Middlefield Banc (MBCN) 10-K 7 Mar 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 07, 2018	Jun. 30, 2017
Document Information [Line Items]
Entity Registrant Name	Middlefield Banc Corp.
Entity Central Index Key	836,147
Trading Symbol	mbcn
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		3,605,906
Entity Public Float			$ 151.2
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks		$ 39,886	$ 31,395
Federal funds sold			1,100
Cash and cash equivalents		39,886	32,495
Investment securities available for sale, at fair value		95,283	114,376
Loans held for sale		463	634
Loans		923,213	609,140
Less allowance for loan and lease losses		7,190	6,598
Net loans		916,023	602,542
Premises and equipment, net		11,853	11,203
Goodwill		15,071	4,559
Core deposit intangibles		2,749	36
Bank-owned life insurance		15,652	13,540
Other real estate owned		212	934
Accrued interest receivable and other assets		9,144	7,502
TOTAL ASSETS		1,106,336	787,821
LIABILITIES
Noninterest-bearing demand		192,438	133,630
Interest-bearing demand		83,990	59,560
Money market		150,277	74,940
Savings		208,502	172,370
Time		242,987	189,434
Total deposits		878,194	629,934
Short-term borrowings		74,707	68,359
Other borrowings		29,065	9,437
Accrued interest payable and other liabilities		4,507	3,131
TOTAL LIABILITIES		986,473	710,861
STOCKHOLDERS' EQUITY
Common stock, no par value; 10,000,000 shares authorized, 3,603,881 and 2,640,418 shares issued; 3,217,716 and 2,254,253 shares outstanding		84,859	47,943
Retained earnings		47,431	41,334
Accumulated other comprehensive income	[1]	1,091	1,201
Treasury stock, at cost; 386,165 shares		(13,518)	(13,518)
TOTAL STOCKHOLDERS' EQUITY		119,863	76,960
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		$ 1,106,336	$ 787,821
[1]	All amounts are net of tax. Amounts in parentheses indicate debits to accumulated other comprehensive income.

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parentheticals) - $ / shares $ / shares in Thousands	Dec. 31, 2017	Dec. 31, 2016
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	3,603,881	2,640,418
Common stock, shares outstanding (in shares)	3,217,716	2,254,253
Treasury stock, shares (in shares)	386,165	386,165

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INTEREST AND DIVIDEND INCOME
Interest and fees on loans	$ 40,235,000	$ 25,798,000	$ 23,824,000
Interest-bearing deposits in other institutions	328,000	53,000	33,000
Federal funds sold	15,000	20,000	13,000
Investment securities:
Taxable interest	762,000	1,106,000	1,467,000
Tax-exempt interest	2,406,000	2,913,000	3,160,000
Dividends on stock	249,000	104,000	98,000
Total interest and dividend income	43,995,000	29,994,000	28,595,000
INTEREST EXPENSE
Deposits	5,350,000	3,618,000	3,426,000
Short-term borrowings	753,000	322,000	194,000
Other borrowings	544,000	250,000	200,000
Total interest expense	6,647,000	4,190,000	3,820,000
NET INTEREST INCOME	37,348,000	25,804,000	24,775,000
Provision for loan losses	1,045,000	570,000	315,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	36,303,000	25,234,000	24,460,000
NONINTEREST INCOME
Service charges on deposit accounts	1,875,000	1,940,000	1,874,000
Investment securities gains, net	886,000	303,000	323,000
Earnings on bank-owned life insurance	431,000	403,000	624,000
Gain on sale of loans	826,000	419,000	329,000
Other income	841,000	894,000	894,000
Total noninterest income	4,859,000	3,959,000	4,044,000
NONINTEREST EXPENSE
Salaries and employee benefits	13,758,000	10,249,000	9,751,000
Occupancy expense	1,846,000	1,252,000	1,253,000
Equipment expense	1,050,000	991,000	944,000
Data processing costs	1,792,000	1,335,000	1,071,000
Ohio state franchise tax	744,000	632,000	300,000
Federal deposit insurance expense	533,000	438,000	472,000
Professional fees	1,752,000	1,441,000	1,247,000
Net loss (gain) on other real estate owned	30,000	(119,000)	563,000
Advertising expense	821,000	734,000	721,000
Core deposit intangible amortization	374,000	40,000	40,000
Merger expense	1,060,000
Other expense	3,725,000	3,879,000	3,715,000
Total noninterest expense	27,485,000	20,872,000	20,077,000
Income before income taxes	13,677,000	8,321,000	8,427,000
Income taxes	4,222,000	1,905,000	1,562,000
NET INCOME	$ 9,455,000	$ 6,416,000	$ 6,865,000
EARNINGS PER SHARE
Basic (in dollars per share)	$ 3.12	$ 3.04	$ 3.41
Diluted (in dollars per share)	3.10	3.03	3.39
DIVIDENDS DECLARED PER SHARE (in dollars per share)	$ 1.08	$ 1.08	$ 1.07

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income		$ 9,455	$ 6,416	$ 6,865
Other comprehensive loss:
Net unrealized holding gain (loss) on available- for-sale investment securities		719	(1,505)	91
Tax effect		(244)	511	(31)
Reclassification adjustment for investment securities gains included in net income		(886)	(303)	(323)
Tax effect		301	103	110
Total other comprehensive loss	[1]	(110)	(1,194)	(153)
Comprehensive income		$ 9,345	$ 5,222	$ 6,712
[1]	All amounts are net of tax. Amounts in parentheses indicate debits to accumulated other comprehensive income.

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2014	2,242,025
Balance at Dec. 31, 2014	$ 35,529	$ 32,524	$ 2,548	$ (6,734)	$ 63,867
Net income		6,865			6,865
Other comprehensive loss			(153)		(153)
Purchase of treasury stock (196,635 shares)				(6,784)	(6,784)
Dividend reinvestment and purchase plan (in shares)	20,393
Dividend reinvestment and purchase plan	$ 651				651
Stock options exercised (in shares)	400
Stock options exercised	$ (7)				(7)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	585
Stock-based compensation expense	$ 18				18
Cash dividends		(2,153)			(2,153)
Balance (in shares) at Dec. 31, 2015	2,263,403
Balance at Dec. 31, 2015	$ 36,191	37,236	2,395	(13,518)	62,304
Net income		6,416			6,416
Other comprehensive loss			(1,194)		(1,194)
Dividend reinvestment and purchase plan (in shares)	15,300
Dividend reinvestment and purchase plan	$ 519				$ 519
Stock options exercised (in shares)					500
Stock options exercised	$ (6)				$ (6)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	900
Stock-based compensation expense	$ 29				29
Cash dividends		(2,318)			(2,318)
Common stock issuance, net of issuance cost (in shares)	360,815
Common stock issuance, net of issuance cost	$ 11,210				$ 11,210
Balance (in shares) at Dec. 31, 2016	2,640,418				2,254,253
Balance at Dec. 31, 2016	$ 47,943	41,334	1,201	(13,518)	$ 76,960
Net income		9,455			9,455
Other comprehensive loss			(110)		(110)
Dividend reinvestment and purchase plan (in shares)	11,721
Dividend reinvestment and purchase plan	$ 540				$ 540
Stock options exercised (in shares)	7,301				8,237
Stock options exercised	$ 184				$ 184
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	823
Stock-based compensation expense	$ 33				33
Cash dividends		(3,358)			(3,358)
Common stock issuance, net of issuance cost (in shares)	399,008
Common stock issuance, net of issuance cost	$ 15,164				15,164
Common stock issued in business combination (in shares)	544,610
Common stock issued in business combination	$ 20,995				$ 20,995
Balance (in shares) at Dec. 31, 2017	3,603,881				3,217,716
Balance at Dec. 31, 2017	$ 84,859	$ 47,431	$ 1,091	$ (13,518)	$ 119,863

Consolidated Statement of Chan7

Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Treasury Stock [Member]
Purchase of treasury stock (in shares)			196,635
Retained Earnings [Member]
Cash dividends per share (in dollars per share)	$ 1.08	$ 1.08	$ 1.07
Common Stock [Member]
Common stock, issuance cost	$ 760	$ 697
Cash dividends per share (in dollars per share)	$ 1.08	$ 1.08	$ 1.07

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES
Net income	$ 9,455,000	$ 6,416,000	$ 6,865,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,045,000	570,000	315,000
Investment securities gains, net	(886,000)	(303,000)	(323,000)
Depreciation and amortization of premises and equipment, net	1,291,000	1,026,000	973,000
Amortization of premium and discount on investment securities, net	451,000	119,000	669,000
Accretion of deferred loan fees, net	(451,000)	(245,000)	(603,000)
Amortization of core deposit intangibles	374,000	40,000	40,000
Stock-based compensation expense	33,000	29,000	18,000
Origination of loans held for sale	(10,020,000)	(19,736,000)	(17,889,000)
Proceeds from sale of loans	10,482,000	20,628,000	17,549,000
Gain on sale of loans	(291,000)	(419,000)	(329,000)
Origination of student loans held for sale	(365,674,000)
Proceeds from sale of student loans	372,162,000
Gain on sale of student loans	(535,000)
Earnings on bank-owned life insurance	(431,000)	(403,000)	(624,000)
Deferred income taxes	293,000	(93,000)	558,000
Net (gain) loss on other real estate owned	30,000	(119,000)	563,000
Increase in accrued interest receivable	(422,000)	(39,000)	(292,000)
Increase in accrued interest payable	136,000		80,000
Other, net	(3,122,000)	330,000	(388,000)
Net cash provided by operating activities	13,920,000	7,801,000	7,182,000
INVESTING ACTIVITIES
Proceeds from repayments and maturities	14,899,000	23,201,000	13,497,000
Proceeds from sale of securities	6,474,000	9,063,000	15,686,000
Purchases	(3,080,000)	(1,744,000)	(21,946,000)
Increase in loans, net	(119,866,000)	(76,199,000)	(63,937,000)
Proceeds from the sale of other real estate owned	2,196,000	1,607,000	1,762,000
Purchase of bank-owned life insurance			(4,000,000)
Purchase of premises and equipment	(1,201,000)	(2,166,000)	(507,000)
Purchase of restricted stock	(899,000)	(317,000)
Redemption of restricted stock	795,000
Proceeds from bank-owned life insurance		575,000
Acquisition, net of cash paid	5,431,000
Net cash used in investing activities	(95,251,000)	(45,980,000)	(59,445,000)
FINANCING ACTIVITIES
Net increase in deposits	50,216,000	5,487,000	38,335,000
Increase in short-term borrowings, net	6,348,000	32,534,000	21,017,000
Repayment of other borrowings	(10,372,000)	(502,000)	(685,000)
Proceeds from other borrowings	30,000,000
Proceeds from common stock issued	15,164,000	11,210,000
Stock options exercised	184,000	(6,000)	(7,000)
Proceeds from dividend reinvestment and purchase plan	540,000	519,000	651,000
Purchase of treasury stock			(6,784,000)
Cash dividends	(3,358,000)	(2,318,000)	(2,153,000)
Net cash provided by financing activities	88,722,000	46,924,000	50,374,000
Increase (decrease) in cash and cash equivalents	7,391,000	8,745,000	(1,889,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	32,495,000	23,750,000	25,639,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	39,886,000	32,495,000	23,750,000
Cash paid during the year for:
Interest on deposits and borrowings	6,511,000	4,190,000	3,740,000
Income taxes	5,705,000	1,335,000	800,000
Noncash investing transactions:
Loans to facilitate the sale of other real estate owned		63,000
Transfers from loans to other real estate owned	1,179,000	720,000	638,000
Life insurance proceeds not yet received from insurance company			575,000
Common stock issued in business acquisition	20,995,000
Liabilities assumed
Cash and cash equivalents acquired, net	5,431,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
INVESTING ACTIVITIES
Acquisition, net of cash paid	5,431,000
Noncash assets acquired
Loans	195,388,000
Loans held for sale	5,953,000
Premises and equipment, net	325,000
Accrued interest receivable	440,000
Bank-owned life insurance	1,681,000
Core deposit intangible	3,087,000
Other assets	997,000
Goodwill	10,512,000
Total noncash assets acquired	218,383,000
Liabilities assumed
Time deposits	(30,744,000)
Deposits other than time deposits	(167,300,000)
Accrued interest payable	(47,000)
Deferred taxes	(906,000)
Other liabilities	(2,754,000)
Total liabilities assumed	(201,751,000)
Liberty stock acquired in business combination	(1,068,000)
Net noncash assets acquired	15,564,000
Cash and cash equivalents acquired, net	$ 5,431,000

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Significant Accounting Policies [Text Block]	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES A summary of the significant accounting and reporting policies applied in the presentation of the accompanying financial statements follows: Nature of Operations and Basis of Presentation Middlefield Banc Corp. (the “Company”) is an Ohio corporation organized to become the holding company of The Middlefield Banking Company (“MBC”). MBC is a state-c hartered bank located in Ohio. On October 23, 2009, fourteen The consolidated financial statements of the Company include its wholly owned subsidiaries, MBC and EMORECO, Inc. Significant intercompany items have been eliminated in preparing the consolidated financial statements. On January 12, 2017, $37.96 1.1934 ’s common stock in exchange for each share of Liberty common stock they owned immediately prior to the merger. The Company issued 544,610 $42.2 three February, 2017. The financial statements have been pr epared in conformity with U.S. Generally Accepted Accounting Principles. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the balance sheet date and revenues and expenses for the period. Actual results could differ from those estimates. Investment Securities Investment securities are classified at the time of purchase, based on management ’s intention and ability, as securities held to maturity or securities available for sale. Debt securities acquired with the intent and ability to hold to maturity are stated at cost adjusted for amortization of premium and accretion of discount, which are computed using a level yield method and recognized as adjustments of interest income. Certain other debt securities have been classified as available for sale to serve principally as a source of liquidity. Unrealized holding gains and losses for available-for-sale securities are reported as a separate component of stockholders’ equity, net of tax, until realized. Realized security gains and losses are computed using the specific identification method. Interest and dividends on investment securities are recognized as income when earned. Securities are evaluated on at least a quarterly basis and more frequently when economic or market conditions warrant such an evaluation to determine whether a decline in their value is other than temporary. For debt securities, management considers whether the present value of cash flows expected to be collected are less than the security ’s amortized cost basis (the difference defined as the credit loss), the magnitude and duration of the decline, the reasons underlying the decline and the Bank’s intent to sell the security or whether it is more likely than not not not not one not Restricted Stock Common stock of the Federal Home Loan Bank (“FHLB”) represents ownership in an institution that is wholly owned by other financial institutions. This equity security is accounted for at cost and classified with other assets. The FHLB of Cincinnati has reported profits for 2017 2016, not December 31, 2017 2016. Mortgage Banking Activities Mortgage loans originated and intended for sale in the secondary market are carried at fair value. The Bank sells the loans on a servicing retained basis. Servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. The Bank measures servicing assets using the amortization method. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. Loan servicing rights are amortized in proportion to and over the period of estimated net future servicing revenue. The expected period of the estimated net servicing income is based in part on the expected prepayment of the underlying mortgages. The unamortized balance of mortgage servicing rights is included in accrued interest and other assets on the Consolidated Balance Sheet. Mortgage servicing rights are periodically evaluated for impairment. Impairment represents the excess of amortized cost over its estimated fair value. Impairment is determined by stratifying rights into tranches based on predominant risk characteristics, such as interest rate and original time to maturity. Any impairment is reported as a valuation allowance for an individual tranche. If the Company later determines that all or a portion of the impairment no Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of outstanding principal and are recorded as income when earned. The amortization of mortgage servicing rights is netted against loan servicing fee income. Late fees and ancillary fees related to loan servicing are not $50.4 $39.9 December 31, 2017 2016, Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff generally are reported at their outstanding unpaid principal balances net of the allowance for loan and lease losses. Interest income is recognized as income when earned on the accrual method. The accrual of interest is discontinued on a loan when management believes, after considering economic and business conditions, the borrower’s financial condition is such that collection of interest is doubtful. Interest received on nonaccrual loans is recorded as income or applied against principal according to management’s judgment as to the collectability of such principal. Loan origination fees and certain direct loan origination costs are being deferred and the net amount amortized as an adjustment of the related loan’s yield. Management is amortizing these amounts over the contractual life of the related loans. Allowance for Loan and Lease Losses The allowance for loan and lease losses represents the amount which management estimates is adequate to provide for probable loan losses inherent in the loan portfolio. The allowance method is used in providing for loan losses. Accordingly, all loan losses are charged to the allowance, and all recoveries are credited to it. The allowance for loan and lease losses is established through a provision for loan losses which is charged to operations. The provision is based on management’s periodic evaluation of the adequacy of the allowance for loan and lease losses, which encompasses the overall risk characteristics of the various portfolio segments, past experience with losses, the impact of economic conditions on borrowers, and other relevant factors. The estimates used in determining the adequacy of the allowance for loan and lease losses, including the amounts and timing of future cash flows expected on impaired loans, are particularly susceptible to significant change in the near term. A loan is considered impaired when it is probable the borrower will not first one four 90 not not and lease losses is maintained for estimated losses. Cash receipts on impaired loans are applied first Mortgage loans secured by one four ns are large groups of smaller-balance homogeneous loans and are measured for impairment collectively. Management determines the significance of payment delays on a case-by-case basis, taking into consideration all circumstances concerning the loan, the creditworthiness and payment history of the borrower, the length of the payment delay, and the amount of shortfall in relation to the principal and interest owed. Loans Acquired Loans acquired including loans that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no not For purchased loans acquired that are not Premises and Equipment Land is carried at cost. Premises and equipment are stated at cost net of accumulated depreciation. Depreciation is computed on the straight-line method over the estimated useful lives of the assets, which range from 3 20 3 40 Goodwill The Company accounts for goodwill using a three No Intangible Assets Intangible assets include core deposit intangibles, which are a measure of the value of consumer demand and savings deposits acquired in business combinations accounted for as purchases. The core deposit intangibles are being amortized to their estimated residual values over their expected useful lives, commonly of ten Bank-Owned Life Insurance (“BOLI”) The Company owns insurance on the lives of a certain group of key employees. The policies were purchased to help offset the increase in the costs of various fringe benefit plans including healthcare. The cash surrender value of these policies is included as an asset on the Consolidated Balance Sheet and any increases in the cash surrender value are recorded as noninterest income on the Consolidated Statement of Income. In the event of the death of an insured individual under these policies, the Company would receive a death benefit, which would be recorded as noninterest income. Other Real Estate Owned Real estate properties acquired through foreclosure are initially recorded at fair value at the date of foreclosure, establishing a new cost basis. After foreclosure, management periodically performs valuations and the real estate is carried at the lower of cost or fair value less estimated cost to sell. Revenue and expenses from operations of the properties, gains or losses on sales and additions to the valuation allowance are included in operating results. Income Taxes The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are reflected at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. Earnings Per Share The Company provides dua l presentation of basic and diluted earnings per share. Basic earnings per share is calculated utilizing net income as reported in the numerator and average shares outstanding in the denominator. The computation of diluted earnings per share differs in that the dilutive effects of any stock options, warrants, and convertible securities are adjusted in the denominator. Stock-Based Compensation The Company accounts for stock compensation based on the grant date fair value of all share-based payment awards that are expected to vest, including employee share options to be recognized as employee compensation expense over the requisite service period. Compensation cost is recognized for restricted stock units issued to employees based on the fair value of these awards at the date of grant. The market price of the Company ’s common shares at the date of grant is used to estimate the fair value of restricted stock units and stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period, and is recorded in "Salaries" expense. (See Note 14 Cash Flow Information The Company has defined cash and cash equivalents as those amounts included in the Consolidated Balance Sheet captions as “Cash and due from banks” and “Federal funds sold” with original maturities of less than 90 Advertising Costs Advertising costs are expensed as incurred. Reclassification of Comparative Amounts Certain comparative amounts for prior years have been reclassified to conform to current-year presentations. Such reclassifications did not Recent Accounting Pronouncements: In May 2014, 2014 09, December 15, 2016, not not not 606. In August 2015, 2015 14, 606 2014 09 one not 2014 09 December 15, 2017, 2014 09 December 15, 2018, December 15, 2019. In February 2016, 2016 02, 842 A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. A short-term lease is defined as one 12 not may December 15, 2018, December 15, 2019, December 15, 2020. may not 1 In June 2016, 2016 13, ’s current estimate of credit losses that are expected to occur over the remaining life of a financial asset. The income statement will be effected for the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. ASU 2016 13 December 15, 2019, December 15, 2018. first 12 January 1, 2020. In January 2017, 2017 01, 805 not December 15, 2017, December 15, 2018, December 15, 2019. not ’s financial statements. In January 2017, 2017 04, 2 2, ’s fair value; however, the loss recognized should not December 15, 2019. not December 15, 2020. not December 15, 2021. not In March 2017, 2017 08, – Nonrefundable Fees and Other Costs (Subtopic 310 20 not December 15, 2018. December 15, 2019, December 15, 2020. not In May 2017, 2017 09, – Stock Compensation (Topic 718 not not December 15, 2017. 1 not 2 not In February 2018, 2018 02, – Reporting Comprehensive Income (Topic 220 2017 not not not not December 15, 2018. not may

Note 2 - Earnings Per Share

Note 2 - Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Earnings Per Share [Text Block]	2. EARNINGS PER SHARE There are no per share computation for the year ended December 31: 2017 2016 2015 Weighted-average common shares outstanding 3,415,115 2,494,022 2,251,365 Average treasury stock shares (386,165 ) (386,165 ) (236,399 ) Weighted-average common shares and common stock equivalents used to calculate basic earnings per share 3,028,950 2,107,857 2,014,966 Additional common stock equivalents (stock options) used to calculate diluted earnings per share 23,635 11,357 9,154 Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share 3,052,585 2,119,214 2,024,120 Options to purchase 19,750 $17.55 $23.00 December 31, 2017. 14,601 None Options to purchase 29,324 $17.55 37.48 December 31, 2016. 29,324 December 31, 2016, no Options to purchase 31,949 $17.55 $40.24 December 31, 2015. 27,250 December 31, 2015, 4,699

