First Mid Bancshares (FMBH) 10-K 2 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 02, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	FIRST MID ILLINOIS BANCSHARES INC
Entity Central Index Key	700,565
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
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
Entity Common Stock, Shares Outstanding		12,673,998
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 343,528,706

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Cash and due from banks:
Non-interest bearing	$ 75,398,000	$ 57,988,000
Interest bearing	12,990,000	79,014,000
Federal funds sold	491,000	38,900,000
Cash and cash equivalents	88,879,000	175,902,000
Certificates of deposit investments	1,685,000	14,643,000
Investment securities:
Available-for-sale, at fair value	578,579,000	619,848,000
Held-to-maturity, at amortized cost (estimated fair value of $68,457 and $73,096 at December 31, 2017 and 2016, respectively)	69,332,000	74,231,000
Loans held for sale	1,025,000	1,175,000
Loans	1,938,476,000	1,824,817,000
Less allowance for loan losses	(19,977,000)	(16,753,000)
Net loans	1,918,499,000	1,808,064,000
Interest receivable	10,832,000	10,553,000
Other real estate owned	2,754,000	1,982,000
Premises and equipment, net	38,266,000	40,292,000
Goodwill, net	60,150,000	57,791,000
Intangible assets, net	10,679,000	12,832,000
Bank Owned Life Insurance	41,883,000	41,318,000
Other assets	18,976,000	25,904,000
Total assets	2,841,539,000	2,884,535,000
Deposits:
Non-interest bearing	480,283,000	471,206,000
Interest bearing	1,794,356,000	1,858,681,000
Total deposits	2,274,639,000	2,329,887,000
Repurchase agreements with customers	155,388,000	185,763,000
Interest payable	602,000	535,000
Federal Home Loan Bank Advances Short and Long Term	60,038,000	40,094,000
Other borrowings	10,313,000	18,063,000
Junior subordinated debentures	24,000,000	23,917,000
Other liabilities	8,595,000	5,603,000
Total liabilities	2,533,575,000	2,603,862,000
Stockholders' Equity
Common stock, $4 par value; authorized 18,000,000 shares; issued 13,231,225 shares in 2017 and 13,020,742 shares in 2016	54,925,000	54,083,000
Additional paid-in capital	163,603,000	158,671,000
Retained earnings	104,683,000	86,216,000
Deferred compensation	3,540,000	3,201,000
Accumulated other comprehensive loss	(2,304,000)	(5,761,000)
Less treasury stock at cost, 570,477 shares in 2017 and 549,743 shares in 2016	(16,483,000)	(15,737,000)
Total stockholders’ equity	307,964,000	280,673,000
Total liabilities and stockholders’ equity	$ 2,841,539,000	$ 2,884,535,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment securities:
Held-to-maturity Securities, Fair Value	$ 68,457	$ 73,096
Stockholders Equity
Common stock, par value (in dollars per share)	$ 4	$ 4
Common stock, authorized (in shares)	18,000,000	18,000,000
Common stock, issued (in shares)	13,231,225	13,020,742
Treasury stock (in shares)	570,477	549,743

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Interest and fees on loans	$ 82,670	$ 61,952	$ 48,460
Taxable	11,708	9,288	7,741
Exempt from federal income tax	4,774	3,726	2,807
Interest on certificates of deposit investments	50	295	44
Interest on federal funds sold	62	40	0
Interest on deposits with other financial institutions	291	195	199
Total interest income	99,555	75,496	59,251
Interest expense:
Interest on deposits	3,995	2,713	2,282
Interest on securities sold under agreements to repurchase	181	96	62
Interest on FHLB borrowings	883	630	616
Interest on other borrowings	496	181	13
Interest on subordinated debentures	927	672	526
Total interest expense	6,482	4,292	3,499
Net interest income	93,073	71,204	55,752
Provision for loan losses	7,462	2,826	1,318
Net interest income after provision for loan losses	85,611	68,378	54,434
Other income:
Trust revenues	3,744	3,517	3,746
Brokerage commissions	2,161	1,908	1,315
Insurance commissions	3,872	3,452	2,107
Service charges	6,920	6,791	5,681
Securities gains, net	616	1,192	452
Mortgage banking revenue, net	1,184	1,172	754
ATM / debit card revenue	6,495	6,004	4,676
Bank Owned Life Insurance Income	1,638	671	0
Other income	(3,706)	(2,205)	(1,813)
Total other income	30,336	26,912	20,544
Other expense:
Salaries and employee benefits	39,756	32,354	26,337
Net occupancy and equipment expense	12,596	11,418	9,143
Net other real estate owned expense	560	60	19
Amortization of intangible assets	905	966	904
Amortization of intangible assets	2,153	1,909	891
Stationery and supplies	724	815	681
Legal and professional	3,887	3,035	2,474
Marketing and donations	1,356	1,845	1,092
Other expense	12,284	9,108	7,707
Total other expense	74,221	61,510	49,248
Income before income taxes	41,726	33,780	25,730
Income taxes	15,042	11,940	9,218
Net income	26,684	21,840	16,512
Dividends on preferred shares	0	825	2,200
Net income available to common stockholders	$ 26,684	$ 21,015	$ 14,312
Per share data:
Basic net income per common share available to common stockholders	$ 2.13	$ 2.07	$ 1.84
Diluted earnings per common share	2.13	2.05	1.81
Cash dividends declared per common share	$ 0.66	$ 0.62	$ 0.59

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 26,684	$ 21,840	$ 16,512
Other Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, net of taxes of $(2,855), $3,848 and $(1,005) for the years ended December 31, 2017, 2016 and 2015, respectively	3,845	(6,025)	1,572
Unamortized holding gains on held to maturity securities transferred from available for sale, net of taxes of $(32), $(172) and $(193) for December 31, 2017, 2016 and 2015, respectively	80	268	302
Less: reclassification adjustment for realized gains included in net income net of taxes of $216, $465 and $176 for the years ended December 31, 2017, 2016 and 2015, respectively	(400)	(727)	(276)
Other comprehensive income (loss), net of taxes	3,525	(6,484)	1,598
Comprehensive income	$ 30,209	$ 15,356	$ 18,110

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income [Abstract]
Unrealized gains on available-for-sale securities, taxes	$ (2,855)	$ 3,848	$ (1,005)
Other Comprehensive Income Loss Transfers From Available For Sale To Held To Maturity, Tax	(32)	(172)	(193)
Other Comprehensive Income Loss Reclassification Adjustment For Sale Or Writedown Of Securities Included In Net Income Tax	$ 216	$ 465	$ 176

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Deferred Compensation	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2014	$ 164,916	$ 27,400	$ 32,119	$ 55,607	$ 61,956	$ 3,329	$ (875)	$ (14,620)
Net income	16,512				16,512
Other Comprehensive Income (Loss), Net of Tax	1,598						1,598
Dividends on preferred shares	(2,200)				(2,200)
Dividends on common stock	(4,556)				(4,556)
Issuance of common shares pursuant to the Dividend Reinvestment Plan	1,266		239	1,027
Issuance of common shares pursuant to the Deferred Compensation Plan	130		25	105
Issuance of common shares pursuant to the First Retirement & Savings Plan	241		48	193
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan	(272)		13	55		(340)
Stock Issued During Period, Value, New Issues	27,854	0	5,571	22,283	0	0	0	0
Purchase of treasury shares	(1,066)							(1,066)
Deferred Compensation	0					26		26
Tax benefit related to Deferred Compensation Plan distributions	85			85
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	271			271
Vested restricted shares/units compensation expense	230	0	0	0	0	230	0	0
Balance at Dec. 31, 2015	205,009	27,400	38,015	79,626	71,712	3,245	723	(15,712)
Net income	21,840				21,840
Other Comprehensive Income (Loss), Net of Tax	(6,484)						(6,484)
Dividends on preferred shares	(825)				(825)
Dividends on common stock	(6,511)				(6,511)
Issuance of common shares pursuant to the Dividend Reinvestment Plan	1,323		202	1,121
Issuance of common shares pursuant to the Deferred Compensation Plan	119		19	100
Issuance of common shares pursuant to the First Retirement & Savings Plan	14		2	12
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan	80		12	68
Issuance of common shares pursuant to the exercise of stock options	62		10	52
Stock issued during period, Conversion of Preferred Shares	0	(27,400)	(5,421)	(21,979)
Stock Issued During Period, Value, Acquisitions	65,697	0	10,402	55,295	0	0	0	0
Deferred Compensation	0					25		25
Tax benefit related to Deferred Compensation Plan distributions	140			140
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	278			278
Vested restricted shares/units compensation expense	(69)	0	0	0	0	(69)	0	0
Balance at Dec. 31, 2016	280,673		54,083	158,671	86,216	3,201	(5,761)	(15,737)
Net income	26,684				26,684
Other Comprehensive Income (Loss), Net of Tax	3,525						3,525
Dividends on preferred shares	0
Reclassification from AOCI, Current Period, Tax	0	0	0	0	68	0	(68)	0
Dividends on common stock	(8,285)				(8,285)
Issuance of common shares pursuant to the Dividend Reinvestment Plan	1,057		120	937
Issuance of common shares pursuant to the Deferred Compensation Plan	232		28	204
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan	1,804		189	1,615
Stock Issued During Period, Value, New Issues	3,251	0	395	2,856	0	0	0	0
Issuance of common shares pursuant to the exercise of stock options	699		110	589
Purchase of treasury shares	(797)							(797)
Deferred Compensation	0					51		51
Tax benefit related to Deferred Compensation Plan distributions	216			216
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	5			5
Grant of restricted stock units pursuant to the 2007 Stock Incentive Plan	359			359
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(1,849)			(1,849)
Vested restricted shares/units compensation expense	390	0	0	0	0	390	0	0
Balance at Dec. 31, 2017	$ 307,964	$ 0	$ 54,925	$ 163,603	$ 104,683	$ 3,540	$ (2,304)	$ (16,483)

Consolidated Statements of Cha8

Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends on perferred stock (in dollars per share)	$ 0	$ 150	$ 400
Dividends on common stock (in dollars per share)	$ 0.66	$ 0.62	$ 0.59
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares)	30,059	50,446	59,717
Issuance of common shares pursuant to the Deferred Compensation Plan (in shares)	6,875	4,683	6,153
Issuance of common shares pursuant to the First Retirement & Savings Plan (in shares)	0	558	11,885
Issuance of restricted common shares pursuant to the Stock Incentive Plan (in shares)	47,339	2,910	3,281
Stock Issued During Period, Shares, Acquisitions	98,710	2,600,616
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	1,355,319
number of preferred shares converted to common shares	0	5,500
Purchase of treasury shares (in shares)	20,734	0	53,246
Issuance of common shares pursuant to the exercise of stock options (in shares)	27,500	2,500	0
Common Stock
Stock issued during period, new issue (in shares)			1,392,859

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 26,684	$ 21,840	$ 16,512
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	7,462	2,826	1,318
Depreciation, amortization and accretion, net	8,134	7,936	4,442
Change in cash surrender value of bank owned life insurance	(1,126)	(671)	0
Insured Event, Gain (Loss)	511	0	0
Stock-based compensation expense	954	384	378
Gains on investment securities, net	(616)	(1,192)	(452)
Loss (gain) on sales of other real property owned, net	667	(1)	(21)
Donation of building	0	653	0
Loss on write down of premises and equipment	11	28	221
Gain (Loss) on Sales of Loans, Net	(698)	0	0
Gains on sale of loans held for sale, net	(1,102)	(1,224)	(763)
Deferred income taxes	2,498	(2,388)	20
Increase in accrued interest receivable	(279)	(629)	(763)
Increase (decrease) in accrued interest payable	94	(84)	(54)
Origination of loans held for sale	(67,321)	(79,682)	(56,091)
Proceeds from sale of loans held for sale	68,573	80,699	57,844
Decrease in other assets	668	1,802	169
Increase (decrease) in other liabilities	666	(2,875)	(762)
Net cash provided by operating activities	46,154	27,422	21,998
Cash flows from investing activities:
Proceeds from maturities of certificates of deposit investments	12,958	25,245	1,245
Purchases of certificates of deposit investments	0	(12,958)	(26,245)
Proceeds from sales of securities available-for-sale	159,663	70,757	19,380
Proceeds from maturities of securities held-to-maturity	73,310	117,003	103,481
Proceeds from maturities of securities available-for-sale	0	83,000	10,000
Purchases of securities available-for-sale	(183,319)	(194,946)	(257,693)
Purchases of securities held-to-maturity	0	(71,557)	(46,000)
Net increase in loans	(123,931)	(106,608)	(68,958)
Proceeds from sale of premises and equipment	0	147	0
Purchases of premises and equipment	(1,274)	(695)	(1,762)
Proceeds from sales of other real property owned	5,559	793	260
Investment in bank owned life insurance	0	(25,000)	0
Capitalization of mortgage servicing rights	0	(14)	0
Proceeds from Life Insurance Policies	1,072	0	0
Cash received related to acquisition, net of cash and cash equivalents acquired	0	36,774	276,661
Net cash provided by (used in) investing activities	(55,962)	(78,059)	10,369
Cash flows from financing activities:
Net (decrease) increase in deposits	(55,248)	60,632	6,844
(Decrease) Increase in repurchase agreements	(30,375)	33,658	3,176
Proceeds from FHLB advances	52,000	20,000	5,000
Repayment of FHLB advances	(32,000)	(15,000)	(5,000)
Proceeds from short-term debt	0	7,000	2,000
Repayment of short-term debt	(4,000)	(3,938)	(2,000)
Proceeds from long-term debt	0	15,000	0
Repayments of Long-term Debt	3,750	0	0
Proceeds from issuance of common stock	4,399	195	28,222
Direct expenses related to capital transactions	(216)	(229)	0
Purchase of treasury stock	(797)	0	(1,066)
Dividends paid on preferred stock	0	(1,286)	(2,002)
Dividends paid on common stock	(7,228)	(5,277)	(3,487)
Net cash provided by (used in) financing activities	(77,215)	110,755	31,687
Increase (decrease) in cash and cash equivalents	(87,023)	60,118	64,054
Cash and cash equivalents at beginning of period	175,902	115,784	51,730
Cash and cash equivalents at end of period	88,879	175,902	115,784
Cash paid during the period for:
Interest	6,415	4,113	3,428
Income taxes	11,721	13,135	7,796
Supplemental disclosures of noncash investing and financing activities
Loans transferred to other real estate owned	6,034	328	458
Dividends reinvested in common stock	1,057	1,323	1,266
Net tax benefit related to option and deferred compensation plans	221	140	85
Conversion of preferred stock	0	27,500	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed [Abstract]
Fair value of assets acquired		668,905
Cash paid		22,545
Common stock issued		65,926
Total consideration paid		88,471
Fair value of liabilities assumed		$ 580,434

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Accounting and Consolidation The accompanying consolidated financial statements include the accounts of First Mid-Illinois Bancshares, Inc. (“Company”) and its wholly-owned subsidiaries: Mid-Illinois Data Services, Inc. (“MIDS”), First Mid-Illinois Bank & Trust, N.A. (“First Mid Bank”), and The Checkley Agency, Inc. doing business as First Mid Insurance Group (“First Mid Insurance”). All significant intercompany balances and transactions have been eliminated in consolidation. Certain amounts in the prior year’s consolidated financial statements have been reclassified to conform to the 2017 presentation and there was no impact on net income or stockholders’ equity from these reclassifications. The Company operates as a single segment entity for financial reporting purposes. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America. Following is a description of the more significant of these policies. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The Company uses estimates and employs the judgments of management in determining the amount of its allowance for loan losses and income tax accruals and deferrals, in its fair value measurements of investment securities, and in the evaluation of impairment of loans, goodwill, investment securities, and fixed assets. As with any estimate, actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses. In connection with the determination of the allowance for loan losses, management obtains independent appraisals for significant properties. Fair Value Measurements The fair value of a financial instrument is defined as the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale. The Company estimates the fair value of a financial instrument using a variety of valuation methods. Where financial instruments are actively traded and have quoted market prices, quoted market prices are used for fair value. When the financial instruments are not actively traded, other observable market inputs, such as quoted prices of securities with similar characteristics, may be used, if available, to determine fair value. When observable market prices do not exist, the Company estimates fair value. The Company’s valuation methods consider factors such as liquidity and concentration concerns. Other factors such as model assumptions, market dislocations, and unexpected correlations can affect estimates of fair value. Imprecision in estimating these factors can impact the amount of revenue or loss recorded. At the end of each quarter, the Company assesses the valuation hierarchy for each asset or liability measured. From time to time, assets or liabilities may be transferred within hierarchy levels due to changes in availability of observable market inputs to measure fair value at the measurement date. Transfers into or out of hierarchy levels are based upon the fair value at the beginning of the reporting period. A more detailed description of the fair values measured at each level of the fair value hierarchy can be found in Note 11 – “Disclosures of Fair Values of Financial Instruments.” Cash and Cash Equivalents For purposes of reporting cash flows, cash equivalents include non-interest bearing and interest bearing cash and due from banks and federal funds sold. Generally, federal funds are sold for one-day periods. Certificates of Deposit Investments Certificates of deposit investments have original maturities of three to five years and are carried at cost. Investment Securities The Company classifies its investments in debt and equity securities as either held-to-maturity or available-for-sale in accordance with Statement of Financial Accounting Standards (SFAS) No. 115, “Accounting for Certain Investments in Debt and Equity Securities,” which was codified into ASC 320. Securities classified as held-to-maturity are recorded at cost or amortized cost. Available-for-sale securities are carried at fair value. Fair value calculations are based on quoted market prices when such prices are available. If quoted market prices are not available, estimates of fair value are computed using a variety of techniques, including extrapolation from the quoted prices of similar instruments or recent trades for thinly traded securities, fundamental analysis, or through obtaining purchase quotes. Due to the subjective nature of the valuation process, it is possible that the actual fair values of these investments could differ from the estimated amounts, thereby affecting the financial position, results of operations and cash flows of the Company. If the estimated value of investments is less than the cost or amortized cost, the Company evaluates whether an event or change in circumstances has occurred that may have a significant adverse effect on the fair value of the investment. If such an event or change has occurred and the Company determines that the impairment is other-than-temporary, a further determination is made as to the portion of impairment that is related to credit loss. The impairment of the investment that is related to the credit loss is expensed in the period in which the event or change occurred. The remainder of the impairment is recorded in other comprehensive income. Loans Loans are stated at the principal amount outstanding net of unearned discounts, unearned income and the allowance for loan losses. Unearned income includes deferred loan origination fees reduced by loan origination costs and is amortized to interest income over the life of the related loan using methods that approximate the effective interest rate method. Interest on substantially all loans is credited to income based on the principal amount outstanding. The Company’s policy is to discontinue the accrual of interest income on any loan that becomes ninety days past due as to principal or interest or earlier when, in the opinion of management there is reasonable doubt as to the timely collection of principal or interest. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collectability of interest or principal. Loans expected to be sold are classified as held for sale in the consolidated financial statements and are recorded at the lower of aggregate cost or market value, taking into consideration future commitments to sell the loans. Allowance for Loan Losses The Company believes the allowance for loan losses is the critical accounting policy that requires the most significant judgments and assumptions used in the preparation of its consolidated financial statements. An estimate of potential losses inherent in the loan portfolio is determined and an allowance for those losses is established by considering factors including historical loss rates, expected cash flows and estimated collateral values. In assessing these factors, the Company uses organizational history and experience with credit decisions and related outcomes. The allowance for loan losses represents the best estimate of losses inherent in the existing loan portfolio. The allowance for loan losses is increased by the provision for loan losses charged to expense and reduced by loans charged off, net of recoveries. The Company evaluates the allowance for loan losses quarterly. If the underlying assumptions later prove to be inaccurate based on subsequent loss evaluations, the allowance for loan losses is adjusted. The Company estimates the appropriate level of allowance for loan losses by separately evaluating impaired and nonimpaired loans. A specific allowance is assigned to an impaired loan when expected cash flows or collateral do not justify the carrying amount of the loan. The methodology used to assign an allowance to a nonimpaired loan is more subjective. Generally, the allowance assigned to nonimpaired loans is determined by applying historical loss rates to existing loans with similar risk characteristics, adjusted for qualitative factors including the volume and severity of identified classified loans, changes in economic conditions, changes in credit policies or underwriting standards, and changes in the level of credit risk associated with specific industries and markets. Because the economic and business climate in any given industry or market, and its impact on any given borrower, can change rapidly, the risk profile of the loan portfolio is continually assessed and adjusted when appropriate. Notwithstanding these procedures, there still exists the possibility that the assessment could prove to be significantly incorrect and that an immediate adjustment to the allowance for loan losses would be required. The Company has loans acquired from business combinations with uncollected principal balances. These loans are carried net of a fair value adjustment for credit risk and interest rates and are only included in the allowance calculation to the extent that the reserve requirement exceeds the fair value adjustment. However, as the acquired loans renew, it is necessary to establish an allowance which represents an amount that, in management's opinion, will be adequate to absorb probable credit losses inherent in such loans. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization is charged to expense and determined principally by the straight-line method over the estimated useful lives of the assets. The estimated useful lives for each major depreciable classification of premises and equipment are as follows: Buildings and improvements 20 years to 40 years Leasehold improvements 5 years to 15 years Furniture and equipment 3 years to 7 years Goodwill and Intangible Assets The Company has goodwill from business combinations, identifiable intangible assets assigned to core deposit relationships and customer lists acquired, and intangible assets arising from the rights to service mortgage loans for others. Identifiable intangible assets generally arise from branches acquired that the Company accounted for as purchases. Such assets consist of the excess of the purchase price over the fair value of net assets acquired, with specific amounts assigned to core deposit relationships and customer lists primarily related to insurance agency. Intangible assets are amortized by the straight-line method over various periods up to fifteen years. Management reviews intangible assets for possible impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. In accordance with the provisions of SFAS No. 142, “ Goodwill and Other Intangible Assets ,” codified into ASC 350, the Company performed testing of goodwill for impairment as of September 30, 2017 and determined that, as of that date, goodwill was not impaired. Management also concluded that the remaining amounts and amortization periods were appropriate for all intangible assets. Other Real Estate Owned Other real estate owned acquired through loan foreclosure is initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. The adjustment at the time of foreclosure is recorded through the allowance for loan losses. Due to the subjective nature of establishing the fair value when the asset is acquired, the actual fair value of the other real estate owned or foreclosed asset could differ from the original estimate. If it is determined that fair value temporarily declines subsequent to foreclosure, a valuation allowance is recorded through noninterest expense. Operating costs associated with the assets after acquisition are also recorded as noninterest expense. Gains and losses on the disposition of other real estate owned and foreclosed assets are netted and posted to other noninterest expense. Bank Owned Life Insurance First Mid Bank has purchased life insurance policies on certain senior management. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts that are probable at settlement. Federal Home Loan Bank Stock Federal Home Loan Bank stock is a required investment for institutions that are members of the Federal Home Loan Bank system. The required investment in the common stock is based on a predetermined formula. Income Taxes The Company and its subsidiaries file consolidated federal and state income tax returns with each organization computing its taxes on a separate company basis. Amounts provided for income tax expense are based on income reported for financial statement purposes rather than amounts currently payable under tax laws. Deferred tax assets and liabilities are recognized for future tax consequences attributable to the temporary differences existing between the financial statement carrying amounts of assets and liabilities and their respective tax basis, as well as operating loss and tax credit carry forwards. To the extent that current available evidence about the future raises doubt about the realization of a deferred tax asset, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as an increase or decrease in income tax expense in the period in which such change is enacted. On December 22, 2017, the United States enacted certain tax reforms through the Tax Cuts and Jobs Act , which changes existing tax laws, most significantly a change in the statutory corporate tax rate from 35% to 21%. As a result of this enactment, the Company incurred additional one-time income tax expense of approximately $1.4 million during the fourth quarter of 2017, primarily due to remeasurement of deferred tax assets and liabilities. Additionally, the Company reviews its uncertain tax positions annually under FASB Interpretation No. 48 (FIN No. 48), “ Accounting for Uncertainty in Income Taxes ,” codified within ASC 740. An uncertain tax position is recognized as a benefit only if it is "more likely than not" that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount actually recognized is the largest amount of tax benefit that is greater than 50% likely to be recognized on examination. For tax positions not meeting the "more likely than not" test, no tax benefit is recorded. A significant amount of judgment is applied to determine both whether the tax position meets the "more likely than not" test as well as to determine the largest amount of tax benefit that is greater than 50% likely to be recognized. Differences between the position taken by management and that of taxing authorities could result in a reduction of a tax benefit or increase to tax liability, which could adversely affect future income tax expense. Trust Department Assets Assets held in fiduciary or agency capacities are not included in the consolidated balance sheets since such items are not assets of the Company or its subsidiaries. Fees from trust activities are recorded on a cash basis over the period in which the service is provided. Fees are a function of the market value of assets managed and administered, the volume of transactions, and fees for other services rendered, as set forth in the underlying client agreement with the Trust & Wealth Management Division of First Mid Bank. This revenue recognition involves the use of estimates and assumptions, including components that are calculated based on asset valuations and transaction volumes. Any out of pocket expenses or services not typically covered by the fee schedule for trust activities are charged directly to the trust account on a gross basis as trust revenue is incurred. At December 31, 2017 , the Company managed or administered 1,119 accounts with assets totaling approximately $997.8 million . At December 31, 2016 , the Company managed or administered 1,231 accounts with assets totaling approximately $831.6 million . Treasury Stock Treasury stock is stated at cost. Cost is determined by the first-in, first-out method. Stock Incentive Awards At the Annual Meeting of Stockholders held April 26, 2017, the stockholders approved the 2017 Stock Incentive Plan ("SI Plan"). The SI Plan was implemented to succeed the Company's 2007 Stock Incentive Plan, which had a ten-year term. The SI Plan is intended to provide a means whereby directors, employees, consultants and advisors of the Company and its Subsidiaries may sustain a sense of proprietorship and personal involvement in the continued development and financial success of the Company and its Subsidiaries, thereby advancing the interests of the Company and its stockholders. Accordingly, directors and selected employees, consultants and advisors may be provided the opportunity to acquire shares of Common Stock of the Company on the terms and conditions established in the SI Plan. A maximum of 149,983 shares of common stock may be issued under the SI Plan. Prior to December 31, 2008, the Company had awarded 59,500 shares as stock options under the 2007 SI plan. There have been no stock options awarded since 2008. The Company awarded 18,391 , 13,912 , and 18,002 shares during 2017, 2016, and 2015, respectively as stock and stock unit awards. Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive income (loss) included in stockholders’ equity as of December 31, 2017 and 2016 are as follows (in thousands): Unrealized Gain (Loss) on Securities Securities with Other-Than-Temporary Impairment Losses Total December 31, 2017 Net unrealized losses on securities available-for-sale $ (2,619 ) $ — $ (2,619 ) Unamortized losses on securities held-to-maturity transferred from available-for-sale (281 ) — (281 ) Securities with other-than-temporary impairment losses — (345 ) (345 ) Tax benefit 841 100 941 Balance at December 31, 2017 $ (2,059 ) $ (245 ) $ (2,304 ) December 31, 2016 Net unrealized losses on securities available-for-sale $ (7,649 ) $ — $ (7,649 ) Unamortized losses on securities held-to-maturity transferred from available-for-sale (393 ) — (393 ) Securities with other-than-temporary impairment losses — (1,398 ) (1,398 ) Tax benefit 3,134 545 3,679 Balance at December 31, 2016 $ (4,908 ) $ (853 ) $ (5,761 ) Amounts reclassified from accumulated other comprehensive income and the affected line items in the statements of income during the years ended December 31, 2017, 2016 and 2015 , were as follows (in thousands): Amounts Reclassified from Other Comprehensive Income Affected Line Item in the Statements of Income 2017 2016 2015 Realized gains on available-for-sale securities $ 616 1,192 452 Securities gains, net (Total reclassified amount before tax) (216 ) (465 ) (176 ) Tax expense Total reclassifications out of accumulated other comprehensive income $ 400 $ 727 $ 276 Net reclassified amount See “Note 4 – Investment Securities” for more detailed information regarding unrealized losses on available-for-sale securities.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Basic net income per common share available to common stockholders is calculated as net income less preferred stock dividends divided by the weighted average number of common shares outstanding. Diluted net income per common share available to common stockholders is computed using the weighted average number of common shares outstanding, increased by the assumed conversion of the Company’s convertible preferred stock and the Company’s stock options and restricted stock awarded, unless anti-dilutive. The components of basic and diluted net income per common share available to common stockholders for the years ended December 31, 2017, 2016 and 2015 were as follows: 2017 2016 2015 Basic Net Income per Common Share Available to Common Stockholders: Net income $ 26,684,000 $ 21,840,000 $ 16,512,000 Preferred stock dividends — (825,000 ) (2,200,000 ) Net income available to common stockholders 26,684,000 21,015,000 14,312,000 Weighted average common shares outstanding 12,531,659 10,149,099 7,775,490 Basic earnings per common share $ 2.13 $ 2.07 $ 1.84 Diluted Net Income per Common Share Available to Common Stockholders: Net income available to common stockholders $ 26,684,000 $ 21,015,000 $ 14,312,000 Effect of assumed preferred stock conversion — 825,000 2,200,000 Net income applicable to diluted earnings per share 26,684,000 21,840,000 16,512,000 Weighted average common shares outstanding 12,531,659 10,149,099 7,775,490 Dilutive potential common shares: Assumed conversion of stock options 4,875 3,111 — Restricted stock awarded — 4,107 6,851 Assumed conversion of preferred stock — 507,393 1,355,348 Dilutive potential common shares 4,875 514,611 1,362,199 Diluted weighted average common shares outstanding 12,536,534 10,663,710 9,137,689 Diluted earnings per common share $ 2.13 $ 2.05 $ 1.81 The following shares were not considered in computing diluted earnings per share for the years ended December 31, 2017, 2016 and 2015 because they were anti-dilutive: 2017 2016 2015 Stock options to purchase shares of common stock — — 45,500

