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Portfolio loans - Distribution of portfolio loans (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Distributions of portfolio loans |  |  |  |  |  |  |
Portfolio loans | $ 7,229,020,000 |  | $ 7,229,020,000 | $ 6,687,249,000 |  |  |
Allowance for loan losses | (96,046,000) | $ (84,384,000) | (96,046,000) | (53,748,000) | $ (51,375,000) | $ (50,915,000) | $ (50,648,000)
Portfolio loans, net | 7,132,974,000 |  | 7,132,974,000 | 6,633,501,000 |  |  |
Net deferred loan origination costs | 11,100,000 |  | 11,100,000 | 6,200,000 |  |  |
Net accretable purchase accounting adjustments |  |  | 15,500,000 | 20,200,000 |  |  |
Commercial Loans |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |
Portfolio loans | 2,357,954,000 |  | 2,357,954,000 | 1,748,368,000 |  |  |
Allowance for loan losses | (24,146,000) | (22,725,000) | (24,146,000) | (18,291,000) | (16,733,000) | (17,998,000) | (17,829,000)
Commercial Real Estate Loans |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |
Portfolio loans | 2,847,014,000 |  | 2,847,014,000 | 2,793,417,000 |  |  |
Allowance for loan losses | (42,680,000) | (35,967,000) | (42,680,000) | (21,190,000) | (20,188,000) | (20,097,000) | (21,137,000)
Real Estate Construction |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |
Portfolio loans | 433,031,000 |  | 433,031,000 | 401,861,000 |  |  |
Allowance for loan losses | (7,792,000) | (7,193,000) | (7,792,000) | (3,204,000) | (3,305,000) | (2,807,000) | (2,723,000)
Retail Real Estate |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |
Portfolio loans | 1,548,215,000 |  | 1,548,215,000 | 1,693,769,000 |  |  |
Allowance for loan losses | (20,405,000) | (17,454,000) | (20,405,000) | (10,495,000) | (10,613,000) | (9,503,000) | (8,471,000)
Loans purchased | 0 | 43,900,000 |  |  |  |  |
Retail Other |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |
Portfolio loans | 42,806,000 |  | 42,806,000 | 49,834,000 |  |  |
Allowance for loan losses | (1,023,000) | $ (1,045,000) | (1,023,000) | $ (568,000) | $ (536,000) | $ (510,000) | $ (488,000)
Paycheck Protection Program |  |  |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |  |  |
Amortized cost of the loans outstanding | $ 729,300,000 |  | $ 729,300,000 |  |  |  |

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