Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
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

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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