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Parent-Only Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 33,064,000 | $ (4,926,000) | $ 18,638,000 | $ 16,533,000 | $ 23,450,000 | $ 24,971,000 | $ 18,980,000 | $ 21,173,000 | $ 63,309,000 | $ 88,574,000 | $ 71,932,000
Net gain on sales of investment securities |  |  |  |  |  |  |  |  | 8,278,000 | 16,000 | 668,000
Amortization of deferred costs on borrowings |  |  |  |  |  |  |  |  |  | 0 |
Net amortization of purchase accounting adjustments |  |  |  |  |  |  |  |  | (21,557,000) | (14,094,000) | (16,733,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 132,656,000 | 100,247,000 | 92,551,000
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (22,169,000) | (172,122,000) | 48,553,000
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of subordinated notes |  |  |  |  |  |  |  |  | 122,180,000 | 0 | 0
Repayments of other borrowings |  |  |  |  |  |  |  |  | (8,109,000) | (263,000) | (439,000)
Dividends paid |  |  |  |  |  |  |  |  | (42,917,000) | (34,241,000) | (29,564,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (14,814,000) | (26,066,000) | (10,837,000)
Net proceeds from the issuance of preferred stock |  |  |  |  |  |  |  |  | 55,529,000 | 0 | 0
Exercise of stock options |  |  |  |  |  |  |  |  | 1,241,000 | 1,335,000 | 5,324,000
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 1,074,948,000 | 82,773,000 | (128,389,000)
Non-cash activities: |  |  |  |  |  |  |  |  |  |  |
Unsettled trades of equity securities |  |  |  |  |  |  |  |  | 8,142,000 | 0 | 0
OceanFirst Financial Corp. |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 63,309,000 | 88,574,000 | 71,932,000
(Increase) decrease in advances to subsidiary Bank |  |  |  |  |  |  |  |  | (73,426,000) | (13,852,000) | 15,262,000
Undistributed earnings of subsidiary Bank |  |  |  |  |  |  |  |  | (4,071,000) | (15,928,000) | (45,556,000)
Net gain on sales of investment securities |  |  |  |  |  |  |  |  | 20,460,000 | 0 | 0
Amortization of deferred costs on borrowings |  |  |  |  |  |  |  |  | 576,000 | 261,000 | 262,000
Net amortization of purchase accounting adjustments |  |  |  |  |  |  |  |  | 638,000 | 453,000 | 395,000
Change in other assets and other liabilities |  |  |  |  |  |  |  |  | 648,000 | (184,000) | 4,076,000
Net cash provided by operating activities |  |  |  |  |  |  |  |  | (32,786,000) | 59,324,000 | 46,371,000
Proceeds from sale of investment securities |  |  |  |  |  |  |  |  | 15,339,000 | 0 | 0
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchase of investment securities |  |  |  |  |  |  |  |  | (95,228,000) | 0 | 0
Increase in ESOP loan receivable |  |  |  |  |  |  |  |  | 0 | 0 | (8,400,000)
Repayments on ESOP loan receivable |  |  |  |  |  |  |  |  | 1,200,000 | 1,160,000 | 1,020,000
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (78,689,000) | 1,160,000 | (7,380,000)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of subordinated notes |  |  |  |  |  |  |  |  | 122,180,000 | 0 | 0
Repayments of other borrowings |  |  |  |  |  |  |  |  | (7,999,000) | 0 | 0
Dividends paid |  |  |  |  |  |  |  |  | (42,917,000) | (34,241,000) | (29,564,000)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (14,814,000) | (26,066,000) | (10,837,000)
Net proceeds from the issuance of preferred stock |  |  |  |  |  |  |  |  | 55,529,000 | 0 | 0
Exercise of stock options |  |  |  |  |  |  |  |  | 1,241,000 | 1,335,000 | 5,324,000
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 113,220,000 | (58,972,000) | (35,077,000)
Net increase in cash and due from banks |  |  |  |  |  |  |  |  | 1,745,000 | 1,512,000 | 3,914,000
Cash and due from banks at beginning of year |  |  |  | $ 5,442,000 |  |  |  | $ 3,930,000 | 5,442,000 | 3,930,000 | 16,000
Cash and due from banks at end of year | $ 7,187,000 |  |  |  | $ 5,442,000 |  |  |  | $ 7,187,000 | $ 5,442,000 | $ 3,930,000

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- Definition The cash inflow from the financed defined contribution plan to acquire shares of the entity. The plan initially holds the shares in a suspense account, which is collateral for the loan. As the plan makes payment on the debt, the shares are released from the suspense account and become available to be allocated to participant accounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from the sale of investments classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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