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Investment in Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 756,338 | $ 587,708
Gross Unrealized Gains | 3,317 | 18
Gross Unrealized Losses | (42,286) | (59,705)
Fair Value | 717,369 | 528,021
AFS, Less than 12 months, Estimated Fair Value | 120,480 | 97,255
AFS, Less than 12 months, Unrealized Losses | 1,243 | 2,193
AFS, 12 months or more, Estimated Fair Value | 351,106 | 401,004
AFS, 12 months or more, Unrealized Losses | 41,043 | 57,512
Debt Securities, Available-for-sale, Unrealized Loss Position | 471,586 | 498,259
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 42,286 | 59,705
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 257,145 | 188,933
Gross Unrealized Gains | 1,802 | 4
Gross Unrealized Losses | (11,838) | (16,973)
Fair Value | 247,109 | 171,964
AFS, Less than 12 months, Estimated Fair Value | 2,814 | 4,082
AFS, Less than 12 months, Unrealized Losses | 16 | 8
AFS, 12 months or more, Estimated Fair Value | 148,209 | 163,893
AFS, 12 months or more, Unrealized Losses | 11,822 | 16,964
Debt Securities, Available-for-sale, Unrealized Loss Position | 151,023 | 167,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 11,838 | 16,972
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 439,159 | 267,359
Gross Unrealized Gains | 1,515 | 11
Gross Unrealized Losses | (27,864) | (34,095)
Fair Value | 412,810 | 233,275
AFS, Less than 12 months, Estimated Fair Value | 117,666 | 85,272
AFS, Less than 12 months, Unrealized Losses | 1,227 | 2,086
AFS, 12 months or more, Estimated Fair Value | 145,446 | 139,676
AFS, 12 months or more, Unrealized Losses | 26,637 | 32,009
Debt Securities, Available-for-sale, Unrealized Loss Position | 263,112 | 224,948
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 27,864 | 34,095
Corporate bonds |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 30,960 | 95,841
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (2,238) | (8,058)
Fair Value | 28,722 | 87,786
AFS, Less than 12 months, Estimated Fair Value | 0 | 7,901
AFS, Less than 12 months, Unrealized Losses | 0 | 99
AFS, 12 months or more, Estimated Fair Value | 28,723 | 66,860
AFS, 12 months or more, Unrealized Losses | 2,238 | 7,960
Debt Securities, Available-for-sale, Unrealized Loss Position | 28,723 | 74,761
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,238 | 8,059
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 29,074 | 35,575
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (346) | (579)
Fair Value | 28,728 | 34,996
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 | 28,728 | 30,575
AFS, 12 months or more, Unrealized Losses | 346 | 579
Debt Securities, Available-for-sale, Unrealized Loss Position | 28,728 | 30,575
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 346 | $ 579

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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