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
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)

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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