| Loans - Summary of Amortized Cost Basis of Collateral Dependent Loans By Class of Loans (Detail) $ in Thousands | Mar. 31, 2020  USD ($) | 
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| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | $ 35,297 | 
| Real Estate | |
| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | 33,505 | 
| Real Estate | Total commercial property loans | |
| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | 17,600 | 
| Real Estate | Construction | |
| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | 13,228 | 
| Real Estate | Residential property | |
| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | 2,677 | 
| Commercial and Industrial | |
| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | 596 | 
| Consumer | |
| Loans And Leases Receivable Disclosure [Line Items] | |
| Amortized Cost | $ 1,196 | 
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- Definition Loans receivable, collateral dependent loans, amortized cost basis. No definition available. 
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