Fair Value - Summary of OREO Measured on Nonrecurring Basis Valuation Techniques (Detail) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items]
Other real estate owned, fair value		$ 134
Other real estate owned, valuation technique	Discounted appraised value	Discounted appraised value
Other real estate owned, significant unobservable inputs	Discounted for selling costs	Discounted for selling costs
Minimum [Member] | Measurement Input, Discount Rate [Member]
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items]
Other real estate owned, range		15.00%
Maximum [Member] | Measurement Input, Discount Rate [Member]
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items]
Other real estate owned, range		35.00%