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Portfolio loans - Distribution of portfolio loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Distributions of portfolio loans |  |  |  |  |  |  |  |
Portfolio loans | $ 7,121,311 |  |  | $ 7,121,311 | $ 6,687,249 |  |  |
Allowance for loan losses | (98,841) | $ (96,046) |  | (98,841) | (53,748) | $ (52,965) | $ (51,375) | $ (50,648)
Portfolio loans, net | 7,022,470 |  |  | 7,022,470 | 6,633,501 |  |  |
Net deferred loan origination costs | 6,000 |  |  | 6,000 | 6,200 |  |  |
Net accretable purchase accounting adjustments |  |  |  | 13,200 | 20,200 |  |  |
Commercial Loans |  |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |  |
Portfolio loans | 2,281,031 |  |  | 2,281,031 | 1,748,368 |  |  |
Allowance for loan losses | (24,363) | (24,146) |  | (24,363) | (18,291) | (16,526) | (16,733) | (17,829)
Commercial Real Estate Loans |  |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |  |
Portfolio loans | 2,912,408 |  |  | 2,912,408 | 2,793,417 |  |  |
Allowance for loan losses | (45,917) | (42,680) |  | (45,917) | (21,190) | (22,220) | (20,188) | (21,137)
Real Estate Construction |  |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |  |
Portfolio loans | 407,266 |  |  | 407,266 | 401,861 |  |  |
Allowance for loan losses | (7,419) | (7,792) |  | (7,419) | (3,204) | (3,110) | (3,305) | (2,723)
Retail Real Estate |  |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |  |
Portfolio loans | 1,480,520 |  |  | 1,480,520 | 1,693,769 |  |  |
Allowance for loan losses | (20,184) | (20,405) |  | (20,184) | (10,495) | (10,522) | (10,613) | (8,471)
Loans purchased | 0 | 0 | $ 43,900 |  |  |  |  |
Retail Other |  |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |  |
Portfolio loans | 40,086 |  |  | 40,086 | 49,834 |  |  |
Allowance for loan losses | (958) | $ (1,023) |  | (958) | $ (568) | $ (587) | $ (536) | $ (488)
Paycheck Protection Program |  |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |  |
Amortized cost of the loans outstanding | $ 736,400 |  |  | $ 736,400 |  |  |  |

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