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Investment Securities - Amortized Cost of Debt Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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AAA/AA/A |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Securities held to maturity | $ 101,672 | $ 111,866
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 | 98,940 | 109,155
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 | 2,732 | 2,711
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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