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Borrowings - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Line Of Credit Facility [Line Items] |  |
Federal Home Loan Bank (FHLB) advances | $ 49,020,000 | $ 19,117,000
Fair value adjustment |  | 1,100,000
Advances from FHLB collateralized by certain loans | 328,600,000 | 309,900,000
Investment in FHLB stock | 2,200,000 | 1,300,000
FHLB advances book value |  | 1,800,000
Line of credit amount outstanding | 8,000,000.0 | 16,000,000.0
Paycheck protection program liquidity facility (PPPLF) borrowings |  | 100,813,000
Small Business Administration |  |
Line Of Credit Facility [Line Items] |  |
Secured payroll protection program loans | 0 | 101,700,000
Federal Reserve Bank of Atlanta | Small Business Administration |  |
Line Of Credit Facility [Line Items] |  |
Paycheck protection program liquidity facility (PPPLF) borrowings |  | $ 100,800,000
Payroll protection program loans, fixed interest rate |  | 0.35%
Federal Reserve Bank of Atlanta | Small Business Administration | Minimum |  |
Line Of Credit Facility [Line Items] |  |
Payroll protection program loans, maturity period |  | 2 years
Federal Reserve Bank of Atlanta | Small Business Administration | Maximum |  |
Line Of Credit Facility [Line Items] |  |
Payroll protection program loans, maturity period |  | 5 years
Revolving Credit Facility | First National Bankers Bank |  |
Line Of Credit Facility [Line Items] |  |
Line of credit amount outstanding | $ 0 | $ 5,000,000.0
Line of credit, term | 10 years |
Line of credit, frequency of payment and payment terms | Interest payment were due quarterly and the initial principal payment was due June 29, 2021. |
Line of credit, initial principal payment due date | Jun. 29, 2021 |
Line of credit, prepayment penalty | $ 0 |

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- Definition Advances from federal home loan banks book value. + References No definition available. + Details
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- Definition Line of credit, initial principal payment due date. + References No definition available. + Details
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- Definition Line of credit, prepayment penalty. + References No definition available. + Details
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- Definition Payroll protection program loans. + References No definition available. + Details
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- Definition Payroll protection program loans, fixed interest rate. + References No definition available. + Details
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- Definition Payroll protection program loans, maturity period. + References No definition available. + Details
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- Definition Secured payroll protection program loans. + References No definition available. + Details
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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 Amount of the collateral pledged in support of federal home loan bank advances outstanding. + 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 (d) -URI http://asc.fasb.org/extlink&oid=123599511&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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- Definition Amount of accumulated increase (decrease) on advances made and reported by Federal Home Loan Bank (FHLBank) from fair value option adjustments. + References No definition available. + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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