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Portfolio loans - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans |  |
Ending balance | $ 7,121,311 | $ 6,687,249
Pass |  |
Loans |  |
Ending balance | 6,421,496 | 5,997,126
Watch |  |
Loans |  |
Ending balance | 439,044 | 413,876
Special Mention |  |
Loans |  |
Ending balance | 158,929 | 181,107
Substandard |  |
Loans |  |
Ending balance | 77,944 | 75,215
Substandard Non-accrual |  |
Loans |  |
Ending balance | 23,898 | 27,896
Commercial |  |
Loans |  |
2020 | 1,068,734 |
2019 | 203,895 |
2018 | 139,632 |
2017 | 127,152 |
2016 | 79,541 |
Prior | 117,060 |
Revolving loans | 545,017 |
Ending balance | 2,281,031 |
Commercial | Pass |  |
Loans |  |
2020 | 1,029,324 |
2019 | 173,103 |
2018 | 117,434 |
2017 | 100,388 |
2016 | 67,473 |
Prior | 87,096 |
Revolving loans | 436,295 |
Ending balance | 2,011,113 | 1,458,416
Commercial | Watch |  |
Loans |  |
2020 | 24,601 |
2019 | 21,566 |
2018 | 16,918 |
2017 | 14,606 |
2016 | 3,488 |
Prior | 13,653 |
Revolving loans | 50,985 |
Ending balance | 145,817 | 172,526
Commercial | Special Mention |  |
Loans |  |
2020 | 6,011 |
2019 | 2,572 |
2018 | 2,166 |
2017 | 7,181 |
2016 | 6,853 |
Prior | 14,949 |
Revolving loans | 43,210 |
Ending balance | 82,942 | 66,337
Commercial | Substandard |  |
Loans |  |
2020 | 8,450 |
2019 | 3,578 |
2018 | 2,528 |
2017 | 4,437 |
2016 | 935 |
Prior | 1,292 |
Revolving loans | 12,027 |
Ending balance | 33,247 | 41,273
Commercial | Substandard Non-accrual |  |
Loans |  |
2020 | 348 |
2019 | 3,076 |
2018 | 586 |
2017 | 540 |
2016 | 792 |
Prior | 70 |
Revolving loans | 2,500 |
Ending balance | 7,912 | 9,096
Commercial real estate |  |
Loans |  |
2020 | 638,670 |
2019 | 657,742 |
2018 | 496,672 |
2017 | 489,529 |
2016 | 245,647 |
Prior | 359,689 |
Revolving loans | 24,459 |
Ending balance | 2,912,408 |
Commercial real estate | Pass |  |
Loans |  |
2020 | 557,205 |
2019 | 565,460 |
2018 | 425,448 |
2017 | 439,438 |
2016 | 215,498 |
Prior | 315,026 |
Revolving loans | 23,380 |
Ending balance | 2,541,455 | 2,477,398
Commercial real estate | Watch |  |
Loans |  |
2020 | 52,304 |
2019 | 71,844 |
2018 | 62,609 |
2017 | 28,787 |
2016 | 21,629 |
Prior | 18,186 |
Revolving loans | 88 |
Ending balance | 255,447 | 186,963
Commercial real estate | Special Mention |  |
Loans |  |
2020 | 8,429 |
2019 | 14,981 |
2018 | 5,479 |
2017 | 12,664 |
2016 | 6,096 |
Prior | 23,170 |
Revolving loans | 496 |
Ending balance | 71,315 | 105,487
Commercial real estate | Substandard |  |
Loans |  |
2020 | 19,809 |
2019 | 4,662 |
2018 | 1,197 |
2017 | 7,165 |
2016 | 2,137 |
Prior | 1,587 |
Revolving loans | 495 |
Ending balance | 37,052 | 26,204
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
2020 | 923 |
2019 | 795 |
2018 | 1,939 |
2017 | 1,475 |
2016 | 287 |
Prior | 1,720 |
Ending balance | 7,139 | 9,178
Real estate construction |  |
Loans |  |
2020 | 128,757 |
