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Note 2 - Sales/Mergers/Acquisitions - Springfield Bancshares, Inc (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
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Jul. 01, 2018 USD ($) location $ / shares | Jun. 30, 2018 USD ($) | Jun. 29, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Common stock consideration |  |  |  |  | $ 81,637
Total consideration paid |  |  |  |  | $ 94,971
Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Voting interests acquired (as a percent) | 100.00% |  |  |  |
Number of branches | location | 1 |  |  |  |
Business acquisition exchange ratio | 0.3060 |  |  |  |
Cash per common share | $ / shares | $ 1.50 |  |  |  |
Share Price | $ / shares |  |  | $ 47.45 |  |
Common stock consideration | $ 80,637 |  | $ 80,600 |  |
Total consideration paid | $ 88,971 |  | 89,000 |  |
Line of credit facility, current borrowing capacity |  |  | 10,000 |  |
Goodwill, Period Increase |  |  |  | $ 447 |
Other Borrowings | Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from lines of credit |  | $ 4,900 | $ 4,100 |  |

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