Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ (37,641)	$ (819)
Gross Unrealized Losses, Less Than 12 Months	(26,612)	(1,717)
Fair Value, Less Than 12 Months	203,212	177,345
Gross Unrealized Losses, 12 Months Or More	(27,054)	(579)
Fair Value, 12 Months Or More	142,103	25,103
Gross Unrealized Losses, Total	(53,666)	(2,296)
Fair Value, Total	345,315	202,448
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(1,033)	(10)
Available-for-sale, Fair Value, Less Than 12 Months	22,181	4,972
Available-for-sale, Gross Unrealized Losses, Total	(1,033)	(10)
Available-for-sale, Fair Value, Total	22,181	4,972
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months		(39)
Held-to-maturity, Fair Value, Less Than 12 Months		9,837
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(1,209)
Held-to-maturity, Fair Value, 12 Months Or More	11,531
Held-to-maturity, Gross Unrealized Losses, Total	(1,209)	(39)
Held-to-maturity, Fair Value, Total	11,531	9,837
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	(16)	(7)
Available-for-sale, Fair Value, 12 Months or More	656	753
Available-for-sale, Gross Unrealized Losses, Total	(16)	(7)
Available-for-sale, Fair Value, Total	656	753
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(2,562)	(44)
Available-for-sale, Fair Value, Less Than 12 Months	25,202	5,710
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(118)	(45)
Available-for-sale, Fair Value, 12 Months or More	882	955
Available-for-sale, Gross Unrealized Losses, Total	(2,680)	(89)
Available-for-sale, Fair Value, Total	26,084	6,665
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months		(69)
Available-for-sale, Fair Value, Less Than 12 Months		2,930
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(1,408)	(258)
Available-for-sale, Fair Value, 12 Months or More	12,591	10,742
Available-for-sale, Gross Unrealized Losses, Total	(1,408)	(327)
Available-for-sale, Fair Value, Total	12,591	13,672
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(926)	(201)
Available-for-sale, Fair Value, Less Than 12 Months	18,816	9,646
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(387)
Available-for-sale, Fair Value, 12 Months or More	2,371
Available-for-sale, Gross Unrealized Losses, Total	(1,313)	(201)
Available-for-sale, Fair Value, Total	21,187	9,646
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months	(181)	(14)
Held-to-maturity, Fair Value, Less Than 12 Months	1,273	1,749
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(210)
Held-to-maturity, Fair Value, 12 Months Or More	924
Held-to-maturity, Gross Unrealized Losses, Total	(391)	(14)
Held-to-maturity, Fair Value, Total	2,197	1,749
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	(1,584)	(574)
Available-for-sale, Fair Value, Less Than 12 Months	14,973	43,595
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(7,991)	(269)
Available-for-sale, Fair Value, 12 Months or More	42,288	12,653
Available-for-sale, Gross Unrealized Losses, Total	(9,575)	(843)
Available-for-sale, Fair Value, Total	57,261	56,248
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months	(20,326)	(766)
Held-to-maturity, Fair Value, Less Than 12 Months	120,767	98,906
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(15,715)
Held-to-maturity, Fair Value, 12 Months Or More	70,860
Held-to-maturity, Gross Unrealized Losses, Total	(36,041)	(766)
Held-to-maturity, Fair Value, Total	$ 191,627	$ 98,906

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