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Bank subsidiary (Details 6) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period $ 37,906 $ 40,646
Charge-offs (5,884) (19,490)
Recoveries 1,517 1,741
Provision 5,924 15,009
Valuation allowance, balance at the end of the period 39,463 37,906
Ending balance: individually evaluated for impairment 3,089 3,704
Ending balance: collectively evaluated for impairment 36,374 34,202
Financing Receivables:    
Ending balance 3,747,338 3,694,535
Ending balance: individually evaluated for impairment 123,871 128,488
Ending balance: collectively evaluated for impairment 3,623,467 3,566,047
Residential 1-4 family
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 6,500 6,497
Charge-offs (1,512) (5,528)
Recoveries 595 110
Provision 1,629 5,421
Valuation allowance, balance at the end of the period 7,212 6,500
Ending balance: individually evaluated for impairment 324 203
Ending balance: collectively evaluated for impairment 6,888 6,297
Financing Receivables:    
Ending balance 1,893,456 1,926,774
Ending balance: individually evaluated for impairment 30,132 26,012
Ending balance: collectively evaluated for impairment 1,863,324 1,900,762
Commercial real estate
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 1,688 1,474
Provision 390 214
Valuation allowance, balance at the end of the period 2,078 1,688
Ending balance: collectively evaluated for impairment 2,078 1,688
Financing Receivables:    
Ending balance 372,616 331,931
Ending balance: individually evaluated for impairment 12,938 13,397
Ending balance: collectively evaluated for impairment 359,678 318,534
Home equity line of credit
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 4,354 4,269
Charge-offs (39) (1,439)
Recoveries 88 25
Provision 440 1,499
Valuation allowance, balance at the end of the period 4,843 4,354
Ending balance: collectively evaluated for impairment 4,843 4,354
Financing Receivables:    
Ending balance 589,852 535,481
Ending balance: individually evaluated for impairment 1,838 1,450
Ending balance: collectively evaluated for impairment 588,014 534,031
Residential land
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 3,795 6,411
Charge-offs (1,247) (4,071)
Recoveries 245 170
Provision 547 1,285
Valuation allowance, balance at the end of the period 3,340 3,795
Ending balance: individually evaluated for impairment 2,322 2,525
Ending balance: collectively evaluated for impairment 1,018 1,270
Financing Receivables:    
Ending balance 34,200 45,392
Ending balance: individually evaluated for impairment 29,855 39,364
Ending balance: collectively evaluated for impairment 4,345 6,028
Commercial construction
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 1,888 1,714
Provision 367 174
Valuation allowance, balance at the end of the period 2,255 1,888
Ending balance: collectively evaluated for impairment 2,255 1,888
Financing Receivables:    
Ending balance 50,120 41,950
Ending balance: collectively evaluated for impairment 50,120 41,950
Residential construction
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 4 7
Provision (1) (3)
Valuation allowance, balance at the end of the period 3 4
Ending balance: collectively evaluated for impairment 3 4
Financing Receivables:    
Ending balance 1,797 3,327
Ending balance: collectively evaluated for impairment 1,797 3,327
Commercial loans
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 14,867 16,015
Charge-offs (1,834) (5,335)
Recoveries 356 869
Provision 572 3,318
Valuation allowance, balance at the end of the period 13,961 14,867
Ending balance: individually evaluated for impairment 443 976
Ending balance: collectively evaluated for impairment 13,518 13,891
Financing Receivables:    
Ending balance 704,255 716,427
Ending balance: individually evaluated for impairment 49,085 48,241
Ending balance: collectively evaluated for impairment 655,170 668,186
Consumer loans
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 3,806 3,325
Charge-offs (1,252) (3,117)
Recoveries 233 567
Provision 1,010 3,031
Valuation allowance, balance at the end of the period 3,797 3,806
Ending balance: collectively evaluated for impairment 3,797 3,806
Financing Receivables:    
Ending balance 101,042 93,253
Ending balance: individually evaluated for impairment 23 24
Ending balance: collectively evaluated for impairment 101,019 93,229
Unallocated
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 1,004 934
Provision 970 70
Valuation allowance, balance at the end of the period 1,974 1,004
Ending balance: collectively evaluated for impairment $ 1,974 $ 1,004