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Bank segment (Details 6) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period $ 40,923 $ 42,730 $ 40,116 $ 41,985  
Charge-offs (984) (2,605) (1,941) (4,783)  
Recoveries 1,412 1,838 2,181 2,903  
Provision 1,021 (959) 2,016 899  
Valuation allowance, balance at the end of the period 42,372 41,004 42,372 41,004  
Valuation allowance, balance at the end of the period 42,372 41,004 42,372 41,004  
Ending balance: individually evaluated for impairment 4,370 6,772 4,370 6,772  
Ending balance: collectively evaluated for impairment 38,002 34,232 38,002 34,232  
Financing Receivables:          
Total financing receivables 4,295,045 3,963,389 4,295,045 3,963,389 4,158,953
Ending balance: individually evaluated for impairment 50,481 63,557 50,481 63,557  
Ending balance: collectively evaluated for impairment 4,244,564 3,899,832 4,244,564 3,899,832  
Residential 1-4 family
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 5,475 6,011 5,534 6,068  
Charge-offs (94) (846) (360) (1,056)  
Recoveries 555 1,033 896 1,225  
Provision (269) 159 (403) 120  
Valuation allowance, balance at the end of the period 5,667 6,357 5,667 6,357  
Valuation allowance, balance at the end of the period 5,667 6,357 5,667 6,357  
Ending balance: individually evaluated for impairment 969 944 969 944  
Ending balance: collectively evaluated for impairment 4,698 5,413 4,698 5,413  
Financing Receivables:          
Total financing receivables 2,019,092 2,001,035 2,019,092 2,001,035 2,006,007
Ending balance: individually evaluated for impairment 17,978 21,417 17,978 21,417  
Ending balance: collectively evaluated for impairment 2,001,114 1,979,618 2,001,114 1,979,618  
Commercial real estate
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 5,715 6,656 5,059 2,965  
Provision 1,515 (2,539) 2,171 1,152  
Valuation allowance, balance at the end of the period 7,230 4,117 7,230 4,117  
Valuation allowance, balance at the end of the period 7,230 4,117 7,230 4,117  
Ending balance: individually evaluated for impairment 941 820 941 820  
Ending balance: collectively evaluated for impairment 6,289 3,297 6,289 3,297  
Financing Receivables:          
Total financing receivables 476,116 382,735 476,116 382,735 440,443
Ending balance: individually evaluated for impairment 4,512 3,811 4,512 3,811  
Ending balance: collectively evaluated for impairment 471,604 378,924 471,604 378,924  
Home equity line of credit
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 5,969 4,557 5,229 4,493  
Charge-offs (136) (68) (136) (738)  
Recoveries 314 62 325 256  
Provision 934 458 1,663 998  
Valuation allowance, balance at the end of the period 7,081 5,009 7,081 5,009  
Valuation allowance, balance at the end of the period 7,081 5,009 7,081 5,009  
Ending balance: individually evaluated for impairment 14 0 14 0  
Ending balance: collectively evaluated for impairment 7,067 5,009 7,067 5,009  
Financing Receivables:          
Total financing receivables 790,837 673,727 790,837 673,727 739,331
Ending balance: individually evaluated for impairment 612 837 612 837  
Ending balance: collectively evaluated for impairment 790,225 672,890 790,225 672,890  
Residential land
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 1,575 2,743 1,817 4,275  
Charge-offs (47) (8) (53) (235)  
Recoveries 77 363 163 500  
Provision 232 (911) (90) (2,353)  
Valuation allowance, balance at the end of the period 1,837 2,187 1,837 2,187  
Valuation allowance, balance at the end of the period 1,837 2,187 1,837 2,187  
Ending balance: individually evaluated for impairment 1,202 1,641 1,202 1,641  
Ending balance: collectively evaluated for impairment 635 546 635 546  
Financing Receivables:          
Total financing receivables 17,189 21,836 17,189 21,836 16,176
Ending balance: individually evaluated for impairment 9,320 16,041 9,320 16,041  
Ending balance: collectively evaluated for impairment 7,869 5,795 7,869 5,795  
Commercial construction
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 3,063 1,872 2,397 2,023  
Provision 327 433 993 282  
Valuation allowance, balance at the end of the period 3,390 2,305 3,390 2,305  
Valuation allowance, balance at the end of the period 3,390 2,305 3,390 2,305  
Ending balance: collectively evaluated for impairment 3,390 2,305 3,390 2,305  
Financing Receivables:          
Total financing receivables 80,312 50,114 80,312 50,114 52,112
Ending balance: collectively evaluated for impairment 80,312 50,114 80,312 50,114  
Residential construction
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 24 12 19 9  
Provision 2 2 7 5  
Valuation allowance, balance at the end of the period 26 14 26 14  
Valuation allowance, balance at the end of the period 26 14 26 14  
Ending balance: collectively evaluated for impairment 26 14 26 14  
Financing Receivables:          
Total financing receivables 17,441 9,664 17,441 9,664 12,774
Ending balance: collectively evaluated for impairment 17,441 9,664 17,441 9,664  
Commercial loans
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 15,592 14,963 15,803 15,931  
Charge-offs (246) (924) (370) (1,350)  
Recoveries 225 220 325 612  
Provision (427) 2,048 (614) 1,114  
Valuation allowance, balance at the end of the period 15,144 16,307 15,144 16,307  
Valuation allowance, balance at the end of the period 15,144 16,307 15,144 16,307  
Ending balance: individually evaluated for impairment 1,239 3,367 1,239 3,367  
Ending balance: collectively evaluated for impairment 13,905 12,940 13,905 12,940  
Financing Receivables:          
Total financing receivables 782,804 719,519 782,804 719,519 783,388
Ending balance: individually evaluated for impairment 18,042 21,431 18,042 21,431  
Ending balance: collectively evaluated for impairment 764,762 698,088 764,762 698,088  
Consumer loans
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 2,316 3,655 2,367 4,019  
Charge-offs (461) (759) (1,022) (1,404)  
Recoveries 241 160 472 310  
Provision (99) (657) 180 (526)  
Valuation allowance, balance at the end of the period 1,997 2,399 1,997 2,399  
Valuation allowance, balance at the end of the period 1,997 2,399 1,997 2,399  
Ending balance: individually evaluated for impairment 5   5    
Ending balance: collectively evaluated for impairment 1,992 2,399 1,992 2,399  
Financing Receivables:          
Total financing receivables 111,254 104,759 111,254 104,759 108,722
Ending balance: individually evaluated for impairment 17 20 17 20  
Ending balance: collectively evaluated for impairment 111,237 104,739 111,237 104,739  
Unallocated
          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 1,194 2,261 1,891 2,202  
Provision (1,194) 48 (1,891) 107  
Valuation allowance, balance at the end of the period 0 2,309 0 2,309  
Valuation allowance, balance at the end of the period 0 2,309 0 2,309  
Ending balance: collectively evaluated for impairment $ 0 $ 2,309 $ 0 $ 2,309