First Busey (BUSE) 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 08, 2018
Document and Entity Information
Entity Registrant Name	FIRST BUSEY CORP /NV/
Entity Central Index Key	314,489
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		48,723,534
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents (interest-bearing 2018 $251,199; 2017 $234,889)	$ 367,525	$ 353,272
Securities available for sale	822,101	872,682
Securities held to maturity	459,007	443,550
Securities equity investments	5,028	5,378
Loans held for sale	29,034	94,848
Portfolio loans (net of allowance for loan losses 2018 $52,649; 2017 $53,582)	5,478,804	5,465,918
Premises and equipment, net	118,985	116,913
Goodwill	267,685	269,346
Other intangible assets, net	37,212	38,727
Cash surrender value of bank owned life insurance	127,463	126,737
Deferred tax asset, net	16,619	17,296
Other assets	49,283	55,973
Total assets	7,778,746	7,860,640
Deposits:
Noninterest-bearing	1,651,333	1,597,421
Interest-bearing	4,679,841	4,528,544
Total deposits	6,331,174	6,125,965
Securities sold under agreements to repurchase	235,311	304,566
Short-term borrowings		220,000
Long-term debt	50,000	50,000
Senior notes, net of unamortized issuance costs	39,438	39,404
Subordinated notes, net of unamortized issuance costs	64,684	64,715
Junior subordinated debt owed to unconsolidated trusts	71,044	71,008
Other liabilities	44,949	49,979
Total liabilities	6,836,600	6,925,637
Commitments and contingencies (See "Note 14: Outstanding Commitments and Contingent Liabilities")
Stockholders' Equity
Common stock, $.001 par value, authorized 66,666,667 shares; shares issued 2018 and 2017 49,185,581	49	49
Additional paid-in capital	1,084,411	1,084,889
Accumulated deficit	(119,467)	(132,122)
Accumulated other comprehensive loss	(9,674)	(2,810)
Total stockholders' equity before treasury stock	955,319	950,006
Common stock shares held in treasury at cost, 2018 468,342; 2017 500,638	(13,173)	(15,003)
Total stockholders' equity	942,146	935,003
Total liabilities and stockholders' equity	$ 7,778,746	$ 7,860,640
Common shares outstanding at period end	48,717,239	48,684,943

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CONSOLIDATED BALANCE SHEETS
Cash and cash equivalents, interest-bearing (in dollars)	$ 251,199	$ 234,889
Portfolio Loans, allowance for loan losses (in dollars)	$ 52,649	$ 53,582
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	66,666,667	66,666,667
Common stock, shares issued	49,185,581	49,185,581
Common stock shares held in treasury	468,342	500,638

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Interest and fees on loans	$ 60,960	$ 40,597
Interest and dividends on investment securities:
Taxable interest income	6,413	3,603
Non-taxable interest income	1,260	727
Total interest income	68,633	44,927
Interest expense:
Deposits	5,987	2,044
Federal funds purchased and securities sold under agreements to repurchase	341	123
Short-term borrowings	476	47
Long-term debt	164	113
Senior notes	400
Subordinated notes	793
Junior subordinated debt owed to unconsolidated trusts	715	587
Total interest expense	8,876	2,914
Net interest income	59,757	42,013
Provision for loan losses	1,008	500
Net interest income after provision for loan losses	58,749	41,513
Non-interest income:
Commissions and brokers' fees, net	1,096	722
Mortgage revenue	1,643	2,134
Security gains, net		857
Other	1,895	1,280
Total non-interest income	22,486	20,014
Non-interest expense:
Salaries, wages and employee benefits	28,819	21,890
Net occupancy expense of premises	3,821	3,185
Furniture and equipment expenses	1,913	1,619
Data processing	5,231	3,598
Amortization of intangible assets	1,515	1,207
Other	9,741	6,120
Total non-interest expense	51,040	37,619
Income before income taxes	30,195	23,908
Income taxes	8,278	8,738
Net income	$ 21,917	$ 15,170
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.40
Diluted earnings per common share (in dollars per share)	0.45	0.39
Dividends declared per share of common stock (in dollars per share)	$ 0.20	$ 0.18
Trust fees
Non-interest income:
Non-interest income	$ 7,514	$ 6,190
Remittance processing
Non-interest income:
Non-interest income	3,392	2,845
Fees for customer services
Non-interest income:
Non-interest income	$ 6,946	$ 5,986

CONSOLIDATED STATEMENTS OF OTHE

CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME
Net income	$ 21,917	$ 15,170
Unrealized net (losses) gains on securities:
Unrealized net holding (losses) gains arising during period	(8,754)	573
Reclassification adjustment for (gains) included in net income		(857)
Other comprehensive loss, before tax	(8,754)	(284)
Income tax benefit related to items of other comprehensive income	(2,495)	(113)
Other comprehensive loss, net of tax	(6,259)	(171)
Comprehensive income	$ 15,658	$ 14,999

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (loss)	Treasury Stock	Total
Balance at Dec. 31, 2016	$ 39	$ 781,716	$ (163,689)	$ 36	$ (23,788)	$ 594,314
Increase (decrease) in shareholders' equity
Net income			15,170			15,170
Other comprehensive loss				(171)		(171)
Issuance of treasury stock for employee stock purchase plan		(239)			439	200
Net issuance of treasury stock for restricted stock unit vesting and related tax benefit		(1,017)			914	(103)
Net issuance of stock options exercised, net of shares redeemed		(681)			818	137
Cash dividends common stock at $0.20 and $0.18 per share for three months ended March 31, 2018 and 2017 respectively			(6,879)			(6,879)
Stock dividend equivalents restricted stock units at $0.20 and $0.18 per share for three months ended March 31, 2018 and 2017 respectively		103	(103)
Stock dividend accrued on restricted stock awards assumed with the Pulaski Financial Corp. acquisition at $0.18 per share for three months ended March 31, 2017			(6)			(6)
Return of 28,648 equity trust shares					(860)	(860)
Stock-based compensation		545				545
Balance at Mar. 31, 2017	39	780,427	(155,507)	(135)	(22,477)	602,347
Balance at Dec. 31, 2017	49	1,084,889	(132,122)	(2,810)	(15,003)	935,003
Increase (decrease) in shareholders' equity
Net income			21,917			21,917
Other comprehensive loss				(6,259)		(6,259)
Tax Cuts and Jobs Act ("TCJA") of 2017 reclassification			605	(605)
Issuance of treasury stock for employee stock purchase plan		(248)			494	246
Net issuance of stock options exercised, net of shares redeemed		(1,206)			1,336	130
Cash dividends common stock at $0.20 and $0.18 per share for three months ended March 31, 2018 and 2017 respectively			(9,739)			(9,739)
Stock dividend equivalents restricted stock units at $0.20 and $0.18 per share for three months ended March 31, 2018 and 2017 respectively		128	(128)
Stock-based compensation		848				848
Balance at Mar. 31, 2018	$ 49	$ 1,084,411	$ (119,467)	$ (9,674)	$ (13,173)	$ 942,146

CONSOLIDATED STATEMENTS OF STO7

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Cash dividends, common stock (in dollars per share)	$ 0.20	$ 0.18
Stock dividends, restricted stock units (in dollars per share)	$ 0.20	0.18
Stock dividends, accrued restricted stock awards (in dollars per share)		$ 0.18
Return of equity trust shares		28,648

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Cash Flows from Operating Activities
Net income	$ 21,917	$ 15,170
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based and non-cash compensation	848	545
Depreciation	2,384	1,949
Amortization of intangible assets	1,515	1,207
Provision for loan losses	1,008	500
Provision for deferred income taxes	3,172	1,053
Amortization of security premiums and discounts, net	2,324	1,334
Accretion of premiums and discounts on time deposits and trust preferred securities, net	(12)	(99)
Accretion of premiums and discounts on portfolio loans, net	(3,398)	(1,748)
Security gains, net		(857)
Gain on sales of mortgage loans, net of origination costs	(2,093)	(13,964)
Mortgage loans originated for sale	(97,138)	(325,525)
Proceeds from sales of mortgage loans	165,045	493,621
Net losses (gains) on disposition of premises and equipment	52	(4)
Increase in cash surrender value of bank owned life insurance	(726)	(348)
Change in assets and liabilities:
Decrease in other assets	2,845	14,372
Decrease in other liabilities	(10,401)	(6,943)
Increase (decrease) in interest payable	1,550	(94)
Decrease in income taxes receivable	4,421	6,401
Net cash provided by operating activities before activities	93,313	186,570
Cash Flows from Investing Activities
Proceeds from sales of securities classified available for sale		121,993
Proceeds from maturities of securities classified available for sale	43,066	47,872
Proceeds from maturities of securities classified held to maturity	8,012	874
Purchase of securities classified available for sale	(2,164)	(64,619)
Purchase of securities classified held to maturity	(24,868)	(43,126)
Change in equity securities, net	350
Net (increase) decrease in portfolio loans	(10,844)	13,396
Proceeds from disposition of premises and equipment		44
Proceeds from sale of other real estate owned ("OREO") properties	639	3,229	$ 5,024
Purchases of premises and equipment	(4,508)	(2,095)
Proceeds from the redemption of Federal Home Loan Bank ("FHLB") stock, net	4,864	6,365
Net cash provided by investing activities	14,547	83,933
Cash Flows from Financing Activities
Net increase (decrease) in certificates of deposit	72,764	(23,588)
Net increase in demand, money market and savings deposits	132,493	134,967
Net decrease in securities sold under agreements to repurchase	(69,255)	(26,076)
Repayment of short-term borrowings	(220,000)	(75,000)
Cash dividends paid	(9,739)	(6,879)
Value of shares surrendered upon vesting to satisfy tax withholding obligations of stock-based compensation		(1,259)
Proceeds from stock options exercised	130	137
Net cash (used in) provided by financing activities	(93,607)	2,302
Net increase in cash and cash equivalents	14,253	272,805
Cash and cash equivalents, beginning of period	353,272	166,706	166,706
Cash and cash equivalents, ending of period	367,525	439,511	$ 353,272
Cash payments for:
Interest	7,325	3,008
Income taxes		58
Non-cash investing and financing activities:
Real estate acquired in settlement of loans	$ 348	$ 190

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Basis of Presentation
Basis of Presentation	Note 1: Basis of Presentation The accompanying unaudited Consolidated Financial Statements of First Busey Corporation and its subsidiaries (“First Busey,” “Company,” “we,” or “our”), a Nevada corporation, have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial information and with the instructions to Form 10-Q, and do not include certain information and footnote disclosures required by U.S. generally accepted accounting principles (“GAAP”) for complete Annual Financial Statements. Accordingly, these Financial Statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 on file with the SEC. The accompanying Consolidated Balance Sheet as of December 31, 2017, which has been derived from audited Financial Statements, and the unaudited Consolidated Financial Statements have been prepared in accordance with GAAP and reflect all adjustments that are, in the opinion of management, necessary for the fair presentation of the financial position and results of operations as of the dates and for the periods presented. All such adjustments are of a normal recurring nature. The results of operations for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The Company records revenue from contracts with customers in accordance with Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers” (“Topic 606”). Topic 606 establishes principles for reporting information about the timing, nature, amount and uncertainty of revenue arising from the Company’s contracts to provide goods or services to customers. The Company’s revenue is comprised of net interest income, which is explicitly excluded from the scope of Topic 606, and non-interest income. The Company has evaluated its non-interest income and the nature of its contracts with customers and determined that further disaggregation of revenue beyond what is presented in the accompanying unaudited Consolidated Financial Statements was not necessary. The Company generally fully satisfies its performance obligations on its contracts with customers as services are rendered so there is limited judgement involved in applying Topic 606 that significantly affects the determination of the timing and amount of revenue from contracts with customers. Descriptions of the Company’s primary revenue generating activities that are within Topic 606, and are presented in the accompanying unaudited Consolidated Statements of Income as components of non-interest income, include trust fees, commission and brokers’ fees, net, remittance processing, and fees for customer services. Trust fees and commission and brokers’ fees, net, represents monthly fees due from wealth management customers as consideration for managing the customers’ assets. Wealth management and trust services include custody of assets, investment management, fees for trust services and other fiduciary activities. Also included are fees received from a third party broker-dealer as part of a revenue sharing agreement for fees earned from customers that the Company refers to the third party. Revenue is recognized when the performance obligation is completed, which is generally monthly. Remittance processing represents transaction-based fees for pay processing solutions such as online bill payments, lockbox and walk-in payments. Revenue is recognized when the performance obligation is completed, which is generally monthly. Fees for customer services represents general service fees for monthly account maintenance and activity or transaction-based fees and consists of transaction-based revenue, time-based revenue, or item-based revenue. Revenue is recognized when the performance obligation is completed which is generally monthly for account maintenance services or when a transaction has been completed. Payment for such performance obligations are generally received at the time the performance obligations are satisfied. On July 2, 2017, First Busey acquired First Community Financial Partners, Inc., an Illinois corporation (“First Community”), and its wholly-owned bank subsidiary, First Community Financial Bank. First Busey operated First Community Financial Bank as a separate bank subsidiary from July 3, 2017 until November 3, 2017, when it was merged with and into Busey Bank. At that time, First Community Financial Bank’s banking centers became banking centers of Busey Bank. On October 1, 2017, First Busey acquired Mid Illinois Bancorp, Inc., an Illinois corporation (“Mid Illinois”) and its wholly-owned bank subsidiary, South Side Trust & Savings Bank of Peoria (“South Side Bank”). First Busey operated South Side Bank as a separate bank subsidiary from October 2, 2017 until March 16, 2018, when it was merged with and into Busey Bank. At that time, South Side Bank’s banking centers became banking centers of Busey Bank. Their operating results are included in the Company’s Financial Statements since each date of acquisition. The Consolidated Financial Statements include the accounts of the Company and its subsidiaries. All material intercompany transactions and balances have been eliminated in consolidation. Certain prior-year amounts have been reclassified to conform to the current presentation with no effect on net income or stockholders’ equity. In preparing the accompanying unaudited Consolidated Financial Statements, the Company’s management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the Financial Statements and the reported amounts of revenues and expenses for the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the fair value of available for sale investment securities, the fair value of assets acquired and liabilities assumed in business combinations and the determination of the allowance for loan losses. The Company has evaluated subsequent events for potential recognition and/or disclosure through the date the unaudited Consolidated Financial Statements included in this Quarterly Report on Form 10-Q were issued. There were no significant subsequent events for the quarter ended March 31, 2018 through the issuance date of these unaudited Consolidated Financial Statements that warranted adjustment to or disclosure in the unaudited Consolidated Financial Statements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2018
Acquisitions
Acquisitions	Note 2: Acquisitions First Community Financial Partners, Inc. On July 2, 2017, the Company completed its acquisition of First Community, which was headquartered in Joliet, Illinois. Founded in 2004, First Community operated nine banking centers in Will, DuPage and Grundy Counties, which encompass portions of the southwestern suburbs of Chicago. The operating results of First Community are included with the Company’s results of operations since the date of acquisition. First Busey operated First Community Financial Bank as a separate subsidiary from July 3, 2017 until November 3, 2017, when it was merged with and into Busey Bank. At that time, First Community Financial Bank’s banking centers became banking centers of Busey Bank. Under the terms of the merger agreement with First Community, at the effective time of the acquisition, each share of First Community common stock issued and outstanding was converted into the right to receive 0.396 shares of the Company’s common stock, cash in lieu of fractional shares and $1.35 cash consideration per share. The market value of the 7.2 million shares of First Busey common stock issued at the effective time of the acquisition was approximately $211.1 million based on First Busey’s closing stock price of $29.32 on June 30, 2017. In addition, certain options to purchase shares of First Community common stock that were outstanding at the acquisition date were converted into options to purchase shares of First Busey common stock, adjusted for the 0.44 option exchange ratio, and the fair value was included in the purchase price. Further, the purchase price included cash payouts relating to unconverted stock options and restricted stock units outstanding as of the acquisition date. This transaction was accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged 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 July 2, 2017 as additional information regarding the closing date fair values become available; however, the Company does not expect any further adjustments will be necessary. The total consideration paid, which was used to determine the amount of goodwill resulting from the transaction, also included the fair value of outstanding First Community stock options that were converted into options to purchase common shares of First Busey and cash paid out relating to stock options and restricted stock units not converted. As the total consideration paid for First Community exceeded the net assets acquired, goodwill of $116.0 million was recorded as a result of the acquisition. Goodwill recorded in the transaction, which reflected the synergies expected from the acquisition and the greater revenue opportunities from the Company’s broader service capabilities in the Chicagoland area, is not tax deductible, and was assigned to the Banking operating segment. First Busey incurred $0.1 million and $0.6 million of pre-tax expenses related to the acquisition of First Community for the three months ended March 31, 2018 and 2017, respectively, primarily for professional and legal fees, all of which are reported as a component of non-interest expense in the accompanying unaudited Consolidated Financial Statements. The following table presents the fair value estimates of First Community assets acquired and liabilities assumed as of July 2, 2017 (dollars in thousands) : As Recorded by Assets acquired: Cash and cash equivalents $ Securities Loans held for sale Portfolio loans Premises and equipment OREO Other intangible assets Other assets Total assets acquired Liabilities assumed: Deposits Other borrowings Other liabilities Total liabilities assumed Net assets acquired $ Consideration paid: Cash $ Cash payout of options and restricted stock units Common stock Fair value of stock options assumed Total consideration paid Goodwill $ The loans acquired in this transaction were recorded at fair value with no carryover of any existing allowance for loan losses. Loans that were not deemed to be credit-impaired at the acquisition date were accounted for under Financial Accounting Standards Board (“FASB”) ASC 310-20, Receivables-Nonrefundable Fees and Other Costs , and were subsequently considered as part of the Company’s determination of the adequacy of the allowance for loan losses. Purchased credit-impaired (“PCI”) loans were accounted for under ASC 310-30, Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality . As of the acquisition date, the aggregate principal outstanding and aggregate fair value of the acquired performing loans, including loans held for sale, both rounded to $1.1 billion. The difference between the aggregate principal balance outstanding and aggregate fair value of $14.4 million is expected to be accreted over the estimated four year remaining life of the respective loans in a manner that approximates the level yield method. As of the acquisition date, the aggregate principal balance outstanding of PCI loans totaled $17.9 million and the aggregate fair value of PCI loans totaled $12.5 million, which became such loans’ new carrying value. At March 31, 2018, PCI loans related to this transaction with a carrying value of $5.1 million were outstanding, with the decrease relating to collections. For PCI loans, the difference between contractually required payments at the acquisition date and the cash flow expected to be collected is referred to as the non-accretable difference. Further, the excess of cash flows expected at acquisition over the fair value is referred to as the accretable yield. The accretable yield, as of the acquisition date, of $0.6 million on PCI loans was expected to be recognized over the estimated four year remaining life of the respective loans in a manner that approximates the level yield method; however, $0.2 million was accelerated in 2017 as a result of collections. The following table provides the unaudited pro forma information for the results of operations for the three months ended March 31, 2017, as if the acquisition had occurred January 1, 2017. The pro forma results combine the historical results of First Community into the Company’s unaudited Consolidated Statements of Income, including the impact of purchase accounting adjustments for loan discount accretion, intangible assets amortization and deposit accretion, net of taxes. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2017. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, expense efficiencies or asset dispositions. Only the merger related expenses that have been recognized are included in net income in the table below (dollars in thousands, except per share amount) : Pro Forma Three Months Ended March 31, 2017 Total revenues (net interest income plus non-interest income) $ Net income Diluted earnings per common share Mid Illinois Bancorp, Inc. On October 1, 2017, the Company completed its acquisition of Mid Illinois, under which each share of Mid Illinois common stock issued and outstanding as of the effective time was converted into, at the election of the stockholder the right to receive, either (i) $227.94 in cash, (ii) 7.5149 shares of the Company’s common stock, or (iii) mixed consideration of $68.38 in cash and 5.2604 shares of the Company’s common stock, subject to certain adjustments and proration. In the aggregate, total consideration consisted of 70% stock and 30% cash. Mid Illinois stockholders electing the cash consideration option were subject to proration under the terms of the merger agreement with Mid Illinois and ultimately received a mixture of cash and stock consideration. First Busey operated South Side Bank as a separate bank subsidiary from October 2, 2017 until March 16, 2018, when it was merged with and into Busey Bank. At that time, South Side Bank’s banking centers became banking centers of Busey Bank. This transaction was accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at their estimated fair values on the date of acquisition. An adjustment to the fair value was recorded in the first quarter of 2018 as additional information became available. Fair values are subject to refinement for up to one year after the closing date of October 1, 2017; however, the Company does not expect any further adjustments will be necessary. As the total consideration paid for Mid Illinois exceeded the net assets acquired, goodwill of $48.9 million was recorded as a result of the acquisition. Goodwill recorded in the transaction, which reflected the synergies expected from the acquisition and expansion within the greater Peoria area, is not tax deductible, and was assigned to the Banking operating segment. First Busey incurred $3.0 million of pre-tax expenses related to the acquisition of Mid Illinois for the three months ended March 31, 2018, primarily for salaries, wages and employee benefits expense, professional and legal fees and data conversion expenses, all of which are reported as a component of non-interest expense in the accompanying unaudited Consolidated Financial Statements. First Busey incurred $0.1 million of pre-tax expenses related to the acquisition of Mid Illinois for the three months ended March 31, 2017, primarily for legal fees, all of which are reported as a component of non-interest expense in the accompanying unaudited Consolidated Financial Statements. The following table presents the fair value estimates of Mid Illinois assets acquired and liabilities assumed as of October 1, 2017 (dollars in thousands): As Recorded by Assets acquired: Cash and cash equivalents $ Securities Loans held for sale Portfolio loans Premises and equipment Goodwill — Other intangible assets Other assets Total assets acquired Liabilities assumed: Deposits Other borrowings Other liabilities Total liabilities assumed Net assets acquired $ Consideration paid: Cash $ Common stock Total consideration paid Goodwill $ The loans acquired in this transaction were recorded at fair value with no carryover of any existing allowance for loan losses. Loans that were not deemed to be credit-impaired at the acquisition date were accounted for under FASB ASC 310-20, Receivables-Nonrefundable Fees and Other Costs , and were subsequently considered as part of the Company’s determination of the adequacy of the allowance for loan losses. PCI loans were accounted for under ASC 310-30, Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality . As of the acquisition date, the aggregate principal outstanding was $362.4 million and aggregate fair value of the acquired performing loans was $357.0 million, including loans held for sale. The difference between the aggregate principal balance outstanding and aggregate fair value of $5.4 million is expected to be accreted over the estimated four year remaining life of the respective loans in a manner that approximates the level yield method. As of the acquisition date, the aggregate principal balance outstanding of PCI loans totaled $7.6 million and the aggregate fair value of PCI loans totaled $4.7 million, which became such loans’ new carrying value. At March 31, 2018, PCI loans related to this transaction with a carrying value of $0.9 million were outstanding, with the decrease primarily relating to a loan sale. For PCI loans, the difference between contractually required payments at the acquisition date and the cash flow expected to be collected is referred to as the non-accretable difference. Further, the excess of cash flows expected at acquisition over the fair value is referred to as the accretable yield. The accretable yield, as of the acquisition date, of $0.1 million on PCI loans was expected to be recognized over the estimated four year remaining life of the respective loans in a manner that approximates the level yield method.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Recent Accounting Pronouncements
Recent Accounting Pronouncements	Note 3: Recent Accounting Pronouncements Accounting Standards Update (“ASU”) 2014-09 , “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 outlines a single model for companies to use in accounting for revenue arising from contracts with customers and supersedes most prior revenue recognition guidance, including industry-specific guidance. ASU 2014-09 requires that companies recognize revenue based on the value of transferred goods or services as they occur in the contract and also requires additional disclosures. The Company’s revenue is comprised of net interest income, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. The adoption of this guidance on January 1, 2018 did not change the method in which non-interest income is recognized therefore a cumulative effect adjustment to retained earnings was not necessary. Additional disclosures related to revenue recognition appears in “Note 1: Basis of Presentation.” ASU 2016-01, “Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 is intended to improve the recognition and measurement of financial instruments by, among other things, requiring: equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; separate presentation of financial assets and financial liabilities by measurement category and form of financial assets; eliminating the requirement to disclose the method and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost on the Balance Sheet; and requiring an entity to present separately in other comprehensive income (loss) the portion of the total change in fair value of a liability resulting from the change in the instrument-specific credit risk when the fair value option has been elected for the liability. ASU 2016-01 was effective on January 1, 2018 and the adoption of this guidance resulted in separate classification of equity securities previously included in available for sale securities on the Consolidated Financial Statements. There was no cumulative effect adjustment recorded with the adoption of this guidance. ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 intends to increase transparency and comparability among organizations by recognizing all lease transactions (with terms in excess of 12 months) on the Consolidated Balance Sheet as a lease liability and a right-of-use asset. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing and uncertainty of cash flows arising from leases. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those fiscal years. Upon adoption, the lessee will apply the new standard retrospectively to all periods presented or retrospectively using a cumulative effect adjustment in the year of adoption. The Company is evaluating the impact this guidance will have on its Consolidated Financial Statements and related disclosures. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee. ASU 2016-13, “Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 implements a comprehensive change in estimating impairment from the current model of losses inherent in loans and securities held to maturity. This current expected credit loss model is expected to result in earlier recognition of losses. ASU 2016-13 will be effective in the first quarter of 2020. The Company’s implementation team is analyzing the provisions of ASU 2016-13, including evaluating the impact this guidance will have on its Consolidated Financial Statements and related disclosures. ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 is intended to simplify goodwill impairment testing by eliminating the second step of the analysis. ASU 2017-04 requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit’s fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. This guidance is effective for annual and interim periods beginning after December 15, 2019, with early adoption permitted. The Company does not expect this guidance to have a material impact on its Consolidated Financial Statements. ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities.” ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium, requiring the premium to be amortized to the earliest call date. ASU 2017-08 does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The Company does not expect this guidance to have a material impact on its Consolidated Financial Statements. ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” ASU 2017-12 amends Topic 815 to reduce the cost and complexity of applying hedge accounting and expand the types of relationships that qualify for hedge accounting. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness, requires all items that affect earnings to be presented in the same income statement line as the hedged item, provides new alternatives for applying hedge accounting to additional hedging strategies and measuring the hedged item in fair value hedges of interest rate risk, and expects to reduce the cost and complexity of applying hedge accounting by easing the requirements for effective testing, hedge documentation and application of the critical terms match method, and reducing the risk of material error corrections if a company applies the shortcut method incorrectly. This guidance is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The Company does not expect this guidance to have a material impact on its Consolidated Financial Statements. ASU 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” was issued in February 2018. ASU 2018-02 allows companies to make a one-time reclassification from accumulated other comprehensive income (loss) to retained earnings for the effects of remeasuring deferred tax liabilities and assets originally recorded in other comprehensive income as a result of the change in the federal tax rate by the TCJA. The Company adopted this guidance in the first quarter of 2018 with no impact on total stockholders’ equity or net income.