Cash and Due from Banks

Cash and Due from Banks	12 Months Ended
	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash and Due from Banks [Text Block]	Cash and Due from Banks Aggregate cash and due from bank balances of $8,944,000 , $16,643,000 and $8,175,000 were maintained in satisfaction of statutory reserve requirements of the Federal Reserve Bank at December 31, 2017, 2016 and 2015 , respectively. At December 31, 2017 , the Company’s cash accounts did not exceed the federally insured limits.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	The amortized cost, gross unrealized gains and losses and estimated fair values for available-for-sale and held-to-maturity securities by major security type at December 31, 2017 and December 31, 2016 were as follows (in thousands): December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 115,796 $ 8 $ (2,034 ) $ 113,770 Obligations of states and political subdivisions 165,037 2,254 (1,025 ) 166,266 Mortgage-backed securities: GSE residential 295,778 493 (2,460 ) 293,811 Trust preferred securities 2,893 — (345 ) 2,548 Other securities 2,039 145 — 2,184 Total available-for-sale $ 581,543 $ 2,900 $ (5,864 ) $ 578,579 Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 69,332 $ 103 $ (978 ) $ 68,457 December 31, 2016 Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 138,819 $ 13 $ (2,508 ) $ 136,324 Obligations of states and political subdivisions 164,163 1,346 (2,804 ) 162,705 Mortgage-backed securities: GSE residential 318,829 531 (4,369 ) 314,991 Trust preferred securities 3,050 — (1,398 ) 1,652 Other securities 4,034 147 (5 ) 4,176 Total available-for-sale $ 628,895 $ 2,037 $ (11,084 ) $ 619,848 Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 74,231 $ 203 $ (1,338 ) $ 73,096 Trust preferred securities at December 31, 2017 , is one trust preferred pooled security issued by First Tennessee Financial (“FTN”). The unrealized loss of this security, which has a maturity of twenty years, is primarily due to its long-term nature, a lack of demand or inactive market for the security, and concerns regarding the underlying financial institutions that have issued the trust preferred security. See the heading “Trust Preferred Securities” below for further information regarding this security. Proceeds from sales of investment securities, realized gains and losses and income tax expense and benefit were as follows during the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Proceeds from sales $ 159,663 $ 70,757 $ 19,380 Gross gains 773 1,192 452 Gross losses (157 ) — — Income tax expense 216 465 176 The following table indicates the expected maturities of investment securities classified as available-for-sale presented at fair value, and held-to-maturity presented at amortized cost at December 31, 2017 and the weighted average yield for each range of maturities (in thousands): One year or less After 1 through 5 years After 5 through 10 years After ten years Total Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 70,462 $ 38,359 $ 4,949 $ — $ 113,770 Obligations of state and political subdivisions 16,897 74,454 73,297 1,618 166,266 Mortgage-backed securities: GSE residential 75 168,002 125,734 — 293,811 Trust preferred securities — — — 2,548 2,548 Other securities — 2,012 — 172 2,184 Total investments $ 87,434 $ 282,827 $ 203,980 $ 4,338 $ 578,579 Weighted average yield 2.28 % 3.30 % 4.11 % 2.74 % 3.42 % Full tax-equivalent yield 2.67 % 3.82 % 4.88 % 3.55 % 4.01 % Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 39,993 $ 29,339 $ — $ — $ 69,332 Weighted average yield 1.76 % 2.08 % — % — % 1.90 % Full tax-equivalent yield 1.76 % 2.08 % — % — % 1.90 % The weighted average yields are calculated on the basis of the amortized cost and effective yields weighted for the scheduled maturity of each security. Tax-equivalent yields have been calculated using a 35% tax rate. With the exception of obligations of the U.S. Treasury and other U.S. government agencies and corporations, there were no investment securities of any single issuer, the book value of which exceeded 10% of stockholders' equity at December 31, 2017 . Investment securities carried at approximately $479 million and $509 million at December 31, 2017 and 2016 , respectively, were pledged to secure public deposits and repurchase agreements and for other purposes as permitted or required by law. The following table presents the aging of gross unrealized losses and fair value by investment category as of December 31, 2017 and 2016 (in thousands): Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2017 Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 58,584 $ (540 ) $ 47,972 $ (1,494 ) $ 106,556 $ (2,034 ) Obligations of states and political subdivisions 42,618 (769 ) 9,267 (256 ) 51,885 (1,025 ) Mortgage-backed securities: GSE residential 187,949 (1,942 ) 22,609 (518 ) 210,558 (2,460 ) Trust preferred securities — — 2,548 (345 ) 2,548 (345 ) Other securities — — — — — — Total $ 289,151 $ (3,251 ) $ 82,396 $ (2,613 ) $ 371,547 $ (5,864 ) Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 34,101 $ (525 ) $ 14,540 $ (453 ) $ 48,641 $ (978 ) December 31, 2016 U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 125,257 $ (2,508 ) $ — $ — $ 125,257 $ (2,508 ) Obligations of states and political subdivisions 93,405 (2,804 ) — — 93,405 (2,804 ) Mortgage-backed securities: GSE residential 266,319 (4,099 ) 5,878 (270 ) 272,197 (4,369 ) Trust preferred securities — — 1,652 (1,398 ) 1,652 (1,398 ) Other securities — — 1,995 (5 ) 1,995 (5 ) Total $ 484,981 $ (9,411 ) $ 9,525 $ (1,673 ) $ 494,506 $ (11,084 ) Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 53,295 $ (1,338 ) $ — $ — $ 53,295 $ (1,338 ) U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies. At December 31, 2017 , there were eleven available-for-sale U.S. Treasury securities and obligations of U.S. government corporations and agencies with a fair value of $47,972,000 and unrealized losses of $1,494,000 in a continuous unrealized loss position for twelve months or more. At December 31, 2016 there were no available-for-sale U.S. Treasury securities and obligations of U.S. government corporations and agencies in a continuous unrealized loss position for twelve months or more. At December 31, 2017 there were seven held-to-maturity U.S. Treasury securities and obligations of U.S. government corporations and agencies with a fair value of $14,540,000 and unrealized losses of $453,000 in a continuous unrealized loss position for twelve months or more. and December 31, 2016 there were no held-to maturity U.S. Treasury securities and obligations of U.S. government corporations and agencies in a continuous unrealized loss position for twelve months or more. Obligations of states and political subdivisions. At December 31, 2017 there were thirty-nine obligations of states and political subdivisions with a fair value of $9,267,000 and unrealized losses of $256,000 in a continuous unrealized loss position for twelve months or more. At December 31, 2016 , there were no obligations of states and political subdivisions in a continuous unrealized loss position for twelve months or more. Mortgage-backed Securities: GSE Residential. At December 31, 2017 there were twenty-six mortgage-backed securities with a fair value of $22,609,000 and unrealized losses of $518,000 in a continuous unrealized loss position for twelve months or more. At December 31, 2016 , there were two mortgage-backed security with a fair value of $5,878,000 and unrealized losses of $270,000 in a continuous unrealized loss position for twelve months or more. Trust Preferred Securities. At December 31, 2017 , there was one trust preferred security with a fair value of $2,548,000 and unrealized losses of $345,000 in a continuous unrealized loss position for twelve months or more. At December 31, 2016 , there was one trust preferred securities with a fair value of $1,652,000 and unrealized losses of $1,398,000 in a continuous unrealized loss position for twelve months or more. These unrealized losses were primarily due to the long-term nature of the trust preferred securities, a lack of demand or inactive market for these securities, the impending change to the regulatory treatment of these securities, and concerns regarding the underlying financial institutions that have issued the trust preferred securities. The Company recorded no other-than-temporary impairment (OTTI) for these securities during 2017 or 2016 . Because the Company does not intend to sell the remaining security and it is not more-likely-than-not that the Company will be required to sell this securities before recovery of its amortized cost basis, which may be maturity, the Company does not consider the remainder of the investment in this security to be other-than-temporarily impaired at December 31, 2017 . However, future downgrades or additional deferrals and defaults in the security could result in additional OTTI and consequently, have a material impact on future earnings. Following are the details for the impaired trust preferred security remaining as of December 31, 2017 (in thousands): Book Value Market Value Unrealized Gains (Losses) Other-than- temporary Impairment Recorded To-date PreTSL XXVIII $ 2,893 $ 2,548 $ (345 ) $ (1,111 ) Other secu rities. At December 31, 2017 there were no other securities in a continuous unrealized loss position for twelve months or more. At December 31, 2016, there was one other security with a fair value of $1,995,000 and unrealized losses of $5,000 in a continuous unrealized loss position for twelve months or more. The Company does not believe any other individual unrealized loss as of December 31, 2017 represents OTTI. However, given the continued disruption in the financial markets, the Company may be required to recognize OTTI losses in future periods with respect to its available for sale investment securities portfolio. The amount and timing of any additional OTTI will depend on the decline in the underlying cash flows of the securities. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss recognized in the period the other-than-temporary impairment is identified. Other-than-temporary Impairment Upon acquisition of a security, the Company determines whether it is within the scope of the accounting guidance for investments in debt and equity securities or whether it must be evaluated for impairment under the accounting guidance for beneficial interests in securitized financial assets. The Company conducts periodic reviews to evaluate its investment securities to determine whether OTTI has occurred. While all securities are considered, the securities primarily impacted by OTTI evaluation are pooled trust preferred securities. For the pooled trust preferred security currently in the investment portfolio, an extensive review is conducted to determine if any additional OTTI has occurred. The Company utilizes an independent third-party to perform the OTTI evaluation. The Company's management reviews the assumption inputs and methodology with the third-party to obtain an understanding of them and determine if they are appropriate for the evaluation. Economic models are used to project future cash flows for the security based on current assumptions for discount rate, prepayments, default and deferral rates and recoveries. These assumptions are determined based on the structure of the issuance, the specific collateral underlying the security, historical performance of trust preferred securities and general state of the economy. The OTTI test compares the present value of the cash flows from quarter to quarter to determine if there has been an adverse change which could indicate additional OTTI. The discount rate assumption used in the cash flow model is equal to the current yield used to accrete the beneficial interest. The Company’s current trust preferred security investment has a floating rate coupon of 3-month LIBOR plus 90 basis points . Since the estimate of 3-month LIBOR is based on the forward curve on the measurement date, and is therefore variable, the discount assumption for this security is a range of projected coupons over the expected life of the security. The Company considers the likelihood that issuers will prepay their securities which changes the amount of expected cash flows. Factors such as the coupon rates of collateral, economic conditions and regulatory changes, such as the Dodd-Frank Act and Basel III, are considered. The trust preferred security includes collateral issued by financial institutions and insurance companies. To identify bank issuers with a high risk of near term default or deferral, a credit model developed by the third-party is utilized that scores each bank issuer based on 29 different ratios covering capital adequacy, asset quality, earnings, liquidity, the Texas Ratio, and sensitivity to interest rates. To account for longer term bank default risk not captured by the credit model, it is assumed that banks will default at a rate of 2% annually for the first two years of the cash flow projection, and 36 basis points in each year thereafter. To project defaults for insurance issuers, each issuer’s credit rating is mapped to its idealized default rate, which is AM Best’s estimate of the historical default rate for insurance companies with that rating. Lastly, it is assumed that trust preferred securities issued by banks that have already failed will have no recoveries, and that banks projected to default will have recoveries of 10% . Additionally, the 10% recovery assumption, incorporates the potential for cures by banks that are currently in deferral. If the Company determines that a given pooled trust preferred security position will be subject to a write-down or loss, the Company records the expected credit loss as a charge to earnings. Credit Losses Recognized on Investments As described above, some of the Company’s investments in trust preferred securities have experienced fair value deterioration due to credit losses but are not otherwise other-than-temporarily impaired. The following table provides information about those trust preferred securities for which only a credit loss was recognized in income and other losses are recorded in other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015 (in thousands). Accumulated Credit Losses as of December 31: 2017 2016 2015 Credit losses on trust preferred securities held: Beginning of period $ 1,111 $ 1,111 $ 1,111 Additions related to OTTI losses not previously recognized — — — Reductions due to sales / (recoveries) — — — Reductions due to change in intent or likelihood of sale — — — Additions related to increases in previously recognized OTTI losses — — — Reductions due to increases in expected cash flows — — — End of period $ 1,111 $ 1,111 $ 1,111 Maturities of investment securities were as follows at December 31, 2017 (in thousands): Amortized Cost Estimated Fair Value Available-for-sale: Due in one year or less $ 88,726 $ 87,358 Due after one-five years 114,719 114,825 Due after five-ten years 77,765 78,246 Due after ten years 4,555 4,339 285,765 284,768 Mortgage-backed securities: GSE residential 295,778 293,811 Total available-for-sale 581,543 578,579 Held-to-maturity: Due in one year or less 39,993 39,105 Due after one-five years 29,339 29,352 Due after five-ten years — — Due after ten years — — Total held-to-maturity 69,332 $ 68,457 Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans and Allowance for Loan Losses	90 days & Accruing December 31, 2017 Construction and land development $ 26 $ 48 $ — $ 74 $ 107,520 $ 107,594 $ — Farm loans — — 396 396 126,787 127,183 — 1-4 Family residential properties 3,023 538 1,767 5,328 288,339 293,667 — Multifamily residential properties — — — — 61,798 61,798 — Commercial real estate 90 38 3,566 3,694 678,063 681,757 — Loans secured by real estate 3,139 624 5,729 9,492 1,262,507 1,271,999 — Agricultural loans — 32 158 190 86,441 86,631 — Commercial and industrial loans 192 3 770 965 443,298 444,263 — Consumer loans 178 67 27 272 29,477 29,749 — All other loans — — — — 106,859 106,859 — Total loans $ 3,509 $ 726 $ 6,684 $ 10,919 $ 1,928,582 $ 1,939,501 $ — December 31, 2016 Construction and land development $ — $ — $ — $ — $ 49,104 $ 49,104 $ — Farm loans — 131 293 424 125,684 126,108 — 1-4 Family residential properties 1,854 713 1,008 3,575 322,840 326,415 105 Multifamily residential properties — — 240 240 82,960 83,200 — Commercial real estate 1,662 716 43 2,421 627,714 630,135 — Loans secured by real estate 3,516 1,560 1,584 6,660 1,208,302 1,214,962 105 Agricultural loans 365 84 37 486 86,199 86,685 — Commercial and industrial loans 395 155 249 799 408,234 409,033 — Consumer loans 192 37 11 240 37,788 38,028 — All other loans — — — — 77,284 77,284 — Total loans $ 4,468 $ 1,836 $ 1,881 $ 8,185 $ 1,817,807 $ 1,825,992 $ 105 Impaired Loans Within all loan portfolio segments, loans are considered impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due from the borrower in accordance with the contractual terms of the loan. The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified due date. Impaired loans, excluding certain troubled debt restructured loans, are placed on nonaccrual status. Impaired loans include nonaccrual loans and loans modified in troubled debt restructurings where concessions have been granted to borrowers experiencing financial difficulties. These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance or other actions intended to maximize collection. It is the Company’s policy to have any restructured loans which are on nonaccrual status prior to being modified remain on nonaccrual status until, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal. If the restructured loan is on accrual status prior to being modified, the loan is reviewed to determine if the modified loan should remain on accrual status. The following tables present impaired loans as of December 31, 2017 and 2016 (in thousands): 2017 2016 Recorded Balance Unpaid Principal Balance Specific Allowance Recorded Balance Unpaid Principal Balance Specific Allowance Loans with a specific allowance: Construction and land development $ — $ — $ — $ 227 $ 227 $ — Farm loans 276 276 — — — — 1-4 Family residential properties 1,026 1,347 25 997 997 6 Multifamily residential properties 313 313 — 528 528 — Commercial real estate 5,544 5,565 531 863 884 — Loans secured by real estate 7,159 7,501 556 2,615 2,636 6 Agricultural loans 212 1,009 2 1,345 1,345 660 Commercial and industrial loans 5,774 6,037 64 1,093 1,191 192 Consumer loans 200 200 1 213 213 — All other loans — — — — — — Total loans $ 13,345 $ 14,747 $ 623 $ 5,266 $ 5,385 $ 858 Loans without a specific allowance: Construction and land development $ — $ — $ — $ — $ — $ — Farm loans 15 15 — 205 207 — 1-4 Family residential properties 2,239 2,664 — 2,497 3,207 — Multifamily residential properties 55 55 — 3,419 3,547 — Commercial real estate 303 368 — 6,224 6,802 — Loans secured by real estate 2,612 3,102 — 12,345 13,763 — Agricultural loans 545 — — 43 66 — Commercial and industrial loans 909 1,249 — 378 572 — Consumer loans 102 119 — 206 211 — All other loans — — — — — — Total loans $ 4,168 $ 4,470 $ — $ 12,972 $ 14,612 $ — Total loans: Construction and land development $ — $ — $ — $ 227 $ 227 $ — Farm loans 291 291 — 205 207 — 1-4 Family residential properties 3,265 4,011 25 3,494 4,204 6 Multifamily residential properties 368 368 — 3,947 4,075 — Commercial real estate 5,847 5,933 531 7,087 7,686 — Loans secured by real estate 9,771 10,603 556 14,960 16,399 6 Agricultural loans 757 1,009 2 1,388 1,411 660 Commercial and industrial loans 6,683 7,286 64 1,471 1,763 192 Consumer loans 302 319 1 419 424 — All other loans — — — — — — Total loans $ 17,513 $ 19,217 $ 623 $ 18,238 $ 19,997 $ 858 The Company’s policy is to discontinue the accrual of interest income on all loans for which principal or interest is ninety days past due. The accrual of interest is discontinued earlier when, in the opinion of management, there is reasonable doubt as to the timely collection of interest or principal. Once interest accruals are discontinued, accrued but uncollected interest is charged against current year income. Subsequent receipts on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Interest on loans determined to be troubled debt restructurings is recognized on an accrual basis in accordance with the restructured terms if the loan is in compliance with the modified terms. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal. The Company requires a period of satisfactory performance of not less than six months before returning a nonaccrual loan to accrual status. The following tables present average recorded investment and interest income recognized on impaired loans for the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Average Investment in Impaired Loans Interest Income Recognized Average Investment in Impaired Loans Interest Income Recognized Average Investment in Impaired Loans Interest Income Recognized Construction and land development $ — $ — $ 229 $ — $ 142 $ — Farm loans 293 — 207 — 527 2 1-4 Family residential properties 3,267 29 2,988 22 1,440 14 Multifamily residential properties 377 1 3,824 55 323 — Commercial real estate 5,457 13 6,675 36 310 2 Loans secured by real estate 9,394 43 13,923 113 2,742 18 Agricultural loans 878 — 1,394 — 82 — Commercial and industrial loans 6,586 8 1,485 4 1,569 8 Consumer loans 325 — 557 2 319 2 All other loans — — — — — — Total loans $ 17,183 $ 51 $ 17,359 $ 119 $ 4,712 $ 28 The amount of interest income recognized by the Company within the periods stated above was due to loans modified in a troubled debt restructuring that remained on accrual status. The balance of loans modified in a troubled debt restructuring included in the impaired loans stated above that were still accruing was $578,000 of 1-4 Family residential properties, $251,000 of commercial real estate, and $25,000 of commercial and industrial loans at December 31, 2017 and $603,000 of 1-4 Family residential properties, $3,419,000 of multifamily residential properties, $2,116,000 of commercial real estate loans, $41,000 of commercial and industrial loans and $6,000 of consumer loans at December 31, 2016 . For the years ended December 31, 2017, 2016 and 2015 , the amount of interest income recognized using a cash-basis method of accounting during the period that the loans were impaired was not material. Non Accrual Loans The following table presents the Company’s recorded balance of nonaccrual loans at December 31, 2017 and December 31, 2016 (in thousands). This table excludes purchased credit-impaired loans and performing troubled debt restructurings. 2017 2016 Construction and land development $ — $ 227 Farm loans 291 205 1-4 Family residential properties 2,687 2,890 Multifamily residential properties 368 528 Commercial real estate 5,596 4,971 Loans secured by real estate 8," id="sjs-B4">Loans are stated at the principal amount outstanding net of unearned discounts, unearned income and allowance for loan losses. Unearned income includes deferred loan origination fees reduced by loan origination costs and is amortized to interest income over the life of the related loan using methods that approximated the effective interest rate method. Interest on substantially all loans is credited to income based on the principal amount outstanding. A summary of loans at December 31, 2017 and 2016 follows (in thousands): 2017 2016 Construction and land development $ 107,721 $ 49,366 Farm loans 127,232 126,216 1-4 Family residential properties 294,483 328,119 Multifamily residential properties 61,966 83,478 Commercial real estate 684,639 633,694 Loans secured by real estate 1,276,041 1,220,873 Agricultural loans 86,602 86,735 Commercial and industrial loans 445,378 412,637 Consumer loans 30,070 38,404 All other loans 108,023 77,602 Gross loans 1,946,114 1,836,251 Less: Loans held for sale 1,025 1,175 1,945,089 1,835,076 Less: Net deferred loan fees, premiums and discounts 6,613 10,259 Allowance for loan losses 19,977 16,753 Net loans $ 1,918,499 $ 1,808,064 Net loans increased $110.4 million as of December 31, 2017 compared to December 31, 2016. The increase is primarily due to increases in construction and land development, commercial real estate, and commercial and industrial loans offset by decreases in 1-4 family and multifamily residential properties. Loans expected to be sold are classified as held for sale in the consolidated financial statements and are recorded at the lower of aggregate cost or market value, taking into consideration future commitments to sell the loans. These loans are primarily for 1-4 family residential properties. The balance of loans held for sale, excluded from the balances above, were $1,025,000 and $1,175,000 at December 31, 2017 and 2016 , respectively. Most of the Company’s business activities are with customers located within central Illinois. At December 31, 2017 , the Company’s loan portfolio included $213.8 million of loans to borrowers whose businesses are directly related to agriculture. Of this amount, $170.8 million was concentrated in other grain farming. Total loans to borrowers whose businesses are directly related to agriculture increased $1.0 million from $212.8 million at December 31, 2016 while loans concentrated in other grain farming decreased $0.5 million from $171.3 million at December 31, 2016 . While the Company adheres to sound underwriting practices, including collateralization of loans, any extended period of low commodity prices, drought conditions, significantly reduced yields on crops and/or reduced levels of government assistance to the agricultural industry could result in an increase in the level of problem agriculture loans and potentially result in loan losses within the agricultural portfolio. In addition, the Company has $131.7 million of loans to motels and hotels. The performance of these loans is dependent on borrower specific issues as well as the general level of business and personal travel within the region. While the Company adheres to sound underwriting standards, a prolonged period of reduced business or personal travel could result in an increase in nonperforming loans to this business segment and potentially in loan losses. The Company also has $186.0 million of loans to lessors of non-residential buildings, $131.8 million of loans to lessors of residential buildings and dwellings, and $95.7 million of loans to other gambling industries. The structure of the Company’s loan approval process is based on progressively larger lending authorities granted to individual loan officers, loan committees, and ultimately the board of directors. Outstanding balances to one borrower or affiliated borrowers are limited by federal regulation; however, limits well below the regulatory thresholds are generally observed. The vast majority of the Company’s loans are to businesses located in the geographic market areas served by the Company’s branch bank system. Additionally, a significant portion of the collateral securing the loans in the portfolio is located within the Company’s primary geographic footprint. In general, the Company adheres to loan underwriting standards consistent with industry guidelines for all loan segments. The Company’s lending can be summarized into the following primary areas: Commercial Real Estate Loans. Commercial real estate loans are generally comprised of loans to small business entities to purchase or expand structures in which the business operations are housed, loans to owners of real estate who lease space to non-related commercial entities, loans for construction and land development, loans to hotel operators, and loans to owners of multi-family residential structures, such as apartment buildings. Commercial real estate loans are underwritten based on historical and projected cash flows of the borrower and secondarily on the underlying real estate pledged as collateral on the debt. For the various types of commercial real estate loans, minimum criteria have been established within the Company’s loan policy regarding debt service coverage while maximum limits on loan-to-value and amortization periods have been defined. Maximum loan-to-value ratios range from 65% to 80% depending upon the type of real estate collateral, while the desired minimum debt coverage ratio is 1.20x . Amortization periods for commercial real estate loans are generally limited to twenty years . The Company’s commercial real estate portfolio is well below the thresholds that would designate a concentration in commercial real estate lending, as established by the federal banking regulators. Commercial and Industrial Loans. Commercial and industrial loans are primarily comprised of working capital loans used to purchase inventory and fund accounts receivable that are secured by business assets other than real estate. These loans are generally written for one year or less. Also, equipment financing is provided to businesses with these loans generally limited to 80% of the value of the collateral and amortization periods limited to seven years . Commercial loans are often accompanied by a personal guaranty of the principal owners of a business. Like commercial real estate loans, the underlying cash flow of the business is the primary consideration in the underwriting process. The financial condition of commercial borrowers is monitored at least annually with the type of financial information required determined by the size of the relationship. Measures employed by the Company for businesses with higher risk profiles include the use of government-assisted lending programs through the Small Business Administration and U.S. Department of Agriculture. Agricultural and Agricultural Real Estate Loans. Agricultural loans are generally comprised of seasonal operating lines to cash grain farmers to plant and harvest corn and soybeans and term loans to fund the purchase of equipment. Agricultural real estate loans are primarily comprised of loans for the purchase of farmland. Specific underwriting standards have been established for agricultural-related loans including the establishment of projections for each operating year based on industry developed estimates of farm input costs and expected commodity yields and prices. Operating lines are typically written for one year and secured by the crop. Loan-to-value ratios on loans secured by farmland generally do not exceed 65% and have amortization periods limited to twenty five years . Federal government-assistance lending programs through the Farm Service Agency are used to mitigate the level of credit risk when deemed appropriate. Residential Real Estate Loans. Residential real estate loans generally include loans for the purchase or refinance of residential real estate properties consisting of one-to-four units and home equity loans and lines of credit. The Company sells the vast majority of its long-term fixed rate residential real estate loans to secondary market investors. The Company also releases the servicing of these loans upon sale. The Company retains all residential real estate loans with balloon payment features. Balloon periods are limited to five years . Residential real estate loans are typically underwritten to conform to industry standards including criteria for maximum debt-to-income and loan-to-value ratios as well as minimum credit scores. Loans secured by first liens on residential real estate held in the portfolio typically do not exceed 80% of the value of the collateral and have amortization periods of twenty five years or less. The Company does not originate subprime mortgage loans. Consumer Loans. Consumer loans are primarily comprised of loans to individuals for personal and household purposes such as the purchase of an automobile or other living expenses. Minimum underwriting criteria have been established that consider credit score, debt-to-income ratio, employment history, and collateral coverage. Typically, consumer loans are set up on monthly payments with amortization periods based on the type and age of the collateral. Other Loans. Other loans consist primarily of loans to municipalities to support community projects such as infrastructure improvements or equipment purchases. Underwriting guidelines for these loans are consistent with those established for commercial loans with the additional repayment source of the taxing authority of the municipality. Purchase Credit-Impaired Loans. Loans acquired with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit impaired. Evidence of credit quality deterioration as of the purchase date may include information such as past-due and nonaccrual status, borrower credit scores and recent loan to value percentages. Purchase credit-impaired ("PCI") loans are accounted for under ASC 310-30, Receivables--Loans and Debt Securities Acquired with Deteriorated Credit Quality ("ASC 310-30"), and are initially measured at fair value, which includes the estimated future credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for credit losses related to these loans is not carried over and recorded at the acquisition date. The cash flows expected to be collected were estimated using current key assumptions, such as default rates, value of underlying collateral, severity and prepayment speeds. Allowance for Loan Losses The allowance for loan losses represents the Company’s best estimate of the reserve necessary to adequately account for probable losses existing in the current portfolio. The provision for loan losses is the charge against current earnings that is determined by the Company as the amount needed to maintain an adequate allowance for loan losses. In determining the adequacy of the allowance for loan losses, and therefore the provision to be charged to current earnings, the Company relies predominantly on a disciplined credit review and approval process that extends to the full range of the Company’s credit exposure. The review process is directed by the overall lending policy and is intended to identify, at the earliest possible stage, borrowers who might be facing financial difficulty. Factors considered by the Company in evaluating the overall adequacy of the allowance include historical net loan losses, the level and composition of nonaccrual, past due and troubled debt restructurings, trends in volumes and terms of loans, effects of changes in risk selection and underwriting standards or lending practices, lending staff changes, concentrations of credit, industry conditions and the current economic conditions in the region where the Company operates. The Company estimates the appropriate level of allowance for loan losses by separately evaluating large impaired loans and nonimpaired loans. The Company has loans acquired from business combinations with uncollected principal balances. These loans are carried net of a fair value adjustment for credit risk and interest rates and are only included in the allowance calculation to the extent that the reserve requirement exceeds the fair value adjustment. However, as the acquired loans renew, it is necessary to establish an allowance which represents an amount that, in management’s opinion, will be adequate to absorb probable credit losses inherent in such loans. Impaired loans. The Company individually evaluates certain loans for impairment. In general, these loans have been internally identified via the Company’s loan grading system as credits requiring management’s attention due to underlying problems in the borrower’s business or collateral concerns. This evaluation considers expected future cash flows, the value of collateral and also other factors that may impact the borrower’s ability to make payments when due. For loans greater than $250,000 impairment is individually measured each quarter using one of three alternatives: (1) the present value of expected future cash flows discounted at the loan’s effective interest rate; (2) the loan’s observable market price, if available; or (3) the fair value of the collateral less costs to sell for collateral dependent loans and loans for which foreclosure is deemed to be probable. A specific allowance is assigned when expected cash flows or collateral do not justify the carrying amount of the loan. The carrying value of the loan reflects reductions from prior charge-offs. Non-Impaired loans. Non-impaired loans comprise the vast majority of the Company’s total loan portfolio and include loans in accrual status and those credits not identified as troubled debt restructurings. A small portion of these loans are considered “criticized” due to the risk rating assigned reflecting elevated credit risk due to characteristics, such as a strained cash flow position, associated with the individual borrowers. Criticized loans are those assigned risk ratings of Watch, Substandard, or Doubtful. Determining the appropriate level of the allowance for loan losses for all non-impaired loans is based on a migration analysis of net losses over a rolling twelve quarter period by loan segment. A weighted average of the net losses is determined by assigning more weight to the most recent quarters in order to recognize current risk factors influencing the various segments of the loan portfolio more prominently than past periods. Environmental factors including changes in economic conditions, changes in credit policies or underwriting standards, and changes in the level of credit risk associated with specific industries and markets are evaluated each quarter to determine if adjustments to the weighted average historical net losses is appropriate given these current influences on the risk profile of each loan segment. Because the economic and business climate in any given industry or market, and its impact on any given borrower, can change rapidly, the risk profile of the loan portfolio is periodically assessed and adjusted when appropriate. Consumer loans are evaluated for adverse classification based primarily on the Uniform Retail Credit Classification and Account Management Policy established by the federal banking regulators. Classification standards are generally based on delinquency status, collateral coverage, bankruptcy and the presence of fraud. Due to weakened economic conditions during recent years, the Company established qualitative factor adjustments for each of the loan segments at levels above the historical net loss averages. Some of the economic factors included the potential for reduced cash flow for commercial operating loans from reduction in sales or increased operating costs, decreased occupancy rates for commercial buildings, reduced levels of home sales for commercial land developments, the uncertainty regarding grain prices and increased operating costs for farmers, and increased levels of unemployment and bankruptcy impacting consumer’s ability to pay. Each of these economic uncertainties was taken into consideration in developing the level of the allowance for loan losses. The Company has not materially changed any aspect of its overall approach in the determination of the allowance for loan losses. However, on an on-going basis the Company continues to refine the methods used in determining management’s best estimate of the allowance for loan losses. The following tables present the balance in the allowance for loan losses and the recorded investment in loans based on portfolio segment and impairment method as of December 31, 2017, 2016 and 2015 (in thousands): Commercial/ Commercial Real Estate Agricultural/ Agricultural Real Estate Residential Real Estate Consumer Unallocated Total December 31, 2017 Allowance for loan losses: Balance, beginning of year $ 12,901 $ 2,249 $ 874 $ 693 $ 36 $ 16,753 Provision charged to expense 6,884 153 100 361 (36 ) 7,462 Losses charged off (3,795 ) (662 ) (217 ) (521 ) — (5,195 ) Recoveries 556 2 129 270 — 957 Balance, end of period $ 16,546 $ 1,742 $ 886 $ 803 $ — $ 19,977 Ending balance: Individually evaluated for impairment $ 586 $ 2 $ 25 $ 1 $ — $ 614 Collectively evaluated for impairment $ 15,951 $ 1,740 $ 861 $ 802 $ — $ 19,354 Loans acquired with deteriorated credit quality $ 9 $ — $ — $ — $ — $ 9 Loans: Ending balance $ 1,371,787 $ 213,521 $ 315,123 $ 39,070 $ — $ 1,939,501 Ending Balance: Individually evaluated for impairment $ 11,372 $ 488 $ 1,026 $ 200 $ — $ 13,086 Collectively evaluated for impairment $ 1,360,156 $ 213,033 $ 314,097 $ 38,870 $ — $ 1,926,156 Loans acquired with deteriorated credit quality $ 259 $ — $ — $ — $ — $ 259 Commercial/ Commercial Real Estate Agricultural/ Agricultural Real Estate Residential Real Estate Consumer Unallocated Total December 31, 2016 Allowance for loan losses: Balance, beginning of year $ 11,379 $ 1,337 $ 994 $ 642 $ 224 $ 14,576 Provision charged to expense 1,467 933 113 501 (188 ) 2,826 Losses charged off (747 ) (30 ) (234 ) (664 ) — (1,675 ) Recoveries 802 9 1 214 — 1,026 Balance, end of period $ 12,901 $ 2,249 $ 874 $ 693 $ 36 $ 16,753 Ending balance: Individually evaluated for impairment $ 192 $ 660 $ 6 $ — $ — $ 858 Collectively evaluated for impairment $ 12,695 $ 1,589 $ 868 $ 693 $ 36 $ 15,881 Loans: Ending balance $ 1,204,799 $ 212,513 $ 366,823 $ 41,857 $ — $ 1,825,992 Ending balance: Individually evaluated for impairment $ 1,956 $ 1,345 $ 1,752 $ 213 $ — $ 5,266 Collectively evaluated for impairment $ 1,199,003 $ 211,168 $ 360,825 $ 41,644 $ — $ 1,812,640 Loans acquired with deteriorated credit quality $ 3,840 $ — $ 4,246 $ — $ — $ 8,086 December 31, 2015 Allowance for loan losses: Balance, beginning of year $ 10,914 $ 1,360 $ 790 $ 386 $ 232 $ 13,682 Provision charged to expense 451 (25 ) 267 633 (8 ) 1,318 Losses charged off (289 ) — (64 ) (553 ) — (906 ) Recoveries 303 2 1 176 — 482 Balance, end of year $ 11,379 $ 1,337 $ 994 $ 642 $ 224 $ 14,576 Ending balance: Individually evaluated for impairment $ 134 $ — $ — $ — $ — $ 134 Collectively evaluated for impairment $ 11,245 $ 1,337 $ 994 $ 642 $ 224 $ 14,442 Loans: Ending balance $ 807,736 $ 198,066 $ 232,348 $ 43,739 $ — $ 1,281,889 Ending balance: Individually evaluated for impairment $ 744 $ 430 $ — $ — $ — $ 1,174 Collectively evaluated for impairment $ 806,992 $ 197,636 $ 232,348 $ 43,739 $ — $ 1,280,715 Consistent with regulatory guidance, charge-offs on all loan segments are taken when specific loans, or portions thereof, are considered uncollectible. The Company’s policy is to promptly charge these loans off in the period the uncollectible loss is reasonably determined. For all loan portfolio segments except 1-4 family residential properties and consumer, the Company promptly charges-off loans, or portions thereof, when available information confirms that specific loans are uncollectible based on information that includes, but is not limited to, (1) the deteriorating financial condition of the borrower, (2) declining collateral values, and/or (3) legal action, including bankruptcy, that impairs the borrower’s ability to adequately meet its obligations. For impaired loans that are considered to be solely collateral dependent, a partial charge-off is recorded when a loss has been confirmed by an updated appraisal or other appropriate valuation of the collateral. The Company charges-off 1-4 family residential and consumer loans, or portions thereof, when the Company reasonably determines the amount of the loss. The Company adheres to timeframes established by applicable regulatory guidance which provides for the charge-down of 1-4 family first and junior lien mortgages to the net realizable value less costs to sell when the loan is 180 days past due, charge-off of unsecured open-end loans when the loan is 180 days past due, and charge down to the net realizable value when other secured loans are 120 days past due. Loans at these respective delinquency thresholds for which the Company can clearly document that the loan is both well-secured and in the process of collection, such that collection will occur regardless of delinquency status, need not be charged off. Credit Quality The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, collateral support, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis is performed on a continuous basis. The Company uses the following definitions for risk ratings, which are commensurate with a loan considered "criticized": Special Mention. Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. Substandard. Loans classified as substandard are inadequately protected by the current sound-worthiness and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful. Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing factors, conditions and values, highly questionable and improbable. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered pass rated loans. The following tables present the credit risk profile of the Company’s loan portfolio based on rating category and payment activity as of December 31, 2017 and 2016 (in thousands): Construction & Land Development Farm Loans 1-4 Family Residential Properties Multifamily Residential Properties 2017 2016 2017 2016 2017 2016 2017 2016 Pass $ 107,140 $ 48,877 $ 120,767 $ 118,934 $ 282,441 $ 318,921 $ 60,954 $ 81,018 Special Mention 454 — 4,829 5,190 2,654 918 476 1,651 Substandard — 227 1,587 1,984 8,572 6,576 368 531 Doubtful — — — — — — — — Total $ 107,594 $ 49,104 $ 127,183 $ 126,108 $ 293,667 $ 326,415 $ 61,798 $ 83,200 Commercial Real Estate (Nonfarm/Nonresidential) Agricultural Loans Commercial & Industrial Loans Consumer Loans 2017 2016 2017 2016 2017 2016 2017 2016 Pass $ 647,208 $ 610,025 $ 83,469 $ 81,922 $ 425,846 $ 397,762 $ 29,375 $ 37,624 Special Mention 16,941 5,229 2,304 3,271 11,492 8,485 5 17 Substandard 17,608 14,881 858 1,492 6,925 2,786 369 387 Doubtful — — — — — — — — Total $ 681,757 $ 630,135 $ 86,631 $ 86,685 $ 444,263 $ 409,033 $ 29,749 $ 38,028 All Other Loans Total Loans 2017 2016 2017 2016 Pass $ 103,339 $ 74,377 $ 1,860,539 $ 1,769,460 Special Mention 3,520 2,892 42,675 27,653 Substandard — 15 36,287 28,879 Doubtful — — — — Total $ 106,859 $ 77,284 $ 1,939,501 $ 1,825,992 The following table presents the Company’s loan portfolio aging analysis at December 31, 2017 and 2016 (in thousands): 30-59 days Past Due 60-89 days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Total Loans > 90 days & Accruing December 31, 2017 Construction and land development $ 26 $ 48 $ — $ 74 $ 107,520 $ 107,594 $ — Farm loans — — 396 396 126,787 127,183 — 1-4 Family residential properties 3,023 538 1,767 5,328 288,339 293,667 — Multifamily residential properties — — — — 61,798 61,798 — Commercial real estate 90 38 3,566 3,694 678,063 681,757 — Loans secured by real estate 3,139 624 5,729 9,492 1,262,507 1,271,999 — Agricultural loans — 32 158 190 86,441 86,631 — Commercial and industrial loans 192 3 770 965 443,298 444,263 — Consumer loans 178 67 27 272 29,477 29,749 — All other loans — — — — 106,859 106,859 — Total loans $ 3,509 $ 726 $ 6,684 $ 10,919 $ 1,928,582 $ 1,939,501 $ — December 31, 2016 Construction and land development $ — $ — $ — $ — $ 49,104 $ 49,104 $ — Farm loans — 131 293 424 125,684 126,108 — 1-4 Family residential properties 1,854 713 1,008 3,575 322,840 326,415 105 Multifamily residential properties — — 240 240 82,960 83,200 — Commercial real estate 1,662 716 43 2,421 627,714 630,135 — Loans secured by real estate 3,516 1,560 1,584 6,660 1,208,302 1,214,962 105 Agricultural loans 365 84 37 486 86,199 86,685 — Commercial and industrial loans 395 155 249 799 408,234 409,033 — Consumer loans 192 37 11 240 37,788 38,028 — All other loans — — — — 77,284 77,284 — Total loans $ 4,468 $ 1,836 $ 1,881 $ 8,185 $ 1,817,807 $ 1,825,992 $ 105 Impaired Loans Within all loan portfolio segments, loans are considered impaired when, based on current information and events, it is probable the Company will be unable to collect all amounts due from the borrower in accordance with the contractual terms of the loan. The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified due date. Impaired loans, excluding certain troubled debt restructured loans, are placed on nonaccrual status. Impaired loans include nonaccrual loans and loans modified in troubled debt restructurings where concessions have been granted to borrowers experiencing financial difficulties. These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance or other actions intended to maximize collection. It is the Company’s policy to have any restructured loans which are on nonaccrual status prior to being modified remain on nonaccrual status until, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal. If the restructured loan is on accrual status prior to being modified, the loan is reviewed to determine if the modified loan should remain on accrual status. The following tables present impaired loans as of December 31, 2017 and 2016 (in thousands): 2017 2016 Recorded Balance Unpaid Principal Balance Specific Allowance Recorded Balance Unpaid Principal Balance Specific Allowance Loans with a specific allowance: Construction and land development $ — $ — $ — $ 227 $ 227 $ — Farm loans 276 276 — — — — 1-4 Family residential properties 1,026 1,347 25 997 997 6 Multifamily residential properties 313 313 — 528 528 — Commercial real estate 5,544 5,565 531 863 884 — Loans secured by real estate 7,159 7,501 556 2,615 2,636 6 Agricultural loans 212 1,009 2 1,345 1,345 660 Commercial and industrial loans 5,774 6,037 64 1,093 1,191 192 Consumer loans 200 200 1 213 213 — All other loans — — — — — — Total loans $ 13,345 $ 14,747 $ 623 $ 5,266 $ 5,385 $ 858 Loans without a specific allowance: Construction and land development $ — $ — $ — $ — $ — $ — Farm loans 15 15 — 205 207 — 1-4 Family residential properties 2,239 2,664 — 2,497 3,207 — Multifamily residential properties 55 55 — 3,419 3,547 — Commercial real estate 303 368 — 6,224 6,802 — Loans secured by real estate 2,612 3,102 — 12,345 13,763 — Agricultural loans 545 — — 43 66 — Commercial and industrial loans 909 1,249 — 378 572 — Consumer loans 102 119 — 206 211 — All other loans — — — — — — Total loans $ 4,168 $ 4,470 $ — $ 12,972 $ 14,612 $ — Total loans: Construction and land development $ — $ — $ — $ 227 $ 227 $ — Farm loans 291 291 — 205 207 — 1-4 Family residential properties 3,265 4,011 25 3,494 4,204 6 Multifamily residential properties 368 368 — 3,947 4,075 — Commercial real estate 5,847 5,933 531 7,087 7,686 — Loans secured by real estate 9,771 10,603 556 14,960 16,399 6 Agricultural loans 757 1,009 2 1,388 1,411 660 Commercial and industrial loans 6,683 7,286 64 1,471 1,763 192 Consumer loans 302 319 1 419 424 — All other loans — — — — — — Total loans $ 17,513 $ 19,217 $ 623 $ 18,238 $ 19,997 $ 858 The Company’s policy is to discontinue the accrual of interest income on all loans for which principal or interest is ninety days past due. The accrual of interest is discontinued earlier when, in the opinion of management, there is reasonable doubt as to the timely collection of interest or principal. Once interest accruals are discontinued, accrued but uncollected interest is charged against current year income. Subsequent receipts on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Interest on loans determined to be troubled debt restructurings is recognized on an accrual basis in accordance with the restructured terms if the loan is in compliance with the modified terms. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal. The Company requires a period of satisfactory performance of not less than six months before returning a nonaccrual loan to accrual status. The following tables present average recorded investment and interest income recognized on impaired loans for the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Average Investment in Impaired Loans Interest Income Recognized Average Investment in Impaired Loans Interest Income Recognized Average Investment in Impaired Loans Interest Income Recognized Construction and land development $ — $ — $ 229 $ — $ 142 $ — Farm loans 293 — 207 — 527 2 1-4 Family residential properties 3,267 29 2,988 22 1,440 14 Multifamily residential properties 377 1 3,824 55 323 — Commercial real estate 5,457 13 6,675 36 310 2 Loans secured by real estate 9,394 43 13,923 113 2,742 18 Agricultural loans 878 — 1,394 — 82 — Commercial and industrial loans 6,586 8 1,485 4 1,569 8 Consumer loans 325 — 557 2 319 2 All other loans — — — — — — Total loans $ 17,183 $ 51 $ 17,359 $ 119 $ 4,712 $ 28 The amount of interest income recognized by the Company within the periods stated above was due to loans modified in a troubled debt restructuring that remained on accrual status. The balance of loans modified in a troubled debt restructuring included in the impaired loans stated above that were still accruing was $578,000 of 1-4 Family residential properties, $251,000 of commercial real estate, and $25,000 of commercial and industrial loans at December 31, 2017 and $603,000 of 1-4 Family residential properties, $3,419,000 of multifamily residential properties, $2,116,000 of commercial real estate loans, $41,000 of commercial and industrial loans and $6,000 of consumer loans at December 31, 2016 . For the years ended December 31, 2017, 2016 and 2015 , the amount of interest income recognized using a cash-basis method of accounting during the period that the loans were impaired was not material. Non Accrual Loans The following table presents the Company’s recorded balance of nonaccrual loans at December 31, 2017 and December 31, 2016 (in thousands). This table excludes purchased credit-impaired loans and performing troubled debt restructurings. 2017 2016 Construction and land development $ — $ 227 Farm loans 291 205 1-4 Family residential properties 2,687 2,890 Multifamily residential properties 368 528 Commercial real estate 5,596 4,971 Loans secured by real estate 8,

