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Portfolio Loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans |  |
2021 | $ 833,596 |
2020 | 1,813,648 | $ 2,216,953
2019 | 1,071,108 | 1,168,069
2018 | 725,875 | 798,327
2017 | 588,923 | 699,747
2016 |  | 441,456
Prior | 926,024 | 650,638
Revolving loans | 820,126 | 838,987
Ending balance | 6,779,300 | 6,814,177
Pass |  |
Loans |  |
Ending balance | 5,981,995 | 6,016,748
Watch |  |
Loans |  |
Ending balance | 560,431 | 554,970
Special Mention |  |
Loans |  |
Ending balance | 149,831 | 150,481
Substandard |  |
Loans |  |
Ending balance | 65,337 | 69,048
Substandard Non-accrual |  |
Loans |  |
Ending balance | 21,706 | 22,930
Commercial |  |
Loans |  |
2021 | 395,625 |
2020 | 564,556 | 843,404
2019 | 160,763 | 190,061
2018 | 115,910 | 127,410
2017 | 108,086 | 118,185
2016 |  | 72,647
Prior | 159,371 | 105,947
Revolving loans | 563,060 | 556,922
Ending balance | 2,067,371 | 2,014,576
Commercial | Pass |  |
Loans |  |
2021 | 388,147 |
2020 | 536,074 | 812,536
2019 | 131,127 | 158,307
2018 | 97,322 | 107,565
2017 | 88,238 | 93,190
2016 |  | 61,847
Prior | 126,916 | 79,970
Revolving loans | 462,239 | 455,340
Ending balance | 1,830,063 | 1,768,755
Commercial | Watch |  |
Loans |  |
2021 | 4,830 |
2020 | 14,828 | 16,544
2019 | 18,085 | 22,247
2018 | 6,890 | 14,954
2017 | 9,185 | 13,724
2016 |  | 2,577
Prior | 12,947 | 10,943
Revolving loans | 56,625 | 55,959
Ending balance | 123,390 | 136,948
Commercial | Special Mention |  |
Loans |  |
2021 | 2,061 |
2020 | 4,241 | 6,402
2019 | 5,590 | 2,671
2018 | 8,369 | 2,069
2017 | 6,680 | 7,164
2016 |  | 6,763
Prior | 18,831 | 13,733
Revolving loans | 32,774 | 33,645
Ending balance | 78,546 | 72,447
Commercial | Substandard |  |
Loans |  |
2021 | 587 |
2020 | 8,912 | 7,772
2019 | 3,569 | 3,791
2018 | 2,993 | 2,371
2017 | 1,815 | 1,939
2016 |  | 819
Prior | 125 | 1,233
Revolving loans | 9,422 | 9,978
Ending balance | 27,423 | 27,903
Commercial | Substandard Non-accrual |  |
Loans |  |
2020 | 501 | 150
2019 | 2,392 | 3,045
2018 | 336 | 451
2017 | 2,168 | 2,168
2016 |  | 641
Prior | 552 | 68
Revolving loans | 2,000 | 2,000
Ending balance | 7,949 | 8,523
Commercial real estate |  |
Loans |  |
2021 | 230,724 |
2020 | 849,553 | 840,882
2019 | 608,651 | 628,303
2018 | 445,498 | 463,787
2017 | 356,979 | 437,776
2016 |  | 222,941
Prior | 402,150 | 278,923
Revolving loans | 19,411 | 19,923
Ending balance | 2,912,966 | 2,892,535
Commercial real estate | Pass |  |
Loans |  |
2021 | 195,095 |
2020 | 732,186 | 717,559
2019 | 462,732 | 503,977
2018 | 342,786 | 360,573
2017 | 315,383 | 384,843
2016 |  | 180,555
Prior | 334,934 | 227,068
Revolving loans | 17,330 | 18,797
Ending balance | 2,400,446 | 2,393,372
Commercial real estate | Watch |  |
Loans |  |
2021 | 13,209 |
2020 | 91,440 | 88,297
2019 | 133,721 | 110,526
2018 | 89,517 | 90,412
2017 | 29,142 | 33,734
2016 |  | 32,887
Prior | 48,557 | 27,023
Revolving loans | 1,658 | 398
Ending balance | 407,244 | 383,277
Commercial real estate | Special Mention |  |
Loans |  |
2021 | 19,920 |
2020 | 9,818 | 16,490
2019 | 7,902 | 8,858
2018 | 9,949 | 10,490
2017 | 7,172 | 10,505
2016 |  | 7,102
Prior | 13,716 | 21,808
Revolving loans | 423 | 233
Ending balance | 68,900 | 75,486
Commercial real estate | Substandard |  |
Loans |  |
2021 | 2,500 |
2020 | 15,325 | 17,445
2019 | 3,557 | 4,166
2018 | 2,425 | 1,491
2017 | 4,400 | 7,812
2016 |  | 2,111
Prior | 3,005 | 1,377
Revolving loans |  | 495
Ending balance | 31,212 | 34,897
