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Note 3 - Loans and Allowance for Loan Losses (Details) - TDR Loan Modifications - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings $ 16,053 $ 18,097
Performing Financial Instruments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 12,957 13,840
Nonperforming Financial Instruments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 3,096 4,257
Residential Portfolio Segment [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 1,001 520
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 1,001 520
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 433 457
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Contractual Interest Rate Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 232 244
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 604 627
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 1,996 1,046
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 204 204
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 2,773 7,548
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] | Contractual Interest Rate Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 396 408
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 433 457
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Reduction of Principal and Interest Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 604 627
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Extended Maturity [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 1,996 1,046
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 204 204
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 300 3,535
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Contractual Interest Rate Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 396 408
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Owner Occupied [Member] | Contractual Interest Rate Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 232 244
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Nonowner Occupied [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 2,473 4,013
Commercial Portfolio Segment [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 7,579 6,429
Commercial Portfolio Segment [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 617 395
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Only Payments [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 7,579 6,429
Commercial Portfolio Segment [Member] | Performing Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 226 395
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 391  
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Extended Maturity [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings 218 219
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Loan [Member] | Extended Maturity [Member]    
Financing Receivable, Modifications [Line Items]    
Trouble Debt Restructurings $ 218 $ 219