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Regulatory Matters - Schedule of Regulatory Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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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 average assets), For capital adequacy purposes Ratio | 0.085 |
Total capital (to risk-weighted assets) For capital adequacy purposes Ratio | 0.105 |
Capital conservation buffer (as a percent) | 0.0250 | 0.0250
OceanFirst Financial Corp. |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 capital (to average assets), Actual Amount | $ 1,235,832 | $ 1,218,142
Common equity Tier 1 (to risk-weighted asset), Actual Amount | 1,105,180 | 1,088,542
Tier 1 capital (to risk-weighted assets), Actual Amount | 1,235,832 | 1,218,142
Total capital (to risk-weighted assets), Actual Amount | $ 1,437,278 | $ 1,413,400
Tier 1 capital (to average assets), Actual Ratio | 0.0950 | 0.0931
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 11.17% | 10.86%
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.1249 | 0.1215
Total capital (to risk-weighted assets), Actual Ratio | 0.1452 | 0.1410
Tier 1 capital (to average assets), For capital adequacy purposes Amount | $ 520,239 | $ 523,588
Common equity Tier 1 (to risk-weighted asset), For capital adequacy purposes Amount | 692,897 | 701,778
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Amount | 841,375 | 852,159
Total capital (to risk-weighted assets), For capital adequacy purposes Amount | $ 1,039,345 | $ 1,052,667
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
OceanFirst Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 capital (to average assets), Actual Amount | $ 1,161,564 | $ 1,155,896
Common equity Tier 1 (to risk-weighted asset), Actual Amount | 1,161,564 | 1,155,896
Tier 1 capital (to risk-weighted assets), Actual Amount | 1,161,564 | 1,155,896
Total capital (to risk-weighted assets), Actual Amount | $ 1,238,011 | $ 1,226,154
Tier 1 capital (to average assets), Actual Ratio | 0.0899 | 0.0890
Common equity Tier 1 (to risk-weighted assets), Actual Ratio | 11.83% | 11.65%
Tier 1 capital (to risk-weighted assets), Actual Ratio | 0.1183 | 0.1165
Total capital (to risk-weighted assets), Actual Ratio | 0.1261 | 0.1236
Tier 1 capital (to average assets), For capital adequacy purposes Amount | $ 516,798 | $ 519,690
Common equity Tier 1 (to risk-weighted asset), For capital adequacy purposes Amount | 687,383 | 694,620
Tier 1 capital (to risk-weighted assets), For capital adequacy purposes Amount with buffer | 834,679 | 843,467
Total capital (to risk-weighted assets), For capital adequacy purposes Amount | $ 1,031,074 | $ 1,041,930
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 with buffer | 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 | $ 645,998 | $ 649,612
Common equity Tier 1 (to risk-weighted asset), To be well-capitalized under Prompt Corrective Action Amount | 638,284 | 645,004
Tier 1 capital (to risk-weighted assets), To be well-capitalized under Prompt Corrective Action Amount | 785,580 | 793,852
Total capital (to risk-weighted assets), To be well-capitalized under Prompt Corrective Action Amount | $ 981,975 | $ 992,315
Tier 1 capital (to average assets), To be well-capitalized under Prompt Corrective Action Ratio | 0.0500 | 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

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