Note 3 - Investment Securities

Note 3 - Investment Securities Available for Sale	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	3. INVESTMENT SECURITIES AVAILABLE FOR SALE The amortized cost , gross gains and losses and fair values of securities available for sale are as follows: December 31, 2017 Gross Gross Amortized Unrealized Unrealized Fair (Dollar amounts in thousands) Cost Gains Losses Value U.S. government agency securities $ 8,664 $ 126 $ (71 ) $ 8,719 Obligations of states and political subdivisions: Taxable 504 8 - 512 Tax-exempt 65,408 1,547 (38 ) 66,917 Mortgage-backed securities in government-sponsored entities 18,640 157 (287 ) 18,510 Total debt securities 93,216 1,838 (396 ) 94,658 Equity securities in financial institutions 415 210 - 625 Total $ 93,631 $ 2,048 $ (396 ) $ 95,283 December 31, 2016 Gross Gross Amortized Unrealized Unrealized Fair (Dollar amounts in thousands) Cost Gains Losses Value U.S. government agency securities $ 10,158 $ 174 $ (96 ) $ 10,236 Obligations of states and political subdivisions: Taxable 1,615 129 (4 ) 1,740 Tax-exempt 78,327 1,678 (522 ) 79,483 Mortgage-backed securities in government-sponsored entities 20,128 202 (261 ) 20,069 Private-label mortgage-backed securities 1,579 130 - 1,709 Total debt securities 111,807 2,313 (883 ) 113,237 Equity securities in financial institutions 750 389 - 1,139 Total $ 112,557 $ 2,702 $ (883 ) $ 114,376 The amortized cost and fair value of debt securities at December 31, 2017, may Amortized Fair (Dollar amounts in thousands) Cost Value Due in one year or less $ 2,340 $ 2,377 Due after one year through five years 9,718 9,878 Due after five years through ten years 10,992 11,012 Due after ten years 70,166 71,391 Total $ 93,216 $ 94,658 Investment securities with an approximate carrying value of $57.9 $60.3 December 31, 2017 2016, Proceeds from the sa les of securities available for sale and the gross realized gains and losses for the years ended December 31, 2017 2015, 2017 2016 2015 Proceeds from sales $ 6,474 $ 9,063 $ 15,686 Gross realized gains 911 * 309 440 Gross realized losses (25 ) (6 ) (117 ) *Prior to the acquisition of Liberty, the Company had a previously held equity interest in Liberty which was re-measured at fair value on the acquisition date and resulted in a gain of $488 ,000, December 31, 2017. The following tables show the Company ’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position. December 31, 2017 Less than Twelve Months Twelve Months or Greater Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized (Dollar amounts in thousands) Value Losses Value Losses Value Losses U.S. government agency securities $ 557 $ (4 ) $ 4,036 $ (67 ) $ 4,593 $ (71 ) Obligations of states and political subdivisions Tax-exempt 1,009 (6 ) 2,784 (32 ) 3,793 (38 ) Mortgage-backed securities in government-sponsored entities 5,698 (71 ) 8,734 (216 ) 14,432 (287 ) Total $ 7,264 $ (81 ) $ 15,554 $ (315 ) $ 22,818 $ (396 ) December 31, 2016 Less than Twelve Months Twelve Months or Greater Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized (Dollar amounts in thousands) Value Losses Value Losses Value Losses U.S. government agency securities $ 3,803 $ (47 ) $ 1,316 $ (49 ) $ 5,119 $ (96 ) Obligations of states and political subdivisions Taxable 502 (4 ) - - 502 (4 ) Tax-exempt 23,554 (522 ) - - 23,554 (522 ) Mortgage-backed securities in government-sponsored entities 9,066 (126 ) 4,438 (135 ) 13,504 (261 ) Total $ 36,925 $ (699 ) $ 5,754 $ (184 ) $ 42,679 $ (883 ) There were 29 December 31, 2017. On a quarterly basis, the Company performs an assessmen t to determine whether there have been any events or economic circumstances indicating that a security with an unrealized loss has suffered other-than-temporary impairment (“OTTI”). A debt security is considered impaired if the fair value is less than its amortized cost basis at the reporting date. The accounting literature requires the Company to assess whether the unrealized loss is other than temporary. For equity securities where the fair value has been significantly below cost for one not The Company has asserted t hat at December 31, 2017 2016, not not may not not Debt securities issued by U.S. government agencies, U.S. government-sponsored enterprises, and state and political subdivisio ns accounted for 99.3% December 31, 2017, no ● The length of time and the extent to which the fair value has been less than the amortized cost basis. ● Changes in the near term prospects of the underlying collateral of a security such as changes in default rates, loss severity given default and significant changes in prepayment assumptions. ● The level of cash flows generated from the underlying collateral supporting the principal and interest payments of the debt securities. ● Any adverse change to the credit conditions and liquidity of the issuer, taking into consideration the latest information available about the overall financial condition of the issuer, credit ratings, recent legislation, and government actions affecting the issuer ’s industry and actions taken by the issuer to deal with the present economic climate.

Note 4 - Loans and Related Allo

Note 4 - Loans and Related Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	4. LOANS AND RELATED ALL OWANCE FOR LOAN AND LEASE LOSSES Major classifications of loans at December 31 2017 2016 Commercial and industrial $ 101,346 $ 60,630 Real estate - construction 47,017 23,709 Real estate - mortgage: Residential 318,157 270,830 Commercial 437,947 249,490 Consumer installment 18,746 4,481 923,213 609,140 Less: Allowance for loan and lease losses (7,190 ) (6,598 ) Net loans $ 916,023 $ 602,542 The amounts above include net deferred loan origination costs of $1.5 $1.7 December 31, 2017 December 31, 2016, The Company ’s primary business activity is with customers located within its local Northeastern Ohio trade area, eastern Geauga County, and contiguous counties to the north, east, and south. The Company also serves the central Ohio market with offices in Dublin, Sunbury and Westerville, Ohio. The Northeastern Ohio trade area includes the newly acquired Liberty locations in Beachwood, Twinsburg, and Solon, Ohio. Commercial, residential, consumer, and agricultural loans are granted. Although the Company has a diversified loan portfolio at December 31, 2017 2016, The following table s summarize the primary segments of the loan portfolio and the allowance for loan and lease losses (in thousands): Real Estate- Mortgage December 31, 2017 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Loans: Individually evaluated for impairment $ 3,627 $ 44 $ 2,824 $ 5,610 $ 4 $ 12,109 Collectively evaluated for impairment 97,719 46,973 315,333 432,337 18,742 911,104 Total loans $ 101,346 $ 47,017 $ 318,157 $ 437,947 $ 18,746 $ 923,213 Real estate- Mortgage December 31, 2016 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Loans: Individually evaluated for impairment $ 1,190 $ 913 $ 3,135 $ 7,187 $ 5 $ 12,430 Collectively evaluated for impairment 59,440 22,796 267,695 242,303 4,476 596,710 Total loans $ 60,630 $ 23,709 $ 270,830 $ 249,490 $ 4,481 $ 609,140 Real Estate- Mortgage December 31, 2017 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Allowance for loan and lease losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 694 $ - $ 140 $ 733 $ - $ 1,567 Collectively evaluated for impairment 305 313 1,620 3,303 82 5,623 Total ending allowance balance $ 999 $ 313 $ 1,760 $ 4,036 $ 82 $ 7,190 Real Estate- Mortgage December 31, 2016 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Allowance for loan and lease losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 90 $ - $ 251 $ 186 $ - $ 527 Collectively evaluated for impairment 358 172 2,567 2,949 25 6,071 Total ending allowance balance $ 448 $ 172 $ 2,818 $ 3,135 $ 25 $ 6,598 The Company ’s loan portfolio is segmented to a level that allows management to monitor risk and performance. The portfolio is segmented into Commercial and Industrial (“C&I”), Real Estate Construction, Real Estate - Mortgage which is further segmented into Residential and Commercial real estate, and Consumer Installment Loans. The C&I loan segment consists of loans made for the purpose of financing the activities of commercial customers. The residential mortgage loan segment consists of loans made for the purpose of financing the activities of residential homeowners. The commercial mortgage loan segment consists of loans made for the purpose of financing the activities of commercial real estate owners and operators. The consumer loan segment consists primarily of installment loans and overdraft lines of credit connected with customer deposit accounts. Management evaluates individual loans in all of the commercial segments for possible impairment based on guidance established by the Board of Directors. Loans are considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in evaluating impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. The Company does not Once the determination has been made that a loan is impaired, the determination of whether a specific allocation of the allowance is necessary is measured by comparing the recorded investment in the loan to the fair value of the loan using one three ’s effective interest rate; (b) the loan’s observable market price; or (c) the fair value of the collateral less selling costs. The method is selected on a loan-by-loan basis, with management primarily utilizing the fair value of collateral method. The evaluation of the need and amount of a specific allocation of the allowance and whether a loan can be removed from impairment status is made on a quarterly basis. The Company’s policy for recognizing interest income on impaired loans does not The following tables present impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not December 31, 2017 Impaired Loans Unpaid Recorded Principal Related Investment Balance Allowance With no related allowance recorded: Commercial and industrial $ 450 $ 1,006 $ - Real estate - construction 44 44 - Real estate - mortgage: Residential 1,685 1,904 - Commercial 1,870 1,984 - Consumer installment 4 4 - Total $ 4,053 $ 4,942 $ - With an allowance recorded: Commercial and industrial $ 3,177 $ 3,888 $ 694 Real estate - mortgage: Residential 1,139 1,179 140 Commercial 3,740 3,913 733 Total $ 8,056 $ 8,980 $ 1,567 Total: Commercial and industrial $ 3,627 $ 4,894 $ 694 Real estate - construction 44 44 - Real estate - mortgage: Residential 2,824 3,083 140 Commercial 5,610 5,897 733 Consumer installment 4 4 - Total $ 12,109 $ 13,922 $ 1,567 December 31, 2016 Impaired Loans Unpaid Recorded Principal Related Investment Balance Allowance With no related allowance recorded: Commercial and industrial $ 319 $ 318 $ - Real estate - construction 913 909 - Real estate - mortgage: Residential 2,142 2,140 - Commercial 2,031 2,027 - Total $ 5,405 $ 5,394 $ - With an allowance recorded: Commercial and industrial $ 871 $ 868 $ 90 Real estate - mortgage: Residential 993 991 251 Commercial 5,156 5,147 186 Consumer installment 5 5 - Total $ 7,025 $ 7,011 $ 527 Total: Commercial and industrial $ 1,190 $ 1,186 $ 90 Real estate - construction 913 909 - Real estate - mortgage: Residential 3,135 3,131 251 Commercial 7,187 7,174 186 Consumer installment 5 5 - Total $ 12,430 $ 12,405 $ 527 The table s above include troubled debt restructuring totaling $5.4 $6.7 December 31, 2017 2016, The following table presents interest income by class, recognized on impaired loans (in thousands): As of December 31, 2017 As of December 31, 2016 As of December 31, 2015 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Commercial and industrial $ 2,378 $ 178 $ 1,211 $ 32 $ 1,468 $ 100 Real estate - construction 565 1 1,281 10 2,407 115 Real estate - mortgage: Residential 3,068 89 3,529 98 4,356 160 Commercial 6,820 446 7,384 368 5,203 350 Consumer installment 5 1 6 1 6 - Total $ 12,836 $ 715 $ 13,411 $ 509 $ 13,440 $ 725 Troubled Debt Restructuring (TDR) describes loans on which the bank has granted concessions for reasons related to the customer ’s financial difficulties. Such concessions may one ● reduction in the interest rate to below market rates ● extension of repayment requirements beyond normal terms ● reduction of the principal amount owed ● reduction of accrued interest due ● acceptance of other assets in full or partial payment of a debt In each case the concession is made due to deterioration in the borrower ’s financial condition, and the new terms are less stringent than those required on a new loan with similar risk. The total impact on the ALLL for 2017 2016 $509,000 $436,000, The following tables present the number of loan modifications by class , the corresponding recorded investment, and the subsequently defaulted modifications (in thousands): December 31, 2017 Number of Contracts Pre-Modification Post-Modification Term Outstanding Recorded Outstanding Recorded Troubled Debt Restructurings Modification Other Total Investment Investment Commercial and industrial 4 - 4 $ 127 $ 127 Residential real estate 5 - 5 256 256 December 31, 2016 Number of Contracts Pre-Modification Post-Modification Term Outstanding Recorded Outstanding Recorded Troubled Debt Restructurings Modification Other Total Investment Investment Commercial and industrial 5 - 5 $ 610 $ 610 Residential real estate 4 - 4 166 166 Commercial real estate 1 - 1 311 311 December 31, 2015 Number of Contracts Pre-Modification Post-Modification Term Outstanding Recorded Outstanding Recorded Troubled Debt Restructurings Modification Other Total Investment Investment Commercial and industrial 6 - 6 $ 434 $ 434 Real estate construction 1 - 1 181 181 Residential real estate 5 1 6 515 535 Commercial real estate 1 - 1 270 270 December 31, 2016 Number of Recorded Troubled Debt Restructurings subsequently defaulted Contracts Investment Commercial and industrial 2 $ 7 Real estate construction 1 - Residential real estate 4 278 Commercial real estate 1 119 December 31, 2015 Number of Recorded Troubled Debt Restructurings subsequently defaulted Contracts Investment Commercial and industrial 2 $ 14 Real estate construction 1 130 There were no lts of troubled debt restructurings for the year ended December 31, 2017. Management uses a nine first five not iticized and are aggregated as Pass rated. The criticized rating categories utilized by management generally follow bank regulatory definitions. The Special Mention category includes assets that are currently protected but are potentially weak, resulting in an undue and unwarranted credit risk, but not not 90 To help ensure that risk ratings are accurate and reflect the present and future capacity of borrowers to repay a loan as agreed, the Company has a structured loan-rating process with several layers of internal and external oversight. Generally, consumer and residential mortgage loans are included in the Pass categories unless a specific action, such as bankruptcy, repossession, or death, occurs to raise awareness of a possible credit event. The Company’s Commercial Loan Officers are responsible for the timely and accurate risk rating of the loans in their portfolios at origination and on an ongoing basis with the Chief Credit Officer ultimately responsible for accurate and timely risk ratings. The Credit Department performs an annual review of all commercial relationships $1.0 $250,000 $125,000. The following table s present the classes of the loan portfolio summarized by the aggregate Pass rating and the criticized categories of Special Mention, Substandard, and Doubtful within the internal risk rating system (in thousands): December 31, 2017 Special Total Pass Mention Substandard Doubtful Loans Commercial and industrial $ 95,621 $ 1,942 $ 3,783 $ - $ 101,346 Real estate - construction 46,995 - 22 - 47,017 Real estate - mortgage: Residential 312,176 723 5,258 - 318,157 Commercial 424,225 9,164 4,558 - 437,947 Consumer installment 18,742 - 4 - 18,746 Total $ 897,759 $ 11,829 $ 13,625 $ - $ 923,213 December 31, 2016 Special Total Pass Mention Substandard Doubtful Loans Commercial and industrial $ 58,539 $ 663 $ 1,428 $ - $ 60,630 Real estate - construction 23,541 144 24 - 23,709 Real estate - mortgage: Residential 264,481 428 5,921 - 270,830 Commercial 240,678 4,422 4,390 - 249,490 Consumer installment 4,467 - 14 - 4,481 Total $ 591,706 $ 5,657 $ 11,777 $ - $ 609,140 Management further monitors the performance and credit quality of the loan portfolio by analyzing the age of the portfolio as determined by the length of time a recorded payment is past due. The following table s present the classes of the loan portfolio summarized by the aging categories of loans and nonaccrual loans (in thousands): December 31, 2017 30-59 Days 60-89 Days 90 Days+ Total Total Current Past Due Past Due Past Due Past Due Loans Commercial and industrial $ 99,633 $ 1,607 $ 29 $ 77 $ 1,713 $ 101,346 Real estate - construction 47,017 - - - - 47,017 Real estate - mortgage: Residential 314,866 1,977 227 1,087 3,291 318,157 Commercial 434,879 1,907 1 1,160 3,068 437,947 Consumer installment 18,736 10 - - 10 18,746 Total $ 915,131 $ 5,501 $ 257 $ 2,324 $ 8,082 $ 923,213 December 31, 2016 30-59 Days 60-89 Days 90 Days+ Total Total Current Past Due Past Due Past Due Past Due Loans Commercial and industrial $ 60,407 $ 17 $ 2 $ 204 $ 223 $ 60,630 Real estate - construction 23,709 - - - - 23,709 Real estate - mortgage: Residential 268,041 1,909 207 673 2,789 270,830 Commercial 249,081 92 - 317 409 249,490 Consumer installment 4,465 - 10 6 16 4,481 Total $ 605,703 $ 2,018 $ 219 $ 1,200 $ 3,437 $ 609,140 The following tables present the classes of the l oan portfolio summarized by nonaccrual loans and loans 90 December 31, 2017 90+ Days Past Nonaccrual Due and Accruing Commercial and industrial $ 1,120 $ - Real estate - construction - - Real estate - mortgage: Residential 4,002 - Commercial 3,311 - Consumer installment - - Total $ 8,433 $ - December 31, 2016 90+ Days Past Nonaccrual Due and Accruing Commercial and industrial $ 454 $ - Real estate - construction - - Real estate - mortgage: Residential 4,034 - Commercial 1,409 - Consumer installment 6 - Total $ 5,903 $ - Interest income that would have been recorded had these loans not status was $437,000 2017, $309,000 2016, $259,000 2015. An allowance for loan and lease losses (“ALLL”) is maintained to absorb losses from the loan portfolio. The ALLL is based on management’s continuing evaluation of the risk characteristics and credit quality of the loan portfolio, assessment of current economic conditions, diversification and size of the portfolio, adequacy of collateral, past and anticipated loss experience, and the amount of nonperforming loans. The Company ’s methodology for determining the ALLL is based on the requirements of ASC Section 310 10 35 450 20 two may Loans that are collectively evaluated for impairment are analyzed, with general allowances being made as appropriate. For general allowances, historical loss trends are used in the estimation of losses in the current portfolio. These historical loss amounts are modified by other qualitative factors. The classes described above, which are based on the purpose code assigned to each loan, provide the starting point for the ALLL analysis. Management tracks the historical net charge-off activity at the purpose code level. A historical charge-off factor is calculated utilizing the last twelve Management has identified a number of additional qualitative factors which it uses to supplement the historical charge-off factor, because these factors are likely to cause estimated credit losses associated with the existing loan pools to differ from historical loss experience. The additional factors that are evaluated quarterly and updated using information obtained from internal, regulatory, and governmental sources are: national and local economic trends and conditions; levels of and trends in delinquency rates and nonaccrual loans; trends in volumes and terms of loans; effects of changes in lending policies; experience, ability, and depth of lending staff; value of underlying collateral; and concentrations of credit from a loan type, industry, and/or geographic standpoint. Management reviews the loan portfolio on a quarterly basis using a defined, consistently applied process in order to make appropriate and timely adjustments to the ALLL. When information confirms all or part of specific loans to be uncollectible, these amounts are promptly charged off against the ALLL. The following tables summarize the primary segments of the loan portfolio (in thousands): Commercial and industrial Real estate- construction Real estate- residential mortgage Real estate- commercial mortgage Consumer installment Total ALLL balance at December 31, 2016 $ 448 $ 172 $ 2,818 $ 3,135 $ 25 $ 6,598 Charge-offs (536 ) - (117 ) (39 ) (462 ) (1,154 ) Recoveries 234 34 241 111 81 701 Provision 853 107 (1,182 ) 829 438 1,045 ALLL balance at December 31, 2017 $ 999 $ 313 $ 1,760 $ 4,036 $ 82 $ 7,190 Commercial and industrial Real estate- construction Real estate- residential mortgage Real estate- commercial mortgage Consumer installment Total ALLL balance at December 31, 2015 $ 867 $ 276 $ 3,139 $ 2,078 $ 25 $ 6,385 Charge-offs (237 ) - (414 ) (70 ) (22 ) (743 ) Recoveries 90 - 141 140 15 386 Provision (272 ) (104 ) (48 ) 987 7 570 ALLL balance at December 31, 2016 $ 448 $ 172 $ 2,818 $ 3,135 $ 25 $ 6,598 The negative provision allocated to residential real estate loans in the amount of $1.2 December 31, 2017 2017

Note 5 - Other Real Estate Owne

Note 5 - Other Real Estate Owned ("OREO")	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Real Estate Owned [Text Block]	5. OTHER REAL ESTATE OWNED (“OREO”) OREO comprises foreclosed assets acquired in settlement of loans and is carried at fair value less estimated cost to sell and is included in other real estate owned on the Consolidated Balance Sheet. As of December 31, 2017 December 31, 2016, $212,000 $934,000, $1.5 December 31, 2017.

Note 6 - Premises and Equipment

Note 6 - Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	6. PREMISES AND EQUIPMENT Major classifications of premises and equipment at December 31: (Dollar amounts in thousands) 2017 2016 Land and land improvements $ 2,920 $ 2,891 Building and leasehold improvements 14,277 12,081 Furniture, fixtures, and equipment 7,010 5,404 Total premises and equipment 24,207 20,376 Less accumulated depreciation and amortization 12,354 9,173 Total premises and equipment, net $ 11,853 $ 11,203 Depreciation expense charged to operations was $876,000 2017, $735,000 2016, $715,000 2015.

