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Goodwill and other intangibles (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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 | 4,986,000 | 6,316,000 | 4,986,000 | 6,316,000 | 5,320,000 | 5,975,000 | 6,657,000 | 7,462,000
Amortization of Intangible Assets | 334,000 | 341,000 | 989,000 | 1,146,000 |  |  |  |
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 | 10,770,000 |  | 10,770,000 |  |  | 9,781,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 334,000 |  | 334,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 1,215,000 |  | 1,215,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 1,042,000 |  | 1,042,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 887,000 |  | 887,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 754,000 |  | 754,000 |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 15,756,000 |  | 15,756,000 |  |  | 15,756,000 |  |
Intangible Assets, Net (Including Goodwill) | 164,581,000 | $ 165,911,000 | 164,581,000 | $ 165,911,000 | $ 164,915,000 | 165,570,000 | $ 166,252,000 | $ 167,057,000
Core Deposits [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 9,470,000 |  | 9,470,000 |  |  | 8,481,000 |  |
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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