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Portfolio loans - Loans identified as impaired, segregated by category (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | $ 32,008 | $ 45,686
Recorded Investment with No Allowance | 20,021 | 29,540
Recorded Investment with Allowance | 5,351 | 7,539
Total Recorded Investment | 25,372 | 37,079
Related Allowance | 3,938 | 4,853
Average Recorded Investment | 40,408 | 45,370
Collateral dependent loans secured by real estate or business assets | 13,500 |
Commercial Loans |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 11,795 | 14,415
Recorded Investment with No Allowance | 3,751 | 4,727
Recorded Investment with Allowance | 3,671 | 5,026
Total Recorded Investment | 7,422 | 9,753
Related Allowance | 2,822 | 3,330
Average Recorded Investment | 11,493 | 13,774
Commercial Real Estate Loans |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 11,992 | 14,487
Recorded Investment with No Allowance | 9,111 | 9,883
Recorded Investment with Allowance | 1,206 | 2,039
Total Recorded Investment | 10,317 | 11,922
Related Allowance | 642 | 1,049
Average Recorded Investment | 15,226 | 16,678
Real Estate Construction |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 579 | 1,116
Recorded Investment with No Allowance | 562 | 974
Total Recorded Investment | 562 | 974
Average Recorded Investment | 888 | 873
Retail Real Estate |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 7,642 | 15,581
Recorded Investment with No Allowance | 6,597 | 13,898
Recorded Investment with Allowance | 474 | 474
Total Recorded Investment | 7,071 | 14,372
Related Allowance | 474 | 474
Average Recorded Investment | 12,767 | 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 | $ 34 | $ 42

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
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