Note 7 - Goodwill and Intangibl

Note 7 - Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	7. GOODWILL AND INTANGIBLE ASSETS Goodwill total ed $15.1 $4.6 December 31, 2017, 2016. $2.7 $36,000 December 31, 2017, 2016, $692,000 $318,000 December 31, 2017, 2016. Core deposit intangible assets are amortized to their estimated residual values over their expected useful lives, commonly of ten $374,000, $40,000, $40,000 2017, 2016, 2015, December 31, 2017 2018 $ 352 2019 341 2020 332 2021 321 2022 309 Thereafter 1,094 Total $ 2,749

Note 8 - Other Assets

Note 8 - Other Assets	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Other Assets Disclosure [Text Block]	8. OTHER ASSETS The components of other assets at the years ended December 31: (Dollar amounts in thousands) 2017 2016 Restricted stock $ 3,589 $ 2,204 Accrued interest receivable on investment securities 707 812 Accrued interest receivable on loans 2,581 1,614 Deferred tax asset, net 647 1,607 Other 1,620 1,265 Total $ 9,144 $ 7,502

Note 9 - Deposits

Note 9 - Deposits	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Deposit Liabilities Disclosures [Text Block]	9. DEPOSITS Time deposits at December 31, 2017, $99.3 $21.5 $51.8 $41.0 $29.4 2018, 2019, 2020, 2021, 2022, The aggregate of all time deposit accounts of $ 250,000 $39.4 $27.8 December 31, 2017 2016,

Note 10 - Short-term Borrowings

Note 10 - Short-term Borrowings	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Short-term Debt [Text Block]	10. SHORT-TERM BORROWINGS For t he year ended December 31, (Dollar amounts in thousands) 2017 2016 Balance at year-end $ 74,707 $ 68,359 Average balance outstanding 63,910 37,130 Maximum month-end balance 114,025 68,359 Weighted-average rate at year-end 1.36 % 0.61 % Weighted-average rate during the year 1.18 % 0.89 % Average balances outstanding during the year represent daily average balances, and average interest rates represent interest expense divided by the related average balance. The Company maintains a $ 6.0 4.75%, $10.0 4.69%, $4.0 4.74%. December 31, 2017, 2016, 2015, $0, $0, $9.5 The following table provides additional detail regarding collateral pledged to secure the Company’s repurchase agreements: Repurchase Agreements (Sweep) Accounted for as Secured Borrowings (Dollar amounts in thousands) Overnight and Continuous December 31, 2017 December 31, 2016 Repurchase agreements secured by: Mortgage-backed securities in government sponsored entities $ 2,040 $ 2,667 Tax-exempt obligations of states and political subdivisions 495 968 Gross amount of pledged collateral 2,535 3,635 Gross amount of recognized liabilities $ 1,989 $ 2,129

Note 11 - Other Borrowings

Note 11 - Other Borrowings	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Other Borrowings [Text Block]	11. OTHER BORROWINGS Other borrowings consist of advances from the FHLB and subordinated debt as follows: Weighted- Stated interest (Dollar amounts in thousands) Maturity range average rate range Description from to interest rate from to 2017 2016 Fixed-rate amortizing 02/01/18 10/01/28 1.24 % 1.01 % 4.47 % $ 20,817 $ 1,189 Junior subordinated debt 12/21/37 12/21/37 2.85 % 2.56 % 3.05 % 8,248 8,248 Total $ 29,065 $ 9,437 The scheduled maturities of other borrowings are as follows: (Dollar amounts in thousands) Weighted- Year Ending December 31, Amount Average Rate 2018 $ 20,252 1.16 % 2019 155 4.04 % 2020 116 4.04 % 2021 87 4.04 % 2022 65 4.04 % Beyond 2022 8,390 2.79 % Total $ 29,065 2.86 % Fixed- rate amortizing advances from the FHLB require monthly principal and interest payments and an annual 20 20 first $192.2 December 31, 2017. T he Company formed a special purpose entity (“Entity”) to issue $8.0 $248,000 1.67%. may December 2006 $8.3

Note 12 - Other Liabilities

Note 12 - Other Liabilities	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Other Liabilities Disclosure [Text Block]	12. OTHER LIABILITIES The components of other liabilities are as follows at December 31: 2017 2016 (Dollar amounts in thousands) Accrued interest payable $ 578 $ 395 Supplemental Executive Retirement Plan 1,427 1,125 Accrued salary expense 956 768 Other 1,546 843 Total $ 4,507 $ 3,131

Note 13 - Income Taxes

Note 13 - Income Taxes	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	13. INCOME TAXES The provision for federal income taxes for the years ended December 31, (Dollar amounts in thousands) 2017 2016 2015 Current payable $ 3,929 $ 1,998 $ 1,004 Deferred 293 (93 ) 558 Total provision $ 4,222 $ 1,905 $ 1,562 The tax effects of deductible and taxable temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows at December 31,: (Dollar amounts in thousands) 2017 2016 Deferred tax assets: Allowance for loan and lease losses $ 1,210 $ 2,243 Supplemental retirement plan 528 382 Investment security basis adjustment 18 66 Nonaccrual interest income 371 456 OREO adjustments 2 26 Accrued compensation 201 261 Other 86 82 Gross deferred tax assets 2,416 3,516 Deferred tax liabilities: Premises and equipment 356 445 Net unrealized gain on securities 347 618 FHLB stock dividends 139 225 Intangibles 307 449 Mortgage servicing rights 71 103 Deferred origination fees, net 294 63 Acquisition fair value adjustments 250 1 Other 5 5 Gross deferred tax liabilities 1,769 1,909 Net deferred tax assets $ 647 $ 1,607 No December 31, 2017 2016, The reconciliation between the federal statutory rate and the Company ’s effective consolidated income tax rate for the years ended December 31, (Dollar amounts in thousands) 2017 2016 2015 % of % of % of Pretax Pretax Pretax Amount Income Amount Income Amount Income Provision at statutory rate $ 4,651 34.0 % $ 2,829 34.0 % $ 2,866 34.0 % Tax-exempt income (1,045 ) (7.6 )% (1,177 ) (14.1 )% (1,347 ) (15.9 )% Nondeductible interest expense 32 0.2 % 32 0.4 % 34 0.4 % Nondeductible merger-related expense 43 0.3 % 186 2.2 % - - % Stock-based compensation (50 ) (0.4 )% - - % - - % Change in effective corporate tax rate 401 2.9 % - - % - - % Other 190 1.5 % 35 0.4 % 9 - % Actual tax expense and effective rate $ 4,222 30.9 % $ 1,905 22.9 % $ 1,562 18.5 % ASC 740 ‐ 10 not ‐ likely ‐ than ‐ not 50 ‐ likely ‐ than ‐ not first no ‐ likely ‐ than ‐ not first no On December 22, 201 7, H.R.1, 34% 21% January 1, 2018. 2017 $401,000. Also on December 22, 2017, No. 118 118” views in practice in accounting for the income tax effects of the Act in situations where a registrant does not 118 not one We recorded provisional amounts of deferred income taxes using reasonable estimates in one not prepared, or analyzed. Our deferred tax liability for temporary differences between the tax and financial reporting bases of fixed assets principally due to the accelerated depreciation under the Act which allows for full expensing of qualified property purchased and placed in service after September 27, 2017. not December 22, 2018. A t December 31, 2017 December 31, 2016, no 740 10 not 12 The Company and the Bank are subject to U.S. federal income tax as well as an income tax in the state of Ohio, and the Bank is subject to a capital ‐ based franchise tax in the state of Ohio. The Company and the Bank are no December 31, 2014.

Note 14 - Employee Benefits

Note 14 - Employee Benefits	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	14. E MPLOYEE BENEFITS Retirement Plan The Bank maintain s section 401 21 50% 6% December 31, 2017. six second 20% 3 2017, 2016, 2015 $258,000, $156,000, $156,000, Supplemental Retirement Plan Until 2001, MBC maintained a Directors’ Retirement Plan to provide postretirement payments over a ten five 25% three The following table illustrates the components of the projected payments for the Directors’ Retirement Plan for the years ended: Projected Payments 2018 $ 18,000 2019 12,000 2020 10,000 2021 2,000 Total $ 42,000 The retirement plan is available solely for nonemployee directors of M BC, but MBC has not 2001. Executive Deferred Compensation Plan The Company maintains an Executive Deferred Compensation Plan (the “Plan”) to provide post-retirement payments to members of senior man agement. The Plan agreements are noncontributory, defined contribution arrangements that provide supplemental retirement income benefits to several officers, with contributions made solely by the Bank. During 2017, 2016, 2015, $110,000, $99,000, $65,000, Stock Opt ion and Restricted Stock Plan In 2007 , the Company adopted the 2007 “2007 160,000 2007 ten 2007 2017, 92,759 2007 not In 2017 , the Company adopted the 2017 “2017 2017 May 10, 2017. 224,000 2017 ten not 218,175 December 31, 2017. The following table presents share data related to the outstanding options: 2017 Weighted Average Exercise Price Per Share Outstanding, January 1 29,324 $ 23.67 Expired (1,337 ) 37.48 Exercised (8,237 ) 27.97 Outstanding, December 31 19,750 $ 20.94 Exercisable, December 31 19,750 $ 20.94 The total intrinsic value of outstanding in-the-money exercisable stock options was $538,000 December 31, 2017. The following table summarizes the characteristics of stock options at December 31, 2017: Outstanding Exercisable Grant Date Exercise Price Per Share Shares Contractual Average Life Average Exercise Price Per Share Shares Average Exercise Price Per Share November 10, 2008 $ 23.00 12,300 0.85 $ 23.00 12,300 $ 23.00 May 9, 2011 $ 17.55 7,450 3.35 $ 17.55 7,450 $ 17.55 19,750 19,750 N were granted for the years ended December 31, 2017 2016. For each of the years ended December 31, 2017, 2016, 2015, no December 31, 2017, no For the years ended December 31, 2017 2016, 8,237 500 $95,000 $6,000, respectively. During 2017, 2016, 2015, 5,825, 5,090, 3,905, $196,000, $123,000, $55,000 2017, 2016, 2015, third three 8.00%. The following table presents the activity during 2017 Units Weighted Average Grant Date Fair Value Per Share Nonvested at January 1, 2017 8,995 $ 32.93 Granted 5,825 $ 38.70 Forfeited (219 ) $ 38.70 Nonvested at December 31, 2017 14,601 $ 35.14 Expected to vest at December 31, 2017 14,601 $ 35.14

Note 15 - Commitments

Note 15 - Commitments	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	15. COMMITMENTS In the normal course of business, there are various outstanding commitments and certain contingent liabilities which are not at December 31: (Dollar amounts in thousands) 2017 2016 Commitments to extend credit $ 234,023 $ 161,646 Standby letters of credit 1,015 1,416 Total $ 235,038 $ 163,062 These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Balance Sheet. The Company ’s exposure to credit loss, in the event of nonperformance by the other parties to the financial instruments, is represented by the contractual amounts as disclosed. The Company minimizes its exposure to credit loss under these commitments by subjecting them to credit approval and review procedures and collateral requirements as deemed necessary. Commitments generally have fixed expiration dates within one Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third third one Leasing Arrangements The Company leases certain of its banking facilities under operating leases which contain certain renewal options. As of December 31, 2017, 2018 $ 655 2019 639 2020 641 2021 598 2022 365 Thereafter 920 Total $ 3,818 The above amounts represent minimum rentals not escalation provisions and assume that all renewal option periods will be exercised by the Company. Rent expense approximated $641,000, $285,000, $288,000 December 31, 2017, 2016, 2015,

Note 16 - Regulatory Restrictio

Note 16 - Regulatory Restrictions	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Banking and Thrift Disclosure [Text Block]	16. REGULATORY R ESTRICTIONS The Company is subject to the regulatory requirements of the Federal Reserve System as a bank holding company. The bank is subject to regulations of the Federal Deposit Insurance Corporation (“FDIC”) and the State of Ohio, Division of Financial Institutions. Cash Requirements The Federal Reserve Bank of Cleveland requires the Company to maintain certain average reserve balances. As of December 31, 2017 2016, $15.8 $2.9 Loans Federal law prevents the Company from borrowing from the Bank unless the loans are secured by specific obligations. Further, such secured loans are limited in amount of 10 % of the Bank’s common stock and capital surplus. Dividends MBC is subject to dividend restrictions that generally limit the amount of dividends that can be paid by an Ohio state-chartered bank. Under the Ohio Banking Code, cash dividends may not two 2017 $5.1 2018 second January 12, 2019,

Note 17 - Regulatory Capital

Note 17 - Regulatory Capital	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Regulatory Capital Requirements under Banking Regulations [Text Block]	17. REGULATORY CAPITAL The Bank and Company are subject to regulatory capital requirements administered by banking agencies. Capital adequacy guidelines and prompt corrective-action regulations involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weightings, and other factors and the regulators can lower classifications in certain cases. Failure to meet various capital requirements can initiate regulatory action that could have a direct material effect on the financial stateme nts. As of December 31, 2017, The prompt corrective action regulations provide five not an institution is adequately capitalized, regulatory approval is required before the institution may The Basel III Capital Rules became effective for the Bank on January 1, 2015 began January 1, 2016 0.625% four January 1, 2.5% January 1, 2019). 1 The following tables present actual and required capital ratios as of December 31, 2017 2016, As of December 31, 2017 Tier 1 Risk Common Total Risk Leverage Based Equity Tier 1 Based The Middlefield Banking Company 9.47 % 10.88 % 10.88 % 11.64 % Middlefield Banc Corp. 10.20 % 11.64 % 10.79 % 12.41 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus fully phased-in capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (Bank only) 5.00 % 8.00 % 6.50 % 10.00 % As of December 31, 2016 Tier 1 Risk Common Total Risk Leverage Based Equity Tier 1 Based The Middlefield Banking Company 9.29 % 13.03 % 13.03 % 14.25 % Middlefield Banc Corp. 9.27 % 13.07 % 13.07 % 15.75 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus fully phased-in capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (Bank only) 5.00 % 8.00 % 6.50 % 10.00 %

Note 18 - Fair Value Disclosure

Note 18 - Fair Value Disclosure Measurements	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Fair Value Disclosures [Text Block]	18. FAIR VALUE DISCLOSURE MEASUREMENTS The following disclosures show the hierarchal disclosure framework associated with the level of pricing observations utilized in measuring assets and liabilities at fair value. The three Level I: Quoted prices are available in active markets for identical assets or liabilities as of the reported date. Level II: Pricing inputs are other than the quoted prices in active markets, which are either directly or indirectly observable as of the reported date. The nature of these assets and liabilities includes items for which quoted prices are available but traded less frequently and items that are fair-valued using other financial instruments, the parameters of which can be directly observed. Level III: Valuations derived from valuation techniques in which one This hierarchy requires the use of observable market data when available. The following table s present the assets measured on a recurring basis on the Consolidated Balance Sheet at their fair value by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. December 31, 2017 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a recurring basis: U.S. government agency securities $ - $ 8,719 $ - $ 8,719 Obligations of states and political subdivisions - 67,429 - 67,429 Mortgage-backed securities in government- sponsored entities - 18,510 - 18,510 Total debt securities - 94,658 - 94,658 Equity securities in financial institutions - 625 - 625 Total $ - $ 95,283 $ - $ 95,283 December 31, 2016 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a recurring basis: U.S. government agency securities $ - $ 10,236 $ - $ 10,236 Obligations of states and political subdivisions - 81,223 - 81,223 Mortgage-backed securities in government- sponsored entities - 20,069 - 20,069 Private-label mortgage-backed securities - 1,709 - 1,709 Total debt securities - 113,237 - 113,237 Equity securities in financial institutions - 1,139 - 1,139 Total $ - $ 114,376 $ - $ 114,376 Financial instruments are considered Level III when their values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one The following tables present the assets measured on a non -recurring basis on the Consolidated Balance Sheet at their fair value by level within the fair value hierarchy. Impaired loans that are collateral dependent are written down to fair value through the establishment of specific reserves. Techniques used to value the collateral that secure the impaired loan include quoted market prices for identical assets classified as Level I inputs and observable inputs, employed by certified appraisers, for similar assets classified as Level II inputs. In cases where valuation techniques included inputs that are unobservable and are based on estimates and assumptions developed by management based on the best information available under each circumstance, the asset valuation is classified as Level III inputs. December 31, 2017 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a non-recurring basis: Impaired loans $ - $ - $ 3,072 $ 3,072 Other real estate owned - - 32 32 December 31, 2016 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a non-recurring basis: Impaired loans $ - $ - $ 6,498 $ 6,498 Other real estate owned - - 511 511 The following table s present additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company uses Level III inputs to determine fair value: Quantitative Information about Level III Fair Value Measurements (Dollar amounts in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted Average) December 31, 2017 Impaired loans $ 3,072 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 86.1% (13.8%) Other real estate owned $ 32 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 10.0% Quantitative Information about Level III Fair Value Measurements (Dollar amounts in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted Average) December 31, 2016 Impaired loans $ 4,928 Discounted cash flow Discount rate 3.1% to 7.0% (5.1%) $ 1,570 Appraisal of collateral (1) Appraisal adjustment (2) 0.0% to 59.7% (28.2%) Other real estate owned $ 511 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 10.0% ( 1 Fair value is generally determined through independent appraisals of the underlying collateral, which g enerally include various level III inputs which are not ( 2 Appraisals may The estimated fair value of the Company ’s financial instruments is as follows: December 31, 2017 Carrying Total Value Level I Level II Level III Fair Value (in thousands) Financial assets: Cash and cash equivalents $ 39,886 $ 39,886 $ - $ - $ 39,886 Investment securities available for sale 95,283 - 95,283 - 95,283 Loans held for sale 463 - 463 - 463 Net loans 916,023 - - 913,323 913,323 Bank-owned life insurance 15,652 15,652 - - 15,652 Federal Home Loan Bank stock 3,589 3,589 - - 3,589 Accrued interest receivable 3,288 3,288 - - 3,288 Financial liabilities: Deposits $ 878,194 $ 635,207 $ - $ 242,020 $ 877,227 Short-term borrowings 74,707 74,707 - - 74,707 Other borrowings 29,065 - - 29,069 29,069 Accrued interest payable 578 578 - - 578 December 31, 2016 Carrying Total Value Level I Level II Level III Fair Value (in thousands) Financial assets: Cash and cash equivalents $ 32,495 $ 32,495 $ - $ - $ 32,495 Investment securities available for sale 114,376 - 114,376 - 114,376 Loans held for sale 634 - 634 - 634 Net loans 602,542 - - 604,447 604,447 Bank-owned life insurance 13,540 13,540 - - 13,540 Restricted stock 2,204 2,204 - - 2,204 Accrued interest receivable 2,426 2,426 - - 2,426 Financial liabilities: Deposits $ 629,934 $ 440,500 $ - $ 189,871 $ 630,371 Short-term borrowings 68,359 68,359 - - 68,359 Other borrowings 9,437 - - 9,512 9,512 Accrued interest payable 395 395 - - 395 Financial instruments are defined as cash, evidence of ownership interest in an entity, or a contract which creates an obligation or right to receive or deliver cash or another financial instrument from/to a second Fair value is defined as the amount at which a financial instrument could be exchanged in a current transaction between willing parties other than in a forced liquidation sale. If a quoted market price is available for a financial instrument, the estimated fair value would be calculated based upon the market price per trading unit of the instrument. If no ’s judgment regarding current economic conditions, interest rate risk, expected cash flows, future estimated losses, and other factors as determined through various option pricing formulas or simulation modeling. Since many of these assumptions result from judgments made by management based upon estimates which are inherently uncertain, the resulting estimated fair values may not may As certain assets such as deferred tax assets and premises and equipment are not not The Company employed simulation modeling in determining the estimated fair value of financial instruments for which quoted market prices were not upon the following assumptions. Cash and Cash Equivalents, Federal Home Loan Bank Stock, Accrued Interest Receivable, Accrued Interest Payable, and Short-Term Borrowings The fair value is equal to the current carrying value. Bank-Owned Life Insurance The fair value is equal to the cash surrender value of the life insurance policies. Investment Securities Available for Sale The fair value of investment securities is equal to the available quoted market price. If no Loans Held for Sale Loans held for sale are carried at lower of cost or fair value. The fair value of loans held for sale is based on secondary market pricing on portfolios with similar characteristics. The changes in fair value of the assets are largely driven by changes in interest rates subsequent to loan funding and changes in the fair value of servicing associated with the mortgage loan held for sale. Within this total are student loans held for sale for which the fair value is based on readily determinable market prices, which is a level I Price. Net Loans The fair value is estimated by discounting future cash flows using current market inputs at which loans with similar terms and qualities would be made to borrowers of similar credit quality. Where quoted market prices were available, primarily for certain residential mortgage loans, such market rates were utilized as estimates for fair value. Deposits and Other Borrowed Funds The fair values of certificates of deposit and other borrow ings are based on the discounted value of contractual cash flows. The discount rates are estimated using rates currently offered for similar instruments with similar remaining maturities. Demand, savings, and money market deposits are valued at the amount payable on demand as of year end. Commitments to Extend Credit These financial instruments are generally not not not of credit are presented in Note 15.

Note 19 - Accumulated Other Com

Note 19 - Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Comprehensive Income (Loss) Note [Text Block]	19. A CCUMULATED OTHER COMPREHENSIVE INCOME The following table presents the changes in accumulated ot her comprehensive income by component net of tax: Unrealized gains on available-for-sale (Dollars in thousands) securities (a) Balance as of December 31, 2014 $ 2,548 Other comprehensive income before reclassification 60 Amount reclassified from accumulated other comprehensive income (213 ) Period change (153 ) Balance at December 31, 2015 $ 2,395 Balance as of December 31, 2015 $ 2,395 Other comprehensive (loss) before reclassification (994 ) Amount reclassified from accumulated other comprehensive income (200 ) Period change (1,194 ) Balance at December 31, 2016 $ 1,201 Balance as of December 31, 2016 $ 1,201 Other comprehensive income before reclassification 475 Amount reclassified from accumulated other comprehensive income (585 ) Period change (110 ) Balance at December 31, 2017 $ 1,091 (a) All amounts are net of tax. Amounts in parentheses indicate debits to accumulated other comprehensive income. The following tables present significant amounts reclassified out of each component of accumul ated other comprehensive income: Amount Reclassified from Accumulated Other Affected Line Item in Comprehensive Income the Statement Where (Dollars in thousands) (a) Net Income is Details about other comprehensive income December 31, 2017 Presented Unrealized gains on available-for-sale securities $ 886 Investment securities gains, net (301 ) Income taxes $ 585 Affected Line Item in the Statement Where (Dollars in thousands) Net Income is Details about other comprehensive income December 31, 2016 Presented Unrealized gains on available-for-sale securities $ 303 Investment securities gains, net (103 ) Income taxes $ 200 Affected Line Item in the Statement Where (Dollars in thousands) Net Income is Details about other comprehensive income December 31, 2015 Presented Unrealized gains on available-for-sale securities $ 323 Investment securities gains, net (110 ) Income taxes $ 213 (a) Amounts in parentheses indicate expenses and other amounts indicate income.

