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Allowance for Loans Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, related allowance $ 179 $ 241
Impaired financing receivable, recorded investment 1,364 1,408
Impaired financing receivable, unpaid principal balance 1,364 1,408
Impaired financing receivable, average recorded investment 1,222 1,547
Impaired financing receivable, interest income recognized 3 14
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 259 280
Impaired financing receivable, with an allowance recorded, unpaid principal balance 259 280
Impaired financing receivable, related allowance 81 143
Impaired financing receivable, with an allowance recorded, average recorded investment 265 286
Impaired financing receivable, with an allowance recorded, interest income recognized 1 2
Real Estate [Member] | Mortgage, Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no specific allowance recorded, recorded investment 767 395
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 767 395
Impaired financing receivable, with no specific allowance recorded, average recorded investment 581 527
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method   7
Real Estate [Member] | Mortgage, Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 338 733
Impaired financing receivable, with an allowance recorded, unpaid principal balance 338 733
Impaired financing receivable, related allowance 98 98
Impaired financing receivable, with an allowance recorded, average recorded investment 376 734
Impaired financing receivable, with an allowance recorded, interest income recognized $ 2 $ 5