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Goodwill and other intangible assets - Components of other intangible assets subject to amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets    
Gross amount $ 27,096 $ 39,695
Finite Lived Intangible Assets Accumulated Amortization 11,637 23,393
Finite-Lived Intangible Assets, Net 15,459 16,302
Core deposits    
Finite-Lived Intangible Assets    
Core deposits - Gross 12,810 12,810
Finite Lived Intangible Assets Accumulated Amortization 8,754 7,473
Finite-Lived Intangible Assets, Net 4,056 5,337
Other customer relationship    
Finite-Lived Intangible Assets    
Customer relationships - Gross 14,286 26,397
Finite Lived Intangible Assets Accumulated Amortization 2,883 15,684
Finite-Lived Intangible Assets, Net $ 11,403 10,713
Trademarks    
Finite-Lived Intangible Assets    
Gross amount   488
Finite Lived Intangible Assets Accumulated Amortization   236
Finite-Lived Intangible Assets, Net   $ 252