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Loans (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due $ 3,115 $ 4,147
Accruing 60-89 Days Past Due 368 896
Accruing Greater Than 90 Days 0 0
Nonaccrual 44,450 28,526
Current 1,154,545 1,174,505
Total Financing Receivables 1,202,478 1,208,074
Construction and Land Development [Member]
    
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due 0 6
Accruing 60-89 Days Past Due 0 215
Accruing Greater Than 90 Days 0 0
Nonaccrual 1,790 2,227
Current 54,423 46,736
Total Financing Receivables 56,213 49,184
Commercial Real Estate [Member]
    
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due 5 836
Accruing 60-89 Days Past Due 0 0
Accruing Greater Than 90 Days 0 0
Nonaccrual 23,416 13,120
Current 450,382 494,397
Total Financing Receivables 473,803 508,353
Residential Real Estate [Member]
    
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due 3,041 2,979
Accruing 60-89 Days Past Due 363 607
Accruing Greater Than 90 Days 0 0
Nonaccrual 18,654 12,555
Current 540,363 530,105
Total Financing Receivables 562,421 546,246
Commercial and Financial [Member]
    
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due 0 80
Accruing 60-89 Days Past Due 0 0
Accruing Greater Than 90 Days 0 0
Nonaccrual 37 16
Current 58,185 53,009
Total Financing Receivables 58,222 53,105
Consumer [Member]
    
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due 69 246
Accruing 60-89 Days Past Due 5 74
Accruing Greater Than 90 Days 0 0
Nonaccrual 553 608
Current 50,937 49,683
Total Financing Receivables 51,564 50,611
Other loans [Member]
    
Contractual aging of the recorded investment in past due loans    
Accruing 30-59 Days Past Due 0 0
Accruing 60-89 Days Past Due 0 0
Accruing Greater Than 90 Days 0 0
Nonaccrual 0 0
Current 255 575
Total Financing Receivables $ 255 $ 575