Securities

Securities	3 Months Ended
	Mar. 31, 2018
Securities
Securities	Note 4: Securities The Company held equity securities, consisting of common stock and money market mutual funds, with fair values of $5.0 million and $5.4 million at March 31, 2018 and December 31, 2017, respectively. Money market mutual fund balances were $4.3 million and $4.6 million at March 31, 2018 and December 31, 2017, respectively. There was $0.1 million of unrealized losses recorded in non-interest income in the accompanying unaudited Consolidated Financial Statements during the three months ended March 31, 2018 on the common stock. There were no sales of equity securities during the three months ended March 31, 2018. Securities are classified as available for sale when First Busey may decide to sell those securities due to changes in market interest rates, liquidity needs, changes in yields on alternative investments, and for other reasons. They are carried at fair value with unrealized gains and losses, net of taxes, reported in other comprehensive income. Securities are classified as held to maturity when First Busey has the ability and management has the intent to hold those securities to maturity. Accordingly, they are stated at cost, adjusted for amortization of premiums and accretion of discounts. The amortized cost, unrealized gains and losses and fair values of securities are summarized as follows (dollars in thousands) : Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value March 31, 2018: Available for sale U.S. Treasury securities $ $ $ ) $ Obligations of U.S. government corporations and agencies (1) — ) Obligations of states and political subdivisions ) Residential mortgage-backed securities ) Corporate debt securities ) Total $ $ $ ) $ Held to maturity Obligations of states and political subdivisions $ $ $ ) $ Commercial mortgage-backed securities ) Residential mortgage-backed securities — ) Total $ $ $ ) $ (1) The gross unrealized gains on obligations of U.S. government corporations and agencies was less than one thousand dollars. Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value December 31, 2017: Available for sale U.S. Treasury securities $ $ $ ) $ Obligations of U.S. government corporations and agencies ) Obligations of states and political subdivisions ) Residential mortgage-backed securities ) Corporate debt securities ) Total $ ) Held to maturity Obligations of states and political subdivisions $ $ $ ) $ Commercial mortgage-backed securities ) Residential mortgage-backed securities ) Total $ $ $ ) $ The amortized cost and fair value of debt securities as of March 31, 2018, by contractual maturity or pre-refunded date, are shown below. Mortgages underlying mortgage-backed securities may be called or prepaid; therefore, actual maturities could differ from the contractual maturities. All mortgage-backed securities were issued by U.S. government agencies and corporations (dollars in thousands) . Available for sale Held to maturity Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ $ $ $ Due after one year through five years Due after five years through ten years Due after ten years Total $ $ $ $ Realized gains and losses related to sales of securities are summarized as follows ( dollars in thousands ): Three Months Ended March 31, 2018 2017 Gross security gains $ — $ Gross security (losses) — ) Security gains, net $ — $ The tax provision for the net realized gains and losses was $0.3 million for the three months ended March 31, 2017. Investment securities with carrying amounts of $581.2 million and $638.2 million on March 31, 2018 and December 31, 2017, respectively, were pledged as collateral for public deposits, securities sold under agreements to repurchase and for other purposes as required or permitted by law. Information pertaining to securities with gross unrealized losses at March 31, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows ( dollars in thousands ): Continuous unrealized Continuous unrealized Total, gross Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses March 31, 2018: Available for sale U.S. Treasury securities $ $ ) $ — $ — $ $ ) Obligations of U.S. government corporations and agencies ) ) ) Obligations of states and political subdivisions ) ) ) Residential mortgage-backed securities ) ) ) Corporate debt securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) Held to maturity Obligations of states and political subdivisions(1) $ $ ) $ $ — $ $ ) Commercial mortgage-backed securities ) ) ) Residential mortgage-backed securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) (1) Continuous unrealized losses existing for greater than 12 months, gross was less than one thousand dollars. Continuous unrealized Continuous unrealized Total, gross Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses December 31, 2017: Available for sale U.S. Treasury securities $ $ ) $ — $ — $ $ ) Obligations of U.S. government corporations and agencies ) ) ) Obligations of states and political subdivisions ) ) ) Residential mortgage-backed securities ) ) ) Corporate debt securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) Held to maturity Obligations of states and political subdivisions $ $ ) $ — $ — $ $ ) Commercial mortgage-backed securities ) ) ) Residential mortgage-backed securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) Securities are periodically evaluated for other-than-temporary impairment (“OTTI”). The total number of securities in the investment portfolio in an unrealized loss position as of March 31, 2018 was 841, and represented a loss of 1.92% of the aggregate carrying value. As of March 31, 2018, the Company does not intend to sell such securities and it is more-likely-than-not that the Company will recover the amortized cost prior to being required to sell the securities. Full collection of the amounts due according to the contractual terms of the securities is expected; therefore, the Company does not consider these investments to be OTTI at March 31, 2018. The Company had available for sale obligations of state and political subdivisions with a fair value of $261.0 million and $280.2 million as of March 31, 2018 and December 31, 2017, respectively. In addition, the Company had held to maturity obligations of state and political subdivisions with a fair value of $40.4 million and $41.5 million as of March 31, 2018 and December 31, 2017, respectively. As of March 31, 2018, the fair value of the Company’s obligations of state and political subdivisions portfolio was comprised of $252.6 million of general obligation bonds and $48.8 million of revenue bonds issued by 430 issuers, primarily consisting of states, counties, cities, towns, villages and school districts. The Company held investments in general obligation bonds in 36 states (including the District of Columbia), including eight states in which the aggregate fair value exceeded $5.0 million. The Company held investments in revenue bonds in 22 states, including three states where the aggregate fair value exceeded $5.0 million. As of December 31, 2017, the fair value of the Company’s obligations of state and political subdivisions portfolio was comprised of $271.7 million of general obligation bonds and $50.0 million of revenue bonds issued by 446 issuers, primarily consisting of states, counties, cities, towns, villages and school districts. The Company held investments in general obligation bonds in 36 states (including the District of Columbia), including nine states in which the aggregate fair value exceeded $5.0 million. The Company held investments in revenue bonds in 22 states, including three states where the aggregate fair value exceeded $5.0 million. The amortized cost and fair values of the Company’s portfolio of general obligation bonds are summarized in the following tables by the issuers’ state (dollars in thousands) : March 31, 2018: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Illinois $ $ $ Wisconsin Texas Michigan Ohio Pennsylvania New Jersey Missouri Other Total general obligations bonds $ $ $ December 31, 2017: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Illinois $ $ $ Wisconsin Texas Michigan Ohio Pennsylvania New Jersey Missouri Minnesota Other Total general obligations bonds $ $ $ The general obligation bonds are diversified across many issuers, with $4.0 million being the largest exposure to a single issuer at March 31, 2018 and December 31, 2017. Accordingly, as of March 31, 2018 and December 31, 2017, the Company did not hold general obligation bonds of any single issuer, the aggregate book or market value of which exceeded 10% of the Company’s stockholders’ equity. Of the general obligation bonds in the Company’s portfolio, 99.3% had been rated by at least one nationally recognized statistical rating organization and 0.7% were unrated, based on the aggregate fair value as of March 31, 2018 and December 31, 2017. The amortized cost and fair values of the Company’s portfolio of revenue bonds are summarized in the following tables by the issuers’ state (dollars in thousands) : March 31, 2018: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Indiana $ $ $ Missouri Illinois Other Total revenue bonds $ $ $ December 31, 2017: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Indiana $ $ $ Missouri Illinois Other Total revenue bonds $ $ $ The revenue bonds are diversified across many issuers and revenue sources with $3.5 million and $3.6 million being the largest exposure to a single issuer at each of March 31, 2018 and December 31, 2017, respectively. Accordingly, as of March 31, 2018 and December 31, 2017, the Company did not hold revenue bonds of any single issuer, the aggregate book or market value of which exceeded 10% of the Company’s stockholders’ equity. Of the revenue bonds in the Company’s portfolio, 99.4% had been rated by at least one nationally recognized statistical rating organization and 0.6% were unrated, based on the fair value as of March 31, 2018 and December 31, 2017. Some of the primary types of revenue bonds held in the Company’s portfolio include: primary education or government building lease rentals secured by ad valorem taxes, utility systems secured by utility system net revenues, housing authorities secured by mortgage loans or principal receipts on mortgage loans, secondary education secured by student fees/tuitions, and pooled issuances (i.e. bond bank) consisting of multiple underlying municipal obligors. At March 31, 2018, all of the Company’s obligations of state and political subdivision securities are owned by its subsidiary bank, which has adopted First Busey’s investment policy requiring that state and political subdivision securities purchased be investment grade. Such investment policy also limits the amount of rated state and political subdivision securities to an aggregate 100% of the subsidiary bank’s total capital (as defined by federal regulations) at the time of purchase and an aggregate 15% of total capital for unrated state and political subdivision securities issued by municipalities having taxing authority or located in counties/micropolitan statistical areas/metropolitan statistical areas in which an office is located. All securities in First Busey’s obligations of state and political subdivision securities portfolio are subject to periodic review. Factors that may be considered as part of monitoring of state and political subdivision securities include credit rating changes by nationally recognized statistical rating organizations, market valuations, third-party municipal credit analysis, which may include indicative information regarding the issuer’s capacity to pay, market and economic data and such other factors as are available and relevant to the security or the issuer such as its budgetary position and sources, strength and stability of taxes and/or other revenue.

Loans held for sale

Loans held for sale	3 Months Ended
	Mar. 31, 2018
Loans held for sale
Loans held for sale	Note 5: Loans held for sale Loans held for sale totaled $29.0 million and $94.8 million at March 31, 2018 and December 31, 2017, respectively. The amount of loans held for sale decreased from December 31, 2017, due to lower origination volumes. Loans held for sale generate net interest income until loans are delivered to investors, at which point mortgage revenue will be recognized. The following is a summary of mortgage revenue (dollars in thousands) : Three Months Ended 2018 2017 Premiums received on sales of mortgage loans, including fair value adjustments $ $ Less direct origination costs ) ) Less provisions to liability for loans sold ) ) Mortgage servicing revenues Mortgage revenue $ $

