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Portfolio loans - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans |  |
Ending balance | $ 7,229,020 | $ 6,687,249
Pass |  |
Loans |  |
Ending balance | 6,521,097 | 5,997,126
Watch |  |
Loans |  |
Ending balance | 406,674 | 413,876
Special Mention |  |
Loans |  |
Ending balance | 192,417 | 181,107
Substandard |  |
Loans |  |
Ending balance | 83,737 | 75,215
Substandard Non-accrual |  |
Loans |  |
Ending balance | 25,095 | 27,896
Commercial |  |
Loans |  |
2020 | 972,237 |
2019 | 228,310 |
2018 | 167,794 |
2017 | 151,219 |
2016 | 91,521 |
Prior | 127,981 |
Revolving loans | 618,892 |
Ending balance | 2,357,954 |
Commercial | Pass |  |
Loans |  |
2020 | 931,544 |
2019 | 193,072 |
2018 | 139,275 |
2017 | 129,906 |
2016 | 79,484 |
Prior | 94,852 |
Revolving loans | 510,151 |
Ending balance | 2,078,284 | 1,458,416
Commercial | Watch |  |
Loans |  |
2020 | 23,426 |
2019 | 22,915 |
2018 | 20,322 |
2017 | 8,145 |
2016 | 3,017 |
Prior | 15,488 |
Revolving loans | 43,504 |
Ending balance | 136,817 | 172,526
Commercial | Special Mention |  |
Loans |  |
2020 | 5,947 |
2019 | 5,442 |
2018 | 3,226 |
2017 | 7,039 |
2016 | 6,930 |
Prior | 15,579 |
Revolving loans | 50,276 |
Ending balance | 94,439 | 66,337
Commercial | Substandard |  |
Loans |  |
2020 | 11,291 |
2019 | 3,222 |
2018 | 4,258 |
2017 | 5,588 |
2016 | 1,286 |
Prior | 1,372 |
Revolving loans | 14,961 |
Ending balance | 41,978 | 41,273
Commercial | Substandard Non-accrual |  |
Loans |  |
2020 | 29 |
2019 | 3,659 |
2018 | 713 |
2017 | 541 |
2016 | 804 |
Prior | 690 |
Ending balance | 6,436 | 9,096
Commercial real estate |  |
Loans |  |
2020 | 385,739 |
2019 | 669,802 |
2018 | 543,329 |
2017 | 546,061 |
2016 | 263,134 |
Prior | 407,453 |
Revolving loans | 31,496 |
Ending balance | 2,847,014 |
Commercial real estate | Pass |  |
Loans |  |
2020 | 315,356 |
2019 | 577,080 |
2018 | 473,528 |
2017 | 496,679 |
2016 | 226,747 |
Prior | 357,509 |
Revolving loans | 29,290 |
Ending balance | 2,476,189 | 2,477,398
Commercial real estate | Watch |  |
Loans |  |
2020 | 40,462 |
2019 | 69,029 |
2018 | 44,938 |
2017 | 28,018 |
2016 | 27,333 |
Prior | 23,329 |
Revolving loans | 717 |
Ending balance | 233,826 | 186,963
Commercial real estate | Special Mention |  |
Loans |  |
2020 | 12,212 |
2019 | 16,494 |
2018 | 17,895 |
2017 | 14,233 |
2016 | 6,800 |
Prior | 24,553 |
Revolving loans | 1,489 |
Ending balance | 93,676 | 105,487
Commercial real estate | Substandard |  |
Loans |  |
2020 | 17,409 |
2019 | 5,862 |
2018 | 3,216 |
2017 | 5,635 |
2016 | 1,863 |
Prior | 329 |
Ending balance | 34,314 | 26,204
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
2020 | 300 |
2019 | 1,337 |
2018 | 3,752 |
2017 | 1,496 |
2016 | 391 |
Prior | 1,733 |
Ending balance | 9,009 | 9,178
Real estate construction |  |
Loans |  |
2020 | 74,004 |
2019 | 210,358 |
2018 | 125,235 |
