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Investment Securities - Summary of Debt Securities in Unrealized Loss position for Which Allowance for Credit Losses Not Recorded (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 6,036 | $ 53,222
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (159) | (4,911)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 67,608 | 22,817
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (7,551) | (3,210)
Available-for-sale Securities, Fair Value, Total | 73,644 | 76,039
Available-for-sale Securities, Unrealized Losses, Total | (7,710) | (8,121)
Held-to-maturity Securities, Less than 12 Months, Fair Value | 12,942 | 30,080
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | (817) | (1,742)
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 23,115 | 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | (1,931) | 0
Held-to-maturity Securities, Fair Value, Total | 36,057 | 30,080
Held-to-maturity Securities, Unrealized Losses, Total | (2,748) | (1,742)
U.S. government agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 1,981 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (19) |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 0 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 0 |
Available-for-sale Securities, Fair Value, Total | 1,981 |
Available-for-sale Securities, Unrealized Losses, Total | (19) |
Small Business Administration Loan Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 0 | 334
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 0 | (1)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 711 | 509
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (15) | (14)
Available-for-sale Securities, Fair Value, Total | 711 | 843
Available-for-sale Securities, Unrealized Losses, Total | (15) | (15)
Obligations of state and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 4,008 | 34,836
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (139) | (3,372)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 27,946 | 2,559
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (3,589) | (662)
Available-for-sale Securities, Fair Value, Total | 31,954 | 37,395
Available-for-sale Securities, Unrealized Losses, Total | (3,728) | (4,034)
Mortgage-backed securities in government-sponsored entities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 47 | 18,052
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (1) | (1,538)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 38,951 | 19,749
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (3,947) | (2,534)
Available-for-sale Securities, Fair Value, Total | 38,998 | 37,801
Available-for-sale Securities, Unrealized Losses, Total | (3,948) | (4,072)
Corporate Debentures [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 7,234 | 13,999
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | (765) | (994)
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 5,983 | 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | (1,017) | 0
Held-to-maturity Securities, Fair Value, Total | 13,217 | 13,999
Held-to-maturity Securities, Unrealized Losses, Total | (1,782) | (994)
Structured Mortgage-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 5,708 | 16,081
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | (52) | (748)
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 17,132 | 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | (914) | 0
Held-to-maturity Securities, Fair Value, Total | 22,840 | 16,081
Held-to-maturity Securities, Unrealized Losses, Total | $ (966) | $ (748)

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