Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ (12)	$ (62)
Gross Unrealized Losses, Less Than 12 Months	(205)	(74)
Fair Value, Less Than 12 Months	26,010	22,702
Gross Unrealized Losses, 12 Months Or More	(343)	(417)
Fair Value, 12 Months Or More	5,410	25,704
Gross Unrealized Losses, Total	(548)	(491)
Fair Value, Total	31,420	48,406
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More		(6)
Held-to-maturity, Fair Value, 12 Months Or More		4,993
Held-to-maturity, Gross Unrealized Losses, Total		(6)
Held-to-maturity, Fair Value, Total		4,993
Gross Unrealized Losses, 12 Months Or More		(4)
Fair Value, 12 Months Or More		3,496
Gross Unrealized Losses, Total		(4)
Fair Value, Total		3,496
Asset-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, 12 Months Or More	(62)	(17)
Fair Value, 12 Months Or More	806	917
Gross Unrealized Losses, Total	(62)	(17)
Fair Value, Total	806	917
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, 12 Months Or More		(1)
Fair Value, 12 Months Or More		653
Gross Unrealized Losses, Total		(1)
Fair Value, Total		653
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, 12 Months Or More	(274)	(262)
Fair Value, 12 Months Or More	3,704	3,712
Gross Unrealized Losses, Total	(274)	(262)
Fair Value, Total	3,704	3,712
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months	(12)
Held-to-maturity, Fair Value, Less Than 12 Months	1,913
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More		(56)
Held-to-maturity, Fair Value, 12 Months Or More		3,009
Held-to-maturity, Gross Unrealized Losses, Total	(12)	(56)
Held-to-maturity, Fair Value, Total	1,913	3,009
Gross Unrealized Losses, Less Than 12 Months	(193)	(74)
Fair Value, Less Than 12 Months	24,097	22,702
Gross Unrealized Losses, 12 Months Or More	(7)	(71)
Fair Value, 12 Months Or More	900	8,924
Gross Unrealized Losses, Total	(200)	(145)
Fair Value, Total	$ 24,997	$ 31,626

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