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Portfolio loans and allowance for loan losses - Distribution of portfolio loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Distributions of portfolio loans |  |  |  |
Portfolio loans | $ 6,745,499 | $ 6,687,249 |  |
Allowance for loan losses | (84,384) | (53,748) | $ (50,915) | $ (50,648)
Portfolio loans, net | 6,661,115 | 6,633,501 |  |
Net deferred loan origination costs | 6,400 | 6,200 |  |
Net accretable purchase accounting adjustments | 17,700 | 20,200 |  |
Commercial Loans |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 1,767,191 | 1,748,368 |  |
Allowance for loan losses | (22,725) | (18,291) | (17,998) | (17,829)
Commercial Real Estate Loans |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 2,825,003 | 2,793,417 |  |
Allowance for loan losses | (35,967) | (21,190) | (20,097) | (21,137)
Real Estate Construction |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 448,313 | 401,861 |  |
Allowance for loan losses | (7,193) | (3,204) | (2,807) | (2,723)
Retail Real Estate |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 1,656,628 | 1,693,769 |  |
Allowance for loan losses | (17,454) | (10,495) | (9,503) | (8,471)
Loans purchased | 43,900 |  |  |
Retail Other |  |  |  |
Distributions of portfolio loans |  |  |  |
Portfolio loans | 48,364 | 49,834 |  |
Allowance for loan losses | $ (1,045) | $ (568) | $ (510) | $ (488)

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