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Note 9 - Business Acquisition (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
(In Thousands, Except Per Share Data) |  |  |  |  |  |  |  |
Purchase Price Consideration in Common Stock |  |  |  |  |  |  |  |
Middlefield Banc Corp. shares issued |  |  | 544,610 |  |  |  |  |
Value assigned to Middlefield Banc Corp. common share |  | $ | 38.55 |  |  |  |  |
Purchase price assigned to Liberty Bank common shares exchanged for Middlefield Banc Corp. shares |  |  |  |  |  |  | 20,995 |
Purchase Price Consideration in Cash |  |  |  |  |  |  |  |
Purchase price assigned to Liberty Bank common shares exchanged for cash |  |  |  |  |  |  | 21,173 |
Total Purchase Price |  |  |  |  |  |  | 42,168 |
Previously held equity interest in Liberty Bank |  |  |  |  |  |  | 1,068 |
Net Assets Acquired: |  |  |  |  |  |  |  |
Liberty Bank shareholders equity |  | $ | 30,277 |  |  |  |  |
Adjustments to reflect assets acquired at fair value: |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  |  |
Allowance for loan loss |  |  | 3,257 |  |  |  |  |
Core deposit intangible |  |  | 3,087 |  |  |  |  |
Loans - interest rate |  |  | 578 |  |  |  |  |
Loans - general credit |  |  | (2,161 | ) |  |  |  |
Deferred tax asset |  |  | (1,073 | ) |  |  |  |
Other |  |  | 254 |  |  |  |  |
Adjustments to reflect liabilities acquired at fair value: |  |  |  |  |  |  |  |
Time deposits |  |  | (141 | ) |  |  |  |
Change in control |  |  | (1,718 | ) |  |  |  |
|  |  |  |  |  |  | 32,360 |
Goodwill resulting from merger |  |  |  |  |  | $ | 10,876 |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
(In Thousands) |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | $ | 42,168 |
Previously held equity interest in Liberty Bank |  |  |  |  |  |  | 1,068 |
Assets (liabilities) acquired: |  |  |  |  |  |  |  |
Net assets acquired: |  |  |  |  |  |  |  |
Cash |  |  | 26,604 |  |  |  |  |
Loans and loans held for sale |  |  | 201,341 |  |  |  |  |
Premises and equipment, net |  |  | 325 |  |  |  |  |
Accrued interest receivable |  |  | 440 |  |  |  |  |
Bank-owned life insurance |  |  | 1,681 |  |  |  |  |
Core deposit intangible |  |  | 3,087 |  |  |  |  |
Deferred tax asset |  |  | (1,073 | ) |  |  |  |
Other assets |  |  | 997 |  |  |  |  |
Time deposits |  |  | (30,744 | ) |  |  |  |
Non-time deposits |  |  | (167,300 | ) |  |  |  |
Accrued interest payable |  |  | (47 | ) |  |  |  |
Other liabilities |  |  | (2,951 | ) |  |  |  |
|  |  |  |  |  |  | 32,360 |
Goodwill resulting from the Liberty Bank merger |  |  |  |  |  | $ | 10,876 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Actual from Acquisition Date Through June 30, 2017 |  |  | Actual Second Quarter 2017 |
|  | (in thousands) |  |  | (in thousands) |
Net interest income |  | $ | 5,244 |  |  | $ | 2,509 |
Noninterest income |  |  | 525 |  |  |  | 234 |
Net income |  | $ | 1,302 |  |  | $ | 1,204 |
|  | Pro Formas |  |  | Pro Formas |
|  | Six-month period ended June 30, |  |  | Three-month period ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
|  | (in thousands, except per share data) |  |  | (in thousands, except per share data) |
Net interest income |  | $ | 18,630 |  |  | $ | 17,198 |  |  | $ | 9,575 |  |  | $ | 8,868 |
Noninterest income |  |  | 2,622 |  |  |  | 2,695 |  |  |  | 1,050 |  |  |  | 1,538 |
Net income |  | $ | 2,573 |  |  | $ | 4,513 |  |  | $ | 1,490 |  |  | $ | 2,691 |
Pro forma earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.91 |  |  | $ | 2.30 |  |  | $ | 0.52 |  |  | $ | 1.37 |
Diluted |  | $ | 0.90 |  |  | $ | 2.29 |  |  | $ | 0.52 |  |  | $ | 1.36 |
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] |
Notes Tables |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Remaining | 2017 |  |  | 187 |
| 2018 |  |  | 348 |
| 2019 |  |  | 341 |
| 2020 |  |  | 332 |
| 2021 |  |  | 321 |
| 2022 |  |  | 309 |
| 2023 |  |  | 296 |
| 2024 |  |  | 281 |
| 2025 |  |  | 264 |
| 2026 |  |  | 253 |
|  |  |  | 2,932 |

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