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Fair Value - Summary of other real estate owned measured on nonrecurring basis valuation techniques (Detail) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 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%