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Allowance for Loans Losses - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, related allowance $ 231 $ 241
Impaired financing receivable, recorded investment 1,077 1,408
Impaired financing receivable, unpaid principal balance 1,077 1,408
Impaired financing receivable, average recorded investment 1,243 1,547
Impaired financing receivable, interest income recognized 5 14
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with an allowance recorded, recorded investment 270 280
Impaired financing receivable, with an allowance recorded, unpaid principal balance 270 280
Impaired financing receivable, related allowance 135 143
Impaired financing receivable, with an allowance recorded, average recorded investment 275 286
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 395 395
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance 395 395
Impaired financing receivable, with no specific allowance recorded, average recorded investment 395 527
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 412 733
Impaired financing receivable, with an allowance recorded, unpaid principal balance 412 733
Impaired financing receivable, related allowance 96 98
Impaired financing receivable, with an allowance recorded, average recorded investment 573 734
Impaired financing receivable, with an allowance recorded, interest income recognized $ 4 $ 5