Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
AFS, Less than 12 months, Estimated Fair Value	$ 67,930	$ 82,743
AFS, Less than 12 months, Unrealized Losses	657	675
AFS, 12 months or more, Estimated Fair Value	531,394	541,391
AFS, 12 months or more, Unrealized Losses	59,272	57,129
AFS, Total Estimated Fair Value	599,324	624,134
AFS, Total Unrealized Losses	59,929	57,804
State and political subdivisions
Marketable Securities [Line Items]
AFS, Less than 12 months, Estimated Fair Value	26,244	63,198
AFS, Less than 12 months, Unrealized Losses	164	220
AFS, 12 months or more, Estimated Fair Value	175,899	152,854
AFS, 12 months or more, Unrealized Losses	17,206	16,046
AFS, Total Estimated Fair Value	202,143	216,052
AFS, Total Unrealized Losses	17,370	16,266
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	29,086	0
AFS, Less than 12 months, Unrealized Losses	92	0
AFS, 12 months or more, Estimated Fair Value	147,282	157,799
AFS, 12 months or more, Unrealized Losses	32,126	30,508
AFS, Total Estimated Fair Value	176,368	157,799
AFS, Total Unrealized Losses	32,218	30,508
Corporate bonds
Marketable Securities [Line Items]
AFS, Less than 12 months, Estimated Fair Value	12,600	19,545
AFS, Less than 12 months, Unrealized Losses	401	455
AFS, 12 months or more, Estimated Fair Value	82,269	82,795
AFS, 12 months or more, Unrealized Losses	8,761	8,314
AFS, Total Estimated Fair Value	94,869	102,340
AFS, Total Unrealized Losses	9,162	8,769
Treasury securities
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	84,522	108,721
AFS, 12 months or more, Unrealized Losses	400	1,115
AFS, Total Estimated Fair Value	84,522	108,721
AFS, Total Unrealized Losses	400	1,115
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	41,422	39,222
AFS, 12 months or more, Unrealized Losses	779	1,146
AFS, Total Estimated Fair Value	41,422	39,222
AFS, Total Unrealized Losses	$ 779	$ 1,146

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.

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