Note 20 - Business Acquisition

Note 20 - Business Acquisition	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Business Combination Disclosure [Text Block]	20. BUSINESS ACQUISITION In the second 2016, 100% for cash and stock. Liberty was an Ohio bank that conducted its business from a main office in Beachwood, Ohio with branches in Twinsburg and Solon, Ohio. The transaction closed on January 12, 2017, Under the terms of the merger agreement, the Company acquired all of the outstanding shares of Liberty for a total purchase price of $42.2 As a result of the acquisition, the Company issued 544,610 $21.2 $38.55 January 12, 2017. $488,000, December 31, 2017. The acquired assets and assumed liabilities were measured at estimated fair values. The Company relied on the income approach to estimate the value of the loans. The loans ’ underlying characteristics (account types, remaining terms (in months), annual interest rates or coupons, interest types, past delinquencies, timing of principal and interest payments, current market rates, loan-to-value ratios, loss exposures and remaining balance) were considered. Various assumptions were applied regarding credit, interest, and prepayment risks for the loans based on loan types, payment types and fixed or variable classifications. The Company also recorded an identifiable intangible asset representin g the core deposit base of Liberty. The discounted cash flow method was used in valuing this intangible. This method is based upon the principle of future benefits; economic value is based on anticipated future benefits as measured by cash flows expected to occur in the future. The estimated future cash flows are converted to a value indicator by determining the present value of the cash flows using a discount rate. The discount rate is based upon the nature of the business, the level of risk, and the expected stability of the estimated future cash flows. The higher the risk, the higher the discount rate, and the lower the value indicator. Time deposit fair values were estimated using an income approach. The methodology entailed discounting the contractual cash flows of the instruments over their remaining contractual lives at prevailing market rates. Interest and principal payments were projected for each category of CDs over the period from the valuation date to the maturity dates. These payments represent future cash flows to be paid to depositors until maturity. Using appropriate market interest rates for each category of CDs, the future cash flows were discounted to their present value equivalents. The market interest rates were selected based on peer rates in Ohio from Bankrate as of the valuation date. The following table summarizes the purchase of Liberty as of January 12, 2017: (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 shares $ 38.55 Purchase price assigned to Liberty common shares exchanged for Middlefield Banc Corp. shares 20,995 Purchase Price Consideration in Cash Purchase price assigned to Liberty common shares exchanged for cash 21,173 Total Purchase Price 42,168 Previously held equity interest in Liberty 1,068 Net Assets Acquired: Liberty shareholders equity $ 30,474 Adjustments to reflect assets acquired at fair value: Loans Allowance for loan loss 3,257 Loans - interest rate 578 Loans - general credit (2,161 ) Core deposit intangible 3,087 Other 254 Adjustments to reflect liabilities acquired at fair value: Time deposits (141 ) Deferred taxes (906 ) Change in control (1,718 ) Total net assets acquired 32,724 Goodwill resulting from merger $ 10,512 The following condensed statement reflects the amounts recognized as of the acquisition date for each major class of asset acquired and liability assumed, at fair value: (In Thousands) Total purchase price $ 42,168 Previously held equity interest in Liberty 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 Other assets 997 Time deposits (30,744 ) Non-time deposits (167,300 ) Accrued interest payable (47 ) Deferred taxes (906 ) Other liabilities (2,754 ) Total net assets acquired 32,724 Goodwill resulting from the Liberty merger $ 10,512 Middlefield recorded goodwi ll and intangibles associated with the purchase of Liberty totaling $10.5 not not December 31, 2017. $575,000 Identifiable intangibles are amortized to their estimated residual values over the expected useful lives. Such lives are also periodically reassessed to determine if any amortization period adjustments are required. During the year ended December 31, 2017, no December 31, 2017 $2.7 $342,000 As of December 31, 2017, Remaining 2018 $ 352 2019 341 2020 332 2021 321 2022 309 Thereafter 1,094 $ 2,749 Results of operations for Liberty prior to the acquisition date are not December 31, 2017. December 31, 2017 Actual from Acquisition Date Through December 31, 2017 (in thousands) Net interest income $ 10,354 Noninterest income $ 744 Net income $ 2,625 The table below presents unaudited pro forma information as if the acquisition of Liberty had occurred on January 1, 2016. not not ’s estimate of any revenue-enhancing opportunities nor anticipated cost savings as a result of the integration and consolidation of the acquisition. Merger and acquisition integration costs and amortization of fair value adjustments are included in the amounts below. Pro Formas Twelve-month period ended December 31, 2017 2016 (in thousands, except per share data) Net interest income $ 37,646 $ 34,817 Noninterest income 4,920 5,485 Net income $ 8,438 $ 8,692 Pro forma earnings per share: Basic $ 2.79 $ 4.12 Diluted $ 2.77 $ 4.10 Included in the above net income amount for the twelve December 31, 2017 $1.1

Note 21 - Parent Company

Note 21 - Parent Company	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	21. PARENT COMPANY Following are condensed financial statements for the Company. CONDENSED BALANCE SHEET (Dollar amounts in thousands) December 31, 2017 2016 ASSETS Cash and due from banks $ 1,766 $ 2,543 Investment securities available for sale 625 1,139 Investment in nonbank subsidiary 2,363 2,360 Investment in subsidiary bank 119,946 76,365 Other assets 3,450 2,837 TOTAL ASSETS $ 128,150 $ 85,244 LIABILITIES Trust preferred securities $ 8,248 $ 8,248 Other liabilities 39 36 TOTAL LIABILITIES 8,287 8,284 STOCKHOLDERS' EQUITY 119,863 76,960 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 128,150 $ 85,244 CONDENSED STATEMENT OF COMPREHENSIVE INCOME Year Ended December 31, (Dollar amounts in thousands) 2017 2016 2015 INCOME Dividends from subsidiary bank $ 10,425 $ 3,400 $ 4,023 Gain on sale of investment securities 488 - - Other 80 24 19 Total income 10,993 3,424 4,042 EXPENSES Interest expense 460 366 290 Other 2,091 1,856 860 Total expenses 2,551 2,222 1,150 Income before income tax benefit 8,442 1,202 2,892 Income tax benefit (673 ) (561 ) (386 ) Income before equity in undistributed net income of subsidiaries 9,115 1,763 3,278 Equity in undistributed net income of subsidiaries 340 4,653 3,587 NET INCOME $ 9,455 $ 6,416 $ 6,865 Comprehensive Income $ 9,345 $ 5,222 $ 6,712 CONDENSED STATEMENT OF CASH FLOWS Year Ended December 31 , (Dollar amounts in thousands ) 201 7 201 6 201 5 OPERATING ACTIVITIE S Net incom e $ 9,455 $ 6,416 $ 6,865 Adjustments to reconcile net income to : Equity in undistributed net income of Middlefield Banking Compan y (337 ) (4,710 ) (3,703 ) Equity in undistributed net O (3 ) 57 116 Stock-based compensation expens e 33 29 18 Gain on sale of investment securitie s (488 ) - - Other, ne t 282 (484 ) (503 ) Net cash provided by operating activitie s 8,942 1,308 2,793 INVESTING ACTIVITIES Acquisition, net of cash paid (22,249 ) - - FINANCING ACTIVITIE S Net (decrease) increase in short-term borrowing s - (9,499 ) 6,363 Purchase of treasury stoc k - - (6,784 ) Proceeds from issuance of common stoc k 15,164 11,210 - Stock options exercise d 184 (6 ) (7 ) Proceeds from dividend reinvestment pla n 540 519 651 Cash dividend s (3,358 ) (2,318 ) (2,153 ) Net cash used for financing activitie s 12,530 (94 ) (1,930 ) Increase (decrease) in cash (777 ) 1,214 863 CASH AT BEGINNING OF YEA R 2,543 1,329 466 CASH AT END OF YEA R $ 1,766 $ 2,543 $ 1,329 SUPPLEMENTAL INFORMATION Common stock issued in business acquisition $ 20,995 $ - $ -

Note 22 - Selected Quarterly Fi

Note 22 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Quarterly Financial Information [Text Block]	22. SELECTED QUARTERLY FINANCIAL DATA (Unaudited) (Dollar amounts in thousands) Three Months Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Total interest and dividend income $ 10,199 $ 10,902 $ 11,330 $ 11,564 Total interest expense 1,442 1,625 1,818 1,762 Net interest income 8,757 9,277 9,512 9,802 Provision for loan losses 165 170 280 430 Net interest income after provision for loan losses 8,592 9,107 9,232 9,372 Total noninterest income 1,511 989 1,441 918 Total noninterest expense 7,267 6,704 7,297 6,217 Income before income taxes 2,836 3,392 3,376 4,073 Income taxes 736 885 914 1,687 Net income $ 2,100 $ 2,507 $ 2,462 $ 2,386 Per share data: Net income Basic $ 0.78 $ 0.84 $ 0.77 $ 0.73 Diluted 0.78 0.83 0.76 0.73 Average shares outstanding: Basic 2,679,816 3,000,451 3,212,335 3,215,300 Diluted 2,692,015 3,014,140 3,223,753 3,231,791 (Dollar amounts in thousands) Three Months Ended March 31, June 30, September 30, December 31, 2016 2016 2016 2016 Total interest and dividend income $ 7,348 $ 7,405 $ 7,420 $ 7,821 Total interest expense 1,025 1,066 1,026 1,073 Net interest income 6,323 6,339 6,394 6,748 Provision for loan losses 105 105 105 255 Net interest income after provision for loan losses 6,218 6,234 6,289 6,493 Total noninterest income 909 1,173 977 900 Total noninterest expense 5,338 4,915 5,662 4,957 Income before income taxes 1,789 2,492 1,604 2,436 Income taxes 302 566 261 776 Net income $ 1,487 $ 1,926 $ 1,343 $ 1,660 Per share data: Net income Basic $ 0.79 $ 0.94 $ 0.60 $ 0.71 Diluted 0.79 0.94 0.60 0.70 Average shares outstanding: Basic 1,878,177 2,051,137 2,247,587 2,251,412 Diluted 1,886,943 2,059,411 2,256,230 2,264,712

Note 23 - Return on Equity and

Note 23 - Return on Equity and Assets	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Return on Equity and Assets [Text Block]	23. RETURN ON EQUITY AND ASSETS The ratio of net income to average shareholders ’ equity and average total assets and certain other ratios are as follows for periods ended December 31: (Dollars in thousands) 2017 2016 2015 Average total assets $ 1,069,656 $ 757,052 $ 710,271 Average shareholders' equity $ 110,966 $ 68,741 $ 64,655 Net income $ 9,455 $ 6,416 $ 6,865 Net income available to common shareholders $ 9,455 $ 6,416 $ 6,865 Cash dividends declared per share $ 1.08 $ 1.08 $ 1.07 Return on average total assets 0.88 % 0.85 % 0.97 % Return on average shareholders' equity 8.52 % 9.33 % 10.62 % Dividend payout ratio (1) 35.52 % 36.18 % 31.36 % Average shareholders' equity to average assets 10.37 % 9.08 % 9.10 % ( 1

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Nature of Operations and Basis of Presentation Middlefield Banc Corp. (the “Company”) is an Ohio corporation organized to become the holding company of The Middlefield Banking Company (“MBC”). MBC is a state-c hartered bank located in Ohio. On October 23, 2009, fourteen The consolidated financial statements of the Company include its wholly owned subsidiaries, MBC and EMORECO, Inc. Significant intercompany items have been eliminated in preparing the consolidated financial statements. On January 12, 2017, $37.96 1.1934 ’s common stock in exchange for each share of Liberty common stock they owned immediately prior to the merger. The Company issued 544,610 $42.2 three February, 2017. The financial statements have been pr epared in conformity with U.S. Generally Accepted Accounting Principles. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the balance sheet date and revenues and expenses for the period. Actual results could differ from those estimates.
Marketable Securities, Policy [Policy Text Block]	Investment Securities Investment securities are classified at the time of purchase, based on management ’s intention and ability, as securities held to maturity or securities available for sale. Debt securities acquired with the intent and ability to hold to maturity are stated at cost adjusted for amortization of premium and accretion of discount, which are computed using a level yield method and recognized as adjustments of interest income. Certain other debt securities have been classified as available for sale to serve principally as a source of liquidity. Unrealized holding gains and losses for available-for-sale securities are reported as a separate component of stockholders’ equity, net of tax, until realized. Realized security gains and losses are computed using the specific identification method. Interest and dividends on investment securities are recognized as income when earned. Securities are evaluated on at least a quarterly basis and more frequently when economic or market conditions warrant such an evaluation to determine whether a decline in their value is other than temporary. For debt securities, management considers whether the present value of cash flows expected to be collected are less than the security ’s amortized cost basis (the difference defined as the credit loss), the magnitude and duration of the decline, the reasons underlying the decline and the Bank’s intent to sell the security or whether it is more likely than not not not not one not
Stockholders' Equity, Policy [Policy Text Block]	Restricted Stock Common stock of the Federal Home Loan Bank (“FHLB”) represents ownership in an institution that is wholly owned by other financial institutions. This equity security is accounted for at cost and classified with other assets. The FHLB of Cincinnati has reported profits for 2017 2016, not December 31, 2017 2016.
Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block]	Mortgage Banking Activities Mortgage loans originated and intended for sale in the secondary market are carried at fair value. The Bank sells the loans on a servicing retained basis. Servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. The Bank measures servicing assets using the amortization method. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. Loan servicing rights are amortized in proportion to and over the period of estimated net future servicing revenue. The expected period of the estimated net servicing income is based in part on the expected prepayment of the underlying mortgages. The unamortized balance of mortgage servicing rights is included in accrued interest and other assets on the Consolidated Balance Sheet. Mortgage servicing rights are periodically evaluated for impairment. Impairment represents the excess of amortized cost over its estimated fair value. Impairment is determined by stratifying rights into tranches based on predominant risk characteristics, such as interest rate and original time to maturity. Any impairment is reported as a valuation allowance for an individual tranche. If the Company later determines that all or a portion of the impairment no Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of outstanding principal and are recorded as income when earned. The amortization of mortgage servicing rights is netted against loan servicing fee income. Late fees and ancillary fees related to loan servicing are not $50.4 $39.9 December 31, 2017 2016,
Finance, Loans and Leases Receivable, Policy [Policy Text Block]	Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff generally are reported at their outstanding unpaid principal balances net of the allowance for loan and lease losses. Interest income is recognized as income when earned on the accrual method. The accrual of interest is discontinued on a loan when management believes, after considering economic and business conditions, the borrower’s financial condition is such that collection of interest is doubtful. Interest received on nonaccrual loans is recorded as income or applied against principal according to management’s judgment as to the collectability of such principal. Loan origination fees and certain direct loan origination costs are being deferred and the net amount amortized as an adjustment of the related loan’s yield. Management is amortizing these amounts over the contractual life of the related loans.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Loan and Lease Losses The allowance for loan and lease losses represents the amount which management estimates is adequate to provide for probable loan losses inherent in the loan portfolio. The allowance method is used in providing for loan losses. Accordingly, all loan losses are charged to the allowance, and all recoveries are credited to it. The allowance for loan and lease losses is established through a provision for loan losses which is charged to operations. The provision is based on management’s periodic evaluation of the adequacy of the allowance for loan and lease losses, which encompasses the overall risk characteristics of the various portfolio segments, past experience with losses, the impact of economic conditions on borrowers, and other relevant factors. The estimates used in determining the adequacy of the allowance for loan and lease losses, including the amounts and timing of future cash flows expected on impaired loans, are particularly susceptible to significant change in the near term. A loan is considered impaired when it is probable the borrower will not first one four 90 not not and lease losses is maintained for estimated losses. Cash receipts on impaired loans are applied first Mortgage loans secured by one four ns are large groups of smaller-balance homogeneous loans and are measured for impairment collectively. Management determines the significance of payment delays on a case-by-case basis, taking into consideration all circumstances concerning the loan, the creditworthiness and payment history of the borrower, the length of the payment delay, and the amount of shortfall in relation to the principal and interest owed.
Loans and Leases Receivable, Valuation, Policy [Policy Text Block]	Loans Acquired Loans acquired including loans that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no not For purchased loans acquired that are not
Property, Plant and Equipment, Policy [Policy Text Block]	Premises and Equipment Land is carried at cost. Premises and equipment are stated at cost net of accumulated depreciation. Depreciation is computed on the straight-line method over the estimated useful lives of the assets, which range from 3 20 3 40
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill The Company accounts for goodwill using a three No
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Intangible Assets Intangible assets include core deposit intangibles, which are a measure of the value of consumer demand and savings deposits acquired in business combinations accounted for as purchases. The core deposit intangibles are being amortized to their estimated residual values over their expected useful lives, commonly of ten
Life Insurance Corporate or Bank Owned [Policy Text Block]	Bank-Owned Life Insurance (“BOLI”) The Company owns insurance on the lives of a certain group of key employees. The policies were purchased to help offset the increase in the costs of various fringe benefit plans including healthcare. The cash surrender value of these policies is included as an asset on the Consolidated Balance Sheet and any increases in the cash surrender value are recorded as noninterest income on the Consolidated Statement of Income. In the event of the death of an insured individual under these policies, the Company would receive a death benefit, which would be recorded as noninterest income.
Real Estate, Policy [Policy Text Block]	Other Real Estate Owned Real estate properties acquired through foreclosure are initially recorded at fair value at the date of foreclosure, establishing a new cost basis. After foreclosure, management periodically performs valuations and the real estate is carried at the lower of cost or fair value less estimated cost to sell. Revenue and expenses from operations of the properties, gains or losses on sales and additions to the valuation allowance are included in operating results.
Income Tax, Policy [Policy Text Block]	Income Taxes The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are reflected at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be realized or settled. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.
Earnings Per Share, Policy [Policy Text Block]	Earnings Per Share The Company provides dua l presentation of basic and diluted earnings per share. Basic earnings per share is calculated utilizing net income as reported in the numerator and average shares outstanding in the denominator. The computation of diluted earnings per share differs in that the dilutive effects of any stock options, warrants, and convertible securities are adjusted in the denominator.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-Based Compensation The Company accounts for stock compensation based on the grant date fair value of all share-based payment awards that are expected to vest, including employee share options to be recognized as employee compensation expense over the requisite service period. Compensation cost is recognized for restricted stock units issued to employees based on the fair value of these awards at the date of grant. The market price of the Company ’s common shares at the date of grant is used to estimate the fair value of restricted stock units and stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period, and is recorded in "Salaries" expense. (See Note 14
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Flow Information The Company has defined cash and cash equivalents as those amounts included in the Consolidated Balance Sheet captions as “Cash and due from banks” and “Federal funds sold” with original maturities of less than 90
Advertising Costs, Policy [Policy Text Block]	Advertising Costs Advertising costs are expensed as incurred.
Reclassification, Policy [Policy Text Block]	Reclassification of Comparative Amounts Certain comparative amounts for prior years have been reclassified to conform to current-year presentations. Such reclassifications did not
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements: In May 2014, 2014 09, December 15, 2016, not not not 606. In August 2015, 2015 14, 606 2014 09 one not 2014 09 December 15, 2017, 2014 09 December 15, 2018, December 15, 2019. In February 2016, 2016 02, 842 A lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. A short-term lease is defined as one 12 not may December 15, 2018, December 15, 2019, December 15, 2020. may not 1 In June 2016, 2016 13, ’s current estimate of credit losses that are expected to occur over the remaining life of a financial asset. The income statement will be effected for the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. ASU 2016 13 December 15, 2019, December 15, 2018. first 12 January 1, 2020. In January 2017, 2017 01, 805 not December 15, 2017, December 15, 2018, December 15, 2019. not ’s financial statements. In January 2017, 2017 04, 2 2, ’s fair value; however, the loss recognized should not December 15, 2019. not December 15, 2020. not December 15, 2021. not In March 2017, 2017 08, – Nonrefundable Fees and Other Costs (Subtopic 310 20 not December 15, 2018. December 15, 2019, December 15, 2020. not In May 2017, 2017 09, – Stock Compensation (Topic 718 not not December 15, 2017. 1 not 2 not In February 2018, 2018 02, – Reporting Comprehensive Income (Topic 220 2017 not not not not December 15, 2018. not may

Note 2 - Earnings Per Share (Ta

Note 2 - Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Weighted Average Number of Shares [Table Text Block]	2017 2016 2015 Weighted-average common shares outstanding 3,415,115 2,494,022 2,251,365 Average treasury stock shares (386,165 ) (386,165 ) (236,399 ) Weighted-average common shares and common stock equivalents used to calculate basic earnings per share 3,028,950 2,107,857 2,014,966 Additional common stock equivalents (stock options) used to calculate diluted earnings per share 23,635 11,357 9,154 Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share 3,052,585 2,119,214 2,024,120

