Equity Bancshares (EQBK) 10-K 20 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 12, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	EQBK
Entity Registrant Name	EQUITY BANCSHARES INC
Entity Central Index Key	0001227500
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Public Float			$ 621.3
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		15,803,587
Class B Non-Voting Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 192,735	$ 48,034
Federal funds sold	83	4,161
Cash and cash equivalents	192,818	52,195
Interest-bearing time deposits in other banks	4,991	3,496
Available-for-sale securities	168,875	162,272
Held-to-maturity securities, fair value of $739,989 and $532,744	748,356	535,462
Loans held for sale	2,972	2,353
Loans, net of allowance for loan losses of $11,454 and $8,498	2,563,954	2,108,772
Other real estate owned, net	6,372	7,907
Premises and equipment, net	80,442	63,449
Bank-owned life insurance	73,105	68,384
Federal Reserve Bank and Federal Home Loan Bank stock	29,214	24,373
Interest receivable	17,372	12,371
Goodwill	131,712	104,907
Core deposit intangibles, net	21,725	10,738
Other	19,808	13,830
Total assets	4,061,716	3,170,509
Deposits
Demand	503,831	366,530
Total non-interest-bearing deposits	503,831	366,530
Savings, NOW and money market	1,611,710	1,238,984
Time	1,007,906	776,499
Total interest-bearing deposits	2,619,616	2,015,483
Total deposits	3,123,447	2,382,013
Federal funds purchased and retail repurchase agreements	50,068	37,492
Federal Home Loan Bank advances	384,898	347,692
Bank stock loan	15,450	2,500
Subordinated debentures	14,260	13,968
Contractual obligations	3,965	1,967
Interest payable and other liabilities	13,687	10,733
Total liabilities	3,605,775	2,796,365
Commitments and contingent liabilities
Stockholders' equity
Common stock	173	161
Additional paid-in capital	379,085	331,339
Retained earnings	101,326	65,512
Accumulated other comprehensive loss	(4,867)	(3,092)
Employee stock loans	(121)	(121)
Treasury stock	(19,655)	(19,655)
Total stockholders’ equity	455,941	374,144
Total liabilities and stockholders’ equity	$ 4,061,716	$ 3,170,509

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Held-to-maturity securities, fair value	$ 739,989	$ 532,744
Loans, allowance for loan losses	$ 11,454	$ 8,498	$ 6,432	$ 5,506

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest and dividend income
Loans, including fees	$ 137,048	$ 85,662	$ 50,272
Securities, taxable	17,943	12,308	8,111
Securities, nontaxable	4,089	3,375	1,654
Federal funds sold and other	2,476	1,348	1,762
Total interest and dividend income	161,556	102,693	61,799
Interest expense
Deposits	25,687	12,722	7,042
Federal funds purchased and retail repurchase agreements	114	64	58
Federal Home Loan Bank advances	9,039	2,909	1,400
Bank stock loan	731	16	31
Subordinated debentures	1,187	980	671
Total interest expense	36,758	16,691	9,202
Net interest income	124,798	86,002	52,597
Provision for loan losses	3,961	2,953	2,119
Net interest income after provision for loan losses	120,837	83,049	50,478
Non-interest income
Increase in value of bank-owned life insurance	2,199	1,445	1,000
Net gains on sales and settlements of securities	(9)	271	479
Other	2,809	1,903	1,085
Total non-interest income	19,725	15,440	10,466
Non-interest expense
Salaries and employee benefits	48,018	33,960	21,951
Net occupancy and equipment	8,126	6,305	4,586
Data processing	8,094	4,927	3,568
Professional fees	3,402	2,363	2,075
Advertising and business development	3,002	2,105	1,198
Telecommunications	1,775	1,191	1,101
FDIC insurance	1,536	945	894
Courier and postage	1,183	935	683
Free nationwide ATM cost	1,355	932	672
Amortization of core deposit intangibles	2,443	1,025	413
Loan expense	1,005	993	599
Other real estate owned	(71)	523	386
Loss on debt extinguishment			58
Merger expenses	7,462	5,352	5,294
Other	7,057	5,907	3,597
Total non-interest expense	94,387	67,463	47,075
Income before income tax	46,175	31,026	13,869
Provision for income taxes	10,350	10,377	4,495
Net income	35,825	20,649	9,374
Dividends and discount accretion on preferred stock			(1)
Net income allocable to common stockholders	$ 35,825	$ 20,649	$ 9,373
Basic earnings per share	$ 2.33	$ 1.66	$ 1.09
Diluted earnings per share	$ 2.28	$ 1.62	$ 1.07
Service Charges and Fees [Member]
Non-interest income
Non-interest income	$ 7,250	$ 5,319	$ 3,610
Debit Card Income [Member]
Non-interest income
Non-interest income	6,178	4,547	2,898
Mortgage Banking [Member]
Non-interest income
Non-interest income	$ 1,298	$ 1,955	$ 1,394

