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Fair Value - Summary of other real estate owned measured at fair value on a nonrecurring basis (Detail) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items]
Other real estate owned, fair value		$ 134
Level 3 [Member]
Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items]
Other real estate owned, fair value		$ 134

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