Note 3 - Investment Securitie34

Note 3 - Investment Securities Available for Sale (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]	December 31, 2017 Gross Gross Amortized Unrealized Unrealized Fair (Dollar amounts in thousands) Cost Gains Losses Value U.S. government agency securities $ 8,664 $ 126 $ (71 ) $ 8,719 Obligations of states and political subdivisions: Taxable 504 8 - 512 Tax-exempt 65,408 1,547 (38 ) 66,917 Mortgage-backed securities in government-sponsored entities 18,640 157 (287 ) 18,510 Total debt securities 93,216 1,838 (396 ) 94,658 Equity securities in financial institutions 415 210 - 625 Total $ 93,631 $ 2,048 $ (396 ) $ 95,283 December 31, 2016 Gross Gross Amortized Unrealized Unrealized Fair (Dollar amounts in thousands) Cost Gains Losses Value U.S. government agency securities $ 10,158 $ 174 $ (96 ) $ 10,236 Obligations of states and political subdivisions: Taxable 1,615 129 (4 ) 1,740 Tax-exempt 78,327 1,678 (522 ) 79,483 Mortgage-backed securities in government-sponsored entities 20,128 202 (261 ) 20,069 Private-label mortgage-backed securities 1,579 130 - 1,709 Total debt securities 111,807 2,313 (883 ) 113,237 Equity securities in financial institutions 750 389 - 1,139 Total $ 112,557 $ 2,702 $ (883 ) $ 114,376
Investments Classified by Contractual Maturity Date [Table Text Block]	Amortized Fair (Dollar amounts in thousands) Cost Value Due in one year or less $ 2,340 $ 2,377 Due after one year through five years 9,718 9,878 Due after five years through ten years 10,992 11,012 Due after ten years 70,166 71,391 Total $ 93,216 $ 94,658
Realized Gain (Loss) on Investments [Table Text Block]	2017 2016 2015 Proceeds from sales $ 6,474 $ 9,063 $ 15,686 Gross realized gains 911 * 309 440 Gross realized losses (25 ) (6 ) (117 )
Schedule of Unrealized Loss on Investments [Table Text Block]	December 31, 2017 Less than Twelve Months Twelve Months or Greater Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized (Dollar amounts in thousands) Value Losses Value Losses Value Losses U.S. government agency securities $ 557 $ (4 ) $ 4,036 $ (67 ) $ 4,593 $ (71 ) Obligations of states and political subdivisions Tax-exempt 1,009 (6 ) 2,784 (32 ) 3,793 (38 ) Mortgage-backed securities in government-sponsored entities 5,698 (71 ) 8,734 (216 ) 14,432 (287 ) Total $ 7,264 $ (81 ) $ 15,554 $ (315 ) $ 22,818 $ (396 ) December 31, 2016 Less than Twelve Months Twelve Months or Greater Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized (Dollar amounts in thousands) Value Losses Value Losses Value Losses U.S. government agency securities $ 3,803 $ (47 ) $ 1,316 $ (49 ) $ 5,119 $ (96 ) Obligations of states and political subdivisions Taxable 502 (4 ) - - 502 (4 ) Tax-exempt 23,554 (522 ) - - 23,554 (522 ) Mortgage-backed securities in government-sponsored entities 9,066 (126 ) 4,438 (135 ) 13,504 (261 ) Total $ 36,925 $ (699 ) $ 5,754 $ (184 ) $ 42,679 $ (883 )

Note 4 - Loans and Related Al35

Note 4 - Loans and Related Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	2017 2016 Commercial and industrial $ 101,346 $ 60,630 Real estate - construction 47,017 23,709 Real estate - mortgage: Residential 318,157 270,830 Commercial 437,947 249,490 Consumer installment 18,746 4,481 923,213 609,140 Less: Allowance for loan and lease losses (7,190 ) (6,598 ) Net loans $ 916,023 $ 602,542
Schedule Of Financing Receivable By Segment [Table Text Block]	Real Estate- Mortgage December 31, 2017 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Loans: Individually evaluated for impairment $ 3,627 $ 44 $ 2,824 $ 5,610 $ 4 $ 12,109 Collectively evaluated for impairment 97,719 46,973 315,333 432,337 18,742 911,104 Total loans $ 101,346 $ 47,017 $ 318,157 $ 437,947 $ 18,746 $ 923,213 Real estate- Mortgage December 31, 2016 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Loans: Individually evaluated for impairment $ 1,190 $ 913 $ 3,135 $ 7,187 $ 5 $ 12,430 Collectively evaluated for impairment 59,440 22,796 267,695 242,303 4,476 596,710 Total loans $ 60,630 $ 23,709 $ 270,830 $ 249,490 $ 4,481 $ 609,140
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]	Real Estate- Mortgage December 31, 2017 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Allowance for loan and lease losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 694 $ - $ 140 $ 733 $ - $ 1,567 Collectively evaluated for impairment 305 313 1,620 3,303 82 5,623 Total ending allowance balance $ 999 $ 313 $ 1,760 $ 4,036 $ 82 $ 7,190 Real Estate- Mortgage December 31, 2016 Commercial and industrial Real estate- construction Residential Commercial Consumer installment Total Allowance for loan and lease losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ 90 $ - $ 251 $ 186 $ - $ 527 Collectively evaluated for impairment 358 172 2,567 2,949 25 6,071 Total ending allowance balance $ 448 $ 172 $ 2,818 $ 3,135 $ 25 $ 6,598 Commercial and industrial Real estate- construction Real estate- residential mortgage Real estate- commercial mortgage Consumer installment Total ALLL balance at December 31, 2016 $ 448 $ 172 $ 2,818 $ 3,135 $ 25 $ 6,598 Charge-offs (536 ) - (117 ) (39 ) (462 ) (1,154 ) Recoveries 234 34 241 111 81 701 Provision 853 107 (1,182 ) 829 438 1,045 ALLL balance at December 31, 2017 $ 999 $ 313 $ 1,760 $ 4,036 $ 82 $ 7,190 Commercial and industrial Real estate- construction Real estate- residential mortgage Real estate- commercial mortgage Consumer installment Total ALLL balance at December 31, 2015 $ 867 $ 276 $ 3,139 $ 2,078 $ 25 $ 6,385 Charge-offs (237 ) - (414 ) (70 ) (22 ) (743 ) Recoveries 90 - 141 140 15 386 Provision (272 ) (104 ) (48 ) 987 7 570 ALLL balance at December 31, 2016 $ 448 $ 172 $ 2,818 $ 3,135 $ 25 $ 6,598
Impaired Financing Receivables [Table Text Block]	December 31, 2017 Impaired Loans Unpaid Recorded Principal Related Investment Balance Allowance With no related allowance recorded: Commercial and industrial $ 450 $ 1,006 $ - Real estate - construction 44 44 - Real estate - mortgage: Residential 1,685 1,904 - Commercial 1,870 1,984 - Consumer installment 4 4 - Total $ 4,053 $ 4,942 $ - With an allowance recorded: Commercial and industrial $ 3,177 $ 3,888 $ 694 Real estate - mortgage: Residential 1,139 1,179 140 Commercial 3,740 3,913 733 Total $ 8,056 $ 8,980 $ 1,567 Total: Commercial and industrial $ 3,627 $ 4,894 $ 694 Real estate - construction 44 44 - Real estate - mortgage: Residential 2,824 3,083 140 Commercial 5,610 5,897 733 Consumer installment 4 4 - Total $ 12,109 $ 13,922 $ 1,567 December 31, 2016 Impaired Loans Unpaid Recorded Principal Related Investment Balance Allowance With no related allowance recorded: Commercial and industrial $ 319 $ 318 $ - Real estate - construction 913 909 - Real estate - mortgage: Residential 2,142 2,140 - Commercial 2,031 2,027 - Total $ 5,405 $ 5,394 $ - With an allowance recorded: Commercial and industrial $ 871 $ 868 $ 90 Real estate - mortgage: Residential 993 991 251 Commercial 5,156 5,147 186 Consumer installment 5 5 - Total $ 7,025 $ 7,011 $ 527 Total: Commercial and industrial $ 1,190 $ 1,186 $ 90 Real estate - construction 913 909 - Real estate - mortgage: Residential 3,135 3,131 251 Commercial 7,187 7,174 186 Consumer installment 5 5 - Total $ 12,430 $ 12,405 $ 527
Schedule of Additional Information Related to Impaired Loans [Table Text Block]	As of December 31, 2017 As of December 31, 2016 As of December 31, 2015 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Commercial and industrial $ 2,378 $ 178 $ 1,211 $ 32 $ 1,468 $ 100 Real estate - construction 565 1 1,281 10 2,407 115 Real estate - mortgage: Residential 3,068 89 3,529 98 4,356 160 Commercial 6,820 446 7,384 368 5,203 350 Consumer installment 5 1 6 1 6 - Total $ 12,836 $ 715 $ 13,411 $ 509 $ 13,440 $ 725
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	December 31, 2017 Number of Contracts Pre-Modification Post-Modification Term Outstanding Recorded Outstanding Recorded Troubled Debt Restructurings Modification Other Total Investment Investment Commercial and industrial 4 - 4 $ 127 $ 127 Residential real estate 5 - 5 256 256 December 31, 2016 Number of Contracts Pre-Modification Post-Modification Term Outstanding Recorded Outstanding Recorded Troubled Debt Restructurings Modification Other Total Investment Investment Commercial and industrial 5 - 5 $ 610 $ 610 Residential real estate 4 - 4 166 166 Commercial real estate 1 - 1 311 311 December 31, 2015 Number of Contracts Pre-Modification Post-Modification Term Outstanding Recorded Outstanding Recorded Troubled Debt Restructurings Modification Other Total Investment Investment Commercial and industrial 6 - 6 $ 434 $ 434 Real estate construction 1 - 1 181 181 Residential real estate 5 1 6 515 535 Commercial real estate 1 - 1 270 270
Financing Receivable Credit Quality Indicators [Table Text Block]	December 31, 2017 Special Total Pass Mention Substandard Doubtful Loans Commercial and industrial $ 95,621 $ 1,942 $ 3,783 $ - $ 101,346 Real estate - construction 46,995 - 22 - 47,017 Real estate - mortgage: Residential 312,176 723 5,258 - 318,157 Commercial 424,225 9,164 4,558 - 437,947 Consumer installment 18,742 - 4 - 18,746 Total $ 897,759 $ 11,829 $ 13,625 $ - $ 923,213 December 31, 2016 Special Total Pass Mention Substandard Doubtful Loans Commercial and industrial $ 58,539 $ 663 $ 1,428 $ - $ 60,630 Real estate - construction 23,541 144 24 - 23,709 Real estate - mortgage: Residential 264,481 428 5,921 - 270,830 Commercial 240,678 4,422 4,390 - 249,490 Consumer installment 4,467 - 14 - 4,481 Total $ 591,706 $ 5,657 $ 11,777 $ - $ 609,140
Past Due Financing Receivables [Table Text Block]	December 31, 2017 30-59 Days 60-89 Days 90 Days+ Total Total Current Past Due Past Due Past Due Past Due Loans Commercial and industrial $ 99,633 $ 1,607 $ 29 $ 77 $ 1,713 $ 101,346 Real estate - construction 47,017 - - - - 47,017 Real estate - mortgage: Residential 314,866 1,977 227 1,087 3,291 318,157 Commercial 434,879 1,907 1 1,160 3,068 437,947 Consumer installment 18,736 10 - - 10 18,746 Total $ 915,131 $ 5,501 $ 257 $ 2,324 $ 8,082 $ 923,213 December 31, 2016 30-59 Days 60-89 Days 90 Days+ Total Total Current Past Due Past Due Past Due Past Due Loans Commercial and industrial $ 60,407 $ 17 $ 2 $ 204 $ 223 $ 60,630 Real estate - construction 23,709 - - - - 23,709 Real estate - mortgage: Residential 268,041 1,909 207 673 2,789 270,830 Commercial 249,081 92 - 317 409 249,490 Consumer installment 4,465 - 10 6 16 4,481 Total $ 605,703 $ 2,018 $ 219 $ 1,200 $ 3,437 $ 609,140
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]	December 31, 2017 90+ Days Past Nonaccrual Due and Accruing Commercial and industrial $ 1,120 $ - Real estate - construction - - Real estate - mortgage: Residential 4,002 - Commercial 3,311 - Consumer installment - - Total $ 8,433 $ - December 31, 2016 90+ Days Past Nonaccrual Due and Accruing Commercial and industrial $ 454 $ - Real estate - construction - - Real estate - mortgage: Residential 4,034 - Commercial 1,409 - Consumer installment 6 - Total $ 5,903 $ -
Subsequently Defaulted [Member]
Notes Tables
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	December 31, 2016 Number of Recorded Troubled Debt Restructurings subsequently defaulted Contracts Investment Commercial and industrial 2 $ 7 Real estate construction 1 - Residential real estate 4 278 Commercial real estate 1 119 December 31, 2015 Number of Recorded Troubled Debt Restructurings subsequently defaulted Contracts Investment Commercial and industrial 2 $ 14 Real estate construction 1 130

Note 6 - Premises and Equipme36

Note 6 - Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Property, Plant and Equipment [Table Text Block]	(Dollar amounts in thousands) 2017 2016 Land and land improvements $ 2,920 $ 2,891 Building and leasehold improvements 14,277 12,081 Furniture, fixtures, and equipment 7,010 5,404 Total premises and equipment 24,207 20,376 Less accumulated depreciation and amortization 12,354 9,173 Total premises and equipment, net $ 11,853 $ 11,203

Note 7 - Goodwill and Intangi37

Note 7 - Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	2018 $ 352 2019 341 2020 332 2021 321 2022 309 Thereafter 1,094 Total $ 2,749

Note 8 - Other Assets (Tables)

Note 8 - Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Other Assets [Table Text Block]	(Dollar amounts in thousands) 2017 2016 Restricted stock $ 3,589 $ 2,204 Accrued interest receivable on investment securities 707 812 Accrued interest receivable on loans 2,581 1,614 Deferred tax asset, net 647 1,607 Other 1,620 1,265 Total $ 9,144 $ 7,502

Note 10 - Short-term Borrowin39

Note 10 - Short-term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Short-term Debt [Table Text Block]	(Dollar amounts in thousands) 2017 2016 Balance at year-end $ 74,707 $ 68,359 Average balance outstanding 63,910 37,130 Maximum month-end balance 114,025 68,359 Weighted-average rate at year-end 1.36 % 0.61 % Weighted-average rate during the year 1.18 % 0.89 %
Schedule of Repurchase Agreements [Table Text Block]	Repurchase Agreements (Sweep) Accounted for as Secured Borrowings (Dollar amounts in thousands) Overnight and Continuous December 31, 2017 December 31, 2016 Repurchase agreements secured by: Mortgage-backed securities in government sponsored entities $ 2,040 $ 2,667 Tax-exempt obligations of states and political subdivisions 495 968 Gross amount of pledged collateral 2,535 3,635 Gross amount of recognized liabilities $ 1,989 $ 2,129

Note 11 - Other Borrowings (Tab

Note 11 - Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Debt [Table Text Block]	Weighted- Stated interest (Dollar amounts in thousands) Maturity range average rate range Description from to interest rate from to 2017 2016 Fixed-rate amortizing 02/01/18 10/01/28 1.24 % 1.01 % 4.47 % $ 20,817 $ 1,189 Junior subordinated debt 12/21/37 12/21/37 2.85 % 2.56 % 3.05 % 8,248 8,248 Total $ 29,065 $ 9,437
Schedule of Maturities of Long-term Debt [Table Text Block]	(Dollar amounts in thousands) Weighted- Year Ending December 31, Amount Average Rate 2018 $ 20,252 1.16 % 2019 155 4.04 % 2020 116 4.04 % 2021 87 4.04 % 2022 65 4.04 % Beyond 2022 8,390 2.79 % Total $ 29,065 2.86 %

Note 12 - Other Liabilities (Ta

Note 12 - Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Other Liabilities [Table Text Block]	2017 2016 (Dollar amounts in thousands) Accrued interest payable $ 578 $ 395 Supplemental Executive Retirement Plan 1,427 1,125 Accrued salary expense 956 768 Other 1,546 843 Total $ 4,507 $ 3,131

Note 13 - Income Taxes (Tables)

Note 13 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	(Dollar amounts in thousands) 2017 2016 2015 Current payable $ 3,929 $ 1,998 $ 1,004 Deferred 293 (93 ) 558 Total provision $ 4,222 $ 1,905 $ 1,562
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	(Dollar amounts in thousands) 2017 2016 Deferred tax assets: Allowance for loan and lease losses $ 1,210 $ 2,243 Supplemental retirement plan 528 382 Investment security basis adjustment 18 66 Nonaccrual interest income 371 456 OREO adjustments 2 26 Accrued compensation 201 261 Other 86 82 Gross deferred tax assets 2,416 3,516 Deferred tax liabilities: Premises and equipment 356 445 Net unrealized gain on securities 347 618 FHLB stock dividends 139 225 Intangibles 307 449 Mortgage servicing rights 71 103 Deferred origination fees, net 294 63 Acquisition fair value adjustments 250 1 Other 5 5 Gross deferred tax liabilities 1,769 1,909 Net deferred tax assets $ 647 $ 1,607
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	(Dollar amounts in thousands) 2017 2016 2015 % of % of % of Pretax Pretax Pretax Amount Income Amount Income Amount Income Provision at statutory rate $ 4,651 34.0 % $ 2,829 34.0 % $ 2,866 34.0 % Tax-exempt income (1,045 ) (7.6 )% (1,177 ) (14.1 )% (1,347 ) (15.9 )% Nondeductible interest expense 32 0.2 % 32 0.4 % 34 0.4 % Nondeductible merger-related expense 43 0.3 % 186 2.2 % - - % Stock-based compensation (50 ) (0.4 )% - - % - - % Change in effective corporate tax rate 401 2.9 % - - % - - % Other 190 1.5 % 35 0.4 % 9 - % Actual tax expense and effective rate $ 4,222 30.9 % $ 1,905 22.9 % $ 1,562 18.5 %

Note 14 - Employee Benefits (Ta

Note 14 - Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]	Projected Payments 2018 $ 18,000 2019 12,000 2020 10,000 2021 2,000 Total $ 42,000
Share-based Compensation, Stock Options, Activity [Table Text Block]	2017 Weighted Average Exercise Price Per Share Outstanding, January 1 29,324 $ 23.67 Expired (1,337 ) 37.48 Exercised (8,237 ) 27.97 Outstanding, December 31 19,750 $ 20.94 Exercisable, December 31 19,750 $ 20.94
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	Outstanding Exercisable Grant Date Exercise Price Per Share Shares Contractual Average Life Average Exercise Price Per Share Shares Average Exercise Price Per Share November 10, 2008 $ 23.00 12,300 0.85 $ 23.00 12,300 $ 23.00 May 9, 2011 $ 17.55 7,450 3.35 $ 17.55 7,450 $ 17.55 19,750 19,750
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Units Weighted Average Grant Date Fair Value Per Share Nonvested at January 1, 2017 8,995 $ 32.93 Granted 5,825 $ 38.70 Forfeited (219 ) $ 38.70 Nonvested at December 31, 2017 14,601 $ 35.14 Expected to vest at December 31, 2017 14,601 $ 35.14

Note 15 - Commitments (Tables)

Note 15 - Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Other Commitments [Table Text Block]	(Dollar amounts in thousands) 2017 2016 Commitments to extend credit $ 234,023 $ 161,646 Standby letters of credit 1,015 1,416 Total $ 235,038 $ 163,062
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	2018 $ 655 2019 639 2020 641 2021 598 2022 365 Thereafter 920 Total $ 3,818

Note 17 - Regulatory Capital (T

Note 17 - Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	As of December 31, 2017 Tier 1 Risk Common Total Risk Leverage Based Equity Tier 1 Based The Middlefield Banking Company 9.47 % 10.88 % 10.88 % 11.64 % Middlefield Banc Corp. 10.20 % 11.64 % 10.79 % 12.41 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus fully phased-in capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (Bank only) 5.00 % 8.00 % 6.50 % 10.00 % As of December 31, 2016 Tier 1 Risk Common Total Risk Leverage Based Equity Tier 1 Based The Middlefield Banking Company 9.29 % 13.03 % 13.03 % 14.25 % Middlefield Banc Corp. 9.27 % 13.07 % 13.07 % 15.75 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus fully phased-in capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (Bank only) 5.00 % 8.00 % 6.50 % 10.00 %

Note 18 - Fair Value Disclosu46

Note 18 - Fair Value Disclosure Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	December 31, 2017 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a recurring basis: U.S. government agency securities $ - $ 8,719 $ - $ 8,719 Obligations of states and political subdivisions - 67,429 - 67,429 Mortgage-backed securities in government- sponsored entities - 18,510 - 18,510 Total debt securities - 94,658 - 94,658 Equity securities in financial institutions - 625 - 625 Total $ - $ 95,283 $ - $ 95,283 December 31, 2016 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a recurring basis: U.S. government agency securities $ - $ 10,236 $ - $ 10,236 Obligations of states and political subdivisions - 81,223 - 81,223 Mortgage-backed securities in government- sponsored entities - 20,069 - 20,069 Private-label mortgage-backed securities - 1,709 - 1,709 Total debt securities - 113,237 - 113,237 Equity securities in financial institutions - 1,139 - 1,139 Total $ - $ 114,376 $ - $ 114,376
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]	December 31, 2017 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a non-recurring basis: Impaired loans $ - $ - $ 3,072 $ 3,072 Other real estate owned - - 32 32 December 31, 2016 (Dollar amounts in thousands) Level I Level II Level III Total Assets measured on a non-recurring basis: Impaired loans $ - $ - $ 6,498 $ 6,498 Other real estate owned - - 511 511
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]	Quantitative Information about Level III Fair Value Measurements (Dollar amounts in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted Average) December 31, 2017 Impaired loans $ 3,072 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 86.1% (13.8%) Other real estate owned $ 32 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 10.0% Quantitative Information about Level III Fair Value Measurements (Dollar amounts in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted Average) December 31, 2016 Impaired loans $ 4,928 Discounted cash flow Discount rate 3.1% to 7.0% (5.1%) $ 1,570 Appraisal of collateral (1) Appraisal adjustment (2) 0.0% to 59.7% (28.2%) Other real estate owned $ 511 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 10.0%
Fair Value, by Balance Sheet Grouping [Table Text Block]	December 31, 2017 Carrying Total Value Level I Level II Level III Fair Value (in thousands) Financial assets: Cash and cash equivalents $ 39,886 $ 39,886 $ - $ - $ 39,886 Investment securities available for sale 95,283 - 95,283 - 95,283 Loans held for sale 463 - 463 - 463 Net loans 916,023 - - 913,323 913,323 Bank-owned life insurance 15,652 15,652 - - 15,652 Federal Home Loan Bank stock 3,589 3,589 - - 3,589 Accrued interest receivable 3,288 3,288 - - 3,288 Financial liabilities: Deposits $ 878,194 $ 635,207 $ - $ 242,020 $ 877,227 Short-term borrowings 74,707 74,707 - - 74,707 Other borrowings 29,065 - - 29,069 29,069 Accrued interest payable 578 578 - - 578 December 31, 2016 Carrying Total Value Level I Level II Level III Fair Value (in thousands) Financial assets: Cash and cash equivalents $ 32,495 $ 32,495 $ - $ - $ 32,495 Investment securities available for sale 114,376 - 114,376 - 114,376 Loans held for sale 634 - 634 - 634 Net loans 602,542 - - 604,447 604,447 Bank-owned life insurance 13,540 13,540 - - 13,540 Restricted stock 2,204 2,204 - - 2,204 Accrued interest receivable 2,426 2,426 - - 2,426 Financial liabilities: Deposits $ 629,934 $ 440,500 $ - $ 189,871 $ 630,371 Short-term borrowings 68,359 68,359 - - 68,359 Other borrowings 9,437 - - 9,512 9,512 Accrued interest payable 395 395 - - 395

