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Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
TDR total $ 414,617 $ 385,764
Loans 414,617 385,764
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR total 136,960 138,377
Loans 136,960 138,377
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR total 100,340 96,669
Loans 100,340 96,669
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR total 50,978 43,831
Loans 50,978 43,831
Nonperforming Financial Instruments [Member]    
TDR accruing 858 742
TDR nonaccrual 106 397
TDR total 964 1,139
TDR related allowance for loan losses
Loans 964 1,139
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
TDR accruing 487 433
TDR nonaccrual 106 229
TDR total 593 662
TDR related allowance for loan losses
Loans 593 662
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
TDR accruing 356 291
TDR nonaccrual 168
TDR total 356 459
TDR related allowance for loan losses
Loans 356 459
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
TDR accruing 15 18
TDR nonaccrual
TDR total 15 18
TDR related allowance for loan losses
Loans $ 15 $ 18