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Goodwill and intangible assets - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 62,523 | $ 52,363
Accumulated Amortization | (38,599) | (34,774)
Net Carrying Amount | 23,924 | 17,589
Core deposit intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 59,835 | 49,675
Accumulated Amortization | (37,403) | (33,861)
Net Carrying Amount | 22,432 | 15,814
Customer base trust intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,600 | 1,600
Accumulated Amortization | (507) | (387)
Net Carrying Amount | 1,093 | 1,213
Manufactured housing servicing intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,088 | 1,088
Accumulated Amortization | (689) | (526)
Net Carrying Amount | $ 399 | $ 562

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