Investment Securities - Summary of Debt Securities in Unrealized Loss position for Which Allowance for Credit Losses Not Recorded (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Less than 12 Months, Fair Value	$ 14,012	$ 53,222
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(717)	(4,911)
Available-for-sale Securities, 12 Months or Longer, Fair Value	64,767	22,817
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(9,798)	(3,210)
Available-for-sale Securities, Fair Value, Total	78,779	76,039
Available-for-sale Securities, Unrealized Losses, Total	(10,515)	(8,121)
Held-to-maturity Securities, Less than 12 Months, Fair Value	8,227	30,080
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(66)	(1,742)
Held-to-maturity Securities, 12 Months or Longer, Fair Value	13,324	0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses	(1,161)	0
Held-to-maturity Securities, Fair Value, Total	21,551	30,080
Held-to-maturity Securities, Unrealized Losses, Total	(1,227)	(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	1,982
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(18)
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	1,982
Available-for-sale Securities, Unrealized Losses, Total	(18)
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	679	509
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(14)	(14)
Available-for-sale Securities, Fair Value, Total	679	843
Available-for-sale Securities, Unrealized Losses, Total	(14)	(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	7,383	34,836
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(479)	(3,372)
Available-for-sale Securities, 12 Months or Longer, Fair Value	32,296	2,559
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(5,456)	(662)
Available-for-sale Securities, Fair Value, Total	39,679	37,395
Available-for-sale Securities, Unrealized Losses, Total	(5,935)	(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	4,647	18,052
Available-for-sale Securities, Less than 12 Months, Unrealized Losses	(220)	(1,538)
Available-for-sale Securities, 12 Months or Longer, Fair Value	31,792	19,749
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses	(4,328)	(2,534)
Available-for-sale Securities, Fair Value, Total	36,439	37,801
Available-for-sale Securities, Unrealized Losses, Total	(4,548)	(4,072)
Corporate Debentures [Member]
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	0	13,999
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	0	(994)
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	0	13,999
Held-to-maturity Securities, Unrealized Losses, Total	0	(994)
Structured Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	8,227	16,081
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(66)	(748)
Held-to-maturity Securities, 12 Months or Longer, Fair Value	13,324	0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses	(1,161)	0
Held-to-maturity Securities, Fair Value, Total	21,551	16,081
Held-to-maturity Securities, Unrealized Losses, Total	$ (1,227)	$ (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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