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Portfolio loans - Summary of risk grades segregated by category (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans |  |
Portfolio loans | $ 7,121,311 | $ 6,687,249
Pass |  |
Loans |  |
Portfolio loans | 6,421,496 | 5,997,126
Watch |  |
Loans |  |
Portfolio loans | 439,044 | 413,876
Special Mention |  |
Loans |  |
Portfolio loans | 158,929 | 181,107
Substandard |  |
Loans |  |
Portfolio loans | 77,944 | 75,215
Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 23,898 | 27,896
Commercial |  |
Loans |  |
Portfolio loans | 2,281,031 |
Commercial | Pass |  |
Loans |  |
Portfolio loans | 2,011,113 | 1,458,416
Commercial | Watch |  |
Loans |  |
Portfolio loans | 145,817 | 172,526
Commercial | Special Mention |  |
Loans |  |
Portfolio loans | 82,942 | 66,337
Commercial | Substandard |  |
Loans |  |
Portfolio loans | 33,247 | 41,273
Commercial | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 7,912 | 9,096
Commercial real estate |  |
Loans |  |
Portfolio loans | 2,912,408 |
Commercial real estate | Pass |  |
Loans |  |
Portfolio loans | 2,541,455 | 2,477,398
Commercial real estate | Watch |  |
Loans |  |
Portfolio loans | 255,447 | 186,963
Commercial real estate | Special Mention |  |
Loans |  |
Portfolio loans | 71,315 | 105,487
Commercial real estate | Substandard |  |
Loans |  |
Portfolio loans | 37,052 | 26,204
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 7,139 | 9,178
Real estate construction |  |
Loans |  |
Portfolio loans | 407,266 |
Real estate construction | Pass |  |
Loans |  |
Portfolio loans | 376,787 | 351,923
Real estate construction | Watch |  |
Loans |  |
Portfolio loans | 26,820 | 45,262
Real estate construction | Special Mention |  |
Loans |  |
Portfolio loans | 603 | 3,928
Real estate construction | Substandard |  |
Loans |  |
Portfolio loans | 2,797 | 737
Real estate construction | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 259 | 630
Retail Real Estate |  |
Loans |  |
Portfolio loans | 1,480,520 |
Retail Real Estate | Pass |  |
Loans |  |
Portfolio loans | 1,452,145 | 1,661,691
Retail Real Estate | Watch |  |
Loans |  |
Portfolio loans | 10,960 | 9,125
Retail Real Estate | Special Mention |  |
Loans |  |
Portfolio loans | 4,069 | 5,355
Retail Real Estate | Substandard |  |
Loans |  |
Portfolio loans | 4,848 | 7,001
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 8,498 | 8,935
Retail Other |  |
Loans |  |
Portfolio loans | 40,086 |
Retail Other | Pass |  |
Loans |  |
Portfolio loans | 39,996 | 47,698
Retail Other | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 90 | 57
Commercial Loans |  |
Loans |  |
Portfolio loans | 2,281,031 | 1,748,368
Commercial Real Estate Loans |  |
Loans |  |
Portfolio loans | 2,912,408 | 2,793,417
Real Estate Construction |  |
Loans |  |
Portfolio loans | 407,266 | 401,861
Retail Real Estate |  |
Loans |  |
Portfolio loans | 1,480,520 | 1,693,769
Retail Other |  |
Loans |  |
Portfolio loans | $ 40,086 | $ 49,834

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