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Acquisition Fair value of assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Apr. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 504,562 |  | $ 256,105
Blue Hills Bancorp, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash |  | $ 56,331 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investments |  | 196,937 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Net |  | 2,073,714 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 24,253 |
Goodwill |  | 248,457 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 19,870 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets |  | 147,836 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets |  | 2,767,398 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 1,930,436 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Borrowings |  | 124,817 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities |  | 50,857 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities |  | 2,106,110 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | $ 661,288 |

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