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Portfolio loans - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) loan | Jun. 30, 2018 USD ($) loan | Jun. 30, 2019 USD ($) loan contract | Jun. 30, 2018 USD ($) loan | Dec. 31, 2018 USD ($)
Portfolio Loans |  |  |  |  |
Net deferred loan origination costs | $ 5,400 |  | $ 5,400 |  | $ 5,600
Amount of loan reduction due to net accretable purchase accounting adjustments | 25,000 |  | 25,000 |  | $ 13,900
Gross interest income that would have been recorded if impaired loans had been current | 400 | $ 300 | $ 1,100 | $ 700 |
TDRs subsequently classified as non-performing and had payment defaults |  | 0 | 1 | 0 |
Minimum days past due for TDR loans to be classified as non-performing |  |  | 90 days |  |
Balance of all acquired loans | 1,800,000 |  | $ 1,800,000 |  |
Commercial |  |  |  |  |
Portfolio Loans |  |  |  |  |
Loans classified as a TDR | $ 600 |  | $ 600 |  |
Performing loans classified as TDRs | loan | 1 |  | 1 |  |
Commercial real estate |  |  |  |  |
Portfolio Loans |  |  |  |  |
Loans classified as a TDR | $ 3,200 |  | $ 3,200 |  |
Retail real estate |  |  |  |  |
Portfolio Loans |  |  |  |  |
Loans classified as a TDR |  | $ 100 |  | $ 100 |
Performing loans classified as TDRs | loan |  | 1 |  | 1 |
Loans in the process of foreclosure |  |  | 2,600 |  |
Maximum | Commercial real estate |  |  |  |  |
Portfolio Loans |  |  |  |  |
Limit where loans are processed through an expedited underwriting process |  |  | 1,000 |  |
Pass and watch | Commercial |  |  |  |  |
Portfolio Loans |  |  |  |  |
Limit where loans are processed through an expedited underwriting process |  |  | 350 |  |
Pass and watch | Minimum | Commercial |  |  |  |  |
Portfolio Loans |  |  |  |  |
Limit where loans are processed through an expedited underwriting process |  |  | 350 |  |
Pass and watch | Maximum | Commercial |  |  |  |  |
Portfolio Loans |  |  |  |  |
Limit where loans are processed through an expedited underwriting process |  |  | 1,000 |  |
Watch | Commercial |  |  |  |  |
Portfolio Loans |  |  |  |  |
Limit above which loans are annually reviewed |  |  | 1,000 |  |
Special Mention |  |  |  |  |
Portfolio Loans |  |  |  |  |
Limit above which loans are annually reviewed |  |  | $ 350 |  |

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