Portfolio loans

Portfolio loans	3 Months Ended
	Mar. 31, 2018
Portfolio loans
Portfolio loans	Note 6: Portfolio loans Distributions of portfolio loans were as follows (dollars in thousands) : March 31, December 31, Commercial $ $ Commercial real estate Real estate construction Retail real estate Retail other Portfolio loans $ $ Less allowance for loan losses Portfolio loans, net $ $ Net deferred loan origination costs included in the table above were $4.5 million as of March 31, 2018 and $4.1 million as of December 31, 2017. Net accretable purchase accounting adjustments included in the table above reduced loans by $20.7 million as of March 31, 2018 and $23.6 million as of December 31, 2017. The Company believes that making sound loans is a necessary and desirable means of employing funds available for investment. Recognizing the Company’s obligations to its stockholders, depositors, and to the communities it serves, authorized personnel are expected to seek to develop and make sound, profitable loans that resources permit and that opportunity affords. The Company maintains lending policies and procedures designed to focus lending efforts on the types, locations and duration of loans most appropriate for its business model and markets. While not specifically limited, the Company attempts to focus its lending on short to intermediate-term (0-7 years) loans in geographic areas within 125 miles of its lending offices. Loans might be originated outside of these areas, but such loans are generally residential mortgage loans originated for sale in the secondary market or are loans to existing customers of the Bank. The Company attempts to utilize government-assisted lending programs, such as the Small Business Administration and United States Department of Agriculture lending programs, when prudent. Generally, loans are collateralized by assets, primarily real estate, of the borrowers and guaranteed by individuals. The loans are expected to be repaid primarily from cash flows of the borrowers, or from proceeds from the sale of selected assets of the borrowers. Management reviews and approves the Company’s lending policies and procedures on a routine basis. The policies for legacy First Community and South Side Bank loans are similar in nature to Busey Bank’s policies and the Company is migrating such loan production towards the Busey Bank policies. Management routinely (at least quarterly) reviews the Company’s allowance for loan losses in conjunction with reports related to loan production, loan quality, concentrations of credit, loan delinquencies and non-performing and potential problem loans. The Company’s underwriting standards are designed to encourage relationship banking rather than transactional banking. Relationship banking implies a primary banking relationship with the borrower that includes, at a minimum, an active deposit banking relationship in addition to the lending relationship. Additional significant underwriting factors beyond location, duration, a sound and profitable cash flow basis and the borrower’s character include the quality of the borrower’s financial history, the liquidity of the underlying collateral and the reliability of the valuation of the underlying collateral. At no time is a borrower’s total borrowing relationship permitted to exceed the Company’s regulatory lending limit and the Company generally limits such relationships to amounts substantially less than the regulatory limit. Loans to related parties, including executive officers and directors of the Company and its subsidiaries, are reviewed for compliance with regulatory guidelines by the Company’s board of directors at least annually. The Company maintains an independent loan review department that reviews the loans for compliance with the Company’s loan policy on a periodic basis. In addition, the loan review department reviews the risk assessments made by the Company’s credit department, lenders and loan committees. Results of these reviews are presented to management and the audit committee at least quarterly. The Company’s lending activities can be summarized into five primary areas: commercial loans, commercial real estate loans, real estate construction loans, retail real estate loans, and retail other loans. A description of each of the lending areas can be found in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The significant majority of the Company’s portfolio lending activity occurs in its Illinois and Missouri markets, with the remainder in the Indiana and Florida markets. The Company utilizes a loan grading scale to assign a risk grade to all of its loans. A description of the general characteristics of each grade is as follows: · Pass- This category includes loans that are all considered strong credits, ranging from investment or near investment grade, to loans made to borrowers who exhibit credit fundamentals that exceed industry standards and loan policy guidelines and loans that exhibit acceptable credit fundamentals. · Watch- This category includes loans on management’s “Watch List” and is intended to be utilized on a temporary basis for a pass grade borrower where a significant risk-modifying action is anticipated in the near future. · Special mention- This category is for “Other Assets Specially Mentioned” loans that have potential weaknesses, which may, if not checked or corrected, weaken the asset or inadequately protect the Company’s credit position at some future date. · Substandard- This category includes “Substandard” loans, determined in accordance with regulatory guidelines, for which the accrual of interest has not been stopped. Assets so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. · Doubtful- This category includes “Doubtful” loans that have all the characteristics of a “Substandard” loan with additional factors that make collection in full highly questionable and improbable. Such loans are placed on non-accrual status and may be dependent on collateral with a value that is difficult to determine. All loans are graded at their inception. Most commercial lending relationships that are $1.0 million or less are processed through an expedited underwriting process. If the credit receives a pass grade, it is aggregated into a homogenous pool of either: $0.35 million or less, or $0.35 million to $1.0 million. These pools are monitored on a regular basis and reviewed annually. Most commercial loans greater than $1.0 million are included in a portfolio review at least annually. Commercial loans greater than $0.35 million that have a grading of special mention or worse are reviewed on a quarterly basis. Interim reviews may take place if circumstances of the borrower warrant a more timely review. Portfolio loans in the highest grades, represented by the pass and watch categories, totaled $5.3 billion at March 31, 2018 and December 31, 2017. Portfolio loans in the lowest grades, represented by the special mention, substandard and doubtful categories, totaled $223.0 million at March 31, 2018, compared to $193.8 million at December 31, 2017. The following table is a summary of risk grades segregated by category of portfolio loans (excluding accretable purchase accounting adjustments and non-posted and clearings) (dollars in thousands ): March 31, 2018 Pass Watch Special Substandard Doubtful Commercial $ $ $ $ $ Commercial real estate Real estate construction Retail real estate Retail other — Total $ $ $ $ $ December 31, 2017 Pass Watch Special Substandard Doubtful Commercial $ $ $ $ $ Commercial real estate Real estate construction Retail real estate Retail other — Total $ $ $ $ $ Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are placed on non-accrual status when, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. Loans may be placed on non-accrual status regardless of whether or not such loans are considered past due. When interest accrual is discontinued, all unpaid accrued interest is reversed. Interest income is subsequently recognized only to the extent cash payments are received in excess of the principal due. Loans may be returned to accrual status when all of the principal and interest amounts contractually due are brought current and future payments are reasonably assured. An analysis of portfolio loans that are past due and still accruing or on a non-accrual status is as follows (dollars in thousands) : March 31, 2018 Loans past due, still accruing 30-59 Days 60-89 Days 90+Days Non-accrual Commercial $ $ $ — $ Commercial real estate Real estate construction — — — Retail real estate Retail other Total $ $ $ $ December 31, 2017 Loans past due, still accruing 30-59 Days 60-89 Days 90+Days Non-accrual Commercial $ $ $ $ Commercial real estate — Real estate construction — — — Retail real estate Retail other — Total $ $ $ $ A loan is classified as impaired when, based on current information and events, it is probable the Company will be unable to collect scheduled principal and interest payments when due according to the terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Loans graded substandard or doubtful and loans classified as a troubled debt restructuring (“TDR”) are reviewed by the Company for potential impairment. Impairment is measured on a loan-by-loan basis for commercial and construction loans based on the present value of the expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. PCI loans are considered impaired. Large groups of smaller balance homogenous loans are collectively evaluated for impairment. Accordingly, the Company does not separately identify individual consumer and residential loans for impairment unless such loans are the subject of a restructuring agreement. The gross interest income that would have been recorded in the three months ended March 31, 2018 if impaired loans had been current in accordance with their original terms was $0.4 million. The amount of interest collected on those loans and recognized on a cash basis that was included in interest income was insignificant for the three months ended March 31, 2018. The Company’s loan portfolio includes certain loans that have been modified in a TDR, where concessions have been granted to borrowers who have experienced financial difficulties. The Company will restructure a loan for its customer after evaluating whether the borrower is able to meet the terms of the loan over the long term, though unable to meet the terms of the loan in the near term due to individual circumstances. The Company considers the customer’s past performance, previous and current credit history, the individual circumstances surrounding the customer’s current difficulties and the customer’s plan to meet the terms of the loan in the future prior to restructuring the terms of the loan. Generally, all five primary areas of lending are restructured through short-term interest rate relief, short-term principal payment relief, short-term principal and interest payment relief or forbearance (debt forgiveness). Once a restructured loan exceeds 90 days past due or is placed on non-accrual status, it is classified as non-performing. A summary of restructured loans as of March 31, 2018 and December 31, 2017 is as follows (dollars in thousands) : March 31, December 31, In compliance with modified terms $ $ 30 – 89 days past due Included in non-performing loans Total $ $ All TDRs are considered to be impaired for purposes of assessing the adequacy of the allowance for loan losses and for financial reporting purposes. When the Company modifies a loan in a TDR, it evaluates any possible impairment similar to other impaired loans based on present value of the expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. If the Company determines that the fair value of the TDR is less than the recorded investment in the loan, impairment is recognized through an allowance estimate in the period of the modification and in periods subsequent to the modification. There were no performing loans classified as a TDR during the three months ended March 31, 2018 and 2017. The gross interest income that would have been recorded in the three months ended March 31, 2018 and 2017 if performing TDRs had been performing in accordance with their original terms compared with their modified terms was insignificant. There were no TDRs that were entered into during the last twelve months that were subsequently classified as non-performing and had payment defaults (a default occurs when a loan is 90 days or more past due or transferred to non-accrual) during the three months ended March 31, 2018. There were no TDRs that were entered into during the prior twelve months that were subsequently classified as non-performing and had payment defaults during the three months ended March 31, 2017. The following tables provide details of impaired loans, segregated by category. The unpaid contractual principal balance represents the recorded balance prior to any partial charge-offs. The recorded investment represents customer balances net of any partial charge-offs recognized on the loan. The average recorded investment is calculated using the most recent four quarters (dollars in thousands ). March 31, 2018 Unpaid Recorded Recorded Total Related Average Commercial $ $ $ $ $ $ Commercial real estate Real estate construction — — Retail real estate Retail other — — Total $ $ $ $ $ $ December 31, 2017 Unpaid Recorded Recorded Total Related Average Commercial $ $ $ $ $ $ Commercial real estate Real estate construction — — Retail real estate Retail other — — Total $ $ $ $ $ $ Management’s evaluation as to the ultimate collectability of loans includes estimates regarding future cash flows from operations and the value of property, real and personal, pledged as collateral. These estimates are affected by changing economic conditions and the economic prospects of borrowers. Allowance for Loan Losses The allowance for loan losses represents an estimate of the amount of probable losses believed to be inherent in the Company’s loan portfolio at the Consolidated Balance Sheet date. The allowance for loan losses is calculated geographically, by class of loans. The allowance calculation involves a high degree of estimation that management attempts to mitigate through the use of objective historical data where available. Loan losses are charged against the allowance for loan losses when management believes the uncollectibility of the loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Overall, the Company believes the allowance methodology is consistent with prior periods and the balance was adequate to cover the estimated losses in the Company’s loan portfolio at March 31, 2018 and December 31, 2017. The general portion of the Company’s allowance contains two components: (i) a component for historical loss ratios, and (ii) a component for adversely graded loans. The historical loss ratio component is an annualized loss rate calculated using a sum-of-years digits weighted 20-quarter historical average. The Company’s component for adversely graded loans attempts to quantify the additional risk of loss inherent in the special mention and substandard portfolios. The substandard portfolio has an additional allocation of 3.00% placed on such loans, which is an estimate of the additional loss inherent in these loan grades based upon a review of overall historical charge-offs. As of March 31, 2018, the Company believed this reserve remained adequate. Special mention loans have an additional allocation of 1.0% placed on such loans, which is an estimate of the additional loss inherent in these loan grades. As of March 31, 2018, the Company believed this reserve remained adequate. The specific portion of the Company’s allowance relates to loans that are impaired, which includes non-performing loans, TDRs and other loans determined to be impaired. Impaired loans are excluded from the determination of the general allowance for non-impaired loans and are allocated specific reserves as discussed above. Impaired loans are reported at the fair value of the underlying collateral, less estimated costs to sell, if repayment is expected solely from the collateral. Collateral values are estimated using a combination of observable inputs, including recent appraisals discounted for collateral specific changes and current market conditions, and unobservable inputs based on customized discounting criteria. The general reserve quantitative allocation that is based upon historical charge off rates is adjusted for qualitative factors based on current general economic conditions and other qualitative risk factors both internal and external to the Company. In general, such valuation allowances are determined by evaluating, among other things: (i) Management & Staff; (ii) Loan Underwriting, Policy and Procedures; (iii) Internal/External Audit & Loan Review; (iv) Valuation of Underlying Collateral; (v) Macro and Local Economic Factors; (vi) Impact of Competition, Legal & Regulatory Issues; (vii) Nature and Volume of Loan Portfolio; (viii) Concentrations of Credit; (ix) Net Charge-Off Trends; and (x) Non-Accrual, Past Due and Classified Trends. Management evaluates the probable impact from the degree of risk that each one of these components has on the quality of the loan portfolio on a quarterly basis. Based on each component’s risk factor, a qualitative adjustment to the reserve may be applied to the appropriate loan categories. During the first quarter of 2018, the Company adjusted qualitative factors for Impact of Competition, Legal & Regulatory and Net Charge-Off Trends based on current analysis. The Company will continue to monitor its qualitative factors on a quarterly basis. The Company holds acquired loans 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 generally necessary to establish an allowance, which represents an amount that, in management’s opinion, will be adequate to absorb probable credit losses in such loans. The balance of all acquired loans which did not require a related allowance for loan losses as of March 31, 2018 totaled approximately $1.7 billion. The following table details activity in the allowance for loan losses. Allocation of a portion of the allowance to one category does not preclude its availability to absorb losses in other categories (dollars in thousands) : As of and for the Three Months Ended March 31, 2018 Commercial Commercial Real Estate Retail Real Retail Other Total Beginning balance $ $ $ $ $ $ Provision for loan loss ) Charged-off ) ) ) ) ) ) Recoveries Ending Balance $ $ $ $ $ $ As of and for the Three Months Ended March 31, 2017 Commercial Commercial Real Estate Retail Real Retail Other Total Beginning balance $ $ $ $ $ $ Provision for loan loss ) ) Charged-off ) ) — ) ) ) Recoveries Ending Balance $ $ $ $ $ $ The following table presents the allowance for loan losses and recorded investments in portfolio loans by category (dollars in thousands) : As of March 31, 2018 Commercial Commercial Real Estate Retail Real Retail Other Total Amount allocated to: Loans individually evaluated for impairment $ $ $ — $ $ — $ Loans collectively evaluated for impairment Ending Balance $ $ $ $ $ $ Loans: Loans individually evaluated for impairment $ $ $ $ $ $ Loans collectively evaluated for impairment PCI loans evaluated for impairment — Ending Balance $ $ $ $ $ $ As of December 31, 2017 Commercial Commercial Real Estate Retail Real Retail Other Total Amount allocated to: Loans individually evaluated for impairment $ $ $ — $ $ — $ Loans collectively evaluated for impairment Ending Balance $ $ $ $ $ $ Loans: Loans individually evaluated for impairment $ $ $ $ $ $ Loans collectively evaluated for impairment PCI loans evaluated for impairment — Ending Balance $ $ $ $ $ $

OREO

OREO	3 Months Ended
	Mar. 31, 2018
OREO
OREO	Note 7: OREO OREO represents properties acquired through foreclosure or other proceedings in settlement of loans and is included in other assets in the accompanying Consolidated Balance Sheets. OREO is held for sale and is recorded at the date of foreclosure at the fair value of the properties less estimated costs of disposal, which establishes a new cost basis. Any adjustment to fair value at the time of transfer to OREO is charged to the allowance for loan losses. Properties are evaluated regularly to ensure each recorded amount is supported by its current fair value, and valuation allowances to reduce the carrying amount due to subsequent declines in fair value less estimated costs to dispose are recorded as necessary. Revenue, expense, gains and losses from the operations of foreclosed assets are included in operations. At March 31, 2018, the Company held $0.7 million in commercial OREO, $0.3 million in residential OREO and an insignificant amount of other repossessed assets. At December 31, 2017, the Company held $1.2 million in commercial OREO, $0.1 million in residential OREO and an insignificant amount of other repossessed assets. At March 31, 2018 the Company had $2.0 million of residential real estate in the process of foreclosure. The following table summarizes activity related to OREO (dollars in thousands) : Three Months Ended Year Ended Beginning balance $ $ Additions, transfers from loans Additions, fair value from First Community acquisition — Additions, fair value from Mid Illinois acquisition — Proceeds from sales of OREO ) ) Gain on sales of OREO Valuation allowance for OREO — ) Ending balance $ $

Deposits

Deposits	3 Months Ended
	Mar. 31, 2018
Deposits
Deposits	Note 8: Deposits The composition of deposits is as follows (dollars in thousands) : March 31, 2018 December 31, 2017 Demand deposits, noninterest-bearing $ $ Interest-bearing transaction deposit Saving deposits and money market deposits Time deposits Total $ $ Interest-bearing transaction deposits included $48.2 million and $45.4 million of brokered transaction deposits, including reciprocal brokered deposits, at March 31, 2018 and December 31, 2017, respectively. Savings deposits and money market deposits included $127.3 million and $127.5 million of brokered deposits, including reciprocal brokered deposits, at March 31, 2018 and December 31, 2017, respectively. The aggregate amount of time deposits with a minimum denomination of $100,000 was approximately $570.8 million and $578.9 million at March 31, 2018 and December 31, 2017, respectively. The aggregate amount of time deposits with a minimum denomination that meets or exceeds the Federal Deposit Insurance Corporation (“FDIC”) insurance limit of $250,000 was approximately $224.1 million and $197.9 million at March 31, 2018 and December 31, 2017, respectively. The Company held reciprocal brokered time deposits of $59.1 million and $62.0 million at March 31, 2018 and December 31, 2017, respectively, included in the balance of time deposits. Further, the Company held brokered deposits of $250.0 million and $247.7 million at March 31, 2018 and December 31, 2017, respectively, which are included in the balance of time deposits. As of March 31, 2018, the scheduled maturities of time deposits, are as follows (dollars in thousands) : April 1, 2018 – March 31, 2019 $ April 1, 2019 – March 31, 2020 April 1, 2020 – March 31, 2021 April 1, 2021 – March 31, 2022 April 1, 2022 – March 31, 2023 Thereafter $

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2018
Borrowings
Borrowings	Note 9: Borrowings Securities sold under agreements to repurchase, which are classified as secured borrowings, generally mature either daily. Securities sold under agreements to repurchase are reflected at the amount of cash received in connection with the transaction. The underlying securities are held by the Company’s safekeeping agent. The Company may be required to provide additional collateral based on fluctuations in the fair value of the underlying securities. Short-term borrowings include FHLB advances which mature in less than one year from date of origination. On May 5, 2017, the Company entered into a second amendment to a credit agreement with a correspondent bank to extend a revolving loan facility to the Company in the maximum principal amount of $40.0 million, with an annual interest rate of 2.50% plus the one-month LIBOR rate, which had a maturity date of April 30, 2018. The Company had no outstanding amount on March 31, 2018 or December 31, 2017. On April 30, 2018, the Company entered into a third amendment to extend the maturity of this revolving loan facility from April 30, 2018 to April 30, 2019, decrease the maximum principal amount from $40.0 million to $20.0 million, and amend and restate the LIBOR rate definition to an annual interest rate of 1.75% plus the one-month LIBOR rate. The loan also bears a non-usage fee calculated based on the average daily principal balance of the loan outstanding during the prior fiscal quarter. The following table sets forth the distribution of securities sold under agreements to repurchase and short-term borrowings and weighted average interest rates (dollars in thousands) : March 31, December 31, Securities sold under agreements to repurchase Balance at end of period $ $ Weighted average interest rate at end of period % % Maximum outstanding at any month end in year-to-date period $ $ Average daily balance for the year-to-date period $ $ Weighted average interest rate during period(1) % % Short-term borrowings, FHLB advances Balance at end of period $ — $ Weighted average interest rate at end of period — % % Maximum outstanding at any month end in year-to-date period $ $ Average daily balance for the year-to-date period $ $ Weighted average interest rate during period(1) % % (1) The weighted average interest rate is computed by dividing total annualized interest for the year-to-date period by the average daily balance outstanding. Long-term debt is summarized as follows (dollars in thousands) : March 31, December 31, Notes payable, FHLB, ranging in original maturity from nineteen months to ten years, collateralized by FHLB deposits, residential and commercial real estate loans and FHLB stock. $ $ As of March 31, 2018, funds borrowed from the FHLB, listed above, consisted of variable-rate notes maturing through September 2024, with interest rates ranging from 1.40% to 1.71%. The weighted average rate on the long-term advances was 1.52% as of March 31, 2018. As of December 31, 2017, funds borrowed from the FHLB, listed above, consisted of variable-rate notes maturing through September 2024, with interest rates ranging from 1.10% to 1.32%. The weighted average rate on the long-term advances was 1.19% as of December 31, 2017. On May 25, 2017, the Company issued $40.0 million of 3.75% senior notes that mature on May 25, 2022. The senior notes are payable semi-annually on each May 25 and November 25, commencing on November 25, 2017. Additionally, on May 25, 2017, the Company issued $60.0 million of fixed-to-floating rate subordinated notes that mature on May 25, 2027. The subordinated notes, which qualify as Tier 2 capital for First Busey, are at an initial rate of 4.75% for five years and thereafter at an annual floating rate equal to three-month LIBOR plus a spread of 2.919%. The subordinated notes are payable semi-annually on each May 25 and November 25, commencing on November 25, 2017 during the five year fixed-term and thereafter each February 25, May 25, August 25 and November 25 of each year, commencing on August 25, 2022. The subordinated notes have an optional redemption in whole or in part on any interest payment date on or after May 25, 2022. The senior notes and subordinated notes are unsecured obligations of the Company. Unamortized debt issuance costs related to the senior notes and subordinated notes totaled $0.6 million and $0.9 million, respectively, at March 31, 2018. Unamortized debt issuance costs related to the senior notes and subordinated notes totaled $0.6 million and $1.0 million, respectively, at December 31, 2017. The Company used the net proceeds from the offering to finance a portion of the cash consideration for its acquisition of First Community, to redeem a portion of First Community subordinated debentures in July 2017, and to finance a portion of the cash consideration for its acquisition of Mid Illinois in October 2017, with the remaining proceeds to be used for general corporate purposes. In relation to the First Community acquisition, the Company assumed $15.3 million in subordinated debt, of which $9.8 million was simultaneously redeemed. The remaining $5.5 million was issued on September 30, 2013, matures on September 30, 2021 and bears interest payable quarterly, at an annual interest rate of 8.625%. Beginning on September 30, 2018, the Company may, at its option, redeem the note at a redemption price equal to the principal amount outstanding plus accrued but unpaid interest. A $0.3 million purchase accounting premium was recorded on the remaining subordinated debt.

Junior Subordinated Debt Owed t

Junior Subordinated Debt Owed to Unconsolidated Trusts	3 Months Ended
	Mar. 31, 2018
Junior Subordinated Debt Owed to Unconsolidated Trusts
Junior Subordinated Debt Owed to Unconsolidated Trusts	Note 10: Junior Subordinated Debt Owed to Unconsolidated Trusts First Busey maintains statutory trusts for the sole purpose of issuing and servicing trust preferred securities and related trust common securities. The proceeds from such issuances were used by the trusts to purchase junior subordinated notes of the Company, which are the sole assets of each trust. Concurrent with the issuance of the trust preferred securities, the Company issued guarantees for the benefit of the holders of the trust preferred securities. The trust preferred securities are instruments that qualify, and are treated by the Company, as Tier 1 regulatory capital. The Company owns all of the common securities of each trust. The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment. The Company had $71.0 million of junior subordinated debt owed to unconsolidated trusts at March 31, 2018 and December 31, 2017. The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at par value at the stated maturity date or upon redemption. Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated notes. The Company’s obligations under the junior subordinated notes and other relevant trust agreements, in aggregate, constitute a full and unconditional guarantee by the Company of each trust’s obligations under the trust preferred securities issued by each trust. The Company has the right to defer payment of interest on the notes, in which case the distributions on the trust preferred securities will also be deferred, for up to five years, but not beyond the stated maturity date. Under current banking regulations, bank holding companies are allowed to include qualifying trust preferred securities in their Tier 1 Capital for regulatory capital purposes, subject to a 25% limitation to all core (Tier 1) capital elements, net of goodwill and other intangible assets less any associated deferred tax liability. As of March 31, 2018, 100% of the trust preferred securities qualified as Tier 1 capital under the final rule adopted in March 2005. The Dodd-Frank Act mandated the Federal Reserve to establish minimum capital levels for holding companies on a consolidated basis as stringent as those required for FDIC-insured institutions. A result of this change is that the proceeds of hybrid instruments, such as trust preferred securities, are being excluded from capital over a phase-out period. However, if such securities were issued prior to May 19, 2010 by bank holding companies with less than $15.0 billion of assets, they may be retained, subject to certain restrictions. Because the Company has assets of less than $15.0 billion, it is able to maintain our trust preferred proceeds as capital, but the Company has to comply with new capital mandates in other respects and will not be able to raise capital in the future through the issuance of trust preferred securities.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Common Share
Earnings Per Common Share	Note 11: Earnings Per Common Share Earnings per common share have been computed as follows (in thousands, except per share data) : Three Months Ended 2018 2017 Net income $ $ Shares: Weighted average common shares outstanding Dilutive effect of outstanding options, warrants and restricted stock units as determined by the application of the treasury stock method Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation Basic earnings per common share $ $ Diluted earnings per common share $ $ Basic earnings per share are computed by dividing net income available to common stockholders for the period by the weighted average number of common shares outstanding, which include deferred stock units that are vested but not delivered. Diluted earnings per common share are computed using the treasury stock method and reflects the potential dilution that could occur if the Company’s outstanding stock options and warrants were exercised and restricted stock units were vested. Stock options, warrants and restricted stock units for which the exercise or the grant price exceeds the average market price over the period have an anti-dilutive effect and are excluded from the calculation. At March 31, 2018, 191,278 warrants were anti-dilutive and excluded from the calculation of common stock equivalents. At March 31, 2017, 10,850 outstanding options and 191,278 warrants were anti-dilutive and excluded from the calculation of common stock equivalents.

