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Loans and allowance for credit losses - Changes in Allowance for Credit Losses by Class of Financing Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 144,663 $ 113,129 $ 170,389 $ 31,139
Provision for credit losses (2,832) 45,834 (27,349) 97,837
Recoveries of loans previously charged-off 229 1,172 1,049 2,620
Loans charged off (2,614) (993) (4,643) (4,569)
Initial allowance on loans purchased with deteriorated credit quality   24,831   25,500
Balance at end of period 139,446 183,973 139,446 183,973
Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     18,945  
Balance at end of period 14,228   14,228  
Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       30,888
Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       558
Commercial and industrial        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 13,791 8,878 14,748 4,805
Provision for credit losses 3,203 (1,520) 2,667 (2,354)
Recoveries of loans previously charged-off 19 757 235 1,652
Loans charged off (2,175) (249) (2,812) (1,630)
Initial allowance on loans purchased with deteriorated credit quality   743   754
Balance at end of period 14,838 8,609 14,838 8,609
Commercial and industrial | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     882  
Balance at end of period 567   567  
Commercial and industrial | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       5,300
Commercial and industrial | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       82
Construction        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 32,838 35,599 58,477 10,194
Provision for credit losses (3,080) 22,383 (28,690) 45,962
Recoveries of loans previously charged-off 3 51 3 202
Loans charged off (1) 0 (30) (18)
Initial allowance on loans purchased with deteriorated credit quality   5,596   5,606
Balance at end of period 29,760 63,629 29,760 63,629
Construction | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     4,317  
Balance at end of period 1,404   1,404  
Construction | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       1,533
Construction | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       150
Residential real estate | 1-to-4 family mortgage        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 19,672 12,463 19,220 3,112
Provision for credit losses (2,677) 4,194 (2,141) 5,412
Recoveries of loans previously charged-off 33 116 98 166
Loans charged off 0 (8) (149) (373)
Initial allowance on loans purchased with deteriorated credit quality   1,533   1,640
Balance at end of period 17,028 18,298 17,028 18,298
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     2,014  
Balance at end of period 972   972  
Residential real estate | 1-to-4 family mortgage | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       7,920
Residential real estate | 1-to-4 family mortgage | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       421
Residential real estate | Residential line of credit        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 6,716 6,811 10,534 752
Provision for credit losses (952) 4,053 (4,767) 6,633
Recoveries of loans previously charged-off 1 22 16 61
Loans charged off 0 0 (18) (21)
Initial allowance on loans purchased with deteriorated credit quality   569   572
Balance at end of period 5,765 11,455 5,765 11,455
Residential real estate | Residential line of credit | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     494  
Balance at end of period 161   161  
Residential real estate | Residential line of credit | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       3,461
Residential real estate | Residential line of credit | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       (3)
Residential real estate | Multi-family mortgage        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 13,475 4,499 7,174 544
Provision for credit losses (1,462) 1,908 4,839 5,523
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 12,013 7,191 12,013 7,191
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     848  
Balance at end of period 452   452  
Residential real estate | Multi-family mortgage | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       340
Residential real estate | Multi-family mortgage | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       0
Commercial real estate | Owner occupied        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 4,707 7,420 4,849 4,109
Provision for credit losses 7,665 (1,276) 7,384 132
Recoveries of loans previously charged-off 4 51 143 68
Loans charged off 0 (95) 0 (304)
Initial allowance on loans purchased with deteriorated credit quality   605   659
Balance at end of period 12,376 6,705 12,376 6,705
Commercial real estate | Owner occupied | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     757  
Balance at end of period 965   965  
Commercial real estate | Owner occupied | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       1,879
Commercial real estate | Owner occupied | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       162
Commercial real estate | Non-owner occupied        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 42,856 30,444 44,147 4,621
Provision for credit losses (6,450) 12,364 (7,741) 31,282
Recoveries of loans previously charged-off 0 0 0 0
Loans charged off 0 (166) 0 (711)
Initial allowance on loans purchased with deteriorated credit quality   14,998   15,442
Balance at end of period 36,406 57,640 36,406 57,640
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     8,910  
Balance at end of period 9,106   9,106  
Commercial real estate | Non-owner occupied | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       6,822
Commercial real estate | Non-owner occupied | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       184
Consumer and other        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 10,608 7,015 11,240 3,002
Provision for credit losses 921 3,728 1,100 5,247
Recoveries of loans previously charged-off 169 175 554 471
Loans charged off (438) (475) (1,634) (1,512)
Initial allowance on loans purchased with deteriorated credit quality   3   43
Balance at end of period 11,260 $ 10,446 11,260 10,446
Consumer and other | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period     723  
Balance at end of period $ 601   $ 601  
Consumer and other | Impact of adopting ASC 326 | Non-purchased credit deteriorated loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       3,633
Consumer and other | Impact of adopting ASC 326 | Purchased Credit Impaired loans        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period       $ (438)