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Portfolio loans and allowance for loan losses - Distribution of portfolio loans (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Distributions of portfolio loans |  |  |  |
Portfolio loans | $ 6,687,249 | $ 5,568,428 |  |
Allowance for loan losses | (53,748) | (50,648) | $ (53,582) | $ (47,795)
Portfolio loans, net | 6,633,501 | 5,517,780 |  |
Net deferred loan origination costs | 6,200 | 5,600 |  |
Net accretable purchase accounting adjustments | (20,200) | (13,900) |  |
Commercial Loans |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 1,748,368 | 1,405,106 |  |
Allowance for loan losses | (18,291) | (17,829) | (14,779) | (13,303)
Commercial Real Estate Loans |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 2,793,417 | 2,366,823 |  |
Allowance for loan losses | (21,190) | (21,137) | (21,813) | (20,623)
Real Estate Construction |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 401,861 | 288,197 |  |
Allowance for loan losses | (3,204) | (2,723) | (2,861) | (1,870)
Retail Real Estate |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 1,693,769 | 1,480,133 |  |
Allowance for loan losses | (10,495) | (8,471) | (13,783) | (11,648)
Retail Other |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 49,834 | 28,169 |  |
Allowance for loan losses | $ (568) | $ (488) | $ (346) | $ (351)

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