Note 19 - Accumulated Other C47

Note 19 - Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Unrealized gains on available-for-sale (Dollars in thousands) securities (a) Balance as of December 31, 2014 $ 2,548 Other comprehensive income before reclassification 60 Amount reclassified from accumulated other comprehensive income (213 ) Period change (153 ) Balance at December 31, 2015 $ 2,395 Balance as of December 31, 2015 $ 2,395 Other comprehensive (loss) before reclassification (994 ) Amount reclassified from accumulated other comprehensive income (200 ) Period change (1,194 ) Balance at December 31, 2016 $ 1,201 Balance as of December 31, 2016 $ 1,201 Other comprehensive income before reclassification 475 Amount reclassified from accumulated other comprehensive income (585 ) Period change (110 ) Balance at December 31, 2017 $ 1,091
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	Amount Reclassified from Accumulated Other Affected Line Item in Comprehensive Income the Statement Where (Dollars in thousands) (a) Net Income is Details about other comprehensive income December 31, 2017 Presented Unrealized gains on available-for-sale securities $ 886 Investment securities gains, net (301 ) Income taxes $ 585 Affected Line Item in the Statement Where (Dollars in thousands) Net Income is Details about other comprehensive income December 31, 2016 Presented Unrealized gains on available-for-sale securities $ 303 Investment securities gains, net (103 ) Income taxes $ 200 Affected Line Item in the Statement Where (Dollars in thousands) Net Income is Details about other comprehensive income December 31, 2015 Presented Unrealized gains on available-for-sale securities $ 323 Investment securities gains, net (110 ) Income taxes $ 213

Note 20 - Business Acquisition

Note 20 - Business Acquisition (Tables)	12 Months Ended
	Dec. 31, 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 shares $ 38.55 Purchase price assigned to Liberty common shares exchanged for Middlefield Banc Corp. shares 20,995 Purchase Price Consideration in Cash Purchase price assigned to Liberty common shares exchanged for cash 21,173 Total Purchase Price 42,168 Previously held equity interest in Liberty 1,068 Net Assets Acquired: Liberty shareholders equity $ 30,474 Adjustments to reflect assets acquired at fair value: Loans Allowance for loan loss 3,257 Loans - interest rate 578 Loans - general credit (2,161 ) Core deposit intangible 3,087 Other 254 Adjustments to reflect liabilities acquired at fair value: Time deposits (141 ) Deferred taxes (906 ) Change in control (1,718 ) Total net assets acquired 32,724 Goodwill resulting from merger $ 10,512
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 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 Other assets 997 Time deposits (30,744 ) Non-time deposits (167,300 ) Accrued interest payable (47 ) Deferred taxes (906 ) Other liabilities (2,754 ) Total net assets acquired 32,724 Goodwill resulting from the Liberty merger $ 10,512
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	2018 $ 352 2019 341 2020 332 2021 321 2022 309 Thereafter 1,094 Total $ 2,749
Business Acquisition, Pro Forma Information [Table Text Block]	Actual from Acquisition Date Through December 31, 2017 (in thousands) Net interest income $ 10,354 Noninterest income $ 744 Net income $ 2,625 Pro Formas Twelve-month period ended December 31, 2017 2016 (in thousands, except per share data) Net interest income $ 37,646 $ 34,817 Noninterest income 4,920 5,485 Net income $ 8,438 $ 8,692 Pro forma earnings per share: Basic $ 2.79 $ 4.12 Diluted $ 2.77 $ 4.10
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 2018 $ 352 2019 341 2020 332 2021 321 2022 309 Thereafter 1,094 $ 2,749

Note 21 - Parent Company (Table

Note 21 - Parent Company (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Condensed Balance Sheet [Table Text Block]	(Dollar amounts in thousands) December 31, 2017 2016 ASSETS Cash and due from banks $ 1,766 $ 2,543 Investment securities available for sale 625 1,139 Investment in nonbank subsidiary 2,363 2,360 Investment in subsidiary bank 119,946 76,365 Other assets 3,450 2,837 TOTAL ASSETS $ 128,150 $ 85,244 LIABILITIES Trust preferred securities $ 8,248 $ 8,248 Other liabilities 39 36 TOTAL LIABILITIES 8,287 8,284 STOCKHOLDERS' EQUITY 119,863 76,960 TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY $ 128,150 $ 85,244
Condensed Income Statement [Table Text Block]	Year Ended December 31, (Dollar amounts in thousands) 2017 2016 2015 INCOME Dividends from subsidiary bank $ 10,425 $ 3,400 $ 4,023 Gain on sale of investment securities 488 - - Other 80 24 19 Total income 10,993 3,424 4,042 EXPENSES Interest expense 460 366 290 Other 2,091 1,856 860 Total expenses 2,551 2,222 1,150 Income before income tax benefit 8,442 1,202 2,892 Income tax benefit (673 ) (561 ) (386 ) Income before equity in undistributed net income of subsidiaries 9,115 1,763 3,278 Equity in undistributed net income of subsidiaries 340 4,653 3,587 NET INCOME $ 9,455 $ 6,416 $ 6,865 Comprehensive Income $ 9,345 $ 5,222 $ 6,712
Condensed Cash Flow Statement [Table Text Block]	Year Ended December 31 , (Dollar amounts in thousands ) 201 7 201 6 201 5 OPERATING ACTIVITIE S Net incom e $ 9,455 $ 6,416 $ 6,865 Adjustments to reconcile net income to : Equity in undistributed net income of Middlefield Banking Compan y (337 ) (4,710 ) (3,703 ) Equity in undistributed net O (3 ) 57 116 Stock-based compensation expens e 33 29 18 Gain on sale of investment securitie s (488 ) - - Other, ne t 282 (484 ) (503 ) Net cash provided by operating activitie s 8,942 1,308 2,793 INVESTING ACTIVITIES Acquisition, net of cash paid (22,249 ) - - FINANCING ACTIVITIE S Net (decrease) increase in short-term borrowing s - (9,499 ) 6,363 Purchase of treasury stoc k - - (6,784 ) Proceeds from issuance of common stoc k 15,164 11,210 - Stock options exercise d 184 (6 ) (7 ) Proceeds from dividend reinvestment pla n 540 519 651 Cash dividend s (3,358 ) (2,318 ) (2,153 ) Net cash used for financing activitie s 12,530 (94 ) (1,930 ) Increase (decrease) in cash (777 ) 1,214 863 CASH AT BEGINNING OF YEA R 2,543 1,329 466 CASH AT END OF YEA R $ 1,766 $ 2,543 $ 1,329 SUPPLEMENTAL INFORMATION Common stock issued in business acquisition $ 20,995 $ - $ -

Note 22 - Selected Quarterly 50

Note 22 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Quarterly Financial Information [Table Text Block]	(Dollar amounts in thousands) Three Months Ended March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Total interest and dividend income $ 10,199 $ 10,902 $ 11,330 $ 11,564 Total interest expense 1,442 1,625 1,818 1,762 Net interest income 8,757 9,277 9,512 9,802 Provision for loan losses 165 170 280 430 Net interest income after provision for loan losses 8,592 9,107 9,232 9,372 Total noninterest income 1,511 989 1,441 918 Total noninterest expense 7,267 6,704 7,297 6,217 Income before income taxes 2,836 3,392 3,376 4,073 Income taxes 736 885 914 1,687 Net income $ 2,100 $ 2,507 $ 2,462 $ 2,386 Per share data: Net income Basic $ 0.78 $ 0.84 $ 0.77 $ 0.73 Diluted 0.78 0.83 0.76 0.73 Average shares outstanding: Basic 2,679,816 3,000,451 3,212,335 3,215,300 Diluted 2,692,015 3,014,140 3,223,753 3,231,791 (Dollar amounts in thousands) Three Months Ended March 31, June 30, September 30, December 31, 2016 2016 2016 2016 Total interest and dividend income $ 7,348 $ 7,405 $ 7,420 $ 7,821 Total interest expense 1,025 1,066 1,026 1,073 Net interest income 6,323 6,339 6,394 6,748 Provision for loan losses 105 105 105 255 Net interest income after provision for loan losses 6,218 6,234 6,289 6,493 Total noninterest income 909 1,173 977 900 Total noninterest expense 5,338 4,915 5,662 4,957 Income before income taxes 1,789 2,492 1,604 2,436 Income taxes 302 566 261 776 Net income $ 1,487 $ 1,926 $ 1,343 $ 1,660 Per share data: Net income Basic $ 0.79 $ 0.94 $ 0.60 $ 0.71 Diluted 0.79 0.94 0.60 0.70 Average shares outstanding: Basic 1,878,177 2,051,137 2,247,587 2,251,412 Diluted 1,886,943 2,059,411 2,256,230 2,264,712

Note 23 - Return on Equity an51

Note 23 - Return on Equity and Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Notes Tables
Schedule of Return on Equity and Assets [Table Text Block]	(Dollars in thousands) 2017 2016 2015 Average total assets $ 1,069,656 $ 757,052 $ 710,271 Average shareholders' equity $ 110,966 $ 68,741 $ 64,655 Net income $ 9,455 $ 6,416 $ 6,865 Net income available to common shareholders $ 9,455 $ 6,416 $ 6,865 Cash dividends declared per share $ 1.08 $ 1.08 $ 1.07 Return on average total assets 0.88 % 0.85 % 0.97 % Return on average shareholders' equity 8.52 % 9.33 % 10.62 % Dividend payout ratio (1) 35.52 % 36.18 % 31.36 % Average shareholders' equity to average assets 10.37 % 9.08 % 9.10 %

Note 1 - Summary of Significa52

Note 1 - Summary of Significant Accounting Policies (Details Textual)	Jan. 12, 2017USD ($)$ / sharesshares	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Number of Branches		14
Servicing Asset at Fair Value, Amount		$ 50,400,000	$ 39,900,000
Goodwill, Impairment Loss		$ 0	$ 0	$ 0
Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life		10 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life		20 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life		40 years
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Business Combination, Merger Agreement, Cash Per Share of Reporting Entity Common Stock | $ / shares	$ 37.96
Business Combination, Merger Agreement, Ratio of Shares of Reporting Entity's Common Stock for Each Share of Acquired Entity's Common Stock | shares	1.1934
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	544,610
Business Combination, Consideration Transferred	$ 42,168,000
Goodwill, Impairment Loss		$ 0

Note 2 - Earnings Per Share (De

Note 2 - Earnings Per Share (Details Textual) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	19,750	29,324	31,949
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 17.55	$ 17.55	$ 17.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 23	$ 37.48	$ 40.24
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0	4,699
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	23,635	11,357	9,154
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	14,601
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0
Employee Stock Option [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		29,324	27,250

Note 2 - Earnings Per Share - S

Note 2 - Earnings Per Share - Shares Used in Calculation of Earnings Per Share (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted-average common shares outstanding (in shares)									3,415,115	2,494,022	2,251,365
Average treasury stock shares (in shares)									(386,165)	(386,165)	(236,399)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	3,215,300	3,212,335	3,000,451	2,679,816	2,251,412	2,247,587	2,051,137	1,878,177	3,028,950	2,107,857	2,014,966
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									23,635	11,357	9,154
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	3,231,791	3,223,753	3,014,140	2,692,015	2,264,712	2,256,230	2,059,411	1,886,943	3,052,585	2,119,214	2,024,120

Note 3 - Investment Securitie55

Note 3 - Investment Securities Available for Sale (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities Pledged as Collateral	$ 57,900,000	$ 60,300,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	29
Available-for-sale Securities, Percentage of Portfolio	99.30%
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 0
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 488,000

Note 3 - Investment Securitie56

Note 3 - Investment Securities Available for Sale - Amortized Cost and Fair Values of Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized cost	$ 93,631	$ 112,557
Gross unrealized gains	2,048	2,702
Gross unrealized losses	(396)	(883)
Investment securities available for sale, at fair value	95,283	114,376
US Government Agencies Debt Securities [Member]
Amortized cost	8,664	10,158
Gross unrealized gains	126	174
Gross unrealized losses	(71)	(96)
Investment securities available for sale, at fair value	8,719	10,236
US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale, at fair value	67,429	81,223
US States and Political Subdivisions Debt Securities [Member] | Taxable [Member]
Amortized cost	504	1,615
Gross unrealized gains	8	129
Gross unrealized losses		(4)
Investment securities available for sale, at fair value	512	1,740
US States and Political Subdivisions Debt Securities [Member] | Tax Exempt [Member]
Amortized cost	65,408	78,327
Gross unrealized gains	1,547	1,678
Gross unrealized losses	(38)	(522)
Investment securities available for sale, at fair value	66,917	79,483
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	18,640	20,128
Gross unrealized gains	157	202
Gross unrealized losses	(287)	(261)
Investment securities available for sale, at fair value	18,510	20,069
Debt Securities [Member]
Amortized cost	93,216	111,807
Gross unrealized gains	1,838	2,313
Gross unrealized losses	(396)	(883)
Investment securities available for sale, at fair value	94,658	113,237
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized cost		1,579
Gross unrealized gains		130
Gross unrealized losses
Investment securities available for sale, at fair value		1,709
Equity Securities In Financial Institutions [Member]
Amortized cost	415	750
Gross unrealized gains	210	389
Gross unrealized losses
Investment securities available for sale, at fair value	$ 625	$ 1,139

Note 3 - Investment Securitie57

Note 3 - Investment Securities Available for Sale - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) $ in Thousands	Dec. 31, 2017USD ($)
Due in one year or less, amortized costs	$ 2,340
Due in one year or less, fair value	2,377
Due after one year through five years, amortized costs	9,718
Due after one year through five years, fair value	9,878
Due after five years through ten years, amortized costs	10,992
Due after five years through ten years, fair value	11,012
Due after ten years, amortized costs	70,166
Due after ten years, fair value	71,391
Amortized costs	93,216
Fair Value	$ 94,658

Note 3 - Investment Securitie58

Note 3 - Investment Securities Available for Sale - Sales of Available for Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Proceeds from sales	$ 6,474		$ 9,063	$ 15,686
Gross realized gains	911	[1]	309	440
Gross realized losses	$ (25)		$ (6)	$ (117)
[1]	Prior to the acquisition of Liberty, the Company had a previously held equity interest in Liberty which was re-measured at fair value on the acquisition date and resulted in a gain of $488,000, which was recorded in Investment Securities Gains on the consolidated Income Statement for the year ended December 31, 2017.

Note 3 - Investment Securitie59

Note 3 - Investment Securities Available for Sale - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Less than Twelve Months, Fair Value	$ 7,264	$ 36,925
Less than Twelve Months, Gross Unrealized Losses	(81)	(699)
Twelve Months or Greater, Fair Value	15,554	5,754
Twelve Months or Greater, Gross Unrealized Losses	(315)	(184)
Total, Fair Value	22,818	42,679
Total, Gross Unrealized Losses	(396)	(883)
US Government Agencies Debt Securities [Member]
Less than Twelve Months, Fair Value	557	3,803
Less than Twelve Months, Gross Unrealized Losses	(4)	(47)
Twelve Months or Greater, Fair Value	4,036	1,316
Twelve Months or Greater, Gross Unrealized Losses	(67)	(49)
Total, Fair Value	4,593	5,119
Total, Gross Unrealized Losses	(71)	(96)
US States and Political Subdivisions Debt Securities [Member] | Tax Exempt [Member]
Less than Twelve Months, Fair Value	1,009	23,554
Less than Twelve Months, Gross Unrealized Losses	(6)	(522)
Twelve Months or Greater, Fair Value	2,784	0
Twelve Months or Greater, Gross Unrealized Losses	(32)
Total, Fair Value	3,793	23,554
Total, Gross Unrealized Losses	(38)	(522)
US States and Political Subdivisions Debt Securities [Member] | Taxable [Member]
Less than Twelve Months, Fair Value		502
Less than Twelve Months, Gross Unrealized Losses		(4)
Twelve Months or Greater, Fair Value
Twelve Months or Greater, Gross Unrealized Losses
Total, Fair Value		502
Total, Gross Unrealized Losses		(4)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Less than Twelve Months, Fair Value	5,698	9,066
Less than Twelve Months, Gross Unrealized Losses	(71)	(126)
Twelve Months or Greater, Fair Value	8,734	4,438
Twelve Months or Greater, Gross Unrealized Losses	(216)	(135)
Total, Fair Value	14,432	13,504
Total, Gross Unrealized Losses	$ (287)	$ (261)

Note 4 - Loans and Related Al60

Note 4 - Loans and Related Allowance for Loan and Lease Losses (Details Textual)	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Loans and Leases Receivable, Deferred Income	$ 1,500,000	$ 1,700,000
Financing Receivable, Modifications, Recorded Investment	5,400,000	6,700,000
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 509,000	436,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0
Number of Days Past Due	90 years
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$ 437,000	309,000	$ 259,000
Provision for Loan, Lease, and Other Losses	1,045,000	$ 570,000	$ 315,000
Threshold For Loans Evaluated For Impairment [Member]
Loans and Leases Receivable, before Fees, Gross	1,000,000
Threshold For Loans Evaluated For Impairment [Member] | Outside Consultant [Member]
Loans and Leases Receivable, before Fees, Gross	250,000
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member]
Financing Receivable, Gross	125,000
Residential Loan [Member] | Real Estate Mortgage Portfolio Segment [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		4
Provision for Loan, Lease, and Other Losses	$ (1,182,000)	$ (48,000)

Note 4 - Loans and Related Al61

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Major Classifications of Net Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Gross	$ 923,213	$ 609,140
Less: Allowance for loan and lease losses	(7,190)	(6,598)	$ (6,385)
Net loans	916,023	602,542
Commercial And Industrial [Member]
Financing Receivable Gross	101,346	60,630
Less: Allowance for loan and lease losses	(999)	(448)	(867)
Real Estate Construction Porfolio Segment [Member]
Financing Receivable Gross	47,017	23,709
Less: Allowance for loan and lease losses	(313)	(172)	(276)
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Financing Receivable Gross	318,157	270,830
Less: Allowance for loan and lease losses	(1,760)	(2,818)	(3,139)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivable Gross	437,947	249,490
Less: Allowance for loan and lease losses	(4,036)	(3,135)	(2,078)
Consumer Portfolio Segment [Member]
Financing Receivable Gross	18,746	4,481
Less: Allowance for loan and lease losses	$ (82)	$ (25)	$ (25)

Note 4 - Loans and Related Al62

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Primary Segments of the Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Individually evaluated for impairment	$ 12,109	$ 12,430
Collectively evaluated for impairment	911,104	596,710
Total loans	923,213	609,140
Commercial And Industrial [Member]
Individually evaluated for impairment	3,627	1,190
Collectively evaluated for impairment	97,719	59,440
Total loans	101,346	60,630
Real Estate Construction Porfolio Segment [Member]
Individually evaluated for impairment	44	913
Collectively evaluated for impairment	46,973	22,796
Total loans	47,017	23,709
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Individually evaluated for impairment	2,824	3,135
Collectively evaluated for impairment	315,333	267,695
Total loans	318,157	270,830
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Individually evaluated for impairment	5,610	7,187
Collectively evaluated for impairment	432,337	242,303
Total loans	437,947	249,490
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	4	5
Collectively evaluated for impairment	18,742	4,476
Total loans	$ 18,746	$ 4,481

