Investment in Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Amortized Cost	$ 802,926	$ 664,271
Gross Unrealized Gains	2,549	13,138
Gross Unrealized Losses	30,865	3,956
Fair Value	774,610	673,453
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
Debt Securities, Available-for-sale, Unrealized Loss Position	457,945	328,196
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	30,865	3,956
State and political subdivisions
Marketable Securities [Line Items]
Amortized Cost	347,450	359,187
Gross Unrealized Gains	2,417	12,931
Gross Unrealized Losses	10,543	990
Fair Value	339,324	371,128
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
Debt Securities, Available-for-sale, Unrealized Loss Position	127,246	60,083
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	10,543	990
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises
Marketable Securities [Line Items]
Amortized Cost	205,522	170,711
Gross Unrealized Gains	0	135
Gross Unrealized Losses	13,763	2,200
Fair Value	191,759	168,646
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
Debt Securities, Available-for-sale, Unrealized Loss Position	191,760	163,652
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	13,763	2,200
Corporate bonds
Marketable Securities [Line Items]
Amortized Cost	96,516	84,538
Gross Unrealized Gains	0	72
Gross Unrealized Losses	5,321	272
Fair Value	91,195	84,338
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
Debt Securities, Available-for-sale, Unrealized Loss Position	86,195	55,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	5,321	272
U.S. treasury bonds
Marketable Securities [Line Items]
Amortized Cost	99,455
Gross Unrealized Gains	132
Gross Unrealized Losses	0
Fair Value	99,587
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises
Marketable Securities [Line Items]
Amortized Cost	53,983	49,835
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,238	494
Fair Value	52,745	49,341
AFS, Less than 12 months, Estimated Fair Value	52,744	49,341
AFS, Less than 12 months, Unrealized Losses	1,238	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	52,744	49,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,238	$ 494

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).

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