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Fair Value - Summary of OREO Measured at Fair Value on a Nonrecurring Basis (Detail) - Fair Value, Nonrecurring [Member] $ in Thousands	Dec. 31, 2018 USD ($)
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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Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items]

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