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Bank segment - Allowance for credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Allowance for credit losses:            
Beginning balance $ 91,793 $ 77,084 $ 101,201 $ 53,355 $ 53,355  
Charge-offs (2,260) (7,380) (5,941) (14,011)    
Recoveries 1,676 770 2,984 1,788    
Provision for credit losses (12,957) 10,833 (19,992) 20,734    
Ending balance 78,252 81,307 78,252 81,307 $ 101,201 $ 53,355
Accounting standards update, extensible enumeration         us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member
Real estate | Residential 1-4 family            
Allowance for credit losses:            
Beginning balance 5,261 4,476 4,600 2,380 $ 2,380  
Charge-offs (20) (7) (20) (7)    
Recoveries 51 2 54 55    
Provision for credit losses 226 (560) 884 (667)    
Ending balance 5,518 3,911 5,518 3,911 4,600 $ 2,380
Real estate | Commercial real estate            
Allowance for credit losses:            
Beginning balance 34,345 16,587 35,607 15,053 15,053  
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision for credit losses (5,637) 4,513 (6,899) 5,839    
Ending balance 28,708 21,100 28,708 21,100 35,607 15,053
Real estate | Home equity line of credit            
Allowance for credit losses:            
Beginning balance 5,901 6,225 6,813 6,922 6,922  
Charge-offs 10 0 (40) 0    
Recoveries 61 0 76 6    
Provision for credit losses (637) (11) (1,514) (173)    
Ending balance 5,335 6,214 5,335 6,214 6,813 6,922
Real estate | Residential land            
Allowance for credit losses:            
Beginning balance 573 352 609 449 449  
Charge-offs 0 (343) 0 (351)    
Recoveries 11 5 21 14    
Provision for credit losses 34 342 (12) 308    
Ending balance 618 356 618 356 609 449
Real estate | Commercial construction            
Allowance for credit losses:            
Beginning balance 1,453 3,446 4,149 2,097 2,097  
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision for credit losses 176 1,311 (2,520) 2,371    
Ending balance 1,629 4,757 1,629 4,757 4,149 2,097
Real estate | Residential construction            
Allowance for credit losses:            
Beginning balance 16 14 11 3 3  
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision for credit losses 0 0 5 (3)    
Ending balance 16 14 16 14 11 3
Commercial            
Allowance for credit losses:            
Beginning balance 24,504 12,977 25,462 10,245 10,245  
Charge-offs (319) (699) (1,090) (1,068)    
Recoveries 366 106 639 292    
Provision for credit losses (4,493) 1,484 (4,953) 3,477    
Ending balance 20,058 13,868 20,058 13,868 25,462 10,245
Consumer            
Allowance for credit losses:            
Beginning balance 19,740 33,007 23,950 16,206 16,206  
Charge-offs (1,931) (6,331) (4,791) (12,585)    
Recoveries 1,187 657 2,194 1,421    
Provision for credit losses (2,626) 3,754 (4,983) 9,582    
Ending balance $ 16,370 $ 31,087 $ 16,370 31,087 23,950 16,206
Impact of adoption of ASU No. 2016-13            
Allowance for credit losses:            
Beginning balance       19,441 19,441  
Ending balance           19,441
Impact of adoption of ASU No. 2016-13 | Real estate | Residential 1-4 family            
Allowance for credit losses:            
Beginning balance       2,150 2,150  
Ending balance           2,150
Impact of adoption of ASU No. 2016-13 | Real estate | Commercial real estate            
Allowance for credit losses:            
Beginning balance       208 208  
Ending balance           208
Impact of adoption of ASU No. 2016-13 | Real estate | Home equity line of credit            
Allowance for credit losses:            
Beginning balance       (541) (541)  
Ending balance           (541)
Impact of adoption of ASU No. 2016-13 | Real estate | Residential land            
Allowance for credit losses:            
Beginning balance       (64) (64)  
Ending balance           (64)
Impact of adoption of ASU No. 2016-13 | Real estate | Commercial construction            
Allowance for credit losses:            
Beginning balance       289 289  
Ending balance           289
Impact of adoption of ASU No. 2016-13 | Real estate | Residential construction            
Allowance for credit losses:            
Beginning balance       14 14  
Ending balance           14
Impact of adoption of ASU No. 2016-13 | Commercial            
Allowance for credit losses:            
Beginning balance       922 922  
Ending balance           922
Impact of adoption of ASU No. 2016-13 | Consumer            
Allowance for credit losses:            
Beginning balance       $ 16,463 $ 16,463  
Ending balance           $ 16,463