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Loans - Summary of Troubled Debt Restructurings (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Contract
Sep. 30, 2018
USD ($)
Contract
Sep. 30, 2019
USD ($)
Contract
Sep. 30, 2018
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Number of loans restructured | Contract 0 2 1 3
Pre-Modification Recorded Investment   $ 27 $ 17 $ 227
Post-Modification Recorded Investment   $ 27 $ 17 $ 227
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of loans restructured | Contract   2 1  
Pre-Modification Recorded Investment   $ 27 $ 17  
Post-Modification Recorded Investment   $ 27 $ 17  
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of loans restructured | Contract       1
Pre-Modification Recorded Investment       $ 200
Post-Modification Recorded Investment       $ 200
Residential Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of loans restructured | Contract       2
Pre-Modification Recorded Investment       $ 27
Post-Modification Recorded Investment       $ 27