Other Real Estate Owned, Net - Number and Carrying Values of Properties Included in Other Real Estate Owned (OREO) (Detail) $ in Thousands	Sep. 30, 2020 USD ($) Property	Dec. 31, 2019 USD ($) Property
Real Estate Properties [Line Items]
No. of Properties | Property	13	18
Carrying Value | $	$ 1,113	$ 1,916	[1]
Residential
Real Estate Properties [Line Items]
No. of Properties | Property	4	4
Carrying Value | $	$ 228	$ 302
Land
Real Estate Properties [Line Items]
No. of Properties | Property	8	13
Carrying Value | $	$ 625	$ 1,354
Commercial properties
Real Estate Properties [Line Items]
No. of Properties | Property	1	1
Carrying Value | $	$ 260	$ 260

[1] Derived from audited December 31, 2019 Consolidated Financial Statements.