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Federal Home Loan Bank and Short-term Borrowings (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) item shares | Dec. 31, 2017 USD ($)
Short-term Debt [Line Items] |  |
Federal home loan bank shares owned | shares | 24,756 |
Percentage of investment to be maintained on total assets | 0.09% |
Amount of dollar cap on total assets | $ 15.0 |
Additional percentage of investment to be maintained on total advances | 4.25% |
Percentage of credit available on total assets | 25.00% |
Amount of credit available on total assets | $ 102.7 |
Short term advances | 50.0 |
Average short-term borrowings | $ 31.7 | $ 1.5
Debt instrument, maturity date | Jan. 11, 2019 |
Debt instrument, interest rate, stated percentage | 3.00% |
Number of financial institution lending credit facility | item | 2 |
Number of borrowing days | 14 days |
Convertible advances maturing on July 23, 2019 | Federal Home Loan Bank of Atlanta [Member] |  |
Short-term Debt [Line Items] |  |
Convertible debt | $ 5.0 |
Debt instrument, maturity date | Jul. 23, 2019 |
Debt instrument, interest rate, stated percentage | 2.48% |
Convertible advances maturing on August 22, 2019 | Federal Home Loan Bank of Atlanta [Member] |  |
Short-term Debt [Line Items] |  |
Convertible debt | $ 5.0 |
Debt instrument, maturity date | Aug. 22, 2019 |
Debt instrument, interest rate, stated percentage | 2.73% |
Convertible advances maturing on November 1, 2019 | Federal Home Loan Bank of Atlanta [Member] |  |
Short-term Debt [Line Items] |  |
Convertible debt | $ 10.0 |
Debt instrument, maturity date | Nov. 01, 2019 |
Debt instrument, interest rate, stated percentage | 2.48% |
Convertible advances maturing on January 17, 2019 | Federal Home Loan Bank of Atlanta [Member] |  |
Short-term Debt [Line Items] |  |
Convertible debt | $ 15.0 |
Debt instrument, maturity date | Jan. 17, 2019 |
Debt instrument, interest rate, stated percentage | 2.49% |
Convertible advances maturing on November 21, 2019 | Federal Home Loan Bank of Atlanta [Member] |  |
Short-term Debt [Line Items] |  |
Convertible debt | $ 15.0 |
Debt instrument, maturity date | Nov. 21, 2019 |
Debt instrument, interest rate, stated percentage | 2.65% |
Financial Bank One [Member] |  |
Short-term Debt [Line Items] |  |
Line of credit, amount available for borrowing | $ 5.0 |
Financial Bank Two [Member] |  |
Short-term Debt [Line Items] |  |
Line of credit, amount available for borrowing | $ 8.0 |
Minimum |  |
Short-term Debt [Line Items] |  |
Weighted average interest rate | 2.57% |
Maximum |  |
Short-term Debt [Line Items] |  |
Weighted average interest rate |  | 2.97%

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