Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ (30,339)	$ (35,448)
Gross Unrealized Losses, Less Than 12 Months	(855)	(12,931)
Fair Value, Less Than 12 Months	31,552	135,499
Gross Unrealized Losses, 12 Months Or More	(42,825)	(37,225)
Fair Value, 12 Months Or More	311,310	217,374
Gross Unrealized Losses, Total	(43,680)	(50,156)
Fair Value, Total	342,862	352,873
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(152)	(798)
Available-for-sale, Fair Value, Less Than 12 Months	7,815	17,405
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(594)	(171)
Available-for-sale, Fair Value, 12 Months or More	14,613	4,820
Available-for-sale, Gross Unrealized Losses, Total	(746)	(969)
Available-for-sale, Fair Value, Total	22,428	22,225
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(930)	(1,136)
Held-to-maturity, Fair Value, 12 Months Or More	11,836	11,617
Held-to-maturity, Gross Unrealized Losses, Total	(930)	(1,136)
Held-to-maturity, Fair Value, Total	11,836	11,617
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(1,149)	(1,369)
Available-for-sale, Fair Value, 12 Months or More	12,850	12,630
Available-for-sale, Gross Unrealized Losses, Total	(1,149)	(1,369)
Available-for-sale, Fair Value, Total	12,850	12,630
Asset-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(35)	(15)
Available-for-sale, Fair Value, 12 Months or More	571	618
Available-for-sale, Gross Unrealized Losses, Total	(35)	(15)
Available-for-sale, Fair Value, Total	571	618
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(459)	(1,165)
Available-for-sale, Fair Value, Less Than 12 Months	6,086	13,502
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(2,503)	(1,346)
Available-for-sale, Fair Value, 12 Months or More	19,667	12,727
Available-for-sale, Gross Unrealized Losses, Total	(2,962)	(2,511)
Available-for-sale, Fair Value, Total	25,753	26,229
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(37)	(189)
Available-for-sale, Fair Value, Less Than 12 Months	5,411	9,079
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(623)	(796)
Available-for-sale, Fair Value, 12 Months or More	12,415	9,848
Available-for-sale, Gross Unrealized Losses, Total	(660)	(985)
Available-for-sale, Fair Value, Total	17,826	18,927
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(181)	(261)
Held-to-maturity, Fair Value, 12 Months Or More	1,977	1,903
Held-to-maturity, Gross Unrealized Losses, Total	(181)	(261)
Held-to-maturity, Fair Value, Total	1,977	1,903
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(35)	(1,046)
Available-for-sale, Fair Value, Less Than 12 Months	4,870	16,188
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(7,754)	(7,813)
Available-for-sale, Fair Value, 12 Months or More	54,883	44,519
Available-for-sale, Gross Unrealized Losses, Total	(7,789)	(8,859)
Available-for-sale, Fair Value, Total	59,753	60,707
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months	(172)	(9,733)
Held-to-maturity, Fair Value, Less Than 12 Months	7,370	79,325
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(29,056)	(24,318)
Held-to-maturity, Fair Value, 12 Months Or More	182,498	118,692
Held-to-maturity, Gross Unrealized Losses, Total	(29,228)	(34,051)
Held-to-maturity, Fair Value, Total	$ 189,868	$ 198,017

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