | 2,200
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 86,195 | 55,120
AFS, Less than 12 months, Unrealized Losses | 5,321 | 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 | 86,195 | 55,120
AFS, Total Unrealized Losses | $ 5,321 | $ 272

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- Definition Amount of 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 more than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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