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Other Borrowed Funds - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Federal home loan bank stock | $ 6,012 |
Unsecured Lines of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Maximum overnight line of credit facilities available | 24,000 | $ 19,000
Overnight line of credit facilities outstanding | $ 0 | 0
FHLB [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Federal home loan bank advances, maximum borrowing capacity percentage on assets | 30.00% |
Federal home loan bank advance | $ 124,800 | $ 73,100
FHLB [Member] | Line of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Assets pledged with federal home loan bank against credit facilities | 220,600 |
FHLB [Member] | 1-4 Family Residential Loans [Member] | Line of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Assets pledged with federal home loan bank against credit facilities | 44,900 |
FHLB [Member] | Multi-Family Residential Loans [Member] | Line of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Assets pledged with federal home loan bank against credit facilities | 9,600 |
FHLB [Member] | Commercial Real Estate Loans [Member] | Line of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Assets pledged with federal home loan bank against credit facilities | 49,200 |
FHLB [Member] | Securities [Member] | Line of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Assets pledged with federal home loan bank against credit facilities | 58,200 |
FHLB [Member] | Virginia Public Deposits [Member] | Letter of Credit [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Assets pledged with federal home loan bank against credit facilities | $ 10,000 |
FHLB [Member] | Minimum [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Federal home loan bank, advances, interest Rate | 1.69% |
FHLB [Member] | Maximum [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Federal home loan bank, advances, interest Rate | 2.49% |
FHLB [Member] | Restricted Investments [Member] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |
Federal home loan bank stock | $ 6,000 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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