Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ (21)	$ (12)
Gross Unrealized Losses, Less Than 12 Months	(1,948)	(114)
Fair Value, Less Than 12 Months	109,634	14,510
Gross Unrealized Losses, 12 Months Or More	(56)	(322)
Fair Value, 12 Months Or More	3,409	13,544
Gross Unrealized Losses, Total	(2,004)	(436)
Fair Value, Total	113,043	28,054
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(71)
Available-for-sale, Fair Value, Less Than 12 Months	2,856
Available-for-sale, Gross Unrealized Losses, Total	(71)
Available-for-sale, Fair Value, Total	2,856
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	(19)	(11)
Available-for-sale, Fair Value, 12 Months or More	786	837
Available-for-sale, Gross Unrealized Losses, Total	(19)	(11)
Available-for-sale, Fair Value, Total	786	837
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months		(32)
Available-for-sale, Fair Value, Less Than 12 Months		1,968
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(13)	(245)
Available-for-sale, Fair Value, 12 Months or More	987	3,733
Available-for-sale, Gross Unrealized Losses, Total	(13)	(277)
Available-for-sale, Fair Value, Total	987	5,701
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(171)
Available-for-sale, Fair Value, Less Than 12 Months	13,828
Available-for-sale, Gross Unrealized Losses, Total	(171)
Available-for-sale, Fair Value, Total	13,828
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months	(14)
Available-for-sale, Fair Value, Less Than 12 Months	795
Available-for-sale, Gross Unrealized Losses, Total	(14)
Available-for-sale, Fair Value, Total	795
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	(1,692)	(70)
Available-for-sale, Fair Value, Less Than 12 Months	92,155	10,808
Available-for-sale, Gross Unrealized Losses, 12 Months or More	(3)	(66)
Available-for-sale, Fair Value, 12 Months or More	328	8,974
Available-for-sale, Gross Unrealized Losses, Total	(1,695)	(136)
Available-for-sale, Fair Value, Total	92,483	19,782
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months		(12)
Held-to-maturity, Fair Value, Less Than 12 Months		1,734
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	(21)
Held-to-maturity, Fair Value, 12 Months Or More	1,308
Held-to-maturity, Gross Unrealized Losses, Total	(21)	(12)
Held-to-maturity, Fair Value, Total	$ 1,308	$ 1,734

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