Note 4 - Loans and Related Al63

Note 4 - Loans and Related Allowance of Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Individually evaluated for impairment				$ 1,567	$ 527
Collectively evaluated for impairment				5,623	6,071
Total ending allowance balance	$ 7,190	$ 6,598	$ 6,385	7,190	6,598
ALLL balance, period start	6,598	6,385
Charge-offs	(1,154)	(743)
Recoveries	701	386
Provision for Loan, Lease, and Other Losses	1,045	570	315
ALLL balance, period end	7,190	6,598	6,385
Commercial And Industrial [Member]
Individually evaluated for impairment				694	90
Collectively evaluated for impairment				305	358
Total ending allowance balance	999	448	867	999	448
ALLL balance, period start	448	867
Charge-offs	(536)	(237)
Recoveries	234	90
Provision for Loan, Lease, and Other Losses	853	(272)
ALLL balance, period end	999	448	867
Real Estate Construction Porfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment				313	172
Total ending allowance balance	313	172	276	313	172
ALLL balance, period start	172	276
Charge-offs
Recoveries	34
Provision for Loan, Lease, and Other Losses	107	(104)
ALLL balance, period end	313	172	276
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Individually evaluated for impairment				140	251
Collectively evaluated for impairment				1,620	2,567
Total ending allowance balance	1,760	2,818	3,139	1,760	2,818
ALLL balance, period start	2,818	3,139
Charge-offs	(117)	(414)
Recoveries	241	141
Provision for Loan, Lease, and Other Losses	(1,182)	(48)
ALLL balance, period end	1,760	2,818	3,139
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Individually evaluated for impairment				733	186
Collectively evaluated for impairment				3,303	2,949
Total ending allowance balance	4,036	3,135	2,078	4,036	3,135
ALLL balance, period start	3,135	2,078
Charge-offs	(39)	(70)
Recoveries	111	140
Provision for Loan, Lease, and Other Losses	829	987
ALLL balance, period end	4,036	3,135	2,078
Consumer Portfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment				82	25
Total ending allowance balance	82	25	25	$ 82	$ 25
ALLL balance, period start	25	25
Charge-offs	(462)	(22)
Recoveries	81	15
Provision for Loan, Lease, and Other Losses	438	7
ALLL balance, period end	$ 82	$ 25	$ 25

Note 4 - Loans and Related Al64

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Impaired Loans by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Recorded investment, with no related allowance	$ 4,053	$ 5,405
Unpaid principal balance, with no related allowance	4,942	5,394
Recorded investment, with related allowance	8,056	7,025
Unpaid principal balance, with related allowance	8,980	7,011
Related allowance	1,567	527
Recorded investment	12,109	12,430
Unpaid principal balance	13,922	12,405
Commercial Loans [Member]
Recorded investment, with related allowance	3,740
Unpaid principal balance, with related allowance	3,913
Related allowance	733
Commercial And Industrial [Member]
Recorded investment, with no related allowance	450	319
Unpaid principal balance, with no related allowance	1,006	318
Recorded investment, with related allowance	3,177	871
Unpaid principal balance, with related allowance	3,888	868
Related allowance	694	90
Recorded investment	3,627	1,190
Unpaid principal balance	4,894	1,186
Real Estate Construction Porfolio Segment [Member]
Recorded investment, with no related allowance	44	913
Unpaid principal balance, with no related allowance	44	909
Recorded investment, with related allowance	44	913
Unpaid principal balance, with related allowance	44	909
Related allowance
Real Estate Construction Porfolio Segment [Member] | Residential Loan [Member]
Recorded investment, with related allowance	1,139
Unpaid principal balance, with related allowance	1,179
Related allowance	140
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Recorded investment, with no related allowance	1,685	2,142
Unpaid principal balance, with no related allowance	1,904	2,140
Recorded investment, with related allowance		993
Unpaid principal balance, with related allowance		991
Related allowance	140	251
Recorded investment	2,824	3,135
Unpaid principal balance	3,083	3,131
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Recorded investment, with no related allowance	1,870	2,031
Unpaid principal balance, with no related allowance	1,984	2,027
Recorded investment, with related allowance		5,156
Unpaid principal balance, with related allowance		5,147
Related allowance	733	186
Recorded investment	5,610	7,187
Unpaid principal balance	5,897	7,174
Consumer Portfolio Segment [Member]
Recorded investment, with no related allowance		5
Unpaid principal balance, with no related allowance		5
Recorded investment, with related allowance	4	5
Unpaid principal balance, with related allowance	4	$ 5
Related allowance
Recorded investment	4
Unpaid principal balance	$ 4

Note 4 - Loans and Related Al65

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Additional Information on Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Average recorded investment	$ 12,836	$ 13,411	$ 13,440
Interest income recognized	715	509	725
Commercial And Industrial [Member]
Average recorded investment	2,378	1,211	1,468
Interest income recognized	178	32	100
Real Estate Construction Porfolio Segment [Member]
Average recorded investment	565	1,281	2,407
Interest income recognized	1	10	115
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Average recorded investment	3,068	3,529	4,356
Interest income recognized	89	98	160
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Average recorded investment	6,820	7,384	5,203
Interest income recognized	446	368	350
Consumer Portfolio Segment [Member]
Average recorded investment	5	6	6
Interest income recognized	$ 1	$ 1

Note 4 - Loans and Related Al66

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Troubled Debt Restructurings (Details)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Commercial And Industrial [Member]
Number of contracts	6	4	5
Pre-modification outstanding recorded investment	$ 434,000	$ 127,000	$ 610,000
Post-modification outstanding recorded investment	$ 434,000	$ 127,000	$ 610,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Number of contracts	6	5	4
Pre-modification outstanding recorded investment	$ 515,000	$ 256,000	$ 166,000
Post-modification outstanding recorded investment	$ 535,000	$ 256,000	166,000
Real Estate Construction Porfolio Segment [Member]
Number of contracts	1
Pre-modification outstanding recorded investment	$ 181,000
Post-modification outstanding recorded investment	$ 181,000		$ 1
Commercial Real Estate Portfolio Segment [Member]
Number of contracts	1		1
Pre-modification outstanding recorded investment	$ 270,000		$ 311,000
Post-modification outstanding recorded investment	$ 270,000		$ 311,000
Extended Maturity [Member] | Commercial And Industrial [Member]
Number of contracts	6	4	5
Extended Maturity [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Number of contracts	5	5	4
Extended Maturity [Member] | Real Estate Construction Porfolio Segment [Member]
Number of contracts	1
Extended Maturity [Member] | Commercial Real Estate Portfolio Segment [Member]
Number of contracts	1		1
Other Restructurings [Member] | Commercial And Industrial [Member]
Number of contracts
Other Restructurings [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Number of contracts	1
Other Restructurings [Member] | Real Estate Construction Porfolio Segment [Member]
Number of contracts
Other Restructurings [Member] | Commercial Real Estate Portfolio Segment [Member]
Number of contracts

Note 4 - Loans and Related Al67

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Troubled Debt Restructurings Subsequently Defaulted (Details)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		0
Commercial And Industrial [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			2	2
Recorded investment, subsequently defaulted			$ 7,000	$ 14,000
Number of contracts, subsequently defaulted	$ 434,000	$ 127,000	610,000
Real Estate Construction Porfolio Segment [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts				1
Recorded investment, subsequently defaulted				$ 130,000
Number of contracts, subsequently defaulted	181,000		$ 1
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			4
Recorded investment, subsequently defaulted			$ 278,000
Number of contracts, subsequently defaulted	535,000	$ 256,000	$ 166,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1
Recorded investment, subsequently defaulted			$ 119,000
Number of contracts, subsequently defaulted	$ 270,000		$ 311,000

Note 4 - Loans and Related Al68

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans, total	$ 923,213	$ 609,140
Commercial And Industrial [Member]
Loans, total	101,346	60,630
Real Estate Construction Porfolio Segment [Member]
Loans, total	47,017	23,709
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, total	318,157	270,830
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, total	437,947	249,490
Consumer Portfolio Segment [Member]
Loans, total	18,746	4,481
Pass [Member]
Loans, total	897,759	591,706
Pass [Member] | Commercial And Industrial [Member]
Loans, total	95,621	58,539
Pass [Member] | Real Estate Construction Porfolio Segment [Member]
Loans, total	46,995	23,541
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, total	312,176	264,481
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, total	424,225	240,678
Pass [Member] | Consumer Portfolio Segment [Member]
Loans, total	18,742	4,467
Special Mention [Member]
Loans, total	11,829	5,657
Special Mention [Member] | Commercial And Industrial [Member]
Loans, total	1,942	663
Special Mention [Member] | Real Estate Construction Porfolio Segment [Member]
Loans, total		144
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, total	723	428
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, total	9,164	4,422
Substandard [Member]
Loans, total	13,625	11,777
Substandard [Member] | Commercial And Industrial [Member]
Loans, total	3,783	1,428
Substandard [Member] | Real Estate Construction Porfolio Segment [Member]
Loans, total	22	24
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, total	5,258	5,921
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, total	4,558	4,390
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans, total	4	$ 14
Doubtful [Member]
Loans, total
Doubtful [Member] | Commercial And Industrial [Member]
Loans, total
Doubtful [Member] | Real Estate Construction Porfolio Segment [Member]
Loans, total
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, total
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, total

Note 4 - Loans and Related Al69

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans, current balance	$ 915,131	$ 605,703
Loans, past due	8,082	3,437
Loans, total	923,213	609,140
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, past due	5,501	2,018
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, past due	257	219
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	2,324	1,200
Commercial And Industrial [Member]
Loans, current balance	99,633	60,407
Loans, past due	1,713	223
Loans, total	101,346	60,630
Commercial And Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, past due	1,607	17
Commercial And Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, past due	29	2
Commercial And Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	77	204
Real Estate Construction Porfolio Segment [Member]
Loans, current balance	47,017	23,709
Loans, past due	0	0
Loans, total	47,017	23,709
Real Estate Construction Porfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, past due	0	0
Real Estate Construction Porfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, past due	0	0
Real Estate Construction Porfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	0	0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, current balance	314,866	268,041
Loans, past due	3,291	2,789
Loans, total	318,157	270,830
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, current balance	434,879	249,081
Loans, past due	3,068	409
Loans, total	437,947	249,490
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Loan [Member]
Loans, past due	1,977	1,909
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans [Member]
Loans, past due	1,907	92
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Loan [Member]
Loans, past due	227	207
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans [Member]
Loans, past due	1
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Loan [Member]
Loans, past due	1,087	673
Real Estate Mortgage Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member]
Loans, past due	1,160	317
Consumer Portfolio Segment [Member]
Loans, current balance	18,736	4,465
Loans, past due	10	16
Loans, total	18,746	4,481
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, past due	10
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, past due		10
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due		$ 6

Note 4 - Loans and Related Al70

Note 4 - Loans and Related Allowance for Loan and Lease Losses - Classes of the Loan Portfolio Summarized by Nonaccrual Loans and Still Accruing (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans, nonacrrual status	$ 8,433	$ 5,903
Loans, 90+ days past due and accruing	0	0
Commercial And Industrial [Member]
Loans, nonacrrual status	1,120	454
Loans, 90+ days past due and accruing	0	0
Real Estate Construction Porfolio Segment [Member]
Loans, nonacrrual status
Loans, 90+ days past due and accruing	0	0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans, nonacrrual status	4,002	4,034
Loans, 90+ days past due and accruing	0	0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Loans, nonacrrual status	3,311	1,409
Loans, 90+ days past due and accruing	0	0
Consumer Portfolio Segment [Member]
Loans, nonacrrual status		6
Loans, 90+ days past due and accruing	$ 0	$ 0

Note 5 - Other Real Estate Ow71

Note 5 - Other Real Estate Owned ("OREO") (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Real Estate Acquired Through Foreclosure	$ 212,000	$ 934,000
Mortgage Loans in Process of Foreclosure, Amount	$ 1,500,000

Note 6 - Premises and Equipme72

Note 6 - Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Depreciation	$ 876,000,000,000	$ 735,000	$ 715,000

Note 6 - Premises and Equipme73

Note 6 - Premises and Equipment - Major Classifications of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Land and land improvements	$ 2,920	$ 2,891
Building and leasehold improvements	14,277	12,081
Furniture, fixtures, and equipment	7,010	5,404
Total premises and equipment	24,207	20,376
Less accumulated depreciation and amortization	12,354	9,173
Total premises and equipment, net	$ 11,853	$ 11,203

Note 7 - Goodwill and Intangi74

Note 7 - Goodwill and Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill	$ 15,071,000	$ 4,559,000
Finite-Lived Core Deposits, Gross	2,700,000	36,000
Amortization of Intangible Assets	374,000	40,000	$ 40,000
Core Deposits [Member]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 692,000	318,000
Finite-Lived Intangible Asset, Useful Life	10 years
Amortization of Intangible Assets		$ 40,000

Note 7 - Goodwill and Intangi75

Note 7 - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total	$ 2,749	$ 36
Core Deposits [Member]
2,018	352
2,019	341
2,020	332
2,021	321
2,022	309
Thereafter	1,094
Total	$ 2,749

Note 8 - Other Assets - Compone

Note 8 - Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Restricted stock	$ 3,589	$ 2,204
Deferred tax asset, net	647	1,607
Other	1,620	1,265
Total	9,144	7,502
Investment Securities [Member]
Accrued interest	707	812
Loans [Member]
Accrued interest	$ 2,581	$ 1,614

Note 9 - Deposits (Details Text

Note 9 - Deposits (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Time Deposit Maturities, Next Twelve Months	$ 99.3
Time Deposit Maturities, Year Two	21.5
Time Deposit Maturities, Year Three	51.8
Time Deposit Maturities, Year Four	41
Time Deposit Maturities, Year Five	29.4
Time Deposits, at or Above FDIC Insurance Limit	$ 39.4	$ 27.8

Note 10 - Short-term Borrowin78

Note 10 - Short-term Borrowings (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility, Maximum Borrowing Capacity	$ 6,000,000	$ 10,000,000	$ 4,000,000
Line of Credit Facility, Interest Rate During Period	4.75%	4.69%	4.74%
Long-term Line of Credit	$ 0	$ 0	$ 9,500,000

Note 10 - Short-term Borrowin79

Note 10 - Short-term Borrowings - Outstanding Balances and Related Information of Short-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Balance at year-end	$ 74,707	$ 68,359
Average balance outstanding	63,910	37,130
Maximum month-end balance	$ 114,025	$ 68,359
Weighted-average rate at year-end	1.36%	0.61%
Weighted-average rate during the year	1.18%	0.89%

Note 10 - Short-term Borrowin80

Note 10 - Short-term Borrowings - Repurchase Agreements (Details) - Overnight and Continuous [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Repurchase agreements	$ 1,989	$ 2,129
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Repurchase agreements	2,040	2,667
US States and Political Subdivisions Debt Securities [Member]
Repurchase agreements	495	968
US Government Agencies Debt Securities [Member]
Repurchase agreements	$ 2,535	$ 3,635

Note 11 - Other Borrowings (Det

Note 11 - Other Borrowings (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2006	Dec. 31, 2017	Dec. 31, 2016
Annual Paydown of Principal Required		20.00%
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds		$ 192,200,000
Stock Issued During Period, Value, New Issues	$ 248,000	15,164,000	$ 11,210,000
Notes Payable	$ 8,300,000
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.67%
Mandatorily Redeemable Securities [Member] | Special Purpose Entity [Member]
Securities Sold under Agreements to Repurchase		$ 8,000,000

Note 11 - Other Borrowings - Ot

Note 11 - Other Borrowings - Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Weighted-average rate during the year	1.18%	0.89%
Other borrowings	$ 29,065	$ 9,437
Fixed Rate Amortizing [Member]
Maturity range, minimum	Feb. 1, 2018
Maturity range, maximum	Oct. 1, 2028
Weighted-average rate during the year	1.24%
Other borrowings	$ 20,817	1,189
Fixed Rate Amortizing [Member] | Minimum [Member]
Stated interest rate	1.01%
Fixed Rate Amortizing [Member] | Maximum [Member]
Stated interest rate	4.47%
Junior Subordinated Debt [Member]
Maturity range, minimum	Dec. 21, 2037
Maturity range, maximum	Dec. 21, 2037
Weighted-average rate during the year	2.85%
Other borrowings	$ 8,248	$ 8,248
Junior Subordinated Debt [Member] | Minimum [Member]
Stated interest rate	2.56%
Junior Subordinated Debt [Member] | Maximum [Member]
Stated interest rate	3.05%

Note 11 - Other Borrowings - Ma

Note 11 - Other Borrowings - Maturities of Other Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
2018, amount	$ 20,252
2018, weighted-average interest rate	1.16%
2019, amount	$ 155
2019, weighted-average interest rate	4.04%
2020, amount	$ 116
2020, weighted-average interest rate	4.04%
2021, amount	$ 87
2021, weighted-average interest rate	4.04%
2,022	$ 65
2,022	4.04%
Beyond 2021, amount	$ 8,390
Beyond 2021, weighted-average interest rate	2.79%
Total, amount	$ 29,065	$ 9,437
Total, weighted-average interest rate	2.86%

Note 12 - Other Liabilities - C

Note 12 - Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued interest payable	$ 578	$ 395
Supplemental Executive Retirement Plan	1,427	1,125
Accrued salary expense	956	768
Other	1,546	843
Total	$ 4,507	$ 3,131

Note 13 - Income Taxes (Details

Note 13 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets, Valuation Allowance	$ 0	$ 0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	401,000
Unrecognized Tax Benefits	$ 0	$ 0

Note 13 - Income Taxes - The Pr

Note 13 - Income Taxes - The Provision (Benefit) for Federal Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current payable									$ 3,929	$ 1,998	$ 1,004
Deferred income taxes									293	(93)	558
Total provision	$ 1,687	$ 914	$ 885	$ 736	$ 776	$ 261	$ 566	$ 302	$ 4,222	$ 1,905	$ 1,562

Note 13 - Income Taxes - Deferr

Note 13 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for loan and lease losses	$ 1,210	$ 2,243
Supplemental retirement plan	528	382
Investment security basis adjustment	18	66
Nonaccrual interest income	371	456
OREO adjustments	2	26
Accrued compensation	201	261
Other	86	82
Gross deferred tax assets	2,416	3,516
Deferred tax liabilities:
Premises and equipment	356	445
Net unrealized gain on securities	347	618
FHLB stock dividends	139	225
Intangibles	307	449
Mortgage servicing rights	71	103
Deferred origination fees, net	294	63
Acquisition fair value adjustments	250	1
Other	5	5
Gross deferred tax liabilities	1,769	1,909
Net deferred tax assets	$ 647	$ 1,607

Note 13 - Income Taxes - Tax Ra

Note 13 - Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Provision at statutory rate, amount									$ 4,651	$ 2,829	$ 2,866
Provision at statutory rate, percent									34.00%	34.00%	34.00%
Tax-exempt income, amount									$ (1,045)	$ (1,177)	$ (1,347)
Tax-exempt income, percent									(7.60%)	(14.10%)	(15.90%)
Nondeductible interest expense, amount									$ 32	$ 32	$ 34
Nondeductible interest expense, percent									0.20%	0.40%	0.40%
Nondeductible merger-related expense, amount									$ 43	$ 186
Nondeductible merger-related expense, percent									0.30%	2.20%
Stock-based compensation, amount									$ (50)
Stock-based compensation, percent									(0.40%)
Change in effective corporate tax rate, amount									$ 401
Change in effective corporate tax rate, percent									2.90%
Other, amount									$ 190	$ 35	$ 9
Other, percent									1.50%	0.40%
Total provision	$ 1,687	$ 914	$ 885	$ 736	$ 776	$ 261	$ 566	$ 302	$ 4,222	$ 1,905	$ 1,562
Actual tax expense and effective rate, percent									30.90%	22.90%	18.50%

Note 14 - Employee Benefits (De

Note 14 - Employee Benefits (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 538,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	8,237	500
Payments For Stock Options Exercised	$ (184,000)	$ 6,000	$ 7,000
Restricted Stock [Member]
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	0	0	0
Employee Stock Option [Member]
Payments For Stock Options Exercised	$ 95,000	$ 6,000
Restricted Stock Units (RSUs) [Member]
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	5,825	5,090	3,905
Allocated Share-based Compensation Expense	$ 196,000	$ 123,000	$ 55,000
Retirement Plan [Member]
Defined Contribution Plan Employer Voluntary Matching Bank Contribution	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	6 years
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 258,000	156,000	156,000
Retirement Plan [Member] | Middlefield Banking Company [Member]
Defined Contribution Plan Annual Vesting Percentage	20.00%
Retirement Plan [Member] | Liberty Bank, N.A. [Member]
Deferred Compensation Arrangement with Individual, Requisite Service Period	3 years
Directors Retirement Plan [Member] | Middlefield Banking Company [Member]
Deferred Compensation Arrangement with Individual, Requisite Service Period	5 years
Retirement Benefits Term	10 years
Postretirement Benefits Percentage of Compensation	25.00%
Executive Deferred Compensation Plan [Member] | Middlefield Banking Company [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 110,000	$ 99,000	$ 65,000
Stock Option and Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	160,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	10 years
Shares, Outstanding	92,759
The 2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	224,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	218,175
Omnibus Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0

Note 14 - Employee Benefits - P

Note 14 - Employee Benefits - Projected Benefit Payments (Details) $ in Millions	Dec. 31, 2017USD ($)
2,018	$ 18
2,019	12
2,020	10
2,021	2
Total	$ 42

Note 14 - Employee Benefits - S

Note 14 - Employee Benefits - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Outstanding, January 1 (in shares)	29,324	31,949
Outstanding, January 1 (in dollars per share)	$ 23.67
Expired (in shares)	(1,337)
Expired (in dollars per share)	$ 37.48
Exercised (in shares)	(8,237)	(500)
Exercised (in dollars per share)	$ 27.97
Outstanding, December 31 (in shares)	19,750	29,324
Outstanding, December 31 (in dollars per share)	$ 20.94	$ 23.67
Exercisable, December 31 (in shares)	19,750
Exercisable, December 31 (in dollars per share)	$ 20.94

Note 14 - Employee Benefits -92

Note 14 - Employee Benefits - Stock Options Outstanding by Grant Date (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding, shares (in shares)	19,750	29,324	31,949
Outstanding, weighted average exercise price (in dollars per share)	$ 20.94	$ 23.67
Exercisable, December 31 (in shares)	19,750
Exercisable, December 31 (in dollars per share)	$ 20.94
Exercise Price Range 1 [Member]
Exercise price (in dollars per share)	$ 23
Outstanding, shares (in shares)	12,300
Outstanding, contractual average life (Year)	310 days
Outstanding, weighted average exercise price (in dollars per share)	$ 23
Exercisable, December 31 (in shares)	12,300
Exercisable, December 31 (in dollars per share)	$ 23
Exercise Price Range 2 [Member]
Exercise price (in dollars per share)	$ 17.55
Outstanding, shares (in shares)	7,450
Outstanding, contractual average life (Year)	3 years 127 days
Outstanding, weighted average exercise price (in dollars per share)	$ 17.55
Exercisable, December 31 (in shares)	7,450
Exercisable, December 31 (in dollars per share)	$ 17.55
Exercise Price Range 3 [Member]
Exercise price (in dollars per share)
Outstanding, shares (in shares)	19,750
Outstanding, contractual average life (Year)
Outstanding, weighted average exercise price (in dollars per share)
Exercisable, December 31 (in shares)	19,750
Exercisable, December 31 (in dollars per share)

