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Investment in Securities - Schedule of Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Marketable Securities [Line Items]    
Amortized Cost $ 696,379 $ 825,047
Gross Unrealized Gains 2 54
Gross Unrealized Losses 80,526 70,633
Fair Value 615,855 754,468
AFS, Less than 12 months, Estimated Fair Value 78,195 456,451
AFS, Less than 12 months, Unrealized Losses 1,244 22,374
AFS, 12 months or more, Estimated Fair Value 529,657 260,284
AFS, 12 months or more, Unrealized Losses 79,282 48,259
Debt Securities, Available-for-sale, Unrealized Loss Position 607,852 716,735
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 80,526 70,633
State and political subdivisions    
Marketable Securities [Line Items]    
Amortized Cost 241,194 317,376
Gross Unrealized Gains 2 54
Gross Unrealized Losses 25,735 22,304
Fair Value 215,461 295,126
AFS, Less than 12 months, Estimated Fair Value 63,256 214,919
AFS, Less than 12 months, Unrealized Losses 1,183 8,958
AFS, 12 months or more, Estimated Fair Value 149,202 47,474
AFS, 12 months or more, Unrealized Losses 24,552 13,346
Debt Securities, Available-for-sale, Unrealized Loss Position 212,458 262,393
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 25,735 22,304
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Marketable Securities [Line Items]    
Amortized Cost 192,241 205,175
Gross Unrealized Gains 0 0
Gross Unrealized Losses 39,806 31,236
Fair Value 152,435 173,939
AFS, Less than 12 months, Estimated Fair Value 0 53,732
AFS, Less than 12 months, Unrealized Losses 0 6,135
AFS, 12 months or more, Estimated Fair Value 152,435 118,017
AFS, 12 months or more, Unrealized Losses 39,806 25,101
Debt Securities, Available-for-sale, Unrealized Loss Position 152,435 171,749
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 39,806 31,236
Corporate bonds    
Marketable Securities [Line Items]    
Amortized Cost 111,172 96,348
Gross Unrealized Gains 0 0
Gross Unrealized Losses 11,723 11,251
Fair Value 99,449 85,097
AFS, Less than 12 months, Estimated Fair Value 14,939 32,517
AFS, Less than 12 months, Unrealized Losses 61 3,629
AFS, 12 months or more, Estimated Fair Value 79,510 47,580
AFS, 12 months or more, Unrealized Losses 11,662 7,622
Debt Securities, Available-for-sale, Unrealized Loss Position 94,449 80,097
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 11,723 11,251
Treasury securities    
Marketable Securities [Line Items]    
Amortized Cost 109,752 158,935
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,030 3,652
Fair Value 107,722 155,283
AFS, Less than 12 months, Estimated Fair Value 0 155,283
AFS, Less than 12 months, Unrealized Losses 0 3,652
AFS, 12 months or more, Estimated Fair Value 107,722 0
AFS, 12 months or more, Unrealized Losses 2,030 0
Debt Securities, Available-for-sale, Unrealized Loss Position 107,722 155,283
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 2,030 3,652
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Marketable Securities [Line Items]    
Amortized Cost 42,020 47,213
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,232 2,190
Fair Value 40,788 45,023
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 40,788 47,213
AFS, 12 months or more, Unrealized Losses 1,232 2,190
Debt Securities, Available-for-sale, Unrealized Loss Position 40,788 47,213
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1,232 $ 2,190