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Portfolio loans - Summary of risk grades segregated by category (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans |  |
Portfolio loans | $ 6,745,499 | $ 6,687,249
Pass |  |
Loans |  |
Portfolio loans | 6,078,957 | 5,997,126
Watch |  |
Loans |  |
Portfolio loans | 370,337 | 413,876
Special Mention |  |
Loans |  |
Portfolio loans | 192,470 | 181,107
Substandard |  |
Loans |  |
Portfolio loans | 78,063 | 75,215
Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 25,672 | 27,896
Commercial |  |
Loans |  |
Portfolio loans | 1,767,191 |
Commercial | Pass |  |
Loans |  |
Portfolio loans | 1,481,538 | 1,458,416
Commercial | Watch |  |
Loans |  |
Portfolio loans | 150,303 | 172,526
Commercial | Special Mention |  |
Loans |  |
Portfolio loans | 85,231 | 66,337
Commercial | Substandard |  |
Loans |  |
Portfolio loans | 42,727 | 41,273
Commercial | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 7,392 | 9,096
Commercial real estate |  |
Loans |  |
Portfolio loans | 2,825,003 |
Commercial real estate | Pass |  |
Loans |  |
Portfolio loans | 2,509,301 | 2,477,398
Commercial real estate | Watch |  |
Loans |  |
Portfolio loans | 178,151 | 186,963
Commercial real estate | Special Mention |  |
Loans |  |
Portfolio loans | 100,365 | 105,487
Commercial real estate | Substandard |  |
Loans |  |
Portfolio loans | 28,245 | 26,204
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 8,941 | 9,178
Real estate construction |  |
Loans |  |
Portfolio loans | 448,313 |
Real estate construction | Pass |  |
Loans |  |
Portfolio loans | 415,302 | 351,923
Real estate construction | Watch |  |
Loans |  |
Portfolio loans | 28,808 | 45,262
Real estate construction | Special Mention |  |
Loans |  |
Portfolio loans | 3,222 | 3,928
Real estate construction | Substandard |  |
Loans |  |
Portfolio loans | 699 | 737
Real estate construction | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 282 | 630
Retail Real Estate |  |
Loans |  |
Portfolio loans | 1,656,628 |
Retail Real Estate | Pass |  |
Loans |  |
Portfolio loans | 1,624,543 | 1,661,691
Retail Real Estate | Watch |  |
Loans |  |
Portfolio loans | 13,075 | 9,125
Retail Real Estate | Special Mention |  |
Loans |  |
Portfolio loans | 3,652 | 5,355
Retail Real Estate | Substandard |  |
Loans |  |
Portfolio loans | 6,387 | 7,001
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 8,971 | 8,935
Retail Other |  |
Loans |  |
Portfolio loans | 48,364 |
Retail Other | Pass |  |
Loans |  |
Portfolio loans | 48,273 | 47,698
Retail Other | Substandard |  |
Loans |  |
Portfolio loans | 5 |
Retail Other | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 86 | 57
Commercial Loans |  |
Loans |  |
Portfolio loans | 1,767,191 | 1,748,368
Commercial Real Estate Loans |  |
Loans |  |
Portfolio loans | 2,825,003 | 2,793,417
Real Estate Construction |  |
Loans |  |
Portfolio loans | 448,313 | 401,861
Retail Real Estate |  |
Loans |  |
Portfolio loans | 1,656,628 | 1,693,769
Retail Other |  |
Loans |  |
Portfolio loans | $ 48,364 | $ 49,834

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