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Portfolio loans and allowance for loan losses - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) loan contract | Dec. 31, 2018 USD ($) item contract | Dec. 31, 2017 USD ($)
Distributions of portfolio loans |  |  |
Gross interest income that would have been recorded if impaired loans had been current | $ 2,300 | $ 1,700 | $ 1,400
Performing loans classified as TDRs | contract |  | 0 |
Minimum days past due for TDR loans to be classified as non-performing | 90 days |  |
Balance of all acquired loans | $ 1,700,000 | $ 1,200,000 | $ 1,800,000
Commercial Loans |  |  |
Distributions of portfolio loans |  |  |
Performing loans classified as TDRs | loan | 1 |  |
Retail Real Estate |  |  |
Distributions of portfolio loans |  |  |
TDRs subsequently classified as non-performing and had payment defaults | contract | 1 |  |
Maximum | Commercial Real Estate Loans |  |  |
Distributions of portfolio loans |  |  |
Limit where loans are processed through an expedited underwriting process | $ 1,000 |  |
Watch | Commercial Loans |  |  |
Distributions of portfolio loans |  |  |
Limit above which loans are annually reviewed | 1,000 |  |
Special Mention |  |  |
Distributions of portfolio loans |  |  |
Limit above which loans are annually reviewed | 350 |  |
In compliance with modified terms | Retail Real Estate |  |  |
Distributions of portfolio loans |  |  |
Number of retail real estate modifications | item |  | 1 |
Loans classified as a TDR | $ 300 | $ 100 |

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