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Note 5 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Troubled debt, number | 16 | 70
Commercial Real Estate Portfolio Segment [Member] |  |
Troubled debt, number | 5 | 51
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Troubled debt, number | 1 |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |
Troubled debt, number | 1 | 23
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member] |  |
Troubled debt, number | 11 |
Commercial Portfolio Segment [Member] |  |
Troubled debt, number | 11 | 17
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Troubled debt, number |  | 17
Consumer Portfolio Segment [Member] |  |
Troubled debt, number |  | 2
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number |  | 2
Loans, Excluding Acquired Loans [Member] |  |
Troubled debt, number | 40 | 79
Troubled debt, balance | $ 12,938 | $ 14,174
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Troubled debt, number | 29 | 58
Troubled debt, balance | $ 9,549 | $ 12,091
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Troubled debt, number | 1 | 1
Troubled debt, balance | $ 420 | $ 18
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |
Troubled debt, number | 19 | 32
Troubled debt, balance | $ 1,095 | $ 2,245
Loans, Excluding Acquired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number | 9 | 25
Troubled debt, balance | $ 8,034 | $ 9,828
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] |  |
Troubled debt, number | 11 | 20
Troubled debt, balance | $ 3,389 | $ 2,080
Loans, Excluding Acquired Loans [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Troubled debt, number | 11 | 20
Troubled debt, balance | $ 3,389 | $ 2,080
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] |  |
Troubled debt, number |  | 1
Troubled debt, balance |  | $ 3
Loans, Excluding Acquired Loans [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number |  | 1
Troubled debt, balance |  | $ 3
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] |  |
Troubled debt, number | 13 | 41
Troubled debt, balance | $ 7,107 | $ 10,998
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Troubled debt, number | 8 | 26
Troubled debt, balance | $ 4,463 | $ 9,215
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Troubled debt, number |  |
Troubled debt, balance |  |
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |
Troubled debt, number | 4 | 3
Troubled debt, balance | $ 141 | $ 167
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number | 4 | 23
Troubled debt, balance | $ 4,322 | $ 9,048
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |
Troubled debt, number | 5 | 15
Troubled debt, balance | $ 2,644 | $ 1,783
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Troubled debt, number | 5 | 15
Troubled debt, balance | $ 2,644 | $ 1,783
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] |  |
Troubled debt, number |  |
Troubled debt, balance |  |
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number |  |
Troubled debt, balance |  |
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] |  |
Troubled debt, number | 27 | 38
Troubled debt, balance | $ 5,831 | $ 3,176
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Troubled debt, number | 21 | 32
Troubled debt, balance | $ 5,086 | $ 2,876
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Troubled debt, number | 1 | 1
Troubled debt, balance | $ 420 | $ 18
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |
Troubled debt, number | 15 | 29
Troubled debt, balance | $ 954 | $ 2,078
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number | 5 | 2
Troubled debt, balance | $ 3,712 | $ 780
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |
Troubled debt, number | 6 | 5
Troubled debt, balance | $ 745 | $ 297
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Troubled debt, number | 6 | 5
Troubled debt, balance | $ 745 | $ 297
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] |  |
Troubled debt, number |  | 1
Troubled debt, balance |  | $ 3
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Troubled debt, number |  | 1
Troubled debt, balance |  | $ 3

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