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Bank segment (Details 6) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period $ 42,372 $ 41,004 $ 40,116 $ 41,985  
Charge-offs (2,184) (865) (4,125) (5,648)  
Recoveries 1,723 859 3,904 3,762  
Provision 1,550 54 3,566 953  
Valuation allowance, balance at the end of the period 43,461 41,052 43,461 41,052  
Valuation allowance, balance at the end of the period 43,461 41,052 43,461 41,052  
Ending balance: individually evaluated for impairment 2,915 6,096 2,915 6,096  
Ending balance: collectively evaluated for impairment 40,546 34,956 40,546 34,956  
Financing Receivables:          
Total financing receivables 4,342,389 4,055,389 4,342,389 4,055,389 4,158,953
Ending balance: individually evaluated for impairment 45,107 63,110 45,107 63,110  
Ending balance: collectively evaluated for impairment 4,297,282 3,992,279 4,297,282 3,992,279  
Residential 1-4 family
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 5,667 6,357 5,534 6,068  
Charge-offs (632) (106) (992) (1,162)  
Recoveries 160 157 1,056 1,382  
Provision 670 (604) 267 (484)  
Valuation allowance, balance at the end of the period 5,865 5,804 5,865 5,804  
Valuation allowance, balance at the end of the period 5,865 5,804 5,865 5,804  
Ending balance: individually evaluated for impairment 917 944 917 944  
Ending balance: collectively evaluated for impairment 4,948 4,860 4,948 4,860  
Financing Receivables:          
Total financing receivables 2,030,337 2,015,082 2,030,337 2,015,082 2,006,007
Ending balance: individually evaluated for impairment 20,015 22,123 20,015 22,123  
Ending balance: collectively evaluated for impairment 2,010,322 1,992,959 2,010,322 1,992,959  
Commercial real estate
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 7,230 4,117 5,059 2,965  
Provision 3 204 2,174 1,356  
Valuation allowance, balance at the end of the period 7,233 4,321 7,233 4,321  
Valuation allowance, balance at the end of the period 7,233 4,321 7,233 4,321  
Ending balance: individually evaluated for impairment 4 888 4 888  
Ending balance: collectively evaluated for impairment 7,229 3,433 7,229 3,433  
Financing Receivables:          
Total financing receivables 502,356 405,037 502,356 405,037 440,443
Ending balance: individually evaluated for impairment 754 4,484 754 4,484  
Ending balance: collectively evaluated for impairment 501,602 400,553 501,602 400,553  
Home equity line of credit
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 7,081 5,009 5,229 4,493  
Charge-offs (46) (44) (182) (782)  
Recoveries 299 78 624 334  
Provision (119) 12 1,544 1,010  
Valuation allowance, balance at the end of the period 7,215 5,055 7,215 5,055  
Valuation allowance, balance at the end of the period 7,215 5,055 7,215 5,055  
Ending balance: individually evaluated for impairment 8 0 8 0  
Ending balance: collectively evaluated for impairment 7,207 5,055 7,207 5,055  
Financing Receivables:          
Total financing receivables 808,991 703,210 808,991 703,210 739,331
Ending balance: individually evaluated for impairment 392 960 392 960  
Ending balance: collectively evaluated for impairment 808,599 702,250 808,599 702,250  
Residential land
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 1,837 2,187 1,817 4,275  
Charge-offs (28) (3) (81) (238)  
Recoveries 90 282 253 782  
Provision (92) (361) (182) (2,714)  
Valuation allowance, balance at the end of the period 1,807 2,105 1,807 2,105  
Valuation allowance, balance at the end of the period 1,807 2,105 1,807 2,105  
Ending balance: individually evaluated for impairment 1,171 1,585 1,171 1,585  
Ending balance: collectively evaluated for impairment 636 520 636 520  
Financing Receivables:          
Total financing receivables 16,935 18,400 16,935 18,400 16,176
Ending balance: individually evaluated for impairment 8,872 12,747 8,872 12,747  
Ending balance: collectively evaluated for impairment 8,063 5,653 8,063 5,653  
Commercial construction
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 3,390 2,305 2,397 2,023  
Provision 1,724 44 2,717 326  
Valuation allowance, balance at the end of the period 5,114 2,349 5,114 2,349  
Valuation allowance, balance at the end of the period 5,114 2,349 5,114 2,349  
Ending balance: collectively evaluated for impairment 5,114 2,349 5,114 2,349  
Financing Receivables:          
Total financing receivables 87,461 51,067 87,461 51,067 52,112
Ending balance: collectively evaluated for impairment 87,461 51,067 87,461 51,067  
Residential construction
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 26 14 19 9  
Provision 3 2 10 7  
Valuation allowance, balance at the end of the period 29 16 29 16  
Valuation allowance, balance at the end of the period 29 16 29 16  
Ending balance: collectively evaluated for impairment 29 16 29 16  
Financing Receivables:          
Total financing receivables 18,699 10,460 18,699 10,460 12,774
Ending balance: collectively evaluated for impairment 18,699 10,460 18,699 10,460  
Commercial loans
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 15,144 16,307 15,803 15,931  
Charge-offs (886) (305) (1,256) (1,655)  
Recoveries 952 166 1,277 778  
Provision (1,130) (361) (1,744) 753  
Valuation allowance, balance at the end of the period 14,080 15,807 14,080 15,807  
Valuation allowance, balance at the end of the period 14,080 15,807 14,080 15,807  
Ending balance: individually evaluated for impairment 810 2,679 810 2,679  
Ending balance: collectively evaluated for impairment 13,270 13,128 13,270 13,128  
Financing Receivables:          
Total financing receivables 770,079 749,733 770,079 749,733 783,388
Ending balance: individually evaluated for impairment 15,058 22,777 15,058 22,777  
Ending balance: collectively evaluated for impairment 755,021 726,956 755,021 726,956  
Consumer loans
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 1,997 2,399 2,367 4,019  
Charge-offs (592) (407) (1,614) (1,811)  
Recoveries 222 176 694 486  
Provision 491 42 671 (484)  
Valuation allowance, balance at the end of the period 2,118 2,210 2,118 2,210  
Valuation allowance, balance at the end of the period 2,118 2,210 2,118 2,210  
Ending balance: individually evaluated for impairment 5   5    
Ending balance: collectively evaluated for impairment 2,113 2,210 2,113 2,210  
Financing Receivables:          
Total financing receivables 107,531 102,400 107,531 102,400 108,722
Ending balance: individually evaluated for impairment 16 19 16 19  
Ending balance: collectively evaluated for impairment 107,515 102,381 107,515 102,381  
Unallocated
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 0 2,309 1,891 2,202  
Provision 0 1,076 (1,891) 1,183  
Valuation allowance, balance at the end of the period 0 3,385 0 3,385  
Valuation allowance, balance at the end of the period 0 3,385 0 3,385  
Ending balance: collectively evaluated for impairment $ 0 $ 3,385 $ 0 $ 3,385