Premises and Equipment, Net (No

Premises and Equipment, Net (Notes)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment, Net	Premises and Equipment, Net Premises and equipment at December 31, 2017 and 2016 consisted of (in thousands): 2017 2016 Land $ 9,933 $ 5,837 Buildings and improvements 37,229 44,484 Furniture and equipment 16,145 18,340 Leasehold improvements 4,109 4,089 Construction in progress 29 286 Subtotal 67,445 73,036 Accumulated depreciation and amortization 29,179 32,744 Total $ 38,266 $ 40,292 Depreciation and amortization expense was $2.7 million , $2.5 million and $2.2 million for the years ended December 31, 2017 , 2016 and 2015 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The Company has goodwill from business combinations, intangible assets from branch acquisitions, identifiable intangible assets assigned to core deposit relationships and customer lists of insurance agencies acquired. The following table presents gross carrying amount and accumulated amortization by major intangible asset class as of December 31, 2017 and 2016 (in thousands): 2017 2016 Gross Carrying Value Accumulated Amortization Gross Carrying Value Accumulated Amortization Goodwill not subject to amortization $ 63,910 $ 3,760 $ 61,551 $ 3,760 Intangibles from branch acquisition 3,015 3,015 3,015 3,015 Core deposit intangibles 19,862 11,473 19,862 9,644 Customer list intangibles 3,731 2,285 3,731 2,102 $ 90,518 $ 20,533 $ 88,159 $ 18,521 During the third quarter of 2016, goodwill of $16.8 million was provisionally recorded for the acquisition of First Clover Leaf. Goodwill was adjusted to $19.1 million within the twelve month measurement period to reflect information collected through that period to record goodwill. The measurement period adjustment also increased other liabilities by $2 million and decreased other assets by $.3 million . The goodwill consists largely of the synergies and economies of scale expected from combining the operations of First Clover Leaf Bank with First Mid Bank. All of the goodwill was assigned to the banking segment of the Company. The Company expects this goodwill will not be deductible for tax purposes. The following table provides a reconciliation of the purchase price paid for First Clover Leaf and the amount of goodwill recorded (in thousands): Purchase price $ 8,741 Less purchase accounting adjustments: Fair value of securities 737 Fair value of loans 3,475 Fair value of OREO 754 Fair value of premises and equipment (1,963 ) Fair value of time deposits 1,994 Fair value of FHLB advances 113 Fair value of subordinated debentures (731 ) Core deposit intangible (4,660 ) Other Assets 10,683 10,402 Resulting goodwill from acquisition $ 19,143 As part of the acquisition of First Clover Leaf Bank, the Company acquired mortgage servicing righted valued at $1,069,000 . The following table summarizes the activity pertaining to the mortgage servicing rights included in intangible assets as of December 31, 2017 and 2016 (in thousands): December 31, 2017 December 31, 2016 Beginning Balance 985 — Acquired Balance — 1,069 Mortgage Servicing rights capitalized — 14 Mortgage Servicing rights amortized (141 ) (98 ) Ending Balance $ 844 $ 985 Total amortization expense for the years ended December 31, 2017, 2016 and 2015 was as follows (in thousands): 2017 2016 2015 Core deposit intangibles 1,829 1,628 876 Customer list intangibles 183 183 15 Mortgage Servicing Rights 141 98 — $ 2,153 $ 1,909 $ 891 Estimated amortization expense for each of the five succeeding years is shown in the table below (in thousands): For year ended 12/31/18 $ 1,954 For year ended 12/31/19 1,778 For year ended 12/31/20 1,576 For year ended 12/31/21 1,304 For year ended 12/31/22 1,195 In accordance with the provisions of SFAS 142,”Goodwill and Other Intangible Assets,” codified in ASC 350, the Company performed testing of goodwill for impairment as of September 30, 2017 and 2016 , and determined, as of each of these dates, that goodwill was not impaired. Management also concluded that the remaining amounts and amortization periods were appropriate for all intangible assets.

Deposits (Notes)

Deposits (Notes)	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	Deposits As of December 31, 2017 and 2016 , deposits consisted of the following (in thousands): 2017 2016 Demand deposits: Non-interest bearing $ 480,283 $ 471,206 Interest-bearing 700,376 716,204 Savings 359,065 356,740 Money market 390,880 432,656 Time deposits 344,035 353,081 Total deposits $ 2,274,639 $ 2,329,887 Total interest expense on deposits for the years ended December 31, 2017, 2016 and 2015 was as follows (in thousands): 2017 2016 2015 Interest-bearing demand $ 588 $ 274 $ 117 Savings 486 445 398 Money market 1,224 719 605 Time deposits 1,697 1,275 1,162 Total $ 3,995 $ 2,713 $ 2,282 As of December 31, 2017, 2016 and 2015 , the aggregate amount of time deposits in denominations of more than $100,000 and the total interest expense on such deposits was as follows (in thousands): 2017 2016 2015 Outstanding $ 167,073 $ 151,262 $ 88,855 Interest expense for the year 730 423 493 The following table shows the amount of maturities for all time deposits as of December 31, 2017 (in thousands): Less than 1 year $ 224,622 1 year to 2 years 55,529 2 years to 3 years 35,529 3 years to 4 years 15,568 4 years to 5 years 11,914 Over 5 years 873 Total $ 344,035 In 2017 the Company maintained account relationships with various public entities throughout its market areas. These public entities had total balances of approximately $100.8 million and $146.1 million in various checking accounts and time deposits as of December 31, 2017 and 2016 , respectively. These balances are subject to change depending upon the cash flow needs of the public entity.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Borrowings	Aggregate annual maturities of FHLB advances and subordinated debentures (excluding unamortized discounts and premiums) at December 31, 2017 are (in thousands): FHLB Subordinated Debentures 2018 $ 25,000 $ — 2019 5,000 — 2020 15,000 — 2021 10,000 — 2022 — — Thereafter 5,000 24,620 $ 60,000 $ 24,620 Unamortized premium (discount) $ 38 $ (620 ) $ 60,038 $ 24,000 FHLB advances represent borrowings by First Mid Bank to fund loan demand. At December 31, 2017 the advances totaling $60 million w ere as follows: • $5 million advance with a 3-year maturity, at 1.30% due May 7, 2018 • $5 million advance with a 2-year maturity, at 0.99% due June 21, 2018 • $10 million advance with a 3-year maturity, at 1.42% , due November 5, 2018 • $5 million advance with a 1.5-year maturity, at 1.49% , due December 28, 2018 • $5 million advance with a 2-year maturity, at 1.56% , due June 28, 2019 • $5 million advance with a 2.5-year maturity, at 1.67% , due January 31, 2020 • $5 million advance with a 3-year maturity, at 1.75% , due July 31, 2020 • $5 million advance with a 6-year maturity, at 2.30% , due August 24, 2020 • $5 million advance with a 3.5-year maturity, at 1.83% , due February 1, 2021 • $5 million advance with a 7-year maturity, at 2.55% , due October 1, 2021 • $5 million advance with a 8-year maturity, at 2.40% , due January 9, 2023 Securities sold under agreements to repurchase were $155.4 million at December 31, 2017 , a decrease of $30 million from $185.8 million at December 31, 2016 . The decrease during 2017 was primarily due to seasonal declines in balances of customers due to changes in cash flow needs for their businesses. Securities sold under agreements to repurchase have overnight maturities and a weighted average rate of .10% . (in thousands) 2017 2016 2015 Securities sold under agreements to repurchase: Maximum outstanding at any month-end $ 163,626 $ 185,763 $ 128,842 Average amount outstanding for the year 144,674 129,734 113,748 The right of setoff for a repurchase agreement resembles a secured borrowing, whereby the collateral pledged by the Company would be used to settle the fair value of the repurchase agreement should the Company be in default (e.g., declare bankruptcy), the Company could cancel the repurchase agreement (i.e., cease payment of principal and interest), and attempt collection on the amount of collateral value in excess of the repurchase agreement fair value. The collateral is held by a third party financial institution in the counterparty's custodial account. The counterparty has the right to sell or repledge the investment securities. For government entity repurchase agreements, the collateral is held by the Company in a segregated custodial account under a tri-party agreement. The Company is required by the counterparty to maintain adequate collateral levels. In the event the collateral fair value falls below stipulated levels, the Company will pledge additional securities. The Company closely monitors collateral levels to ensure adequate levels are maintained, while mitigating the potential of over-collateralization in the event of counterparty default. Repurchase agreements by class of collateral pledged are as follows (in thousands): December 31, 2017 December 31, 2016 US Treasury securities and obligations of U.S. government corporations & agencies $ 100,895 $ 100,526 Obligations of states and political subdivisions — 1,173 Mortgage-backed securities: GSE: residential 54,493 84,064 Total $ 155,388 $ 185,763 At December 31, 2017 , there was a zero outstanding loan balance on the revolving credit agreement with The Northern Trust Company. This loan was renewed on April 14, 2017 for one year as a revolving credit agreement with a maximum available balance of $10 million . The interest rate ( 3.67% and 2.91% at December 31, 2017 and 2016 , respectively) is floating at 2.25% over the federal funds rate. The loan is secured by all of the stock of First Mid Bank. Management believes that the Company and its subsidiary banks were in compliance with all the existing covenants at December 31, 2017 and 2016 . Also on September 7, 2016, the Company entered into a $15 million fixed-rate note with a maturity date of September 7, 2020. The interest rate is floating at 2.25% over the federal funds rate ( 3.67% and 2.91% at December 31, 2017 and 2016 , respectively) and interest and principal payments are due quarterly. As of December 31, 2017 , the balance due was $10.3 million . The loan is secured by all of the stock of First Mid Bank, including requirements for operating and capital ratios. Management believes the Company and its subsidiary bank were in compliance with all the existing covenants at December 31, 2017 and 2016 . On February 27, 2004, the Company completed the issuance and sale of $10 million of floating rate trust preferred securities through Trust I, a statutory business trust and wholly-owned unconsolidated subsidiary of the Company, as part of a pooled offering. The Company established Trust I for the purpose of issuing the trust preferred securities. The $10 million in proceeds from the trust preferred issuance and an additional $310,000 for the Company’s investment in common equity of the Trust, a total of $10,310,000 , was invested in junior subordinated debentures of the Company. The underlying junior subordinated debentures issued by the Company to Trust I mature in 2034, bear interest at three-month London Interbank Offered Rate (“LIBOR”) plus 280 basis points , reset quarterly, and are callable, at the option of the Company, at par on or after April 7, 2009. At December 31, 2017 and 2016 the rate was 4.21% and 3.73% , respectively. The Company used the proceeds of the offering for general corporate purposes. On April 26, 2006, the Company completed the issuance and sale of $10 million of fixed/floating rate trust preferred securities through Trust II, a statutory business trust and wholly-owned unconsolidated subsidiary of the Company, as part of a pooled offering. The Company established Trust II for the purpose of issuing the trust preferred securities. The $10 million in proceeds from the trust preferred issuance and an additional $310,000 for the Company’s investment in common equity of Trust II, a total of $10,310,000 , was invested in junior subordinated debentures of the Company. The underlying junior subordinated debentures issued by the Company to Trust II mature in 2036, bore interest at a fixed rate of 6.98% paid quarterly until June 15, 2011 and then converted to floating rate (LIBOR plus 160 basis points) after June 15, 2011 ( 3.19% and 2.56% at December 31, 2017 and 2016 ). The net proceeds to the Company were used for general corporate purposes, including the Company’s acquisition of Mansfield. On September 8, 2016, the Company assumed the trust preferred securities of Clover Leaf Statutory Trust I (“CLST I”), a statutory business trust that was a wholly owned unconsolidated subsidiary of First Clover Financial. The $4 million of trust preferred securities and an additional $124,000 additional investment in common equity of CLST I, is invested in junior subordinated debentures issued to CLST I. The subordinated debentures mature in 2025, bear interest at three-month LIBOR plus 185 basis points ( 3.44% and 2.81% at December 31, 2017 and 2016 , respectively) and resets quarterly. The trust preferred securities issued by Trust I, Trust II, and CLST I are included as Tier 1 capital of the Company for regulatory capital purposes. On March 1, 2005, the Federal Reserve Board adopted a final rule that allows the continued limited inclusion of trust preferred securities in the calculation of Tier 1 capital for regulatory purposes. The final rule provided a five-year transition period, ending September 30, 2010, for application of the revised quantitative limits. On March 17, 2009, the Federal Reserve Board adopted an additional final rule that delayed the effective date of the new limits on inclusion of trust preferred securities in the calculation of Tier 1 capital until March 31, 2012. The application of the revised quantitative limits did not and is not expected to have a significant impact on its calculation of Tier 1 capital for regulatory purposes or its classification as well-capitalized. The Dodd-Frank Act, signed into law July 21, 2010, removes trust preferred securities as a permitted component of a holding company’s Tier 1 capital after a three-year phase-in period beginning January 1, 2013 for larger holding companies. For holding companies with less than $15 billion in consolidated assets, existing issues of trust preferred securities are grandfathered and not subject to this new restriction. Similarly, the final rule implementing the Basel III reforms allows holding companies with less than $15 billion in consolidated assets as of December 31, 2009 to continue to count toward Tier 1 capital any trust preferred securities issued before May 19, 2010. New issuances of trust preferred securities, however would not count as Tier 1 regulatory capital. In addition to requirements of the Dodd-Frank Act discussed above, the act also required the federal banking agencies to adopt rules that prohibit banks and their affiliates from engaging in proprietary trading and investing in and sponsoring certain unregistered investment companies (defined as hedge funds and private equity funds). This rule is generally referred to as the “Volcker Rule.” On December 10, 2013, the federal banking agencies issued final rules to implement the prohibitions required by the Volcker Rule. Following the publication of the final rule, and in reaction to concerns in the banking industry regarding the adverse impact the final rule’s treatment of certain collateralized debt instruments has on community banks, the federal banking agencies approved an interim final rule to permit banking entities to retain interests in certain collateralized debt obligations backed primarily by trust preferred securities. Under the interim final rule, the agencies permit the retention of an interest in or sponsorship of covered funds by banking entities under $15 billion in assets if (1) the collateralized debt obligation was established and issued prior to May 19, 2010, (2) the banking entity reasonably believes that the offering proceeds received by the collateralized debt obligation were invested primarily in qualifying trust preferred collateral, and (3) the banking entity’s interests in the collateralized debt obligation was acquired on or prior to December 10, 2013. Although the Volcker Rule impacts many large banking entities, the Company does not currently anticipate that the Volcker Rule will have a material effect on the operations of the Company or First Mid Bank.

Regulatory Capital (Notes)

Regulatory Capital (Notes)	12 Months Ended
	Dec. 31, 2017
Regulatory Capital [Abstract]
Regulatory Capital Requirements under Banking Regulations [Text Block]	Regulatory Capital The Company is subject to various regulatory capital requirements administered by the federal banking agencies. Bank holding companies follow minimum regulatory requirements established by the Board of Governors of the Federal Reserve System (“Federal Reserve System”), and First Mid Bank follow similar minimum regulatory requirements established for national banks by the Office of the Comptroller of the Currency (“OCC”). Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary action by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Quantitative measures established by each regulatory capital standards to ensure capital adequacy require the Company and its subsidiary bank to maintain a minimum capital amounts and ratios (set forth in the table below). Management believes that, as of December 31, 2017 and 2016 , the Company and First Mid Bank met all capital adequacy requirements. As of December 31, 2017 and 2016 , the most recent notification from the primary regulators categorized First Mid Bank and FIrst Clover Leaf Bank (prior to its merger into First Mid Bank) as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, minimum total risk-based capital, Tier 1 risk-based capital, Common Equity Tier 1 risk-based capital, and Tier 1 leverage ratios must be maintained as set forth in the table below. At December 31, 2017 , there were no conditions or events since the most recent notification that management believes have changed this categorization. Actual Required Minimum For Capital Adequacy Purposes with Capital Buffer To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount (in thousands) Ratio Amount (in thousands) Ratio Amount (in thousands) Ratio December 31, 2017 Total Capital (to risk-weighted assets) Company $ 290,843 12.70 % $ 211,848 > 9.25% N/A N/A First Mid Bank 282,621 12.39 % 211,064 > 9.25 $ 228,177 > 10.00% Tier 1 Capital (to risk-weighted assets) Company 270,866 11.83 % 166,043 > 7.25 N/A N/A First Mid Bank 262,644 11.51 % 165,428 > 7.25 182,542 > 8.00 Common Equity Tier 1 Capital (to risk-weighted assets) Company 246,866 10.78 % 131,690 > 5.75 N/A N/A First Mid Bank 262,644 11.51 % 131,202 > 5.75 148,315 > 6.50 Tier 1 Capital (to average assets) Company 270,866 9.91 % 109,381 > 4.00 N/A N/A First Mid Bank 262,644 9.63 % 109,113 > 4.00 136,392 > 5.00 December 31, 2016 Total Capital (to risk-weighted assets) Company $ 270,062 12.79 % $ 182,137 > 8.625% N/A N/A First Mid Bank 197,552 12.44 % 137,019 > 8.625 $ 158,817 > 10.00% First Clover Leaf Bank 78,145 15.08 % 44,698 > 8.625 51,824 > 10.00% Tier 1 Capital (to risk-weighted assets) Company 253,258 11.99 % 139,903 > 6.625 N/A N/A First Mid Bank 180,826 11.39 % 105,247 > 6.625 127,090 > 8.00 First Clover Leaf Bank 78,145 15.08 % 34,333 > 6.625 41,459 > 8.00 Common Equity Tier 1 Capital (to risk-weighted assets) Company 229,341 10.86 % 108,226 > 5.125 N/A N/A First Mid Bank 180,826 11.39 % 81,417 > 5.125 103,261 > 6.50 First Clover Leaf Bank 78,145 15.08 % 26,560 > 5.125 33,685 > 6.50 Tier 1 Capital (to average assets) Company 253,258 9.19 % 110,242 > 4.00 N/A N/A First Mid Bank 180,826 8.62 % 83,938 > 4.00 104,922 > 5.00 First Clover Leaf Bank 78,145 12.04 % 25,963 > 4.00 32,453 > 5.00 The Company's risk-weighted assets, capital and capital ratios for December 31, 2017 are computed in accordance with Basel III capital rules which were effective January 1, 2015. Prior periods are computed following previous rules. See heading "Basel III" in the Overview section of this report for a more detailed description of Basel III rules. As of December 31, 2017, the Company and First Mid Bank had capital ratios above the required minimums for regulatory capital adequacy, and First Mid Bank had capital ratios that qualified it for treatment as well-capitalized under the regulatory framework for prompt corrective action with respect to banks. First Clover Leaf Bank merged into First Mid Bank during the first quarter of 2017.

Disclosures of Fair Values of F

Disclosures of Fair Values of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements must maximize the use of observable inputs and minimize the use of unobservable inputs. There is a hierarchy of three levels of inputs that may be used to measure fair value: Level 1 Valuations for assets and liabilities traded in active exchange markets, such as the New York Stock Exchange. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. Level 2 Valuations for assets and liabilities traded in less active dealer or broker markets. Valuations are obtained from third party pricing services for identical or comparable assets or liabilities which use observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in active markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Following is a description of the inputs and valuation methodologies used for assets measured at fair value on a recurring basis and recognized in the accompanying balance sheets, as well as the general classification of such assets pursuant to the valuation hierarchy. Available-for-Sale Securities. The fair value of available-for-sale securities is determined by various valuation methodologies. Where quoted market prices are available in an active market, securities are classified within Level 1. If quoted market prices are not available, then fair values are estimated by using quoted prices of securities with similar characteristics or independent asset pricing services and pricing models, the inputs of which are market-based or independently sources market parameters, including but not limited to, yield curves, interest rates, volatilities, prepayments, defaults, cumulative loss projections and cash flows. Such securities are classified in Level 2 of the valuation hierarchy. In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy and include subordinated tranches of collateralized mortgage obligations and investments in trust preferred securities. Fair value determinations for Level 3 measurements of securities are the responsibility of the Treasury function of the Company. The Company contracts with a pricing specialist to generate fair value estimates on a monthly basis. The Treasury function of the Company challenges the reasonableness of the assumptions used and reviews the methodology to ensure the estimated fair value complies with accounting standards generally accepted in the United States, analyzes the changes in fair value and compares these changes to internally developed expectations and monitors these changes for appropriateness. The trust preferred securities are collateralized debt obligation securities that are backed by trust preferred securities issued by banks, thrifts, and insurance companies. The market for these securities at December 31, 2017 and 2016 is not active and markets for similar securities are also not active. The inactivity was evidenced first by a significant widening of the bid-ask spread in the brokered markets in which trust preferred securities trade and then by a significant decrease in the volume of trades relative to historical levels. The new issue market is also inactive and will continue to be, as a result of the Dodd-Frank Act’s elimination of trust preferred securities from Tier 1 capital for certain holding companies. There are currently very few market participants who are willing and or able to transact for these securities. The market values for these securities are very depressed relative to historical levels. Given conditions in the debt markets today and the absence of observable transactions in the secondary and new issue markets, we determined: • The few observable transactions and market quotations that are available are not reliable for purposes of determining fair value at December 31, 2017 and 2016 , • An income valuation approach technique (present value technique) that maximizes the use of relevant observable inputs and minimizes the use of unobservable inputs will be equally or more representative of fair value than the market approach valuation technique used at prior measurement dates, and • The trust preferred securities held by the Company will be classified within Level 3 of the fair value hierarchy because we determined that significant adjustments are required to determine fair value at the measurement date. The following table presents the Company’s assets that are measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall as of December 31, 2017 and 2016 (in thousands): Fair Value Measurements Using: Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Available-for-sale securities: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 113,770 $ — $ 113,770 $ — Obligations of states and political subdivisions 166,266 — 166,266 — Mortgage-backed securities 293,811 — 293,811 — Trust preferred securities 2,548 — — 2,548 Other securities 2,184 172 2,012 — Total available-for-sale securities $ 578,579 $ 172 $ 575,859 $ 2,548 December 31, 2016 Available-for-sale securities: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 136,324 $ — $ 136,324 $ — Obligations of states and political subdivisions 162,705 — 162,705 — Mortgage-backed securities 314,991 — 314,991 — Trust preferred securities 1,652 — — 1,652 Other securities 4,176 144 4,032 — Total available-for-sale securities $ 619,848 $ 144 $ 618,052 $ 1,652 The change in fair value of assets measured on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2017 and 2016 is summarized as follows (in thousands): Trust Preferred Securities December 31, 2017 December 31, 2016 Beginning balance $ 1,652 $ 1,906 Transfers into Level 3 — — Transfers out of Level 3 — — Total gains or losses Included in net income — — Included in other comprehensive income (loss) 1,053 (174 ) Purchases, issuances, sales and settlements Purchases — — Issuances — — Sales — — Settlements (157 ) (80 ) Ending balance $ 2,548 $ 1,652 Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date $ — $ — Following is a description of the valuation methodologies used for assets measured at fair value on a nonrecurring basis and recognized in the accompanying balance sheets, as well as the general classification of such assets pursuant to the valuation hierarchy. Impaired Loans (Collateral Dependent) Loans for which it is probable that the Company will not collect all principal and interest due according to contractual terms are measured for impairment. Allowable methods for determining the amount of impairment and estimating fair value include using the fair value of the collateral for collateral dependent loans. If the impaired loan is identified as collateral dependent, then the fair value method of measuring the amount of impairment is utilized. This method requires obtaining a current independent appraisal of the collateral and applying a discount factor to the value. Impaired loans that are collateral dependent are classified within Level 3 of the fair value hierarchy when impairment is determined using the fair value method. Management establishes a specific allowance for loans that have an estimated fair value that is below the carrying value. The total carrying amount of loans for which a change in specific allowance has occurred as of December 31, 2017 was $3,665,000 and a fair value of $3,053,000 resulting in specific loss exposures of $612,000 . As of December 31, 2016 , the total carrying amount of loans for which a change specific allowance has occurred was $8,370,000 . These loans had a fair value of $6,938,000 which resulted in specific loss exposures of $1,432,000 . When there is little prospect of collecting principal or interest, loans, or portions of loans, may be charged-off to the allowance for loan losses. Losses are recognized in the period an obligation becomes uncollectible. The recognition of a loss does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practical or desirable to defer writing off the loan even though partial recovery may be affected in the future. Foreclosed Assets Held For Sale Other real estate owned acquired through loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. The adjustment at the time of foreclosure is recorded through the allowance for loan losses. Due to the subjective nature of establishing the fair value when the asset is acquired, the actual fair value of the other real estate owned or foreclosed asset could differ from the original estimate. If it is determined that fair value declines subsequent to foreclosure, a valuation allowance is recorded through noninterest expense. Operating costs associated with the assets after acquisition are also recorded as noninterest expense. Gains and losses on the disposition of other real estate owned and foreclosed assets are netted and posted to other noninterest expense. The total carrying amount of other real estate owned as of December 31, 2017 was $2,754,000 . Other real estate owned included in the total carrying amount and measured at fair value on a nonrecurring basis during the period amounted to $91,000 . The total carrying amount of other real estate owned as of December 31, 2016 was $1,982,000 . Other real estate owned included in the total carrying amount and measured at fair value on a nonrecurring basis during the period amounted to $173,000 . The following table presents the fair value measurement of assets measured at fair value on a nonrecurring basis and the level within the fair value hierarchy in which the fair value measurements fall at December 31, 2017 and 2016 (in thousands): Fair Value Measurements Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Impaired loans (collateral dependent) $ 3,053 $ — $ — $ 3,053 Foreclosed assets held for sale 91 — — 91 December 31, 2016 Impaired loans (collateral dependent) $ 6,938 $ — $ — $ 6,938 Foreclosed assets held for sale 173 — — 173 Sensitivity of Significant Unobservable Inputs The following is a discussion of the sensitivity of significant unobservable inputs, the interrelationships between those inputs and other unobservable inputs used in recurring fair value measurement and of how those inputs might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurement. Trust Preferred Securities. The significant unobservable inputs used in the fair value measurement of the Company’s trust preferred securities are offered quotes and comparability adjustments. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, changes in either of those inputs will not affect the other input. The following table presents quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements other than goodwill at December 31, 2017 . Fair Value (in thousands) Valuation Technique Unobservable Inputs Range (Weighted Average) Trust Preferred Securities $ 2,548 Discounted cash flow Discount rate 12.7 % Constant prepayment rate (1) 1.3 % Cumulative projected prepayments 21.6 % Probability of default 0.5 % Projected cures given deferral 0.0 % Loss severity 97.7 % Impaired loans (collateral dependent) 3,053 Third party valuations Discount to reflect realizable value 0 % - 40% ( 20 % ) Foreclosed assets held for sale 91 Third party valuations Discount to reflect realizable value less estimated selling costs 0 % - 40% ( 35 % ) (1) Every five years The following table presents quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements other than goodwill at December 31, 2016 . Fair Value (in thousands) Valuation Technique Unobservable Inputs Range (Weighted Average) Trust Preferred Securities $ 1,652 Discounted cash flow Discount rate 13.6% Constant prepayment rate (1) 1.3% Cumulative projected prepayments 22.4% Probability of default 0.5% Projected cures given deferral 0.0% Loss severity 97.6% Impaired loans (collateral dependent) 6,938 Third party valuations Discount to reflect realizable value 0% - 40% ( 20% ) Foreclosed assets held for sale $ 173 Third party valuations Discount to reflect realizable value less estimated selling costs 0% - 40% ( 35% ) (1) Every five years Other. The following methods were used to estimate the fair value of all other financial instruments recognized in the accompanying balance sheets at amounts other than fair value. Cash and Cash Equivalents, Federal Funds Sold, Interest Receivable, Federal Reserve and Federal Home Loan Bank Stock The carrying amount approximates fair value. Certificates of Deposit Investments The fair value of certificates of deposit investments is estimated using a discounted cash flow calculation that applies the rates currently offered for deposits of similar remaining maturities. Held-to-Maturity Securities Fair Value is based on quoted market prices, if available. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities. Loans Held for Sale Loans expected to be sold are classified as held for sale and are recorded at the lower of aggregate cost or market value. Loans For loans with floating interest rates, it is assumed that the estimated fair values generally approximate the carrying amount balances. Fixed rate loans have been valued using a discounted present value of projected cash flow. The discount rate used in these calculations is the current rate at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. The carrying amount of accrued interest approximates its fair value. Deposits Deposits include demand deposits, savings accounts, NOW accounts and certain money market deposits. The carrying amount of these deposits approximates fair value. The fair value of fixed-maturity time deposits is estimated using a discounted cash flow calculation that applies the rates currently offered for deposits of similar remaining maturities. Securities Sold Under Agreements to Repurchase The fair value of securities sold under agreements to repurchased is estimated using a discounted cash flow calculation that applies the rates currently offered for deposits of similar remaining maturities. Interest Payable The carrying amount approximates fair value. Junior Subordinated Debentures, Federal Home Loan Bank Borrowings, and Other Borrowings Rates currently available to the Company for debt with similar terms and remaining maturities are used to estimate the fair value of existing debt. The following tables present estimated fair values of the Company’s financial instruments at December 31, 2017 and 2016 in accordance with FAS 107-1 and APB 28-1, codified with ASC 805 (in thousands): Carrying Amount Fair Value Level 1 Level 2 Level 3 December 31, 2017 Financial Assets Cash and due from banks $ 88,388 $ 88,388 $ 88,388 $ — $ — Federal funds sold 491 491 491 — — Certificates of deposit investments 1,685 1,692 — 1,692 — Available-for-sale securities 578,579 578,579 172 575,859 2,548 Held-to-maturity securities 69,332 68,457 — 68,457 — Loans held for sale 1,025 1,025 — 1,025 — Loans net of allowance for loan losses 1,918,499 1,899,678 — — 1,899,678 Interest receivable 10,832 10,832 — 10,832 — Federal Reserve Bank stock 5,160 5,160 — 5,160 — Federal Home Loan Bank stock 2,407 2,407 — 2,407 — Financial Liabilities Deposits 2,274,639 2,272,868 — 1,930,604 342,264 Securities sold under agreements to repurchase 155,388 155,394 — 155,394 — Interest payable 602 602 — 602 — Federal Home Loan Bank borrowings 60,038 59,968 — 59,968 — Other borrowings 10,313 10,313 — 10,313 — Junior subordinated debentures 24,000 18,050 — 18,050 — December 31, 2016 Financial Assets Cash and due from banks $ 137,002 $ 137,002 $ 137,002 $ — $ — Federal funds sold 38,900 38,900 38,900 — — Certificates of deposit investments 14,643 14,651 — 14,651 — Available-for-sale securities 619,848 619,848 144 618,052 1,652 Held-to-maturity securities 74,231 73,096 — 73,096 — Loans held for sale 1,175 1,175 — 1,175 — Loans net of allowance for loan losses 1,808,064 1,795,764 — — 1,795,764 Interest receivable 10,553 10,553 — 10,553 — Federal Reserve Bank stock 3,949 3,949 — 3,949 — Federal Home Loan Bank stock 4,389 4,389 — 4,389 — Financial Liabilities Deposits 2,329,887 2,331,725 — 1,976,806 354,919 Securities sold under agreements to repurchase 185,763 185,766 — 185,766 — Interest payable 535 535 — 535 — Federal Home Loan Bank borrowings 40,094 40,318 — 40,318 — Other borrowings 18,063 18,063 — 18,063 — Junior subordinated debentures 23,917 17,068 — 17,068 —

Deferred Compensation Plan (Not

Deferred Compensation Plan (Notes)	12 Months Ended
	Dec. 31, 2017
Deferred Compensation Plan [Abstract]
Deferred Compensation Plan	Deferred Compensation Plan The Company follows the provisions of ASC 710, for purposes of the First Mid-Illinois Bancshares, Inc. Deferred Compensation Plan (“DCP”). At December 31, 2017 , the Company classified the cost basis of its common stock issued and held in trust in connection with the DCP of approximately $3,540,000 as treasury stock. The Company also classified the cost basis of its related deferred compensation obligation of approximately $3,540,000 as an equity instrument (deferred compensation). The DCP was effective as of June 1984. The purpose of the DCP is to enable directors, advisory directors, and key employees the opportunity to defer a portion of the fees and cash compensation paid by the Company as a means of maximizing the effectiveness and flexibility of compensation arrangements. The Company invests all participants’ deferrals in shares of common stock. Dividends paid on the shares are credited to participants’ DCP accounts and invested in additional shares. During 2017 and 2016 the Company issued 6,875 common shares and 4,683 common shares, respectively, pursuant to the DCP.

