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Regulatory Matters (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) - BCB Community Bank [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets): Actual - Amount	$ 295,298
Total capital (to risk-weighted assets): Actual - Ratio	13.84%
Total capital (to risk-weighted assets): For Capital Adequacy Purposes - Amount	$ 170,750
Total capital (to risk-weighted assets): For Capital Adequacy Purposes - Ratio	8.00%
Total capital (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Amount	$ 213,437
Total capital (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Ratio	10.00%
Tier 1 capital (to risk-weighted assets): Actual - Amount	$ 271,564
Tier 1 capital (to risk-weighted assets): Actual - Ratio	12.72%
Tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes - Amount	$ 128,062
Tier 1 capital (to risk-weighted assets): For Capital Adequacy Purposes - Ratio	6.00%
Tier 1 capital (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Amount	$ 170,750
Tier 1 capital (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Ratio	8.00%
Common Equity Tier 1 (to risk-weighted assets): Actual - Amount	$ 271,564
Common Equity Tier 1 (to risk-weighted assets): Actual - Ratio	12.72%
Common Equity Tier 1 (to risk-weighted assets): For Capital Adequacy Purposes - Amount	$ 96,047
Common Equity Tier 1 (to risk-weighted assets): For Capital Adequacy Purposes - Ratio	4.50%
Common Equity Tier 1 (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Amount	$ 138,734
Common Equity Tier 1 (to risk-weighted assets): To be Well Capitalized under Prompt Corrective Action Provisions - Ratio	6.50%
Tier 1 capital (to average assets): Actual - Amount	$ 271,564	$ 278,229
Tier 1 capital (to average assets): Actual - Ratio	9.51%	9.85%
Tier 1 capital (to average assets): For Capital Adequacy Purposes - Amount	$ 114,174	$ 197,169
Tier 1 capital (to average assets): For Capital Adequacy Purposes - Ratio	4.00%	7.00%
Tier 1 capital (to average assets): To be Well Capitalized under Prompt Corrective Action Provisions - Amount	$ 142,718	$ 225,336
Tier 1 capital (to average assets): To be Well Capitalized under Prompt Corrective Action Provisions - Ratio	5.00%	8.00%

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