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Portfolio loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans |  |
Ending balance | $ 6,814,177 | $ 6,687,249
Pass |  |
Loans |  |
Ending balance | 6,016,748 | 5,997,126
Watch |  |
Loans |  |
Ending balance | 554,970 | 413,876
Special Mention |  |
Loans |  |
Ending balance | 150,481 | 181,107
Substandard |  |
Loans |  |
Ending balance | 69,048 | 75,215
Substandard Non-accrual |  |
Loans |  |
Ending balance | 22,930 | 27,896
Commercial |  |
Loans |  |
2020 | 843,404 |
2019 | 190,061 |
2018 | 127,410 |
2017 | 118,185 |
2016 | 72,647 |
Prior | 105,947 |
Revolving loans | 556,922 |
Ending balance | 2,014,576 |
Commercial | Pass |  |
Loans |  |
2020 | 812,536 |
2019 | 158,307 |
2018 | 107,565 |
2017 | 93,190 |
2016 | 61,847 |
Prior | 79,970 |
Revolving loans | 455,340 |
Ending balance | 1,768,755 | 1,458,416
Commercial | Watch |  |
Loans |  |
2020 | 16,544 |
2019 | 22,247 |
2018 | 14,954 |
2017 | 13,724 |
2016 | 2,577 |
Prior | 10,943 |
Revolving loans | 55,959 |
Ending balance | 136,948 | 172,526
Commercial | Special Mention |  |
Loans |  |
2020 | 6,402 |
2019 | 2,671 |
2018 | 2,069 |
2017 | 7,164 |
2016 | 6,763 |
Prior | 13,733 |
Revolving loans | 33,645 |
Ending balance | 72,447 | 66,337
Commercial | Substandard |  |
Loans |  |
2020 | 7,772 |
2019 | 3,791 |
2018 | 2,371 |
2017 | 1,939 |
2016 | 819 |
Prior | 1,233 |
Revolving loans | 9,978 |
Ending balance | 27,903 | 41,273
Commercial | Substandard Non-accrual |  |
Loans |  |
2020 | 150 |
2019 | 3,045 |
2018 | 451 |
2017 | 2,168 |
2016 | 641 |
Prior | 68 |
Revolving loans | 2,000 |
Ending balance | 8,523 | 9,096
Commercial real estate |  |
Loans |  |
2020 | 840,882 |
2019 | 628,303 |
2018 | 463,787 |
2017 | 437,776 |
2016 | 222,941 |
Prior | 278,923 |
Revolving loans | 19,923 |
Ending balance | 2,892,535 |
Commercial real estate | Pass |  |
Loans |  |
2020 | 717,559 |
2019 | 503,977 |
2018 | 360,573 |
2017 | 384,843 |
2016 | 180,555 |
Prior | 227,068 |
Revolving loans | 18,797 |
Ending balance | 2,393,372 | 2,477,398
Commercial real estate | Watch |  |
Loans |  |
2020 | 88,297 |
2019 | 110,526 |
2018 | 90,412 |
2017 | 33,734 |
2016 | 32,887 |
Prior | 27,023 |
Revolving loans | 398 |
Ending balance | 383,277 | 186,963
Commercial real estate | Special Mention |  |
Loans |  |
2020 | 16,490 |
2019 | 8,858 |
2018 | 10,490 |
2017 | 10,505 |
2016 | 7,102 |
Prior | 21,808 |
Revolving loans | 233 |
Ending balance | 75,486 | 105,487
Commercial real estate | Substandard |  |
Loans |  |
2020 | 17,445 |
2019 | 4,166 |
2018 | 1,491 |
2017 | 7,812 |
2016 | 2,111 |
Prior | 1,377 |
Revolving loans | 495 |
Ending balance | 34,897 | 26,204
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
2020 | 1,091 |
2019 | 776 |
2018 | 821 |
2017 | 882 |
2016 | 286 |
Prior | 1,647 |
Ending balance | 5,503 | 9,178
Real estate construction |  |
