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Regulatory Matters (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) - BCB Community Bank [Member] $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets): Actual - Amount |  | $ 278,229
Total capital (to risk-weighted assets): Actual - Ratio |  | 0.0985
Total capital (to risk-weighted assets): For Capital Adequacy Purposes - Amount |  | $ 197,169
Total capital (to risk-weighted assets): For Capital Adequacy Purposes - Ratio |  | 0.0700
Total capital (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Amount |  | $ 225,336
Total capital (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Ratio |  | 0.0800
Tier 1 capital (to average assets): Actual - Amount | $ 299,247 |
Tier 1 capital (to average assets): Actual - Ratio | 0.0992 |
Tier 1 capital (to average assets): For Capital Adequacy Purposes - Amount | $ 211,177 |
Tier 1 capital (to average assets): For Capital Adequacy Purposes - Ratio | 0.0700 |
Tier 1 capital (to average assets): To be Well Capitalized under Prompt Corrective Action Provisions - Amount | $ 256,429 |
Tier 1 capital (to average assets): To be Well Capitalized under Prompt Corrective Action Provisions - Ratio | 0.0850 |

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
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- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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