Stock Incentive Plan (Notes)

Stock Incentive Plan (Notes)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plan	Stock Incentive Plan At the Annual Meeting of Stockholders held April 26, 2017, the stockholders approved the 2017 Stock Incentive Plan ("SI Plan"). The SI Plan was implemented to succeed the Company's 2007 Stock Incentive Plan, which had a ten-year term. The SI Plan is intended to provide a means whereby directors, employees, consultants and advisors of the Company and its Subsidiaries may sustain a sense of proprietorship and personal involvement in the continued development and financial success of the Company and its Subsidiaries, thereby advancing the interests of the Company and its stockholders. Accordingly, directors and selected employees, consultants and advisors may be provided the opportunity to acquire shares of Common Stock of the Company on the terms and conditions established in the SI Plan. A maximum of 149,983 shares are authorized under the SI Plan. Prior to December 31, 2008, the Company had awarded 59,500 shares as stock options under the 2007 SI Plan. There have been no options awarded since 2008. The Company awarded 18,391 , 13,912 and 18,002 shares during 2017, 2016, 2015, respectively as stock and stock unit awards. The fair value of options granted was estimated on the grant date using the Black-Scholes option-pricing model. Expected volatility was based on historical volatility of the Company’s stock and other factors. The Company used historical data to estimate option exercises and employee termination within the valuation model; separate groups of employees who had similar historical exercise behavior were considered separately for valuation purposes. The expected term of options granted was derived from the output of the option valuation model and represented the period of time that options granted were expected to be outstanding. The risk-free rate for periods within the contractual life of the option was based on the U.S. Treasury yield curve in effect at the time of the grant. There were no options granted during 2017 , 2016 or 2015 . The following table summarizes the compensation cost, net of forfeitures, related to stock-based compensation for the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Stock and stock unit awards: Pre-tax compensation expense $ 954 $ 384 $ 378 Income tax benefit (334 ) (134 ) (132 ) Total share-based compensation expense, net of income taxes $ 620 $ 250 $ 246 A summary of option activity under the SI Plan and the 1997 Stock Incentive Plan as of December 31, 2017, 2016 and 2015 , and changes during the years then ended is presented below: 2017 Shares Weighted-Average Weighted-Average Aggregate Outstanding, beginning of year 40,500 $24.65 Granted 0 0.00 Exercised (27,500) 25.42 Forfeited or expired (2,500) 23.00 Outstanding, end of year 10,500 $23.00 0.96 $ 163,170 Exercisable, end of year 10,500 $23.00 0.96 $ 163,170 The total intrinsic value of options exercised during 2017 was $259,000 . There were no stock options for shares of common stock not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2017 because they were anti-dilutive. 2016 Shares Weighted-Average Weighted-Average Aggregate Outstanding, beginning of year 45,500 $24.67 Granted 0 0.00 Exercised (2,500) 24.86 Forfeited or expired (2,500) 24.86 Outstanding, end of year 40,500 $24.65 1.42 $ 378,850 Exercisable, end of year 40,500 $24.65 1.42 $ 378,850 The total intrinsic value of options exercised during 2016 was $14,000 . There were no stock options for shares of common stock not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2016 because they were anti-dilutive. 2015 Shares Weighted-Average Weighted-Average Aggregate Outstanding, beginning of year 52,000 $24.64 Granted 0 0.00 Exercised 0 0.00 Forfeited or expired (6,500) 24.43 Outstanding, end of year 45,500 $24.67 2.42 $ 63,000 Exercisable, end of year 45,500 $24.67 2.42 $ 63,000 There were no options exercised during 2015. Stock options for 24,500 shares of common stock were not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2015 because they were anti-dilutive. The following table summarizes information about stock options under the SI Plan outstanding at December 31, 2017 : Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted-Average Remaining Contractual Life Weighted-Average Exercise Price Number Exercisable Weighted-Average Exercise Price $22.50 to $24.50 10,500 0.96 $23.00 10,500 $23.00 During 2017, the Board changed its award process and subsequently approved the acceleration of the vesting of all remaining outstanding restricted stock units. This resulted in total compensation expense for the year ended December 31, 2017 of approximately, $954,000 . During 2015, the Board approved a revision to the LTIP, whereby all awards granted to participants were stock unit awards, cumulative with a three-year performance period and to be settled entirely in shares. All other provisions of the plan remained the same. The following table summarizes non-vested stock and stock unit activity for the years ended December 31, 2017, 2016 and 2015 : 2017 2016 2015 Shares Weighted-avg Grant-date Fair Value Shares Weighted-avg Grant-date Fair Value Shares Weighted-avg Grant-date Fair Value Nonvested, beginning of year 32,338 $22.64 30,169 $20.87 26,897 $22.95 Granted 18,391 30.65 13,912 26.09 18,002 20.14 Vested (50,729) 25.54 (11,743) 22.18 (14,730) 23.77 Forfeited 0 0.00 0 0.00 0 0.00 Nonvested, end of year 0 $0.00 32,338 $22.64 30,169 $20.87 Fair value of shares vested $ 260,483 $ 260,483 $ 350,075 The fair value of the awards is amortized to compensation expense over the vesting periods of the awards (four years for annual awards and three years for cumulative awards) and is based on the market price of the Company’s common stock at the date of grant multiplied by the number of shares granted that are expected to vest. As of December 31, 2017, 2016 and 2015 , there was $0 , $344,000 , and $386,000 , respectively, of total unrecognized compensation cost related to unvested stock and stock unit awards under the SI Plan.

Retirement Plans (Notes)

Retirement Plans (Notes)	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	Retirement Plans The Company has a defined contribution retirement plan which covers substantially all employees and which provides for a Company contribution equal to 4% of each participant’s compensation and a Company matching contribution of up to 100% of the first 3% and 50% of the next 2% of pre tax contributions made by each participant. Employee contributions are limited to the 402(g) limit of compensation. The total expense for the plan amounted to $1,630,000 , $1,383,000 and $1,080,000 in 2017 , 2016 and 2015 , respectively. The Company also has two agreements in place to pay $50,000 annually for 20 years from the retirement date to the surviving spouse of a deceased former senior officer of the Company and to a senior officer that retired December 31, 2013. Total expense under these two agreements amounted to $40,000 , $43,000 and $29,000 in 2017 , 2016 and 2015 , respectively. The current liability recorded for these two agreements was $597,000 and $658,000 , as of December 31, 2017 and 2016 , respectively.

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of federal and state income tax expense for the years ended December 31, 2017, 2016 and 2015 were as follows (in thousands): 2017 2016 2015 Current Federal $ 9,825 $ 11,375 $ 7,357 State 2,719 2,953 1,841 Total Current 12,544 14,328 9,198 Deferred Federal 2,047 (1,940 ) (84 ) State 451 (448 ) 104 Total Deferred 2,498 (2,388 ) 20 Total $ 15,042 $ 11,940 $ 9,218 Recorded income tax expense differs from the expected tax expense (computed by applying the applicable statutory U.S. federal tax rate of 35% to income before income taxes). During 2017 , 2016 and 2015 , the Company was in a graduated tax rate position. The principal reasons for the difference are as follows (in thousands): 2017 2016 2015 Expected income taxes $ 14,604 $ 11,823 $ 9,006 Effects of: Tax-exempt income from bank owned life insurance (573 ) (235 ) — Other tax exempt income (2,223 ) (1,577 ) (1,103 ) Nondeductible interest expense 28 21 11 State taxes, net of federal taxes 2,062 1,628 1,264 Other items (266 ) 280 41 Adjustment of deferred tax assets and liabilities for enacted change in tax laws 1,410 — — Effect of marginal tax rate — — (1 ) Total $ 15,042 $ 11,940 $ 9,218 On December 22, 2017, the United States enacted certain tax reforms through the Tax Cuts and Jobs Act , which changes existing tax laws, most significantly a change in the statutory corporate tax rate from 35% to 21% . As a result of this enactment, the Company incurred additional one-time income tax expense of approximately $1.4 million during the fourth quarter of 2017, primarily due to remeasurement of deferred tax assets and liabilities. Tax expense recorded by the Company during 2017 , 2016 and 2015 did not include any interest or penalties. Tax returns filed with the Internal Revenue Service and Illinois Department of Revenue are subject to review by law under a three-year statute of limitations. The Company is no longer subject to U.S. federal or state income tax examinations by tax authorities for years before 2014 . The tax effects of the temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2017 and 2016 are presented below (in thousands): 2017 2016 Deferred tax assets: Allowance for loan losses $ 5,694 $ 6,599 Available-for-sale investment securities 941 3,680 Deferred compensation 749 1,030 Supplemental retirement 170 259 Core deposit premium and other intangible assets 664 691 Pass thru activities 126 — Other-than-temporary impairment on securities 317 438 Stock Compensation Expense — 194 Deferred Revenue — 101 Purchase Accounting 475 1,791 Acquisition Costs 210 319 Other 596 966 Total gross deferred tax assets 9,942 16,068 Deferred tax liabilities: Deferred loan costs 26 178 Intangibles amortization 3,685 4,467 Prepaid expenses 232 383 FHLB stock dividend 158 380 Depreciation 1,207 740 Deferred Revenue 58 — Accumulated accretion 112 72 Mortgage servicing rights 240 387 Total gross deferred tax liabilities 5,718 6,607 Net deferred tax assets $ 4,224 $ 9,461 Net deferred tax assets are recorded in other assets on the consolidated balance sheets. No valuation allowance related to deferred tax assets was recorded at December 31, 2017 and 2016 as management believes it is more likely than not that the deferred tax assets will be fully realized.

Dividend Restrictions (Notes)

Dividend Restrictions (Notes)	12 Months Ended
	Dec. 31, 2017
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments [Abstract]
Dividend Restrictions	Dividend Restrictions The National Bank Act imposes limitations on the amount of dividends that may be paid by a national bank, such as First Mid Bank. Generally, a national bank may pay dividends out of its undivided profits, in such amounts and at such times as the bank’s board of directors deems prudent. Without prior OCC approval, however, a national bank may not pay dividends in any calendar year which, in the aggregate, exceed the bank’s year-to-date net income plus the bank’s adjusted retained net income for the two preceding years. Factors that could adversely affect First Mid Bank’s net income include other-than-temporary impairment on investment securities that result in credit losses and economic conditions in industries where there are concentrations of loans outstanding that result in impairment of these loans and, consequently loan charges and the need for increased allowances for losses. See “Item 1A. Risk Factors,” Note 4 – “Investment Securities” and Note 5 – “Loans” for a more detailed discussion of the factors. The payment of dividends by any financial institution or its holding company is affected by the requirement to maintain adequate capital pursuant to applicable capital adequacy guidelines and regulations, and a financial institution generally is prohibited from paying any dividends if, following payment thereof, the institution would be undercapitalized. As described above, First Mid Bank exceeded their minimum capital requirements under applicable guidelines as of December 31, 2017 . As of December 31, 2017 , approximately $23.9 million was available to be paid as dividends to the Company by First Mid Bank. Notwithstanding the availability of funds for dividends, however, the OCC may prohibit the payment of any dividends by First Mid Bank if the OCC determines that such payment would constitute an unsafe or unsound practice.

Commitments and Contingent Liab

Commitments and Contingent Liabilities (Notes)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities First Mid Bank enters into financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include lines of credit, letters of credit and other commitments to extend credit. Each of these instruments involves, to varying degrees, elements of credit, interest rate and liquidity risk in excess of the amounts recognized in the consolidated balance sheets. The Company uses the same credit policies and requires similar collateral in approving lines of credit and commitments and issuing letters of credit as it does in making loans. The exposure to credit losses on financial instruments is represented by the contractual amount of these instruments. However, the Company does not anticipate any losses from these instruments. The off-balance sheet financial instruments whose contract amounts represent credit risk at December 31, 2017 and 2016 were as follows (in thousands): 2017 2016 Unused commitments and lines of credit: Commercial real estate $ 73,268 $ 128,576 Commercial operating 223,960 236,182 Home equity 38,318 40,896 Other 69,333 70,092 Total $ 404,879 $ 475,746 Standby letters of credit $ 10,626 $ 9,339 Commitments to originate credit represent approved commercial, residential real estate and home equity loans that generally are expected to be funded within ninety days . Lines of credit are agreements by which the Company agrees to provide a borrowing accommodation up to a stated amount as long as there is no violation of any condition established in the loan agreement. Both commitments to originate credit and lines of credit generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the lines and some commitments are expected to expire without being drawn upon, the total amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued by the Company to guarantee the financial performance of customers to third parties. Standby letters of credit are primarily issued to facilitate trade or support borrowing arrangements and generally expire in one year or less . The credit risk involved in issuing letters of credit is essentially the same as that involved in extending credit facilities to customers. The maximum amount of credit that would be extended under letters of credit is equal to the total off-balance sheet contract amount of such instrument at December 31, 2017 and 2016 . The Company's deferred revenue under standby letters of credit was nominal. The Company is also subject to claims and lawsuits that arise primarily in the ordinary course of business. It is the opinion of management that the disposition of ultimate resolution of such claims and lawsuits will not have a material adverse effect on the consolidated financial position, results of operations and cash flows of the Company.

Related Party Transactions (Not

Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Certain officers, directors and principal stockholders of the Company and its subsidiaries, their immediate families or their affiliated companies (“related parties”) have loans with one or more of the subsidiaries. These loans are made in the ordinary course of business on substantially the same terms, including interest and collateral, as those prevailing for comparable transactions with others. Loans to related parties totaled approximately $76,835,000 and $54,502,000 at December 31, 2017 and 2016 , respectively. Activity during 2017 and 2016 was as follows (in thousands): 2017 2016 Beginning balance $ 54,502 $ 56,045 New loans 29,725 5,450 Loan repayments (7,392 ) (6,993 ) Ending balance $ 76,835 $ 54,502 Deposits from related parties held by First Mid Bank at December 31, 2017 and 2016 totaled $110,324,000 and $156,709,000 , respectively.

Business Combinations (Notes)

Business Combinations (Notes)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Business Combinations First Clover Leaf Financial Corp. On April 26, 2016, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with First Clover Leaf Financial Corp., a Maryland corporation ("First Clover Leaf"), pursuant to which, amongst other things, the Company agreed to acquire 100% of the issued and outstanding shares of First Clover Leaf pursuant to a business combination whereby First Clover Leaf would merge with and into the Company, with the Company as the surviving entity (the "Merger"). At the effective time of the Merger, 25% of the shares of First Clover Leaf common stock issued and outstanding immediately prior to the effective time of the Merger converted into the right to receive $12.87 per share, for an approximate aggregate total of $22,545,000 in cash, and 75% of the shares of First Clover Leaf common stock issued and outstanding immediately prior to the effective time of the Merger converted into the right to receive 0.495 shares of the Company’s common stock, par value $4.00 per share, for an approximate aggregate total of 2,600,616 shares of the Company’s common stock. Cash in lieu of fractional shares of Company common stock were issued in connection with the Merger. First Clover Leaf had $659 million in assets at book value including $449 million in loans and $535 million in deposits. As a result of the acquisition, the Company will have an opportunity to increase its deposit base and reduce transaction costs. The Company also expects to reduce costs through economies of scale. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805, “ Business Combinations ("ASC 805"), ” and accordingly the assets and liabilities were recorded at their estimated fair values on the date of acquisition. Fair values are subject to refinement for up to one year after the closing date of September 8, 2016 as additional information regarding the closing date fair values become available. The total consideration paid was used to determine the amount of goodwill resulting from the transaction. As the total consideration paid exceeded the net assets acquired, goodwill of $19.1 million was recorded for the acquisition. Goodwill recorded in the transaction, which reflects the synergies and economies of scale expected from combining operations and the enhanced revenue opportunities from the Company’s service capabilities in the St. Louis market, is not tax deductible, and was all assigned to the banking segment of the Company. The following table summarizes the estimated fair values of assets acquired and liabilities assumed at the date of the First Clover Leaf acquisition (in thousands). Acquired Book Value Fair Value Adjustments As Recorded by First Mid Bank Assets Cash and due from banks 59,320 — 59,320 Investment Securities 109,911 (737 ) 109,174 Loans 448,668 (10,403 ) 438,265 Allowance for loan losses (6,928 ) 6,928 — Other real estate owned 2,741 (754 ) 1,987 Premises and equipment 9,618 1,963 11,581 Goodwill 11,385 7,758 19,143 Core deposit intangible 99 4,561 4,660 Other assets 23,974 2,875 26,849 Total assets acquired $ 658,788 $ 12,191 $ 670,979 Liabilities and Stockholders' Equity Deposits 534,692 1,994 536,686 Securities sold under agreements to repurchase 23,263 — 23,263 FHLB advances 15,000 113 15,113 Subordinated debentures 4,000 (731 ) 3,269 Other liabilities 2,103 2,074 4,177 Total liabilities assumed 579,058 3,450 582,508 Net Assets Acquired $ 79,730 $ 8,741 $ 88,471 Consideration Paid Cash 22,545 Common Stock 65,926 Total Consideration Paid $ 88,471 The Company has recognized approximately $3,308,000 , pre-tax, of acquisition costs for the First Clover Leaf acquisition of which $1,967,000 was recorded for 2017. These costs are included in legal and professional and other expense. Of the $10.4 million difference between the fair value and acquired value of the purchased loans, approximately $ 8.4 million is being accreted to interest income over the remaining term of the loans. The differences between fair value and acquired value of the assumed time deposits of $1.99 million , of the assumed FHLB advances of $113,000 and of the assumed subordinated debentures of $(731,000) , are being amortized to interest expense over the remaining life of the liabilities. The core deposit intangible asset, with a fair value of $ 4.7 million , is being amortized on an accelerated basis over its estimated life of ten years. The following unaudited pro forma condensed combined financial information presents the results of operations of the Company, including the effects of the purchase accounting adjustments and acquisition expenses, had the First Clover Leaf acquisition taken place at the beginning of the period (in thousands, except share data): Twelve months ended December 31, 2016 2015 Net interest income 85,004 76,619 Provision for loan losses 3,556 1,548 Non-interest income 29,118 23,217 Non-interest expense 73,997 66,864 Income before income taxes 36,569 31,424 Income tax expense 12,910 10,671 Net income 23,659 20,753 Dividends on preferred shares 825 1,650 Net income available to common stockholders $ 22,834 $ 19,103 Earnings per share Basic $2.25 $2.39 Diluted $2.22 $2.22 Basic weighted average shares outstanding 10,149,099 7,985,089 Diluted weighted average shares outstanding 10,663,710 9,347,288 The unaudited pro forma condensed combined financial statements do not reflect any anticipated cost savings and revenue enhancements. Accordingly, the pro forma results of operations of the Company as of and after the First Clover Leaf business combination may not be indicative of the results that actually would have occurred if the combination had been in effect during the periods presented or of the results that may be attained in the future. Old National Bank Branches On August 14, 2015, First Mid-Illinois Bank completed the acquisition of twelve Illinois bank branches from Old National Bank, a national banking association having its principal office in Evansville, Indiana. The acquisition expanded First Mid Bank's service area into Southern Illinois and provided a stable source of core deposits. Pursuant to the terms of the Branch Purchase and Assumption Agreement, dated January 30, 2015, as amended, by and between First Mid Bank and Old National Bank, First Mid Bank, among other matters, assumed certain deposit liabilities and acquired certain loans, as well as cash, real property, furniture, and other fixed operating assets associated with the ONB Branches. The deposit and loan balances assumed were approximately $453 million and $156 million at book value, respectively. First Mid Bank also assumed certain leases, and entered into certain subleases, related to the ONB Branches. First Mid Bank agreed to pay Old National Bank the sum of: (i) a deposit premium of 3.6% on the amount of deposit accounts of the ONB Branches, other than brokered deposits and municipal deposits, which equated to approximately $15.9 million , (ii) $500,000 , representing the fixed deposit premium related to the municipal deposits of the ONB Branches, (iii) the principal amount of the loans being purchased, plus the accrued but unpaid interest, (iv) the aggregate net book value of the other assets purchased including facilities of approximately $4.5 million , and (v) the aggregate amount of cash on hand of $2.7 million as of the closing. The acquisition was settled by Old National Bank paying cash of approximately $276.8 million to First Mid Bank for the difference between these amounts and the total deposits assumed. The purchase was accounted for under the acquisition method in accordance with Accounting Standards Codification (“ASC”) 805, “Business Combinations,” and accordingly the assets and liabilities were recorded at their fair values on the date of acquisition. The following table summarizes the estimated fair values of assets acquired and liabilities assumed at the date of acquisition (in thousands). Acquired Book Value Fair Value Adjustments As Recorded by First Mid Bank Assets Cash 279,468 — 279,468 Loans 155,774 (3,377 ) 152,397 Premises and equipment 4,547 (125 ) 4,422 Goodwill — 14,274 14,274 Core deposit intangible — 6,216 6,216 Other assets 1,433 (259 ) 1,174 Total assets acquired $ 441,222 $ 16,729 457,951 Liabilities Deposits 452,810 837 453,647 Securities sold under agreements to repurchase 3,797 — 3,797 Other liabilities 507 — 507 Total liabilities assumed 457,114 837 457,951 The Company recognized approximately $1.4 million of costs related to completion of the acquisition during 2015. These acquisition costs are included in legal and professional and other expense. The difference between the fair value and acquired value of the purchased loans of $3,377,000 is being accreted to interest income over the remaining term of the loans. The difference between the fair value and acquired value of the assumed time deposits of $837,000 is being amortized to interest expense over the remaining term of the time deposits. The core deposit intangible asset, with a fair value of $6,216,000 , is being amortized on an accelerated basis over its estimated life of ten years . The following unaudited pro forma condensed combined financial information presents the results of operations of the Company, including the effects of the purchase accounting adjustments and acquisition expenses, had the acquisition taken place at the beginning of the period (in thousands): Twelve months ended December 31, 2015 Net interest income 66,680 Provision for loan losses 1,483 Non-interest income 26,001 Non-interest expense 59,944 Income before income taxes 31,254 Income tax expense 11,207 Net income 20,047 Dividends on preferred shares 2,200 Net income available to common stockholders $ 17,847 Earnings per share Basic $2.30 Diluted $2.19 Basic weighted average shares outstanding 7,775,490 Diluted weighted average shares outstanding 9,137,689 The unaudited pro forma condensed combined financial statements do not reflect any anticipated cost savings and revenue enhancements. Accordingly, the pro forma results of operations of the Company as of and after the business combination may not be indicative of the results that actually would have occurred if the combination had been in effect during the periods presented or of the results that may be attained in the future.

Leases (Notes)

Leases (Notes)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Leases	Leases The Company has several noncancellable operating leases, primarily for property rental of banking buildings. These leases are for terms from one year to fifteen years and generally contain renewal options for periods ranging from one year to five years . Rental expense for these leases was $2,720,000 , $2,620,000 and $1,749,000 for the years ended December 31, 2017, 2016 and 2015 , respectively. Future minimum lease payments under operating leases are (in thousands): Operating Leases 2018 $ 2,591 2019 2,099 2020 2,099 2021 1,792 2022 1,793 Thereafter 32,882 Total minimum lease payments $ 43,256

Parent Company Only Financial S

Parent Company Only Financial Statements (Notes)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Statements	Parent Company Only Financial Statements Presented below are condensed balance sheets, statements of income and cash flows for the Company (in thousands): First Mid-Illinois Bancshares, Inc. (Parent Company) Balance Sheets December 31, 2017 2016 Assets Cash $ 8,296 $ 2,382 Premises and equipment, net 2,654 2,648 Investment in subsidiaries 328,830 315,752 Other assets 3,555 2,982 Total Assets $ 343,335 $ 323,764 Liabilities and Stockholders’ equity Liabilities Debt 34,313 41,979 Other liabilities 1,058 1,112 Total Liabilities 35,371 43,091 Stockholders’ equity 307,964 280,673 Total Liabilities and Stockholders’ equity $ 343,335 $ 323,764 First Mid-Illinois Bancshares, Inc. (Parent Company) Statements of Income and Comprehensive Income Years ended December 31, 2017 2016 2015 Income: Dividends from subsidiaries $ 18,925 $ 19,475 $ 6,094 Other income 1,227 66 66 Total income 20,152 19,541 6,160 Operating expenses 3,902 3,491 2,556 Income before income taxes and equity in undistributed earnings of subsidiaries 16,250 16,050 3,604 Income tax benefit 864 1,073 974 Income before equity in undistributed earnings of subsidiaries 17,114 17,123 4,578 Equity in undistributed earnings of subsidiaries 9,570 4,717 11,934 Net income 26,684 21,840 16,512 Other comprehensive income (loss), net of taxes 3,525 (6,484 ) 1,598 Comprehensive income $ 30,209 $ 15,356 $ 18,110 First Mid-Illinois Bancshares, Inc. (Parent Company) Statements of Cash Flows Years ended December 31, 2017 2016 2015 Cash flows from operating activities: Net income $ 26,684 $ 21,840 $ 16,512 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, amortization, accretion, net 82 87 87 Dividends received from subsidiary 18,925 19,475 6,094 Equity in undistributed earnings of subsidiaries (9,570 ) (4,717 ) (11,934 ) Increase in other assets (19,348 ) (111,379 ) (4,707 ) Increase in other liabilities 733 153 37 Net cash provided by (used in) operating activities 17,506 (74,541 ) 6,089 Cash flows from investing activities: Investment in subsidiary — (5,000 ) (27,825 ) Net cash from business acquisition — 68,798 — Net cash provided by (used in) investing activities — 63,798 (27,825 ) Cash flows from financing activities: Repayment of short-term debt (4,000 ) (3,000 ) — Proceeds from short-term debt — 7,000 — Repayment of long-term debt (3,750 ) (938 ) — Proceeds from long-term debt — 15,000 — Proceeds from issuance of common stock 4,399 195 28,222 Direct expense related to capital transactions (216 ) (229 ) — Purchase of treasury stock (797 ) — (1,066 ) Dividends paid on preferred stock — (1,286 ) (2,002 ) Dividends paid on common stock (7,228 ) (5,277 ) (3,487 ) Net cash provided by (used in) financing activities (11,592 ) 11,465 21,667 Increase (decrease) in cash 5,914 722 (69 ) Cash at beginning of year 2,382 1,660 1,729 Cash at end of year $ 8,296 $ 2,382 $ 1,660

Quarterly Financial Data -- Una

Quarterly Financial Data -- Unaudited (Notes)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Quarterly Financial Data - Unaudited	Quarterly Financial Data - Unaudited The following table presents summarized quarterly data for each of the two years ended December 31, 2017 and 2016 (in thousands): Quarters ended in 2017 March 31 June 30 September 30 December 31 Selected operations data: Interest income $ 24,182 $ 25,446 $ 24,614 $ 25,313 Interest expense 1,410 1,493 1,741 1,838 Net interest income 22,772 23,953 22,873 23,475 Provision for loan losses 1,722 1,840 1,489 2,411 Net interest income after provision for loan losses 21,050 22,113 21,384 21,064 Other income 7,496 7,969 7,661 7,210 Other expense 19,202 17,955 17,912 19,152 Income before income taxes 9,344 12,127 11,133 9,122 Income taxes 3,080 3,927 3,538 4,497 Net income available to common stockholders $ 6,264 $ 8,200 $ 7,595 $ 4,625 Basic earnings per common share $0.50 $0.66 $0.61 $0.37 Diluted earnings per common share 0.50 0.66 0.61 0.37 Quarters ended in 2016 March 31 June 30 September 30 December 31 Selected operations data: Interest income $ 16,979 $ 16,883 $ 18,623 $ 23,011 Interest expense 892 913 1,000 1,487 Net interest income 16,087 15,970 17,623 21,524 Provision for loan losses 113 733 1,081 899 Net interest income after provision for loan losses 15,974 15,237 16,542 20,625 Other income 6,644 6,459 6,898 6,911 Other expense 15,171 14,143 15,320 16,876 Income before income taxes 7,447 7,553 8,120 10,660 Income taxes 2,641 2,624 2,812 3,863 Net income 4,806 4,929 5,308 6,797 Dividends on preferred shares 550 275 — — Net income available to common stockholders $ 4,256 $ 4,654 $ 5,308 $ 6,797 Basic earnings per common share $ 0.50 $ 0.51 $ 0.51 $ 0.55 Diluted earnings per common share 0.49 0.50 0.51 0.55

