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Investment Securities - Amortized Cost of Debt Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | $ 139,058 | $ 160,983
AAA/AA/A |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 139,058 | 160,983
BBB/BB/B |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 0 | 0
Obligations of U.S. government agencies | AAA/AA/A |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 136,398 | 154,830
Obligations of U.S. government agencies | BBB/BB/B |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 0 | 0
Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 2,660 | 6,153
Obligations of states and political subdivisions | AAA/AA/A |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 2,660 | 6,153
Obligations of states and political subdivisions | BBB/BB/B |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | $ 0 | $ 0

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