Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ (15)	$ (62)
Gross Unrealized Losses, Less Than 12 Months	(212)	(74)
Fair Value, Less Than 12 Months	23,846	22,702
Gross Unrealized Losses, 12 Months Or More	(360)	(417)
Fair Value, 12 Months Or More	6,198	25,704
Gross Unrealized Losses, Total	(572)	(491)
Fair Value, Total	30,044	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	(64)	(17)
Fair Value, 12 Months Or More	831	917
Gross Unrealized Losses, Total	(64)	(17)
Fair Value, Total	831	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	(282)	(262)
Fair Value, 12 Months Or More	3,695	3,712
Gross Unrealized Losses, Total	(282)	(262)
Fair Value, Total	3,695	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	(15)
Held-to-maturity, Fair Value, Less Than 12 Months	2,076
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	(15)	(56)
Held-to-maturity, Fair Value, Total	2,076	3,009
Gross Unrealized Losses, Less Than 12 Months	(197)	(74)
Fair Value, Less Than 12 Months	21,770	22,702
Gross Unrealized Losses, 12 Months Or More	(14)	(71)
Fair Value, 12 Months Or More	1,672	8,924
Gross Unrealized Losses, Total	(211)	(145)
Fair Value, Total	$ 23,442	$ 31,626

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