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Bank subsidiary (Details 6) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period $ 37,906 $ 40,646
Charge-offs (10,035) (19,490)
Recoveries 2,435 1,741
Provision 9,504 15,009
Valuation allowance, balance at the end of the period 39,810 37,906
Ending balance: individually evaluated for impairment 4,621 3,704
Ending balance: collectively evaluated for impairment 35,189 34,202
Financing Receivables:    
Ending balance 3,757,903 3,694,535
Ending balance: individually evaluated for impairment 74,878 128,488
Ending balance: collectively evaluated for impairment 3,683,025 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 (2,476) (5,528)
Recoveries 974 110
Provision 1,729 5,421
Valuation allowance, balance at the end of the period 6,727 6,500
Ending balance: individually evaluated for impairment 324 203
Ending balance: collectively evaluated for impairment 6,403 6,297
Financing Receivables:    
Ending balance 1,899,580 1,926,774
Ending balance: individually evaluated for impairment 26,912 26,012
Ending balance: collectively evaluated for impairment 1,872,668 1,900,762
Commercial real estate
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 1,688 1,474
Provision 394 214
Valuation allowance, balance at the end of the period 2,082 1,688
Ending balance: individually evaluated for impairment 7  
Ending balance: collectively evaluated for impairment 2,075 1,688
Financing Receivables:    
Ending balance 367,765 331,931
Ending balance: individually evaluated for impairment 2,929 13,397
Ending balance: collectively evaluated for impairment 364,836 318,534
Home equity line of credit
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 4,354 4,269
Charge-offs (402) (1,439)
Recoveries 95 25
Provision 818 1,499
Valuation allowance, balance at the end of the period 4,865 4,354
Ending balance: individually evaluated for impairment 313  
Ending balance: collectively evaluated for impairment 4,552 4,354
Financing Receivables:    
Ending balance 604,279 535,481
Ending balance: individually evaluated for impairment 1,913 1,450
Ending balance: collectively evaluated for impairment 602,366 534,031
Residential land
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 3,795 6,411
Charge-offs (2,340) (4,071)
Recoveries 471 170
Provision 1,871 1,285
Valuation allowance, balance at the end of the period 3,797 3,795
Ending balance: individually evaluated for impairment 2,321 2,525
Ending balance: collectively evaluated for impairment 1,476 1,270
Financing Receivables:    
Ending balance 29,280 45,392
Ending balance: individually evaluated for impairment 25,146 39,364
Ending balance: collectively evaluated for impairment 4,134 6,028
Commercial construction
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 1,888 1,714
Provision 43 174
Valuation allowance, balance at the end of the period 1,931 1,888
Ending balance: collectively evaluated for impairment 1,931 1,888
Financing Receivables:    
Ending balance 42,913 41,950
Ending balance: collectively evaluated for impairment 42,913 41,950
Residential construction
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 4 7
Provision 4 (3)
Valuation allowance, balance at the end of the period 8 4
Ending balance: collectively evaluated for impairment 8 4
Financing Receivables:    
Ending balance 5,648 3,327
Ending balance: collectively evaluated for impairment 5,648 3,327
Commercial loans
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 14,867 16,015
Charge-offs (2,964) (5,335)
Recoveries 511 869
Provision 1,916 3,318
Valuation allowance, balance at the end of the period 14,330 14,867
Ending balance: individually evaluated for impairment 1,656 976
Ending balance: collectively evaluated for impairment 12,674 13,891
Financing Receivables:    
Ending balance 704,100 716,427
Ending balance: individually evaluated for impairment 17,956 48,241
Ending balance: collectively evaluated for impairment 686,144 668,186
Consumer loans
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 3,806 3,325
Charge-offs (1,853) (3,117)
Recoveries 384 567
Provision 1,472 3,031
Valuation allowance, balance at the end of the period 3,809 3,806
Ending balance: collectively evaluated for impairment 3,809 3,806
Financing Receivables:    
Ending balance 104,338 93,253
Ending balance: individually evaluated for impairment 22 24
Ending balance: collectively evaluated for impairment 104,316 93,229
Unallocated
    
Allowance for loan losses:    
Valuation allowance, balance at the beginning of the period 1,004 934
Provision 1,257 70
Valuation allowance, balance at the end of the period 2,261 1,004
Ending balance: collectively evaluated for impairment $ 2,261 $ 1,004