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Bank segment - Allowance for loan losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period $ 46,365 $ 42,372 $ 45,618 $ 40,116  
Charge-offs (1,720) (2,184) (4,681) (4,125)  
Recoveries 632 1,723 1,901 3,904  
Provision 2,997 1,550 5,436 3,566  
Valuation allowance, balance at the end of the period 48,274 43,461 48,274 43,461  
Ending balance: individually evaluated for impairment 5,867 2,915 5,867 2,915  
Ending balance: collectively evaluated for impairment 42,407 40,546 42,407 40,546  
Financing Receivables:          
Total financing receivables 4,541,633 4,342,389 4,541,633 4,342,389 $ 4,440,989
Ending balance: individually evaluated for impairment 54,046 45,107 54,046 45,107  
Ending balance: collectively evaluated for impairment 4,487,587 4,297,282 4,487,587 4,297,282  
Residential 1-4 family          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 4,291 5,667 4,662 5,534  
Charge-offs (138) (632) (352) (992)  
Recoveries 45 160 112 1,056  
Provision 285 670 61 267  
Valuation allowance, balance at the end of the period 4,483 5,865 4,483 5,865  
Ending balance: individually evaluated for impairment 1,388 917 1,388 917  
Ending balance: collectively evaluated for impairment 3,095 4,948 3,095 4,948  
Financing Receivables:          
Total financing receivables 2,062,458 2,030,337 2,062,458 2,030,337 2,044,205
Ending balance: individually evaluated for impairment 22,560 20,015 22,560 20,015  
Ending balance: collectively evaluated for impairment 2,039,898 2,010,322 2,039,898 2,010,322  
Commercial real estate          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 10,420 7,230 8,954 5,059  
Provision 987 3 2,453 2,174  
Valuation allowance, balance at the end of the period 11,407 7,233 11,407 7,233  
Ending balance: individually evaluated for impairment 0 4 0 4  
Ending balance: collectively evaluated for impairment 11,407 7,229 11,407 7,229  
Financing Receivables:          
Total financing receivables 618,113 502,356 618,113 502,356 531,917
Ending balance: individually evaluated for impairment 0 754 0 754  
Ending balance: collectively evaluated for impairment 618,113 501,602 618,113 501,602  
Home equity line of credit          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 6,613 7,081 6,982 5,229  
Charge-offs (185) (46) (205) (182)  
Recoveries 33 299 72 624  
Provision 446 (119) 58 1,544  
Valuation allowance, balance at the end of the period 6,907 7,215 6,907 7,215  
Ending balance: individually evaluated for impairment 469 8 469 8  
Ending balance: collectively evaluated for impairment 6,438 7,207 6,438 7,207  
Financing Receivables:          
Total financing receivables 832,267 808,991 832,267 808,991 818,815
Ending balance: individually evaluated for impairment 2,909 392 2,909 392  
Ending balance: collectively evaluated for impairment 829,358 808,599 829,358 808,599  
Residential land          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 2,103 1,837 1,875 1,817  
Charge-offs 0 (28) 0 (81)  
Recoveries 34 90 219 253  
Provision (73) (92) (30) (182)  
Valuation allowance, balance at the end of the period 2,064 1,807 2,064 1,807  
Ending balance: individually evaluated for impairment 919 1,171 919 1,171  
Ending balance: collectively evaluated for impairment 1,145 636 1,145 636  
Financing Receivables:          
Total financing receivables 17,369 16,935 17,369 16,935 16,240
Ending balance: individually evaluated for impairment 5,710 8,872 5,710 8,872  
Ending balance: collectively evaluated for impairment 11,659 8,063 11,659 8,063  
Commercial construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 2,575 3,390 5,471 2,397  
Provision 944 1,724 (1,952) 2,717  
Valuation allowance, balance at the end of the period 3,519 5,114 3,519 5,114  
Ending balance: collectively evaluated for impairment 3,519 5,114 3,519 5,114  
Financing Receivables:          
Total financing receivables 80,230 87,461 80,230 87,461 96,438
Ending balance: collectively evaluated for impairment 80,230 87,461 80,230 87,461  
Residential construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 18 26 28 19  
Provision (5) 3 (15) 10  
Valuation allowance, balance at the end of the period 13 29 13 29  
Ending balance: collectively evaluated for impairment 13 29 13 29  
Financing Receivables:          
Total financing receivables 14,318 18,699 14,318 18,699 18,961
Ending balance: collectively evaluated for impairment 14,318 18,699 14,318 18,699  
Commercial loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 17,469 15,144 14,017 15,803  
Charge-offs (126) (886) (928) (1,256)  
Recoveries 279 952 726 1,277  
Provision (920) (1,130) 2,887 (1,744)  
Valuation allowance, balance at the end of the period 16,702 14,080 16,702 14,080  
Ending balance: individually evaluated for impairment 3,084 810 3,084 810  
Ending balance: collectively evaluated for impairment 13,618 13,270 13,618 13,270  
Financing Receivables:          
Total financing receivables 798,428 770,079 798,428 770,079 791,757
Ending balance: individually evaluated for impairment 22,853 15,058 22,853 15,058  
Ending balance: collectively evaluated for impairment 775,575 755,021 775,575 755,021  
Consumer loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 2,876 1,997 3,629 2,367  
Charge-offs (1,271) (592) (3,196) (1,614)  
Recoveries 241 222 772 694  
Provision 1,333 491 1,974 671  
Valuation allowance, balance at the end of the period 3,179 2,118 3,179 2,118  
Ending balance: individually evaluated for impairment 7 5 7 5  
Ending balance: collectively evaluated for impairment 3,172 2,113 3,172 2,113  
Financing Receivables:          
Total financing receivables 118,450 107,531 118,450 107,531 $ 122,656
Ending balance: individually evaluated for impairment 14 16 14 16  
Ending balance: collectively evaluated for impairment 118,436 107,515 118,436 107,515  
Unallocated          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 0 0 0 1,891  
Provision 0 0 0 (1,891)  
Valuation allowance, balance at the end of the period 0 0 0 0  
Ending balance: collectively evaluated for impairment $ 0 $ 0 $ 0 $ 0