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Portfolio loans - Narrative (Details) | 3 Months Ended
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Mar. 31, 2020 USD ($) loan | Mar. 31, 2019 USD ($) loan
Distributions of portfolio loans |  |
Gross interest income that would have been recorded if impaired loans had been current | $ 500,000 | $ 700,000
Loans classified as a TDR |  | $ 0
TDRs subsequently classified as non-performing and had payment defaults | loan | 0 | 0
Commercial Loans |  |
Distributions of portfolio loans |  |
Loans classified as a TDR | $ 500,000 |
Commercial Real Estate Loans |  |
Distributions of portfolio loans |  |
Loans classified as a TDR | 700,000 |
Retail Real Estate |  |
Distributions of portfolio loans |  |
Loans classified as a TDR |  | $ 3,100,000
Performing loans classified as TDRs | loan |  | 1
Loans in the process of foreclosure | 1,300,000 |
Maximum | Commercial Real Estate Loans |  |
Distributions of portfolio loans |  |
Limit where loans are processed through an expedited underwriting process | 1,000,000.0 |
Watch | Commercial Loans |  |
Distributions of portfolio loans |  |
Limit above which loans are annually reviewed | 1,000,000.0 |
Special Mention |  |
Distributions of portfolio loans |  |
Limit above which loans are annually reviewed | $ 350,000 |

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