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Investment Securities - Schedule of the Fair Values of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | $ 456,451 | $ 328,196
AFS, Less than 12 Months, Unrealized Losses | 22,374 | 3,956
AFS, 12 months or more, Estimated Fair Value | 260,284 | 0
AFS, 12 months or more, Unrealized Losses | 48,259 | 0
AFS, Total Estimated Fair Value | 716,735 | 328,196
AFS, Total Unrealized Losses | 70,633 | 3,956
State and political subdivisions |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 214,919 | 60,083
AFS, Less than 12 Months, Unrealized Losses | 8,958 | 990
AFS, 12 months or more, Estimated Fair Value | 47,474 | 0
AFS, 12 months or more, Unrealized Losses | 13,346 | 0
AFS, Total Estimated Fair Value | 262,393 | 60,083
AFS, Total Unrealized Losses | 22,304 | 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 | 53,732 | 163,652
AFS, Less than 12 Months, Unrealized Losses | 6,135 | 2,200
AFS, 12 months or more, Estimated Fair Value | 118,017 | 0
AFS, 12 months or more, Unrealized Losses | 25,101 | 0
AFS, Total Estimated Fair Value | 171,749 | 163,652
AFS, Total Unrealized Losses | 31,236 | 2,200
Corporate bonds |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 32,517 | 55,120
AFS, Less than 12 Months, Unrealized Losses | 3,629 | 272
AFS, 12 months or more, Estimated Fair Value | 47,580 | 0
AFS, 12 months or more, Unrealized Losses | 7,622 | 0
AFS, Total Estimated Fair Value | 80,097 | 55,120
AFS, Total Unrealized Losses | 11,251 | 272
Treasury securities |  |
Marketable Securities [Line Items] |  |
AFS, Less than 12 months, Estimated Fair Value | 155,283 |
AFS, Less than 12 Months, Unrealized Losses | 3,652 |
AFS, 12 months or more, Estimated Fair Value | 0 |
AFS, 12 months or more, Unrealized Losses | 0 |
AFS, Total Estimated Fair Value | 155,283 |
AFS, Total Unrealized Losses | 3,652 |
Asset 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 | 0 | 49,341
AFS, Less than 12 Months, Unrealized Losses | 0 | 494
AFS, 12 months or more, Estimated Fair Value | 47,213 | 0
AFS, 12 months or more, Unrealized Losses | 2,190 | 0
AFS, Total Estimated Fair Value | 47,213 | 49,341
AFS, Total Unrealized Losses | $ 2,190 | $ 494

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