Share-based Compensation

Share-based Compensation	3 Months Ended
	Mar. 31, 2018
Share-based Compensation
Share-based Compensation	Note 12: Share-based Compensation The Company grants share-based compensation awards to its employees and members of its board of directors as provided for under the Company’s 2010 Equity Incentive Plan. In addition, pursuant to the terms of the First Community 2016 Equity Incentive Plan, the Company may grant awards with respect to First Busey common stock to legacy employees and directors of First Community or its subsidiaries. Permissible awards under the plan include, but are not limited to, non-qualified stock options, incentive stock options, stock appreciation rights, restricted stock and restricted stock units. The Company currently grants share-based compensation in the form of restricted stock units (“RSUs”) and deferred stock units (“DSUs”). The Company grants RSUs to members of management periodically throughout the year. Each RSU is equivalent to one share of the Company’s common stock. These units have a requisite service periods ranging from one to five years. The Company annually grants share-based awards in the form of DSUs, which are RSUs with a deferred settlement date, to its board of directors. Each DSU is equivalent to one share of the Company’s common stock. The DSUs vest on the first anniversary of the grant date or on the date of the next Annual Meeting of Stockholders, whichever is earlier. These units generally are subject to the same terms as RSUs under the Company’s 2010 Equity Incentive Plan or the First Community 2016 Equity Incentive Plan, except that, following vesting, settlement occurs within 30 days following the earlier of separation from the board or a change in control of the Company. Subsequent to vesting and prior to delivery, these units will continue to earn dividend equivalents. The Company also has outstanding stock options granted prior to 2011 and stock options assumed with previous acquisitions. Under the terms of the Company’s 2010 Equity Incentive Plan and the First Community 2016 Equity Incentive Plan, the Company is allowed, but not required, to source stock option exercises and grants of RSUs and DSUs from its inventory of treasury stock. As of March 31, 2018, the Company held 468,342 shares in treasury. On February 3, 2015, First Busey announced that its board of directors approved a repurchase plan under which the Company is authorized to repurchase up to an aggregate of 666,667 shares of its common stock. The repurchase plan has no expiration date and replaced the prior repurchase plan originally approved in 2008. During 2015, the Company purchased 333,333 shares under this repurchase plan. At March 31, 2018 the Company had 333,334 shares that may still be purchased under the plan. The Company’s 2010 Equity Incentive Plan is designed to encourage ownership of its common stock by its employees and directors, to provide additional incentive for them to promote the success of the Company’s business, and to attract and retain talented personnel. All of the Company’s employees and directors, and those of its subsidiaries, are eligible to receive awards under the plan. A description of the 2010 Equity Incentive Plan, which was amended in 2015, can be found in the Company’s Proxy Statement for the 2015 Annual Meeting of Stockholders. A description of the First Community 2016 Equity Incentive Plan can be found in the Proxy Statement of First Community Financial Partners, Inc. for the 2016 Annual Meeting of Stockholders. Stock Option Plan A summary of the status of and changes in the Company’s stock option awards for the three months ended March 31, 2018 follows: Weighted- Weighted- Average Average Exercise Remaining Contractual Shares Price Term Outstanding at beginning of year $ Exercised ) Forfeited ) Expired ) Outstanding at end of period $ Exercisable at end of period $ The Company recorded $0.1 million stock option compensation expense for the three months ended March 31, 2018 related to the converted options from First Community. The Company did not record any stock option compensation expense for the three months ended March 31, 2017. As of March 31, 2018, the Company had $0.4 million of unrecognized stock option expense. This cost is expected to be recognized over a period of 1.6 years. Restricted Stock Unit Plan A summary of the changes in the Company’s stock unit awards for the three months ended March 31, 2018, is as follows: Weighted- Director Weighted- Restricted Average Deferred Average Stock Grant Date Stock Grant Date Units Fair Value Units Fair Value Non-vested at beginning of year $ $ Granted — — — — Dividend equivalents earned Vested — — ) Forfeited ) — — Non-vested at end of period $ $ Outstanding at end of period $ $ Recipients earn quarterly dividend equivalents on their respective units which entitle the recipients to additional units. Therefore, dividends earned each quarter compound based upon the updated unit balances. Upon vesting/delivery, shares are expected (though not required) to be issued from treasury. The Company recognized $0.8 million and $0.5 million of compensation expense related to non-vested RSUs and DSUs for the three months ended March 31, 2018 and 2017, respectively. As of March 31, 2018, there was $7.7 million of total unrecognized compensation cost related to these non-vested RSUs and DSUs. This cost is expected to be recognized over a period of 3.4 years. As of March 31, 2018, 891,648 shares remain available for issuance pursuant to the Company’s 2010 Equity Incentive Plan, 78,690 shares remain available for issuance pursuant to the Company’s Employee Stock Purchase Plan and 313,939 shares remain available for issuance pursuant to the First Community 2016 Equity Incentive Plan.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Taxes
Income Taxes	Note 13: Income Taxes At March 31, 2018, the Company was not under examination by any tax authority.

Outstanding Commitments and Con

Outstanding Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Outstanding Commitments and Contingent Liabilities
Outstanding Commitments and Contingent Liabilities	Note 14: Outstanding Commitments and Contingent Liabilities Legal Matters The Company is a party to legal actions which arise in the normal course of its business activities. In the opinion of management, the ultimate resolution of these matters is not expected to have a material effect on the financial position or the results of operations of the Company. Credit Commitments and Contingencies The Company is a party to credit-related 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 commitments to extend credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the unaudited Consolidated Balance Sheets. The Company’s exposure to credit loss is represented by the contractual amount of those commitments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance-sheet instruments. A summary of the contractual amount of the Company’s exposure to off-balance-sheet risk relating to the Company’s commitments to extend credit and standby letters of credit follows ( dollars in thousands ): March 31, 2018 December 31, 2017 Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ $ Standby letters of credit Commitments to extend credit are agreements to lend to a customer as long as no condition established in the contract has been violated. These commitments are generally at variable interest rates and generally have fixed expiration dates or other termination clauses and may require payment of a fee. The commitments for equity lines of credit may expire without being drawn upon. Therefore, the total commitment amounts do not necessarily represent future cash requirements. The amount of collateral obtained, if it is deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the customer. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer’s obligation to a third-party. Those guarantees are primarily issued to support public and private borrowing arrangements, including bond financing and similar transactions and primarily have terms of one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company holds collateral, which may include accounts receivable, inventory, property and equipment, and income producing properties, supporting those commitments if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third-party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount shown in the summary above. If the commitment is funded, the Company would be entitled to seek recovery from the customer. As of March 31, 2018 and December 31, 2017, no amounts were recorded as liabilities for the Company’s potential obligations under these guarantees. Other Commitments From time to time, the Company will sign contracts for construction projects relating to the Company’s facilities.

Capital

Capital	3 Months Ended
	Mar. 31, 2018
Capital
Capital	N ote 15: Capital The ability of the Company to pay cash dividends to its stockholders and to service its debt was historically dependent on the receipt of cash dividends from its subsidiaries. Under applicable regulatory requirements, an Illinois state-chartered bank such as Busey Bank may not pay dividends in excess of its net profits. Because Busey Bank has been in a retained earnings deficit position since 2009, it has not been able to pay dividends since that time. With prior approval from its regulators, however, an Illinois state-chartered bank in this situation may be able to reduce its capital stock by amending its charter to decrease the authorized number of shares, and then make a subsequent distribution to its holding company. Using this approach, and with the approval of its regulators, Busey Bank has distributed funds to the Company, the most recent of which was $40.0 million on October 12, 2017. The Company expects to seek regulatory approval for additional capital distributions from Busey Bank in future periods until such time as Busey Bank is no longer in a retained earnings deficit. The Company and Busey Bank are subject to regulatory capital requirements administered by federal and/or state agencies that involve the quantitative measure of their assets, liabilities, and certain off-balance-sheet items, as calculated under regulatory accounting practices. Quantitative measures established by regulations to ensure capital adequacy require the Company and Busey Bank to maintain minimum dollar amounts and ratios of such to risk weighted assets (as defined in the regulations and set forth in the table below) of total capital, Tier 1 capital and Common Equity Tier 1 capital, and for the bank, Tier 1 capital to average assets. Failure to meet minimum capital requirements may cause regulatory bodies to initiate certain discretionary and/or mandatory actions that, if undertaken, could have a direct material effect on our unaudited Consolidated Financial Statements. The Company, as a financial holding company, is required to be “well capitalized” in the capital categories shown in the table below. As of March 31, 2018, the Company and Busey Bank met all capital adequacy requirements to which they were subject, including the guidelines to be considered “well capitalized.” The Dodd-Frank Act established minimum capital levels for bank holding companies on a consolidated basis. The components of Tier 1 capital are restricted to capital instruments that, at the time of signing, were considered to be Tier 1 capital for insured depository institutions. Under this legislation, the Company is able to maintain its trust preferred securities as Tier 1 capital, but it will have to comply with new capital mandates in other respects, and it will not be able to raise Tier 1 capital through the issuance of trust preferred securities in the future. In July 2013, the U.S. federal banking authorities approved the implementation of the Basel III Rule required by the Dodd-Frank Act. The Basel III Rule is applicable to all U.S. banks that are subject to minimum capital requirements, as well as to bank and savings and loan holding companies other than “small bank holding companies” (generally non-public bank holding companies with consolidated assets of less than $1.0 billion). The Basel III Rule not only increased most of the required minimum regulatory capital ratios, but they also introduced a new Common Equity Tier 1 Capital ratio and the concept of a capital conservation buffer. The Basel III Rule also expanded the definition of capital as in effect currently by establishing criteria that instruments must meet to be considered Additional Tier 1 Capital (Tier 1 Capital in addition to Common Equity) and Tier 2 Capital. A number of instruments that generally qualified as Tier 1 Capital under the old guidelines no longer qualify, or their qualifications will change, as the Basel III Rule is being fully implemented. The Basel III Rule also permitted banking organizations with less than $15.0 billion in assets to retain, through a one-time election, the past treatment for accumulated other comprehensive income (loss), which did not affect regulatory capital. First Busey and Busey Bank made this election in the first quarter of 2015 to avoid variations in the level of their capital depending on fluctuations in the fair value of their securities portfolio. The Basel III Rule maintained the general structure of the prompt corrective action framework, while incorporating increased requirements. The prompt corrective action guidelines were also revised to add the Common Equity Tier 1 Capital ratio. Under the final capital rules that became effective on January 1, 2015, there was a requirement for a Common Equity Tier 1 capital conservation buffer of 2.5% of risk weighted assets which is in addition to the other minimum risk based capital standards in the rule. Failure to maintain the buffer will result in restrictions on the Company’s ability to make capital distributions, including the payment of dividends, and to pay discretionary bonuses to executive officers. The capital buffer requirement is being phased-in over three years beginning in 2016. The March 31, 2018 table below includes the 1.875% increase as of January 1, 2018 in the minimum capital requirement ratios. The capital buffer requirement effectively raises the minimum required Common Equity Tier 1 Capital ratio to 7.0%, the Tier 1 Capital ratio to 8.5%, and the Total Capital ratio to 10.5% on a fully phased-in basis on January 1, 2019. As of March 31, 2018 and December 31, 2017, the Company was in compliance with the current phase of the Basel III Rule and management believes that the Company would meet all capital adequacy requirements under the Basel III Rule on a fully phased-in basis as if such requirements had been in effect (dollars in thousands) . Minimum Actual Capital Requirement with Minimum To Be Amount Ratio Amount Ratio Amount Ratio As of March 31, 2018: Total Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % Common Equity Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % Tier 1 Capital (to Average Assets) Consolidated $ % $ % N/A N/A Busey Bank $ % $ % $ % Minimum Actual Capital Requirement with Minimum To Be Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017: Total Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % South Side Bank $ % $ % $ % Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % South Side Bank $ % $ % $ % Common Equity Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % South Side Bank $ % $ % $ % Tier 1 Capital (to Average Assets) Consolidated $ % $ % N/A N/A Busey Bank $ % $ % $ % South Side Bank $ % $ % $ %

Operating Segments and Related

Operating Segments and Related Information	3 Months Ended
	Mar. 31, 2018
Operating Segments and Related Information
Operating Segments and Related Information	Note 16: Operating Segments and Related Information The Company has three reportable operating segments, Banking, Remittance Processing and Wealth Management. The Banking operating segment provides a full range of banking services to individual and corporate customers through its banking center network in Illinois, St. Louis, Missouri metropolitan area, southwest Florida and through its banking center in Indianapolis, Indiana. The Remittance Processing operating segment provides for online bill payments, lockbox and walk-in payments. The Wealth Management operating segment provides a full range of asset management, investment and fiduciary services to individuals, businesses and foundations, tax preparation, philanthropic advisory services and farm and brokerage services. The Company’s three operating segments are strategic business units that are separately managed as they offer different products and services and have different marketing strategies. The “other” category consists of the Parent Company and the elimination of intercompany transactions. The segment financial information provided below has been derived from information used by management to monitor and manage the financial performance of the Company. The accounting policies of the three segments are the same as those described in the summary of significant accounting policies in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. Following is a summary of selected financial information for the Company’s operating segments (dollars in thousands) : Goodwill Total Assets March 31, December 31, March 31, December 31, Banking $ $ $ $ Remittance Processing Wealth Management Other — — ) ) Totals $ $ $ $ Three Months Ended March 31, 2018 2017 Net interest income: Banking $ $ Remittance Processing Wealth Management Other ) ) Total net interest income $ $ Non-interest income: Banking $ $ Remittance Processing Wealth Management Other ) ) Total non-interest income $ $ Non-interest expense: Banking $ $ Remittance Processing Wealth Management Other Total non-interest expense $ $ Income before income taxes: Banking $ $ Remittance Processing Wealth Management Other ) ) Total income before income taxes $ $ Net income: Banking $ $ Remittance Processing Wealth Management Other ) ) Total net income $ $

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Financial Instruments
Derivative Financial Instruments	Note 17: Derivative Financial Instruments The Company originates and purchases derivative financial instruments, including interest rate lock commitments issued to residential loan customers for loans that will be held for sale, forward sales commitments to sell residential mortgage loans to loan investors, and interest rate swaps. See “ Note 18: Fair Value Measurements ” for further discussion of the fair value measurement of such derivatives. Interest Rate Lock Commitments. At March 31, 2018 and December 31, 2017, the Company had issued $72.1 million and $51.7 million, respectively, of unexpired interest rate lock commitments to loan customers. Such interest rate lock commitments that meet the definition of derivative financial instruments under ASC Topic 815, Derivatives and Hedging, are carried at their fair values in other assets or other liabilities in the unaudited Consolidated Financial Statements, with changes in the fair values of the corresponding derivative financial assets or liabilities recorded as either a charge or credit to current earnings during the period in which the changes occurred. Forward Sales Commitments. At March 31, 2018 and December 31, 2017, the Company had issued $90.9 million and $139.7 million, respectively, of unexpired forward sales commitments to mortgage loan investors. Typically, the Company economically hedges mortgage loans held for sale and interest rate lock commitments issued to its residential loan customers related to loans that will be held for sale by obtaining corresponding best-efforts forward sales commitments with an investor to sell the loans at an agreed-upon price at the time the interest rate locks are issued to the customers. Forward sales commitments that meet the definition of derivative financial instruments under ASC Topic 815, Derivatives and Hedging, are carried at their fair values in other assets or other liabilities in the unaudited Consolidated Financial Statements. While such forward sales commitments generally served as an economic hedge to the mortgage loans held for sale and interest rate lock commitments, the Company did not designate them for hedge accounting treatment. Consequently, changes in fair value of the corresponding derivative financial asset or liability were recorded as either a charge or credit to current earnings during the period in which the changes occurred. The fair values of derivative assets and liabilities related to interest rate lock commitments and forward sales commitments recorded in the unaudited Consolidated Balance Sheets are summarized as follows (dollars in thousands): March 31, 2018 December 31, 2017 Fair value recorded in other assets $ $ Fair value recorded in other liabilities The gross gains and losses on these derivative assets and liabilities recorded in non-interest income and expense in the unaudited Consolidated Statements of Income for the three months ended March 31, 2018 and 2017 are summarized as follows (dollars in thousands) : March 31, 2018 March 31, 2017 Gross gains $ $ Gross (losses) ) ) Net (losses) gains $ ) $ The impact of the net gains or losses on derivative financial instruments related to interest rate lock commitments issued to residential loan customers for loans that will be held for sale and forward sales commitments to sell residential mortgage loans to loan investors are almost entirely offset by a corresponding change in the fair value of loans held for sale. Interest Rate Swaps . Beginning in the second quarter of 2017, the Company entered into interest rate swap contracts to manage the interest rate risk exposure associated with specific commercial loan relationships, at the time such loans were originated. The Company offsets each customer derivative with a bank counterparty. With a notional values of $170.7 million and $161.3 million at March 31, 2018 and December 31, 2017, respectively, these contracts support variable rate, commercial loan relationships totaling $85.4 million and $80.7 million, respectively. While these swap derivatives generally worked together as an economic interest rate hedge, the Company did not designate them for hedge accounting treatment. Consequently, changes in fair value of the corresponding derivative financial asset or liability were recorded as either a charge or credit to current earnings during the period in which the changes occurred. The fair values of derivative assets and liabilities related to interest rate swaps recorded in the unaudited Consolidated Balance Sheets are summarized as follows (dollars in thousands): March 31, 2018 December 31, 2017 Fair value recorded in other assets $ $ Fair value recorded in other liabilities The gross gains and losses on derivative assets and liabilities related to interest rate swaps recorded in non-interest income and expense in the unaudited Consolidated Statements of Income for the three months ended March 31, 2018 are summarized as follows (dollars in thousands): March 31, 2018 Gross gains $ Gross losses ) Net gains (losses) $ — First Busey had $0.3 million in securities pledged to secure its obligation under these contracts at March 31, 2018. First Busey had $2.0 million in cash and $0.4 million in securities pledged to secure its obligation under contracts at December 31, 2017.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements
Fair Value Measurements	Note 18: Fair Value Measurements The fair value of an asset or liability is the price that would be received by selling that asset or paid in transferring that liability (exit price) in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. ASC Topic 820, Fair Value Measurement, establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1 Inputs - Unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 Inputs - Inputs other than quoted prices included in level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 Inputs - Unobservable inputs for determining the fair values of assets or liabilities that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. These valuation methodologies were applied to those Company assets and liabilities that are carried at fair value. There were no transfers between levels during the quarter ended March 31, 2018. In general, fair value is based upon quoted market prices, when available. If such quoted market prices are not available, fair values are measured utilizing independent valuation techniques of identical or similar securities for which significant assumptions are derived primarily from or corroborated by observable data. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect, among other things, counterparty credit quality and the company’s creditworthiness as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Securities Available for Sale . Securities classified as available for sale are reported at fair value utilizing level 2 measurements. The Company obtains fair value measurements from an independent pricing service. The independent pricing service utilizes evaluated pricing models that vary by asset class and incorporate available trade, bid and other market information. Because many fixed income securities do not trade on a daily basis, the independent pricing service applies available information, focusing on observable market data such as benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing, to prepare evaluations. The independent pricing service uses model processes, such as the Option Adjusted Spread model, to assess interest rate impact and develop prepayment scenarios. The models and processes take into account market conventions. For each asset class, a team of evaluators gathers information from market sources and integrates relevant credit information, perceived market movements and sector news into the evaluated pricing applications and models. The market inputs that the independent pricing service normally seeks for evaluations of securities, listed in approximate order of priority, include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including market research publications. The independent pricing service also monitors market indicators, industry and economic events. For certain security types, additional inputs may be used or some of the market inputs may not be applicable. Evaluators may prioritize inputs differently on any given day for any security based on market conditions, and not all inputs listed are available for use in the evaluation process for each security evaluation on a given day. Because the data utilized was observable, the securities have been classified as level 2 in ASC Topic 820. Securities Equity Investments . Securities classified as equity investments are reported at fair value utilizing level 1 measurements. For mutual funds and other equity securities, unadjusted quoted prices in active markets for identical assets are utilized to determine fair value at the measurement date and have been classified as level 1 in ASC Topic 820. Loans held for sale. Loans held for sale are reported at fair value utilizing level 2 measurements. The fair value of the mortgage loans held for sale are measured using observable quoted market or contract prices or market price equivalents and are classified as level 2 in ASC Topic 820. Derivative Assets and Derivative Liabilities. Derivative assets and derivative liabilities are reported at fair value utilizing level 2 measurements. The fair value of derivative assets and liabilities is determined based on prices that are obtained from a third-party which uses observable market inputs. Derivative assets and liabilities are classified as level 2 in ASC Topic 820. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Level 1 Level 2 Level 3 Total Inputs Inputs Inputs Fair Value March 31, 2018 Fair value adjusted through comprehensive income: Securities available for sale U.S. Treasury securities $ — $ $ — $ Obligations of U.S. government corporations and agencies — — Obligations of states and political subdivisions — — Residential mortgage-backed securities — — Corporate debt securities — — Fair value adjusted through current period earnings: Securities equity investments — — Loans held for sale — — Derivative assets — — Derivative liabilities — — Level 1 Level 2 Level 3 Total Inputs Inputs Inputs Fair Value December 31, 2017 Securities available for sale U.S. Treasury securities $ — $ $ — $ Obligations of U.S. government corporations and agencies — — Obligations of states and political subdivisions — — Residential mortgage-backed securities — — Corporate debt securities — — Securities equity investments — — Loans held for sale — — Derivative assets — — Derivative liabilities — — Certain financial assets and financial liabilities are measured at fair value on a non-recurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). Impaired Loans . The Company does not record loans at fair value on a recurring basis. However, periodically, a loan is considered impaired and is reported at the fair value of the underlying collateral, less estimated costs to sell, if repayment is expected solely from the collateral. Impaired loans measured at fair value typically consist of loans on non-accrual status and restructured loans in compliance with modified terms. Collateral values are estimated using a combination of observable inputs, including recent appraisals, and unobservable inputs based on customized discounting criteria. Due to the significance of the unobservable inputs, all impaired loan fair values have been classified as level 3 in ASC Topic 820. OREO. Non-financial assets and non-financial liabilities measured at fair value include OREO (upon initial recognition or subsequent impairment). OREO properties are measured using a combination of observable inputs, including recent appraisals, and unobservable inputs based on customized discounting criteria. Due to the significance of the unobservable inputs, all OREO fair values have been classified as level 3 in ASC Topic 820. The following table summarizes assets and liabilities measured at fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Level 1 Level 2 Level 3 Total Inputs Inputs Inputs Fair Value March 31, 2018 Impaired loans $ — $ — $ $ OREO(1) — — — — December 31, 2017 Impaired loans $ — $ — $ $ OREO(1) — — — — (1) OREO fair value was less than one thousand dollars. The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis for which the Company has utilized level 3 inputs to determine fair value (dollars in thousands) : Quantitative Information about Level 3 Fair Value Measurements Fair Value Valuation Unobservable Range Estimate Techniques Input (Weighted Average) March 31, 2018 Impaired loans $ Appraisal of collateral Appraisal adjustments -18.7% to -100.0% OREO(1) — Appraisal of collateral Appraisal adjustments -100.0% December 31, 2017 Impaired loans $ Appraisal of collateral Appraisal adjustments -20.3% to -100.0% OREO(1) — Appraisal of collateral Appraisal adjustments -100.0% (1) OREO fair value was less than one thousand dollars. The estimated fair values of financial instruments that are reported at amortized cost in the Company’s Consolidated Balance Sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (dollars in thousands) : March 31, 2018 December 31, 2017 Carrying Fair Carrying Fair Amount Value Amount Value Financial assets: Level 1 inputs: Cash and cash equivalents $ $ $ $ Level 2 inputs: Securities held to maturity Accrued interest receivable Level 3 inputs: Portfolio loans, net Mortgage servicing rights Other servicing rights Financial liabilities: Level 2 inputs: Time deposits(2) $ $ $ — $ — Deposits(2) — — Securities sold under agreements to repurchase Short-term borrowings — — Long-term debt Junior subordinated debt owed to unconsolidated trusts Accrued interest payable Level 3 inputs: Senior notes, net of unamortized issuance costs Subordinated notes, net of unamortized issuance costs (2) In connection with the adoption of ASU 2016-01 in 2018, only deposits with stated maturities are required to be disclosed. ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. A detailed description of the valuation methodologies used in estimating the fair value of financial instruments is set forth in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

