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Loans and allowance for credit losses - Credit Quality Indicators by Portfolio Class (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | $ 4,352,490
Purchased credit impaired loans |  |  | 57,152
Loans | $ 7,213,538 | $ 4,409,642 | 4,409,642
Pass |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 4,143,116
Purchased credit impaired loans |  |  | 0
Loans |  |  | 4,143,116
Watch |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 142,511
Purchased credit impaired loans |  |  | 43,669
Loans |  |  | 186,180
Substandard |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 66,863
Purchased credit impaired loans |  |  | 13,483
Loans |  |  | 80,346
Commercial and industrial |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 1,032,352
Purchased credit impaired loans |  |  | 1,684
Loans | 1,417,671 |  | 1,034,036
Commercial and industrial | Pass |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 946,247
Purchased credit impaired loans |  |  | 0
Commercial and industrial | Watch |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 66,910
Purchased credit impaired loans |  |  | 1,224
Commercial and industrial | Substandard |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 19,195
Purchased credit impaired loans |  |  | 460
Construction |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 548,217
Purchased credit impaired loans |  |  | 2,884
Loans | 1,190,878 |  | 551,101
Construction | Pass |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 541,201
Purchased credit impaired loans |  |  | 0
Construction | Watch |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 4,790
Purchased credit impaired loans |  |  | 2,681
Construction | Substandard |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 2,226
Purchased credit impaired loans |  |  | 203
Residential real estate: | 1-to-4 family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 691,116
Purchased credit impaired loans |  |  | 19,338
Loans | 1,140,611 |  | 710,454
Residential real estate: | Residential line of credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 221,457
Purchased credit impaired loans |  |  | 73
Loans | 420,318 |  | 221,530
Residential real estate: | Multi-family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 69,429
Purchased credit impaired loans |  |  | 0
Loans | 165,937 |  | 69,429
Residential real estate: | Pass | 1-to-4 family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 666,177
Purchased credit impaired loans |  |  | 0
Residential real estate: | Pass | Residential line of credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 218,086
Purchased credit impaired loans |  |  | 0
Residential real estate: | Pass | Multi-family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 69,366
Purchased credit impaired loans |  |  | 0
Residential real estate: | Watch | 1-to-4 family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 11,380
Purchased credit impaired loans |  |  | 15,091
Residential real estate: | Watch | Residential line of credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 1,343
Purchased credit impaired loans |  |  | 0
Residential real estate: | Watch | Multi-family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 63
Purchased credit impaired loans |  |  | 0
Residential real estate: | Substandard | 1-to-4 family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 13,559
Purchased credit impaired loans |  |  | 4,247
Residential real estate: | Substandard | Residential line of credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 2,028
Purchased credit impaired loans |  |  | 73
Residential real estate: | Substandard | Multi-family mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 0
Purchased credit impaired loans |  |  | 0
Commercial real estate: | Owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 624,379
Purchased credit impaired loans |  |  | 5,891
Loans | 924,987 |  | 630,270
Commercial real estate: | Non-owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 910,547
Purchased credit impaired loans |  |  | 10,197
Loans | 1,644,400 |  | 920,744
Commercial real estate: | Pass | Owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 576,737
Purchased credit impaired loans |  |  | 0
Commercial real estate: | Pass | Non-owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 876,670
Purchased credit impaired loans |  |  | 0
Commercial real estate: | Watch | Owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 30,379
Purchased credit impaired loans |  |  | 4,535
Commercial real estate: | Watch | Non-owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 24,342
Purchased credit impaired loans |  |  | 6,617
Commercial real estate: | Substandard | Owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 17,263
Purchased credit impaired loans |  |  | 1,356
Commercial real estate: | Substandard | Non-owner occupied |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 9,535
Purchased credit impaired loans |  |  | 3,580
Consumer and other |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 254,993
Purchased credit impaired loans |  |  | 17,085
Loans | $ 308,736 |  | 272,078
Consumer and other | Pass |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 248,632
Purchased credit impaired loans |  |  | 0
Consumer and other | Watch |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 3,304
Purchased credit impaired loans |  |  | 13,521
Consumer and other | Substandard |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans, excluding purchased credit impaired loans |  |  | 3,057
Purchased credit impaired loans |  |  | $ 3,564

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