Investment Securities - Summary of Debt Securities in Unrealized Loss position for Which Allowance for Credit Losses Not Recorded (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 25,210	$ 53,222
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(988)	(4,911)
Available-for-sale Securities, 12 Months or Longer, Fair Value	51,222	22,817
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(5,689)	(3,210)
Available-for-sale Securities, Fair Value, Total	76,432	76,039
Available-for-sale Securities, Unrealized Losses, Total	(6,677)	(8,121)
Held-to-maturity Securities, Less than 12 Months, Fair Value	21,349	30,080
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(638)	(1,742)
Held-to-maturity Securities, 12 Months or Longer, Fair Value	0	0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses	0	0
Held-to-maturity Securities, Fair Value, Total	21,349	30,080
Held-to-maturity Securities, Unrealized Losses, Total	(638)	(1,742)
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	768	509
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(15)	(14)
Available-for-sale Securities, Fair Value, Total	768	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	21,742	34,836
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(923)	(3,372)
Available-for-sale Securities, 12 Months or Longer, Fair Value	15,228	2,559
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(2,352)	(662)
Available-for-sale Securities, Fair Value, Total	36,970	37,395
Available-for-sale Securities, Unrealized Losses, Total	(3,275)	(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	3,468	18,052
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(65)	(1,538)
Available-for-sale Securities, 12 Months or Longer, Fair Value	35,226	19,749
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(3,322)	(2,534)
Available-for-sale Securities, Fair Value, Total	38,694	37,801
Available-for-sale Securities, Unrealized Losses, Total	(3,387)	(4,072)
Corporate Debentures [Member]
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value		13,999
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses		(994)
Held-to-maturity Securities, 12 Months or Longer, Fair Value		0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses		0
Held-to-maturity Securities, Fair Value, Total		13,999
Held-to-maturity Securities, Unrealized Losses, Total		(994)
Structured Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	21,349	16,081
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(638)	(748)
Held-to-maturity Securities, 12 Months or Longer, Fair Value	0	0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses	0	0
Held-to-maturity Securities, Fair Value, Total	21,349	16,081
Held-to-maturity Securities, Unrealized Losses, Total	$ (638)	$ (748)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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