Liability for Loans Sold

Liability for Loans Sold	3 Months Ended
	Mar. 31, 2018
Liability for Loans Sold
Liability for Loans Sold	Note 19: Liability for Loans Sold Under standard representations and warranties and early payment default clauses in the Company’s mortgage sale agreements, the Company could be required to repurchase mortgage loans sold to investors or reimburse the investors for losses incurred on loans in the event of borrower default within a defined period after origination (generally 90 days), or in the event of breaches of contractual representations or warranties made at the time of sale that are not remedied within a defined period after the Company receives notice of such breaches (generally 90 days). In addition, the Company may be required to refund the profit received from the sale of a loan to an investor if the borrower pays off the loan within a defined period after origination, which is generally 120 days. The Company records an estimated liability for probable amounts due to the Company’s loan investors under these obligations. This repurchase liability is determined based on a combination of factors including the volume of loans sold in current and previous periods; borrower default expectations; historical investor repurchase demand and appeals success rates; and estimated loss severity. Payments made to investors as reimbursement for losses incurred are charged against the mortgage repurchase liability. Loans repurchased from investors are initially recorded at fair value, which becomes the Company’s new accounting basis. The difference between the loan’s fair value and the payment made to investors as reimbursement for losses incurred is charged to the mortgage repurchase liability. Subsequent to repurchase, such loans are carried as portfolio loans on the Company’s Consolidated Balance Sheets. Loans repurchased with deteriorated credit quality at the date of repurchase are accounted for under ASC Topic 310-30. The liability for loans sold of $2.2 million and $2.1 million at March 31, 2018 and December 31, 2017, respectively, represents the Company’s best estimate of the probable losses that the Company will incur for various early default provisions and contractual representations and warranties associated with the sales of mortgage loans and is included in other liabilities in the accompanying Consolidated Balance Sheets. Because the level of mortgage loan repurchase losses depends upon economic factors, investor demand strategies and other external conditions that may change over the life of the underlying loans, the level of the liability for mortgage loan repurchase losses is difficult to estimate and requires considerable management judgment. In addition, the Company generally does not service the loans that it has sold to investors and is generally unable to track the remaining unpaid balances or delinquency status after sale. As a result, there may be a range of possible losses in excess of the estimated liability that cannot be estimated. Management maintains regular contact with the Company’s investors to monitor and address their repurchase demand practices and concerns.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2018
First Community
Schedule of fair value estimates of assets acquired and liabilities assumed	The following table presents the fair value estimates of First Community assets acquired and liabilities assumed as of July 2, 2017 (dollars in thousands) : As Recorded by Assets acquired: Cash and cash equivalents $ Securities Loans held for sale Portfolio loans Premises and equipment OREO Other intangible assets Other assets Total assets acquired Liabilities assumed: Deposits Other borrowings Other liabilities Total liabilities assumed Net assets acquired $ Consideration paid: Cash $ Cash payout of options and restricted stock units Common stock Fair value of stock options assumed Total consideration paid Goodwill $
Schedule of unaudited pro forma results of operations for the acquisition	Only the merger related expenses that have been recognized are included in net income in the table below (dollars in thousands, except per share amount) : Pro Forma Three Months Ended March 31, 2017 Total revenues (net interest income plus non-interest income) $ Net income Diluted earnings per common share
Mid Illinois Bancorp, Inc.
Schedule of fair value estimates of assets acquired and liabilities assumed	The following table presents the fair value estimates of Mid Illinois assets acquired and liabilities assumed as of October 1, 2017 (dollars in thousands): As Recorded by Assets acquired: Cash and cash equivalents $ Securities Loans held for sale Portfolio loans Premises and equipment Goodwill — Other intangible assets Other assets Total assets acquired Liabilities assumed: Deposits Other borrowings Other liabilities Total liabilities assumed Net assets acquired $ Consideration paid: Cash $ Common stock Total consideration paid Goodwill $

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Securities
Schedule of amortized cost, unrealized gains and losses and fair values of securities classified available for sale and held to maturity	The amortized cost, unrealized gains and losses and fair values of securities are summarized as follows (dollars in thousands) : Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value March 31, 2018: Available for sale U.S. Treasury securities $ $ $ ) $ Obligations of U.S. government corporations and agencies (1) — ) Obligations of states and political subdivisions ) Residential mortgage-backed securities ) Corporate debt securities ) Total $ $ $ ) $ Held to maturity Obligations of states and political subdivisions $ $ $ ) $ Commercial mortgage-backed securities ) Residential mortgage-backed securities — ) Total $ $ $ ) $ (1) The gross unrealized gains on obligations of U.S. government corporations and agencies was less than one thousand dollars. Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value December 31, 2017: Available for sale U.S. Treasury securities $ $ $ ) $ Obligations of U.S. government corporations and agencies ) Obligations of states and political subdivisions ) Residential mortgage-backed securities ) Corporate debt securities ) Total $ ) Held to maturity Obligations of states and political subdivisions $ $ $ ) $ Commercial mortgage-backed securities ) Residential mortgage-backed securities ) Total $ $ $ ) $
Schedule of amortized cost and fair value of debt securities available for sale and held to maturity by contractual maturity	The amortized cost and fair value of debt securities as of March 31, 2018, by contractual maturity or pre-refunded date, are shown below (dollars in thousands) . Available for sale Held to maturity Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ $ $ $ Due after one year through five years Due after five years through ten years Due after ten years Total $ $ $ $
Schedule of realized gains and losses related to sales of securities	Realized gains and losses related to sales of securities are summarized as follows ( dollars in thousands ): Three Months Ended March 31, 2018 2017 Gross security gains $ — $ Gross security (losses) — ) Security gains, net $ — $
Schedule of securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position	Information pertaining to securities with gross unrealized losses at March 31, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows ( dollars in thousands ): Continuous unrealized Continuous unrealized Total, gross Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses March 31, 2018: Available for sale U.S. Treasury securities $ $ ) $ — $ — $ $ ) Obligations of U.S. government corporations and agencies ) ) ) Obligations of states and political subdivisions ) ) ) Residential mortgage-backed securities ) ) ) Corporate debt securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) Held to maturity Obligations of states and political subdivisions(1) $ $ ) $ $ — $ $ ) Commercial mortgage-backed securities ) ) ) Residential mortgage-backed securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) (1) Continuous unrealized losses existing for greater than 12 months, gross was less than one thousand dollars. Continuous unrealized Continuous unrealized Total, gross Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses December 31, 2017: Available for sale U.S. Treasury securities $ $ ) $ — $ — $ $ ) Obligations of U.S. government corporations and agencies ) ) ) Obligations of states and political subdivisions ) ) ) Residential mortgage-backed securities ) ) ) Corporate debt securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ ) Held to maturity Obligations of states and political subdivisions $ $ ) $ — $ — $ $ ) Commercial mortgage-backed securities ) ) ) Residential mortgage-backed securities ) — — ) Total temporarily impaired securities $ $ ) $ $ ) $ $ )
General obligation bonds
Securities
Summary of amortized cost and fair values of the Company's portfolio of municipal bonds by issuers' state	The amortized cost and fair values of the Company’s portfolio of general obligation bonds are summarized in the following tables by the issuers’ state (dollars in thousands) : March 31, 2018: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Illinois $ $ $ Wisconsin Texas Michigan Ohio Pennsylvania New Jersey Missouri Other Total general obligations bonds $ $ $ December 31, 2017: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Illinois $ $ $ Wisconsin Texas Michigan Ohio Pennsylvania New Jersey Missouri Minnesota Other Total general obligations bonds $ $ $
Revenue bonds
Securities
Summary of amortized cost and fair values of the Company's portfolio of municipal bonds by issuers' state	The amortized cost and fair values of the Company’s portfolio of revenue bonds are summarized in the following tables by the issuers’ state (dollars in thousands) : March 31, 2018: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Indiana $ $ $ Missouri Illinois Other Total revenue bonds $ $ $ December 31, 2017: Average Exposure Number of Amortized Fair Per Issuer U.S. State Issuers Cost Value (Fair Value) Indiana $ $ $ Missouri Illinois Other Total revenue bonds $ $ $

Loans held for sale (Tables)

Loans held for sale (Tables)	3 Months Ended
	Mar. 31, 2018
Loans held for sale
Summary of mortgage revenue	The following is a summary of mortgage revenue (dollars in thousands) : Three Months Ended 2018 2017 Premiums received on sales of mortgage loans, including fair value adjustments $ $ Less direct origination costs ) ) Less provisions to liability for loans sold ) ) Mortgage servicing revenues Mortgage revenue $ $

Portfolio loans (Tables)

Portfolio loans (Tables)	3 Months Ended
	Mar. 31, 2018
Portfolio loans
Schedule of distributions of portfolio loans	Distributions of portfolio loans were as follows (dollars in thousands) : March 31, December 31, Commercial $ $ Commercial real estate Real estate construction Retail real estate Retail other Portfolio loans $ $ Less allowance for loan losses Portfolio loans, net $ $
Summary of risk grades segregated by category of portfolio loans (excluding accretable purchase accounting adjustments and non-posted clearings)	The following table is a summary of risk grades segregated by category of portfolio loans (excluding accretable purchase accounting adjustments and non-posted and clearings) (dollars in thousands ): March 31, 2018 Pass Watch Special Substandard Doubtful Commercial $ $ $ $ $ Commercial real estate Real estate construction Retail real estate Retail other — Total $ $ $ $ $ December 31, 2017 Pass Watch Special Substandard Doubtful Commercial $ $ $ $ $ Commercial real estate Real estate construction Retail real estate Retail other — Total $ $ $ $ $
Schedule of analysis of portfolio loans that are past due and still accruing or on a non-accrual status	An analysis of portfolio loans that are past due and still accruing or on a non-accrual status is as follows (dollars in thousands) : March 31, 2018 Loans past due, still accruing 30-59 Days 60-89 Days 90+Days Non-accrual Commercial $ $ $ — $ Commercial real estate Real estate construction — — — Retail real estate Retail other Total $ $ $ $ December 31, 2017 Loans past due, still accruing 30-59 Days 60-89 Days 90+Days Non-accrual Commercial $ $ $ $ Commercial real estate — Real estate construction — — — Retail real estate Retail other — Total $ $ $ $
Summary of restructured loans	A summary of restructured loans as of March 31, 2018 and December 31, 2017 is as follows (dollars in thousands) : March 31, December 31, In compliance with modified terms $ $ 30 – 89 days past due Included in non-performing loans Total $ $
Schedule of details of impaired loans, segregated by category	The average recorded investment is calculated using the most recent four quarters (dollars in thousands ). March 31, 2018 Unpaid Recorded Recorded Total Related Average Commercial $ $ $ $ $ $ Commercial real estate Real estate construction — — Retail real estate Retail other — — Total $ $ $ $ $ $ December 31, 2017 Unpaid Recorded Recorded Total Related Average Commercial $ $ $ $ $ $ Commercial real estate Real estate construction — — Retail real estate Retail other — — Total $ $ $ $ $ $
Schedule of activity on the allowance for loan losses	Allocation of a portion of the allowance to one category does not preclude its availability to absorb losses in other categories (dollars in thousands) : As of and for the Three Months Ended March 31, 2018 Commercial Commercial Real Estate Retail Real Retail Other Total Beginning balance $ $ $ $ $ $ Provision for loan loss ) Charged-off ) ) ) ) ) ) Recoveries Ending Balance $ $ $ $ $ $ As of and for the Three Months Ended March 31, 2017 Commercial Commercial Real Estate Retail Real Retail Other Total Beginning balance $ $ $ $ $ $ Provision for loan loss ) ) Charged-off ) ) — ) ) ) Recoveries Ending Balance $ $ $ $ $ $
Schedule of allowance for loan losses and recorded investments in portfolio loans, by category	The following table presents the allowance for loan losses and recorded investments in portfolio loans by category (dollars in thousands) : As of March 31, 2018 Commercial Commercial Real Estate Retail Real Retail Other Total Amount allocated to: Loans individually evaluated for impairment $ $ $ — $ $ — $ Loans collectively evaluated for impairment Ending Balance $ $ $ $ $ $ Loans: Loans individually evaluated for impairment $ $ $ $ $ $ Loans collectively evaluated for impairment PCI loans evaluated for impairment — Ending Balance $ $ $ $ $ $ As of December 31, 2017 Commercial Commercial Real Estate Retail Real Retail Other Total Amount allocated to: Loans individually evaluated for impairment $ $ $ — $ $ — $ Loans collectively evaluated for impairment Ending Balance $ $ $ $ $ $ Loans: Loans individually evaluated for impairment $ $ $ $ $ $ Loans collectively evaluated for impairment PCI loans evaluated for impairment — Ending Balance $ $ $ $ $ $

OREO (Tables)

OREO (Tables)	3 Months Ended
	Mar. 31, 2018
OREO
Summary of activity related to OREO	The following table summarizes activity related to OREO (dollars in thousands) : Three Months Ended Year Ended Beginning balance $ $ Additions, transfers from loans Additions, fair value from First Community acquisition — Additions, fair value from Mid Illinois acquisition — Proceeds from sales of OREO ) ) Gain on sales of OREO Valuation allowance for OREO — ) Ending balance $ $

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2018
Deposits
Schedule of composition of deposits	The composition of deposits is as follows (dollars in thousands) : March 31, 2018 December 31, 2017 Demand deposits, noninterest-bearing $ $ Interest-bearing transaction deposit Saving deposits and money market deposits Time deposits Total $ $
Schedule of maturities of time deposits	As of March 31, 2018, the scheduled maturities of time deposits, are as follows (dollars in thousands) : April 1, 2018 – March 31, 2019 $ April 1, 2019 – March 31, 2020 April 1, 2020 – March 31, 2021 April 1, 2021 – March 31, 2022 April 1, 2022 – March 31, 2023 Thereafter $

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2018
Borrowings
Schedule of distribution of securities sold under agreements to repurchase and short-term borrowings and weighted average interest rates	The following table sets forth the distribution of securities sold under agreements to repurchase and short-term borrowings and weighted average interest rates (dollars in thousands) : March 31, December 31, Securities sold under agreements to repurchase Balance at end of period $ $ Weighted average interest rate at end of period % % Maximum outstanding at any month end in year-to-date period $ $ Average daily balance for the year-to-date period $ $ Weighted average interest rate during period(1) % % Short-term borrowings, FHLB advances Balance at end of period $ — $ Weighted average interest rate at end of period — % % Maximum outstanding at any month end in year-to-date period $ $ Average daily balance for the year-to-date period $ $ Weighted average interest rate during period(1) % % (1) The weighted average interest rate is computed by dividing total annualized interest for the year-to-date period by the average daily balance outstanding.
Summary of long-term debt	Long-term debt is summarized as follows (dollars in thousands) : March 31, December 31, Notes payable, FHLB, ranging in original maturity from nineteen months to ten years, collateralized by FHLB deposits, residential and commercial real estate loans and FHLB stock. $ $

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Common Share
Schedule of computation of earnings per common share	Earnings per common share have been computed as follows (in thousands, except per share data) : Three Months Ended 2018 2017 Net income $ $ Shares: Weighted average common shares outstanding Dilutive effect of outstanding options, warrants and restricted stock units as determined by the application of the treasury stock method Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation Basic earnings per common share $ $ Diluted earnings per common share $ $

Share-based Compensation (Table

Share-based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Share-based Compensation
Schedule of status of and changes in the Company's stock option awards	A summary of the status of and changes in the Company’s stock option awards for the three months ended March 31, 2018 follows: Weighted- Weighted- Average Average Exercise Remaining Contractual Shares Price Term Outstanding at beginning of year $ Exercised ) Forfeited ) Expired ) Outstanding at end of period $ Exercisable at end of period $
Summary of the changes in the Company's stock unit awards	A summary of the changes in the Company’s stock unit awards for the three months ended March 31, 2018, is as follows: Weighted- Director Weighted- Restricted Average Deferred Average Stock Grant Date Stock Grant Date Units Fair Value Units Fair Value Non-vested at beginning of year $ $ Granted — — — — Dividend equivalents earned Vested — — ) Forfeited ) — — Non-vested at end of period $ $ Outstanding at end of period $ $

Outstanding Commitments and C37

Outstanding Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Outstanding Commitments and Contingent Liabilities
Schedule of contractual amount of exposure to off-balance-sheet risk	A summary of the contractual amount of the Company’s exposure to off-balance-sheet risk relating to the Company’s commitments to extend credit and standby letters of credit follows ( dollars in thousands ): March 31, 2018 December 31, 2017 Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ $ Standby letters of credit

