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Business Combinations (Tables) | 12 Months Ended
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Dec. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
Schedule Of Ownership And Market Capitalization Of Combined Company | The following table summarizes the ownership of the combined Company, as well as the market capitalization of the combined company using shares of the Company and Legacy Brookline outstanding at August 31, 2025 and the Company’s closing price on August 31, 2025:
| Number of Company Outstanding Shares |  | Percentage Ownership |  | Market Value at $26.14 Company Share Price (in thousands)
Company Stockholders | 46,389,917 |  |  | 55.18 | % |  | $ | 1,212,169 |
Legacy Brookline Stockholders | 37,673,213 |  |  | 44.82 | % |  | 984,401 |
Total | 84,063,130 |  |  | 100.00 | % |  | $ | 2,196,570 |
Schedule Of Hypothetical Number Of Shares Required For Issuance For Equal Ownership | The following table summarizes the hypothetical number of shares Legacy Brookline would have to issue to give the Company’s owners the same percentage ownership in the combined company (based on shares of Legacy Brookline common stock outstanding at August 31, 2025):
| Number of Legacy Brookline Outstanding Shares |  | Percentage Ownership
Company Stockholders | 110,452,183 |  |  | 55.18 | %
Legacy Brookline Stockholders | 89,698,126 |  |  | 44.82 | %
Total | 200,150,309 |  |  | 100.00 | %
Schedule of Purchase Price Consideration | The purchase price was calculated based on the number of hypothetical shares of Legacy Brookline common stock issued to Company stockholders multiplied by the share price, as summarized in the following table (amounts in thousands):
Number of hypothetical Brookline shares issued to Company Stockholders | 110,452,183 |
Brookline market price per share as of August 31, 2025 | $ | 10.95 |
Purchase price determination of hypothetical Brookline shares issued to Company Stockholders | 1,209,451 |
Value of Company stock options hypothetically converted to options to acquire shares of Brookline common stock | 1,147 |
Fraction share payments | 49 |
Purchase price consideration | $ | 1,210,647 |
Schedule of Assets Acquired and Liabilities Assumed | The following table provides the purchase price allocation as of the Merger Date and the assets acquired and liabilities assumed at their estimated fair value as of the Merger Date as recorded by the Company. The Company recorded the estimate of fair value based on initial valuations available at the Merger Date and these estimates were considered preliminary as of December 31, 2025, and subject to adjustment for up to one year after the Merger Date. While the Company believes the information available on the Merger Date provided a reasonable basis for estimating fair value, the Company expects it may obtain additional information and evidence during the measurement period that would result in changes to the estimated fair value amounts. The measurement period ends on the earlier of one year after the Merger Date or the date the Company is able to determine all necessary information about the facts and circumstances that existed as of the Merger Date has been obtained. As of December 31, 2025, all of the fair value determinations are preliminary with the exception of those assets and liabilities where carrying value has been determined to reasonably represent fair value.
| (In Thousands)
Fair value of consideration transferred: |
Value of hypothetical legacy Brookline shares transferred | $ | 1,209,451 |
Conversion of Company stock options | 1,147 |
Cash paid for fractional shares | 49 |
Total purchase consideration | 1,210,647 |
Fair value of assets acquired: |
Cash and due from banks | 105,440 |
Short-term investments | 978,667 |
Investment securities available-for-sale | 1,102,464 |
Loans held for sale | 3,471 |
Loans held for investment | 9,081,447 |
Premises and equipment | 73,368 |
Bank owned life insurance | 246,979 |
Accrued interest receivable | 49,717 |
Core deposit intangible asset | 174,415 |
Customer relationships intangible asset | 14,000 |
Other assets | 314,345 |
Total assets acquired | 12,144,313 |
Fair value of liabilities assumed: |
Deposits | 10,287,573 |
Borrowings | 559,402 |
Accrued expenses and other liabilities | 197,082 |
Total liabilities assumed | 11,044,057 |
Net assets acquired | 1,100,256 |
Goodwill | $ | 110,391 |
Schedule of Financing Receivable, Purchased With Credit Deterioration | The following table provides a reconciliation between the unpaid principal balance of acquired Purchased-credit deteriorated loans (“PCD”) loans and the purchase price:
(In Thousands) |
Unpaid principal balance | $ | 595,614 |
PCD allowance for credit losses | (64,510) |
Non-credit (discount) premium on acquired loans | (15,761) |
Fair value of PCD loans | $ | 515,343 |
Schedule of Pro Forma Financial Information | The following table presents unaudited pro forma information as if the Transaction had occurred on January 1, 2024. The pro forma adjustments give effect to any change in interest income due to the accretion of the discount (premium) associated with the fair value adjustments to acquired loans, any change in interest expense due to estimated premium amortization/discount accretion associated with the fair value adjustment to acquired interest-bearing deposits and long-term debt and the amortization of the core deposit intangible that would have resulted had the deposits been acquired as of January 1, 2024. The pro forma information is not indicative of what would have occurred had the merger occurred as of the beginning of the year prior to the Merger Date. The pro forma amounts below do not reflect the Company's expectations as of the date of the pro forma information of further operating cost savings and other business synergies expected to be achieved, including revenue growth as a result of the merger and the effects of the balance sheet repositioning completed subsequent to the merger. As a result, actual amounts differed from the unaudited pro forma information presented.
| Unaudited Pro Forma
| December 31,
| 2025 |  | 2024
| (In Thousands)
Net interest income | 796,797 |  |  | 742,222 |
Non-interest income | 105,425 |  |  | 74,029 |
Net income before income taxes | 176,008 |  |  | 52,178 |

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