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Goodwill and other intangibles (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 159,595,000 | $ 159,595,000 | $ 159,595,000 | $ 159,595,000 | $ 159,595,000 | $ 159,595,000 | $ 159,595,000 | $ 159,595,000
Other Intangible Assets, Net | 7,882,000 | 9,785,000 | 7,882,000 | 9,785,000 | 8,302,000 | 9,260,000 | 10,310,000 | 11,523,000
Amortization of Intangible Assets | 420,000 | 525,000 | 1,378,000 | 1,738,000 |  |  |  |
Finite-lived Intangible Assets Acquired | 14,456,000 |  | 14,456,000 |  |  | 14,456,000 |  |
Indefinite-lived Intangible Assets Acquired | 1,300,000 |  | 1,300,000 |  |  | 1,300,000 |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 7,874,000 |  | 7,874,000 |  |  | 6,496,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 420,000 |  | 420,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 1,487,000 |  | 1,487,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 1,323,000 |  | 1,323,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 1,215,000 |  | 1,215,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 1,042,000 |  | 1,042,000 |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 15,756,000 |  | 15,756,000 |  |  | 15,756,000 |  |
Intangible Assets, Net (Including Goodwill) | 167,477,000 | $ 169,380,000 | 167,477,000 | $ 169,380,000 | $ 167,897,000 | 168,855,000 | $ 169,905,000 | $ 171,118,000
Core Deposits [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 6,574,000 |  | 6,574,000 |  |  | 5,196,000 |  |
Trade Names [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 1,300,000 |  | $ 1,300,000 |  |  | $ 1,300,000 |  |

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