Loans |  |
2020 | 200,184 |
2019 | 175,330 |
2018 | 64,362 |
2017 | 3,306 |
2016 | 1,071 |
Prior | 1,445 |
Revolving loans | 16,088 |
Ending balance | 461,786 |
Real estate construction | Pass |  |
Loans |  |
2020 | 179,232 |
2019 | 171,663 |
2018 | 64,025 |
2017 | 1,468 |
2016 | 761 |
Prior | 1,444 |
Revolving loans | 16,088 |
Ending balance | 434,681 | 351,923
Real estate construction | Watch |  |
Loans |  |
2020 | 18,485 |
2019 | 3,657 |
2018 | 337 |
2017 | 1,838 |
2016 | 164 |
Ending balance | 24,481 | 45,262
Real estate construction | Special Mention |  |
Loans |  |
2020 | 67 |
2019 | 10 |
Ending balance | 77 | 3,928
Real estate construction | Substandard |  |
Loans |  |
2020 | 2,400 |
2016 | 146 |
Ending balance | 2,546 | 737
Real estate construction | Substandard Non-accrual |  |
Loans |  |
Prior | 1 |
Ending balance | 1 | 630
Retail Real Estate |  |
Loans |  |
2020 | 324,112 |
2019 | 164,938 |
2018 | 137,163 |
2017 | 137,949 |
2016 | 144,101 |
Prior | 263,826 |
Revolving loans | 235,763 |
Ending balance | 1,407,852 |
Retail Real Estate | Pass |  |
Loans |  |
2020 | 319,302 |
2019 | 162,711 |
2018 | 135,065 |
2017 | 136,427 |
2016 | 140,600 |
Prior | 257,147 |
Revolving loans | 231,364 |
Ending balance | 1,382,616 | 1,661,691
Retail Real Estate | Watch |  |
Loans |  |
2020 | 2,715 |
2019 | 2,053 |
2018 | 1,396 |
2017 | 349 |
2016 | 579 |
Prior | 233 |
Revolving loans | 2,939 |
Ending balance | 10,264 | 9,125
Retail Real Estate | Special Mention |  |
Loans |  |
2020 | 509 |
2016 | 1,962 |
Ending balance | 2,471 | 5,355
Retail Real Estate | Substandard |  |
Loans |  |
2020 | 899 |
2019 | 96 |
2018 | 56 |
2017 | 26 |
2016 | 727 |
Prior | 1,631 |
Revolving loans | 267 |
Ending balance | 3,702 | 7,001
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
2020 | 687 |
2019 | 78 |
2018 | 646 |
2017 | 1,147 |
2016 | 233 |
Prior | 4,815 |
Revolving loans | 1,193 |
Ending balance | 8,799 | 8,935
Retail Other |  |
Loans |  |
2020 | 8,371 |
2019 | 9,437 |
2018 | 5,605 |
2017 | 2,531 |
2016 | 696 |
Prior | 497 |
Revolving loans | 10,291 |
Ending balance | 37,428 |
Retail Other | Pass |  |
Loans |  |
2020 | 8,357 |
2019 | 9,430 |
2018 | 5,600 |
2017 | 2,516 |
2016 | 691 |
Prior | 440 |
Revolving loans | 10,290 |
Ending balance | 37,324 | 47,698
Retail Other | Substandard Non-accrual |  |
Loans |  |
2020 | 14 |
2019 | 7 |
2018 | 5 |
2017 | 15 |
2016 | 5 |
Prior | 57 |
Revolving loans | 1 |
Ending balance | 104 | 57
Commercial Loans |  |
Loans |  |
Ending balance | 2,014,576 | 1,748,368
Commercial Real Estate Loans |  |
Loans |  |
Ending balance | 2,892,535 | 2,793,417
Real Estate Construction |  |
Loans |  |
Ending balance | 461,786 | 401,861
Retail Real Estate |  |
Loans |  |
Ending balance | 1,407,852 | 1,693,769
Retail Other |  |
Loans |  |
Ending balance | $ 37,428 | $ 49,834

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