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Note 8 - Loans (Details) - Impaired Loans and Related Allowance for Credit Losses - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
With no allocated allowance    
Loans with no related allowance, unpaid principal balance $ 140,350 $ 132,395
Loans with no related allowance, recorded investment 107,819 113,167
With allocated allowance    
Loans with related allowance, unpaid principal balance 58,365 78,225
Loans with related allowance, recorded investment 53,303 61,352
Allowance 14,323 11,798
Total impaired loans 198,715 210,620
Total impaired loans 161,122 174,519
Total impaired loans 14,323 11,798
Commercial Portfolio Segment [Member]    
With no allocated allowance    
Loans with no related allowance, unpaid principal balance 15,425 19,479
Loans with no related allowance, recorded investment 14,397 18,452
With allocated allowance    
Loans with related allowance, unpaid principal balance 16,629 7,003
Loans with related allowance, recorded investment 13,233 5,037
Allowance 7,561 1,263
Total impaired loans 7,561 1,263
Real Estate Construction Portfolio Segment [Member]    
With no allocated allowance    
Loans with no related allowance, unpaid principal balance 48,495 32,924
Loans with no related allowance, recorded investment 22,292 17,025
With allocated allowance    
Loans with related allowance, unpaid principal balance   19,006
Loans with related allowance, recorded investment   8,703
Allowance   1,077
Total impaired loans   1,077
Commercial Real Estate Portfolio Segment [Member]    
With no allocated allowance    
Loans with no related allowance, unpaid principal balance 73,980 77,474
Loans with no related allowance, recorded investment 68,680 75,172
With allocated allowance    
Loans with related allowance, unpaid principal balance 27,526 38,197
Loans with related allowance, recorded investment 26,339 34,022
Allowance 6,389 8,993
Total impaired loans 6,389 8,993
Residential Mortgage and Equity Lines Portfolio Segment [Member]    
With no allocated allowance    
Loans with no related allowance, unpaid principal balance 2,450 2,518
Loans with no related allowance, recorded investment 2,450 2,518
With allocated allowance    
Loans with related allowance, unpaid principal balance 14,210 14,019
Loans with related allowance, recorded investment 13,731 13,590
Allowance 373 465
Total impaired loans $ 373 $ 465