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Portfolio Loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans |  |
2021 | $ 1,872,128 |
2020 | 1,432,087 | $ 2,216,953
2019 | 977,044 | 1,168,069
2018 | 595,136 | 798,327
2017 | 500,258 | 699,747
2016 |  | 441,456
Prior | 770,563 | 650,638
Revolving loans | 1,003,419 | 838,987
Ending balance | 7,150,635 | 6,814,177
Pass |  |
Loans |  |
Ending balance | 6,448,171 | 6,016,748
Watch |  |
Loans |  |
Ending balance | 479,566 | 554,970
Special Mention |  |
Loans |  |
Ending balance | 145,634 | 150,481
Substandard |  |
Loans |  |
Ending balance | 51,895 | 69,048
Substandard Non-accrual |  |
Loans |  |
Ending balance | 25,369 | 22,930
Commercial |  |
Loans |  |
2021 | 494,584 |
2020 | 275,649 | 843,404
2019 | 139,989 | 190,061
2018 | 101,782 | 127,410
2017 | 91,027 | 118,185
2016 |  | 72,647
Prior | 154,513 | 105,947
Revolving loans | 674,318 | 556,922
Ending balance | 1,931,863 | 2,014,576
Commercial | Pass |  |
Loans |  |
2021 | 468,833 |
2020 | 265,204 | 812,536
2019 | 112,809 | 158,307
2018 | 90,292 | 107,565
2017 | 73,553 | 93,190
2016 |  | 61,847
Prior | 132,127 | 79,970
Revolving loans | 575,580 | 455,340
Ending balance | 1,718,398 | 1,768,755
Commercial | Watch |  |
Loans |  |
2021 | 15,078 |
2020 | 5,355 | 16,544
2019 | 19,783 | 22,247
2018 | 5,668 | 14,954
2017 | 7,545 | 13,724
2016 |  | 2,577
Prior | 4,287 | 10,943
Revolving loans | 57,392 | 55,959
Ending balance | 115,108 | 136,948
Commercial | Special Mention |  |
Loans |  |
2021 | 3,011 |
2020 | 1,143 | 6,402
2019 | 2,479 | 2,671
2018 | 4,385 | 2,069
2017 | 6,864 | 7,164
2016 |  | 6,763
Prior | 12,484 | 13,733
Revolving loans | 31,728 | 33,645
Ending balance | 62,094 | 72,447
Commercial | Substandard |  |
Loans |  |
2021 | 3,357 |
2020 | 3,504 | 7,772
2019 | 3,321 | 3,791
2018 | 1,437 | 2,371
2017 | 1,244 | 1,939
2016 |  | 819
Prior | 5,552 | 1,233
Revolving loans | 7,618 | 9,978
Ending balance | 26,033 | 27,903
Commercial | Substandard Non-accrual |  |
Loans |  |
2021 | 4,305 |
2020 | 444 | 150
2019 | 1,597 | 3,045
2018 |  | 451
2017 | 1,821 | 2,168
2016 |  | 641
Prior | 63 | 68
Revolving loans | 2,000 | 2,000
Ending balance | 10,230 | 8,523
Commercial real estate |  |
Loans |  |
2021 | 729,627 |
2020 | 747,753 | 840,882
2019 | 603,588 | 628,303
2018 | 374,403 | 463,787
2017 | 299,213 | 437,776
2016 |  | 222,941
Prior | 291,250 | 278,923
Revolving loans | 22,787 | 19,923
Ending balance | 3,068,622 | 2,892,535
Commercial real estate | Pass |  |
Loans |  |
2021 | 655,907 |
2020 | 690,244 | 717,559
2019 | 463,830 | 503,977
2018 | 289,396 | 360,573
2017 | 257,618 | 384,843
2016 |  | 180,555
Prior | 245,795 | 227,068
Revolving loans | 20,453 | 18,797
Ending balance | 2,623,243 | 2,393,372
Commercial real estate | Watch |  |
Loans |  |
2021 | 41,596 |
2020 | 40,404 | 88,297
2019 | 130,282 | 110,526
2018 | 62,312 | 90,412
2017 | 27,226 | 33,734
2016 |  | 32,887
Prior | 34,572 | 27,023
Revolving loans | 1,878 | 398
Ending balance | 338,270 | 383,277
Commercial real estate | Special Mention |  |
Loans |  |
2021 | 27,115 |
2020 | 7,056 | 16,490
2019 | 7,551 | 8,858
2018 | 18,661 | 10,490
2017 | 10,436 | 10,505
2016 |  | 7,102
Prior | 10,430 | 21,808
Revolving loans | 276 | 233
Ending balance | 81,525 | 75,486
Commercial real estate | Substandard |  |
Loans |  |
2021 | 4,894 |
2020 | 9,289 | 17,445
2019 | 1,574 | 4,166
2018 | 2,072 | 1,491
2017 | 526 | 7,812
2016 |  | 2,111
Prior | 429 | 1,377
Revolving loans | 180 | 495
Ending balance | 18,964 | 34,897
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
2021 | 114 |
2020 | 761 | 1,091
2019 | 352 | 776
