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Investment in Securities - Schedule of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Marketable Securities [Line Items]    
Amortized Cost $ 704,378 $ 825,047
Gross Unrealized Gains 1 54
Gross Unrealized Losses 66,866 70,633
Fair Value 637,513 754,468
AFS, Less than 12 months, Estimated Fair Value 140,412 456,451
AFS, Less than 12 months, Unrealized Losses 2,181 22,374
AFS, 12 months or more, Estimated Fair Value 491,101 260,284
AFS, 12 months or more, Unrealized Losses 64,685 48,259
Debt Securities, Available-for-sale, Unrealized Loss Position 631,513 716,735
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 66,866 70,633
State and political subdivisions    
Marketable Securities [Line Items]    
Amortized Cost 243,231 317,376
Gross Unrealized Gains 1 54
Gross Unrealized Losses 19,799 22,304
Fair Value 223,433 295,126
AFS, Less than 12 months, Estimated Fair Value 104,329 214,919
AFS, Less than 12 months, Unrealized Losses 1,171 8,958
AFS, 12 months or more, Estimated Fair Value 118,103 47,474
AFS, 12 months or more, Unrealized Losses 18,628 13,346
Debt Securities, Available-for-sale, Unrealized Loss Position 222,432 262,393
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 19,799 22,304
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Marketable Securities [Line Items]    
Amortized Cost 196,521 205,175
Gross Unrealized Gains 0 0
Gross Unrealized Losses 32,669 31,236
Fair Value 163,852 173,939
AFS, Less than 12 months, Estimated Fair Value 11,581 53,732
AFS, Less than 12 months, Unrealized Losses 608 6,135
AFS, 12 months or more, Estimated Fair Value 152,271 118,017
AFS, 12 months or more, Unrealized Losses 32,061 25,101
Debt Securities, Available-for-sale, Unrealized Loss Position 163,852 171,749
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 32,669 31,236
Corporate bonds    
Marketable Securities [Line Items]    
Amortized Cost 111,231 96,348
Gross Unrealized Gains 0 0
Gross Unrealized Losses 10,068 11,251
Fair Value 101,163 85,097
AFS, Less than 12 months, Estimated Fair Value 14,846 32,517
AFS, Less than 12 months, Unrealized Losses 155 3,629
AFS, 12 months or more, Estimated Fair Value 81,318 47,580
AFS, 12 months or more, Unrealized Losses 9,913 7,622
Debt Securities, Available-for-sale, Unrealized Loss Position 96,164 80,097
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 10,068 11,251
Treasury securities    
Marketable Securities [Line Items]    
Amortized Cost 109,666 158,935
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,770 3,652
Fair Value 106,896 155,283
AFS, Less than 12 months, Estimated Fair Value 9,656 155,283
AFS, Less than 12 months, Unrealized Losses 247 3,652
AFS, 12 months or more, Estimated Fair Value 97,240 0
AFS, 12 months or more, Unrealized Losses 2,523 0
Debt Securities, Available-for-sale, Unrealized Loss Position 106,896 155,283
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 2,770 3,652
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Marketable Securities [Line Items]    
Amortized Cost 43,729 47,213
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,560 2,190
Fair Value 42,169 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 42,169 47,213
AFS, 12 months or more, Unrealized Losses 1,560 2,190
Debt Securities, Available-for-sale, Unrealized Loss Position 42,169 47,213
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1,560 $ 2,190