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Investment in Securities - Schedule of Investment Securities (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Marketable Securities [Line Items]    
Amortized Cost $ 764,474,000 $ 825,047,000
Gross Unrealized Gains 71,000 54,000
Gross Unrealized Losses 61,508,000 70,633,000
Fair Value 703,037,000 754,468,000
AFS, Less than 12 months, Estimated Fair Value 254,371,000 456,451,000
AFS, Less than 12 months, Unrealized Losses 3,599,000 22,374,000
AFS, 12 months or more, Estimated Fair Value 398,519,000 260,284,000
AFS, 12 months or more, Unrealized Losses 57,909,000 48,259,000
Debt Securities, Available-for-sale, Unrealized Loss Position 652,890,000 716,735,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 61,508,000 70,633,000
State and political subdivisions    
Marketable Securities [Line Items]    
Amortized Cost 247,798,000 317,376,000
Gross Unrealized Gains 52,000 54,000
Gross Unrealized Losses 17,568,000 22,304,000
Fair Value 230,282,000 295,126,000
AFS, Less than 12 months, Estimated Fair Value 80,551,000 214,919,000
AFS, Less than 12 months, Unrealized Losses 387,000 8,958,000
AFS, 12 months or more, Estimated Fair Value 114,603,000 47,474,000
AFS, 12 months or more, Unrealized Losses 17,181,000 13,346,000
Debt Securities, Available-for-sale, Unrealized Loss Position 195,154,000 262,393,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 17,568,000 22,304,000
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Marketable Securities [Line Items]    
Amortized Cost 201,094,000 205,175,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 29,554,000 31,236,000
Fair Value 171,540,000 173,939,000
AFS, Less than 12 months, Estimated Fair Value 12,346,000 53,732,000
AFS, Less than 12 months, Unrealized Losses 443,000 6,135,000
AFS, 12 months or more, Estimated Fair Value 159,194,000 118,017,000
AFS, 12 months or more, Unrealized Losses 29,111,000 25,101,000
Debt Securities, Available-for-sale, Unrealized Loss Position 171,540,000 171,749,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 29,554,000 31,236,000
Corporate bonds    
Marketable Securities [Line Items]    
Amortized Cost 111,290,000 96,348,000
Gross Unrealized Gains 19,000 0
Gross Unrealized Losses 9,643,000 11,251,000
Fair Value 101,666,000 85,097,000
AFS, Less than 12 months, Estimated Fair Value 5,000,000 32,517,000
AFS, Less than 12 months, Unrealized Losses 0 3,629,000
AFS, 12 months or more, Estimated Fair Value 81,647,000 47,580,000
AFS, 12 months or more, Unrealized Losses 9,643,000 7,622,000
Debt Securities, Available-for-sale, Unrealized Loss Position 86,647,000 80,097,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 9,643,000 11,251,000
Treasury securities    
Marketable Securities [Line Items]    
Amortized Cost 159,244,000 158,935,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,769,000 3,652,000
Fair Value 156,475,000 155,283,000
AFS, Less than 12 months, Estimated Fair Value 156,474,000 155,283,000
AFS, Less than 12 months, Unrealized Losses 2,769,000 3,652,000
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 156,474,000 155,283,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 2,769,000 3,652,000
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Marketable Securities [Line Items]    
Amortized Cost 45,048,000 47,213,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,974,000 2,190,000
Fair Value 43,074,000 45,023,000
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 43,075,000 47,213,000
AFS, 12 months or more, Unrealized Losses 1,974,000 2,190,000
Debt Securities, Available-for-sale, Unrealized Loss Position 43,075,000 47,213,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1,974,000 $ 2,190,000