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Bank segment - Allowance for loan losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period $ 45,618 $ 40,116  
Charge-offs (1,147) (957)  
Recoveries 710 769  
Provision 614 995  
Valuation allowance, balance at the end of the period 45,795 40,923  
Ending balance: individually evaluated for impairment 5,548 5,685  
Ending balance: collectively evaluated for impairment 40,247 35,238  
Financing Receivables:      
Total financing receivables 4,453,531 4,196,369 $ 4,440,989
Ending balance: individually evaluated for impairment 48,983 55,631  
Ending balance: collectively evaluated for impairment 4,404,548 4,140,738  
Residential 1-4 family      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 4,662 5,534  
Charge-offs (156) (266)  
Recoveries 12 341  
Provision 403 (134)  
Valuation allowance, balance at the end of the period 4,921 5,475  
Ending balance: individually evaluated for impairment 1,429 906  
Ending balance: collectively evaluated for impairment 3,492 4,569  
Financing Receivables:      
Total financing receivables 2,039,099 1,985,812 2,044,205
Ending balance: individually evaluated for impairment 23,089 20,141  
Ending balance: collectively evaluated for impairment 2,016,010 1,965,671  
Commercial real estate      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 8,954 5,059  
Provision 2,274 656  
Valuation allowance, balance at the end of the period 11,228 5,715  
Ending balance: individually evaluated for impairment 1,785 1,544  
Ending balance: collectively evaluated for impairment 9,443 4,171  
Financing Receivables:      
Total financing receivables 561,189 452,303 531,917
Ending balance: individually evaluated for impairment 4,998 4,558  
Ending balance: collectively evaluated for impairment 556,191 447,745  
Home equity line of credit      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 6,982 5,229  
Charge-offs (3) 0  
Recoveries 31 11  
Provision (487) 729  
Valuation allowance, balance at the end of the period 6,523 5,969  
Ending balance: individually evaluated for impairment 144 0  
Ending balance: collectively evaluated for impairment 6,379 5,969  
Financing Receivables:      
Total financing receivables 814,265 764,483 818,815
Ending balance: individually evaluated for impairment 1,183 1,164  
Ending balance: collectively evaluated for impairment 813,082 763,319  
Residential land      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 1,875 1,817  
Charge-offs 0 (6)  
Recoveries 49 86  
Provision 362 (322)  
Valuation allowance, balance at the end of the period 2,286 1,575  
Ending balance: individually evaluated for impairment 1,085 1,102  
Ending balance: collectively evaluated for impairment 1,201 473  
Financing Receivables:      
Total financing receivables 18,155 15,906 16,240
Ending balance: individually evaluated for impairment 7,819 10,351  
Ending balance: collectively evaluated for impairment 10,336 5,555  
Commercial construction      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 5,471 2,397  
Provision (2,634) 666  
Valuation allowance, balance at the end of the period 2,837 3,063  
Ending balance: collectively evaluated for impairment 2,837 3,063  
Financing Receivables:      
Total financing receivables 77,164 66,578 96,438
Ending balance: collectively evaluated for impairment 77,164 66,578  
Residential construction      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 28 19  
Provision (7) 5  
Valuation allowance, balance at the end of the period 21 24  
Ending balance: collectively evaluated for impairment 21 24  
Financing Receivables:      
Total financing receivables 20,804 16,474 18,961
Ending balance: collectively evaluated for impairment 20,804 16,474  
Commercial loans      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 14,017 15,803  
Charge-offs (46) (124)  
Recoveries 341 100  
Provision 268 (187)  
Valuation allowance, balance at the end of the period 14,580 15,592  
Ending balance: individually evaluated for impairment 1,096 2,133  
Ending balance: collectively evaluated for impairment 13,484 13,459  
Financing Receivables:      
Total financing receivables 803,545 786,611 791,757
Ending balance: individually evaluated for impairment 11,879 19,399  
Ending balance: collectively evaluated for impairment 791,666 767,212  
Consumer loans      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 3,629 2,367  
Charge-offs (942) (561)  
Recoveries 277 231  
Provision 435 279  
Valuation allowance, balance at the end of the period 3,399 2,316  
Ending balance: individually evaluated for impairment 9    
Ending balance: collectively evaluated for impairment 3,390 2,316  
Financing Receivables:      
Total financing receivables 119,310 108,202 $ 122,656
Ending balance: individually evaluated for impairment 15 18  
Ending balance: collectively evaluated for impairment 119,295 108,184  
Unallocated      
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period 0 1,891  
Provision 0 (697)  
Valuation allowance, balance at the end of the period 0 1,194  
Ending balance: collectively evaluated for impairment $ 0 $ 1,194