Capital (Tables)

Capital (Tables)	3 Months Ended
	Mar. 31, 2018
Capital
Schedule of capital adequacy requirements	As of March 31, 2018 and December 31, 2017, the Company was in compliance with the current phase of the Basel III Rule and management believes that the Company would meet all capital adequacy requirements under the Basel III Rule on a fully phased-in basis as if such requirements had been in effect (dollars in thousands) . Minimum Actual Capital Requirement with Minimum To Be Amount Ratio Amount Ratio Amount Ratio As of March 31, 2018: Total Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % Common Equity Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % Tier 1 Capital (to Average Assets) Consolidated $ % $ % N/A N/A Busey Bank $ % $ % $ % Minimum Actual Capital Requirement with Minimum To Be Amount Ratio Amount Ratio Amount Ratio As of December 31, 2017: Total Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % South Side Bank $ % $ % $ % Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % South Side Bank $ % $ % $ % Common Equity Tier 1 Capital (to Risk Weighted Assets) Consolidated $ % $ % $ % Busey Bank $ % $ % $ % South Side Bank $ % $ % $ % Tier 1 Capital (to Average Assets) Consolidated $ % $ % N/A N/A Busey Bank $ % $ % $ % South Side Bank $ % $ % $ %

Operating Segments and Relate39

Operating Segments and Related Information (Tables)	3 Months Ended
	Mar. 31, 2018
Operating Segments and Related Information
Summary of information relating to operating segments	Following is a summary of selected financial information for the Company’s operating segments (dollars in thousands) : Goodwill Total Assets March 31, December 31, March 31, December 31, Banking $ $ $ $ Remittance Processing Wealth Management Other — — ) ) Totals $ $ $ $ Three Months Ended March 31, 2018 2017 Net interest income: Banking $ $ Remittance Processing Wealth Management Other ) ) Total net interest income $ $ Non-interest income: Banking $ $ Remittance Processing Wealth Management Other ) ) Total non-interest income $ $ Non-interest expense: Banking $ $ Remittance Processing Wealth Management Other Total non-interest expense $ $ Income before income taxes: Banking $ $ Remittance Processing Wealth Management Other ) ) Total income before income taxes $ $ Net income: Banking $ $ Remittance Processing Wealth Management Other ) ) Total net income $ $

Derivative Financial Instrume40

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Interest rate lock commitments and forward sales commitments
Summary of fair values of derivative assets and liabilities recorded in consolidated balance sheet	The fair values of derivative assets and liabilities related to interest rate lock commitments and forward sales commitments recorded in the unaudited Consolidated Balance Sheets are summarized as follows (dollars in thousands): March 31, 2018 December 31, 2017 Fair value recorded in other assets $ $ Fair value recorded in other liabilities
Summary of gross gains and losses on derivative assets and liabilities recorded in non-interest income and expense in consolidated statements of income	The gross gains and losses on these derivative assets and liabilities recorded in non-interest income and expense in the unaudited Consolidated Statements of Income for the three months ended March 31, 2018 and 2017 are summarized as follows (dollars in thousands) : March 31, 2018 March 31, 2017 Gross gains $ $ Gross (losses) ) ) Net (losses) gains $ ) $
Interest rate swap
Summary of fair values of derivative assets and liabilities recorded in consolidated balance sheet	The fair values of derivative assets and liabilities related to interest rate swaps recorded in the unaudited Consolidated Balance Sheets are summarized as follows (dollars in thousands): March 31, 2018 December 31, 2017 Fair value recorded in other assets $ $ Fair value recorded in other liabilities
Summary of gross gains and losses on derivative assets and liabilities recorded in non-interest income and expense in consolidated statements of income	The gross gains and losses on derivative assets and liabilities related to interest rate swaps recorded in non-interest income and expense in the unaudited Consolidated Statements of Income for the three months ended March 31, 2018 are summarized as follows (dollars in thousands): March 31, 2018 Gross gains $ Gross losses ) Net gains (losses) $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Measurements
Schedule of financial assets and financial liabilities measured at fair value on a recurring basis	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Level 1 Level 2 Level 3 Total Inputs Inputs Inputs Fair Value March 31, 2018 Fair value adjusted through comprehensive income: Securities available for sale U.S. Treasury securities $ — $ $ — $ Obligations of U.S. government corporations and agencies — — Obligations of states and political subdivisions — — Residential mortgage-backed securities — — Corporate debt securities — — Fair value adjusted through current period earnings: Securities equity investments — — Loans held for sale — — Derivative assets — — Derivative liabilities — — Level 1 Level 2 Level 3 Total Inputs Inputs Inputs Fair Value December 31, 2017 Securities available for sale U.S. Treasury securities $ — $ $ — $ Obligations of U.S. government corporations and agencies — — Obligations of states and political subdivisions — — Residential mortgage-backed securities — — Corporate debt securities — — Securities equity investments — — Loans held for sale — — Derivative assets — — Derivative liabilities — —
Schedule of assets and liabilities measured at fair value on a non-recurring basis	The following table summarizes assets and liabilities measured at fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Level 1 Level 2 Level 3 Total Inputs Inputs Inputs Fair Value March 31, 2018 Impaired loans $ — $ — $ $ OREO(1) — — — — December 31, 2017 Impaired loans $ — $ — $ $ OREO(1) — — — — (1) OREO fair value was less than one thousand dollars.
Schedule of quantitative information about Level 3 fair value measurements	The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis for which the Company has utilized level 3 inputs to determine fair value (dollars in thousands) : Quantitative Information about Level 3 Fair Value Measurements Fair Value Valuation Unobservable Range Estimate Techniques Input (Weighted Average) March 31, 2018 Impaired loans $ Appraisal of collateral Appraisal adjustments -18.7% to -100.0% OREO(1) — Appraisal of collateral Appraisal adjustments -100.0% December 31, 2017 Impaired loans $ Appraisal of collateral Appraisal adjustments -20.3% to -100.0% OREO(1) — Appraisal of collateral Appraisal adjustments -100.0% (1) OREO fair value was less than one thousand dollars.
Schedule of estimated fair values of financial instruments	The estimated fair values of financial instruments that are reported at amortized cost in the Company’s Consolidated Balance Sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, were as follows (dollars in thousands) : March 31, 2018 December 31, 2017 Carrying Fair Carrying Fair Amount Value Amount Value Financial assets: Level 1 inputs: Cash and cash equivalents $ $ $ $ Level 2 inputs: Securities held to maturity Accrued interest receivable Level 3 inputs: Portfolio loans, net Mortgage servicing rights Other servicing rights Financial liabilities: Level 2 inputs: Time deposits(2) $ $ $ — $ — Deposits(2) — — Securities sold under agreements to repurchase Short-term borrowings — — Long-term debt Junior subordinated debt owed to unconsolidated trusts Accrued interest payable Level 3 inputs: Senior notes, net of unamortized issuance costs Subordinated notes, net of unamortized issuance costs (2) In connection with the adoption of ASU 2016-01 in 2018, only deposits with stated maturities are required to be disclosed.

Acquisitions - First Community

Acquisitions - First Community Financial Partners, Inc. (Details) $ / shares in Units, $ in Thousands, shares in Millions	Jul. 02, 2017USD ($)item$ / shares	Jun. 30, 2017USD ($)$ / sharesshares	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)$ / shares	Dec. 31, 2017USD ($)
Consideration paid:
Goodwill			$ 267,685		$ 269,346
First Community
Business Acquisition
Number of banking centers | item	9
Share consideration conversion ratio	0.396
Per share cash consideration entitled (in dollars per share) | $ / shares	$ 1.35
Number of common shares issued for acquisition | shares		7.2
Market value of common stock issued		$ 211,100
Share price | $ / shares		$ 29.32
Options to purchase common stock, conversion ratio	0.44
Assets acquired:
Cash and cash equivalents	$ 60,686
Securities	165,843
Loans held for sale	905
Portfolio loans	1,096,583
Premises and equipment	18,094
OREO	722
Other intangible assets	13,979
Other assets	41,755
Total assets acquired	1,398,567
Liabilities assumed:
Deposits	1,134,355
Other borrowings	125,751
Other liabilities	11,862
Total liabilities assumed	1,271,968
Net assets acquired	126,599
Consideration paid:
Cash	24,557
Cash payout of options and restricted stock units	6,182
Common stock	211,120
Fair value of stock options assumed	722
Total consideration paid	242,581
Goodwill	115,982
Fair value of performing loans, including loans held for sale	1,100,000
Amount expected to be accreted, gross	14,400
Contractual amount of PCI loans	17,900
Fair value of credit-impaired loans	12,500
PCI loan outstanding amount			5,100
Accretable yield expected to be recognized over the estimated period	$ 600
Amount accelerated as a result of collections					$ 200
Total revenues (net interest income plus non-interest income)				$ 74,885
Net income				$ 19,111
Diluted earnings per common share (in dollars per share) | $ / shares				$ 0.42
First Community | Non-interest expense
Business Acquisition
Business acquisition expenses			$ 100	$ 600

Acquisitions - Mid Illinois Ban

Acquisitions - Mid Illinois Bancorp, Inc. (Details) - USD ($) $ / shares in Units, $ in Thousands	Oct. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets acquired:
Goodwill		$ 267,685		$ 269,346
Consideration paid:
Goodwill		267,685		$ 269,346
Mid Illinois Bancorp, Inc.
Business Acquisition
Per share cash consideration entitled (in dollars per share)	$ 227.94
Number of common shares issued for acquisition	7.5149
Assets acquired:
Cash and cash equivalents	$ 39,443
Securities	208,003
Loans held for sale	5,031
Portfolio loans	356,651
Premises and equipment	16,551
Goodwill	48,889
Other intangible assets	11,531
Other assets	29,564
Total assets acquired	666,774
Liabilities assumed:
Deposits	505,917
Other borrowings	61,040
Other liabilities	10,497
Total liabilities assumed	577,454
Net assets acquired	89,320
Consideration paid:
Cash	40,507
Common stock	97,702
Total consideration paid	138,209
Goodwill	48,889
Aggregate principal outstanding	362,400
Fair value of performing loans, including loans held for sale	357,000
Amount expected to be accreted, gross	$ 5,400
Estimated remaining life for loans expected to be accreted (in years)	4 years
Contractual amount of PCI loans	$ 7,600
Fair value of credit-impaired loans	4,700
PCI loan outstanding amount		900
Accretable yield expected to be recognized over the estimated period	$ 100
Mixed consideration in cash (in dollars per share)	$ 68.38
Mixed consideration in shares (in dollars per share)	5.2604
Total consideration in stock (as a percent)	70.00%
Total consideration in cash (as a percent)	30.00%
Mid Illinois Bancorp, Inc. | Non-interest expense
Business Acquisition
Business acquisition expenses		$ 3,000	$ 100

Recent Accounting Pronounceme44

Recent Accounting Pronouncements (Details) - Adjustments $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Accounting Standards Update 2016-01
Basis of Presentation
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0
Accounting Standards Update 2018-02
Basis of Presentation
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect	$ 0

Securities - General Disclosure

Securities - General Disclosures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)item	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Securities
Equity securities consisting of common stock and money market mutual funds with fair value	$ 5,028		$ 5,378
Money market mutual fund balances	4,300		4,600
Proceeds from sale of equity securities	0
Available for sale
Amortized Cost	835,632		877,459
Gross Unrealized Gains	844		1,912
Gross Unrealized Losses	(14,375)		(6,689)
Fair Value	822,101		872,682
Held to maturity
Amortized Cost	459,007		443,550
Gross Unrealized Gains	64		294
Gross Unrealized Losses	(8,942)		(2,792)
Fair Value	450,129		441,052
Available for sale, Amortized Cost
Due in one year or less	68,846
Due after one year through five years	259,944
Due after five years through ten years	163,189
Due after ten years	343,653
Amortized Cost	835,632		877,459
Available for sale, Fair Value
Due in one year or less	68,697
Due after one year through five years	256,126
Due after five years through ten years	161,232
Due after ten years	336,046
Fair Value	822,101		872,682
Held to maturity, Amortized Cost
Due in one year or less	7,744
Due after one year through five years	59,000
Due after five years through ten years	32,451
Due after ten years	359,812
Amortized Cost	459,007		443,550
Held to maturity, Fair Value
Due in one year or less	7,713
Due after one year through five years	58,207
Due after five years through ten years	31,965
Due after ten years	352,244
Fair Value	450,129		441,052
Realized gains and losses related to sales of securities
Gross security gains		$ 968
Gross security (losses)		(111)
Security gains, net		857
Tax provision related to net realized gains (losses)		$ 300
Available for sale, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	628,368		540,033
Continuous unrealized losses existing for greater than 12 months, gross	127,846		127,806
Total	756,214		667,839
Available for sale, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(9,670)		(3,623)
Continuous unrealized losses existing for greater than 12 months, gross	(4,705)		(3,066)
Total	(14,375)		(6,689)
Held to maturity, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	435,160		340,279
Continuous unrealized losses existing for greater than 12 months, gross	2,467		2,374
Total	437,627		342,653
Held to maturity, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(8,815)		(2,709)
Continuous unrealized losses existing for greater than 12 months, gross	(127)		(83)
Total	$ (8,942)		(2,792)
Number of securities in unrealized loss position | item	841
Securities in unrealized loss position as a percentage of aggregate carrying value of investments	1.92%
Collateral
Realized gains and losses related to sales of securities
Carrying amount of investment securities pledged as collateral	$ 581,200		638,200
U.S. Treasury securities
Available for sale
Amortized Cost	61,005		60,829
Gross Unrealized Gains	2		7
Gross Unrealized Losses	(943)		(488)
Fair Value	60,064		60,348
Available for sale, Amortized Cost
Amortized Cost	61,005		60,829
Available for sale, Fair Value
Fair Value	60,064		60,348
Available for sale, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	59,843		59,773
Total	59,843		59,773
Available for sale, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(943)		(488)
Total	(943)		(488)
Obligations of U.S. government corporations and agencies
Available for sale
Amortized Cost	97,967		104,807
Gross Unrealized Gains			1
Gross Unrealized Losses	(1,774)		(1,143)
Fair Value	96,193		103,665
Available for sale, Amortized Cost
Amortized Cost	97,967		104,807
Available for sale, Fair Value
Fair Value	96,193		103,665
Available for sale, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	71,479		78,610
Continuous unrealized losses existing for greater than 12 months, gross	24,640		24,831
Total	96,119		103,441
Available for sale, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(1,111)		(636)
Continuous unrealized losses existing for greater than 12 months, gross	(663)		(507)
Total	(1,774)		(1,143)
Obligations of U.S. government corporations and agencies | Maximum
Available for sale
Gross Unrealized Gains	1
Obligations of states and political subdivisions
Available for sale
Amortized Cost	263,619		280,216
Gross Unrealized Gains	447		1,160
Gross Unrealized Losses	(3,076)		(1,177)
Fair Value	260,990		280,199
Held to maturity
Amortized Cost	40,464		41,300
Gross Unrealized Gains	57		228
Gross Unrealized Losses	(150)		(64)
Fair Value	40,371		41,464
Available for sale, Amortized Cost
Amortized Cost	263,619		280,216
Available for sale, Fair Value
Fair Value	260,990		280,199
Held to maturity, Amortized Cost
Amortized Cost	40,464		41,300
Held to maturity, Fair Value
Fair Value	40,371		41,464
Available for sale, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	208,656		162,213
Continuous unrealized losses existing for greater than 12 months, gross	16,360		12,045
Total	225,016		174,258
Available for sale, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(2,851)		(1,027)
Continuous unrealized losses existing for greater than 12 months, gross	(225)		(150)
Total	(3,076)		(1,177)
Held to maturity, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	28,682		17,939
Continuous unrealized losses existing for greater than 12 months, gross	150
Total	28,832		17,939
Held to maturity, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(150)		(64)
Total	(150)		(64)
Obligations of states and political subdivisions | Maximum
Held to maturity, Unrealized Losses
Continuous unrealized losses existing for greater than 12 months, gross	(1)
Residential mortgage-backed securities
Available for sale
Amortized Cost	380,783		400,661
Gross Unrealized Gains	361		612
Gross Unrealized Losses	(8,246)		(3,837)
Fair Value	372,898		397,436
Held to maturity
Amortized Cost	358,165		341,776
Gross Unrealized Gains			25
Gross Unrealized Losses	(7,563)		(2,431)
Fair Value	350,602		339,370
Available for sale, Amortized Cost
Amortized Cost	380,783		400,661
Available for sale, Fair Value
Fair Value	372,898		397,436
Held to maturity, Amortized Cost
Amortized Cost	358,165		341,776
Held to maturity, Fair Value
Fair Value	350,602		339,370
Available for sale, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	260,034		223,261
Continuous unrealized losses existing for greater than 12 months, gross	86,846		90,930
Total	346,880		314,191
Available for sale, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(4,429)		(1,428)
Continuous unrealized losses existing for greater than 12 months, gross	(3,817)		(2,409)
Total	(8,246)		(3,837)
Held to maturity, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	350,602		277,826
Total	350,602		277,826
Held to maturity, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(7,563)		(2,431)
Total	(7,563)		(2,431)
Corporate debt securities
Available for sale
Amortized Cost	32,258		30,946
Gross Unrealized Gains	34		132
Gross Unrealized Losses	(336)		(44)
Fair Value	31,956		31,034
Available for sale, Amortized Cost
Amortized Cost	32,258		30,946
Available for sale, Fair Value
Fair Value	31,956		31,034
Available for sale, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	28,356		16,176
Total	28,356		16,176
Available for sale, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(336)		(44)
Total	(336)		(44)
Commercial mortgage-backed securities
Held to maturity
Amortized Cost	60,378		60,474
Gross Unrealized Gains	7		41
Gross Unrealized Losses	(1,229)		(297)
Fair Value	59,156		60,218
Held to maturity, Amortized Cost
Amortized Cost	60,378		60,474
Held to maturity, Fair Value
Fair Value	59,156		60,218
Held to maturity, Fair Value
Continuous unrealized losses existing for less than 12 months, gross	55,876		44,514
Continuous unrealized losses existing for greater than 12 months, gross	2,317		2,374
Total	58,193		46,888
Held to maturity, Unrealized Losses
Continuous unrealized losses existing for less than 12 months, gross	(1,102)		(214)
Continuous unrealized losses existing for greater than 12 months, gross	(127)		(83)
Total	(1,229)		$ (297)
Non-interest income | Common Stock
Securities
Unrealized losses recorded	$ (100)