2018 | 1,962 | 821
2017 | 3,407 | 882
2016 |  | 286
Prior | 24 | 1,647
Ending balance | 6,620 | 5,503
Real estate construction |  |
Loans |  |
2021 | 166,999 |
2020 | 150,214 | 200,184
2019 | 93,763 | 175,330
2018 | 4,193 | 64,362
2017 | 2,516 | 3,306
2016 |  | 1,071
Prior | 1,372 | 1,445
Revolving loans | 11,801 | 16,088
Ending balance | 430,857 | 461,786
Real estate construction | Pass |  |
Loans |  |
2021 | 160,719 |
2020 | 141,699 | 179,232
2019 | 93,701 | 171,663
2018 | 3,918 | 64,025
2017 | 899 | 1,468
2016 |  | 761
Prior | 1,249 | 1,444
Revolving loans | 11,801 | 16,088
Ending balance | 413,986 | 434,681
Real estate construction | Watch |  |
Loans |  |
2021 | 6,279 |
2020 | 6,115 | 18,485
2019 | 55 | 3,657
2018 | 276 | 337
2017 | 1,616 | 1,838
2016 |  | 164
Prior | 123 |
Ending balance | 14,464 | 24,481
Real estate construction | Special Mention |  |
Loans |  |
2020 |  | 67
2019 | 7 | 10
Ending balance | 7 | 77
Real estate construction | Substandard |  |
Loans |  |
2020 | 2,400 | 2,400
2016 |  | 146
Ending balance | 2,400 | 2,546
Real estate construction | Substandard Non-accrual |  |
Loans |  |
Prior |  | 1
Ending balance |  | 1
Retail Real Estate |  |
Loans |  |
2021 | 435,305 |
2020 | 233,281 | 324,112
2019 | 109,330 | 164,938
2018 | 95,015 | 137,163
2017 | 97,553 | 137,949
2016 |  | 144,101
Prior | 320,771 | 263,826
Revolving loans | 221,629 | 235,763
Ending balance | 1,512,884 | 1,407,852
Retail Real Estate | Pass |  |
Loans |  |
2021 | 428,556 |
2020 | 230,120 | 319,302
2019 | 107,262 | 162,711
2018 | 92,875 | 135,065
2017 | 95,667 | 136,427
2016 |  | 140,600
Prior | 313,708 | 257,147
Revolving loans | 217,984 | 231,364
Ending balance | 1,486,172 | 1,382,616
Retail Real Estate | Watch |  |
Loans |  |
2021 | 2,641 |
2020 | 2,666 | 2,715
2019 | 1,982 | 2,053
2018 | 1,521 | 1,396
2017 | 352 | 349
2016 |  | 579
Prior | 270 | 233
Revolving loans | 2,292 | 2,939
Ending balance | 11,724 | 10,264
Retail Real Estate | Special Mention |  |
Loans |  |
2021 | 1,979 |
2020 | 29 | 509
2016 |  | 1,962
Ending balance | 2,008 | 2,471
Retail Real Estate | Substandard |  |
Loans |  |
2021 | 1,630 |
2020 | 321 | 899
2019 | 14 | 96
2018 | 73 | 56
2017 | 166 | 26
2016 |  | 727
Prior | 2,210 | 1,631
Revolving loans | 84 | 267
Ending balance | 4,498 | 3,702
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
2021 | 500 |
2020 | 145 | 687
2019 | 72 | 78
2018 | 546 | 646
2017 | 1,369 | 1,147
2016 |  | 233
Prior | 4,582 | 4,815
Revolving loans | 1,268 | 1,193
Ending balance | 8,482 | 8,799
Retail Other |  |
Loans |  |
2021 | 45,614 |
2020 | 25,188 | 8,371
2019 | 30,373 | 9,437
2018 | 19,742 | 5,605
2017 | 9,949 | 2,531
2016 |  | 696
Prior | 2,658 | 497
Revolving loans | 72,885 | 10,291
Ending balance | 206,409 | 37,428
Retail Other | Pass |  |
Loans |  |
2021 | 45,614 |
2020 | 25,177 | 8,357
2019 | 30,366 | 9,430
2018 | 19,737 | 5,600
2017 | 9,935 | 2,516
2016 |  | 691
Prior | 2,658 | 440
Revolving loans | 72,885 | 10,290
Ending balance | 206,372 | 37,324
Retail Other | Substandard Non-accrual |  |
Loans |  |
2020 | 11 | 14
2019 | 7 | 7
2018 | 5 | 5
2017 | 14 | 15
2016 |  | 5
Prior |  | 57
Revolving loans |  | 1
Ending balance | 37 | 104
Commercial Loans |  |
Loans |  |
Ending balance | 1,931,863 | 2,014,576
Commercial Real Estate Loans |  |
Loans |  |
Ending balance | 3,068,622 | 2,892,535
Real Estate Construction |  |
Loans |  |
Ending balance | 430,857 | 461,786
Retail Real Estate |  |
Loans |  |
Ending balance | 1,512,884 | 1,407,852
Retail Other |  |
Loans |  |
Ending balance | $ 206,409 | $ 37,428

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