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting and Consolidation	Basis of Accounting and Consolidation The accompanying consolidated financial statements include the accounts of First Mid-Illinois Bancshares, Inc. (“Company”) and its wholly-owned subsidiaries: Mid-Illinois Data Services, Inc. (“MIDS”), First Mid-Illinois Bank & Trust, N.A. (“First Mid Bank”), and The Checkley Agency, Inc. doing business as First Mid Insurance Group (“First Mid Insurance”). All significant intercompany balances and transactions have been eliminated in consolidation. Certain amounts in the prior year’s consolidated financial statements have been reclassified to conform to the 2017 presentation and there was no impact on net income or stockholders’ equity from these reclassifications. The Company operates as a single segment entity for financial reporting purposes. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America. Following is a description of the more significant of these policies.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The Company uses estimates and employs the judgments of management in determining the amount of its allowance for loan losses and income tax accruals and deferrals, in its fair value measurements of investment securities, and in the evaluation of impairment of loans, goodwill, investment securities, and fixed assets. As with any estimate, actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses. In connection with the determination of the allowance for loan losses, management obtains independent appraisals for significant properties.
Fair Value Measurements	Fair Value Measurements The fair value of a financial instrument is defined as the amount at which the instrument could be exchanged in a current transaction between willing parties, other than in a forced or liquidation sale. The Company estimates the fair value of a financial instrument using a variety of valuation methods. Where financial instruments are actively traded and have quoted market prices, quoted market prices are used for fair value. When the financial instruments are not actively traded, other observable market inputs, such as quoted prices of securities with similar characteristics, may be used, if available, to determine fair value. When observable market prices do not exist, the Company estimates fair value. The Company’s valuation methods consider factors such as liquidity and concentration concerns. Other factors such as model assumptions, market dislocations, and unexpected correlations can affect estimates of fair value. Imprecision in estimating these factors can impact the amount of revenue or loss recorded. At the end of each quarter, the Company assesses the valuation hierarchy for each asset or liability measured. From time to time, assets or liabilities may be transferred within hierarchy levels due to changes in availability of observable market inputs to measure fair value at the measurement date. Transfers into or out of hierarchy levels are based upon the fair value at the beginning of the reporting period. A more detailed description of the fair values measured at each level of the fair value hierarchy can be found in Note 11 – “Disclosures of Fair Values of Financial Instruments.”
Cash and Cash Equivalents and Certificates of Deposit Investments	Cash and Cash Equivalents For purposes of reporting cash flows, cash equivalents include non-interest bearing and interest bearing cash and due from banks and federal funds sold. Generally, federal funds are sold for one-day periods. Certificates of Deposit Investments Certificates of deposit investments have original maturities of three to five years and are carried at cost.
Investment Securities	Investment Securities The Company classifies its investments in debt and equity securities as either held-to-maturity or available-for-sale in accordance with Statement of Financial Accounting Standards (SFAS) No. 115, “Accounting for Certain Investments in Debt and Equity Securities,” which was codified into ASC 320. Securities classified as held-to-maturity are recorded at cost or amortized cost. Available-for-sale securities are carried at fair value. Fair value calculations are based on quoted market prices when such prices are available. If quoted market prices are not available, estimates of fair value are computed using a variety of techniques, including extrapolation from the quoted prices of similar instruments or recent trades for thinly traded securities, fundamental analysis, or through obtaining purchase quotes. Due to the subjective nature of the valuation process, it is possible that the actual fair values of these investments could differ from the estimated amounts, thereby affecting the financial position, results of operations and cash flows of the Company. If the estimated value of investments is less than the cost or amortized cost, the Company evaluates whether an event or change in circumstances has occurred that may have a significant adverse effect on the fair value of the investment. If such an event or change has occurred and the Company determines that the impairment is other-than-temporary, a further determination is made as to the portion of impairment that is related to credit loss. The impairment of the investment that is related to the credit loss is expensed in the period in which the event or change occurred. The remainder of the impairment is recorded in other comprehensive income.
Loans	Loans Loans are stated at the principal amount outstanding net of unearned discounts, unearned income and the allowance for loan losses. Unearned income includes deferred loan origination fees reduced by loan origination costs and is amortized to interest income over the life of the related loan using methods that approximate the effective interest rate method. Interest on substantially all loans is credited to income based on the principal amount outstanding. The Company’s policy is to discontinue the accrual of interest income on any loan that becomes ninety days past due as to principal or interest or earlier when, in the opinion of management there is reasonable doubt as to the timely collection of principal or interest. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collectability of interest or principal. Loans expected to be sold are classified as held for sale in the consolidated financial statements and are recorded at the lower of aggregate cost or market value, taking into consideration future commitments to sell the loans.
Allowance for Loan Losses	Allowance for Loan Losses The Company believes the allowance for loan losses is the critical accounting policy that requires the most significant judgments and assumptions used in the preparation of its consolidated financial statements. An estimate of potential losses inherent in the loan portfolio is determined and an allowance for those losses is established by considering factors including historical loss rates, expected cash flows and estimated collateral values. In assessing these factors, the Company uses organizational history and experience with credit decisions and related outcomes. The allowance for loan losses represents the best estimate of losses inherent in the existing loan portfolio. The allowance for loan losses is increased by the provision for loan losses charged to expense and reduced by loans charged off, net of recoveries. The Company evaluates the allowance for loan losses quarterly. If the underlying assumptions later prove to be inaccurate based on subsequent loss evaluations, the allowance for loan losses is adjusted. The Company estimates the appropriate level of allowance for loan losses by separately evaluating impaired and nonimpaired loans. A specific allowance is assigned to an impaired loan when expected cash flows or collateral do not justify the carrying amount of the loan. The methodology used to assign an allowance to a nonimpaired loan is more subjective. Generally, the allowance assigned to nonimpaired loans is determined by applying historical loss rates to existing loans with similar risk characteristics, adjusted for qualitative factors including the volume and severity of identified classified loans, changes in economic conditions, changes in credit policies or underwriting standards, and changes in the level of credit risk associated with specific industries and markets. Because the economic and business climate in any given industry or market, and its impact on any given borrower, can change rapidly, the risk profile of the loan portfolio is continually assessed and adjusted when appropriate. Notwithstanding these procedures, there still exists the possibility that the assessment could prove to be significantly incorrect and that an immediate adjustment to the allowance for loan losses would be required.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization is charged to expense and determined principally by the straight-line method over the estimated useful lives of the assets. The estimated useful lives for each major depreciable classification of premises and equipment are as follows:
Goodwill and Intangible Assets	Goodwill and Intangible Assets The Company has goodwill from business combinations, identifiable intangible assets assigned to core deposit relationships and customer lists acquired, and intangible assets arising from the rights to service mortgage loans for others. Identifiable intangible assets generally arise from branches acquired that the Company accounted for as purchases. Such assets consist of the excess of the purchase price over the fair value of net assets acquired, with specific amounts assigned to core deposit relationships and customer lists primarily related to insurance agency. Intangible assets are amortized by the straight-line method over various periods up to fifteen years. Management reviews intangible assets for possible impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. In accordance with the provisions of SFAS No. 142, “ Goodwill and Other Intangible Assets ,” codified into ASC 350, the Company performed testing of goodwill for impairment as of September 30, 2017 and determined that, as of that date, goodwill was not impaired. Management also concluded that the remaining amounts and amortization periods were appropriate for all intangible assets.
Other Real Estate Owned	Other Real Estate Owned Other real estate owned acquired through loan foreclosure is initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. The adjustment at the time of foreclosure is recorded through the allowance for loan losses. Due to the subjective nature of establishing the fair value when the asset is acquired, the actual fair value of the other real estate owned or foreclosed asset could differ from the original estimate. If it is determined that fair value temporarily declines subsequent to foreclosure, a valuation allowance is recorded through noninterest expense. Operating costs associated with the assets after acquisition are also recorded as noninterest expense. Gains and losses on the disposition of other real estate owned and foreclosed assets are netted and posted to other noninterest expense.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock Federal Home Loan Bank stock is a required investment for institutions that are members of the Federal Home Loan Bank system. The required investment in the common stock is based on a predetermined formula.
Income Taxes	Income Taxes The Company and its subsidiaries file consolidated federal and state income tax returns with each organization computing its taxes on a separate company basis. Amounts provided for income tax expense are based on income reported for financial statement purposes rather than amounts currently payable under tax laws. Deferred tax assets and liabilities are recognized for future tax consequences attributable to the temporary differences existing between the financial statement carrying amounts of assets and liabilities and their respective tax basis, as well as operating loss and tax credit carry forwards. To the extent that current available evidence about the future raises doubt about the realization of a deferred tax asset, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as an increase or decrease in income tax expense in the period in which such change is enacted. On December 22, 2017, the United States enacted certain tax reforms through the Tax Cuts and Jobs Act , which changes existing tax laws, most significantly a change in the statutory corporate tax rate from 35% to 21%. As a result of this enactment, the Company incurred additional one-time income tax expense of approximately $1.4 million during the fourth quarter of 2017, primarily due to remeasurement of deferred tax assets and liabilities. Additionally, the Company reviews its uncertain tax positions annually under FASB Interpretation No. 48 (FIN No. 48), “ Accounting for Uncertainty in Income Taxes ,” codified within ASC 740. An uncertain tax position is recognized as a benefit only if it is "more likely than not" that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount actually recognized is the largest amount of tax benefit that is greater than 50% likely to be recognized on examination. For tax positions not meeting the "more likely than not" test, no tax benefit is recorded. A significant amount of judgment is applied to determine both whether the tax position meets the "more likely than not" test as well as to determine the largest amount of tax benefit that is greater than 50% likely to be recognized. Differences between the position taken by management and that of taxing authorities could result in a reduction of a tax benefit or increase to tax liability, which could adversely affect future income tax expense.
Trust Department Assets	Trust Department Assets Assets held in fiduciary or agency capacities are not included in the consolidated balance sheets since such items are not assets of the Company or its subsidiaries. Fees from trust activities are recorded on a cash basis over the period in which the service is provided. Fees are a function of the market value of assets managed and administered, the volume of transactions, and fees for other services rendered, as set forth in the underlying client agreement with the Trust & Wealth Management Division of First Mid Bank. This revenue recognition involves the use of estimates and assumptions, including components that are calculated based on asset valuations and transaction volumes. Any out of pocket expenses or services not typically covered by the fee schedule for trust activities are charged directly to the trust account on a gross basis as trust revenue is incurred.
Treasury Stock	Treasury Stock
Stock Incentive Awards	Stock Incentive Awards At the Annual Meeting of Stockholders held April 26, 2017, the stockholders approved the 2017 Stock Incentive Plan ("SI Plan"). The SI Plan was implemented to succeed the Company's 2007 Stock Incentive Plan, which had a ten-year term. The SI Plan is intended to provide a means whereby directors, employees, consultants and advisors of the Company and its Subsidiaries may sustain a sense of proprietorship and personal involvement in the continued development and financial success of the Company and its Subsidiaries, thereby advancing the interests of the Company and its stockholders. Accordingly, directors and selected employees, consultants and advisors may be provided the opportunity to acquire shares of Common Stock of the Company on the terms and conditions established in the SI Plan. A maximum of 149,983 shares of common stock may be issued under the SI Plan. Prior to December 31, 2008, the Company had awarded 59,500 shares as stock options under the 2007 SI plan. There have been no stock options awarded since 2008. The Company awarded 18,391 , 13,912 , and 18,002

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The components of accumulated other comprehensive income (loss) included in stockholders’ equity as of December 31, 2017 and 2016 are as follows (in thousands): Unrealized Gain (Loss) on Securities Securities with Other-Than-Temporary Impairment Losses Total December 31, 2017 Net unrealized losses on securities available-for-sale $ (2,619 ) $ — $ (2,619 ) Unamortized losses on securities held-to-maturity transferred from available-for-sale (281 ) — (281 ) Securities with other-than-temporary impairment losses — (345 ) (345 ) Tax benefit 841 100 941 Balance at December 31, 2017 $ (2,059 ) $ (245 ) $ (2,304 ) December 31, 2016 Net unrealized losses on securities available-for-sale $ (7,649 ) $ — $ (7,649 ) Unamortized losses on securities held-to-maturity transferred from available-for-sale (393 ) — (393 ) Securities with other-than-temporary impairment losses — (1,398 ) (1,398 ) Tax benefit 3,134 545 3,679 Balance at December 31, 2016 $ (4,908 ) $ (853 ) $ (5,761 )
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income [Table Text Block]	Amounts reclassified from accumulated other comprehensive income and the affected line items in the statements of income during the years ended December 31, 2017, 2016 and 2015 , were as follows (in thousands): Amounts Reclassified from Other Comprehensive Income Affected Line Item in the Statements of Income 2017 2016 2015 Realized gains on available-for-sale securities $ 616 1,192 452 Securities gains, net (Total reclassified amount before tax) (216 ) (465 ) (176 ) Tax expense Total reclassifications out of accumulated other comprehensive income $ 400 $ 727 $ 276 Net reclassified amount

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Components of Basic and Diluted Net Income per Common Share	The components of basic and diluted net income per common share available to common stockholders for the years ended December 31, 2017, 2016 and 2015 were as follows: 2017 2016 2015 Basic Net Income per Common Share Available to Common Stockholders: Net income $ 26,684,000 $ 21,840,000 $ 16,512,000 Preferred stock dividends — (825,000 ) (2,200,000 ) Net income available to common stockholders 26,684,000 21,015,000 14,312,000 Weighted average common shares outstanding 12,531,659 10,149,099 7,775,490 Basic earnings per common share $ 2.13 $ 2.07 $ 1.84 Diluted Net Income per Common Share Available to Common Stockholders: Net income available to common stockholders $ 26,684,000 $ 21,015,000 $ 14,312,000 Effect of assumed preferred stock conversion — 825,000 2,200,000 Net income applicable to diluted earnings per share 26,684,000 21,840,000 16,512,000 Weighted average common shares outstanding 12,531,659 10,149,099 7,775,490 Dilutive potential common shares: Assumed conversion of stock options 4,875 3,111 — Restricted stock awarded — 4,107 6,851 Assumed conversion of preferred stock — 507,393 1,355,348 Dilutive potential common shares 4,875 514,611 1,362,199 Diluted weighted average common shares outstanding 12,536,534 10,663,710 9,137,689 Diluted earnings per common share $ 2.13 $ 2.05 $ 1.81
Anti-dilutive Securities	The following shares were not considered in computing diluted earnings per share for the years ended December 31, 2017, 2016 and 2015 because they were anti-dilutive: 2017 2016 2015 Stock options to purchase shares of common stock — — 45,500

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Available For Sale And Held For Maturity Securities [Table Text Block]	The amortized cost, gross unrealized gains and losses and estimated fair values for available-for-sale and held-to-maturity securities by major security type at December 31, 2017 and December 31, 2016 were as follows (in thousands): December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 115,796 $ 8 $ (2,034 ) $ 113,770 Obligations of states and political subdivisions 165,037 2,254 (1,025 ) 166,266 Mortgage-backed securities: GSE residential 295,778 493 (2,460 ) 293,811 Trust preferred securities 2,893 — (345 ) 2,548 Other securities 2,039 145 — 2,184 Total available-for-sale $ 581,543 $ 2,900 $ (5,864 ) $ 578,579 Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 69,332 $ 103 $ (978 ) $ 68,457 December 31, 2016 Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 138,819 $ 13 $ (2,508 ) $ 136,324 Obligations of states and political subdivisions 164,163 1,346 (2,804 ) 162,705 Mortgage-backed securities: GSE residential 318,829 531 (4,369 ) 314,991 Trust preferred securities 3,050 — (1,398 ) 1,652 Other securities 4,034 147 (5 ) 4,176 Total available-for-sale $ 628,895 $ 2,037 $ (11,084 ) $ 619,848 Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations & agencies $ 74,231 $ 203 $ (1,338 ) $ 73,096 Trust preferred securities at December 31, 2017 , is one trust preferred pooled security issued by First Tennessee Financial (“FTN”). The unrealized loss of this security, which has a maturity of twenty years, is primarily due to its long-term nature, a lack of demand or inactive market for the security, and concerns regarding the underlying financial institutions that have issued the trust preferred security. See the heading “Trust Preferred Securities” below for further information regarding this security.
Realized Gains and Losses From Sale of Securities	Proceeds from sales of investment securities, realized gains and losses and income tax expense and benefit were as follows during the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Proceeds from sales $ 159,663 $ 70,757 $ 19,380 Gross gains 773 1,192 452 Gross losses (157 ) — — Income tax expense 216 465 176
Investments Classified by Contractual Maturity Date	The following table indicates the expected maturities of investment securities classified as available-for-sale presented at fair value, and held-to-maturity presented at amortized cost at December 31, 2017 and the weighted average yield for each range of maturities (in thousands): One year or less After 1 through 5 years After 5 through 10 years After ten years Total Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 70,462 $ 38,359 $ 4,949 $ — $ 113,770 Obligations of state and political subdivisions 16,897 74,454 73,297 1,618 166,266 Mortgage-backed securities: GSE residential 75 168,002 125,734 — 293,811 Trust preferred securities — — — 2,548 2,548 Other securities — 2,012 — 172 2,184 Total investments $ 87,434 $ 282,827 $ 203,980 $ 4,338 $ 578,579 Weighted average yield 2.28 % 3.30 % 4.11 % 2.74 % 3.42 % Full tax-equivalent yield 2.67 % 3.82 % 4.88 % 3.55 % 4.01 % Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 39,993 $ 29,339 $ — $ — $ 69,332 Weighted average yield 1.76 % 2.08 % — % — % 1.90 % Full tax-equivalent yield 1.76 % 2.08 % — % — % 1.90 % The weighted average yields are calculated on the basis of the amortized cost and effective yields weighted for the scheduled maturity of each security. Tax-equivalent yields have been calculated using a 35% tax rate. With the exception of obligations of the U.S. Treasury and other U.S. government agencies and corporations, there were no investment securities of any single issuer, the book value of which exceeded 10% of stockholders' equity at December 31, 2017 .
Fair value of investments with sustained gross unrealized losses	The following table presents the aging of gross unrealized losses and fair value by investment category as of December 31, 2017 and 2016 (in thousands): Less than 12 months 12 months or more Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2017 Available-for-sale: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 58,584 $ (540 ) $ 47,972 $ (1,494 ) $ 106,556 $ (2,034 ) Obligations of states and political subdivisions 42,618 (769 ) 9,267 (256 ) 51,885 (1,025 ) Mortgage-backed securities: GSE residential 187,949 (1,942 ) 22,609 (518 ) 210,558 (2,460 ) Trust preferred securities — — 2,548 (345 ) 2,548 (345 ) Other securities — — — — — — Total $ 289,151 $ (3,251 ) $ 82,396 $ (2,613 ) $ 371,547 $ (5,864 ) Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 34,101 $ (525 ) $ 14,540 $ (453 ) $ 48,641 $ (978 ) December 31, 2016 U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 125,257 $ (2,508 ) $ — $ — $ 125,257 $ (2,508 ) Obligations of states and political subdivisions 93,405 (2,804 ) — — 93,405 (2,804 ) Mortgage-backed securities: GSE residential 266,319 (4,099 ) 5,878 (270 ) 272,197 (4,369 ) Trust preferred securities — — 1,652 (1,398 ) 1,652 (1,398 ) Other securities — — 1,995 (5 ) 1,995 (5 ) Total $ 484,981 $ (9,411 ) $ 9,525 $ (1,673 ) $ 494,506 $ (11,084 ) Held-to-maturity: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 53,295 $ (1,338 ) $ — $ — $ 53,295 $ (1,338 )
Trust Preferred Securities [Table Text Block]	Following are the details for the impaired trust preferred security remaining as of December 31, 2017 (in thousands): Book Value Market Value Unrealized Gains (Losses) Other-than- temporary Impairment Recorded To-date PreTSL XXVIII $ 2,893 $ 2,548 $ (345 ) $ (1,111 )
Credit Losses Recognized on Investments	As described above, some of the Company’s investments in trust preferred securities have experienced fair value deterioration due to credit losses but are not otherwise other-than-temporarily impaired. The following table provides information about those trust preferred securities for which only a credit loss was recognized in income and other losses are recorded in other comprehensive income (loss) for the years ended December 31, 2017, 2016 and 2015 (in thousands). Accumulated Credit Losses as of December 31: 2017 2016 2015 Credit losses on trust preferred securities held: Beginning of period $ 1,111 $ 1,111 $ 1,111 Additions related to OTTI losses not previously recognized — — — Reductions due to sales / (recoveries) — — — Reductions due to change in intent or likelihood of sale — — — Additions related to increases in previously recognized OTTI losses — — — Reductions due to increases in expected cash flows — — — End of period $ 1,111 $ 1,111 $ 1,111
Maturities of Investment Securities	Amortized Cost Estimated Fair Value Available-for-sale: Due in one year or less $ 88,726 $ 87,358 Due after one-five years 114,719 114,825 Due after five-ten years 77,765 78,246 Due after ten years 4,555 4,339 285,765 284,768 Mortgage-backed securities: GSE residential 295,778 293,811 Total available-for-sale 581,543 578,579 Held-to-maturity: Due in one year or less 39,993 39,105 Due after one-five years 29,339 29,352 Due after five-ten years — — Due after ten years — — Total held-to-maturity 69,332 $ 68,457 Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

Loans and Allowance for Loan 36

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Summary of Loans	Loans are stated at the principal amount outstanding net of unearned discounts, unearned income and allowance for loan losses. Unearned income includes deferred loan origination fees reduced by loan origination costs and is amortized to interest income over the life of the related loan using methods that approximated the effective interest rate method. Interest on substantially all loans is credited to income based on the principal amount outstanding. A summary of loans at December 31, 2017 and 2016 follows (in thousands): 2017 2016 Construction and land development $ 107,721 $ 49,366 Farm loans 127,232 126,216 1-4 Family residential properties 294,483 328,119 Multifamily residential properties 61,966 83,478 Commercial real estate 684,639 633,694 Loans secured by real estate 1,276,041 1,220,873 Agricultural loans 86,602 86,735 Commercial and industrial loans 445,378 412,637 Consumer loans 30,070 38,404 All other loans 108,023 77,602 Gross loans 1,946,114 1,836,251 Less: Loans held for sale 1,025 1,175 1,945,089 1,835,076 Less: Net deferred loan fees, premiums and discounts 6,613 10,259 Allowance for loan losses 19,977 16,753 Net loans $ 1,918,499 $ 1,808,064
Allowance for Loan Losses and Recorded Investment in Loans	The following tables present the balance in the allowance for loan losses and the recorded investment in loans based on portfolio segment and impairment method as of December 31, 2017, 2016 and 2015 (in thousands): Commercial/ Commercial Real Estate Agricultural/ Agricultural Real Estate Residential Real Estate Consumer Unallocated Total December 31, 2017 Allowance for loan losses: Balance, beginning of year $ 12,901 $ 2,249 $ 874 $ 693 $ 36 $ 16,753 Provision charged to expense 6,884 153 100 361 (36 ) 7,462 Losses charged off (3,795 ) (662 ) (217 ) (521 ) — (5,195 ) Recoveries 556 2 129 270 — 957 Balance, end of period $ 16,546 $ 1,742 $ 886 $ 803 $ — $ 19,977 Ending balance: Individually evaluated for impairment $ 586 $ 2 $ 25 $ 1 $ — $ 614 Collectively evaluated for impairment $ 15,951 $ 1,740 $ 861 $ 802 $ — $ 19,354 Loans acquired with deteriorated credit quality $ 9 $ — $ — $ — $ — $ 9 Loans: Ending balance $ 1,371,787 $ 213,521 $ 315,123 $ 39,070 $ — $ 1,939,501 Ending Balance: Individually evaluated for impairment $ 11,372 $ 488 $ 1,026 $ 200 $ — $ 13,086 Collectively evaluated for impairment $ 1,360,156 $ 213,033 $ 314,097 $ 38,870 $ — $ 1,926,156 Loans acquired with deteriorated credit quality $ 259 $ — $ — $ — $ — $ 259 Commercial/ Commercial Real Estate Agricultural/ Agricultural Real Estate Residential Real Estate Consumer Unallocated Total December 31, 2016 Allowance for loan losses: Balance, beginning of year $ 11,379 $ 1,337 $ 994 $ 642 $ 224 $ 14,576 Provision charged to expense 1,467 933 113 501 (188 ) 2,826 Losses charged off (747 ) (30 ) (234 ) (664 ) — (1,675 ) Recoveries 802 9 1 214 — 1,026 Balance, end of period $ 12,901 $ 2,249 $ 874 $ 693 $ 36 $ 16,753 Ending balance: Individually evaluated for impairment $ 192 $ 660 $ 6 $ — $ — $ 858 Collectively evaluated for impairment $ 12,695 $ 1,589 $ 868 $ 693 $ 36 $ 15,881 Loans: Ending balance $ 1,204,799 $ 212,513 $ 366,823 $ 41,857 $ — $ 1,825,992 Ending balance: Individually evaluated for impairment $ 1,956 $ 1,345 $ 1,752 $ 213 $ — $ 5,266 Collectively evaluated for impairment $ 1,199,003 $ 211,168 $ 360,825 $ 41,644 $ — $ 1,812,640 Loans acquired with deteriorated credit quality $ 3,840 $ — $ 4,246 $ — $ — $ 8,086 December 31, 2015 Allowance for loan losses: Balance, beginning of year $ 10,914 $ 1,360 $ 790 $ 386 $ 232 $ 13,682 Provision charged to expense 451 (25 ) 267 633 (8 ) 1,318 Losses charged off (289 ) — (64 ) (553 ) — (906 ) Recoveries 303 2 1 176 — 482 Balance, end of year $ 11,379 $ 1,337 $ 994 $ 642 $ 224 $ 14,576 Ending balance: Individually evaluated for impairment $ 134 $ — $ — $ — $ — $ 134 Collectively evaluated for impairment $ 11,245 $ 1,337 $ 994 $ 642 $ 224 $ 14,442 Loans: Ending balance $ 807,736 $ 198,066 $ 232,348 $ 43,739 $ — $ 1,281,889 Ending balance: Individually evaluated for impairment $ 744 $ 430 $ — $ — $ — $ 1,174 Collectively evaluated for impairment $ 806,992 $ 197,636 $ 232,348 $ 43,739 $ — $ 1,280,715
Credit Risk Profile of the Company's Loan Portfolio	Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered pass rated loans. The following tables present the credit risk profile of the Company’s loan portfolio based on rating category and payment activity as of December 31, 2017 and 2016 (in thousands): Construction & Land Development Farm Loans 1-4 Family Residential Properties Multifamily Residential Properties 2017 2016 2017 2016 2017 2016 2017 2016 Pass $ 107,140 $ 48,877 $ 120,767 $ 118,934 $ 282,441 $ 318,921 $ 60,954 $ 81,018 Special Mention 454 — 4,829 5,190 2,654 918 476 1,651 Substandard — 227 1,587 1,984 8,572 6,576 368 531 Doubtful — — — — — — — — Total $ 107,594 $ 49,104 $ 127,183 $ 126,108 $ 293,667 $ 326,415 $ 61,798 $ 83,200 Commercial Real Estate (Nonfarm/Nonresidential) Agricultural Loans Commercial & Industrial Loans Consumer Loans 2017 2016 2017 2016 2017 2016 2017 2016 Pass $ 647,208 $ 610,025 $ 83,469 $ 81,922 $ 425,846 $ 397,762 $ 29,375 $ 37,624 Special Mention 16,941 5,229 2,304 3,271 11,492 8,485 5 17 Substandard 17,608 14,881 858 1,492 6,925 2,786 369 387 Doubtful — — — — — — — — Total $ 681,757 $ 630,135 $ 86,631 $ 86,685 $ 444,263 $ 409,033 $ 29,749 $ 38,028 All Other Loans Total Loans 2017 2016 2017 2016 Pass $ 103,339 $ 74,377 $ 1,860,539 $ 1,769,460 Special Mention 3,520 2,892 42,675 27,653 Substandard — 15 36,287 28,879 Doubtful — — — — Total $ 106,859 $ 77,284 $ 1,939,501 $ 1,825,992
Loan Portfolio Aging Analysis	The following table presents the Company’s loan portfolio aging analysis at December 31, 2017 and 2016 (in thousands): 30-59 days Past Due 60-89 days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Total Loans > 90 days & Accruing December 31, 2017 Construction and land development $ 26 $ 48 $ — $ 74 $ 107,520 $ 107,594 $ — Farm loans — — 396 396 126,787 127,183 — 1-4 Family residential properties 3,023 538 1,767 5,328 288,339 293,667 — Multifamily residential properties — — — — 61,798 61,798 — Commercial real estate 90 38 3,566 3,694 678,063 681,757 — Loans secured by real estate 3,139 624 5,729 9,492 1,262,507 1,271,999 — Agricultural loans — 32 158 190 86,441 86,631 — Commercial and industrial loans 192 3 770 965 443,298 444,263 — Consumer loans 178 67 27 272 29,477 29,749 — All other loans — — — — 106,859 106,859 — Total loans $ 3,509 $ 726 $ 6,684 $ 10,919 $ 1,928,582 $ 1,939,501 $ — December 31, 2016 Construction and land development $ — $ — $ — $ — $ 49,104 $ 49,104 $ — Farm loans — 131 293 424 125,684 126,108 — 1-4 Family residential properties 1,854 713 1,008 3,575 322,840 326,415 105 Multifamily residential properties — — 240 240 82,960 83,200 — Commercial real estate 1,662 716 43 2,421 627,714 630,135 — Loans secured by real estate 3,516 1,560 1,584 6,660 1,208,302 1,214,962 105 Agricultural loans 365 84 37 486 86,199 86,685 — Commercial and industrial loans 395 155 249 799 408,234 409,033 — Consumer loans 192 37 11 240 37,788 38,028 — All other loans — — — — 77,284 77,284 — Total loans $ 4,468 $ 1,836 $ 1,881 $ 8,185 $ 1,817,807 $ 1,825,992 $ 105
Impaired Loans	The following tables present impaired loans as of December 31, 2017 and 2016 (in thousands): 2017 2016 Recorded Balance Unpaid Principal Balance Specific Allowance Recorded Balance Unpaid Principal Balance Specific Allowance Loans with a specific allowance: Construction and land development $ — $ — $ — $ 227 $ 227 $ — Farm loans 276 276 — — — — 1-4 Family residential properties 1,026 1,347 25 997 997 6 Multifamily residential properties 313 313 — 528 528 — Commercial real estate 5,544 5,565 531 863 884 — Loans secured by real estate 7,159 7,501 556 2,615 2,636 6 Agricultural loans 212 1,009 2 1,345 1,345 660 Commercial and industrial loans 5,774 6,037 64 1,093 1,191 192 Consumer loans 200 200 1 213 213 — All other loans — — — — — — Total loans $ 13,345 $ 14,747 $ 623 $ 5,266 $ 5,385 $ 858 Loans without a specific allowance: Construction and land development $ — $ — $ — $ — $ — $ — Farm loans 15 15 — 205 207 — 1-4 Family residential properties 2,239 2,664 — 2,497 3,207 — Multifamily residential properties 55 55 — 3,419 3,547 — Commercial real estate 303 368 — 6,224 6,802 — Loans secured by real estate 2,612 3,102 — 12,345 13,763 — Agricultural loans 545 — — 43 66 — Commercial and industrial loans 909 1,249 — 378 572 — Consumer loans 102 119 — 206 211 — All other loans — — — — — — Total loans $ 4,168 $ 4,470 $ — $ 12,972 $ 14,612 $ — Total loans: Construction and land development $ — $ — $ — $ 227 $ 227 $ — Farm loans 291 291 — 205 207 — 1-4 Family residential properties 3,265 4,011 25 3,494 4,204 6 Multifamily residential properties 368 368 — 3,947 4,075 — Commercial real estate 5,847 5,933 531 7,087 7,686 — Loans secured by real estate 9,771 10,603 556 14,960 16,399 6 Agricultural loans 757 1,009 2 1,388 1,411 660 Commercial and industrial loans 6,683 7,286 64 1,471 1,763 192 Consumer loans 302 319 1 419 424 — All other loans — — — — — — Total loans $ 17,513 $ 19,217 $ 623 $ 18,238 $ 19,997 $ 858
Impaired loans by portfolio class	The following tables present average recorded investment and interest income recognized on impaired loans for the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Average Investment in Impaired Loans Interest Income Recognized Average Investment in Impaired Loans Interest Income Recognized Average Investment in Impaired Loans Interest Income Recognized Construction and land development $ — $ — $ 229 $ — $ 142 $ — Farm loans 293 — 207 — 527 2 1-4 Family residential properties 3,267 29 2,988 22 1,440 14 Multifamily residential properties 377 1 3,824 55 323 — Commercial real estate 5,457 13 6,675 36 310 2 Loans secured by real estate 9,394 43 13,923 113 2,742 18 Agricultural loans 878 — 1,394 — 82 — Commercial and industrial loans 6,586 8 1,485 4 1,569 8 Consumer loans 325 — 557 2 319 2 All other loans — — — — — — Total loans $ 17,183 $ 51 $ 17,359 $ 119 $ 4,712 $ 28 The amount of interest income recognized by the Company within the periods stated above was due to loans modified in a troubled debt restructuring that remained on accrual status. The balance of loans modified in a troubled debt restructuring included in the impaired loans stated above that were still accruing was $578,000 of 1-4 Family residential properties, $251,000 of commercial real estate, and $25,000 of commercial and industrial loans at December 31, 2017 and $603,000 of 1-4 Family residential properties, $3,419,000 of multifamily residential properties, $2,116,000 of commercial real estate loans, $41,000 of commercial and industrial loans and $6,000 of consumer loans at December 31, 2016 . For the years ended December 31, 2017, 2016 and 2015 , the amount of interest income recognized using a cash-basis method of accounting during the period that the loans were impaired was not material.
Nonaccrual Loans	The following table presents the Company’s recorded balance of nonaccrual loans at December 31, 2017 and December 31, 2016 (in thousands). This table excludes purchased credit-impaired loans and performing troubled debt restructurings. 2017 2016 Construction and land development $ — $ 227 Farm loans 291 205 1-4 Family residential properties 2,687 2,890 Multifamily residential properties 368 528 Commercial real estate 5,596 4,971 Loans secured by real estate 8,942 8,821 Agricultural loans 757 1,388 Commercial and industrial loans 6,658 1,430 Consumer loans 302 414 All other loans — — Total loans $ 16,659 $ 12,053
Schedule of Acquired Receivables With Credit Deterioration [Table Text Block]	The Company acquired certain loans considered to be credit-impaired in its business combination with First Clover Leaf during the third quarter of 2016. At acquisition, these loans evidenced deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of these loans is included in the consolidated balance sheet amounts for Loans. The Company had no PCI loans prior to the First Clover Leaf acquisition. The amount of these loans at December 31, 2017 are as follows (in thousands): December 31, 2017 December 31, 2016 1-4 Family residential properties $ — $ 622 Multifamily residential properties — 1,011 Commercial real estate 251 3,723 Loans secured by real estate 251 5,356 Commercial and industrial loans 8 2,730 Carrying amount 259 8,086 Allowance for loan losses 9 14 Carrying amount, net of allowance $ 250 $ 8,072
Acquired Receivables With Credit Deterioration, Values at Acquisition [Table Text Block]	The PCI loans acquired during the twelve months ended December 31, 2016 for which it was probable that all contractually required payments would not be collected were as follows (in thousands): December 31, Contractually required payments $ 10,650 Non-accretable difference (1,962 ) Cash flows expected to be collected at acquisition 8,688 Accretable yield — Fair value of acquired loans at acquisition $ 8,688
Recorded Balance of Troubled Debt Restructurings	The following table presents the Company’s recorded balance of troubled debt restructurings at December 31, 2017 and 2016 (in thousands). Troubled debt restructurings: 2017 2016 Construction and land development $ — $ 227 Farm Loans — — 1-4 Family residential properties 874 1,753 Multifamily residential properties — 3,419 Commercial real estate 1,376 4,125 Loans secured by real estate 2,250 9,524 Agricultural loans 757 — Commercial and industrial loans 5,690 1,040 Consumer Loans 201 325 Total $ 8,898 $ 10,889 Performing troubled debt restructurings: 1-4 Family residential properties $ 578 $ 603 Multifamily residential properties — 3,419 Commercial real estate 251 2,116 Loans secured by real estate 829 6,138 Commercial and industrial loans 25 41 Consumer Loans — 6 Total $ 854 $ 6,185

Premises and Equipment, Net (Ta

Premises and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and equipment	Premises and equipment at December 31, 2017 and 2016 consisted of (in thousands): 2017 2016 Land $ 9,933 $ 5,837 Buildings and improvements 37,229 44,484 Furniture and equipment 16,145 18,340 Leasehold improvements 4,109 4,089 Construction in progress 29 286 Subtotal 67,445 73,036 Accumulated depreciation and amortization 29,179 32,744 Total $ 38,266 $ 40,292

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	The Company has goodwill from business combinations, intangible assets from branch acquisitions, identifiable intangible assets assigned to core deposit relationships and customer lists of insurance agencies acquired. The following table presents gross carrying amount and accumulated amortization by major intangible asset class as of December 31, 2017 and 2016 (in thousands): 2017 2016 Gross Carrying Value Accumulated Amortization Gross Carrying Value Accumulated Amortization Goodwill not subject to amortization $ 63,910 $ 3,760 $ 61,551 $ 3,760 Intangibles from branch acquisition 3,015 3,015 3,015 3,015 Core deposit intangibles 19,862 11,473 19,862 9,644 Customer list intangibles 3,731 2,285 3,731 2,102 $ 90,518 $ 20,533 $ 88,159 $ 18,521
Reconciliation of purchase price to goodwill recorded [Table Text Block]	The following table provides a reconciliation of the purchase price paid for First Clover Leaf and the amount of goodwill recorded (in thousands): Purchase price $ 8,741 Less purchase accounting adjustments: Fair value of securities 737 Fair value of loans 3,475 Fair value of OREO 754 Fair value of premises and equipment (1,963 ) Fair value of time deposits 1,994 Fair value of FHLB advances 113 Fair value of subordinated debentures (731 ) Core deposit intangible (4,660 ) Other Assets 10,683 10,402 Resulting goodwill from acquisition $ 19,143
Intangible Assets, Mortgage Servicing Rights [Table Text Block]	As part of the acquisition of First Clover Leaf Bank, the Company acquired mortgage servicing righted valued at $1,069,000 . The following table summarizes the activity pertaining to the mortgage servicing rights included in intangible assets as of December 31, 2017 and 2016 (in thousands): December 31, 2017 December 31, 2016 Beginning Balance 985 — Acquired Balance — 1,069 Mortgage Servicing rights capitalized — 14 Mortgage Servicing rights amortized (141 ) (98 ) Ending Balance $ 844 $ 985
Schedule of Intangible Assets Amortization Expense [Table Text Block]	Total amortization expense for the years ended December 31, 2017, 2016 and 2015 was as follows (in thousands): 2017 2016 2015 Core deposit intangibles 1,829 1,628 876 Customer list intangibles 183 183 15 Mortgage Servicing Rights 141 98 — $ 2,153 $ 1,909 $ 891
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	stimated amortization expense for each of the five succeeding years is shown in the table below (in thousands): For year ended 12/31/18 $ 1,954 For year ended 12/31/19 1,778 For year ended 12/31/20 1,576 For year ended 12/31/21 1,304 For year ended 12/31/22 1,195

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Schedule of Deposits [Table Text Block]	As of December 31, 2017 and 2016 , deposits consisted of the following (in thousands): 2017 2016 Demand deposits: Non-interest bearing $ 480,283 $ 471,206 Interest-bearing 700,376 716,204 Savings 359,065 356,740 Money market 390,880 432,656 Time deposits 344,035 353,081 Total deposits $ 2,274,639 $ 2,329,887
Components of deposit interest expense [Table Text Block]	Total interest expense on deposits for the years ended December 31, 2017, 2016 and 2015 was as follows (in thousands): 2017 2016 2015 Interest-bearing demand $ 588 $ 274 $ 117 Savings 486 445 398 Money market 1,224 719 605 Time deposits 1,697 1,275 1,162 Total $ 3,995 $ 2,713 $ 2,282
Aggregate Time Deposits more than 100,000 and related interest expense [Table Text Block]	As of December 31, 2017, 2016 and 2015 , the aggregate amount of time deposits in denominations of more than $100,000 and the total interest expense on such deposits was as follows (in thousands): 2017 2016 2015 Outstanding $ 167,073 $ 151,262 $ 88,855 Interest expense for the year 730 423 493
Maturities of Time Deposits [Table Text Block]	The following table shows the amount of maturities for all time deposits as of December 31, 2017 (in thousands): Less than 1 year $ 224,622 1 year to 2 years 55,529 2 years to 3 years 35,529 3 years to 4 years 15,568 4 years to 5 years 11,914 Over 5 years 873 Total $ 344,035

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Borrowings	As of December 31, 2017 and 2016 borrowings consisted of the following (in thousands): 2017 2016 Securities sold under agreements to repurchase $ 155,388 $ 185,763 Federal Home Loan Bank (FHLB) Fixed-term advances 60,038 40,094 Subordinated debentures 24,000 23,917 Other borrowings: Due in one year or less — 4,000 Due after one year (2020) 10,313 14,063 Total $ 249,739 $ 267,837
Aggregate annual maturities of long-term borrowings	Aggregate annual maturities of FHLB advances and subordinated debentures (excluding unamortized discounts and premiums) at December 31, 2017 are (in thousands): FHLB Subordinated Debentures 2018 $ 25,000 $ — 2019 5,000 — 2020 15,000 — 2021 10,000 — 2022 — — Thereafter 5,000 24,620 $ 60,000 $ 24,620 Unamortized premium (discount) $ 38 $ (620 ) $ 60,038 $ 24,000
Securities underlying the repurchase agreements	(in thousands) 2017 2016 2015 Securities sold under agreements to repurchase: Maximum outstanding at any month-end $ 163,626 $ 185,763 $ 128,842 Average amount outstanding for the year 144,674 129,734 113,748

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2017
Regulatory Capital [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	s of December 31, 2017 and 2016 , the most recent notification from the primary regulators categorized First Mid Bank and FIrst Clover Leaf Bank (prior to its merger into First Mid Bank) as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, minimum total risk-based capital, Tier 1 risk-based capital, Common Equity Tier 1 risk-based capital, and Tier 1 leverage ratios must be maintained as set forth in the table below. At December 31, 2017 , there were no conditions or events since the most recent notification that management believes have changed this categorization. Actual Required Minimum For Capital Adequacy Purposes with Capital Buffer To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount (in thousands) Ratio Amount (in thousands) Ratio Amount (in thousands) Ratio December 31, 2017 Total Capital (to risk-weighted assets) Company $ 290,843 12.70 % $ 211,848 > 9.25% N/A N/A First Mid Bank 282,621 12.39 % 211,064 > 9.25 $ 228,177 > 10.00% Tier 1 Capital (to risk-weighted assets) Company 270,866 11.83 % 166,043 > 7.25 N/A N/A First Mid Bank 262,644 11.51 % 165,428 > 7.25 182,542 > 8.00 Common Equity Tier 1 Capital (to risk-weighted assets) Company 246,866 10.78 % 131,690 > 5.75 N/A N/A First Mid Bank 262,644 11.51 % 131,202 > 5.75 148,315 > 6.50 Tier 1 Capital (to average assets) Company 270,866 9.91 % 109,381 > 4.00 N/A N/A First Mid Bank 262,644 9.63 % 109,113 > 4.00 136,392 > 5.00 December 31, 2016 Total Capital (to risk-weighted assets) Company $ 270,062 12.79 % $ 182,137 > 8.625% N/A N/A First Mid Bank 197,552 12.44 % 137,019 > 8.625 $ 158,817 > 10.00% First Clover Leaf Bank 78,145 15.08 % 44,698 > 8.625 51,824 > 10.00% Tier 1 Capital (to risk-weighted assets) Company 253,258 11.99 % 139,903 > 6.625 N/A N/A First Mid Bank 180,826 11.39 % 105,247 > 6.625 127,090 > 8.00 First Clover Leaf Bank 78,145 15.08 % 34,333 > 6.625 41,459 > 8.00 Common Equity Tier 1 Capital (to risk-weighted assets) Company 229,341 10.86 % 108,226 > 5.125 N/A N/A First Mid Bank 180,826 11.39 % 81,417 > 5.125 103,261 > 6.50 First Clover Leaf Bank 78,145 15.08 % 26,560 > 5.125 33,685 > 6.50 Tier 1 Capital (to average assets) Company 253,258 9.19 % 110,242 > 4.00 N/A N/A First Mid Bank 180,826 8.62 % 83,938 > 4.00 104,922 > 5.00 First Clover Leaf Bank 78,145 12.04 % 25,963 > 4.00 32,453 > 5.00 The Company's risk-weighted assets, capital and capital ratios for December 31, 2017 are computed in accordance with Basel III capital rules which were effective January 1, 2015. Prior periods are computed following previous rules. See heading "Basel III" in the Overview section of this report for a more detailed description of Basel III rules. As of December 31, 2017, the Company and First Mid Bank had capital ratios above the required minimums for regulatory capital adequacy, and First Mid Bank had capital ratios that qualified it for treatment as well-capitalized under the regulatory framework for prompt corrective action with respect to banks. First Clover Leaf Bank merged into First Mid Bank during the first quarter of 2017.

