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Loans and allowance for credit losses - Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | $ 113,129 | $ 30,138 | $ 31,139 | $ 28,932
Provision for credit losses | 45,834 | 1,831 | 97,837 | 4,103
Recoveries of loans previously charged-off | 1,172 | 212 | 2,620 | 787
Loans charged off | (993) | (717) | (4,569) | (2,358)
Initial allowance on loans purchased with deteriorated credit quality | 24,831 |  | 25,500 |
Balance at end of period | 183,973 | 31,464 | 183,973 | 31,464
Commercial and industrial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 8,878 | 4,923 | 4,805 | 5,348
Provision for credit losses | (1,520) | 234 | (2,354) | 17
Recoveries of loans previously charged-off | 757 | 16 | 1,652 | 66
Loans charged off | (249) | (3) | (1,630) | (261)
Initial allowance on loans purchased with deteriorated credit quality | 743 |  | 754 |
Balance at end of period | 8,609 | 5,170 | 8,609 | 5,170
Construction |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 35,599 | 9,655 | 10,194 | 9,729
Provision for credit losses | 22,383 | 186 | 45,962 | 105
Recoveries of loans previously charged-off | 51 | 1 | 202 | 8
Loans charged off | 0 | 0 | (18) | 0
Initial allowance on loans purchased with deteriorated credit quality | 5,596 |  | 5,606 |
Balance at end of period | 63,629 | 9,842 | 63,629 | 9,842
Residential real estate: | 1-to-4 family mortgage |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 12,463 | 3,288 | 3,112 | 3,428
Provision for credit losses | 4,194 | 18 | 5,412 | (77)
Recoveries of loans previously charged-off | 116 | 25 | 166 | 62
Loans charged off | (8) | 0 | (373) | (82)
Initial allowance on loans purchased with deteriorated credit quality | 1,533 |  | 1,640 |
Balance at end of period | 18,298 | 3,331 | 18,298 | 3,331
Residential real estate: | Residential line of credit |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 6,811 | 755 | 752 | 811
Provision for credit losses | 4,053 | 67 | 6,633 | 100
Recoveries of loans previously charged-off | 22 | 75 | 61 | 121
Loans charged off | 0 | (170) | (21) | (305)
Initial allowance on loans purchased with deteriorated credit quality | 569 |  | 572 |
Balance at end of period | 11,455 | 727 | 11,455 | 727
Residential real estate: | Multi-family mortgage |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 4,499 | 617 | 544 | 566
Provision for credit losses | 1,908 | (43) | 5,523 | 8
Recoveries of loans previously charged-off | 0 | 0 | 0 | 0
Loans charged off | 0 | 0 | 0 | 0
Initial allowance on loans purchased with deteriorated credit quality | 784 |  | 784 |
Balance at end of period | 7,191 | 574 | 7,191 | 574
Commercial real estate: | Owner occupied |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 7,420 | 3,512 | 4,109 | 3,132
Provision for credit losses | (1,276) | 194 | 132 | 482
Recoveries of loans previously charged-off | 51 | 3 | 68 | 95
Loans charged off | (95) | 0 | (304) | 0
Initial allowance on loans purchased with deteriorated credit quality | 605 |  | 659 |
Balance at end of period | 6,705 | 3,709 | 6,705 | 3,709
Commercial real estate: | Non-owner occupied |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 30,444 | 4,478 | 4,621 | 4,149
Provision for credit losses | 12,364 | 461 | 31,282 | 790
Recoveries of loans previously charged-off | 0 | 0 | 0 | 0
Loans charged off | (166) | (12) | (711) | (12)
Initial allowance on loans purchased with deteriorated credit quality | 14,998 |  | 15,442 |
Balance at end of period | 57,640 | 4,927 | 57,640 | 4,927
Consumer and other |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 7,015 | 2,910 | 3,002 | 1,769
Provision for credit losses | 3,728 | 714 | 5,247 | 2,678
Recoveries of loans previously charged-off | 175 | 92 | 471 | 435
Loans charged off | (475) | (532) | (1,512) | (1,698)
Initial allowance on loans purchased with deteriorated credit quality | 3 |  | 43 |
Balance at end of period | $ 10,446 | $ 3,184 | 10,446 | $ 3,184
Non-purchased credit deteriorated loan | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 30,888 |
Non-purchased credit deteriorated loan | Commercial and industrial | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 5,300 |
Non-purchased credit deteriorated loan | Construction | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 1,533 |
Non-purchased credit deteriorated loan | Residential real estate: | 1-to-4 family mortgage | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 7,920 |
Non-purchased credit deteriorated loan | Residential real estate: | Residential line of credit | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 3,461 |
Non-purchased credit deteriorated loan | Residential real estate: | Multi-family mortgage | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 340 |
Non-purchased credit deteriorated loan | Commercial real estate: | Owner occupied | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 1,879 |
Non-purchased credit deteriorated loan | Commercial real estate: | Non-owner occupied | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 6,822 |
Non-purchased credit deteriorated loan | Consumer and other | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 3,633 |
Purchased credit deteriorated loan | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 558 |
Purchased credit deteriorated loan | Commercial and industrial | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 82 |
Purchased credit deteriorated loan | Construction | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 150 |
Purchased credit deteriorated loan | Residential real estate: | 1-to-4 family mortgage | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 421 |
Purchased credit deteriorated loan | Residential real estate: | Residential line of credit | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | (3) |
Purchased credit deteriorated loan | Residential real estate: | Multi-family mortgage | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 0 |
Purchased credit deteriorated loan | Commercial real estate: | Owner occupied | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 162 |
Purchased credit deteriorated loan | Commercial real estate: | Non-owner occupied | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 184 |
Purchased credit deteriorated loan | Consumer and other | Accounting Standards Update 2019-11 |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ (438) |

X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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