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Portfolio loans - Summary of risk grades segregated by category (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans |  |
Portfolio loans | $ 7,229,020 | $ 6,687,249
Pass |  |
Loans |  |
Portfolio loans | 6,521,097 | 5,997,126
Watch |  |
Loans |  |
Portfolio loans | 406,674 | 413,876
Special Mention |  |
Loans |  |
Portfolio loans | 192,417 | 181,107
Substandard |  |
Loans |  |
Portfolio loans | 83,737 | 75,215
Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 25,095 | 27,896
Commercial |  |
Loans |  |
Portfolio loans | 2,357,954 |
Commercial | Pass |  |
Loans |  |
Portfolio loans | 2,078,284 | 1,458,416
Commercial | Watch |  |
Loans |  |
Portfolio loans | 136,817 | 172,526
Commercial | Special Mention |  |
Loans |  |
Portfolio loans | 94,439 | 66,337
Commercial | Substandard |  |
Loans |  |
Portfolio loans | 41,978 | 41,273
Commercial | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 6,436 | 9,096
Commercial real estate |  |
Loans |  |
Portfolio loans | 2,847,014 |
Commercial real estate | Pass |  |
Loans |  |
Portfolio loans | 2,476,189 | 2,477,398
Commercial real estate | Watch |  |
Loans |  |
Portfolio loans | 233,826 | 186,963
Commercial real estate | Special Mention |  |
Loans |  |
Portfolio loans | 93,676 | 105,487
Commercial real estate | Substandard |  |
Loans |  |
Portfolio loans | 34,314 | 26,204
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 9,009 | 9,178
Real estate construction |  |
Loans |  |
Portfolio loans | 433,031 |
Real estate construction | Pass |  |
Loans |  |
Portfolio loans | 405,327 | 351,923
Real estate construction | Watch |  |
Loans |  |
Portfolio loans | 23,907 | 45,262
Real estate construction | Special Mention |  |
Loans |  |
Portfolio loans | 685 | 3,928
Real estate construction | Substandard |  |
Loans |  |
Portfolio loans | 2,832 | 737
Real estate construction | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 280 | 630
Retail Real Estate |  |
Loans |  |
Portfolio loans | 1,548,215 |
Retail Real Estate | Pass |  |
Loans |  |
Portfolio loans | 1,518,644 | 1,661,691
Retail Real Estate | Watch |  |
Loans |  |
Portfolio loans | 12,124 | 9,125
Retail Real Estate | Special Mention |  |
Loans |  |
Portfolio loans | 3,617 | 5,355
Retail Real Estate | Substandard |  |
Loans |  |
Portfolio loans | 4,613 | 7,001
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 9,217 | 8,935
Retail Other |  |
Loans |  |
Portfolio loans | 42,806 |
Retail Other | Pass |  |
Loans |  |
Portfolio loans | 42,653 | 47,698
Retail Other | Substandard Non-accrual |  |
Loans |  |
Portfolio loans | 153 | 57
Commercial Loans |  |
Loans |  |
Portfolio loans | 2,357,954 | 1,748,368
Commercial Real Estate Loans |  |
Loans |  |
Portfolio loans | 2,847,014 | 2,793,417
Real Estate Construction |  |
Loans |  |
Portfolio loans | 433,031 | 401,861
Retail Real Estate |  |
Loans |  |
Portfolio loans | 1,548,215 | 1,693,769
Retail Other |  |
Loans |  |
Portfolio loans | $ 42,806 | $ 49,834

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