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Portfolio loans - Loans identified as impaired, segregated by category (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | $ 30,365 | $ 45,686
Recorded Investment with No Allowance | 15,421 | 29,540
Recorded Investment with Allowance | 6,273 | 7,539
Total Recorded Investment | 21,694 | 37,079
Related Allowance | 2,404 | 4,853
Average Recorded Investment | 30,150 | 45,370
Collateral dependent loans secured by real estate or business assets | 17,500 |
Commercial Loans |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 15,464 | 14,415
Recorded Investment with No Allowance | 2,554 | 4,727
Recorded Investment with Allowance | 5,205 | 5,026
Total Recorded Investment | 7,759 | 9,753
Related Allowance | 1,694 | 3,330
Average Recorded Investment | 8,746 | 13,774
Commercial Real Estate Loans |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 9,047 | 14,487
Recorded Investment with No Allowance | 7,737 | 9,883
Recorded Investment with Allowance | 594 | 2,039
Total Recorded Investment | 8,331 | 11,922
Related Allowance | 236 | 1,049
Average Recorded Investment | 11,613 | 16,678
Real Estate Construction |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 569 | 1,116
Recorded Investment with No Allowance | 552 | 974
Total Recorded Investment | 552 | 974
Average Recorded Investment | 709 | 873
Retail Real Estate |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 5,285 | 15,581
Recorded Investment with No Allowance | 4,578 | 13,898
Recorded Investment with Allowance | 474 | 474
Total Recorded Investment | 5,052 | 14,372
Related Allowance | 474 | 474
Average Recorded Investment | 9,059 | 14,003
Retail Other |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance |  | 87
Recorded Investment with No Allowance |  | 58
Total Recorded Investment |  | 58
Average Recorded Investment | $ 23 | $ 42

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