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Fair value of financial instruments - Schedule of Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | $ 610,695 | $ 262,518
Past due loans of 90 days or more | 0 | 0
Nonaccrual loans | 12,812 | 0
Fair Value | Construction |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 228,444 |
Aggregate Unpaid Principal Balance |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 587,352 | 254,868
Past due loans of 90 days or more | 0 | 0
Nonaccrual loans | 12,812 | 0
Aggregate Unpaid Principal Balance | Construction |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 250,649 |
Difference |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 23,343 | 7,650
Past due loans of 90 days or more | 0 | 0
Nonaccrual loans | 0 | $ 0
Difference | Construction |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | $ (22,205) |

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