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Note 7 - Loans (Detail) - Troubled Debt Restructuring by Type of Concession and Type of Loans (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Principal Deferral [Member] | Commercial Loans Member
   
Accruing TDRs $ 546 $ 12,933
Principal Deferral [Member] | Real Estate Construction Loans [Member]
   
Accruing TDRs 16,820 16,820
Principal Deferral [Member] | Commercial Mortgage Loans [Member]
   
Accruing TDRs 26,882 471
Principal Deferral [Member] | Residential Mortgage Loans [Member]
   
Accruing TDRs 1,287 1,294
Principal Deferral [Member] | Total [Member]
   
Accruing TDRs 45,535 31,518
Rate Reduction [Member] | Commercial Loans Member
   
Accruing TDRs 1,720 1,756
Rate Reduction [Member] | Real Estate Construction Loans [Member]
   
Accruing TDRs 9,581 9,659
Rate Reduction [Member] | Commercial Mortgage Loans [Member]
   
Accruing TDRs 31,602 37,796
Rate Reduction [Member] | Residential Mortgage Loans [Member]
   
Accruing TDRs 1,030 587
Rate Reduction [Member] | Total [Member]
   
Accruing TDRs 43,933 49,798
Rate Reduction and Forgiveness of Principal [Member] | Commercial Mortgage Loans [Member]
   
Accruing TDRs 1,141 2,071
Rate Reduction and Forgiveness of Principal [Member] | Total [Member]
   
Accruing TDRs 1,141 2,071
Rate Reduction and Payment Deferral [Member] | Commercial Loans Member
   
Accruing TDRs 422 431
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member]
   
Accruing TDRs 5,776 5,776
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member]
   
Accruing TDRs 54,427 28,935
Rate Reduction and Payment Deferral [Member] | Residential Mortgage Loans [Member]
   
Accruing TDRs 2,015 1,487
Rate Reduction and Payment Deferral [Member] | Total [Member]
   
Accruing TDRs 62,640 36,629
Total Accruing TDR's [Member] | Commercial Loans Member
   
Accruing TDRs 2,688 15,120
Total Accruing TDR's [Member] | Real Estate Construction Loans [Member]
   
Accruing TDRs 32,177 32,255
Total Accruing TDR's [Member] | Commercial Mortgage Loans [Member]
   
Accruing TDRs 114,052 69,273
Total Accruing TDR's [Member] | Residential Mortgage Loans [Member]
   
Accruing TDRs 4,332 3,368
Total Accruing TDR's [Member] | Total [Member]
   
Accruing TDRs $ 153,249 $ 120,016