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Portfolio loans and allowance for credit losses - Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | $ 53,748 | $ 50,648 | $ 53,582 |  |
Provision for loan losses | 38,797 | 10,406 | 4,429 |  |
Charged-off | (11,088) | (11,760) | (10,944) |  |
Recoveries | 2,758 | 4,454 | 3,581 |  |
Ending balance | 101,048 | 53,748 | 50,648 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | $ 1,625 | $ 4,853
Loans collectively evaluated for impairment |  |  |  | 99,423 | 48,895
Ending balance | 53,748 | 50,648 | 53,582 | 101,048 | 53,748
Loans: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 17,974 | 34,031
Loans collectively evaluated for impairment |  |  |  | 6,793,931 | 6,650,170
PCI loans evaluated for impairment |  |  |  | 2,272 | 3,048
Ending balance |  |  |  | 6,814,177 | 6,687,249
Commercial Loans |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 18,291 | 17,829 | 14,779 |  |
Provision for loan losses | 10,832 | 4,893 | 5,767 |  |
Charged-off | (6,376) | (6,478) | (3,968) |  |
Recoveries | 404 | 2,047 | 1,251 |  |
Ending balance | 23,866 | 18,291 | 17,829 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 1,600 | 3,330
Loans collectively evaluated for impairment |  |  |  | 22,266 | 14,961
Ending balance | 23,866 | 17,829 | 17,829 | 23,866 | 18,291
Loans: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 8,372 | 9,740
Loans collectively evaluated for impairment |  |  |  | 2,006,204 | 1,738,615
PCI loans evaluated for impairment |  |  |  |  | 13
Ending balance |  |  |  | 2,014,576 | 1,748,368
Commercial Real Estate Loans |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 21,190 | 21,137 | 21,813 |  |
Provision for loan losses | 17,511 | 3,002 | 3,227 |  |
Charged-off | (1,972) | (3,257) | (4,352) |  |
Recoveries | 195 | 308 | 449 |  |
Ending balance | 46,230 | 21,190 | 21,137 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 1,049
Loans collectively evaluated for impairment |  |  |  | 46,230 | 20,141
Ending balance | 21,190 | 21,137 | 21,137 | 46,230 | 21,190
Loans: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 4,161 | 10,018
Loans collectively evaluated for impairment |  |  |  | 2,886,468 | 2,781,495
PCI loans evaluated for impairment |  |  |  | 1,906 | 1,904
Ending balance |  |  |  | 2,892,535 | 2,793,417
Real Estate Construction |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 3,204 | 2,723 | 2,861 |  |
Provision for loan losses | 1,452 | (70) | (259) |  |
Charged-off | (18) |  | (97) |  |
Recoveries | 601 | 551 | 218 |  |
Ending balance | 8,193 | 3,204 | 2,723 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Loans collectively evaluated for impairment |  |  |  | 8,193 | 3,204
Ending balance | 3,204 | 3,204 | 2,861 | 8,193 | 3,204
Loans: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 292 | 539
Loans collectively evaluated for impairment |  |  |  | 461,494 | 400,887
PCI loans evaluated for impairment |  |  |  |  | 435
Ending balance |  |  |  | 461,786 | 401,861
Retail Real Estate |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 10,495 | 8,471 | 13,783 |  |
Provision for loan losses | 9,050 | 2,102 | (4,824) |  |
Charged-off | (2,057) | (1,162) | (1,815) |  |
Recoveries | 1,212 | 1,084 | 1,327 |  |
Ending balance | 21,992 | 10,495 | 8,471 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 25 | 474
Loans collectively evaluated for impairment |  |  |  | 21,967 | 10,021
Ending balance | 10,495 | 10,495 | 13,783 | 21,992 | 10,495
Loans: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  | 5,149 | 13,676
Loans collectively evaluated for impairment |  |  |  | 1,402,337 | 1,679,397
PCI loans evaluated for impairment |  |  |  | 366 | 696
Ending balance |  |  |  | 1,407,852 | 1,693,769
Retail Other |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 568 | 488 | 346 |  |
Provision for loan losses | (48) | 479 | 518 |  |
Charged-off | (665) | (863) | (712) |  |
Recoveries | 346 | 464 | 336 |  |
Ending balance | 767 | 568 | 488 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Loans collectively evaluated for impairment |  |  |  | 767 | 568
Ending balance | 568 | 568 | $ 346 | 767 | 568
Loans: |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 58
Loans collectively evaluated for impairment |  |  |  | 37,428 | 49,776
Ending balance |  |  |  | $ 37,428 | 49,834
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 16,833 |  |  |  |
Ending balance |  | 16,833 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Ending balance | 16,833 | 16,833 |  |  | 16,833
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 715 |  |  |  |
Ending balance |  | 715 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Ending balance | 715 | 715 |  |  | 715
Cumulative Effect, Period of Adoption, Adjustment | Commercial Real Estate Loans |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 9,306 |  |  |  |
Ending balance |  | 9,306 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Ending balance | 9,306 | 9,306 |  |  | 9,306
Cumulative Effect, Period of Adoption, Adjustment | Real Estate Construction |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 2,954 |  |  |  |
Ending balance |  | 2,954 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Ending balance | 2,954 | 2,954 |  |  | 2,954
Cumulative Effect, Period of Adoption, Adjustment | Retail Real Estate |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 3,292 |  |  |  |
Ending balance |  | 3,292 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Ending balance | 3,292 | 3,292 |  |  | 3,292
Cumulative Effect, Period of Adoption, Adjustment | Retail Other |  |  |  |  |
Activity in the allowance for loan losses |  |  |  |  |
Beginning balance | 566 |  |  |  |
Ending balance |  | 566 |  |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |
Ending balance | $ 566 | $ 566 |  |  | $ 566

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