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Investment in Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 841,781 | $ 664,271
Gross Unrealized Gains | 18 | 13,138
Gross Unrealized Losses | 78,010 | 3,956
Fair Value | 763,789 | 673,453
AFS, Less than 12 months, Estimated Fair Value | 641,920 | 328,196
AFS, Less than 12 months, Unrealized Losses | 53,813 | 3,956
AFS, 12 months or more, Estimated Fair Value | 95,191 | 0
AFS, 12 months or more, Unrealized Losses | 24,197 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 737,111 | 328,196
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 78,010 | 3,956
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 326,506 | 359,187
Gross Unrealized Gains | 18 | 12,931
Gross Unrealized Losses | 28,078 | 990
Fair Value | 298,446 | 371,128
AFS, Less than 12 months, Estimated Fair Value | 246,743 | 60,083
AFS, Less than 12 months, Unrealized Losses | 19,158 | 990
AFS, 12 months or more, Estimated Fair Value | 30,025 | 0
AFS, 12 months or more, Unrealized Losses | 8,920 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 276,768 | 60,083
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 28,078 | 990
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 210,111 | 170,711
Gross Unrealized Gains | 0 | 135
Gross Unrealized Losses | 31,978 | 2,200
Fair Value | 178,133 | 168,646
AFS, Less than 12 months, Estimated Fair Value | 119,478 | 163,652
AFS, Less than 12 months, Unrealized Losses | 18,240 | 2,200
AFS, 12 months or more, Estimated Fair Value | 58,655 | 0
AFS, 12 months or more, Unrealized Losses | 13,738 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 178,133 | 163,652
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 31,978 | 2,200
Corporate bonds |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 96,405 | 84,538
Gross Unrealized Gains | 0 | 72
Gross Unrealized Losses | 12,614 | 272
Fair Value | 83,791 | 84,338
AFS, Less than 12 months, Estimated Fair Value | 72,280 | 55,120
AFS, Less than 12 months, Unrealized Losses | 11,075 | 272
AFS, 12 months or more, Estimated Fair Value | 6,511 | 0
AFS, 12 months or more, Unrealized Losses | 1,539 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 78,791 | 55,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 12,614 | 272
U.S. treasury bonds |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 158,623 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 3,504 |
Fair Value | 155,119 |
AFS, Less than 12 months, Estimated Fair Value | 155,119 |
AFS, Less than 12 months, Unrealized Losses | 3,504 |
AFS, 12 months or more, Estimated Fair Value | 0 |
AFS, 12 months or more, Unrealized Losses | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 155,119 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,504 |
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 50,136 | 49,835
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,836 | 494
Fair Value | 48,300 | 49,341
AFS, Less than 12 months, Estimated Fair Value | 48,300 | 49,341
AFS, Less than 12 months, Unrealized Losses | 1,836 | 494
AFS, 12 months or more, Estimated Fair Value | 0 | 0
AFS, 12 months or more, Unrealized Losses | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 48,300 | 49,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,836 | $ 494

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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