Securities - Obligations by Sta

Securities - Obligations by State (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)item	Dec. 31, 2017USD ($)item
Securities
Available for sale, fair value	$ 822,101	$ 872,682
Held to maturity, fair value	$ 450,129	$ 441,052
General obligation bonds
Securities
Number of issuers | item	365	381
Amortized Cost	$ 254,834	$ 271,499
Fair Value	252,576	271,659
Average Exposure Per Issuer (Fair Value)	692	713
Amount of largest exposure to a single issuer	$ 4,000	$ 4,000
Percentage of the entity's stockholders equity in excess of aggregate book or market value	10.00%	10.00%
Percentage of bonds rated by nationally recognized statistical rating organization	99.30%	99.30%
Percentage of bonds unrated	0.70%	0.70%
Minimum number of nationally recognized statistical rating organizations | item	1	1
General obligation bonds | Illinois
Securities
Number of issuers | item	91	97
Amortized Cost	$ 89,465	$ 95,340
Fair Value	88,644	95,344
Average Exposure Per Issuer (Fair Value)	$ 974	$ 983
General obligation bonds | Wisconsin
Securities
Number of issuers | item	36	41
Amortized Cost	$ 23,792	$ 27,852
Fair Value	23,583	27,809
Average Exposure Per Issuer (Fair Value)	$ 655	$ 678
General obligation bonds | Texas
Securities
Number of issuers | item	46	46
Amortized Cost	$ 25,760	$ 27,485
Fair Value	25,421	27,514
Average Exposure Per Issuer (Fair Value)	$ 553	$ 598
General obligation bonds | Michigan
Securities
Number of issuers | item	34	34
Amortized Cost	$ 19,601	$ 19,641
Fair Value	19,687	19,849
Average Exposure Per Issuer (Fair Value)	$ 579	$ 584
General obligation bonds | Ohio
Securities
Number of issuers | item	20	20
Amortized Cost	$ 15,120	$ 15,172
Fair Value	14,962	15,162
Average Exposure Per Issuer (Fair Value)	$ 748	$ 758
General obligation bonds | Pennsylvania
Securities
Number of issuers | item	18	18
Amortized Cost	$ 11,011	$ 12,189
Fair Value	10,984	12,174
Average Exposure Per Issuer (Fair Value)	$ 610	$ 676
General obligation bonds | New Jersey
Securities
Number of issuers | item	14	15
Amortized Cost	$ 6,340	$ 7,755
Fair Value	6,298	7,760
Average Exposure Per Issuer (Fair Value)	$ 450	$ 517
General obligation bonds | Missouri
Securities
Number of issuers | item	10	10
Amortized Cost	$ 5,733	$ 5,759
Fair Value	5,691	5,747
Average Exposure Per Issuer (Fair Value)	$ 569	$ 575
General obligation bonds | Minnesota
Securities
Number of issuers | item		8
Amortized Cost		$ 5,657
Fair Value		5,667
Average Exposure Per Issuer (Fair Value)		$ 708
General obligation bonds | Other
Securities
Number of issuers | item	96	92
Amortized Cost	$ 58,012	$ 54,649
Fair Value	57,306	54,633
Average Exposure Per Issuer (Fair Value)	$ 597	$ 594
Revenue bonds
Securities
Number of issuers | item	65	65
Amortized Cost	$ 49,249	$ 50,017
Fair Value	48,785	50,004
Average Exposure Per Issuer (Fair Value)	751	769
Amount of largest exposure to a single issuer	$ 3,500	$ 3,600
Percentage of the entity's stockholders equity in excess of aggregate book or market value	10.00%	10.00%
Percentage of bonds rated by nationally recognized statistical rating organization	99.40%	99.40%
Percentage of bonds unrated	0.60%	0.60%
Minimum number of nationally recognized statistical rating organizations | item	1	1
Revenue bonds | Indiana
Securities
Number of issuers | item	14	14
Amortized Cost	$ 11,977	$ 12,001
Fair Value	11,911	12,054
Average Exposure Per Issuer (Fair Value)	$ 851	$ 861
Revenue bonds | Illinois
Securities
Number of issuers | item	7	7
Amortized Cost	$ 6,217	$ 6,477
Fair Value	6,144	6,456
Average Exposure Per Issuer (Fair Value)	$ 878	$ 922
Revenue bonds | Missouri
Securities
Number of issuers | item	6	6
Amortized Cost	$ 7,369	$ 7,376
Fair Value	7,301	7,336
Average Exposure Per Issuer (Fair Value)	$ 1,217	$ 1,223
Revenue bonds | Other
Securities
Number of issuers | item	38	38
Amortized Cost	$ 23,686	$ 24,163
Fair Value	23,429	24,158
Average Exposure Per Issuer (Fair Value)	617	636
Obligations of states and political subdivisions
Securities
Available for sale, fair value	260,990	280,199
Held to maturity, fair value	$ 40,371	$ 41,464
Number of issuers | item	430	446
Total capital for rated securities (as a percent)	100.00%
Total capital for unrated securities (as a percent)	15.00%
Obligations of states and political subdivisions | General obligation bonds
Securities
Fair Value	$ 252,600	$ 271,700
Number of states in which investment is held | item	36	36
Number of states in which investment is held in excess of aggregate fair value | item	8	9
Aggregate fair value	$ 5,000	$ 5,000
Obligations of states and political subdivisions | Revenue bonds
Securities
Fair Value	$ 48,800	$ 50,000
Number of states in which investment is held | item	22	22
Number of states in which investment is held in excess of aggregate fair value | item	3	3
Aggregate fair value	$ 5,000	$ 5,000

Loans held for sale (Details)

Loans held for sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loans held for sale
Loans held for sale	$ 29,034		$ 94,848
Premiums received on sales of mortgage loans, including fair value adjustments	4,107	$ 12,151
Less direct origination costs	(3,019)	(10,387)
Less provisions to liability for loans sold	(62)	(25)
Mortgage servicing revenues	617	395
Mortgage revenue	$ 1,643	$ 2,134

Portfolio loans - Distributions

Portfolio loans - Distributions of Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)itemmi	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Loans
Portfolio loans	$ 5,531,453	$ 5,519,500
Less allowance for loan losses	52,649	53,582	$ 48,442	$ 47,795
Portfolio loans, net	5,478,804	5,465,918
Net deferred loan origination costs	4,500	4,100
Amount of loan reduction due to net accretable purchase accounting adjustments	$ 20,700	23,600
Minimum target period for lending via intermediate term loans	0 years
Maximum target period for lending via intermediate term loans	7 years
Geographical area from lending offices which attempt is made to lend short and intermediate term loans (in miles) | mi	125
Number of primary areas for lending loan | item	5
Commercial
Loans
Portfolio loans	$ 1,431,496	1,414,631
Less allowance for loan losses	17,577	14,779	13,260	13,303
Commercial real estate
Loans
Portfolio loans	2,360,560	2,354,684
Less allowance for loan losses	22,090	21,813	19,848	20,623
Real estate construction
Loans
Portfolio loans	269,125	261,506
Less allowance for loan losses	2,799	2,861	2,021	1,870
Retail real estate
Loans
Portfolio loans	1,443,962	1,460,801
Less allowance for loan losses	9,836	13,783	12,978	11,648
Retail other
Loans
Portfolio loans	26,310	27,878
Less allowance for loan losses	$ 347	$ 346	$ 335	$ 351

Portfolio loans - Risk Grading

Portfolio loans - Risk Grading (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Pass and watch
Loans
Portfolio loans receivable	$ 5,300,000	$ 5,300,000
Special mention, substandard and doubtful
Loans
Portfolio loans receivable	223,000	193,800
Pass
Loans
Portfolio loans receivable	5,018,865	5,022,249
Watch
Loans
Portfolio loans receivable	303,800	320,016
Special Mention
Loans
Limit above which loans are annually reviewed	350
Portfolio loans receivable	87,667	81,559
Substandard
Loans
Portfolio loans receivable	102,737	87,628
Doubtful
Loans
Portfolio loans receivable	32,588	24,624
Commercial | Pass and watch
Loans
Limit where loans are processed through an expedited underwriting process	350
Commercial | Pass and watch | Minimum
Loans
Limit where loans are processed through an expedited underwriting process	350
Commercial | Pass and watch | Maximum
Loans
Limit where loans are processed through an expedited underwriting process	1,000
Commercial | Pass
Loans
Portfolio loans receivable	1,195,019	1,175,421
Commercial | Watch
Loans
Limit above which loans are annually reviewed	1,000
Portfolio loans receivable	127,638	141,776
Commercial | Special Mention
Loans
Portfolio loans receivable	48,919	51,366
Commercial | Substandard
Loans
Portfolio loans receivable	52,359	43,933
Commercial | Doubtful
Loans
Portfolio loans receivable	9,927	5,285
Commercial real estate
Loans
Limit where loans are processed through an expedited underwriting process	1,000
Commercial real estate | Pass
Loans
Portfolio loans receivable	2,164,692	2,169,420
Commercial real estate | Watch
Loans
Portfolio loans receivable	125,008	130,056
Commercial real estate | Special Mention
Loans
Portfolio loans receivable	26,745	21,151
Commercial real estate | Substandard
Loans
Portfolio loans receivable	43,116	36,482
Commercial real estate | Doubtful
Loans
Portfolio loans receivable	13,269	11,997
Real estate construction | Pass
Loans
Portfolio loans receivable	220,493	212,952
Real estate construction | Watch
Loans
Portfolio loans receivable	42,085	41,292
Real estate construction | Special Mention
Loans
Portfolio loans receivable	4,016	3,880
Real estate construction | Substandard
Loans
Portfolio loans receivable	2,463	3,071
Real estate construction | Doubtful
Loans
Portfolio loans receivable	868	608
Retail real estate | Pass
Loans
Portfolio loans receivable	1,411,995	1,436,156
Retail real estate | Watch
Loans
Portfolio loans receivable	9,069	6,883
Retail real estate | Special Mention
Loans
Portfolio loans receivable	7,980	5,162
Retail real estate | Substandard
Loans
Portfolio loans receivable	4,792	4,135
Retail real estate | Doubtful
Loans
Portfolio loans receivable	8,506	6,714
Retail other | Pass
Loans
Portfolio loans receivable	26,666	28,300
Retail other | Watch
Loans
Portfolio loans receivable		9
Retail other | Special Mention
Loans
Portfolio loans receivable	7
Retail other | Substandard
Loans
Portfolio loans receivable	7	7
Retail other | Doubtful
Loans
Portfolio loans receivable	$ 18	$ 20

Portfolio loans - Past due loan

Portfolio loans - Past due loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)item	Dec. 31, 2017USD ($)
Loans past due, still accruing
Loans past due, still accruing	$ 995	$ 2,741
Non-accrual Loans	32,588	24,624
Gross interest income that would have been recorded if impaired loans had been current	$ 400
Number of primary loan lending activities | item	5
Restructured loan included in non-performing loans	90 days
Restructured loans:
Total loans	$ 11,350	11,900
30 to 59 Days
Loans past due, still accruing
Loans past due, still accruing	6,601	8,477
60 to 89 Days
Loans past due, still accruing
Loans past due, still accruing	2,905	4,420
In compliance with modified terms
Restructured loans:
Total loans	9,297	9,873
30-89 days past due
Restructured loans:
Total loans	78	108
Included in non-performing loans
Restructured loans:
Total loans	1,975	1,919
Commercial
Loans past due, still accruing
Loans past due, still accruing		1,808
Non-accrual Loans	9,927	5,285
Commercial | 30 to 59 Days
Loans past due, still accruing
Loans past due, still accruing	416	1,615
Commercial | 60 to 89 Days
Loans past due, still accruing
Loans past due, still accruing	969	323
Commercial real estate
Loans past due, still accruing
Loans past due, still accruing	175
Non-accrual Loans	13,269	11,997
Commercial real estate | 30 to 59 Days
Loans past due, still accruing
Loans past due, still accruing	578	1,856
Commercial real estate | 60 to 89 Days
Loans past due, still accruing
Loans past due, still accruing	421	2,737
Real estate construction
Loans past due, still accruing
Non-accrual Loans	868	608
Retail real estate
Loans past due, still accruing
Loans past due, still accruing	799	933
Non-accrual Loans	8,506	6,714
Retail real estate | 30 to 59 Days
Loans past due, still accruing
Loans past due, still accruing	5,592	4,840
Retail real estate | 60 to 89 Days
Loans past due, still accruing
Loans past due, still accruing	1,513	1,355
Retail other
Loans past due, still accruing
Loans past due, still accruing	21
Non-accrual Loans	18	20
Retail other | 30 to 59 Days
Loans past due, still accruing
Loans past due, still accruing	15	166
Retail other | 60 to 89 Days
Loans past due, still accruing
Loans past due, still accruing	$ 2	$ 5

Portfolio loans - Impaired Loan

Portfolio loans - Impaired Loans (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)contractitem	Mar. 31, 2017contractitem	Dec. 31, 2017USD ($)
Loans
Number of contracts | contract	0	0
Minimum days past due for TDR loans to be classified as non-performing	90 days
Unpaid Contractual Principal Balance	$ 55,470		$ 52,419
Recorded Investment with No Allowance	41,223		39,657
Recorded Investment with Allowance	5,867		2,180
Total Recorded Investment	47,090		41,837
Related Allowance	3,368		867
Average Recorded Investment	41,198		39,124
Commercial
Loans
Unpaid Contractual Principal Balance	12,474		10,604
Recorded Investment with No Allowance	6,772		7,192
Recorded Investment with Allowance	3,297		191
Total Recorded Investment	10,069		7,383
Related Allowance	2,298		138
Average Recorded Investment	9,818		10,184
Commercial real estate
Loans
Unpaid Contractual Principal Balance	22,374		22,218
Recorded Investment with No Allowance	17,251		16,472
Recorded Investment with Allowance	2,545		1,964
Total Recorded Investment	19,796		18,436
Related Allowance	1,045		704
Average Recorded Investment	16,724		15,195
Real estate construction
Loans
Unpaid Contractual Principal Balance	1,294		1,040
Recorded Investment with No Allowance	1,270		1,016
Total Recorded Investment	1,270		1,016
Average Recorded Investment	847		692
Retail real estate
Loans
Unpaid Contractual Principal Balance	19,268		18,517
Recorded Investment with No Allowance	15,891		14,957
Recorded Investment with Allowance	25		25
Total Recorded Investment	15,916		14,982
Related Allowance	25		25
Average Recorded Investment	13,769		13,009
Retail other
Loans
Unpaid Contractual Principal Balance	60		40
Recorded Investment with No Allowance	39		20
Total Recorded Investment	39		20
Average Recorded Investment	$ 40		$ 44
In compliance with modified terms
Loans
Number of modifications for short-term principal payment relief | item	0	0

Portfolio loans - Adverse Loan

Portfolio loans - Adverse Loan Grading (Details) $ in Billions	3 Months Ended
	Mar. 31, 2018USD ($)item
Loans
The number of components contained in the general portion of the Company's allowance for loan losses	2
Number of quarters whose historical average is used to calculate the historical loss ratio	20
Balance of acquired loans which did not require a related allowance | $	$ 1.7
Substandard
Loans
Additional reserve (as a percent)	3.00%
Special Mention
Loans
Additional reserve (as a percent)	1.00%

Portfolio loans - Allowance for

Portfolio loans - Allowance for Loan Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Changes in allowance for loan losses
Beginning balance	$ 53,582	$ 47,795
Provision for loan loss	1,008	500
Charged-off	(2,930)	(1,232)
Recoveries	989	1,379
Ending Balance	52,649	48,442
Amount allocated to:
Loans individually evaluated for impairment			$ 3,368	$ 867
Loans collectively evaluated for impairment			49,281	52,715
Ending Balance	53,582	47,795	52,649	53,582
Loans:
Loans individually evaluated for impairment			40,135	31,191
Loans collectively evaluated for impairment			5,484,363	5,477,663
Ending Balance			5,531,453	5,519,500
Purchased Credit Impaired Loans
Loans:
Loans collectively evaluated for impairment			6,955	10,646
Commercial
Changes in allowance for loan losses
Beginning balance	14,779	13,303
Provision for loan loss	3,003	(649)
Charged-off	(781)	(103)
Recoveries	576	709
Ending Balance	17,577	13,260
Amount allocated to:
Loans individually evaluated for impairment			2,298	138
Loans collectively evaluated for impairment			15,279	14,641
Ending Balance	14,779	13,303	17,577	14,779
Loans:
Loans individually evaluated for impairment			9,277	6,572
Loans collectively evaluated for impairment			1,421,427	1,407,248
Ending Balance			1,431,496	1,414,631
Commercial | Purchased Credit Impaired Loans
Loans:
Loans collectively evaluated for impairment			792	811
Commercial real estate
Changes in allowance for loan losses
Beginning balance	21,813	20,623
Provision for loan loss	1,536	(220)
Charged-off	(1,315)	(588)
Recoveries	56	33
Ending Balance	22,090	19,848
Amount allocated to:
Loans individually evaluated for impairment			1,045	704
Loans collectively evaluated for impairment			21,045	21,109
Ending Balance	21,813	20,623	22,090	21,813
Loans:
Loans individually evaluated for impairment			16,359	11,491
Loans collectively evaluated for impairment			2,340,764	2,336,248
Ending Balance			2,360,560	2,354,684
Commercial real estate | Purchased Credit Impaired Loans
Loans:
Loans collectively evaluated for impairment			3,437	6,945
Real estate construction
Changes in allowance for loan losses
Beginning balance	2,861	1,870
Provision for loan loss	2	134
Charged-off	(97)
Recoveries	33	17
Ending Balance	2,799	2,021
Amount allocated to:
Loans collectively evaluated for impairment			2,799	2,861
Ending Balance	2,861	1,870	2,799	2,861
Loans:
Loans individually evaluated for impairment			689	435
Loans collectively evaluated for impairment			267,855	260,490
Ending Balance			269,125	261,506
Real estate construction | Purchased Credit Impaired Loans
Loans:
Loans collectively evaluated for impairment			581	581
Retail real estate
Changes in allowance for loan losses
Beginning balance	13,783	11,648
Provision for loan loss	(3,662)	1,220
Charged-off	(530)	(451)
Recoveries	245	561
Ending Balance	9,836	12,978
Amount allocated to:
Loans individually evaluated for impairment			25	25
Loans collectively evaluated for impairment			9,811	13,758
Ending Balance	13,783	11,648	9,836	13,783
Loans:
Loans individually evaluated for impairment			13,771	12,673
Loans collectively evaluated for impairment			1,428,046	1,445,819
Ending Balance			1,443,962	1,460,801
Retail real estate | Purchased Credit Impaired Loans
Loans:
Loans collectively evaluated for impairment			2,145	2,309
Retail other
Changes in allowance for loan losses
Beginning balance	346	351
Provision for loan loss	129	15
Charged-off	(207)	(90)
Recoveries	79	59
Ending Balance	347	335
Amount allocated to:
Loans collectively evaluated for impairment			347	346
Ending Balance	$ 346	$ 351	347	346
Loans:
Loans individually evaluated for impairment			39	20
Loans collectively evaluated for impairment			26,271	27,858
Ending Balance			$ 26,310	$ 27,878

OREO (Details)

OREO (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
OREO
Other Real Estate, Beginning Balance	$ 1,283	$ 2,518	$ 2,518
Additions, transfers from loans	348		1,417
Proceeds from sales of OREO	(639)	$ (3,229)	(5,024)
Gain on sales of OREO	9		1,632
Valuation allowance for OREO			(42)
Other Real Estate, Ending Balance	1,001		1,283
Commercial real estate
Foreclosed Real Estate
Other real estate owned (OREO)	700		1,200
Residential real estate
Foreclosed Real Estate
Other real estate owned (OREO)	300		100
Residential real estate in the process of foreclosure	$ 2,000
First Community
OREO
Additions, fair value from acquisition			722
Mid Illinois
OREO
Additions, fair value from acquisition			$ 60

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deposits
Demand deposits, noninterest-bearing	$ 1,651,333	$ 1,597,421
Interest-bearing transaction deposit	1,212,324	1,166,170
Saving deposits and money market deposits	2,058,639	2,026,212
Time deposits	1,408,878	1,336,162
Total deposits	6,331,174	6,125,965
Reciprocal brokered transaction deposits included in interest-bearing transaction deposits	48,200	45,400
Reciprocal brokered transaction deposits included in savings deposits and money market funds	127,300	127,500
Time deposits minimum denomination of $100,000 or more	570,800	578,900
Time deposits minimum denomination of $250,000 or more	224,100	197,900
Reciprocal brokered time deposits	59,100	62,000
Brokered deposits included in the balance of time deposits	250,000	247,700
Deposits
April 1, 2018 - March 31, 2019	949,961
April 1, 2019 - March 31, 2020	302,299
April 1, 2020 - March 31, 2021	60,717
April 1, 2021 - March 31, 2022	50,556
April 1, 2022 - March 31, 2023	45,273
Thereafter	72
Total	$ 1,408,878	$ 1,336,162

Borrowings - Maturity period (D

Borrowings - Maturity period (Details)	3 Months Ended
	Mar. 31, 2018
Maturity period
Maximum maturity period of short-term debt	1 year

Borrowings - Short-term borrowi

Borrowings - Short-term borrowings (Details) - Line of Credit - USD ($) $ in Millions	Apr. 30, 2018	May 05, 2017	Mar. 31, 2018	Dec. 31, 2017
Revolving loan facility
Short-term borrowings
Outstanding amounts			$ 0	$ 0
Second amendment to extend credit facility
Short-term borrowings
Maximum borrowing capacity		$ 40
Second amendment to extend credit facility | One-month LIBOR rate
Short-term borrowings
Annual interest rate (as a percentage)		2.50%
Third amendment to extend credit facility
Short-term borrowings
Maximum borrowing capacity	$ 20
Third amendment to extend credit facility | One-month LIBOR rate
Short-term borrowings
Annual interest rate (as a percentage)	1.75%

Borrowings - Securities sold un

Borrowings - Securities sold under agreements to repurchase and short-term borrowings (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Securities sold under agreements to repurchase
Balance at end of period	$ 235,311	$ 304,566
Weighted average interest rate at end of period (as a percent)	0.55%	0.57%
Maximum outstanding at any month end in year-to-date period	$ 267,596	$ 304,566
Average daily balance for the year-to-date period	$ 258,049	$ 213,527
Weighted average interest rate during period (as a percent)	0.54%	0.46%
Short-term borrowings
Balance at end of period		$ 220,000
FHLB advances
Short-term borrowings
Balance at end of period		$ 220,000
Weighted average interest rate at end of period		1.42%
Maximum outstanding at any month end in year-to-date period	$ 180,000	$ 234,600
Average daily balance for the year-to-date period	$ 123,889	$ 84,201
Weighted average interest rate during period	1.48%	1.20%

