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Portfolio Loans and allowance for credit losses - Risk grades of portfolio loans by origination year (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans |  |
2021 | $ 1,522,350 |
2020 | 1,616,729 | $ 2,216,953
2019 | 1,049,168 | 1,168,069
2018 | 688,565 | 798,327
2017 | 537,654 | 699,747
2016 |  | 441,456
Prior | 868,553 | 650,638
Revolving loans | 902,631 | 838,987
Ending balance | 7,185,650 | 6,814,177
Pass |  |
Loans |  |
Ending balance | 6,426,332 | 6,016,748
Watch |  |
Loans |  |
Ending balance | 540,258 | 554,970
Special Mention |  |
Loans |  |
Ending balance | 146,235 | 150,481
Substandard |  |
Loans |  |
Ending balance | 45,100 | 69,048
Substandard Non-accrual |  |
Loans |  |
Ending balance | 27,725 | 22,930
Commercial |  |
Loans |  |
2021 | 572,672 |
2020 | 378,163 | 843,404
2019 | 146,310 | 190,061
2018 | 106,744 | 127,410
2017 | 97,835 | 118,185
2016 |  | 72,647
Prior | 157,289 | 105,947
Revolving loans | 595,537 | 556,922
Ending balance | 2,054,550 | 2,014,576
Commercial | Pass |  |
Loans |  |
2021 | 550,732 |
2020 | 363,044 | 812,536
2019 | 118,095 | 158,307
2018 | 94,495 | 107,565
2017 | 79,018 | 93,190
2016 |  | 61,847
Prior | 129,150 | 79,970
Revolving loans | 481,922 | 455,340
Ending balance | 1,816,456 | 1,768,755
Commercial | Watch |  |
Loans |  |
2021 | 11,051 |
2020 | 7,412 | 16,544
2019 | 20,256 | 22,247
2018 | 5,597 | 14,954
2017 | 8,415 | 13,724
2016 |  | 2,577
Prior | 9,830 | 10,943
Revolving loans | 68,800 | 55,959
Ending balance | 131,361 | 136,948
Commercial | Special Mention |  |
Loans |  |
2021 | 2,739 |
2020 | 2,650 | 6,402
2019 | 2,864 | 2,671
2018 | 4,845 | 2,069
2017 | 6,920 | 7,164
2016 |  | 6,763
Prior | 18,111 | 13,733
Revolving loans | 38,577 | 33,645
Ending balance | 76,706 | 72,447
Commercial | Substandard |  |
Loans |  |
2021 | 3,794 |
2020 | 4,588 | 7,772
2019 | 3,504 | 3,791
2018 | 1,807 | 2,371
2017 | 1,338 | 1,939
2016 |  | 819
Prior | 80 | 1,233
Revolving loans | 4,238 | 9,978
Ending balance | 19,349 | 27,903
Commercial | Substandard Non-accrual |  |
Loans |  |
2021 | 4,356 |
2020 | 469 | 150
2019 | 1,591 | 3,045
2018 |  | 451
2017 | 2,144 | 2,168
2016 |  | 641
Prior | 118 | 68
Revolving loans | 2,000 | 2,000
Ending balance | 10,678 | 8,523
Commercial real estate |  |
Loans |  |
2021 | 485,110 |
2020 | 763,300 | 840,882
2019 | 582,526 | 628,303
2018 | 410,571 | 463,787
2017 | 311,926 | 437,776
2016 |  | 222,941
Prior | 346,777 | 278,923
Revolving loans | 20,102 | 19,923
Ending balance | 2,920,312 | 2,892,535
Commercial real estate | Pass |  |
Loans |  |
2021 | 420,841 |
2020 | 691,476 | 717,559
2019 | 441,952 | 503,977
2018 | 313,315 | 360,573
2017 | 269,126 | 384,843
2016 |  | 180,555
Prior | 291,896 | 227,068
Revolving loans | 17,537 | 18,797
Ending balance | 2,446,143 | 2,393,372
Commercial real estate | Watch |  |
Loans |  |
2021 | 39,642 |
2020 | 53,762 | 88,297
2019 | 130,096 | 110,526
2018 | 84,131 | 90,412
2017 | 28,486 | 33,734
2016 |  | 32,887
Prior | 41,473 | 27,023
Revolving loans | 1,956 | 398
Ending balance | 379,546 | 383,277
Commercial real estate | Special Mention |  |
Loans |  |
2021 | 22,415 |
2020 | 7,389 | 16,490
2019 | 6,780 | 8,858
2018 | 9,907 | 10,490
2017 | 10,285 | 10,505
2016 |  | 7,102
Prior | 9,794 | 21,808
Revolving loans | 609 | 233
Ending balance | 67,179 | 75,486
Commercial real estate | Substandard |  |
Loans |  |
2021 | 2,134 |
2020 | 9,898 | 17,445
2019 | 2,465 | 4,166
2018 | 2,397 | 1,491
2017 | 25 | 7,812
2016 |  | 2,111
Prior | 1,760 | 1,377
Revolving loans |  | 495
