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Loans and allowance for credit losses - Loans Outstanding by Major Lending Classification (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | $ 7,213,538 |  | $ 4,409,642 | $ 4,409,642 |  |  |
Less: Allowance for credit losses | (183,973) | $ (113,129) | $ (31,139) | (31,139) | $ (31,464) | $ (30,138) | $ (28,932)
Net loans | 7,029,565 |  |  | 4,378,503 |  |  |
Loans processed | 310,719 |  |  |  |  |  |
Paycheck Protection Program |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Less: Allowance for credit losses | (49) |  |  |  |  |  |
Commercial and industrial |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 1,417,671 |  |  | 1,034,036 |  |  |
Less: Allowance for credit losses | (8,609) | (8,878) |  | (4,805) | (5,170) | (4,923) | (5,348)
Construction |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 1,190,878 |  |  | 551,101 |  |  |
Less: Allowance for credit losses | (63,629) | (35,599) |  | (10,194) | (9,842) | (9,655) | (9,729)
Residential real estate: | 1-to-4 family mortgage |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 1,140,611 |  |  | 710,454 |  |  |
Less: Allowance for credit losses | (18,298) | (12,463) |  | (3,112) | (3,331) | (3,288) | (3,428)
Residential real estate: | Residential line of credit |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 420,318 |  |  | 221,530 |  |  |
Less: Allowance for credit losses | (11,455) | (6,811) |  | (752) | (727) | (755) | (811)
Residential real estate: | Multi-family mortgage |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 165,937 |  |  | 69,429 |  |  |
Less: Allowance for credit losses | (7,191) | (4,499) |  | (544) | (574) | (617) | (566)
Commercial real estate: | Owner occupied |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 924,987 |  |  | 630,270 |  |  |
Less: Allowance for credit losses | (6,705) | (7,420) |  | (4,109) | (3,709) | (3,512) | (3,132)
Commercial real estate: | Non-owner occupied |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 1,644,400 |  |  | 920,744 |  |  |
Less: Allowance for credit losses | (57,640) | (30,444) |  | (4,621) | (4,927) | (4,478) | (4,149)
Consumer and other |  |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |  |
Gross loans | 308,736 |  |  | 272,078 |  |  |
Less: Allowance for credit losses | $ (10,446) | $ (7,015) |  | $ (3,002) | $ (3,184) | $ (2,910) | $ (1,769)

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