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Loans and allowance for credit losses - Amount of Loans by Loan Category Broken Out Between Loans Individually Evaluated for Impairment and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | $ 23,810
Collectively evaluated for impairment |  |  | 4,328,680
Fair value |  |  | 57,152
Loans | $ 7,213,538 | $ 4,409,642 | 4,409,642
Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 9,026
Collectively evaluated for impairment |  |  | 1,023,326
Fair value |  |  | 1,684
Loans | 1,417,671 |  | 1,034,036
Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 2,061
Collectively evaluated for impairment |  |  | 546,156
Fair value |  |  | 2,884
Loans | 1,190,878 |  | 551,101
Residential real estate: | 1-to-4 family mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 1,347
Collectively evaluated for impairment |  |  | 689,769
Fair value |  |  | 19,338
Loans | 1,140,611 |  | 710,454
Residential real estate: | Residential line of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 579
Collectively evaluated for impairment |  |  | 220,878
Fair value |  |  | 73
Loans | 420,318 |  | 221,530
Residential real estate: | Multi-family mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 0
Collectively evaluated for impairment |  |  | 69,429
Fair value |  |  | 0
Loans | 165,937 |  | 69,429
Commercial real estate: | Owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 2,993
Collectively evaluated for impairment |  |  | 621,386
Fair value |  |  | 5,891
Loans | 924,987 |  | 630,270
Commercial real estate: | Non-owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 7,755
Collectively evaluated for impairment |  |  | 902,792
Fair value |  |  | 10,197
Loans | 1,644,400 |  | 920,744
Consumer and other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment |  |  | 49
Collectively evaluated for impairment |  |  | 254,944
Fair value |  |  | 17,085
Loans | $ 308,736 |  | $ 272,078

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