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Regulatory Matters - Summary of Regulatory Capital Amounts and Ratios (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 capital (to average assets), Actual Ratio | 0.040 |
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 7.00% |
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.050 |
Tier 1 capital (to average assets), For capital adequacy purposes Ratio | 0.085 | 0.0400
Total capital (to risk-weighted assets) For capital adequacy purposes Ratio | 0.105 |
Tier 1 capital (to average assets), To be well capitalized under prompt corrective action Ratio |  | 0.0500
Common equity Tier 1 (to risk-weighted asset), To be well capitalized under prompt corrective action Ratio | 6.50% |
Tier 1 capital (to risk-weighted assets), To be well capitalized under prompt corrective action Ratio | 0.080 |
Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action Ratio | 0.100 |
Capital conservation buffer (as a percent) | 2.50% |
OceanFirst Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 capital (to average assets), Actual Amount | $ 1,027,660 | $ 942,122
Common equity Tier 1 (to risk-weighted asset), Actual Amount | 1,027,660 | 942,122
Tier 1 capital (to risk-weighted assets), Actual Amount | 1,027,660 | 942,122
Total capital (to risk-weighted assets), Actual Amount | $ 1,079,766 | $ 1,004,480
Tier 1 capital (to average assets), Actual Ratio | 0.0908 | 0.0848
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 11.62% | 12.11%
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.1162 | 0.1211
Total capital (to risk-weighted assets), Actual Ratio | 0.1221 | 0.1291
Tier 1 capital (to average assets), For capital adequacy purposes Amount | $ 452,669 | $ 444,648
Common equity Tier 1 (to risk-weighted asset), For capital adequacy purposes Amount | 619,178 | 544,625
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Amount | 751,860 | 661,331
Total capital (to risk-weighted assets), For capital adequacy purposes Amount | $ 928,768 | $ 816,938
Tier 1 capital (to average assets), For capital adequacy purposes Ratio | 0.0400 |
Common equity Tier 1 (to risk-weighted assets), For capital adequacy purposes Ratio | 7.00% | 7.00%
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Ratio | 0.0850 | 0.0850
Total capital (to risk-weighted assets) For capital adequacy purposes Ratio | 0.1050 | 0.1050
Tier 1 capital (to average assets), To be well capitalized under prompt corrective action Amount | $ 565,836 | $ 555,810
Common equity Tier 1 (to risk-weighted asset), To be well capitalized under prompt corrective action Amount | 574,951 | 505,724
Tier 1 capital (to risk-weighted assets), To be well capitalized under prompt corrective action Amount | 707,633 | 622,429
Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action Amount | $ 884,541 | $ 778,036
Tier 1 capital (to average assets), To be well capitalized under prompt corrective action Ratio | 0.0500 |
Common equity Tier 1 (to risk-weighted asset), To be well capitalized under prompt corrective action Ratio | 6.50% | 6.50%
Tier 1 capital (to risk-weighted assets), To be well capitalized under prompt corrective action Ratio | 0.0800 | 0.0800
Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action Ratio | 0.1000 | 0.1000
OceanFirst Financial Corp. |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 capital (to average assets), Actual Amount | $ 1,044,518 | $ 998,273
Common equity Tier 1 (to risk-weighted asset), Actual Amount | 917,088 | 871,385
Tier 1 capital (to risk-weighted assets), Actual Amount | 1,044,518 | 998,273
Total capital (to risk-weighted assets), Actual Amount | $ 1,257,372 | $ 1,230,370
Tier 1 capital (to average assets), Actual Ratio | 0.0922 | 0.0944
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 10.26% | 11.05%
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.1168 | 0.1266
Total capital (to risk-weighted assets), Actual Ratio | 0.1406 | 0.1560
Tier 1 capital (to average assets), For capital adequacy purposes Amount | $ 453,087 | $ 423,028
Common equity Tier 1 (to risk-weighted asset), For capital adequacy purposes Amount | 625,801 | 552,075
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Amount | 759,902 | 670,377
Total capital (to risk-weighted assets), For capital adequacy purposes Amount | $ 938,702 | $ 828,113
Tier 1 capital (to average assets), For capital adequacy purposes Ratio | 0.0400 | 0.0400
Common equity Tier 1 (to risk-weighted assets), For capital adequacy purposes Ratio | 7.00% | 7.00%
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Ratio | 0.0850 | 0.0850
Total capital (to risk-weighted assets) For capital adequacy purposes Ratio | 0.1050 | 0.1050

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