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Loans and allowance for credit losses - Past Due Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | $ 7,213,538 | $ 7,213,538 | $ 4,409,642 | $ 4,409,642
Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 25,282
Non-accrual with no related allowance |  | 13,172 |  |
Non-accrual with related allowance |  | 21,413 |  |
Related allowance |  | 3,016 |  |
Interest income on non-accrual loans | 524 | 729 |  |
Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 34,585 | 34,585 |  | 21,062
30-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 15,151 | 15,151 |  | 18,477
90 Days or More and Accruing Interest |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 9,064 | 9,064 |  | 5,543
Financing Receivables Current |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 7,154,738 | 7,154,738 |  | 4,307,408
Commercial and industrial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,417,671 | 1,417,671 |  | 1,034,036
Commercial and industrial | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 5,586
Non-accrual with no related allowance |  | 913 |  |
Non-accrual with related allowance |  | 5,666 |  |
Related allowance |  | 936 |  |
Interest income on non-accrual loans | 287 | 304 |  |
Commercial and industrial | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 6,579 | 6,579 |  | 5,587
Commercial and industrial | 30-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,581 | 1,581 |  | 1,918
Commercial and industrial | 90 Days or More and Accruing Interest |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 11 | 11 |  | 291
Commercial and industrial | Financing Receivables Current |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,409,500 | 1,409,500 |  | 1,024,556
Construction |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,190,878 | 1,190,878 |  | 551,101
Construction | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 1,254
Non-accrual with no related allowance |  | 980 |  |
Non-accrual with related allowance |  | 1,038 |  |
Related allowance |  | 145 |  |
Interest income on non-accrual loans | 42 | 48 |  |
Construction | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 2,018 | 2,018 |  | 1,087
Construction | 30-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 4,346 | 4,346 |  | 1,021
Construction | 90 Days or More and Accruing Interest |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 196 | 196 |  | 42
Construction | Financing Receivables Current |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,184,318 | 1,184,318 |  | 546,067
Residential real estate: | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,140,611 | 1,140,611 |  | 710,454
Residential real estate: | 1-to-4 family mortgage | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 4,585
Non-accrual with no related allowance |  | 4,247 |  |
Non-accrual with related allowance |  | 2,505 |  |
Related allowance |  | 62 |  |
Interest income on non-accrual loans | 15 | 21 |  |
Residential real estate: | 1-to-4 family mortgage | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 6,752 | 6,752 |  | 3,332
Residential real estate: | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 420,318 | 420,318 |  | 221,530
Residential real estate: | Residential line of credit | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 489
Non-accrual with no related allowance |  | 0 |  |
Non-accrual with related allowance |  | 1,925 |  |
Related allowance |  | 74 |  |
Interest income on non-accrual loans | 72 | 72 |  |
Residential real estate: | Residential line of credit | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,925 | 1,925 |  | 416
Residential real estate: | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 165,937 | 165,937 |  | 69,429
Residential real estate: | Multi-family mortgage | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  | 0
Residential real estate: | 30-89 Days Past Due | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 4,143 | 4,143 |  | 10,738
Residential real estate: | 30-89 Days Past Due | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 287 | 287 |  | 658
Residential real estate: | 30-89 Days Past Due | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  | 63
Residential real estate: | 90 Days or More and Accruing Interest | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 7,452 | 7,452 |  | 3,965
Residential real estate: | 90 Days or More and Accruing Interest | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 216 | 216 |  | 412
Residential real estate: | 90 Days or More and Accruing Interest | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 57 | 57 |  | 0
Residential real estate: | Financing Receivables Current | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,122,264 | 1,122,264 |  | 673,081
Residential real estate: | Financing Receivables Current | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 417,890 | 417,890 |  | 219,971
Residential real estate: | Financing Receivables Current | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 165,880 | 165,880 |  | 69,366
Commercial real estate: | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 924,987 | 924,987 |  | 630,270
Commercial real estate: | Owner occupied | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 2,285
Non-accrual with no related allowance |  | 1,469 |  |
Non-accrual with related allowance |  | 725 |  |
Related allowance |  | 66 |  |
Interest income on non-accrual loans | 32 | 75 |  |
Commercial real estate: | Owner occupied | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 2,194 | 2,194 |  | 1,793
Commercial real estate: | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,644,400 | 1,644,400 |  | 920,744
Commercial real estate: | Non-owner occupied | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 9,460
Non-accrual with no related allowance |  | 5,475 |  |
Non-accrual with related allowance |  | 6,883 |  |
Related allowance |  | 1,568 |  |
Interest income on non-accrual loans | 76 | 185 |  |
Commercial real estate: | Non-owner occupied | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 12,358 | 12,358 |  | 7,880
Commercial real estate: | 30-89 Days Past Due | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,096 | 1,096 |  | 1,375
Commercial real estate: | 30-89 Days Past Due | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 114 | 114 |  | 327
Commercial real estate: | 90 Days or More and Accruing Interest | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  | 0
Commercial real estate: | 90 Days or More and Accruing Interest | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 0 | 0 |  | 0
Commercial real estate: | Financing Receivables Current | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 921,697 | 921,697 |  | 621,211
Commercial real estate: | Financing Receivables Current | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,631,928 | 1,631,928 |  | 902,340
Consumer and other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 308,736 | 308,736 |  | 272,078
Consumer and other | Collectively Evaluated |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Non-accrual amortized cost |  |  |  | 1,623
Non-accrual with no related allowance |  | 88 |  |
Non-accrual with related allowance |  | 2,671 |  |
Related allowance |  | 165 |  |
Interest income on non-accrual loans | 0 | 24 |  |
Consumer and other | Non Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 2,759 | 2,759 |  | 967
Consumer and other | 30-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 3,584 | 3,584 |  | 2,377
Consumer and other | 90 Days or More and Accruing Interest |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | 1,132 | 1,132 |  | 833
Consumer and other | Financing Receivables Current |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans | $ 301,261 | $ 301,261 |  | 250,816
Purchased Credit Impaired |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 57,152
Purchased Credit Impaired | Commercial and industrial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 1,684
Purchased Credit Impaired | Construction |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 2,884
Purchased Credit Impaired | Residential real estate: | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 19,338
Purchased Credit Impaired | Residential real estate: | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 73
Purchased Credit Impaired | Residential real estate: | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 0
Purchased Credit Impaired | Commercial real estate: | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 5,891
Purchased Credit Impaired | Commercial real estate: | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | 10,197
Purchased Credit Impaired | Consumer and other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans |  |  |  | $ 17,085

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