Ending balance | 18,679 | 34,897
Commercial real estate | Substandard Non-accrual |  |
Loans |  |
2021 | 78 |
2020 | 775 | 1,091
2019 | 1,233 | 776
2018 | 821 | 821
2017 | 4,004 | 882
2016 |  | 286
Prior | 1,854 | 1,647
Ending balance | 8,765 | 5,503
Real estate construction |  |
Loans |  |
2021 | 102,215 |
2020 | 196,512 | 200,184
2019 | 149,425 | 175,330
2018 | 35,033 | 64,362
2017 | 2,616 | 3,306
2016 |  | 1,071
Prior | 1,418 | 1,445
Revolving loans | 13,380 | 16,088
Ending balance | 500,599 | 461,786
Real estate construction | Pass |  |
Loans |  |
2021 | 99,885 |
2020 | 183,938 | 179,232
2019 | 148,531 | 171,663
2018 | 34,750 | 64,025
2017 | 957 | 1,468
2016 |  | 761
Prior | 1,277 | 1,444
Revolving loans | 13,380 | 16,088
Ending balance | 482,718 | 434,681
Real estate construction | Watch |  |
Loans |  |
2021 | 2,330 |
2020 | 10,174 | 18,485
2019 | 886 | 3,657
2018 | 283 | 337
2017 | 1,659 | 1,838
2016 |  | 164
Prior | 141 |
Ending balance | 15,473 | 24,481
Real estate construction | Special Mention |  |
Loans |  |
2020 |  | 67
2019 | 8 | 10
Ending balance | 8 | 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 | 339,821 |
2020 | 250,264 | 324,112
2019 | 135,766 | 164,938
2018 | 112,318 | 137,163
2017 | 112,040 | 137,949
2016 |  | 144,101
Prior | 358,532 | 263,826
Revolving loans | 217,069 | 235,763
Ending balance | 1,525,810 | 1,407,852
Retail Real Estate | Pass |  |
Loans |  |
2021 | 335,450 |
2020 | 246,690 | 319,302
2019 | 133,617 | 162,711
2018 | 110,169 | 135,065
2017 | 110,300 | 136,427
2016 |  | 140,600
Prior | 349,052 | 257,147
Revolving loans | 211,399 | 231,364
Ending balance | 1,496,677 | 1,382,616
Retail Real Estate | Watch |  |
Loans |  |
2021 | 2,925 |
2020 | 2,415 | 2,715
2019 | 2,002 | 2,053
2018 | 1,515 | 1,396
2017 | 305 | 349
2016 |  | 579
Prior | 388 | 233
Revolving loans | 4,328 | 2,939
Ending balance | 13,878 | 10,264
Retail Real Estate | Special Mention |  |
Loans |  |
2021 | 377 |
2020 | 31 | 509
2016 |  | 1,962
Prior | 1,934 |
Ending balance | 2,342 | 2,471
Retail Real Estate | Substandard |  |
Loans |  |
2021 | 730 |
2020 | 967 | 899
2019 | 73 | 96
2018 | 98 | 56
2017 | 235 | 26
2016 |  | 727
Prior | 2,485 | 1,631
Revolving loans | 84 | 267
Ending balance | 4,672 | 3,702
Retail Real Estate | Substandard Non-accrual |  |
Loans |  |
2021 | 339 |
2020 | 161 | 687
2019 | 74 | 78
2018 | 536 | 646
2017 | 1,200 | 1,147
2016 |  | 233
Prior | 4,673 | 4,815
Revolving loans | 1,258 | 1,193
Ending balance | 8,241 | 8,799
Retail Other |  |
Loans |  |
2021 | 22,532 |
2020 | 28,490 | 8,371
2019 | 35,141 | 9,437
2018 | 23,899 | 5,605
2017 | 13,237 | 2,531
2016 |  | 696
Prior | 4,537 | 497
Revolving loans | 56,543 | 10,291
Ending balance | 184,379 | 37,428
Retail Other | Pass |  |
Loans |  |
2021 | 22,532 |
2020 | 28,477 | 8,357
2019 | 35,134 | 9,430
2018 | 23,894 | 5,600
2017 | 13,223 | 2,516
2016 |  | 691
Prior | 4,535 | 440
Revolving loans | 56,543 | 10,290
Ending balance | 184,338 | 37,324
Retail Other | Substandard Non-accrual |  |
Loans |  |
2020 | 13 | 14
2019 | 7 | 7
2018 | 5 | 5
2017 | 14 | 15
2016 |  | 5
Prior | 2 | 57
Revolving loans |  | 1
Ending balance | 41 | 104
Commercial Loans |  |
Loans |  |
Ending balance | 2,054,550 | 2,014,576
Commercial Real Estate Loans |  |
Loans |  |
Ending balance | 2,920,312 | 2,892,535
Real Estate Construction |  |
Loans |  |
Ending balance | 500,599 | 461,786
Retail Real Estate |  |
Loans |  |
Ending balance | 1,525,810 | 1,407,852
Retail Other |  |
Loans |  |
Ending balance | $ 184,379 | $ 37,428

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