Investment in Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
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