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Subsequent Events (Notes) | 3 Months Ended
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Mar. 31, 2021
Subsequent Events [Abstract] |
Subsequent Events [Text Block] | SUBSEQUENT EVENTS On April 22, 2021, the Company announced the signing of a definitive agreement under which the Company will acquire Meridian Bancorp, Inc. ("Meridian") and Rockland Trust Company will merge with East Boston Savings Bank (the "Merger Agreement"). Under the Merger Agreement each share of Meridian common stock will be exchanged for 0.2750 shares of the Company's common stock. The transaction is intended to qualify as a tax-free reorganization for federal income tax purposes and to provide Meridian stockholders with a tax-free exchange for the Company common stock consideration they will receive in the merger. The Company anticipates issuing approximately 14.2 million shares of its common stock in the merger. Based upon the closing price of $79.57 per share of the Company's common stock on April 21, 2021, the transaction is valued at approximately $1.15 billion. The Boards of Directors of each company unanimously approved the transaction, which is subject to certain conditions, including the receipt of required regulatory approvals, approval of both the stockholders of Meridian and the shareholders of the Company, and other customary conditions.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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