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Investment Securities - Amortized Cost of Debt Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | $ 176,794 | $ 199,759
AAA/AA/A |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 176,794 | 199,759
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 | 170,337 | 192,068
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 | AAA/AA/A |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | 6,457 | 7,691
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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