Disclosures of Fair Values of42

Disclosures of Fair Values of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on Recurring Basis	The following table presents the Company’s assets that are measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall as of December 31, 2017 and 2016 (in thousands): Fair Value Measurements Using: Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Available-for-sale securities: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 113,770 $ — $ 113,770 $ — Obligations of states and political subdivisions 166,266 — 166,266 — Mortgage-backed securities 293,811 — 293,811 — Trust preferred securities 2,548 — — 2,548 Other securities 2,184 172 2,012 — Total available-for-sale securities $ 578,579 $ 172 $ 575,859 $ 2,548 December 31, 2016 Available-for-sale securities: U.S. Treasury securities and obligations of U.S. government corporations and agencies $ 136,324 $ — $ 136,324 $ — Obligations of states and political subdivisions 162,705 — 162,705 — Mortgage-backed securities 314,991 — 314,991 — Trust preferred securities 1,652 — — 1,652 Other securities 4,176 144 4,032 — Total available-for-sale securities $ 619,848 $ 144 $ 618,052 $ 1,652
Fair Value of Assets Measured on a Recurring Basis Using Significant Unobservable Inputs	The change in fair value of assets measured on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2017 and 2016 is summarized as follows (in thousands): Trust Preferred Securities December 31, 2017 December 31, 2016 Beginning balance $ 1,652 $ 1,906 Transfers into Level 3 — — Transfers out of Level 3 — — Total gains or losses Included in net income — — Included in other comprehensive income (loss) 1,053 (174 ) Purchases, issuances, sales and settlements Purchases — — Issuances — — Sales — — Settlements (157 ) (80 ) Ending balance $ 2,548 $ 1,652 Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date $ — $ —
Assets Measured at Fair Value on a Nonrecurring Basis	The following table presents the fair value measurement of assets measured at fair value on a nonrecurring basis and the level within the fair value hierarchy in which the fair value measurements fall at December 31, 2017 and 2016 (in thousands): Fair Value Measurements Using Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) December 31, 2017 Impaired loans (collateral dependent) $ 3,053 $ — $ — $ 3,053 Foreclosed assets held for sale 91 — — 91 December 31, 2016 Impaired loans (collateral dependent) $ 6,938 $ — $ — $ 6,938 Foreclosed assets held for sale 173 — — 173
Significant Assumptions Used in Valuation of Level 3 Financial Instruments	The following table presents quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements other than goodwill at December 31, 2017 . Fair Value (in thousands) Valuation Technique Unobservable Inputs Range (Weighted Average) Trust Preferred Securities $ 2,548 Discounted cash flow Discount rate 12.7 % Constant prepayment rate (1) 1.3 % Cumulative projected prepayments 21.6 % Probability of default 0.5 % Projected cures given deferral 0.0 % Loss severity 97.7 % Impaired loans (collateral dependent) 3,053 Third party valuations Discount to reflect realizable value 0 % - 40% ( 20 % ) Foreclosed assets held for sale 91 Third party valuations Discount to reflect realizable value less estimated selling costs 0 % - 40% ( 35 % ) (1) Every five years
Carrying Amounts and Estimated Fair Values of Financial Instruments Not Carried at Fair Value	The following tables present estimated fair values of the Company’s financial instruments at December 31, 2017 and 2016 in accordance with FAS 107-1 and APB 28-1, codified with ASC 805 (in thousands): Carrying Amount Fair Value Level 1 Level 2 Level 3 December 31, 2017 Financial Assets Cash and due from banks $ 88,388 $ 88,388 $ 88,388 $ — $ — Federal funds sold 491 491 491 — — Certificates of deposit investments 1,685 1,692 — 1,692 — Available-for-sale securities 578,579 578,579 172 575,859 2,548 Held-to-maturity securities 69,332 68,457 — 68,457 — Loans held for sale 1,025 1,025 — 1,025 — Loans net of allowance for loan losses 1,918,499 1,899,678 — — 1,899,678 Interest receivable 10,832 10,832 — 10,832 — Federal Reserve Bank stock 5,160 5,160 — 5,160 — Federal Home Loan Bank stock 2,407 2,407 — 2,407 — Financial Liabilities Deposits 2,274,639 2,272,868 — 1,930,604 342,264 Securities sold under agreements to repurchase 155,388 155,394 — 155,394 — Interest payable 602 602 — 602 — Federal Home Loan Bank borrowings 60,038 59,968 — 59,968 — Other borrowings 10,313 10,313 — 10,313 — Junior subordinated debentures 24,000 18,050 — 18,050 — December 31, 2016 Financial Assets Cash and due from banks $ 137,002 $ 137,002 $ 137,002 $ — $ — Federal funds sold 38,900 38,900 38,900 — — Certificates of deposit investments 14,643 14,651 — 14,651 — Available-for-sale securities 619,848 619,848 144 618,052 1,652 Held-to-maturity securities 74,231 73,096 — 73,096 — Loans held for sale 1,175 1,175 — 1,175 — Loans net of allowance for loan losses 1,808,064 1,795,764 — — 1,795,764 Interest receivable 10,553 10,553 — 10,553 — Federal Reserve Bank stock 3,949 3,949 — 3,949 — Federal Home Loan Bank stock 4,389 4,389 — 4,389 — Financial Liabilities Deposits 2,329,887 2,331,725 — 1,976,806 354,919 Securities sold under agreements to repurchase 185,763 185,766 — 185,766 — Interest payable 535 535 — 535 — Federal Home Loan Bank borrowings 40,094 40,318 — 40,318 — Other borrowings 18,063 18,063 — 18,063 — Junior subordinated debentures 23,917 17,068 — 17,068 —

Stock Incentive Plan (Tables)

Stock Incentive Plan (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation cost, net of forfeitures, related to stock-based compensation	The following table summarizes the compensation cost, net of forfeitures, related to stock-based compensation for the years ended December 31, 2017, 2016 and 2015 (in thousands): 2017 2016 2015 Stock and stock unit awards: Pre-tax compensation expense $ 954 $ 384 $ 378 Income tax benefit (334 ) (134 ) (132 ) Total share-based compensation expense, net of income taxes $ 620 $ 250 $ 246
Summary of option activity	A summary of option activity under the SI Plan and the 1997 Stock Incentive Plan as of December 31, 2017, 2016 and 2015 , and changes during the years then ended is presented below: 2017 Shares Weighted-Average Weighted-Average Aggregate Outstanding, beginning of year 40,500 $24.65 Granted 0 0.00 Exercised (27,500) 25.42 Forfeited or expired (2,500) 23.00 Outstanding, end of year 10,500 $23.00 0.96 $ 163,170 Exercisable, end of year 10,500 $23.00 0.96 $ 163,170 The total intrinsic value of options exercised during 2017 was $259,000 . There were no stock options for shares of common stock not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2017 because they were anti-dilutive. 2016 Shares Weighted-Average Weighted-Average Aggregate Outstanding, beginning of year 45,500 $24.67 Granted 0 0.00 Exercised (2,500) 24.86 Forfeited or expired (2,500) 24.86 Outstanding, end of year 40,500 $24.65 1.42 $ 378,850 Exercisable, end of year 40,500 $24.65 1.42 $ 378,850 The total intrinsic value of options exercised during 2016 was $14,000 . There were no stock options for shares of common stock not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2016 because they were anti-dilutive. 2015 Shares Weighted-Average Weighted-Average Aggregate Outstanding, beginning of year 52,000 $24.64 Granted 0 0.00 Exercised 0 0.00 Forfeited or expired (6,500) 24.43 Outstanding, end of year 45,500 $24.67 2.42 $ 63,000 Exercisable, end of year 45,500 $24.67 2.42 $ 63,000
Stock options, by exercise price range	The following table summarizes information about stock options under the SI Plan outstanding at December 31, 2017 : Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted-Average Remaining Contractual Life Weighted-Average Exercise Price Number Exercisable Weighted-Average Exercise Price $22.50 to $24.50 10,500 0.96 $23.00 10,500 $23.00
Schedule of Unvested Restricted Stock and Restricted Stock Units Roll Forward [Table Text Block]	The following table summarizes non-vested stock and stock unit activity for the years ended December 31, 2017, 2016 and 2015 : 2017 2016 2015 Shares Weighted-avg Grant-date Fair Value Shares Weighted-avg Grant-date Fair Value Shares Weighted-avg Grant-date Fair Value Nonvested, beginning of year 32,338 $22.64 30,169 $20.87 26,897 $22.95 Granted 18,391 30.65 13,912 26.09 18,002 20.14 Vested (50,729) 25.54 (11,743) 22.18 (14,730) 23.77 Forfeited 0 0.00 0 0.00 0 0.00 Nonvested, end of year 0 $0.00 32,338 $22.64 30,169 $20.87 Fair value of shares vested $ 260,483 $ 260,483 $ 350,075

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of federal and state income tax expense (benefit)	The components of federal and state income tax expense for the years ended December 31, 2017, 2016 and 2015 were as follows (in thousands): 2017 2016 2015 Current Federal $ 9,825 $ 11,375 $ 7,357 State 2,719 2,953 1,841 Total Current 12,544 14,328 9,198 Deferred Federal 2,047 (1,940 ) (84 ) State 451 (448 ) 104 Total Deferred 2,498 (2,388 ) 20 Total $ 15,042 $ 11,940 $ 9,218
Effective income tax rate reconciliation	The principal reasons for the difference are as follows (in thousands): 2017 2016 2015 Expected income taxes $ 14,604 $ 11,823 $ 9,006 Effects of: Tax-exempt income from bank owned life insurance (573 ) (235 ) — Other tax exempt income (2,223 ) (1,577 ) (1,103 ) Nondeductible interest expense 28 21 11 State taxes, net of federal taxes 2,062 1,628 1,264 Other items (266 ) 280 41 Adjustment of deferred tax assets and liabilities for enacted change in tax laws 1,410 — — Effect of marginal tax rate — — (1 ) Total $ 15,042 $ 11,940 $ 9,218
Deferred tax assets and deferred tax liabilities	The tax effects of the temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2017 and 2016 are presented below (in thousands): 2017 2016 Deferred tax assets: Allowance for loan losses $ 5,694 $ 6,599 Available-for-sale investment securities 941 3,680 Deferred compensation 749 1,030 Supplemental retirement 170 259 Core deposit premium and other intangible assets 664 691 Pass thru activities 126 — Other-than-temporary impairment on securities 317 438 Stock Compensation Expense — 194 Deferred Revenue — 101 Purchase Accounting 475 1,791 Acquisition Costs 210 319 Other 596 966 Total gross deferred tax assets 9,942 16,068 Deferred tax liabilities: Deferred loan costs 26 178 Intangibles amortization 3,685 4,467 Prepaid expenses 232 383 FHLB stock dividend 158 380 Depreciation 1,207 740 Deferred Revenue 58 — Accumulated accretion 112 72 Mortgage servicing rights 240 387 Total gross deferred tax liabilities 5,718 6,607 Net deferred tax assets $ 4,224 $ 9,461

Commitments and Contingent Li45

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Off-balance sheet financial instruments whose contract amounts represent credit risk	The off-balance sheet financial instruments whose contract amounts represent credit risk at December 31, 2017 and 2016 were as follows (in thousands): 2017 2016 Unused commitments and lines of credit: Commercial real estate $ 73,268 $ 128,576 Commercial operating 223,960 236,182 Home equity 38,318 40,896 Other 69,333 70,092 Total $ 404,879 $ 475,746 Standby letters of credit $ 10,626 $ 9,339

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related party transactions	Activity during 2017 and 2016 was as follows (in thousands): 2017 2016 Beginning balance $ 54,502 $ 56,045 New loans 29,725 5,450 Loan repayments (7,392 ) (6,993 ) Ending balance $ 76,835 $ 54,502

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The purchase was accounted for under the acquisition method in accordance with Accounting Standards Codification (“ASC”) 805, “Business Combinations,” and accordingly the assets and liabilities were recorded at their fair values on the date of acquisition. The following table summarizes the estimated fair values of assets acquired and liabilities assumed at the date of acquisition (in thousands). Acquired Book Value Fair Value Adjustments As Recorded by First Mid Bank Assets Cash 279,468 — 279,468 Loans 155,774 (3,377 ) 152,397 Premises and equipment 4,547 (125 ) 4,422 Goodwill — 14,274 14,274 Core deposit intangible — 6,216 6,216 Other assets 1,433 (259 ) 1,174 Total assets acquired $ 441,222 $ 16,729 457,951 Liabilities Deposits 452,810 837 453,647 Securities sold under agreements to repurchase 3,797 — 3,797 Other liabilities 507 — 507 Total liabilities assumed 457,114 837 457,951
Business Acquisition, Pro Forma Information [Table Text Block]	The following unaudited pro forma condensed combined financial information presents the results of operations of the Company, including the effects of the purchase accounting adjustments and acquisition expenses, had the acquisition taken place at the beginning of the period (in thousands): Twelve months ended December 31, 2015 Net interest income 66,680 Provision for loan losses 1,483 Non-interest income 26,001 Non-interest expense 59,944 Income before income taxes 31,254 Income tax expense 11,207 Net income 20,047 Dividends on preferred shares 2,200 Net income available to common stockholders $ 17,847 Earnings per share Basic $2.30 Diluted $2.19 Basic weighted average shares outstanding 7,775,490 Diluted weighted average shares outstanding 9,137,689 The unaudited pro forma condensed combined financial statements do not reflect any anticipated cost savings and revenue enhancements. Accordingly, the pro forma results of operations of the Company as of and after the business combination may not be indicative of the results that actually would have occurred if the combination had been in effect during the periods presented or of the results that may be attained in the future.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Future minimum lease payments under operating leases	Future minimum lease payments under operating leases are (in thousands): Operating Leases 2018 $ 2,591 2019 2,099 2020 2,099 2021 1,792 2022 1,793 Thereafter 32,882 Total minimum lease payments $ 43,256

Parent Company Only Financial49

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed balance sheets	First Mid-Illinois Bancshares, Inc. (Parent Company) Balance Sheets December 31, 2017 2016 Assets Cash $ 8,296 $ 2,382 Premises and equipment, net 2,654 2,648 Investment in subsidiaries 328,830 315,752 Other assets 3,555 2,982 Total Assets $ 343,335 $ 323,764 Liabilities and Stockholders’ equity Liabilities Debt 34,313 41,979 Other liabilities 1,058 1,112 Total Liabilities 35,371 43,091 Stockholders’ equity 307,964 280,673 Total Liabilities and Stockholders’ equity $ 343,335 $ 323,764
Condensed statements of income	First Mid-Illinois Bancshares, Inc. (Parent Company) Statements of Income and Comprehensive Income Years ended December 31, 2017 2016 2015 Income: Dividends from subsidiaries $ 18,925 $ 19,475 $ 6,094 Other income 1,227 66 66 Total income 20,152 19,541 6,160 Operating expenses 3,902 3,491 2,556 Income before income taxes and equity in undistributed earnings of subsidiaries 16,250 16,050 3,604 Income tax benefit 864 1,073 974 Income before equity in undistributed earnings of subsidiaries 17,114 17,123 4,578 Equity in undistributed earnings of subsidiaries 9,570 4,717 11,934 Net income 26,684 21,840 16,512 Other comprehensive income (loss), net of taxes 3,525 (6,484 ) 1,598 Comprehensive income $ 30,209 $ 15,356 $ 18,110
Condensed statements of cash flows	First Mid-Illinois Bancshares, Inc. (Parent Company) Statements of Cash Flows Years ended December 31, 2017 2016 2015 Cash flows from operating activities: Net income $ 26,684 $ 21,840 $ 16,512 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, amortization, accretion, net 82 87 87 Dividends received from subsidiary 18,925 19,475 6,094 Equity in undistributed earnings of subsidiaries (9,570 ) (4,717 ) (11,934 ) Increase in other assets (19,348 ) (111,379 ) (4,707 ) Increase in other liabilities 733 153 37 Net cash provided by (used in) operating activities 17,506 (74,541 ) 6,089 Cash flows from investing activities: Investment in subsidiary — (5,000 ) (27,825 ) Net cash from business acquisition — 68,798 — Net cash provided by (used in) investing activities — 63,798 (27,825 ) Cash flows from financing activities: Repayment of short-term debt (4,000 ) (3,000 ) — Proceeds from short-term debt — 7,000 — Repayment of long-term debt (3,750 ) (938 ) — Proceeds from long-term debt — 15,000 — Proceeds from issuance of common stock 4,399 195 28,222 Direct expense related to capital transactions (216 ) (229 ) — Purchase of treasury stock (797 ) — (1,066 ) Dividends paid on preferred stock — (1,286 ) (2,002 ) Dividends paid on common stock (7,228 ) (5,277 ) (3,487 ) Net cash provided by (used in) financing activities (11,592 ) 11,465 21,667 Increase (decrease) in cash 5,914 722 (69 ) Cash at beginning of year 2,382 1,660 1,729 Cash at end of year $ 8,296 $ 2,382 $ 1,660

Quarterly Financial Data -- U50

Quarterly Financial Data -- Unaudited (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Quarterly financial data - unaudited	The following table presents summarized quarterly data for each of the two years ended December 31, 2017 and 2016 (in thousands): Quarters ended in 2017 March 31 June 30 September 30 December 31 Selected operations data: Interest income $ 24,182 $ 25,446 $ 24,614 $ 25,313 Interest expense 1,410 1,493 1,741 1,838 Net interest income 22,772 23,953 22,873 23,475 Provision for loan losses 1,722 1,840 1,489 2,411 Net interest income after provision for loan losses 21,050 22,113 21,384 21,064 Other income 7,496 7,969 7,661 7,210 Other expense 19,202 17,955 17,912 19,152 Income before income taxes 9,344 12,127 11,133 9,122 Income taxes 3,080 3,927 3,538 4,497 Net income available to common stockholders $ 6,264 $ 8,200 $ 7,595 $ 4,625 Basic earnings per common share $0.50 $0.66 $0.61 $0.37 Diluted earnings per common share 0.50 0.66 0.61 0.37 Quarters ended in 2016 March 31 June 30 September 30 December 31 Selected operations data: Interest income $ 16,979 $ 16,883 $ 18,623 $ 23,011 Interest expense 892 913 1,000 1,487 Net interest income 16,087 15,970 17,623 21,524 Provision for loan losses 113 733 1,081 899 Net interest income after provision for loan losses 15,974 15,237 16,542 20,625 Other income 6,644 6,459 6,898 6,911 Other expense 15,171 14,143 15,320 16,876 Income before income taxes 7,447 7,553 8,120 10,660 Income taxes 2,641 2,624 2,812 3,863 Net income 4,806 4,929 5,308 6,797 Dividends on preferred shares 550 275 — — Net income available to common stockholders $ 4,256 $ 4,654 $ 5,308 $ 6,797 Basic earnings per common share $ 0.50 $ 0.51 $ 0.51 $ 0.55 Diluted earnings per common share 0.49 0.50 0.51 0.55

Summary of Significant Accoun51

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (PP&E)	12 Months Ended
	Dec. 31, 2017
Buildings and improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Buildings and improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Leasehold improvements | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Leasehold improvements | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Furniture and equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and equipment | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years

Summary of Significant Accoun52

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Trust Assets) $ in Thousands	Dec. 31, 2017USD ($)trust_accounts	Dec. 31, 2016USD ($)trust_accounts
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Trust Accounts managed or administered | trust_accounts	1,119	1,231
Value of Trust Accounts | $	$ 997,790	$ 831,600

Summary of Significant Accoun53

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (SIP) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares to be issued in stock incentive plan (in shares)	149,983
Options, Grants in Period, Gross	0	0	0
RSA/RSU, Grants in Period, Gross	18,391	13,912	18,002
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Grants in Period, Gross				59,500
Stock Unit Awards and Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSA/RSU, Grants in Period, Gross			18,002
Stock Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSA/RSU, Grants in Period, Gross	18,391	13,912

Summary of Significant Accoun54

Summary of Significant Accounting Policies (AOCI) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income (loss), net of tax	$ (2,304)	$ (5,761)
Realized gains on available-for-sale securities	616	1,192	$ 452
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax	(216)	(465)	(176)
Total reclassifications out of accumulated other comprehensive income	400	727	$ 276
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized losses on securities available-for-sale	(2,619)	(7,649)
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	281	393
Securities with other-than-temporary impairment losses	(345)	(1,398)
Tax benefit	841	3,134
Other Than Temporary Impairment Losses Investments Portion In Accumulated Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest Available For Sale Securities	(100)	(545)
Other Comprehensive Income (Loss), Tax	941	3,679
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2,059)	(4,908)
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities	$ 245	$ 853

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($)	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
Basic Net Income per Common Share Available to Common Stockholders [Abstract]
Net income					$ 6,797,000	$ 5,308,000	$ 4,929,000	$ 4,806,000	$ 26,684,000	$ 21,840,000	$ 16,512,000
Preferred stock dividends									0	(825,000)	(2,200,000)
Net income available to common stockholders	$ 4,625,000	$ 7,595,000	$ 8,200,000	$ 6,264,000	$ 6,797,000	$ 5,308,000	$ 4,654,000	$ 4,256,000	$ 26,684,000	$ 21,015,000	$ 14,312,000
Weighted average common shares outstanding									12,531,659	10,149,099	7,775,490
Basic earnings per common share	$ 0.37	$ 0.61	$ 0.66	$ 0.50	$ 0.55	$ 0.51	$ 0.51	$ 0.50	$ 2.13	$ 2.07	$ 1.84
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]
Net income available to common stockholders	$ 4,625,000	$ 7,595,000	$ 8,200,000	$ 6,264,000	$ 6,797,000	$ 5,308,000	$ 4,654,000	$ 4,256,000	$ 26,684,000	$ 21,015,000	$ 14,312,000
Effect of assumed preferred stock conversion									0	825,000	2,200,000
Net income applicable to diluted earnings per share									$ 26,684,000	$ 21,840,000	$ 16,512,000
Weighted average common shares outstanding									12,531,659	10,149,099	7,775,490
Dilutive potential common shares [Abstract]
Assumed conversion of stock options									4,875	3,111	0
Restricted stock awarded									0	4,107	6,851
Assumed conversion of preferred stock									0	507,393	1,355,348
Dilutive potential common shares									4,875	514,611	1,362,199
Diluted weighted average common shares outstanding									12,536,534	10,663,710	9,137,689
Diluted earnings per common share	$ 0.37	$ 0.61	$ 0.66	$ 0.50	$ 0.55	$ 0.51	$ 0.50	$ 0.49	$ 2.13	$ 2.05	$ 1.81
Stock options to purchase shares of common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)									0	0	45,500

Cash and Due from Banks Cash an

Cash and Due from Banks Cash and Due from Banks (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Line Items]
Restricted Cash and Cash Equivalents, Current	$ 8,944	$ 16,643	$ 8,175

Investment Securities (Details)

Investment Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)securities	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Available-for-sale: [Abstract]
Amortized Cost	$ 581,543	$ 628,895
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,900	2,037
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(5,864)	(11,084)
Fair Value	578,579	619,848
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities	69,332	74,231
Held-to-maturity Securities, Fair Value	68,457	73,096
Realized Investment Gains (Losses) [Abstract]
Proceeds from sales	159,663	70,757	$ 19,380
Gross gains	773	1,192	452
Gross losses	(157)	0	0
Income tax expense	216	465	$ 176
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	115,796	138,819
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	8	13
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(2,034)	(2,508)
Fair Value	113,770	136,324
Held-to-maturity Securities [Abstract]
Held-to-maturity Securities	69,332	74,231
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	103	203
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(978)	(1,338)
Held-to-maturity Securities, Fair Value	68,457	73,096
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	165,037	164,163
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,254	1,346
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1,025)	(2,804)
Fair Value	166,266	162,705
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	295,778	318,829
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	493	531
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(2,460)	(4,369)
Fair Value	293,811	314,991
Trust preferred securities
Available-for-sale: [Abstract]
Amortized Cost	2,893	3,050
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(345)	(1,398)
Fair Value	$ 2,548	1,652
Held-to-maturity Securities [Abstract]
Number of trust preferred securities | securities	1
Maturities of Debt Securities	twenty
Other securities
Available-for-sale: [Abstract]
Amortized Cost	$ 2,039	4,034
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	145	147
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	(5)
Fair Value	$ 2,184	$ 4,176

Investment Securities, Part II

Investment Securities, Part II (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)securities	Dec. 31, 2017USD ($)securities	Dec. 31, 2016USD ($)securities	Dec. 31, 2015USD ($)
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	$ 87,434,000	$ 87,434,000
After 1 through 5 years	282,827,000	282,827,000
After 5 through 10 years	203,980,000	203,980,000
After ten years	4,338,000	4,338,000
Fair Value	578,579,000	$ 578,579,000	$ 619,848,000
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths)		2.28%
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths)		3.30%
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths)		4.11%
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths)		2.74%
Available-for-sale , Weighted Average Yield, Maturities (in hundredths)		3.42%
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths)		2.67%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths)		3.82%
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths)		4.88%
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths)		3.55%
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths)		4.01%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	39,993,000	$ 39,993,000
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	29,339,000	29,339,000
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0	0
Held-to-maturity, at amortized cost (estimated fair value of $68,457 and $73,096 at December 31, 2017 and 2016, respectively)	69,332,000	$ 69,332,000	74,231,000
Held To Maturity Weighted Average Yield Maturities Year One		1.76%
Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years		2.08%
Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years		0.00%
Held To Maturity Weighted Average Yield Maturities After 10 Years		0.00%
Held To Maturity Weighted Average Yield Maturities		1.90%
Held To Maturity Tax Equivalent Yield Maturities Year One		1.76%
Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years		2.08%
Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years		0.00%
Held To Maturity Tax Equivalent Yield Maturities After 10 Years		0.00%
Held To Maturity Tax Equivalent Yield Maturities		1.90%
Tax rate used to calculate tax-equivalent yields (in hundredths)		35.00%
Percentage investment book value exceeds total stockholders' equity (in hundredths)		10.00%
Investment Securities Pledged as Collateral	479,398,000	$ 479,398,000	509,296,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	289,151,000	289,151,000	484,981,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,251,000)	(3,251,000)	(9,411,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	82,396,000	82,396,000	9,525,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,613,000)	(2,613,000)	(1,673,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	371,547,000	371,547,000	494,506,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (5,864,000)	(5,864,000)	(11,084,000)
Details of Trust Preferred Securities [Abstract]
Coupon Rate of Trust Preferred Security	floating rate coupon of 3-month LIBOR plus 90 basis points
Number of Ratios Utilized in OTTI Credit Model	29
OTTI Cash Flow Initial Default Rate	2.00%
Period For Initial Default Rate Used In OTTI Analysis	two years
Default Rate Applied For Remainder Of OTTI Analysis	36 basis points
Recovery Rate Used In OTTI Cash Flow Analysis	10.00%
Credit losses on trust preferred securities held [Abstract]
Beginning of period		1,111,000	1,111,000	$ 1,111,000
Additions related to OTTI losses not previously recognized		0	0	0
Reductions due to sales / (recoveries)		0	0	0
Reductions due to change in intent or likelihood of sale		0	0	0
Additions related to increases in previously recognized OTTI losses		0	0	0
Reductions due to increases in expected cash flows		0	0	0
End of period	$ 1,111,000	1,111,000	1,111,000	$ 1,111,000
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	39,105,000	39,105,000
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	29,352,000	29,352,000
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	0	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	0	0
Held-to-maturity Securities, Fair Value	68,457,000	68,457,000	73,096,000
PreTSL XXVIII
Details of Trust Preferred Securities [Abstract]
Book Value	2,893,000	2,893,000
Market Value	2,548,000	2,548,000
Unrealized Gains (Losses)	(345,000)	(345,000)
Other-than- temporary Impairment Recorded To-date		(1,111,000)
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	70,462,000	70,462,000
After 1 through 5 years	38,359,000	38,359,000
After 5 through 10 years	4,949,000	4,949,000
After ten years	0	0
Fair Value	113,770,000	113,770,000	136,324,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	39,993,000	39,993,000
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	29,339,000	29,339,000
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0	0
Held-to-maturity, at amortized cost (estimated fair value of $68,457 and $73,096 at December 31, 2017 and 2016, respectively)	69,332,000	69,332,000	74,231,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	58,584,000	58,584,000	125,257,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(540,000)	(540,000)	(2,508,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	47,972,000	47,972,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,494,000)	(1,494,000)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	106,556,000	106,556,000	125,257,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2,034,000)	$ (2,034,000)	(2,508,000)
Number of AFS securities in Unrealized Loss Positions | securities	11	11
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 34,101,000	$ 34,101,000	53,295,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(525,000)	(525,000)	(1,338,000)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14,540,000	14,540,000	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(453,000)	(453,000)	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	48,641,000	48,641,000	53,295,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (978,000)	$ (978,000)	(1,338,000)
Number of HTM securities in Unrealized Loss Positions | securities	7	7
Credit losses on trust preferred securities held [Abstract]
Held-to-maturity Securities, Fair Value	$ 68,457,000	$ 68,457,000	73,096,000
Obligations of states and political subdivisions
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	16,897,000	16,897,000
After 1 through 5 years	74,454,000	74,454,000
After 5 through 10 years	73,297,000	73,297,000
After ten years	1,618,000	1,618,000
Fair Value	166,266,000	166,266,000	162,705,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	42,618,000	42,618,000	93,405,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(769,000)	(769,000)	(2,804,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	9,267,000	9,267,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(256,000)	(256,000)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	51,885,000	51,885,000	93,405,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,025,000)	$ (1,025,000)	(2,804,000)
Number of AFS securities in Unrealized Loss Positions | securities	39	39
Mortgage-backed securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	$ 75,000	$ 75,000
After 1 through 5 years	168,002,000	168,002,000
After 5 through 10 years	125,734,000	125,734,000
After ten years	0	0
Fair Value	293,811,000	293,811,000	314,991,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	187,949,000	187,949,000	266,319,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,942,000)	(1,942,000)	(4,099,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	22,609,000	22,609,000	5,878,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(518,000)	(518,000)	(270,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	210,558,000	210,558,000	272,197,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2,460,000)	$ (2,460,000)	$ (4,369,000)
Number of AFS securities in Unrealized Loss Positions | securities	26	26	2
Trust preferred securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	$ 0	$ 0
After 1 through 5 years	0	0
After 5 through 10 years	0	0
After ten years	2,548,000	2,548,000
Fair Value	2,548,000	2,548,000	$ 1,652,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	2,548,000	2,548,000	1,652,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(345,000)	(345,000)	(1,398,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,548,000	2,548,000	1,652,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (345,000)	$ (345,000)	$ (1,398,000)
Number of AFS securities in Unrealized Loss Positions | securities	1	1	1
Other securities
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
One year or less	$ 0	$ 0
After 1 through 5 years	2,012,000	2,012,000
After 5 through 10 years	0	0
After ten years	172,000	172,000
Fair Value	2,184,000	2,184,000	$ 4,176,000
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	0	1,995,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0	(5,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0	1,995,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 0	$ (5,000)
Number of AFS securities in Unrealized Loss Positions | securities			1