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
2020 | 784 | 1,091
2019 | 739 | 776
2018 | 821 | 821
2017 | 882 | 882
2016 |  | 286
Prior | 1,938 | 1,647
Ending balance | 5,164 | 5,503
Real estate construction |  |
Loans |  |
2021 | 42,845 |
2020 | 181,545 | 200,184
2019 | 147,217 | 175,330
2018 | 39,627 | 64,362
2017 | 2,949 | 3,306
2016 |  | 1,071
Prior | 1,836 | 1,445
Revolving loans | 6,614 | 16,088
Ending balance | 422,633 | 461,786
Real estate construction | Pass |  |
Loans |  |
2021 | 40,766 |
2020 | 167,230 | 179,232
2019 | 143,555 | 171,663
2018 | 39,297 | 64,025
2017 | 1,164 | 1,468
2016 |  | 761
Prior | 1,680 | 1,444
Revolving loans | 6,614 | 16,088
Ending balance | 400,306 | 434,681
Real estate construction | Watch |  |
Loans |  |
2021 | 2,079 |
2020 | 11,915 | 18,485
2019 | 3,653 | 3,657
2018 | 330 | 337
2017 | 1,785 | 1,838
2016 |  | 164
Prior | 156 |
Ending balance | 19,918 | 24,481
Real estate construction | Special Mention |  |
Loans |  |
2020 |  | 67
2019 | 9 | 10
Ending balance | 9 | 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 | 162,388 |
2020 | 211,145 | 324,112
2019 | 146,408 | 164,938
2018 | 120,183 | 137,163
2017 | 118,946 | 137,949
2016 |  | 144,101
Prior | 361,809 | 263,826
Revolving loans | 222,420 | 235,763
Ending balance | 1,343,299 | 1,407,852
Retail Real Estate | Pass |  |
Loans |  |
2021 | 161,016 |
2020 | 207,536 | 319,302
2019 | 144,201 | 162,711
2018 | 118,052 | 135,065
2017 | 117,359 | 136,427
2016 |  | 140,600
Prior | 351,700 | 257,147
Revolving loans | 218,383 | 231,364
Ending balance | 1,318,247 | 1,382,616
Retail Real Estate | Watch |  |
Loans |  |
2021 | 189 |
2020 | 2,557 | 2,715
2019 | 2,040 | 2,053
2018 | 1,407 | 1,396
2017 | 291 | 349
2016 |  | 579
Prior | 846 | 233
Revolving loans | 2,549 | 2,939
Ending balance | 9,879 | 10,264
Retail Real Estate | Special Mention |  |
Loans |  |
2021 | 377 |
2020 | 33 | 509
2018 | 18 |
2016 |  | 1,962
Prior | 1,948 |
Ending balance | 2,376 | 2,471
Retail Real Estate | Substandard |  |
Loans |  |
2021 | 323 |
2020 | 882 | 899
2019 | 91 | 96
2018 | 56 | 56
2017 | 168 | 26
2016 |  | 727
Prior | 2,497 | 1,631
Revolving loans | 285 | 267
Ending balance | 4,302 | 3,702
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
2021 | 483 |
2020 | 137 | 687
2019 | 76 | 78
2018 | 650 | 646
2017 | 1,128 | 1,147
2016 |  | 233
Prior | 4,818 | 4,815
Revolving loans | 1,203 | 1,193
Ending balance | 8,495 | 8,799
Retail Other |  |
Loans |  |
2021 | 2,014 |
2020 | 6,849 | 8,371
2019 | 8,069 | 9,437
2018 | 4,657 | 5,605
2017 | 1,963 | 2,531
2016 |  | 696
Prior | 858 | 497
Revolving loans | 8,621 | 10,291
Ending balance | 33,031 | 37,428
Retail Other | Pass |  |
Loans |  |
2021 | 2,014 |
2020 | 6,835 | 8,357
2019 | 8,062 | 9,430
2018 | 4,652 | 5,600
2017 | 1,949 | 2,516
2016 |  | 691
Prior | 800 | 440
Revolving loans | 8,621 | 10,290
Ending balance | 32,933 | 37,324
Retail Other | Substandard Non-accrual |  |
Loans |  |
2020 | 14 | 14
2019 | 7 | 7
2018 | 5 | 5
2017 | 14 | 15
2016 |  | 5
Prior | 58 | 57
Revolving loans |  | 1
Ending balance | 98 | 104
Commercial Loans |  |
Loans |  |
Ending balance | 2,067,371 | 2,014,576
Commercial Real Estate Loans |  |
Loans |  |
Ending balance | 2,912,966 | 2,892,535
Real Estate Construction |  |
Loans |  |
Ending balance | 422,633 | 461,786
Retail Real Estate |  |
Loans |  |
Ending balance | 1,343,299 | 1,407,852
Retail Other |  |
Loans |  |
Ending balance | $ 33,031 | $ 37,428

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