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Bank segment - Allowance for credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Allowance for credit losses:          
Beginning balance $ 78,252 $ 81,307 $ 101,201 $ 53,355  
Charge-offs (1,915) (5,608) (7,856) (19,619)  
Recoveries 1,582 1,290 4,566 3,078  
Provision for credit losses (1,975) 14,470 (21,967) 35,204  
Ending balance 75,944 91,459 75,944 91,459 $ 53,355
Accounting standards update, extensible enumeration         Accounting Standards Update 2016-13 [Member]
Real estate | Residential 1-4 family          
Allowance for credit losses:          
Beginning balance 5,518 3,911 4,600 2,380  
Charge-offs (47) 0 (67) (7)  
Recoveries 5 12 59 67  
Provision for credit losses 522 (286) 1,406 (953)  
Ending balance 5,998 3,637 5,998 3,637 $ 2,380
Real estate | Commercial real estate          
Allowance for credit losses:          
Beginning balance 28,708 21,100 35,607 15,053  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for credit losses (2,750) 11,049 (9,649) 16,888  
Ending balance 25,958 32,149 25,958 32,149 15,053
Real estate | Home equity line of credit          
Allowance for credit losses:          
Beginning balance 5,335 6,214 6,813 6,922  
Charge-offs (5) 0 (45) 0  
Recoveries 7 50 83 56  
Provision for credit losses 441 (390) (1,073) (563)  
Ending balance 5,778 5,874 5,778 5,874 6,922
Real estate | Residential land          
Allowance for credit losses:          
Beginning balance 618 356 609 449  
Charge-offs 0 0 0 (351)  
Recoveries 35 12 56 26  
Provision for credit losses (19) 178 (31) 486  
Ending balance 634 546 634 546 449
Real estate | Commercial construction          
Allowance for credit losses:          
Beginning balance 1,629 4,757 4,149 2,097  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for credit losses 104 1,282 (2,416) 3,653  
Ending balance 1,733 6,039 1,733 6,039 2,097
Real estate | Residential construction          
Allowance for credit losses:          
Beginning balance 16 14 11 3  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for credit losses (3) (3) 2 (6)  
Ending balance 13 11 13 11 3
Commercial          
Allowance for credit losses:          
Beginning balance 20,058 13,868 25,462 10,245  
Charge-offs (266) (1,727) (1,356) (2,795)  
Recoveries 417 211 1,056 503  
Provision for credit losses (758) 5,840 (5,711) 9,317  
Ending balance 19,451 18,192 19,451 18,192 10,245
Consumer          
Allowance for credit losses:          
Beginning balance 16,370 31,087 23,950 16,206  
Charge-offs (1,597) (3,881) (6,388) (16,466)  
Recoveries 1,118 1,005 3,312 2,426  
Provision for credit losses 488 (3,200) (4,495) 6,382  
Ending balance $ 16,379 $ 25,011 $ 16,379 25,011 16,206
Impact of adoption of ASU No. 2016-13          
Allowance for credit losses:          
Beginning balance       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  
Ending balance         2,150
Impact of adoption of ASU No. 2016-13 | Real estate | Commercial real estate          
Allowance for credit losses:          
Beginning balance       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)  
Ending balance         (541)
Impact of adoption of ASU No. 2016-13 | Real estate | Residential land          
Allowance for credit losses:          
Beginning balance       (64)  
Ending balance         (64)
Impact of adoption of ASU No. 2016-13 | Real estate | Commercial construction          
Allowance for credit losses:          
Beginning balance       289  
Ending balance         289
Impact of adoption of ASU No. 2016-13 | Real estate | Residential construction          
Allowance for credit losses:          
Beginning balance       14  
Ending balance         14
Impact of adoption of ASU No. 2016-13 | Commercial          
Allowance for credit losses:          
Beginning balance       922  
Ending balance         922
Impact of adoption of ASU No. 2016-13 | Consumer          
Allowance for credit losses:          
Beginning balance       $ 16,463  
Ending balance         $ 16,463