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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, 2019 | Dec. 31, 2018
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | $ 57,454 | $ 55,534
Recorded Investment with No Allowance | 35,078 | 33,622
Recorded Investment with Allowance | 15,400 | 16,560
Total Recorded Investment | 50,478 | 50,182
Related Allowance | 5,399 | 5,561
Average Recorded Investment | 48,031 | 46,303
Commercial |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 19,507 | 21,442
Recorded Investment with No Allowance | 5,605 | 6,858
Recorded Investment with Allowance | 10,787 | 12,001
Total Recorded Investment | 16,392 | 18,859
Related Allowance | 4,126 | 4,319
Average Recorded Investment | 15,165 | 13,364
Commercial real estate |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 20,174 | 19,079
Recorded Investment with No Allowance | 13,818 | 13,082
Recorded Investment with Allowance | 4,498 | 4,498
Total Recorded Investment | 18,316 | 17,580
Related Allowance | 1,231 | 1,181
Average Recorded Investment | 18,448 | 18,077
Real estate construction |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 930 | 478
Recorded Investment with No Allowance | 820 | 453
Total Recorded Investment | 820 | 453
Average Recorded Investment | 586 | 712
Retail real estate |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 16,795 | 14,418
Recorded Investment with No Allowance | 14,815 | 13,196
Recorded Investment with Allowance | 115 | 61
Total Recorded Investment | 14,930 | 13,257
Related Allowance | 42 | 61
Average Recorded Investment | 13,792 | 14,110
Retail other |  |
Loans identified as impaired |  |
Unpaid Contractual Principal Balance | 48 | 117
Recorded Investment with No Allowance | 20 | 33
Total Recorded Investment | 20 | 33
Average Recorded Investment | $ 40 | $ 40

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