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Bank segment - Allowance for loan losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period $ 55,331 $ 46,365 $ 50,038 $ 45,618  
Charge-offs (3,193) (1,720) (8,656) (4,681)  
Recoveries 852 632 2,089 1,901  
Provision 5,747 2,997 15,266 5,436  
Valuation allowance, balance at the end of the period 58,737 48,274 58,737 48,274  
Ending balance: individually evaluated for impairment 8,513   8,513   $ 6,320
Ending balance: collectively evaluated for impairment 50,224   50,224   43,718
Financing Receivables:          
Total financing receivables 4,739,773   4,739,773   4,622,068
Ending balance: individually evaluated for impairment 64,338   64,338   53,685
Ending balance: collectively evaluated for impairment 4,675,435   4,675,435   4,568,383
Residential 1-4 family          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 4,384 4,291 4,186 4,662  
Charge-offs (373) (138) (433) (352)  
Recoveries 92 45 144 112  
Provision 154 285 360 61  
Valuation allowance, balance at the end of the period 4,257 4,483 4,257 4,483  
Ending balance: individually evaluated for impairment 1,625   1,625   1,453
Ending balance: collectively evaluated for impairment 2,632   2,632   2,733
Financing Receivables:          
Total financing receivables 2,054,460   2,054,460   2,069,665
Ending balance: individually evaluated for impairment 21,566   21,566   22,457
Ending balance: collectively evaluated for impairment 2,032,894   2,032,894   2,047,208
Commercial real estate          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 13,561 10,420 11,342 8,954  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 1,289 987 3,508 2,453  
Valuation allowance, balance at the end of the period 14,850 11,407 14,850 11,407  
Ending balance: individually evaluated for impairment 161   161   0
Ending balance: collectively evaluated for impairment 14,689   14,689   11,342
Financing Receivables:          
Total financing receivables 774,349   774,349   690,561
Ending balance: individually evaluated for impairment 3,762   3,762   1,188
Ending balance: collectively evaluated for impairment 770,587   770,587   689,373
Home equity line of credit          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 7,836 6,613 7,260 6,982  
Charge-offs (108) (185) (108) (205)  
Recoveries 15 33 46 72  
Provision (248) 446 297 58  
Valuation allowance, balance at the end of the period 7,495 6,907 7,495 6,907  
Ending balance: individually evaluated for impairment 1,040   1,040   442
Ending balance: collectively evaluated for impairment 6,455   6,455   6,818
Financing Receivables:          
Total financing receivables 859,952   859,952   846,294
Ending balance: individually evaluated for impairment 5,886   5,886   3,225
Ending balance: collectively evaluated for impairment 854,066   854,066   843,069
Residential land          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 1,689 2,103 1,671 1,875  
Charge-offs 0 0 0 0  
Recoveries 187 34 306 219  
Provision 23 (73) (78) (30)  
Valuation allowance, balance at the end of the period 1,899 2,064 1,899 2,064  
Ending balance: individually evaluated for impairment 951   951   891
Ending balance: collectively evaluated for impairment 948   948   780
Financing Receivables:          
Total financing receivables 19,666   19,666   18,229
Ending balance: individually evaluated for impairment 4,428   4,428   5,683
Ending balance: collectively evaluated for impairment 15,238   15,238   12,546
Commercial construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 6,993 2,575 4,461 5,471  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 179 944 2,711 (1,952)  
Valuation allowance, balance at the end of the period 7,172 3,519 7,172 3,519  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 7,172   7,172   4,461
Financing Receivables:          
Total financing receivables 140,758   140,758   100,796
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 140,758   140,758   100,796
Residential construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 12 18 13 28  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (2) (5) (3) (15)  
Valuation allowance, balance at the end of the period 10 13 10 13  
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 10   10   13
Financing Receivables:          
Total financing receivables 15,073   15,073   14,089
Ending balance: individually evaluated for impairment 0   0   0
Ending balance: collectively evaluated for impairment 15,073   15,073   14,089
Commercial loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 17,085 17,469 17,208 14,017  
Charge-offs (833) (126) (3,138) (928)  
Recoveries 347 279 907 726  
Provision 2,457 (920) 4,079 2,887  
Valuation allowance, balance at the end of the period 19,056 16,702 19,056 16,702  
Ending balance: individually evaluated for impairment 4,734   4,734   3,527
Ending balance: collectively evaluated for impairment 14,322   14,322   13,681
Financing Receivables:          
Total financing receivables 717,450   717,450   758,659
Ending balance: individually evaluated for impairment 28,685   28,685   21,119
Ending balance: collectively evaluated for impairment 688,765   688,765   737,540
Consumer loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 3,771 2,876 3,897 3,629  
Charge-offs (1,879) (1,271) (4,977) (3,196)  
Recoveries 211 241 686 772  
Provision 1,895 1,333 4,392 1,974  
Valuation allowance, balance at the end of the period 3,998 3,179 3,998 3,179  
Ending balance: individually evaluated for impairment 2   2   7
Ending balance: collectively evaluated for impairment 3,996   3,996   3,890
Financing Receivables:          
Total financing receivables 158,065   158,065   123,775
Ending balance: individually evaluated for impairment 11   11   13
Ending balance: collectively evaluated for impairment 158,054   158,054   123,762
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