2017 | 3,697 |
2016 | 762 |
Prior | 1,304 |
Revolving loans | 17,671 |
Ending balance | 433,031 |
Real estate construction | Pass |  |
Loans |  |
2020 | 61,660 |
2019 | 200,254 |
2018 | 122,501 |
2017 | 1,535 |
2016 | 407 |
Prior | 1,299 |
Revolving loans | 17,671 |
Ending balance | 405,327 | 351,923
Real estate construction | Watch |  |
Loans |  |
2020 | 9,071 |
2019 | 10,092 |
2018 | 2,411 |
2017 | 2,128 |
2016 | 205 |
Ending balance | 23,907 | 45,262
Real estate construction | Special Mention |  |
Loans |  |
2020 | 673 |
2019 | 12 |
Ending balance | 685 | 3,928
Real estate construction | Substandard |  |
Loans |  |
2020 | 2,600 |
2018 | 48 |
2017 | 34 |
2016 | 150 |
Ending balance | 2,832 | 737
Real estate construction | Substandard Non-accrual |  |
Loans |  |
2018 | 275 |
Prior | 5 |
Ending balance | 280 | 630
Retail Real Estate |  |
Loans |  |
2020 | 235,525 |
2019 | 189,596 |
2018 | 176,098 |
2017 | 177,869 |
2016 | 171,858 |
Prior | 348,711 |
Revolving loans | 248,558 |
Ending balance | 1,548,215 |
Retail Real Estate | Pass |  |
Loans |  |
2020 | 232,130 |
2019 | 186,986 |
2018 | 172,855 |
2017 | 176,644 |
2016 | 167,885 |
Prior | 340,407 |
Revolving loans | 241,737 |
Ending balance | 1,518,644 | 1,661,691
Retail Real Estate | Watch |  |
Loans |  |
2020 | 1,102 |
2019 | 2,221 |
2018 | 1,943 |
2017 | 333 |
2016 | 986 |
Prior | 722 |
Revolving loans | 4,817 |
Ending balance | 12,124 | 9,125
Retail Real Estate | Special Mention |  |
Loans |  |
2020 | 526 |
2018 | 174 |
2016 | 1,988 |
Prior | 929 |
Ending balance | 3,617 | 5,355
Retail Real Estate | Substandard |  |
Loans |  |
2020 | 1,487 |
2019 | 214 |
2018 | 333 |
2017 | 160 |
2016 | 751 |
Prior | 1,216 |
Revolving loans | 452 |
Ending balance | 4,613 | 7,001
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
2020 | 280 |
2019 | 175 |
2018 | 793 |
2017 | 732 |
2016 | 248 |
Prior | 5,437 |
Revolving loans | 1,552 |
Ending balance | 9,217 | 8,935
Retail Other |  |
Loans |  |
2020 | 6,164 |
2019 | 12,367 |
2018 | 8,099 |
2017 | 4,081 |
2016 | 1,270 |
Prior | 1,147 |
Revolving loans | 9,678 |
Ending balance | 42,806 |
Retail Other | Pass |  |
Loans |  |
2020 | 6,101 |
2019 | 12,360 |
2018 | 8,099 |
2017 | 4,079 |
2016 | 1,253 |
Prior | 1,084 |
Revolving loans | 9,677 |
Ending balance | 42,653 | 47,698
Retail Other | Substandard Non-accrual |  |
Loans |  |
2020 | 63 |
2019 | 7 |
2017 | 2 |
2016 | 17 |
Prior | 63 |
Revolving loans | 1 |
Ending balance | 153 | 57
Commercial Loans |  |
Loans |  |
Ending balance | 2,357,954 | 1,748,368
Commercial Real Estate Loans |  |
Loans |  |
Ending balance | 2,847,014 | 2,793,417
Real Estate Construction |  |
Loans |  |
Ending balance | 433,031 | 401,861
Retail Real Estate |  |
Loans |  |
Ending balance | 1,548,215 | 1,693,769
Retail Other |  |
Loans |  |
Ending balance | $ 42,806 | $ 49,834

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