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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, 2020 USD ($) | Dec. 31, 2019 USD ($)
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 | $ 942,122 | $ 779,108
Common equity Tier 1 (to risk-weighted asset), Actual Amount | 942,122 | 779,108
Tier 1 capital (to risk-weighted assets), Actual Amount | 942,122 | 779,108
Total capital (to risk-weighted assets), Actual Amount | $ 1,004,480 | $ 797,339
Tier 1 capital (to average assets), Actual Ratio | 0.0848 | 0.1003
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 12.11% | 12.98%
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.1211 | 0.1298
Total capital (to risk-weighted assets), Actual Ratio | 0.1291 | 0.1329
Tier 1 capital (to average assets), For capital adequacy purposes Amount | $ 444,648 | $ 310,798
Common equity Tier 1 (to risk-weighted asset), For capital adequacy purposes Amount | 544,625 | 420,106
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Amount | 661,331 | 510,129
Total capital (to risk-weighted assets), For capital adequacy purposes Amount | $ 816,938 | $ 630,159
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 | $ 555,810 | $ 388,498
Common equity Tier 1 (to risk-weighted asset), To be well capitalized under prompt corrective action Amount | 505,724 | 390,099
Tier 1 capital (to risk-weighted assets), To be well capitalized under prompt corrective action Amount | 622,429 | 480,121
Total capital (to risk-weighted assets), To be well capitalized under prompt corrective action Amount | $ 778,036 | $ 600,152
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 | $ 998,273 | $ 791,746
Common equity Tier 1 (to risk-weighted asset), Actual Amount | 871,385 | 729,095
Tier 1 capital (to risk-weighted assets), Actual Amount | 998,273 | 791,746
Total capital (to risk-weighted assets), Actual Amount | $ 1,230,370 | $ 844,977
Tier 1 capital (to average assets), Actual Ratio | 0.0944 | 0.1017
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 11.05% | 12.14%
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.1266 | 0.1319
Total capital (to risk-weighted assets), Actual Ratio | 0.1560 | 0.1407
Tier 1 capital (to average assets), For capital adequacy purposes Amount | $ 423,028 | $ 311,289
Common equity Tier 1 (to risk-weighted asset), For capital adequacy purposes Amount | 552,075 | 420,273
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Amount | 670,377 | 510,331
Total capital (to risk-weighted assets), For capital adequacy purposes Amount | $ 828,113 | $ 630,409
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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