Investment Securities Investmen

Investment Securities Investment Securities, Part III (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 88,726
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	114,719
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	77,765
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	4,555
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	285,765
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	581,543
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	295,778
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value	87,358
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value	114,825
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value	78,246
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value	4,339
Available-for-sale Securities, Debt Maturities, Single Maturity Date	284,768
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	293,811
Fair Value	578,579	$ 619,848
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	39,993
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	29,339
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0
Held-to-maturity, at amortized cost (estimated fair value of $68,457 and $73,096 at December 31, 2017 and 2016, respectively)	69,332	74,231
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	39,105
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	29,352
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	0
Held-to-maturity Securities, Fair Value	$ 68,457	$ 73,096

Loans and Allowance for Loan 60

Loans and Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,946,114	$ 1,836,251
Loans Receivable Held-for-sale, Amount	1,025	1,175
loans and leases receivable gross excluding loans held for sale	1,945,089	1,835,076
Net deferred loan fees, premiums and discounts	(6,613)	(10,259)
Allowance for loan losses	19,977	16,753	$ 14,576	$ 13,682
Net loans	1,918,499	1,808,064
Loans held for sale	1,025	1,175
Increase (Decrease) in Accounts and Notes Receivable	110,400
Loans Receivable, Net	1,939,501	1,825,992
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	107,721	49,366
Loans Receivable, Net	107,594	49,104
Farm loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	127,232	126,216
Loans Receivable, Net	127,183	126,108
1-4 Family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	294,483	328,119
Loans Receivable, Net	293,667	326,415
Multifamily residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	61,966	83,478
Loans Receivable, Net	61,798	83,200
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	684,639	633,694
Loans Receivable, Net	$ 681,757	630,135
Debt coverage ratio	1.20x
Amortization period of loans	twenty years
Commercial real estate | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan To Value Ratio	65.00%
Commercial real estate | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan To Value Ratio	80.00%
Loans secured by real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 1,276,041	1,220,873
Loans Receivable, Net	1,271,999	1,214,962
Agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	86,602	86,735
Loans Receivable, Net	86,631	86,685
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	445,378	412,637
Loans Receivable, Net	$ 444,263	409,033
Loan To Value Ratio	80.00%
Amortization period of loans	seven years
Loans Receivable, Time Period	one year
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 30,070	38,404
Allowance for loan losses	803	693	642	386
Loans Receivable, Net	29,749	38,028
All other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	108,023	77,602
Loans Receivable, Net	106,859	77,284
Agricultural and Farm Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	213,834	212,800
Increase (Decrease) in Accounts and Notes Receivable	$ 1,034
Loan To Value Ratio	65.00%
Amortization period of loans	twenty five years
Loans Receivable, Time Period	one year
Other Grain Farming [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 170,800	171,336
Increase (Decrease) in Accounts and Notes Receivable	(500)
Motels and Hotels Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,702
Non-residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	185,967
Residential Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,756
Other Gambling Industries [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	95,713
Commercial/Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	16,546	12,901	11,379	10,914
Agriculture/Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,742	2,249	1,337	1,360
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 886	874	994	790
Loan To Value Ratio	80.00%
Amortization period of loans	twenty five years
Balloon period	five years
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 36	$ 224	$ 232

Loans and Allowance for Loan 61

Loans and Allowance for Loan Losses, Part II (Details)		12 Months Ended
		Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 1,939,501,000	$ 1,825,992,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		10,919,000	8,185,000
Current		1,928,582,000	1,817,807,000
Total Loans Greater than 90 Days Past Due and Still Accruing		$ 0	105,000
Number of days past due when interest is not accrued		ninety days
Period of satisfactory performance before returning to accrual status		six months
Loans with a specific allowance [Abstract]
Recorded Balance		$ 13,345,000	5,266,000
Unpaid Principal Balance		14,747,000	5,385,000
Specific Allowance		623,000	858,000
Loans without a specific allowance [Abstract]
Recorded Balance		4,168,000	12,972,000
Unpaid Principal Balance		4,470,000	14,612,000
Total Loans [Abstract]
Recorded Balance		17,513,000	18,238,000
Unpaid Principal Balance		19,217,000	19,997,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		17,183,000	17,359,000	$ 4,712,000
Interest income recognized		51,000	119,000	28,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		16,659,000	12,053,000
Interest Lost on Nonaccrual Loans		471,000,000	133,000,000	48,000,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		8,898,000	10,889,000
Troubled Debt Restructuring, Allowance		37,000	196,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		8,898,000	10,889,000
Financing Receivable Modifications Performing Recorded Investment		854,000	6,185,000
Financing Receivables, Modifications during Period, Balance		$ 6,691,000	$ 1,380,000
Financing Receivables, Modifications during Period, Number		13	13
Subsequent Default, Number of Days Past Due		ninety days
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		1	1
Other real estate owned		$ 2,754,000	$ 1,982,000
Mortgage Loans Secured By Real Estate In Foreclosure		404,000	661,000
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		1,860,539,000	1,769,460,000
Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		42,675,000	27,653,000
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		36,287,000	28,879,000
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		107,594,000	49,104,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		74,000	0
Current		107,520,000	49,104,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		0	227,000
Unpaid Principal Balance		0	227,000
Specific Allowance		0	0
Loans without a specific allowance [Abstract]
Recorded Balance		0	0
Unpaid Principal Balance		0	0
Total Loans [Abstract]
Recorded Balance		0	227,000
Unpaid Principal Balance		0	227,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		0	229,000	142,000
Interest income recognized		0	0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		0	227,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		0	227,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		0	227,000
Financing Receivables, Modifications during Period, Balance		$ 0	$ 227,000
Financing Receivables, Modifications during Period, Number	[1]	0	1
Construction and land development | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 107,140,000	$ 48,877,000
Construction and land development | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		454,000	0
Construction and land development | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	227,000
Construction and land development | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Farm loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		127,183,000	126,108,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		396,000	424,000
Current		126,787,000	125,684,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		276,000	0
Unpaid Principal Balance		276,000	0
Specific Allowance		0	0
Loans without a specific allowance [Abstract]
Recorded Balance		15,000	205,000
Unpaid Principal Balance		15,000	207,000
Total Loans [Abstract]
Recorded Balance		291,000	205,000
Unpaid Principal Balance		291,000	207,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		293,000	207,000	527,000
Interest income recognized		0	0	2,000
Loans Receivable, Modifications, Still Accruing Interest		0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		291,000	205,000
Farm loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		120,767,000	118,934,000
Farm loans | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		4,829,000	5,190,000
Farm loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		1,587,000	1,984,000
Farm loans | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
1-4 Family residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		293,667,000	326,415,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		5,328,000	3,575,000
Current		288,339,000	322,840,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	105,000
Loans with a specific allowance [Abstract]
Recorded Balance		1,026,000	997,000
Unpaid Principal Balance		1,347,000	997,000
Specific Allowance		25,000	6,000
Loans without a specific allowance [Abstract]
Recorded Balance		2,239,000	2,497,000
Unpaid Principal Balance		2,664,000	3,207,000
Total Loans [Abstract]
Recorded Balance		3,265,000	3,494,000
Unpaid Principal Balance		4,011,000	4,204,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		3,267,000	2,988,000	1,440,000
Interest income recognized		29,000	22,000	14,000
Loans Receivable, Modifications, Still Accruing Interest		578,000	603,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		2,687,000	2,890,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		874,000	1,753,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		874,000	1,753,000
Financing Receivable Modifications Performing Recorded Investment		578,000	603,000
Financing Receivables, Modifications during Period, Balance		$ 196,000	$ 176,000
Financing Receivables, Modifications during Period, Number	[1]	3	3
1-4 Family residential properties | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 282,441,000	$ 318,921,000
1-4 Family residential properties | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		2,654,000	918,000
1-4 Family residential properties | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		8,572,000	6,576,000
1-4 Family residential properties | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Multifamily residential properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		61,798,000	83,200,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	240,000
Current		61,798,000	82,960,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		313,000	528,000
Unpaid Principal Balance		313,000	528,000
Specific Allowance		0	0
Loans without a specific allowance [Abstract]
Recorded Balance		55,000	3,419,000
Unpaid Principal Balance		55,000	3,547,000
Total Loans [Abstract]
Recorded Balance		368,000	3,947,000
Unpaid Principal Balance		368,000	4,075,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		377,000	3,824,000	323,000
Interest income recognized		1,000	55,000	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		368,000	528,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		0	3,419,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		0	3,419,000
Financing Receivable Modifications Performing Recorded Investment		0	3,419,000
Multifamily residential properties | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		60,954,000	81,018,000
Multifamily residential properties | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		476,000	1,651,000
Multifamily residential properties | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		368,000	531,000
Multifamily residential properties | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		681,757,000	630,135,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		3,694,000	2,421,000
Current		678,063,000	627,714,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		5,544,000	863,000
Unpaid Principal Balance		5,565,000	884,000
Specific Allowance		531,000	0
Loans without a specific allowance [Abstract]
Recorded Balance		303,000	6,224,000
Unpaid Principal Balance		368,000	6,802,000
Total Loans [Abstract]
Recorded Balance		5,847,000	7,087,000
Unpaid Principal Balance		5,933,000	7,686,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		5,457,000	6,675,000	310,000
Interest income recognized		13,000	36,000	2,000
Loans Receivable, Modifications, Still Accruing Interest		251,000	2,116,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		5,596,000	4,971,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		1,376,000	4,125,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		1,376,000	4,125,000
Financing Receivable Modifications Performing Recorded Investment		251,000	2,116,000
Financing Receivables, Modifications during Period, Balance		$ 814,000	$ 42,000
Financing Receivables, Modifications during Period, Number	[1]	2	1
Commercial real estate | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 647,208,000	$ 610,025,000
Commercial real estate | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		16,941,000	5,229,000
Commercial real estate | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		17,608,000	14,881,000
Commercial real estate | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Loans secured by real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		1,271,999,000	1,214,962,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		9,492,000	6,660,000
Current		1,262,507,000	1,208,302,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	105,000
Loans with a specific allowance [Abstract]
Recorded Balance		7,159,000	2,615,000
Unpaid Principal Balance		7,501,000	2,636,000
Specific Allowance		556,000	6,000
Loans without a specific allowance [Abstract]
Recorded Balance		2,612,000	12,345,000
Unpaid Principal Balance		3,102,000	13,763,000
Total Loans [Abstract]
Recorded Balance		9,771,000	14,960,000
Unpaid Principal Balance		10,603,000	16,399,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		9,394,000	13,923,000	2,742,000
Interest income recognized		43,000	113,000	18,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		8,942,000	8,821,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		2,250,000	9,524,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		2,250,000	9,524,000
Financing Receivable Modifications Performing Recorded Investment		829,000	6,138,000
Financing Receivables, Modifications during Period, Balance		$ 1,010,000	$ 445,000
Financing Receivables, Modifications during Period, Number		5	5
Agricultural loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 86,631,000	$ 86,685,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		190,000	486,000
Current		86,441,000	86,199,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		212,000	1,345,000
Unpaid Principal Balance		1,009,000	1,345,000
Specific Allowance		2,000	660,000
Loans without a specific allowance [Abstract]
Recorded Balance		545,000	43,000
Unpaid Principal Balance		0	66,000
Total Loans [Abstract]
Recorded Balance		757,000	1,388,000
Unpaid Principal Balance		1,009,000	1,411,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		878,000	1,394,000	82,000
Interest income recognized		0	0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		757,000	1,388,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		757,000	0
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		757,000	0
Financing Receivables, Modifications during Period, Balance		$ 757,000
Financing Receivables, Modifications during Period, Number	[1]	4
Agricultural loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 83,469,000	81,922,000
Agricultural loans | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		2,304,000	3,271,000
Agricultural loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		858,000	1,492,000
Agricultural loans | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		444,263,000	409,033,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		965,000	799,000
Current		443,298,000	408,234,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		5,774,000	1,093,000
Unpaid Principal Balance		6,037,000	1,191,000
Specific Allowance		64,000	192,000
Loans without a specific allowance [Abstract]
Recorded Balance		909,000	378,000
Unpaid Principal Balance		1,249,000	572,000
Total Loans [Abstract]
Recorded Balance		6,683,000	1,471,000
Unpaid Principal Balance		7,286,000	1,763,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		6,586,000	1,485,000	1,569,000
Interest income recognized		8,000	4,000	8,000
Loans Receivable, Modifications, Still Accruing Interest		25,000	41,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		6,658,000	1,430,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		5,690,000	1,040,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		5,690,000	1,040,000
Financing Receivable Modifications Performing Recorded Investment		25,000	41,000
Financing Receivables, Modifications during Period, Balance		$ 4,924,000	$ 916,000
Financing Receivables, Modifications during Period, Number	[1]	4	7
Commercial and industrial loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 425,846,000	$ 397,762,000
Commercial and industrial loans | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		11,492,000	8,485,000
Commercial and industrial loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		6,925,000	2,786,000
Commercial and industrial loans | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		29,749,000	38,028,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		272,000	240,000
Current		29,477,000	37,788,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		200,000	213,000
Unpaid Principal Balance		200,000	213,000
Specific Allowance		1,000	0
Loans without a specific allowance [Abstract]
Recorded Balance		102,000	206,000
Unpaid Principal Balance		119,000	211,000
Total Loans [Abstract]
Recorded Balance		302,000	419,000
Unpaid Principal Balance		319,000	424,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		325,000	557,000	319,000
Interest income recognized		0	2,000	2,000
Loans Receivable, Modifications, Still Accruing Interest			6,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		302,000	414,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance		201,000	325,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance		201,000	325,000
Financing Receivable Modifications Performing Recorded Investment		0	6,000
Financing Receivables, Modifications during Period, Balance		$ 0	$ 19,000
Financing Receivables, Modifications during Period, Number	[1]	0	1
Consumer loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		$ 29,375,000	$ 37,624,000
Consumer loans | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		5,000	17,000
Consumer loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		369,000	387,000
Consumer loans | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
All other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		106,859,000	77,284,000
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Current		106,859,000	77,284,000
Total Loans Greater than 90 Days Past Due and Still Accruing		0	0
Loans with a specific allowance [Abstract]
Recorded Balance		0	0
Unpaid Principal Balance		0	0
Specific Allowance		0	0
Loans without a specific allowance [Abstract]
Recorded Balance		0	0
Unpaid Principal Balance		0	0
Total Loans [Abstract]
Recorded Balance		0	0
Unpaid Principal Balance		0	0
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans		0	0	0
Interest income recognized		0	0	$ 0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans		0	0
All other loans | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		103,339,000	74,377,000
All other loans | Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		3,520,000	2,892,000
All other loans | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	15,000
All other loans | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable, Net		0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans Receivable Aging Analysis [Abstract]
Total Past Due		3,509,000	4,468,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due		26,000	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Farm loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due		3,023,000	1,854,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due		90,000	1,662,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due		3,139,000	3,516,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	365,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		192,000	395,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		178,000	192,000
Financing Receivables, 30 to 59 Days Past Due [Member] | All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans Receivable Aging Analysis [Abstract]
Total Past Due		726,000	1,836,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due		48,000	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Farm loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	131,000
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due		538,000	713,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due		38,000	716,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due		624,000	1,560,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		32,000	84,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		3,000	155,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		67,000	37,000
Financing Receivables, 60 to 89 Days Past Due [Member] | All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans Receivable Aging Analysis [Abstract]
Total Past Due		6,684,000	1,881,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Farm loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		396,000	293,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due		1,767,000	1,008,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due		0	240,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due		3,566,000	43,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due		5,729,000	1,584,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		158,000	37,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		770,000	249,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		27,000	11,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due		$ 0	$ 0
[1]	Type of modifications:(a) Reduction of stated interest rate of loan(b) Change in payment terms(c) Extension of maturity date(d) Permanent reduction of the recorded investment

Loans and Allowance for Loan 62

Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Allowance (Details)	12 Months Ended
	Dec. 31, 2017USD ($)alternative	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 08, 2016USD ($)
Financing Receivable, Impaired [Line Items]
Minimum balance of adversely classified loan in which a detailed analysis is performed	$ 250,000
Number of alternatives for measuring impaired loans receivable | alternative	3
Balance, beginning of year	$ 16,753,000	$ 14,576,000	$ 13,682,000
Provision for loan losses	7,462,000	2,826,000	1,318,000
Losses charged off	(5,195,000)	(1,675,000)	(906,000)
Recoveries	957,000	1,026,000	482,000
Balance, end of period	19,977,000	16,753,000	14,576,000
Individually evaluated for impairment	614,000	858,000	134,000
Collectively evaluated for impairment	19,354,000	15,881,000	14,442,000
Ending balance	1,939,501,000	1,825,992,000	1,281,889,000
Individually evaluated for impairment	13,086,000	5,266,000	1,174,000
Collectively evaluated for impairment	$ 1,926,156,000	1,812,640,000	1,280,715,000
Financing Receivable, Net				$ 8,688,000
Unsecured Open-end Loans [Member]
Financing Receivable, Impaired [Line Items]
Period When Loans Are Charged Down	180 days
Other Secured Loans [Member]
Financing Receivable, Impaired [Line Items]
Period When Loans Are Charged Down	120 days
Commercial/Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Balance, beginning of year	$ 12,901,000	11,379,000	10,914,000
Provision for loan losses	6,884,000	1,467,000	451,000
Losses charged off	(3,795,000)	(747,000)	(289,000)
Recoveries	556,000	802,000	303,000
Balance, end of period	16,546,000	12,901,000	11,379,000
Individually evaluated for impairment	586,000	192,000	134,000
Collectively evaluated for impairment	15,951,000	12,695,000	11,245,000
Ending balance	1,371,787,000	1,204,799,000	807,736,000
Individually evaluated for impairment	11,372,000	1,956,000	744,000
Collectively evaluated for impairment	1,360,156,000	1,199,003,000	806,992,000
Agriculture/Agricultural Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Balance, beginning of year	2,249,000	1,337,000	1,360,000
Provision for loan losses	153,000	933,000	(25,000)
Losses charged off	(662,000)	(30,000)	0
Recoveries	2,000	9,000	2,000
Balance, end of period	1,742,000	2,249,000	1,337,000
Individually evaluated for impairment	2,000	660,000	0
Collectively evaluated for impairment	1,740,000	1,589,000	1,337,000
Ending balance	213,521,000	212,513,000	198,066,000
Individually evaluated for impairment	488,000	1,345,000	430,000
Collectively evaluated for impairment	213,033,000	211,168,000	197,636,000
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Balance, beginning of year	874,000	994,000	790,000
Provision for loan losses	100,000	113,000	267,000
Losses charged off	(217,000)	(234,000)	(64,000)
Recoveries	129,000	1,000	1,000
Balance, end of period	886,000	874,000	994,000
Individually evaluated for impairment	25,000	6,000	0
Collectively evaluated for impairment	861,000	868,000	994,000
Ending balance	315,123,000	366,823,000	232,348,000
Individually evaluated for impairment	1,026,000	1,752,000	0
Collectively evaluated for impairment	$ 314,097,000	360,825,000	232,348,000
1-4 Family residential properties
Financing Receivable, Impaired [Line Items]
Period When Loans Are Charged Down	180 days
Consumer loans
Financing Receivable, Impaired [Line Items]
Balance, beginning of year	$ 693,000	642,000	386,000
Provision for loan losses	361,000	501,000	633,000
Losses charged off	(521,000)	(664,000)	(553,000)
Recoveries	270,000	214,000	176,000
Balance, end of period	803,000	693,000	642,000
Individually evaluated for impairment	1,000	0	0
Collectively evaluated for impairment	802,000	693,000	642,000
Ending balance	39,070,000	41,857,000	43,739,000
Individually evaluated for impairment	200,000	213,000	0
Collectively evaluated for impairment	38,870,000	41,644,000	43,739,000
Unallocated [Member]
Financing Receivable, Impaired [Line Items]
Balance, beginning of year	36,000	224,000	232,000
Provision for loan losses	(36,000)	(188,000)	(8,000)
Losses charged off	0	0	0
Recoveries	0	0	0
Balance, end of period	0	36,000	224,000
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	0	36,000	224,000
Ending balance	0	0	0
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	0	0	$ 0
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	9,000	14,000
Financing Receivable, Net	259,000	8,086,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial/Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	9,000
Financing Receivable, Net	259,000	3,840,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Agriculture/Agricultural Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	0
Financing Receivable, Net	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	0
Financing Receivable, Net	0	4,246,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer loans
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	0
Financing Receivable, Net	0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Unallocated [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	0
Financing Receivable, Net	$ 0	$ 0

Loans and Allowance for Loan 63

Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses (PCI Loans) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 08, 2016
Carrying Amount [Abstract]
Loans Receivable, Net	$ 1,939,501,000	$ 1,825,992,000
Loans and Leases Receivable, Net Amount	1,918,499,000	1,808,064,000
Contractual Payments at Acquisition [Abstract]
Financing Receivable, Net			$ 8,688,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	9,000	14,000
Receivables Acquired with Deteriorated Credit Quality [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	259,000	8,086,000
Financing Receivable, Allowance for Credit Losses	9,000	14,000
Loans and Leases Receivable, Net Amount	250,000	8,072,000
Contractual Payments at Acquisition [Abstract]
Business Combination, Acquired Receivables, Gross Contractual Amount			10,650,000
Financing Receivable, Net	259,000	8,086,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	1,200,000
Certain Loans Acquired In A Transfer. Nonaccretable Difference			(1,962,000)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition			8,688,000
Certain Loans Acquired in Transfer, Accretable Yield			0
Business Combination, Acquired Receivables, Fair Value			$ 8,688,000
1-4 Family residential properties
Carrying Amount [Abstract]
Loans Receivable, Net	293,667,000	326,415,000
1-4 Family residential properties | Receivables Acquired with Deteriorated Credit Quality [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	0	622,000
Multifamily residential properties
Carrying Amount [Abstract]
Loans Receivable, Net	61,798,000	83,200,000
Multifamily residential properties | Receivables Acquired with Deteriorated Credit Quality [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	0	1,011,000
Commercial real estate
Carrying Amount [Abstract]
Loans Receivable, Net	681,757,000	630,135,000
Commercial real estate | Receivables Acquired with Deteriorated Credit Quality [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	251,000	3,723,000
Loans secured by real estate
Carrying Amount [Abstract]
Loans Receivable, Net	1,271,999,000	1,214,962,000
Loans secured by real estate | Receivables Acquired with Deteriorated Credit Quality [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	251,000	5,356,000
Commercial and industrial loans
Carrying Amount [Abstract]
Loans Receivable, Net	444,263,000	409,033,000
Commercial and industrial loans | Receivables Acquired with Deteriorated Credit Quality [Member]
Carrying Amount [Abstract]
Loans Receivable, Net	$ 8,000	$ 2,730,000

Premises and Equipment, Net (De

Premises and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 67,445	$ 73,036
Accumulated depreciation and amortization	29,179	32,744
Total	38,266	40,292
Depreciation Expense	2,655	2,495	$ 2,196
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	9,933	5,837
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	37,229	44,484
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	16,145	18,340
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,109	4,089
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 29	$ 286

Goodwill and Intangible Asset65

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 08, 2016	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Gross Carrying Value [Abstract]
Goodwill not subject to amortization			$ 63,910	$ 61,551
Intangibles from branch acquisition			3,015	3,015
Core deposit intangibles			19,862	19,862
Customer list intangibles			3,731	3,731
Total Goodwill and Intangible Assets, Gross Carrying Value			90,518	88,159
Goodwill and Intangible Assets Accumulated Amortization [Abstract]
Goodwill not subject to amortization (effective 1/1/02), Accumulated Amortization			3,760	3,760
Total Goodwill and Intangible Assets, Accumulated Amortization			20,533	18,521
Total Amortization Expense [Abstract]
Amortization of intangible assets			2,153	1,909	$ 891
Estimated amortization expense [Abstract]
For year ended 12/31/18			1,954
For year ended 12/31/19			1,778
For year ended 12/31/20			1,576
For year ended 12/31/21			1,304
For year ended 12/31/22			1,195
First Clover Leaf [Member]
Estimated amortization expense [Abstract]
Goodwill, Acquired During Period	$ 19,143	$ 19,143
Intangibles from branch acquisitions
Goodwill and Intangible Assets Accumulated Amortization [Abstract]
Intangible Assets, Accumulated Amortization			3,015	3,015
Core deposit intangibles
Goodwill and Intangible Assets Accumulated Amortization [Abstract]
Intangible Assets, Accumulated Amortization			11,473	9,644
Total Amortization Expense [Abstract]
Amortization of intangible assets			1,829	1,628	876
Customer list intangibles
Goodwill and Intangible Assets Accumulated Amortization [Abstract]
Intangible Assets, Accumulated Amortization			2,285	2,102
Total Amortization Expense [Abstract]
Amortization of intangible assets			183	183	15
Mortgage Servicing Rights [Member]
Total Amortization Expense [Abstract]
Amortization of intangible assets			$ 141	$ 98	$ 0

Goodwill and Intangible Asset66

Goodwill and Intangible Assets Reconciliation of purchase price to goodwill recorded (Details) - USD ($)	Sep. 08, 2016	Sep. 30, 2017	Dec. 31, 2017	Aug. 14, 2015
First Clover Leaf [Member]
Reconciliation of purchase price to goodwill recorded [Line Items]
Business Combination, Purchase Price	$ 8,741,000
Fair value of securities	109,174,000
Fair value of OREO	1,987,000
Fair value of premises and equipment	(11,581,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	438,265,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	536,686,000
Fair value of FHLB advances	15,113,000
Fair value of subordinated debentures	(3,269,000)
Business Combination, Net Fair Value Adjustments	10,402,000
Goodwill Provisionally Recorded		$ 16,800,000
Goodwill, Acquired During Period	19,143,000	19,143,000
Measurement Period Adjustment to Other Liabilities		2,000,000
Measurement Period Adjustment to Other Assets		$ 300,000
OldNationalBankBranches [Member]
Reconciliation of purchase price to goodwill recorded [Line Items]
Fair value of premises and equipment				$ (4,422,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans				152,397,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			$ 4,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits				453,647,000
Fair Value Adjustments [Member] | First Clover Leaf [Member]
Reconciliation of purchase price to goodwill recorded [Line Items]
Fair value of securities	737,000
Fair value of loans	3,475,000
Fair value of OREO	754,000
Fair value of premises and equipment	(1,963,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	10,403,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,994,000
Fair value of FHLB advances	113,000
Fair value of subordinated debentures	(731,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	(4,660,000)
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets, Net	10,683,000
Goodwill, Acquired During Period	$ 7,758,000
Fair Value Adjustments [Member] | OldNationalBankBranches [Member]
Reconciliation of purchase price to goodwill recorded [Line Items]
Fair value of premises and equipment				125,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans				(3,377,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits				$ 837,000

Goodwill and Intangible Asset67

Goodwill and Intangible Assets Mortgage Servicing Rights (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ (2,153,000)	$ (1,909,000)	$ (891,000)
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,069,000	0	1,069,000
Capitalization Of Mortgage Servicing Rights		0	14,000
Amortization of intangible assets		(141,000)	(98,000)	$ 0
Finite-Lived Intangible Assets, Net	$ 985,000	$ 844,000	$ 985,000

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deposits, by Type [Abstract]
Noninterest-bearing Deposit Liabilities	$ 480,283	$ 471,206
Interest-bearing Domestic Deposit, Demand	700,376	716,204
Interest-bearing Domestic Deposit, Savings	359,065	356,740
Interest-bearing Domestic Deposit, Money Market	390,880	432,656
Interest-bearing Domestic Deposit, Time Deposits	344,035	353,081
Total deposits	2,274,639	2,329,887
Time Deposits, $100,000 or More	167,073	151,262	$ 88,855
Interest expense for the year	730	423	$ 493
Maturities of Time Deposits [Abstract]
Time Deposit Maturities, Next Twelve Months	224,622
Time Deposit Maturities, Year Two	55,529
Time Deposit Maturities, Year Three	35,529
Time Deposit Maturities, Year Four	15,568
Time Deposit Maturities, Year Five	11,914
Time Deposit Maturities, after Year Five	873
Time Deposits	344,035
Total of Public entitiy balances	$ 100,828	$ 146,100

Deposits Deposit Interest Compo

Deposits Deposit Interest Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Interest-bearing demand	$ 588	$ 274	$ 117
Savings	486	445	398
Money market	1,224	719	605
Time deposits	1,697	1,275	1,162
Total	$ 3,995	$ 2,713	$ 2,282

Borrowings Schedule of Borrowin

Borrowings Schedule of Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Borrowings [Line Items]
Short-term Debt	$ 0
Long-term Debt	10,313	$ 14,063
Advances from Federal Home Loan Banks	60,038	40,094
Junior subordinated debentures	24,000	23,917
Short Term and Long Term Borrowings	249,739	267,837
Securities Sold under Agreements to Repurchase [Member]
Schedule of Borrowings [Line Items]
Short-term Debt	155,388	185,763
Notes Payable, Other Payables [Member]
Schedule of Borrowings [Line Items]
Short-term Debt	$ 0	$ 4,000

FHLB Advances (Details)

FHLB Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Advances from Federal Home Loan Banks	$ 60,038	$ 40,094
Maturities of Long-term Debt [Abstract]
Long-term Debt	10,313	14,063
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	24,000	$ 23,917
FHLB Advances [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	25,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	5,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	15,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	10,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,000
Long-term Debt	60,000
Debt Instrument, Unamortized Discount (Premium), Net	38
Subordinated Debt [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	24,620
Long-term Debt	24,620
Debt Instrument, Unamortized Discount (Premium), Net	$ (620)
FHLB advance, 3-Year Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	3-year
Federal Home Loan Bank Advances Interest Rate	1.30%
Advances from Federal Home Loan Banks	$ 5,000
FHLB advance, 2-Year Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	2-year
Federal Home Loan Bank Advances Interest Rate	0.99%
Advances from Federal Home Loan Banks	$ 5,000
FHLB advance, 3-Year Original Maturity 2 [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	3-year
Federal Home Loan Bank Advances Interest Rate	1.42%
Advances from Federal Home Loan Banks	$ 10,000
FHLB Advance 3 Year Original Maturity 3 [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	3-year
Federal Home Loan Bank Advances Interest Rate	1.75%
Advances from Federal Home Loan Banks	$ 5,000
FHLB Advance 2.5 Year Original Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	2.5-year
Federal Home Loan Bank Advances Interest Rate	1.67%
Advances from Federal Home Loan Banks	$ 5,000
FHLB Advance, 2-Year Original Maturity 2 [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	2-year
Federal Home Loan Bank Advances Interest Rate	1.56%
Advances from Federal Home Loan Banks	$ 5,000
FHLB Advance, 1.5-Year Original Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	1.5-year
Federal Home Loan Bank Advances Interest Rate	1.49%
Advances from Federal Home Loan Banks	$ 5,000
FHLB advance, 6-Year Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	6-year
Federal Home Loan Bank Advances Interest Rate	2.30%
Advances from Federal Home Loan Banks	$ 5,000
FHLB Advance 3.5 Year Original Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	3.5-year
Federal Home Loan Bank Advances Interest Rate	1.83%
Advances from Federal Home Loan Banks	$ 5,000
FHLB Advance, 7 Year Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	7-year
Federal Home Loan Bank Advances Interest Rate	2.55%
Advances from Federal Home Loan Banks	$ 5,000
FHLB advance, 8-Year Maturity [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank Advances, Original Maturity Term	8-year
Federal Home Loan Bank Advances Interest Rate	2.40%
Advances from Federal Home Loan Banks	$ 5,000

Borrowings Repurchase Agreement

Borrowings Repurchase Agreements and Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Securities Sold Under Agreements to Repurchase Weighted Average Rate	0.0951%
Securities Sold under Agreements to Repurchase	$ 155,388	$ 185,763
Securities Sold under Agreements to Repurchase Increase (Decrease)	(30,400)
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Maximum outstanding at any month-end	163,626	185,763	$ 128,842
Average amount outstanding for the year	$ 144,674	$ 129,734	$ 113,748

Borrowings Securities Sold unde

Borrowings Securities Sold under Agreement to Repurchase (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Securities Sold under Agreements to Repurchase	$ 155,388	$ 185,763
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Short-term Debt [Line Items]
Securities Sold under Agreements to Repurchase	100,895	100,526
US States and Political Subdivisions Debt Securities [Member]
Short-term Debt [Line Items]
Securities Sold under Agreements to Repurchase	0	1,173
Mortgage-backed securities
Short-term Debt [Line Items]
Securities Sold under Agreements to Repurchase	$ 54,493	$ 84,064

Borrowings Debt (Details)

Borrowings Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 07, 2016
Line of Credit Facility [Line Items]
Short-term Debt	$ 0
Long Term Debt, Original Debt, Amount			$ 15,000
Long-term Debt	10,313	$ 14,063
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,000
Line of Credit Facility, Interest Rate Spread	2.25%
Long-term Debt [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate at Period End	3.67%	2.91%
Line of Credit Facility, Interest Rate Spread	2.25%

Borrowings Subordinated Debentu

Borrowings Subordinated Debentures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 08, 2016	Apr. 26, 2006	Feb. 27, 2004
Debt Instrument [Line Items]
Junior subordinated debentures	$ 24,000	$ 23,917
FMIS Trust I [Member]
Debt Instrument [Line Items]
Trust preferred securities issued					$ 10,000
Investment in Statutory Trust					$ 310
Junior subordinated debentures	10,310
FMIS Trust II [Member]
Debt Instrument [Line Items]
Trust preferred securities issued				$ 10,000
Investment in Statutory Trust				$ 310
Junior subordinated debentures	$ 10,310
CLS Trust I [Member]
Debt Instrument [Line Items]
Trust preferred securities issued			$ 4,000
Investment in Statutory Trust			$ 124
Junior Subordinated Debt [Member] | FMIS Trust I [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	three-month London Interbank Offered Rate (“LIBOR”) plus 280 basis points
Debt Instrument, Interest Rate at Period End	4.21%	3.73%
Junior Subordinated Debt [Member] | FMIS Trust II [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	bore interest at a fixed rate of 6.98% paid quarterly until June 15, 2011 and then converted to floating rate (LIBOR plus 160 basis points) after June 15, 2011
Debt Instrument, Interest Rate at Period End	3.188%	2.56%
Junior Subordinated Debt [Member] | CLS Trust I [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	bear interest at three-month LIBOR plus 185 basis points
Debt Instrument, Interest Rate at Period End	3.438%	2.813%

Regulatory Capital (Details)

