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Bank segment - Allowance for loan losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period $ 53,895 $ 55,997 $ 53,637 $ 55,533  
Charge-offs (4,581) (3,234) (9,454) (7,574)  
Recoveries 726 759 2,316 1,656  
Provision 2,763 2,834 6,304 6,741  
Valuation allowance, balance at the end of the period 52,803 56,356 52,803 56,356  
Ending balance: individually evaluated for impairment 2,848   2,848   $ 2,730
Ending balance: collectively evaluated for impairment 49,955   49,955   50,907
Financing Receivables:          
Total financing receivables 4,775,413   4,775,413   4,671,577
Ending balance: individually evaluated for impairment 39,583   39,583   33,393
Ending balance: collectively evaluated for impairment 4,735,830   4,735,830   4,638,184
Residential 1-4 family          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 2,525 2,781 2,902 2,873  
Charge-offs 0 0 (31) (6)  
Recoveries 14 49 68 58  
Provision 400 300 0 205  
Valuation allowance, balance at the end of the period 2,939 3,130 2,939 3,130  
Ending balance: individually evaluated for impairment 1,027   1,027   1,248
Ending balance: collectively evaluated for impairment 1,912   1,912   1,654
Financing Receivables:          
Total financing receivables 2,099,950   2,099,950   2,118,047
Ending balance: individually evaluated for impairment 17,605   17,605   18,284
Ending balance: collectively evaluated for impairment 2,082,345   2,082,345   2,099,763
Commercial real estate          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 15,959 16,504 15,796 16,004  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (661) 2,336 (498) 2,836  
Valuation allowance, balance at the end of the period 15,298 18,840 15,298 18,840  
Ending balance: individually evaluated for impairment 53   53   65
Ending balance: collectively evaluated for impairment 15,245   15,245   15,731
Financing Receivables:          
Total financing receivables 758,835   758,835   733,106
Ending balance: individually evaluated for impairment 993   993   1,016
Ending balance: collectively evaluated for impairment 757,842   757,842   732,090
Home equity line of credit          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 7,982 5,417 7,522 5,039  
Charge-offs (144) 0 (144) (14)  
Recoveries 13 39 27 130  
Provision (517) 71 (71) 372  
Valuation allowance, balance at the end of the period 7,334 5,527 7,334 5,527  
Ending balance: individually evaluated for impairment 1,161   1,161   647
Ending balance: collectively evaluated for impairment 6,173   6,173   6,875
Financing Receivables:          
Total financing receivables 938,902   938,902   913,052
Ending balance: individually evaluated for impairment 13,849   13,849   8,188
Ending balance: collectively evaluated for impairment 925,053   925,053   904,864
Residential land          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 674 1,479 896 1,738  
Charge-offs (9) (92) (17) (92)  
Recoveries 46 15 51 218  
Provision (69) (138) (288) (600)  
Valuation allowance, balance at the end of the period 642 1,264 642 1,264  
Ending balance: individually evaluated for impairment 7   7   47
Ending balance: collectively evaluated for impairment 635   635   849
Financing Receivables:          
Total financing receivables 16,032   16,032   15,797
Ending balance: individually evaluated for impairment 1,171   1,171   1,265
Ending balance: collectively evaluated for impairment 14,861   14,861   14,532
Commercial construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 4,361 7,257 4,671 6,449  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 255 (2,551) (55) (1,743)  
Valuation allowance, balance at the end of the period 4,616 4,706 4,616 4,706  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 4,616   4,616   4,671
Financing Receivables:          
Total financing receivables 124,421   124,421   108,273
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 124,421   124,421   108,273
Residential construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 4 11 12 12  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 0 (2) (8) (3)  
Valuation allowance, balance at the end of the period 4 9 4 9  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 4   4   12
Financing Receivables:          
Total financing receivables 14,873   14,873   14,910
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 14,873   14,873   14,910
Commercial loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 10,355 14,902 10,851 16,618  
Charge-offs (540) (752) (1,142) (2,262)  
Recoveries 280 299 1,450 596  
Provision 66 103 (998) (400)  
Valuation allowance, balance at the end of the period 10,161 14,552 10,161 14,552  
Ending balance: individually evaluated for impairment 597   597   694
Ending balance: collectively evaluated for impairment 9,564   9,564   10,157
Financing Receivables:          
Total financing receivables 593,596   593,596   544,828
Ending balance: individually evaluated for impairment 5,874   5,874   4,574
Ending balance: collectively evaluated for impairment 587,722   587,722   540,254
Consumer loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 12,035 7,646 10,987 6,800  
Charge-offs (3,888) (2,390) (8,120) (5,200)  
Recoveries 373 357 720 654  
Provision 3,289 2,715 8,222 6,074  
Valuation allowance, balance at the end of the period 11,809 8,328 11,809 8,328  
Ending balance: individually evaluated for impairment 3   3   29
Ending balance: collectively evaluated for impairment 11,806   11,806   10,958
Financing Receivables:          
Total financing receivables 228,804   228,804   223,564
Ending balance: individually evaluated for impairment 91   91   66
Ending balance: collectively evaluated for impairment 228,713   228,713   223,498
Unallocated          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 0 0 0 0  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 0 0 0 0  
Valuation allowance, balance at the end of the period 0 $ 0 0 $ 0  
Ending balance: collectively evaluated for impairment $ 0   $ 0   $ 0