Borrowings - Long-term debt (De

Borrowings - Long-term debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Long-term debt
Long-term debt	$ 50,000	$ 50,000
FHLB advances
Long-term debt
Long-term debt	$ 50,000	$ 50,000
Weighted average rate (as a percent)	1.52%	1.19%
FHLB advances | Minimum
Long-term debt
Notes payable original maturity term	19 months	19 months
Interest rate (as a percent)	1.40%	1.10%
FHLB advances | Maximum
Long-term debt
Notes payable original maturity term	10 years	10 years
Interest rate (as a percent)	1.71%	1.32%

Borrowings - Senior notes and S

Borrowings - Senior notes and Subordinate notes (Details) - USD ($) $ in Millions	May 25, 2017	Mar. 31, 2018	Dec. 31, 2017	Jul. 02, 2017
Long-term debt
Unamortized debt issuance cost		$ 4.5	$ 4.1
Senior notes
Long-term debt
Issuance of debt	$ 40
Interest rate (as a percent)	3.75%
Unamortized debt issuance cost		0.6	0.6
Subordinated debt
Long-term debt
Issuance of debt	$ 60
Interest rate (as a percent)	4.75%
Term of debt	5 years
Unamortized debt issuance cost		$ 0.9	$ 1
Three-month LIBOR | Subordinated debt
Long-term debt
Floating interest rate margin (as a percent)	2.919%
First Community | Subordinated debt
Long-term debt
Assumed debt				$ 15.3
Debt instrument redeemed				9.8
Remaining assumed debt that was not redeemed				$ 5.5
Interest rate (as a percent)				8.625%
Purchase accounting premium				$ 0.3

Junior Subordinated Debt Owed61

Junior Subordinated Debt Owed to Unconsolidated Trusts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Junior subordinated debt owed to unconsolidated trusts
Junior subordinated debt owed to unconsolidated trusts	$ 71,044	$ 71,008
Trust Preferred Securities
Junior subordinated debt owed to unconsolidated trusts
Percentage limit on inclusion of qualifying trust preferred securities in Tier I Capital	25.00%
Trust preferred securities qualified as Tier I capital (as a percent)	100.00%
Maximum of holding companies assets retained	$ 15,000,000
Junior Subordinated Notes | Trust Preferred Securities
Junior subordinated debt owed to unconsolidated trusts
Maximum period to defer payment of interest on the notes and, therefore, distributions on the trust preferred securities	5 years
Parent
Junior subordinated debt owed to unconsolidated trusts
Junior subordinated debt owed to unconsolidated trusts	$ 71,000	$ 71,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income per share calculations for basic and diluted methods
Net income	$ 21,917	$ 15,170
Shares:
Weighted average common shares outstanding	48,775,000	38,293,000
Dilutive effect of outstanding options, warrants and restricted stock units as determined by the application of the treasury stock method (in shares)	404,000	461,000
Weighted average common shares outstanding, as adjusted for diluted earnings per share calculation	49,179,000	38,754,000
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.40
Diluted earnings per common share (in dollars per share)	$ 0.45	$ 0.39
Stock options
Anti-dilutive securities excluded from the calculation of common stock equivalents
Number of anti-dilutive securities (in shares)		10,850
Warrants
Anti-dilutive securities excluded from the calculation of common stock equivalents
Number of anti-dilutive securities (in shares)	191,278	191,278

Share-based Compensation (Detai

Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2015	Dec. 31, 2017	Feb. 03, 2015
Share-based Compensation
Number of shares held in treasury	468,342			500,638
Shares authorized for repurchase under stock repurchase plan					666,667
Purchase of treasury stock			333,333
Number of shares that may yet be purchased	333,334
Stock option awards
Shares
Outstanding at beginning of year (in shares)	213,428
Exercised (in shares)	(34,369)
Forfeited (in shares)	(6,985)
Expired (in shares)	(2,171)
Outstanding at end of year (in shares)	169,903
Exercisable at end of year (in shares)	126,987
Weighted-Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 16.97
Exercised (in dollars per share)	13.62
Forfeited (in dollars per share)	20.72
Expired (in dollars per share)	16.48
Outstanding at end of year (in dollars per share)	17.50
Exercisable at end of year (in dollars per share)	$ 15.47
Weighted-Average Remaining Contractual Term
Outstanding at end of period	4 years 3 months 7 days
Exercisable at end of period	2 years 9 months 18 days
Additional disclosures
Compensation expense recognized	$ 0.1
Unrecognized stock option expense	$ 0.4
Period over which cost will be recognized	1 year 7 months 6 days
RSU
Share-based Compensation
Number of shares of common stock per award	1
Shares
Non-vested at beginning of year (in shares)	587,763
Dividend equivalents earned (in shares)	3,765
Forfeited (in shares)	(834)
Non-vested at end of year (in shares)	590,694
Outstanding at end of year (in shares)	590,694
Weighted-Average Grant Date Fair Value
Non-vested at beginning of year (in dollars per share)	$ 22.68
Dividend equivalents earned (in dollars per share)	31.18
Forfeited (in dollars per share)	30.33
Non-vested at end of year (in dollars per share)	22.72
Outstanding at end of year (in dollars per share)	$ 22.72
RSU | Minimum
Share-based Compensation
Requisite service periods	1 year
RSU | Maximum
Share-based Compensation
Requisite service periods	5 years
DSUs
Shares
Non-vested at beginning of year (in shares)	42,411
Dividend equivalents earned (in shares)	770
Vested (in shares)	(498)
Non-vested at end of year (in shares)	42,683
Outstanding at end of year (in shares)	120,755
Weighted-Average Grant Date Fair Value
Non-vested at beginning of year (in dollars per share)	$ 25.47
Dividend equivalents earned (in dollars per share)	31.18
Vested (in dollars per share)	31.18
Non-vested at end of year (in dollars per share)	25.51
Outstanding at end of year (in dollars per share)	$ 21.06
DSUs | Directors
Share-based Compensation
Number of shares of common stock per award	1
Settlement period	30 days
RSUs and DSUs
Additional disclosures
Compensation expense recognized	$ 0.8	$ 0.5
Amount of compensation cost to be recognized	$ 7.7
Period over which cost will be recognized	3 years 4 months 24 days
Employee stock purchase plan
Additional disclosures
Remaining shares available for issuance	78,690
First Community 2016 Equity Incentive Plan
Additional disclosures
Remaining shares available for issuance	313,939
2010 Equity Incentive Plan
Additional disclosures
Remaining shares available for issuance	891,648

Outstanding Commitments and C64

Outstanding Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Credit Commitments and Contingencies
Liabilities for potential obligations under guarantees	$ 0	$ 0
Maximum
Credit Commitments and Contingencies
Term for guarantee	1 year
Commitments to extend credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk	$ 1,352,821	1,300,294
Standby letters of credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk	$ 35,452	$ 37,231

Capital (Details)

Capital (Details) - USD ($) $ in Thousands	Oct. 12, 2017	Jan. 01, 2019	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jul. 31, 2013
Total Capital (to Risk Weighted Assets), Amount
Actual			$ 847,408		$ 837,183
Minimum Capital Requirement with Capital Buffer			584,466		547,265
Minimum To Be Well Capitalized			$ 591,864		$ 591,638
Total Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)			14.32%		14.15%
Minimum Capital Requirement with Capital Buffer (as a percent)			9.875%		9.25%
Minimum To Be Well Capitalized (as a percent)			10.00%		10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount
Actual			$ 729,259		$ 718,101
Minimum Capital Requirement with Capital Buffer			466,093		428,937
Minimum To Be Well Capitalized			$ 473,492		$ 473,310
Tier 1 Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)			12.32%		12.14%
Minimum Capital Requirement with Capital Buffer (as a percent)			7.875%		7.25%
Minimum To Be Well Capitalized (as a percent)			8.00%		8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount
Actual			$ 655,259		$ 644,633
Minimum Capital Requirement with Capital Buffer			377,314		340,192
Minimum To Be Well Capitalized			$ 384,712		$ 384,565
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)			11.07%		10.90%
Minimum Capital Requirement with Capital Buffer (as a percent)			6.375%		5.75%
Minimum To Be Well Capitalized (as a percent)			6.50%		6.50%
Tier 1 Capital (to Average Assets), Amount
Actual			$ 729,259		$ 718,101
Minimum Capital Requirement with Capital Buffer			$ 295,060		$ 293,588
Tier 1 Capital (to Average Assets), Ratio
Actual (as a percent)			9.89%		9.78%
Minimum Capital Requirement with Capital Buffer (as a percent)			4.00%		4.00%
Busey Bank
Total Capital (to Risk Weighted Assets), Amount
Actual			$ 810,264		$ 704,807
Minimum Capital Requirement with Capital Buffer			581,090		509,978
Minimum To Be Well Capitalized			$ 588,446		$ 551,327
Total Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)			13.77%		12.78%
Minimum Capital Requirement with Capital Buffer (as a percent)			9.875%		9.25%
Minimum To Be Well Capitalized (as a percent)			10.00%		10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount
Actual			$ 757,615		$ 651,432
Minimum Capital Requirement with Capital Buffer			463,401		399,713
Minimum To Be Well Capitalized			$ 470,757		$ 441,062
Tier 1 Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)			12.87%		11.82%
Minimum Capital Requirement with Capital Buffer (as a percent)			7.875%		7.25%
Minimum To Be Well Capitalized (as a percent)			8.00%		8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount
Actual			$ 757,615		$ 651,432
Minimum Capital Requirement with Capital Buffer			375,134		317,013
Minimum To Be Well Capitalized			$ 382,490		$ 358,363
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)			12.87%		11.82%
Minimum Capital Requirement with Capital Buffer (as a percent)			6.375%		5.75%
Minimum To Be Well Capitalized (as a percent)			6.50%		6.50%
Tier 1 Capital (to Average Assets), Amount
Actual			$ 757,615		$ 651,432
Minimum Capital Requirement with Capital Buffer			293,809		265,847
Minimum To Be Well Capitalized			$ 367,262		$ 332,309
Tier 1 Capital (to Average Assets), Ratio
Actual (as a percent)			10.31%		9.80%
Minimum Capital Requirement with Capital Buffer (as a percent)			4.00%		4.00%
Minimum To Be Well Capitalized (as a percent)			5.00%		5.00%
South Side Bank
Total Capital (to Risk Weighted Assets), Amount
Actual					$ 84,914
Minimum Capital Requirement with Capital Buffer					34,744
Minimum To Be Well Capitalized					$ 37,561
Total Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)					22.61%
Minimum Capital Requirement with Capital Buffer (as a percent)					9.25%
Minimum To Be Well Capitalized (as a percent)					10.00%
Tier 1 Capital (to Risk Weighted Assets), Amount
Actual					$ 84,707
Minimum Capital Requirement with Capital Buffer					27,232
Minimum To Be Well Capitalized					$ 30,049
Tier 1 Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)					22.55%
Minimum Capital Requirement with Capital Buffer (as a percent)					7.25%
Minimum To Be Well Capitalized (as a percent)					8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Amount
Actual					$ 84,707
Minimum Capital Requirement with Capital Buffer					21,598
Minimum To Be Well Capitalized					$ 24,415
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio
Actual (as a percent)					22.55%
Minimum Capital Requirement with Capital Buffer (as a percent)					5.75%
Minimum To Be Well Capitalized (as a percent)					6.50%
Tier 1 Capital (to Average Assets), Amount
Actual					$ 84,707
Minimum Capital Requirement with Capital Buffer					26,571
Minimum To Be Well Capitalized					$ 33,214
Tier 1 Capital (to Average Assets), Ratio
Actual (as a percent)					12.75%
Minimum Capital Requirement with Capital Buffer (as a percent)					4.00%
Minimum To Be Well Capitalized (as a percent)					5.00%
Dodd-Frank Act ("Basel III Rules")
Regulatory Capital
Maximum consolidated assets of bank holding companies						$ 1,000,000
Maximum consolidated assets size of bank holding companies potentially unaffected by certain Tier 1 capital restrictions			$ 15,000,000
Common Equity Tier 1 capital conservation buffer of risk weighted assets			2.50%
Tier 1 Capital (to Average Assets), Ratio
Increase in minimum capital requirement ratios				1.875%
Forecast
Total Capital (to Risk Weighted Assets), Ratio
Minimum Capital Requirement with Capital Buffer (as a percent)		10.50%
Tier 1 Capital (to Risk Weighted Assets), Ratio
Minimum Capital Requirement with Capital Buffer (as a percent)		8.50%
Common Equity Tier 1 Capital (to Risk Weighted Assets), Ratio
Minimum Capital Requirement with Capital Buffer (as a percent)		7.00%
Busey Bank
Regulatory Capital
Distribution received through chartered amendment	$ 40,000

Operating Segments and Relate66

Operating Segments and Related Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)segment	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Operating Segments and Related Information
Number of reportable segments | segment	3
Number of operating segments | segment	3
Goodwill	$ 267,685		$ 269,346
Total Assets	7,778,746		7,860,640
Net interest income:	59,757	$ 42,013
Non-interest income:	22,486	20,014
Non-interest expense:	51,040	37,619
Income before income taxes:	30,195	23,908
Net income:	21,917	15,170
Operating segments | Banking
Operating Segments and Related Information
Goodwill	246,999		248,660
Total Assets	7,722,957		7,809,738
Net interest income:	61,416	42,542
Non-interest income:	10,897	10,454
Non-interest expense:	41,386	29,290
Income before income taxes:	29,919	23,206
Net income:	21,845	14,749
Operating segments | Remittance Processing
Operating Segments and Related Information
Goodwill	8,992		8,992
Total Assets	35,465		34,646
Net interest income:	16	14
Non-interest income:	3,783	3,024
Non-interest expense:	2,466	2,112
Income before income taxes:	1,333	926
Net income:	953	554
Operating segments | Wealth Management
Operating Segments and Related Information
Goodwill	11,694		11,694
Total Assets	31,200		32,077
Net interest income:	94	56
Non-interest income:	8,641	7,017
Non-interest expense:	4,911	3,964
Income before income taxes:	3,824	3,109
Net income:	2,764	1,848
Other
Operating Segments and Related Information
Total Assets	(10,876)		$ (15,821)
Net interest income:	(1,769)	(599)
Non-interest income:	(835)	(481)
Non-interest expense:	2,277	2,253
Income before income taxes:	(4,881)	(3,333)
Net income:	$ (3,645)	$ (1,981)

Derivative Financial Instrume67

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Interest Rate Lock Commitments
Derivative Financial Instruments
Aggregate notional amount	$ 72,100		$ 51,700
Forward Sales Commitments
Derivative Financial Instruments
Aggregate notional amount	90,900		139,700
Interest rate lock commitments and forward sales commitments
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Net (losses) gains	(322)	$ 74
Interest rate lock commitments and forward sales commitments | Non-interest income
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross gains	732	3,865
Interest rate lock commitments and forward sales commitments | Non-interest expense
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross (losses)	(1,054)	$ (3,791)
Interest rate lock commitments and forward sales commitments | Other assets
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	732		675
Interest rate lock commitments and forward sales commitments | Other liabilities
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other liabilities	972		2,148
Interest rate swap
Derivative Financial Instruments
Aggregate notional amount	170,700		161,300
Variable rate, commercial loans that are supported by the interest rate swap contracts	85,400		80,700
Derivative cash pledged			2,000
Derivative securities pledged	300		400
Interest rate swap | Non-interest income
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross gains	954
Interest rate swap | Non-interest expense
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income
Gross (losses)	(954)
Interest rate swap | Other assets
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	1,216		262
Interest rate swap | Other liabilities
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other liabilities	$ 1,216		$ 262

Fair Value Measurements - Gener

Fair Value Measurements - General Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financial assets and financial liabilities measured at fair value
Transfers between levels of fair value hierarchy	$ 0
Securities available for sale	822,101	$ 872,682
Loans held for sale	29,034	94,848
U.S. Treasury securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	60,064	60,348
Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Securities available for sale	96,193	103,665
Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Securities available for sale	260,990	280,199
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	372,898	397,436
Corporate debt securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	31,956	31,034
Recurring basis
Financial assets and financial liabilities measured at fair value
Loans held for sale	29,034	94,848
Recurring basis | Derivative assets
Financial assets and financial liabilities measured at fair value
Fair value recorded in other assets	1,948	937
Recurring basis | Derivative liabilities
Financial assets and financial liabilities measured at fair value
Fair value recorded in other liabilities	2,188	2,410
Recurring basis | U.S. Treasury securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	60,064	60,348
Recurring basis | Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Securities available for sale	96,193	103,665
Recurring basis | Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Securities available for sale	260,990	280,199
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	372,898	397,436
Recurring basis | Corporate debt securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	31,956	31,034
Recurring basis | Securities equity investments
Financial assets and financial liabilities measured at fair value
Securities available for sale	5,028	5,378
Recurring basis | Level 1 | Securities equity investments
Financial assets and financial liabilities measured at fair value
Securities available for sale	5,028	5,378
Recurring basis | Level 2
Financial assets and financial liabilities measured at fair value
Loans held for sale	29,034	94,848
Recurring basis | Level 2 | Derivative assets
Financial assets and financial liabilities measured at fair value
Fair value recorded in other assets	1,948	937
Recurring basis | Level 2 | Derivative liabilities
Financial assets and financial liabilities measured at fair value
Fair value recorded in other liabilities	2,188	2,410
Recurring basis | Level 2 | U.S. Treasury securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	60,064	60,348
Recurring basis | Level 2 | Obligations of U.S. government corporations and agencies
Financial assets and financial liabilities measured at fair value
Securities available for sale	96,193	103,665
Recurring basis | Level 2 | Obligations of states and political subdivisions
Financial assets and financial liabilities measured at fair value
Securities available for sale	260,990	280,199
Recurring basis | Level 2 | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	372,898	397,436
Recurring basis | Level 2 | Corporate debt securities
Financial assets and financial liabilities measured at fair value
Securities available for sale	$ 31,956	$ 31,034

Fair Value Measurements - Addit

Fair Value Measurements - Additional Quantitative Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	$ 47,090	$ 41,837
Non-recurring basis
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	2,499	1,313
Non-recurring basis | Level 3
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	2,499	1,313
Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	$ 2,499	$ 1,313
Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans | Minimum
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(18.70%)	(20.30%)
Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans | Maximum
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(100.00%)	(100.00%)
Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans | Weighted Average
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(48.40%)	(30.80%)
Non-recurring basis | Level 3 | Appraisal of collateral | OREO
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(100.00%)	(100.00%)
Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Weighted Average
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(100.00%)	(100.00%)

Fair Value Measurements - By Le

Fair Value Measurements - By Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets:
Cash and cash equivalents	$ 367,525	$ 353,272
Securities held to maturity	450,129	441,052
Portfolio loans, net	5,478,804	5,465,918
Financial liabilities:
Short-term borrowings		220,000
Junior subordinated debt owed to unconsolidated trusts	71,044	71,008
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	367,525	353,272
Level 1 | Fair Value
Financial assets:
Cash and cash equivalents	367,525	353,272
Level 2 | Carrying Amount
Financial assets:
Securities held to maturity	459,007	443,550
Accrued interest receivable	21,507	22,591
Financial liabilities:
Time deposits	1,408,878
Deposits		6,125,965
Securities sold under agreements to repurchase	235,311	304,566
Short-term borrowings		220,000
Long-term debt	50,000	50,000
Junior subordinated debt owed to unconsolidated trusts	71,044	71,008
Accrued interest payable	4,131	2,581
Level 2 | Fair Value
Financial assets:
Securities held to maturity	450,129	441,052
Accrued interest receivable	21,507	22,591
Financial liabilities:
Time deposits	1,397,240
Deposits		6,119,135
Securities sold under agreements to repurchase	235,311	304,566
Short-term borrowings		220,000
Long-term debt	50,000	50,000
Junior subordinated debt owed to unconsolidated trusts	71,044	71,008
Accrued interest payable	4,131	2,581
Level 3 | Carrying Amount
Financial assets:
Portfolio loans, net	5,478,804	5,465,918
Mortgage servicing rights	3,545	3,680
Other servicing rights	353	280
Level 3 | Fair Value
Financial assets:
Portfolio loans, net	5,433,076	5,361,406
Mortgage servicing rights	10,745	8,635
Other servicing rights	947	901
Level 3 | Senior notes | Carrying Amount
Financial liabilities:
Long-term debt	39,438	39,404
Level 3 | Senior notes | Fair Value
Financial liabilities:
Long-term debt	38,477	39,104
Level 3 | Subordinated debt | Carrying Amount
Financial liabilities:
Long-term debt	64,684	64,715
Level 3 | Subordinated debt | Fair Value
Financial liabilities:
Long-term debt	$ 63,366	$ 64,350

Liability for Loans Sold (Detai

Liability for Loans Sold (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Period after origination for an event of default that may require loan repurchase or reimbursement	90 days
Period after breach of contractual representations or warranties made at the time of sale that are not remedied after the Company receives notice that may require possible loan repurchase or loan reimbursement	90 days
The period after origination for profit refund if the borrower pays off loan	120 days
Other liabilities
Liability for loans sold	$ 2.2	$ 2.1