2019 | 192,531 |
2018 | 63,144 |
2017 | 3,418 |
2016 | 889 |
Prior | 1,871 |
Revolving loans | 16,656 |
Ending balance | 407,266 |
Real estate construction | Pass |  |
Loans |  |
2020 | 107,927 |
2019 | 188,254 |
2018 | 60,326 |
2017 | 1,188 |
2016 | 568 |
Prior | 1,868 |
Revolving loans | 16,656 |
Ending balance | 376,787 | 351,923
Real estate construction | Watch |  |
Loans |  |
2020 | 17,661 |
2019 | 4,266 |
2018 | 2,515 |
2017 | 2,205 |
2016 | 173 |
Ending balance | 26,820 | 45,262
Real estate construction | Special Mention |  |
Loans |  |
2020 | 592 |
2019 | 11 |
Ending balance | 603 | 3,928
Real estate construction | Substandard |  |
Loans |  |
2020 | 2,577 |
2018 | 47 |
2017 | 25 |
2016 | 148 |
Ending balance | 2,797 | 737
Real estate construction | Substandard Non-accrual |  |
Loans |  |
2018 | 256 |
Prior | 3 |
Ending balance | 259 | 630
Retail Real Estate |  |
Loans |  |
2020 | 277,755 |
2019 | 183,070 |
2018 | 155,124 |
2017 | 159,871 |
2016 | 161,165 |
Prior | 301,328 |
Revolving loans | 242,207 |
Ending balance | 1,480,520 |
Retail Real Estate | Pass |  |
Loans |  |
2020 | 273,752 |
2019 | 180,799 |
2018 | 152,772 |
2017 | 158,192 |
2016 | 157,611 |
Prior | 293,570 |
Revolving loans | 235,449 |
Ending balance | 1,452,145 | 1,661,691
Retail Real Estate | Watch |  |
Loans |  |
2020 | 1,570 |
2019 | 2,090 |
2018 | 1,255 |
2017 | 320 |
2016 | 570 |
Prior | 255 |
Revolving loans | 4,900 |
Ending balance | 10,960 | 9,125
Retail Real Estate | Special Mention |  |
Loans |  |
2020 | 516 |
2018 | 70 |
2017 | 589 |
2016 | 1,975 |
Prior | 919 |
Ending balance | 4,069 | 5,355
Retail Real Estate | Substandard |  |
Loans |  |
2020 | 1,642 |
2019 | 100 |
2018 | 330 |
2017 | 82 |
2016 | 770 |
Prior | 1,655 |
Revolving loans | 269 |
Ending balance | 4,848 | 7,001
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
2020 | 275 |
2019 | 81 |
2018 | 697 |
2017 | 688 |
2016 | 239 |
Prior | 4,929 |
Revolving loans | 1,589 |
Ending balance | 8,498 | 8,935
Retail Other |  |
Loans |  |
2020 | 6,989 |
2019 | 10,702 |
2018 | 6,798 |
2017 | 3,338 |
2016 | 962 |
Prior | 841 |
Revolving loans | 10,456 |
Ending balance | 40,086 |
Retail Other | Pass |  |
Loans |  |
2020 | 6,974 |
2019 | 10,695 |
2018 | 6,798 |
2017 | 3,336 |
2016 | 961 |
Prior | 777 |
Revolving loans | 10,455 |
Ending balance | 39,996 | 47,698
Retail Other | Substandard Non-accrual |  |
Loans |  |
2020 | 15 |
2019 | 7 |
2017 | 2 |
2016 | 1 |
Prior | 64 |
Revolving loans | 1 |
Ending balance | 90 | 57
Commercial Loans |  |
Loans |  |
Ending balance | 2,281,031 | 1,748,368
Commercial Real Estate Loans |  |
Loans |  |
Ending balance | 2,912,408 | 2,793,417
Real Estate Construction |  |
Loans |  |
Ending balance | 407,266 | 401,861
Retail Real Estate |  |
Loans |  |
Ending balance | 1,480,520 | 1,693,769
Retail Other |  |
Loans |  |
Ending balance | $ 40,086 | $ 49,834

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