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Portfolio loans - Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance | $ 84,384 | $ 50,915 | $ 53,748 | $ 50,648 |  |
Provision for loan losses | 12,891 | 2,517 | 30,107 | 4,628 |  |
Charged-off | (1,702) | (2,941) | (5,850) | (5,410) |  |
Recoveries | 473 | 884 | 1,208 | 1,509 |  |
Ending balance | 96,046 | 51,375 | 96,046 | 51,375 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | $ 2,208 | $ 4,853
Loans collectively evaluated for impairment |  |  |  |  | 93,838 | 48,895
Ending balance | 84,384 | 51,375 | 53,748 | 51,375 | 96,046 | 53,748
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 22,106 | 34,031
Loans collectively evaluated for impairment |  |  |  |  | 7,204,321 | 6,650,170
PCI loans evaluated for impairment |  |  |  |  | 2,593 | 3,048
Ending balance |  |  |  |  | 7,229,020 | 6,687,249
Commercial Loans |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance | 22,725 | 17,998 | 18,291 | 17,829 |  |
Provision for loan losses | 2,473 | 1,161 | 8,146 | 2,954 |  |
Charged-off | (1,140) | (2,563) | (3,182) | (4,370) |  |
Recoveries | 88 | 137 | 176 | 320 |  |
Ending balance | 24,146 | 16,733 | 24,146 | 16,733 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 1,248 | 3,330
Loans collectively evaluated for impairment |  |  |  |  | 22,898 | 14,961
Ending balance | 24,146 | 16,733 | 18,291 | 17,829 | 24,146 | 18,291
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 6,263 | 9,740
Loans collectively evaluated for impairment |  |  |  |  | 2,351,687 | 1,738,615
PCI loans evaluated for impairment |  |  |  |  | 4 | 13
Ending balance |  |  |  |  | 2,357,954 | 1,748,368
Commercial Real Estate Loans |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance | 35,967 | 20,097 | 21,190 | 21,137 |  |
Provision for loan losses | 6,861 | (97) | 13,387 | (1,186) |  |
Charged-off | (165) |  | (1,264) | (15) |  |
Recoveries | 17 | 188 | 61 | 252 |  |
Ending balance | 42,680 | 20,188 | 42,680 | 20,188 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 486 | 1,049
Loans collectively evaluated for impairment |  |  |  |  | 42,194 | 20,141
Ending balance | 42,680 | 20,188 | 21,190 | 20,188 | 42,680 | 21,190
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 10,105 | 10,018
Loans collectively evaluated for impairment |  |  |  |  | 2,834,987 | 2,781,495
PCI loans evaluated for impairment |  |  |  |  | 1,922 | 1,904
Ending balance |  |  |  |  | 2,847,014 | 2,793,417
Real Estate Construction |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance | 7,193 | 2,807 | 3,204 | 2,723 |  |
Provision for loan losses | 574 | 411 | 1,463 | 413 |  |
Recoveries | 25 | 87 | 171 | 169 |  |
Ending balance | 7,792 | 3,305 | 7,792 | 3,305 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans collectively evaluated for impairment |  |  |  |  | 7,792 | 3,204
Ending balance | 7,792 | 3,305 | 3,204 | 3,305 | 7,792 | 3,204
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 559 | 539
Loans collectively evaluated for impairment |  |  |  |  | 432,217 | 400,887
PCI loans evaluated for impairment |  |  |  |  | 255 | 435
Ending balance |  |  |  |  | 433,031 | 401,861
Retail Real Estate |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance | 17,454 | 9,503 | 10,495 | 8,471 |  |
Provision for loan losses | 2,981 | 941 | 7,018 | 2,298 |  |
Charged-off | (292) | (200) | (1,000) | (717) |  |
Recoveries | 262 | 369 | 600 | 561 |  |
Ending balance | 20,405 | 10,613 | 20,405 | 10,613 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 474 | 474
Loans collectively evaluated for impairment |  |  |  |  | 19,931 | 10,021
Ending balance | 20,405 | 10,613 | 10,495 | 10,613 | 20,405 | 10,495
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 5,179 | 13,676
Loans collectively evaluated for impairment |  |  |  |  | 1,542,624 | 1,679,397
PCI loans evaluated for impairment |  |  |  |  | 412 | 696
Ending balance |  |  |  |  | 1,548,215 | 1,693,769
Retail Other |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance | 1,045 | 510 | 568 | 488 |  |
Provision for loan losses | 2 | 101 | 93 | 149 |  |
Charged-off | (105) | (178) | (404) | (308) |  |
Recoveries | 81 | 103 | 200 | 207 |  |
Ending balance | 1,023 | 536 | 1,023 | 536 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans collectively evaluated for impairment |  |  |  |  | 1,023 | 568
Ending balance | 1,023 | $ 536 | 568 | $ 536 | 1,023 | 568
Loans: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  | 58
Loans collectively evaluated for impairment |  |  |  |  | 42,806 | 49,776
Ending balance |  |  |  |  | 42,806 | 49,834
Post ASC 326 |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Ending balance | 16,833 |  | 16,833 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance | 16,833 |  | 16,833 |  | 16,833 |
Post ASC 326 | Commercial Loans |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Ending balance | 715 |  | 715 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance | 715 |  | 715 |  | 715 |
Post ASC 326 | Commercial Real Estate Loans |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Ending balance | 9,306 |  | 9,306 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance | 9,306 |  | 9,306 |  | 9,306 |
Post ASC 326 | Real Estate Construction |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Ending balance | 2,954 |  | 2,954 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance | 2,954 |  | 2,954 |  | 2,954 |
Post ASC 326 | Retail Real Estate |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Ending balance | 3,292 |  | 3,292 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance | 3,292 |  | 3,292 |  | 3,292 |
Post ASC 326 | Retail Other |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Ending balance | 566 |  | 566 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance | $ 566 |  | 566 |  | $ 566 |
Pre-ASC 326 |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance |  |  | 53,748 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance |  |  | 53,748 |  |  | 53,748
Pre-ASC 326 | Commercial Loans |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance |  |  | 18,291 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance |  |  | 18,291 |  |  | 18,291
Pre-ASC 326 | Commercial Real Estate Loans |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance |  |  | 21,190 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance |  |  | 21,190 |  |  | 21,190
Pre-ASC 326 | Real Estate Construction |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance |  |  | 3,204 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance |  |  | 3,204 |  |  | 3,204
Pre-ASC 326 | Retail Real Estate |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance |  |  | 10,495 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance |  |  | 10,495 |  |  | 10,495
Pre-ASC 326 | Retail Other |  |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |  |
Beginning balance |  |  | 568 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Ending balance |  |  | $ 568 |  |  | $ 568

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