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Disclosure - Carrying Amounts and Fair Value of Financial Instruments (Significant unobservable inputs used in the fair value measurements) (Details) Sheet http://www.securityfederalbank.com/role/CarryingAmountsandFairValueofFinancialInstrumentsSignificantunobservableinputsusedinthefairvaluemeasurementsDetails Carrying Amounts and Fair Value of Financial Instruments (Significant unobservable inputs used in the fair value measurements) (Details) Details http://www.securityfederalbank.com/role/CarryingAmountsandFairValueofFinancialInstrumentsTables 47 false false R48.htm 2445427 - Disclosure - Carrying Amounts and Fair Value of Financial Instruments (Summary of the carrying value and estimated fair value of financial instruments) (Details) Sheet http://www.securityfederalbank.com/role/CarryingAmountsandFairValueofFinancialInstrumentsSummaryofthecarryingvalueandestimatedfairvalueoffinancialinstrumentsDetails Carrying Amounts and Fair Value of Financial Instruments (Summary of the carrying value and estimated fair value of financial instruments) (Details) Details http://www.securityfederalbank.com/role/CarryingAmountsandFairValueofFinancialInstrumentsTables 48 false false R49.htm 2446428 - Disclosure - Carrying Amounts and Fair Value of Financial Instruments (Narrative) (Details) Sheet http://www.securityfederalbank.com/role/CarryingAmountsandFairValueofFinancialInstrumentsNarrativeDetails Carrying Amounts and Fair Value of Financial Instruments (Narrative) (Details) Details http://www.securityfederalbank.com/role/CarryingAmountsandFairValueofFinancialInstrumentsTables 49 false false R50.htm 2450429 - Disclosure - Non-interest Income (Details) Sheet http://www.securityfederalbank.com/role/NoninterestIncomeDetails Non-interest Income (Details) Details http://www.securityfederalbank.com/role/NoninterestIncomeTables 50 false false All Reports Book All Reports [dq-0542-Deprecated-Concept] Concept CashAndCashEquivalentsPeriodIncreaseDecrease in us-gaap/2021 used in 2 facts was deprecated in us-gaap/2022 as of 2022 and should not be used. sfdl-20220630.htm 4 [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 2 fact(s) appearing in ix:hidden were eligible for transformation: dei:DocumentQuarterlyReport, dei:DocumentTransitionReport - sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:StockholdersEquity with a value of 0 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:StockholdersEquity fact are Context: i33a8e28a217743e38b895a2fd5f7ed92_I20210630, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:StockholdersEquity with a value of 0 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:StockholdersEquity fact are Context: i269828bf66264f90a0608a95600cc8e9_I20201231, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:StockholdersEquity with a value of 0 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:StockholdersEquity fact are Context: ieec68201412845f9a012fb8de17c32f5_I20211231, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:StockholdersEquity with a value of 0 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:StockholdersEquity fact are Context: iefcb15130b8b4ebe993fc0d21de302a9_I20220331, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:StockholdersEquity with a value of 0 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:StockholdersEquity fact are Context: i6c1f610f525e443097b18bcf11a95bb1_I20210331, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:StockholdersEquity with a value of 82949000 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:StockholdersEquity fact are Context: i032df186731442fbaa6e1c524ab8665b_I20220630, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0001-Axis-With-Inappropriate-Members] The fact us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock with a value of 82949000 is dimensionally qualified with the us-gaap:StatementEquityComponentsAxis and the unallowable member us-gaap:RedeemablePreferredStockMember. Base taxonomy member is not allowed by rule. The properties of this us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock fact are Context: i2e47f3cd14494b16b3bfddfbe97e36df_D20220401-20220630, Unit: usd, Rule Element Id: 75. sfdl-20220630.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:PaymentsToAcquireHeldToMaturitySecurities has a value of -84220113 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:PaymentsToAcquireHeldToMaturitySecurities fact are: Context: i2477568c215e4502a72782a106308f36_D20220101-20220630, Unit: usd, Rule Element Id: 3188. sfdl-20220630.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:PaymentsToAcquireHeldToMaturitySecurities has a value of -1941482 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:PaymentsToAcquireHeldToMaturitySecurities fact are: Context: i5f7f5219e06746a4ab514c97822ca1ee_D20210101-20210630, Unit: usd, Rule Element Id: 3188. sfdl-20220630.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:RepaymentsOfShortTermDebt has a value of -145665000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:RepaymentsOfShortTermDebt fact are: Context: i2477568c215e4502a72782a106308f36_D20220101-20220630, Unit: usd, Rule Element Id: 2844. sfdl-20220630.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:RepaymentsOfShortTermDebt has a value of -209565000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:RepaymentsOfShortTermDebt fact are: Context: i5f7f5219e06746a4ab514c97822ca1ee_D20210101-20210630, Unit: usd, Rule Element Id: 2844. sfdl-20220630.htm 4 [dqc-0043-Incorrect-Calculation-Weights-In-Operating-Cash-Flows] The concept IncreaseDecreaseInAccruedInterestReceivableNet is included in the calculation of NetCashProvidedByUsedInOperatingActivities.IncreaseDecreaseInAccruedInterestReceivableNet is a credit balance type concept representing a natural cash outflow in the reconciliation of net income (loss) to NetCashProvidedByUsedInOperatingActivities. A credit balance type concept should always be assigned a negative one (-1) calculation weight as it is a deduction from net income (loss) to reconcile to NetCashProvidedByUsedInOperatingActivities.IncreaseDecreaseInAccruedInterestReceivableNet has been incorrectly provided a positive one (+1) calculation weight in the extension taxonomy. Correct the calculation weight to negative one (-1) and input the value as a positive amount if it is a deduction of a non-cash income or gain, an increase in an asset, or a decrease in a liability. If the value is an add-back of a non-cash expense or loss, decrease in an asset, or an increase in a liability and IncreaseDecreaseInAccruedInterestReceivableNet is the correct concept, input a negative value. Rule Element Id: 7488. https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd 8778, 11614 [dqc-0048-Required-Calculation-Parent-Element-In-The-Cash-Flow-Statement] The filing should include in the cash flow statement calculation linkbase(s) http://www.securityfederalbank.com/role/SubsequentEvents - 2151113 - Disclosure - Subsequent Events one of the following elements as the root(first element) of the calculation tree to represent the aggregate change in cash for the period: CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect, CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect, NetCashProvidedByUsedInContinuingOperations (As long as the element NetCashProvidedByUsedInDiscontinuedOperations is also included the reconciliation between opening and closing cash). The calculation linkbase in the filing has the following root elements defined: CashAndCashEquivalentsPeriodIncreaseDecrease. Rule Element Id: 7482. sfdl-20220630.htm sfdl-20220630.htm sfdl-20220630.xsd sfdl-20220630_cal.xml sfdl-20220630_def.xml sfdl-20220630_lab.xml sfdl-20220630_pre.xml sfdl-20220630xex311.htm sfdl-20220630xex312.htm sfdl-20220630xex32.htm http://fasb.org/us-gaap/2021-01-31 http://xbrl.sec.gov/dei/2021q4 true true