Note 14 - Employee Benefits - A

Note 14 - Employee Benefits - Activity Related to Restricted Stock Units Awarded (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Nonvested (in shares) | shares	8,995
Nonvested (in dollars per share) | $ / shares	$ 32.93
Granted, units (in shares) | shares	5,825
Granted, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 38.70
Forfeited, units (in shares) | shares	(219)
Forfeited, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 38.70
Nonvested (in shares) | shares	14,601
Nonvested (in dollars per share) | $ / shares	$ 35.14
Expected to vest (in shares) | shares	14,601
Expected to vest, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 35.14

Note 15 - Commitments (Details

Note 15 - Commitments (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leases, Rent Expense	$ 641,000	$ 285,000	$ 288,000

Note 15 - Commitments - Outstan

Note 15 - Commitments - Outstanding Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments	$ 235,038	$ 163,062
Commitments to Extend Credit [Member]
Commitments	234,023	161,646
Financial Standby Letter of Credit [Member]
Commitments	$ 1,015	$ 1,416

Note 15 - Commitments - Future

Note 15 - Commitments - Future Payments Under Operating Leases (Details) $ in Thousands	Dec. 31, 2017USD ($)
2,018	$ 655
2,019	639
2,020	641
2,021	598
2,022	365
Thereafter	920
Total	$ 3,818

Note 16 - Regulatory Restrict97

Note 16 - Regulatory Restrictions (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Reserves Required by Federal Reserve Bank	$ 15.8	$ 2.9
Percent of Common Stock	10.00%
Amount Available for Payment of Dividends	$ 5.1

Note 17 - Regulatory Capital (D

Note 17 - Regulatory Capital (Details Textual)	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2019
Capital Conservation Buffer Phase in Amount	0.625%
Capital Conservation Buffer Phase-in Number of Years	4 years
Scenario, Forecast [Member]
Capital Conservation Buffer Maximum Percentage		2.50%

Note 17 - Regulatory Capital -

Note 17 - Regulatory Capital - Capital Ratios (Details)	Dec. 31, 2017	Dec. 31, 2016
Leverage capital, adequately capitalized, ratio	4.00%	4.00%
Tier 1 risk based capital, adequately capitalized, ratio	6.00%	6.00%
Common equity tier 1 capital, adequately capitalized, ratio	4.50%	4.50%
Total risk based capital, adequately capitalized, ratio	8.00%	8.00%
Leverage capital, adequately capitalized plus capital conservation buffer, ratio	4.00%	4.00%
Tier 1 risk based capital, adequately capitalized plus capital conservation buffer, ratio	8.50%	8.50%
Common equity tier 1 capital, adequately capitalized plus capital conservation buffer, ratio	7.00%	7.00%
Total risk based capital, adequately capitalized plus capital conservation buffer, ratio	10.50%	10.50%
Middlefield Banking Company [Member]
Leverage capital, actual, ratio	9.47%	9.29%
Tier 1 risk based capital, actual, ratio	10.88%	13.03%
Common equity tier 1 capital, actual, ratio	10.88%	13.03%
Total risk based capital, actual, ratio	11.64%	14.25%
Leverage capital, well-capitalized, ratio (bank only)	5.00%	5.00%
Tier 1 risk based capital, well-capitalized, ratio (bank only)	8.00%	8.00%
Common equity tier 1 capital, well-capitalized, ratio (bank only)	6.50%	6.50%
Total risk based capital, well-capitalized, ratio (bank only)	10.00%	10.00%
Middlefield Banc Corp [Member]
Leverage capital, actual, ratio	10.20%	9.27%
Tier 1 risk based capital, actual, ratio	11.64%	13.07%
Common equity tier 1 capital, actual, ratio	10.79%	13.07%
Total risk based capital, actual, ratio	12.41%	15.75%

Note 18 - Fair Value Disclos100

Note 18 - Fair Value Disclosure Measurements - Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment securities available for sale	$ 95,283	$ 114,376
US Government Agencies Debt Securities [Member]
Investment securities available for sale	8,719	10,236
US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale	67,429	81,223
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment securities available for sale	18,510	20,069
Debt Securities [Member]
Investment securities available for sale	94,658	113,237
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investment securities available for sale		1,709
Equity Securities In Financial Institutions [Member]
Investment securities available for sale	625	1,139
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Investment securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
Investment securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investment securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities In Financial Institutions [Member]
Investment securities available for sale
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available for sale	95,283	114,376
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Investment securities available for sale	8,719	10,236
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale	67,429	81,223
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment securities available for sale	18,510	20,069
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
Investment securities available for sale	94,658	113,237
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investment securities available for sale		1,709
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities In Financial Institutions [Member]
Investment securities available for sale	625	1,139
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Investment securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Investment securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
Investment securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investment securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities In Financial Institutions [Member]
Investment securities available for sale

Note 18 - Fair Value Disclos101

Note 18 - Fair Value Disclosure Measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Impaired loans	$ 12,109,000	$ 12,430,000
Other real estate owned	212,000	934,000
Estimate of Fair Value Measurement [Member]
Impaired loans	3,072,000	6,498,000
Other real estate owned	32,000	511,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans
Other real estate owned
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans
Other real estate owned
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Impaired loans	3,072,000	6,498,000
Other real estate owned	$ 32,000	$ 511,000

Note 18 - Fair Value Disclos102

Note 18 - Fair Value Disclosure Measurements - Additional Quantitative Information About Assets Measured at Fair Value on Non-recurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - Appraisal Adjustments [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Fair value estimate			$ 1,570
Valuation Techniques / Unobservable Input			Appraisal of collateral (1)
Minimum [Member]
Discount rate			0.00%
Maximum [Member]
Discount rate			59.70%
Weighted Average [Member]
Discount rate			28.20%
Impaired Loans [Member]
Fair value estimate		$ 3,072	$ 4,928
Valuation Techniques / Unobservable Input	[1],[2]	Appraisal of collateral / Appraisal adjustments	Discounted cash flow
Impaired Loans [Member] | Minimum [Member]
Discount rate		0.00%	3.10%
Impaired Loans [Member] | Maximum [Member]
Discount rate		86.10%	7.00%
Impaired Loans [Member] | Weighted Average [Member]
Discount rate			5.10%
Other Real Estate Owned [Member]
Fair value estimate		$ 32	$ 511
Valuation Techniques / Unobservable Input	[1],[2]	Appraisal of collateral / Appraisal adjustments	Appraisal of collateral / Appraisal adjustments
Other Real Estate Owned [Member] | Minimum [Member]
Discount rate		0.00%	0.00%
Other Real Estate Owned [Member] | Maximum [Member]
Discount rate			10.00%
Other Real Estate Owned [Member] | Weighted Average [Member]
Discount rate		10.00%
[1]	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
[2]	Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level III inputs which are not identifiable, less any associated allowance.

Note 18 - Fair Value Disclos103

Note 18 - Fair Value Disclosure Measurements - Estimated Fair Value of the Company's Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Investment securities available for sale	$ 95,283	$ 114,376
Reported Value Measurement [Member]
Financial assets:
Cash and cash equivalents	39,886	32,495
Investment securities available for sale	95,283	114,376
Loans held for sale	463	634
Net loans	916,023	602,542
Bank-owned life insurance	15,652	13,540
Federal Home Loan Bank stock	3,589	2,204
Accrued interest receivable	3,288	2,426
Financial liabilities:
Deposits	878,194	629,934
Short-term borrowings	74,707	68,359
Other borrowings	29,065	9,437
Accrued interest payable	578	395
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	39,886	32,495
Investment securities available for sale	95,283	114,376
Loans held for sale	463	634
Net loans	913,323	604,447
Bank-owned life insurance	15,652	13,540
Federal Home Loan Bank stock	3,589	2,204
Accrued interest receivable	3,288	2,426
Financial liabilities:
Deposits	877,227	630,371
Short-term borrowings	74,707	68,359
Other borrowings	29,069	9,512
Accrued interest payable	578	395
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	39,886	32,495
Investment securities available for sale
Loans held for sale
Net loans
Bank-owned life insurance	15,652	13,540
Federal Home Loan Bank stock	3,589	2,204
Accrued interest receivable	3,288	2,426
Financial liabilities:
Deposits	635,207	440,500
Short-term borrowings	74,707	68,359
Other borrowings
Accrued interest payable	578	395
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents
Investment securities available for sale	95,283	114,376
Loans held for sale	463	634
Net loans
Bank-owned life insurance
Federal Home Loan Bank stock
Accrued interest receivable
Financial liabilities:
Deposits
Short-term borrowings
Other borrowings
Accrued interest payable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents
Investment securities available for sale
Loans held for sale
Net loans	913,323	604,447
Bank-owned life insurance
Federal Home Loan Bank stock
Accrued interest receivable
Financial liabilities:
Deposits	242,020	189,871
Short-term borrowings
Other borrowings	29,069	9,512
Accrued interest payable

Note 19 - Accumulate Other Comp

Note 19 - Accumulate Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance	[1]	$ 1,201	$ 2,395	$ 2,548
Other comprehensive income before reclassification	[1]	475	(994)	60
Amount reclassified from accumulated other comprehensive income	[1]	(585)	(200)	(213)
Total other comprehensive loss	[1]	(110)	(1,194)	(153)
Amount reclassified from accumulated other comprehensive income	[1]	(585)	(200)	(213)
Balance	[1]	$ 1,091	$ 1,201	$ 2,395
[1]	All amounts are net of tax. Amounts in parentheses indicate debits to accumulated other comprehensive income.

Note 19 - Accumulated Other 105

Note 19 - Accumulated Other Comprehensive Income - Significant Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Unrealized gains on available-for-sale securities	$ 886	[1]	$ 303	[1]	$ 323
Income taxes	(301)	[1]	(103)	[1]	(110)
Net of tax	$ 585		$ 200		$ 213
[1]	Amounts in parentheses indicate expenses and other amounts indicate income.

Note 20 - Business Acquisiti106

Note 20 - Business Acquisition (Details Textual) - USD ($)	Jan. 12, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Goodwill		$ 15,071,000	$ 4,559,000
Goodwill, Impairment Loss		0	0	$ 0
Finite-Lived Core Deposits, Gross		2,700,000	36,000
Business Combination, Acquisition Related Costs		1,060,000
Core Deposits [Member]
Finite-Lived Intangible Assets, Accumulated Amortization		692,000	$ 318,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Business Combination, Consideration Transferred	$ 42,168,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	544,610
Payments to Acquire Businesses, Gross	$ 21,173,000
Shares Issued, Price Per Share	$ 38.55
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain		488,000
Goodwill	$ 10,512,000	10,500,000
Goodwill, Impairment Loss		0
Goodwill, Purchase Accounting Adjustments		575,000
Business Combination, Acquisition Related Costs		1,100,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] | Core Deposits [Member]
Finite-Lived Core Deposits, Gross		2,700,000
Finite-Lived Intangible Assets, Accumulated Amortization		$ 342,000

Note 20 - Business Acquisiti107

Note 20 - Business Acquisition - Purchase Price and Adjustments (Details) - USD ($)	Jan. 12, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill		$ 15,071,000	$ 4,559,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	544,610
Shares Issued, Price Per Share	$ 38.55
Purchase price assigned to Liberty common shares exchanged for Middlefield Banc Corp. shares	$ 20,995,000
Purchase price assigned to Liberty common shares exchanged for cash	21,173,000
Business Combination, Consideration Transferred	42,168,000
Previously held equity interest in Liberty	1,068,000	1,068,000
Liberty shareholders equity	30,474,000
Allowance for loan loss	3,257,000
Loans - interest rate	578,000
Loans - general credit	(2,161,000)
Core deposit intangible	3,087,000
Other	254,000
Time deposits	(141,000)
Deferred taxes	(906,000)
Change in control	(1,718,000)
Total net assets acquired	32,724,000
Goodwill	$ 10,512,000	$ 10,500,000

Note 20 - Business Acquisiti108

Note 20 - Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)	Jan. 12, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net assets acquired:
Goodwill		$ 15,071,000	$ 4,559,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Total purchase price	$ 42,168,000
Previously held equity interest in Liberty	1,068,000	1,068,000
Net assets acquired:
Cash	26,604,000
Loans and loans held for sale	201,341,000
Premises and equipment, net	325,000
Accrued interest receivable	440,000
Bank-owned life insurance	1,681,000
Core deposit intangible	3,087,000
Other assets	997,000
Time deposits	(30,744,000)
Non-time deposits	(167,300,000)
Accrued interest payable	(47,000)
Deferred taxes	(906,000)
Other liabilities	(2,754,000)
Total net assets acquired	32,724,000
Goodwill	$ 10,512,000	$ 10,500,000

Note 20 - Business Acquisiti109

Note 20 - Business Acquisition - Schedule of Future Amortization Expenses for Core Deposits Intangibles (Details) - Core Deposits [Member] $ in Thousands	Dec. 31, 2017USD ($)
2,019	$ 341
2,020	332
2,021	321
2,022	309
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Remaining 2,017	352
2,019	341
2,020	332
2,021	321
2,022	309
2,022	1,094
2,023	$ 2,749

Note 20 - Business Acquisiti110

Note 20 - Business Acquisition - Pro Forma Information (Details) - Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Net interest income	$ 10,354
Noninterest income	744
Net income	$ 2,625
Net interest income		$ 37,646	$ 34,817
Noninterest income		4,920	5,485
Net income		$ 8,438	$ 8,692
Basic pro forma (in dollars per share)		$ 2.79	$ 4.12
Diluted pro forma (in dollars per share)		$ 2.77	$ 4.10

Note 21 - Parent Company - Cond

Note 21 - Parent Company - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and due from banks	$ 39,886	$ 31,395
Investment securities available for sale	95,283	114,376
Other assets	9,144	7,502
TOTAL ASSETS	1,106,336	787,821
TOTAL LIABILITIES	986,473	710,861
STOCKHOLDERS' EQUITY	119,863	76,960	$ 62,304	$ 63,867
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,106,336	787,821
Parent Company [Member]
Cash and due from banks	1,766	2,543
Investment securities available for sale	625	1,139
Other assets	3,450	2,837
TOTAL ASSETS	128,150	85,244
Trust preferred securities	8,248	8,248
Other liabilities	39	36
TOTAL LIABILITIES	8,287	8,284
STOCKHOLDERS' EQUITY	119,863	76,960
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	128,150	85,244
Parent Company [Member] | Non Bank Subsidiary [Member]
Equity method investments	2,363	2,360
Parent Company [Member] | Subsidiary Banks [Member]
Equity method investments	$ 119,946	$ 76,365

Note 21 - Parent Company - C112

Note 21 - Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain on sale of investment securities									$ 886	$ 303	$ 323
Total income	$ 11,564	$ 11,330	$ 10,902	$ 10,199	$ 7,821	$ 7,420	$ 7,405	$ 7,348	43,995	29,994	28,595
Interest expense	1,762	1,818	1,625	1,442	1,073	1,026	1,066	1,025	6,647	4,190	3,820
Income before income tax benefit	4,073	3,376	3,392	2,836	2,436	1,604	2,492	1,789	13,677	8,321	8,427
Income tax benefit	1,687	914	885	736	776	261	566	302	4,222	1,905	1,562
NET INCOME	$ 2,386	$ 2,462	$ 2,507	$ 2,100	$ 1,660	$ 1,343	$ 1,926	$ 1,487	9,455	6,416	6,865
Comprehensive Income									9,345	5,222	6,712
Parent Company [Member]
Dividends from subsidiary bank									10,425	3,400	4,023
Gain on sale of investment securities									488
Other									80	24	19
Total income									10,993	3,424	4,042
Interest expense									460	366	290
Other									2,091	1,856	860
Total expenses									2,551	2,222	1,150
Income before income tax benefit									8,442	1,202	2,892
Income tax benefit									(673)	(561)	(386)
Income before equity in undistributed net income of subsidiaries									9,115	1,763	3,278
Equity in undistributed net income of subsidiaries									340	4,653	3,587
NET INCOME									9,455	6,416	6,865
Comprehensive Income									$ 9,345	$ 5,222	$ 6,712

Note 21 - Parent Company - C113

Note 21 - Parent Company - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 2,386	$ 2,462	$ 2,507	$ 2,100	$ 1,660	$ 1,343	$ 1,926	$ 1,487	$ 9,455	$ 6,416	$ 6,865
Gain on sale of investment securities									(886)	(303)	(323)
Other, net									(3,122)	330	(388)
Net cash provided by operating activities									13,920	7,801	7,182
Net (decrease) increase in short-term borrowings									6,348	32,534	21,017
Purchase of treasury stock											(6,784)
Proceeds from issuance of common stock									15,164	11,210
Cash dividends									3,358	2,318	2,153
Net cash used for financing activities									88,722	46,924	50,374
Increase (decrease) in cash									7,391	8,745	(1,889)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR				32,495				23,750	32,495	23,750	25,639
CASH AND CASH EQUIVALENTS AT END OF YEAR	39,886				32,495				39,886	32,495	23,750
Common stock issued in business acquisition									20,995
Parent Company [Member]
Net income									9,455	6,416	6,865
Equity method investments, income (loss)									(340)	(4,653)	(3,587)
Stock-based compensation expense									33	29	18
Gain on sale of investment securities									(488)
Other, net									282	(484)	(503)
Net cash provided by operating activities									8,942	1,308	2,793
Acquisition, net of cash paid									(22,249)
Net (decrease) increase in short-term borrowings										(9,499)	6,363
Purchase of treasury stock											(6,784)
Proceeds from issuance of common stock									15,164	11,210
Stock options exercised									184	(6)	(7)
Proceeds from dividend reinvestment plan									540	519	651
Cash dividends									(3,358)	(2,318)	(2,153)
Net cash used for financing activities									12,530	(94)	(1,930)
Increase (decrease) in cash									(777)	1,214	863
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR				$ 2,543				$ 1,329	2,543	1,329	466
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 1,766				$ 2,543				1,766	2,543	1,329
Common stock issued in business acquisition									20,995
Parent Company [Member] | Middlefield Banking Company [Member]
Equity method investments, income (loss)									(337)	(4,710)	(3,703)
Parent Company [Member] | EMORECO [Member]
Equity method investments, income (loss)									$ (3)	$ 57	$ 116

Note 22 - Selected Quarterly114

Note 22 - Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total income	$ 11,564	$ 11,330	$ 10,902	$ 10,199	$ 7,821	$ 7,420	$ 7,405	$ 7,348	$ 43,995	$ 29,994	$ 28,595
Interest expense	1,762	1,818	1,625	1,442	1,073	1,026	1,066	1,025	6,647	4,190	3,820
Net interest income	9,802	9,512	9,277	8,757	6,748	6,394	6,339	6,323	37,348	25,804	24,775
Provision for loan losses	430	280	170	165	255	105	105	105
Net interest income after provision for loan losses	9,372	9,232	9,107	8,592	6,493	6,289	6,234	6,218	36,303	25,234	24,460
Total noninterest income	918	1,441	989	1,511	900	977	1,173	909	4,859	3,959	4,044
Total noninterest expense	6,217	7,297	6,704	7,267	4,957	5,662	4,915	5,338	27,485	20,872	20,077
Income before income tax benefit	4,073	3,376	3,392	2,836	2,436	1,604	2,492	1,789	13,677	8,321	8,427
Income tax benefit	1,687	914	885	736	776	261	566	302	4,222	1,905	1,562
Net income	$ 2,386	$ 2,462	$ 2,507	$ 2,100	$ 1,660	$ 1,343	$ 1,926	$ 1,487	$ 9,455	$ 6,416	$ 6,865
Net income, basic (in dollars per share)	$ 0.73	$ 0.77	$ 0.84	$ 0.78	$ 0.71	$ 0.60	$ 0.94	$ 0.79	$ 3.12	$ 3.04	$ 3.41
Net income, diluted (in dollars per share)	$ 0.73	$ 0.76	$ 0.83	$ 0.78	$ 0.70	$ 0.60	$ 0.94	$ 0.79	$ 3.10	$ 3.03	$ 3.39
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares)	3,215,300	3,212,335	3,000,451	2,679,816	2,251,412	2,247,587	2,051,137	1,878,177	3,028,950	2,107,857	2,014,966
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares)	3,231,791	3,223,753	3,014,140	2,692,015	2,264,712	2,256,230	2,059,411	1,886,943	3,052,585	2,119,214	2,024,120

Note 23 - Return on Equity a115

Note 23 - Return on Equity and Assets - Summary of Return on Equity and Assets (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Average total assets										$ 1,069,656	$ 757,052	$ 710,271
Average shareholders' equity										110,966	68,741	64,655
Net income		$ 2,386	$ 2,462	$ 2,507	$ 2,100	$ 1,660	$ 1,343	$ 1,926	$ 1,487	9,455	6,416	6,865
Net income available to common shareholders										$ 9,455	$ 6,416	$ 6,865
Cash dividends declared per share (in dollars per share)										$ 1.08	$ 1.08	$ 1.07
Return on average total assets										0.88%	0.85%	0.97%
Return on average shareholders' equity										8.52%	9.33%	10.62%
Dividend payout ratio (1)	[1]									35.52%	36.18%	31.36%
Average shareholders' equity to average assets										10.37%	9.08%	9.10%
[1]	Cash dividends declared on common shares divided by net income available to common shareholders.