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Bank segment - Allowance for credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period $ 81,307 $ 58,425 $ 53,355 $ 52,119  
Charge-offs (5,608) (10,231) (19,619) (22,046)  
Recoveries 1,290 1,531 3,078 5,094  
Provision 14,470 3,315 35,204 17,873  
Valuation allowance, balance at the end of the period 91,459 53,040 91,459 53,040  
Ending balance: individually evaluated for impairment         $ 2,691
Ending balance: collectively evaluated for impairment         50,664
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 5,494,110   5,494,110   5,120,664
Ending balance: individually evaluated for impairment         40,737
Ending balance: collectively evaluated for impairment         5,079,927
Real estate          
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 4,261,537   4,261,537   4,192,069
Real estate | Residential 1-4 family          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 3,911 2,015 2,380 1,976  
Charge-offs 0 (7) (7) (26)  
Recoveries 12 27 67 644  
Provision (286) (56) (953) (615)  
Valuation allowance, balance at the end of the period 3,637 1,979 3,637 1,979  
Ending balance: individually evaluated for impairment         898
Ending balance: collectively evaluated for impairment         1,482
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 2,195,093   2,195,093   2,178,135
Ending balance: individually evaluated for impairment         15,600
Ending balance: collectively evaluated for impairment         2,162,535
Real estate | Commercial real estate          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 21,100 15,811 15,053 14,505  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 11,049 (396) 16,888 910  
Valuation allowance, balance at the end of the period 32,149 15,415 32,149 15,415  
Ending balance: individually evaluated for impairment         2
Ending balance: collectively evaluated for impairment         15,051
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 900,912   900,912   824,830
Ending balance: individually evaluated for impairment         1,048
Ending balance: collectively evaluated for impairment         823,782
Real estate | Home equity line of credit          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 6,214 6,881 6,922 6,371  
Charge-offs 0 (13) 0 (32)  
Recoveries 50 4 56 13  
Provision (390) 135 (563) 655  
Valuation allowance, balance at the end of the period 5,874 7,007 5,874 7,007  
Ending balance: individually evaluated for impairment         322
Ending balance: collectively evaluated for impairment         6,600
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 1,028,011   1,028,011   1,092,125
Ending balance: individually evaluated for impairment         12,073
Ending balance: collectively evaluated for impairment         1,080,052
Real estate | Residential land          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 356 537 449 479  
Charge-offs 0 0 (351) (4)  
Recoveries 12 28 26 42  
Provision 178 (104) 486 (56)  
Valuation allowance, balance at the end of the period 546 461 546 461  
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment         449
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 14,310   14,310   14,704
Ending balance: individually evaluated for impairment         3,091
Ending balance: collectively evaluated for impairment         11,613
Real estate | Commercial construction          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 4,757 2,046 2,097 2,790  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 1,282 196 3,653 (548)  
Valuation allowance, balance at the end of the period 6,039 2,242 6,039 2,242  
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment         2,097
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 112,930   112,930   70,605
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment         70,605
Real estate | Residential construction          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 14 2 3 4  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (3) 1 (6) (1)  
Valuation allowance, balance at the end of the period 11 3 11 3  
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment         3
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 10,281   10,281   11,670
Ending balance: individually evaluated for impairment         0
Ending balance: collectively evaluated for impairment         11,670
Commercial          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 13,868 13,073 10,245 9,225  
Charge-offs (1,727) (4,900) (2,795) (6,012)  
Recoveries 211 726 503 2,187  
Provision 5,840 (517) 9,317 2,982  
Valuation allowance, balance at the end of the period 18,192 8,382 18,192 8,382  
Ending balance: individually evaluated for impairment         1,015
Ending balance: collectively evaluated for impairment         9,230
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss 1,042,435   1,042,435   670,674
Ending balance: individually evaluated for impairment         8,418
Ending balance: collectively evaluated for impairment         662,256
Consumer          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period 31,087 18,060 16,206 16,769  
Charge-offs (3,881) (5,311) (16,466) (15,972)  
Recoveries 1,005 746 2,426 2,208  
Provision (3,200) 4,056 6,382 14,546  
Valuation allowance, balance at the end of the period 25,011 $ 17,551 25,011 $ 17,551  
Ending balance: individually evaluated for impairment         454
Ending balance: collectively evaluated for impairment         15,752
Financing Receivables:          
Financing Receivable, before Allowance for Credit Loss $ 190,138   190,138   257,921
Ending balance: individually evaluated for impairment         507
Ending balance: collectively evaluated for impairment         $ 257,414
Impact of ASU No. 2016-13          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     19,441    
Impact of ASU No. 2016-13 | Real estate | Residential 1-4 family          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     2,150    
Impact of ASU No. 2016-13 | Real estate | Commercial real estate          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     208    
Impact of ASU No. 2016-13 | Real estate | Home equity line of credit          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     (541)    
Impact of ASU No. 2016-13 | Real estate | Residential land          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     (64)    
Impact of ASU No. 2016-13 | Real estate | Commercial construction          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     289    
Impact of ASU No. 2016-13 | Real estate | Residential construction          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     14    
Impact of ASU No. 2016-13 | Commercial          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     922    
Impact of ASU No. 2016-13 | Consumer          
Allowance for credit losses:          
Valuation allowance, balance at the beginning of the period     $ 16,463