Regulatory Capital (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Phantom section (for regulatory ratios):
Capital ($)	$ 290,843	$ 270,062
Capital to RWA (%)	12.70%	12.79%
Capital Required for Capital Adequacy ($)	$ 211,848	$ 182,137
Capital Required for Capital Adequacy to RWA (%)	9.25%	8.63%
Tier One Risk Based Capital ($)	$ 270,866	$ 253,258
Tier One Risk Based Capital to RWA (%)	11.83%	11.99%
Tier One Risk Based Capital Required for Capital Adequacy ($)	$ 166,043	$ 139,903
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	7.25%	6.63%
Common Equity Tier One Risk Based Capital ($)	$ 246,866	$ 229,341
Common Equity Tier One Risk Based Capital To RWA (%)	10.78%	10.86%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($)	$ 131,690	$ 108,226
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	5.75%	5.13%
Tier One Leverage Capital to Average Assets (%)	9.91%	9.19%
Tier One Leverage Capital Required for Capital Adequacy ($)	$ 109,381	$ 110,242
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%)	4.00%	4.00%
Description of Regulatory Requirements, Capital Adequacy Purposes	Quantitative measures established by each regulatory capital standards to ensure capital adequacy require the Company and its subsidiary bank to maintain a minimum capital amounts and ratios (set forth in the table below).
First Clover Leaf [Member]
Phantom section (for regulatory ratios):
Capital ($)		$ 78,145
Capital to RWA (%)		15.08%
Capital Required for Capital Adequacy ($)		$ 44,698
Capital Required for Capital Adequacy to RWA (%)		8.63%
Capital Required to be Well Capitalized ($)		$ 51,824
Capital Required to be Well Capitalized to RWA (%)		10.00%
Tier One Risk Based Capital ($)		$ 78,145
Tier One Risk Based Capital to RWA (%)		15.08%
Tier One Risk Based Capital Required for Capital Adequacy ($)		$ 34,333
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)		6.63%
Tier One Risk Based Capital Required to be Well Capitalized ($)		$ 41,459
Tier One Risk Based Capital Required to be Well Capitalized to RWA (%)		8.00%
Common Equity Tier One Risk Based Capital ($)		$ 78,145
Common Equity Tier One Risk Based Capital To RWA (%)		15.08%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($)		$ 26,560
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)		5.13%
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized ($)		$ 33,685
Common Equity Tier One Risk Based Capital Required To Be Well Capitalized to RiWA (%)		6.50%
Tier One Leverage Capital to Average Assets (%)		12.04%
Tier One Leverage Capital Required for Capital Adequacy ($)		$ 25,963
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%)		4.00%
Tier One Leverage Capital Required to be Well Capitalized ($)		$ 32,453
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (%)		5.00%
First Mid Bank [Member]
Phantom section (for regulatory ratios):
Capital ($)	$ 282,621	$ 197,552
Capital to RWA (%)	12.39%	12.44%
Capital Required for Capital Adequacy ($)	$ 211,064	$ 137,019
Capital Required for Capital Adequacy to RWA (%)	9.25%	8.63%
Capital Required to be Well Capitalized ($)	$ 228,177	$ 158,817
Capital Required to be Well Capitalized to RWA (%)	10.00%	10.00%
Tier One Risk Based Capital ($)	$ 262,644	$ 180,826
Tier One Risk Based Capital to RWA (%)	11.51%	11.39%
Tier One Risk Based Capital Required for Capital Adequacy ($)	$ 165,428	$ 105,247
Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	7.25%	6.63%
Tier One Risk Based Capital Required to be Well Capitalized ($)	$ 182,542	$ 127,090
Tier One Risk Based Capital Required to be Well Capitalized to RWA (%)	8.00%	8.00%
Common Equity Tier One Risk Based Capital ($)	$ 262,644	$ 180,826
Common Equity Tier One Risk Based Capital To RWA (%)	11.51%	11.39%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy ($)	$ 131,202	$ 81,417
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to RWA (%)	5.75%	5.13%
Common Equity Tier One Risk Based Capital Required to Be Well Capitalized ($)	$ 148,315	$ 103,261
Common Equity Tier One Risk Based Capital Required To Be Well Capitalized to RiWA (%)	6.50%	6.50%
Tier One Leverage Capital to Average Assets (%)	9.63%	8.62%
Tier One Leverage Capital Required for Capital Adequacy ($)	$ 109,113	$ 83,938
Tier One Leverage Capital Required for Capital Adequacy to Average Assets (%)	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized ($)	$ 136,392	$ 104,922
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (%)	5.00%	5.00%

Disclosures of Fair Values of77

Disclosures of Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale: [Abstract]
Total available-for-sale securities	$ 578,579	$ 619,848
Impaired Loans Receivable [Abstract]
Carrying amount of loans with a specific allowance		8,370
Fair value of loans with a specific allowance		6,938
Specific Allowance		1,432
Fair Value, Measurements, Recurring [Member]
Available-for-sale: [Abstract]
Total available-for-sale securities	578,579	619,848
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale: [Abstract]
Total available-for-sale securities	172	144
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Available-for-sale: [Abstract]
Total available-for-sale securities	575,859	618,052
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Available-for-sale: [Abstract]
Total available-for-sale securities	2,548	1,652
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans Receivable [Abstract]
Carrying amount of loans with a specific allowance	3,665
Fair value of loans with a specific allowance	3,053
Specific Allowance	612
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Total available-for-sale securities	113,770	136,324
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member]
Available-for-sale: [Abstract]
Total available-for-sale securities	113,770	136,324
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Available-for-sale: [Abstract]
Total available-for-sale securities	113,770	136,324
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Total available-for-sale securities	166,266	162,705
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member]
Available-for-sale: [Abstract]
Total available-for-sale securities	166,266	162,705
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Available-for-sale: [Abstract]
Total available-for-sale securities	166,266	162,705
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Mortgage-backed securities
Available-for-sale: [Abstract]
Total available-for-sale securities	293,811	314,991
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,652
Transfers into Level 3	0
Transfers out of Level 3	0
Total gains or losses [Abstract]
Included in net income	0
Included in other comprehensive income (loss)	1,053
Purchases, issuances, sales and settlements [Abstract]
Purchases	0
Issuances	0
Sales	0
Settlements	(157)
Ending balance	2,548
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date	0
Mortgage-backed securities | Fair Value, Measurements, Recurring [Member]
Available-for-sale: [Abstract]
Total available-for-sale securities	293,811	314,991
Mortgage-backed securities | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Mortgage-backed securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Available-for-sale: [Abstract]
Total available-for-sale securities	293,811	314,991
Mortgage-backed securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Trust preferred securities
Available-for-sale: [Abstract]
Total available-for-sale securities	2,548	1,652
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,906
Transfers into Level 3	0
Transfers out of Level 3	0
Total gains or losses [Abstract]
Included in net income	0
Included in other comprehensive income (loss)	(174)
Purchases, issuances, sales and settlements [Abstract]
Purchases	0
Issuances	0
Sales	0
Settlements	(80)
Ending balance	1,652
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date	0
Trust preferred securities | Fair Value, Measurements, Recurring [Member]
Available-for-sale: [Abstract]
Total available-for-sale securities	2,548	1,652
Trust preferred securities | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Trust preferred securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Available-for-sale: [Abstract]
Total available-for-sale securities	0	0
Trust preferred securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Available-for-sale: [Abstract]
Total available-for-sale securities	2,548	1,652
Other securities
Available-for-sale: [Abstract]
Total available-for-sale securities	2,184	4,176
Other securities | Fair Value, Measurements, Recurring [Member]
Available-for-sale: [Abstract]
Total available-for-sale securities	2,184	4,176
Other securities | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale: [Abstract]
Total available-for-sale securities	172	144
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
Available-for-sale: [Abstract]
Total available-for-sale securities	2,012	4,032
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)
Available-for-sale: [Abstract]
Total available-for-sale securities	$ 0	$ 0

Disclosures of Fair Values of78

Disclosures of Fair Values of Financial Instruments, Part II (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned		$ 2,754,000	$ 1,982,000
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Assets, Fair Value Disclosure, Recurring		2,548,000	1,652,000
Financial Assets [Abstract]
Available-for-sale securities		578,579,000	619,848,000
Held-to-maturity Securities		69,332,000	74,231,000
Held-to-maturity Securities, Fair Value		68,457,000	73,096,000
Other borrowings		10,313,000	18,063,000
Carrying Amount
Financial Assets [Abstract]
Cash and due from banks		88,388,000	137,002,000
Federal funds sold		491,000	38,900,000
Certificates of deposit investments		1,685,000	14,643,000
Available-for-sale securities		578,579,000	619,848,000
Held-to-maturity Securities		69,332,000
Held-to-maturity Securities, Fair Value			74,231,000
Loans held for sale		1,025,000	1,175,000
Loans net of allowance for loan losses		1,918,499,000	1,808,064,000
Interest receivable		10,832,000	10,553,000
Federal Reserve Bank stock		5,160,000	3,949,000
Federal Home Loan Bank stock		2,407,000	4,389,000
Deposits		2,274,639,000	2,329,887,000
Securities sold under agreements to repurchase		155,388,000	185,763,000
Interest payable		602,000	535,000
Federal Home Loan Bank borrowings		60,038,000	40,094,000
Other borrowings		10,313,000
Junior subordinated debentures		24,000,000	23,917,000
Fair Value
Financial Assets [Abstract]
Cash and due from banks		88,388,000	137,002,000
Federal funds sold		491,000	38,900,000
Certificates of deposit investments		1,692,000	14,651,000
Available-for-sale securities		578,579,000	619,848,000
Held-to-maturity Securities, Fair Value		68,457,000	73,096,000
Loans held for sale		1,025,000	1,175,000
Loans net of allowance for loan losses		1,899,678,000	1,795,764,000
Interest receivable		10,832,000	10,553,000
Federal Reserve Bank stock		5,160,000	3,949,000
Federal Home Loan Bank stock		2,407,000	4,389,000
Deposits		2,272,868,000	2,331,725,000
Securities sold under agreements to repurchase		155,394,000	185,766,000
Interest payable		602,000	535,000
Federal Home Loan Bank borrowings		59,968,000	40,318,000
Other borrowings		10,313,000
Junior subordinated debentures		18,050,000	17,068,000
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned		2,754,000	1,982,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value
Foreclosed Assets Held for Sale [Abstract]
Other real estate owned		91,000	173,000
Fair Value, Inputs, Level 1 [Member]
Financial Assets [Abstract]
Cash and due from banks		88,388,000	137,002,000
Federal funds sold		491,000	38,900,000
Certificates of deposit investments		0	0
Available-for-sale securities		172,000	144,000
Loans held for sale		0	0
Loans net of allowance for loan losses		0	0
Interest receivable		0	0
Federal Reserve Bank stock		0	0
Federal Home Loan Bank stock		0	0
Deposits		0	0
Securities sold under agreements to repurchase		0	0
Interest payable		0	0
Federal Home Loan Bank borrowings		0	0
Other borrowings		0
Junior subordinated debentures		0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets [Abstract]
Cash and due from banks		0	0
Federal funds sold		0	0
Certificates of deposit investments		1,692,000	14,651,000
Available-for-sale securities		575,859,000	618,052,000
Held-to-maturity Securities, Fair Value		68,457,000	73,096,000
Loans held for sale		1,025,000	1,175,000
Loans net of allowance for loan losses		0	0
Interest receivable		10,832,000	10,553,000
Federal Reserve Bank stock		5,160,000	3,949,000
Federal Home Loan Bank stock		2,407,000	4,389,000
Deposits		1,930,604,000	1,976,806,000
Securities sold under agreements to repurchase		155,394,000	185,766,000
Interest payable		602,000	535,000
Federal Home Loan Bank borrowings		59,968,000	40,318,000
Other borrowings		10,313,000
Junior subordinated debentures		18,050,000	17,068,000
Fair Value, Inputs, Level 3 [Member]
Financial Assets [Abstract]
Cash and due from banks		0	0
Federal funds sold		0	0
Certificates of deposit investments		0	0
Available-for-sale securities		2,548,000	1,652,000
Loans held for sale		0	0
Loans net of allowance for loan losses		1,899,678,000	1,795,764,000
Interest receivable		0	0
Federal Reserve Bank stock		0	0
Federal Home Loan Bank stock		0	0
Deposits		342,264,000	354,919,000
Securities sold under agreements to repurchase		0	0
Interest payable		0	0
Federal Home Loan Bank borrowings		0	0
Other borrowings		0
Junior subordinated debentures		$ 0	$ 0
Trust preferred securities | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Constant prepayment rate (in hundredths)	[1]	1.30%	1.30%
Trust preferred securities | Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount rate (in hundredths)		12.70%	13.60%
Cumulative projected prepayments (in hundredths)		21.60%	22.40%
Probability of default (in hundredths)		0.50%	0.50%
Projected cures given deferral (in hundredths)		0.00%	0.00%
Loss severity		97.70%	97.60%
Trust preferred securities | Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Discounted Cash Flow [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount rate (in hundredths)
Cumulative projected prepayments (in hundredths)
Probability of default (in hundredths)
Projected cures given deferral (in hundredths)
Loss severity
Trust preferred securities | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Discounted Cash Flow [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount rate (in hundredths)
Cumulative projected prepayments (in hundredths)
Probability of default (in hundredths)
Projected cures given deferral (in hundredths)
Loss severity
Impaired loans (collateral dependent) | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 3,053,000	$ 6,938,000
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 0	$ 0
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)		0.00%	0.00%
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)		40.00%	40.00%
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value (in hundredths)		20.00%	20.00%
Impaired loans (collateral dependent) | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 3,053,000	$ 6,938,000
Foreclosed assets held for sale | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		91,000	173,000
Foreclosed assets held for sale | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Foreclosed assets held for sale | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 0	$ 0
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)		0.00%	0.00%
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)		40.00%	40.00%
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Third Party Valuations [Member]
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract]
Discount to reflect realizable value less estimated selling costs (in hundredths)		35.00%	35.00%
Foreclosed assets held for sale | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 91,000	$ 173,000
[1]	Every five years

Deferred Compensation Plan (Det

Deferred Compensation Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 3,540
Shares, Issued	6,875	4,683

Stock Incentive Plan (Details)

Stock Incentive Plan (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	149,983
Options, Grants in Period, Gross	0	0	0
RSA/RSU, Grants in Period, Gross	18,391	13,912	18,002
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Grants in Period, Gross				59,500
Stock Unit Awards and Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSA/RSU, Grants in Period, Gross			18,002

Stock Incentive Plan Compensati

Stock Incentive Plan Compensation Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense, Net of Tax	$ 620	$ 250	$ 246
Stock Unit Awards and Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	954	384	378
Income Tax Expense (Benefit)	$ (334)	$ (134)	$ (132)

Stock Incentive Plan Summary of

Stock Incentive Plan Summary of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of year	40,500	45,500	52,000
Granted	0	0	0
Exercised	(27,500)	(2,500)	0
Forfeited or expired	(2,500)	(2,500)	(6,500)
Outstanding, end of year	10,500	40,500	45,500
Options, Exercisable, Number	10,500	40,500	45,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding Options, Weighted Average Exercise Price, Beginning of Year	$ 24.65	$ 24.67	$ 24.64
Options, Grants in Period, Weighted Average Exercise Price	0	0	0
Options, Exercises in Period, Weighted Average Exercise Price	25.42	24.86	0
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	23	24.86	24.43
Outstanding Options, Weighted Average Exercise Price, End of Year	23	24.65	24.67
Options, Exercisable, Weighted Average Exercise Price	$ 23	$ 24.65	$ 24.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options, Outstanding, Weighted Average Remaining Contractual Term	350 days	1 year 153 days	2 years 153 days
Options, Exercisable, Weighted Average Remaining Contractual Term	350 days	1 year 153 days	2 years 153 days
Options, Outstanding, Intrinsic Value	$ 163,170	$ 378,850	$ 63,000
Options, Exercisable, Intrinsic Value	163,170	378,850	$ 63,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 259,000	$ 14,000
Antidilutive Outstanding option shares			24,500

Stock Incentive Plan Summary 83

Stock Incentive Plan Summary of Options by Range of Exercise Price (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted-Average Exercise Price	$ 23	$ 24.65	$ 24.67	$ 24.64
$22.50 to $24.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding	10,500
Weighted-Average Remaining Contractual Life	350 days
Weighted-Average Exercise Price	$ 23
Number Exercisable	10,500
Weighted-Average Exercise Price	$ 23

Stock Incentive Plan Summary 84

Stock Incentive Plan Summary of Unvested Stock and Stock Units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 954,000
Other than Options, Nonvested, Number	0	32,338	30,169	26,897
Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 0	$ 22.64	$ 20.87	$ 22.95
RSA/RSU, Grants in Period, Gross	18,391	13,912	18,002
Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 30.65	$ 26.09	$ 20.14
Other than Options, Vested in Period	(50,729)	(11,743)	(14,730)
Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 25.54	$ 22.18	$ 23.77
Other than Options, Forfeited in Period	0	0	0
Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 0
Other than Options, Vested in Period, Total Fair Value	$ 260,483	$ 260,483	$ 350,075
Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options	$ 0	$ 344,000	$ 386,000
Discounted Cash Flow [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level 3) | Trust preferred securities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Loss severity

Retirement Plans SERP (Details)

Retirement Plans SERP (Details) - Supplemental Employee Retirement Plans, Defined Benefit - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual Benefit Amount	$ 50,000
Year of Benefit	20 years
Defined Benefit Plan, Other Information-Number of Employees Covered	2
Defined Benefit Plan, Other Costs	$ 40,000	$ 43,000	$ 29,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities	$ 597,000	$ 658,000

Retirement Plans Employee Retir

Retirement Plans Employee Retirement Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	100% of the first 3% and 50% of the next 2%
Defined Contribution Plan, Cost Recognized	$ 1,630	$ 1,383	$ 1,080
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Year of Benefit	20 years

Income Taxes (Details)

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
Income Tax Disclosure [Abstract]
Federal									$ 9,825	$ 11,375	$ 7,357
State									2,719	2,953	1,841
Total Current									12,544	14,328	9,198
Federal									2,047	(1,940)	(84)
State									451	(448)	104
Total Deferred									2,498	(2,388)	20
Total	$ 4,497	$ 3,538	$ 3,927	$ 3,080	$ 3,863	$ 2,812	$ 2,624	$ 2,641	$ 15,042	$ 11,940	$ 9,218

Income Taxes Income Tax Reconci

Income Taxes Income Tax 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
Effective Income Tax Rate [Line Items]
Statutory U.S. Federal Tax Rate									35.00%
Expected income taxes									$ 14,604	$ 11,823	$ 9,006
Tax-exempt income from bank owned life insurance									573	235	0
Other tax exempt income									(2,223)	(1,577)	(1,103)
Nondeductible interest expense									28	21	11
State taxes, net of federal taxes									2,062	1,628	1,264
Other items									(266)	280	41
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount									1,410	0	0
Effect of marginal tax rate									0	0	(1)
Total	$ 4,497	$ 3,538	$ 3,927	$ 3,080	$ 3,863	$ 2,812	$ 2,624	$ 2,641	$ 15,042	$ 11,940	$ 9,218

Income Taxes Temporary Differen

Income Taxes Temporary Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate [Line Items]
Allowance for loan losses	$ 5,694	$ 6,599
Available-for-sale investment securities	941	3,680
Deferred compensation	749	1,030
Supplemental retirement	170	259
Core deposit premium and other intangible assets	664	691
Deferred Tax Assets, Equity Method Investments	126	0
Other-than-temporary impairment on securities	317	438
Stock Compensation Expense	0	194
Deferred Revenue	0	101
Purchase Accounting	475	1,791
Acquisition Costs	210	319
Other	596	966
Total gross deferred tax assets	9,942	16,068
Deferred loan costs	26	178
Intangibles amortization	3,685	4,467
Prepaid expenses	232	383
Deferred Tax Liabilities, Other	158	380
FHLB stock dividend	58	0
Depreciation	1,207	740
Accumulated accretion	112	72
Mortgage servicing rights	240	387
Total gross deferred tax liabilities	5,718	6,607
Net deferred tax assets	$ 4,224	$ 9,461
Statutory U.S. Federal Tax Rate	35.00%
Scenario, Plan [Member]
Effective Income Tax Rate [Line Items]
Statutory U.S. Federal Tax Rate	21.00%

Dividend Restrictions (Details)

Dividend Restrictions (Details) $ in Millions	Dec. 31, 2017USD ($)
First Mid Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency	$ 23.9

Commitments and Contingent Li91

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commercial real estate	$ 73,268	$ 128,576
Commercial operating	223,960	236,182
Home equity	38,318	40,896
Other	69,333	70,092
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Asset	$ 404,879	475,746
Number of expected days to fund commitments	ninety days
Financial Standby Letter of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Asset	$ 10,626	$ 9,339
Period when letters of credit expire	one year or less

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Related Party Transactions [Abstract]
Beginning balance	$ 54,502,000	$ 56,045,000
New loans	29,725,000	5,450,000
Loan repayments	(7,392,000)	(6,993,000)
Ending balance	76,835,000	54,502,000
Related Party Deposit Liabilities	$ 110,324,000	$ 156,709,000

Business Combinations Narrative

Business Combinations Narrative (Details)	Sep. 08, 2016USD ($)$ / sharesshares	Sep. 30, 2017USD ($)$ / shares	Dec. 31, 2017USD ($)branch$ / sharesRate	Dec. 31, 2016$ / shares	Aug. 14, 2015USD ($)
Business Acquisition [Line Items]
Percent Of Acquiree Outstanding Stock Being Acquired In Merger	1
Percentage of business acquisition consideration paid in cash	25.00%
Right To Receive Value of Cash Option | $ / shares		$ 12.87
Common stock, par value (in dollars per share) | $ / shares			$ 4	$ 4
First Clover Leaf [Member]
Business Acquisition [Line Items]
Aggregate Total Of Cash Paid In Business Combination	$ 22,545,000
Portion of Business Acquisition Consideration Paid In Common Stock	75.00%
Right To Receive Value Of Share Option | shares	0.495
Common stock, par value (in dollars per share) | $ / shares	$ 4
Shares, Issued | shares	2,600,616
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 670,979,000
Goodwill, Acquired During Period	19,143,000	$ 19,143,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	536,686,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	438,265,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	59,320,000
OldNationalBankBranches [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets					$ 457,951,000
number of bank branches acquired | branch			12
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits					453,647,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans					152,397,000
Business Acquisition Deposit Premium Rate On Core Deposits | Rate			3.60%
Business Acquisition Deposit Premium on Core Deposits			$ 15,900,000
Business Combinations Fixed Deposit Premium For Municipal Deposits			500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			4,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			2,700,000		279,468,000
Business Combination Cash Settlement			276,800,000
Acquired Book Value [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	658,788,000
Goodwill, Acquired During Period	11,385,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	534,692,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	448,668,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 59,320,000
Acquired Book Value [Member] | OldNationalBankBranches [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets					441,222,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits			453,000,000		452,810,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans			$ 156,000,000		155,774,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents					$ 279,468,000

Business Combinations Estimated

Business Combinations Estimated Fair Values Of Assets Acquired And Liabilities Assumed (Details) - USD ($)	Sep. 08, 2016	Sep. 30, 2017	Dec. 31, 2017	Aug. 14, 2015
OldNationalBankBranches [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 2,700,000	$ 279,468,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans				(152,397,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment				4,422,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount				14,274,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				6,216,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets				1,174,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				457,951,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits				453,647,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities				507,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				457,951,000
Business Combination, Acquisition Related Costs			$ 1,400,000
Finite-Lived Intangible Asset, Useful Life			10 years
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase				3,797,000
First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 59,320,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities	(109,174,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	(438,265,000)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses	0
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets	(1,987,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment	11,581,000
Goodwill, Acquired During Period	19,143,000	$ 19,143,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4,660,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets	26,849,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	670,979,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	536,686,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities	4,177,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	582,508,000
Finite-Lived Intangible Asset, Useful Life			10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	88,471,000
Aggregate Total Of Cash Paid In Business Combination	22,545,000
Business Acquisition, Equity Interest Issued or Issuable	65,926,000
Business Combination, Value of Total Consideration Paid	88,471,000
Business Acquisition, Transaction Costs			$ 3,308,000
Business Acquisition, YTD Transaction Costs			1,967,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase	23,263,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances	15,113,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures	(3,269,000)
Acquired Book Value [Member] | OldNationalBankBranches [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				279,468,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans			(156,000,000)	(155,774,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment				4,547,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets				1,433,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				441,222,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits			$ 453,000,000	452,810,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities				507,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				457,114,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase				3,797,000
Acquired Book Value [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	59,320,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities	(109,911,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	(448,668,000)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses	(6,928,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets	(2,741,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment	9,618,000
Goodwill, Acquired During Period	11,385,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	99,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets	23,974,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	658,788,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	534,692,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities	2,103,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	579,058,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	79,730,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase	23,263,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances	15,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures	(4,000,000)
Fair Value Adjustments [Member] | OldNationalBankBranches [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans				3,377,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment				(125,000)
Business Acquisition, Goodwill, Expected Tax Deductible Amount				14,274,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				6,216,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets				(259,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				16,729,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits				837,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				$ 837,000
Fair Value Adjustments [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	0
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities	(737,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	(10,403,000)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses	(6,928,000)
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets	(754,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment	1,963,000
Goodwill, Acquired During Period	7,758,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4,561,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets	2,875,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	12,191,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,994,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities	2,074,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	3,450,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	8,741,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances	113,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures	(731,000)
Fair Value Adjustments, Accretable portion [Member] | First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	$ (8,400,000)

Business Combinations Pro Forma

Business Combinations Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
OldNationalBankBranches [Member]
Business Acquisition [Line Items]
Business Acquisitions Pro Forma Net Interest Income		$ 66,680
Business Acquisitions Pro Forma Provision For Loan Losses		1,483
Business Acquisitions Pro Forma Non-Interest Income		26,001
Business Acquisitions Pro Forma Non-Interest Expense		59,944
Business Acquisitions Pro Forma Income before Income Taxes		31,254
Business Acquisitions Pro Forma, Income Tax Expense		11,207
Business Acquisition, Pro Forma Net Income (Loss)		20,047
Pro Forma Earnings Per Share
Business Acquisitions Pro Forma, Dividends On Preferred Shares		2,200
Business Acquisitions Pro Forma, Net Income Available To Common Stockholders		$ 17,847
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 2,300
Business Acquisition, Pro Forma Earnings Per Share, Diluted		$ 2,190
Weighted Average Basic Shares Outstanding, Pro Forma		7,775,490
Pro Forma Weighted Average Shares Outstanding, Diluted		9,137,689
First Clover Leaf [Member]
Business Acquisition [Line Items]
Business Acquisitions Pro Forma Net Interest Income	$ 85,004	$ 76,619
Business Acquisitions Pro Forma Provision For Loan Losses	3,556	1,548
Business Acquisitions Pro Forma Non-Interest Income	29,118	23,217
Business Acquisitions Pro Forma Non-Interest Expense	73,997	66,864
Business Acquisitions Pro Forma Income before Income Taxes	36,569	31,424
Business Acquisitions Pro Forma, Income Tax Expense	12,910	10,671
Business Acquisition, Pro Forma Net Income (Loss)	23,659	20,753
Pro Forma Earnings Per Share
Business Acquisitions Pro Forma, Dividends On Preferred Shares	825	1,650
Business Acquisitions Pro Forma, Net Income Available To Common Stockholders	$ 22,834	$ 19,103
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 2,250	$ 2,390
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 2,220	$ 2,220
Weighted Average Basic Shares Outstanding, Pro Forma	10,149,099	7,985,089
Pro Forma Weighted Average Shares Outstanding, Diluted	10,663,710	9,347,288

Leases (Details)

Leases (Details) $ in Thousands	Dec. 31, 2017USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 2,591
Operating Leases, Future Minimum Payments, Due in Two Years	2,099
Operating Leases, Future Minimum Payments, Due in Three Years	2,099
Operating Leases, Future Minimum Payments, Due in Four Years	1,792
Operating Leases, Future Minimum Payments, Due in Four and Five Years [Abstract]	1,793
Operating Leases, Future Minimum Payments, Due Thereafter	32,882
Operating Leases, Future Minimum Payments Due	$ 43,256

Leases Lease Terms Details (Det

Leases Lease Terms Details (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense, Net	$ 2,720,000	$ 2,620,000	$ 1,749,000
Minimum [Member]
Operating Leased Assets [Line Items]
Term of Lease	one year
Renewal Term of Lease	one year
Maximum [Member]
Operating Leased Assets [Line Items]
Term of Lease	fifteen years
Renewal Term of Lease	five years

Parent Company Only Financial98

Parent Company Only Financial Statements Condensed balance sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Premises and equipment, net	$ 38,266	$ 40,292
Other assets	18,976	25,904
Total assets	2,841,539	2,884,535
Other liabilities	8,595	5,603
Total liabilities	2,533,575	2,603,862
Stockholders’ equity	307,964	280,673	$ 205,009	$ 164,916
Total liabilities and stockholders’ equity	2,841,539	2,884,535
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	8,296	2,382
Premises and equipment, net	2,654	2,648
Investment in subsidiaries	328,830	315,752
Other assets	3,555	2,982
Total assets	343,335	323,764
Debt	34,313	41,979
Other liabilities	1,058	1,112
Total liabilities	35,371	43,091
Stockholders’ equity	307,964	280,673
Total liabilities and stockholders’ equity	$ 343,335	$ 323,764

Parent Company Only Financial99

Parent Company Only Financial Statements Condensed statements of 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
Condensed Financial Statements, Captions [Line Items]
Income before income taxes	$ 9,122	$ 11,133	$ 12,127	$ 9,344	$ 10,660	$ 8,120	$ 7,553	$ 7,447	$ 41,726	$ 33,780	$ 25,730
Income tax benefit	(4,497)	(3,538)	(3,927)	(3,080)	(3,863)	(2,812)	(2,624)	(2,641)	(15,042)	(11,940)	(9,218)
Net income available to common stockholders	$ 4,625	$ 7,595	$ 8,200	$ 6,264	$ 6,797	$ 5,308	$ 4,654	$ 4,256	26,684	21,015	14,312
Other Comprehensive Income (Loss), Net of Tax									3,525	(6,484)	1,598
Comprehensive income									30,209	15,356	18,110
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries									18,925	19,475	6,094
Other income									1,227	66	66
Total income									20,152	19,541	6,160
Operating expenses									3,902	3,491	2,556
Income before income taxes									16,250	16,050	3,604
Income tax benefit									864	1,073	974
Income before equity in undistributed earnings of subsidiaries									17,114	17,123	4,578
Equity in undistributed earnings of subsidiaries									9,570	4,717	11,934
Net income available to common stockholders									26,684	21,840	16,512
Other Comprehensive Income (Loss), Net of Tax									3,525	(6,484)	1,598
Comprehensive income									$ 30,209	$ 15,356	$ 18,110

Parent Company Only Financia100

Parent Company Only Financial Statements Condensed statements of cash flows (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net income	$ 6,797	$ 5,308	$ 4,929	$ 4,806	$ 26,684	$ 21,840	$ 16,512
Depreciation, amortization and accretion, net					8,134	7,936	4,442
Increase in other assets					668	1,802	169
Increase (decrease) in other liabilities					666	(2,875)	(762)
Net cash provided by operating activities					46,154	27,422	21,998
Cash Acquired from Acquisition					0	36,774	276,661
Net cash provided by (used in) investing activities					(55,962)	(78,059)	10,369
Repayment of short-term debt					(4,000)	(3,938)	(2,000)
Proceeds from short-term debt					0	7,000	2,000
Repayments of Long-term Debt					(3,750)	0	0
Proceeds from long-term debt					0	15,000	0
Proceeds from issuance of common stock					4,399	195	28,222
Direct expenses related to capital transactions					(216)	(229)	0
Purchase of treasury stock					(797)	0	(1,066)
Dividends paid on preferred stock					0	(1,286)	(2,002)
Dividends paid on common stock					(7,228)	(5,277)	(3,487)
Net cash provided by (used in) financing activities					(77,215)	110,755	31,687
Increase (decrease) in cash					(87,023)	60,118	64,054
Cash and cash equivalents at beginning of period				115,784	175,902	115,784	51,730
Cash and cash equivalents at end of period	175,902				88,879	175,902	115,784
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income					26,684	21,840	16,512
Depreciation, amortization and accretion, net					82	87	87
Dividends from subsidiaries					18,925	19,475	6,094
Equity in undistributed earnings of subsidiaries					(9,570)	(4,717)	(11,934)
Increase in other assets					(19,348)	(111,379)	(4,707)
Increase (decrease) in other liabilities					733	153	37
Net cash provided by operating activities					17,506	(74,541)	6,089
Payments to Acquire Additional Interest in Subsidiaries					0	(5,000)	(27,825)
Cash Acquired from Acquisition					0	68,798	0
Net cash provided by (used in) investing activities					0	63,798	(27,825)
Repayment of short-term debt					(4,000)	(3,000)	0
Proceeds from short-term debt					0	7,000	0
Repayments of Long-term Debt					(3,750)	(938)	0
Proceeds from long-term debt					0	15,000	0
Proceeds from issuance of common stock					4,399	195	28,222
Direct expenses related to capital transactions					(216)	(229)	0
Purchase of treasury stock					(797)	0	(1,066)
Dividends paid on preferred stock					0	(1,286)	(2,002)
Dividends paid on common stock					(7,228)	(5,277)	(3,487)
Net cash provided by (used in) financing activities					(11,592)	11,465	21,667
Increase (decrease) in cash					5,914	722	(69)
Cash and cash equivalents at beginning of period				$ 1,660	2,382	1,660	1,729
Cash and cash equivalents at end of period	$ 2,382				$ 8,296	$ 2,382	$ 1,660

Quarterly Financial Data -- 101

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
Quarterly Financial Data [Abstract]
Interest income	$ 25,313	$ 24,614	$ 25,446	$ 24,182	$ 23,011	$ 18,623	$ 16,883	$ 16,979
Interest expense	1,838	1,741	1,493	1,410	1,487	1,000	913	892	$ 6,482	$ 4,292	$ 3,499
Net interest income	23,475	22,873	23,953	22,772	21,524	17,623	15,970	16,087	93,073	71,204	55,752
Provision for loan losses	2,411	1,489	1,840	1,722	899	1,081	733	113
Net interest income after provision for loan losses	21,064	21,384	22,113	21,050	20,625	16,542	15,237	15,974	85,611	68,378	54,434
Other income	7,210	7,661	7,969	7,496	6,911	6,898	6,459	6,644	30,336	26,912	20,544
Other expense	19,152	17,912	17,955	19,202	16,876	15,320	14,143	15,171	74,221	61,510	49,248
Income before income taxes	9,122	11,133	12,127	9,344	10,660	8,120	7,553	7,447	41,726	33,780	25,730
Total	4,497	3,538	3,927	3,080	3,863	2,812	2,624	2,641	15,042	11,940	9,218
Net income					6,797	5,308	4,929	4,806	26,684	21,840	16,512
Dividends on preferred shares					0	0	275	550	0	825	2,200
Net income available to common stockholders	$ 4,625	$ 7,595	$ 8,200	$ 6,264	$ 6,797	$ 5,308	$ 4,654	$ 4,256	$ 26,684	$ 21,015	$ 14,312
Basic earnings per common share	$ 0.37	$ 0.61	$ 0.66	$ 0.50	$ 0.55	$ 0.51	$ 0.51	$ 0.50	$ 2.13	$ 2.07	$ 1.84
Diluted earnings per common share	$ 0.37	$ 0.61	$ 0.66	$ 0.50	$ 0.55	$ 0.51	$ 0.50	$ 0.49	$ 2.13	$ 2.05	$ 1.81