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Note 10 - Mergers and Acquisitions (Details) | Jul. 01, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) | Jun. 29, 2018 USD ($) $ / shares | Mar. 20, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
--- | --- | --- | --- | --- | --- | ---
Assets |  | $ 4,106,882,705 |  |  | $ 3,982,664,773 | $ 3,457,186,695
Deposits |  | 3,298,276,027 |  |  | $ 3,266,655,056 |
Bates Companies [Member] |  |  |  |  |  |
Assets under management |  |  |  | $ 700,000,000 |  |
Voting interests acquired (as a percent) |  |  |  | 100.00% |  |
Cash paid |  |  |  | $ 3,000,000 |  |
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares) | shares |  |  |  | 21,528 |  |
Issuance of shares of common stock as a result of the acquisition, net of issuance cost |  |  |  | $ 1,000,000 |  |
Number of shares expecting to issue based on closing stock price | shares |  |  |  | 64,583 |  |
Springfield Bancshares [Member] |  |  |  |  |  |
Business acquisition exchange ratio | 0.3060 |  |  |  |  |
Cash per common share | $ / shares | $ 1.50 |  |  |  |  |
Common stock consideration |  |  | $ 79,200,000 |  |  |
Share Price | $ / shares |  |  | $ 47.45 |  |  |
Total consideration paid |  |  | $ 87,400,000 |  |  |
Business Combination, Consideration Transferred |  |  | 87,400,000 |  |  |
Proceeds from lines of credit |  | $ 4,900,000 | 4,100,000 |  |  |
Springfield Bancshares [Member] | SFC Bank [Member] |  |  |  |  |  |
Assets | $ 573,000,000 |  |  |  |  |
Loans with book value | 487,000,000 |  |  |  |  |
Deposits | $ 439,000,000 |  |  |  |  |
Springfield Bancshares [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  | $ 10,000,000 |  |  |
Maximum | Bates Companies [Member] |  |  |  |  |  |
Common stock consideration |  |  |  | $ 3,000,000 |  |

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