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Regulatory Capital Matters (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 30, 2013 | Jan. 01, 2016 | Jan. 01, 2015
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Tangible capital to adjusted total assets | $ 39,773 us-gaap_TangibleCapital | $ 34,035 us-gaap_TangibleCapital |  |  |
Tier 1(Core) capital to adjusted total assets | 39,773 us-gaap_TierOneLeverageCapital | 34,035 us-gaap_TierOneLeverageCapital |  |  |
Total capital to risk weighted assets | 42,870 us-gaap_Capital | 36,845 us-gaap_Capital |  |  |
Tangible capital to adjusted total assets, ratio (as a percent) | 11.34%us-gaap_TangibleCapitalToTangibleAssets | 10.24%us-gaap_TangibleCapitalToTangibleAssets |  |  |
Tier 1(Core) capital to adjusted total assets, ratio (as a percent) | 11.34%us-gaap_TierOneLeverageCapitalToAverageAssets | 10.24%us-gaap_TierOneLeverageCapitalToAverageAssets |  |  |
Total capital to risk weighted assets, ratio (as a percent) | 17.69%us-gaap_CapitalToRiskWeightedAssets | 16.95%us-gaap_CapitalToRiskWeightedAssets |  |  |
Tangible capital required for capital adequacy purposes | 5,260 us-gaap_TangibleCapitalRequiredForCapitalAdequacy | 4,986 us-gaap_TangibleCapitalRequiredForCapitalAdequacy |  |  |
Tier 1(Core) capital to adjusted total assets required for capital adequacy purposes | 14,028 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy | 13,295 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy |  |  |
Total capital to risk weighted assets required for capital adequacy purposes | 19,390 us-gaap_CapitalRequiredForCapitalAdequacy | 17,394 us-gaap_CapitalRequiredForCapitalAdequacy |  |  |
Tangible capital required for capital adequacy purposes, ratio (as a percent) | 1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets | 1.50%us-gaap_TangibleCapitalRequiredForCapitalAdequacyToTangibleAssets |  |  |
Tier 1(Core) capital to adjusted total assets required for capital adequacy purposes, ratio (as a percent) | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets |  |
Total capital to risk weighted assets required for capital adequacy purposes, ratio (as a percent) | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets |  |
Tier 1(Core) capital to adjusted total assets required under consent order | 31,562 byfc_AmountOfTierOneLeverageCapitalRequiredUnderConsentOrder | 29,914 byfc_AmountOfTierOneLeverageCapitalRequiredUnderConsentOrder |  |  |
Total capital to risk weighted assets required under consent order | $ 31,508 byfc_CapitalRequiredUnderConsentOrder | $ 28,286 byfc_CapitalRequiredUnderConsentOrder |  |  |
Tier 1(Core) capital to adjusted total assets required under consent order, ratio (as a percent) | 9.00%byfc_TierOneLeverageCapitalRequiredUnderConsentOrder | 9.00%byfc_TierOneLeverageCapitalRequiredUnderConsentOrder | 9.00%byfc_TierOneLeverageCapitalRequiredUnderConsentOrder |  |
Total Risk-Based Capital to Risk-Weighted Assets, ratio per consent order (as a percent) | 13.00%byfc_CapitalRequiredUnderConsentOrderRatio | 13.00%byfc_CapitalRequiredUnderConsentOrderRatio | 13.00%byfc_CapitalRequiredUnderConsentOrderRatio |  |
Conservation Buffer Rule |  |  |  |  |
Basel III and Dodd Frank Rules |  |  |  |  |
Required minimum conservation buffer percentage |  |  |  | 2.50%byfc_MinimumConservationBufferPercentage / us-gaap_StatementScenarioAxis = byfc_ConservationBufferRuleMember |
Corrective Action Rules |  |  |  |  |
Tier 1 risk based capital required to risk weighted assets for capital adequacy purposes, ratio (as a percent) |  |  |  |  | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Tier 1(Core) capital to adjusted total assets required for capital adequacy purposes, ratio (as a percent) |  |  |  |  | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Total capital to risk weighted assets required for capital adequacy purposes, ratio (as a percent) |  |  |  |  | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Basel III and Dodd Frank Rules |  |  |  |  |
Tier 1 leverage capital required to be well capitalized to average assets (as a percent) |  |  |  |  | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Common equity tier 1 capital required to be well capitalized to risk weighted assets (as a percent) |  |  |  |  | 6.50%byfc_CommonEquityTier1CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Tier 1 risk based capital required to be well capitalized to risk weighted assets (as a percent) |  |  |  |  | 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Total capital required to be well capitalized to risk weighted assets (as a percent) |  |  |  |  | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember
Common equity tier 1 capital to risk weighted assets required for capital adequacy purposes (as a percent |  |  |  |  | 4.50%byfc_CommonEquityTierOneCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / us-gaap_StatementScenarioAxis = byfc_CorrectiveActionRulesMember

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- Definition Tangible capital as defined in the regulations (generally includes outstanding stock plus retained earnings) for banking institutions subject to Office of Thrift Supervision (OTS) capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tangible Capital divided by tangible assets (Tangible Capital Ratio) as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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