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 35,825	$ 20,649	$ 9,374
Other comprehensive income:
Unrealized holding gains (losses) arising during the period on available-for-sale securities	(2,845)	(26)	(264)
Amortization of unrealized losses on held-to-maturity securities	453	532	615
Reclassification adjustment for net gains included in net income	0	(271)	(893)
Total other comprehensive income (loss)	(2,392)	235	(542)
Tax effect	606	(90)	211
Other comprehensive income (loss), net of tax	(1,786)	145	(331)
Comprehensive income	$ 34,039	$ 20,794	$ 9,043

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Prairie State Bancshares, Inc. [Member]	Eastman National Bancshares, Inc. [Member]	Cache Holdings, Inc. [Member]	Kansas Bank Corporation [Member]	Adams Dairy Bancshares, Inc. [Member]	Community First Bancshares, Inc. [Member]	Private Placement [Member]	Preferred Stock, Series C [Member]	Common Stock [Member]	Common Stock [Member]Prairie State Bancshares, Inc. [Member]	Common Stock [Member]Eastman National Bancshares, Inc. [Member]	Common Stock [Member]Cache Holdings, Inc. [Member]	Common Stock [Member]Kansas Bank Corporation [Member]	Common Stock [Member]Adams Dairy Bancshares, Inc. [Member]	Common Stock [Member]Community First Bancshares, Inc. [Member]	Common Stock [Member]Private Placement [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member]Prairie State Bancshares, Inc. [Member]	Additional Paid-In Capital [Member]Eastman National Bancshares, Inc. [Member]	Additional Paid-In Capital [Member]Cache Holdings, Inc. [Member]	Additional Paid-In Capital [Member]Kansas Bank Corporation [Member]	Additional Paid-In Capital [Member]Adams Dairy Bancshares, Inc. [Member]	Additional Paid-In Capital [Member]Community First Bancshares, Inc. [Member]	Additional Paid-In Capital [Member]Private Placement [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Employee Stock Loans [Member]
Beginning balance at Dec. 31, 2015	$ 167,233								$ 16,372	$ 97								$ 138,077								$ 34,955	$ (2,371)	$ (19,655)	$ (242)
Beginning balance, shares at Dec. 31, 2015										8,211,727
Net income	9,374																									9,374
Other comprehensive income, net of tax effects	(331)																										(331)
Retirement of preferred stock	(16,372)								$ (16,372)
Stock based compensation	553																	553
Stock based compensation, shares										953
Common stock issued upon exercise of stock options	125																	125
Common stock issued upon exercise of stock options, shares										7,938
Common stock issued in connection with the acquisition, net of issuance expenses							$ 73,740									$ 27								$ 73,713
Common stock issued in connection with the acquisition, net of issuance expenses, shares																2,689,690
Common stock issued, net of issuance expenses								$ 23,643									$ 8								$ 23,635
Common stock issued, net of issuance expenses, shares																	770,000
Cash dividends declared and accrued on preferred stock	(1)																									(1)
Ending balance at Dec. 31, 2016	257,964									$ 132								236,103								44,328	(2,702)	(19,655)	(242)
Ending balance, shares at Dec. 31, 2016										11,680,308
Net income	20,649																									20,649
Other comprehensive income, net of tax effects	145																										145
Other comprehensive income tax rate change impact	535																									535	(535)
Stock based compensation	1,100																	1,100
Stock based compensation, shares										3,712
Common stock issued upon exercise of stock options	1,215									$ 1								1,214
Common stock issued upon exercise of stock options, shares										71,434
Repayments on employee stock loans	121																												121
Common stock issued in connection with the acquisition, net of issuance expenses		$ 14,913	$ 38,809	$ 39,228							$ 5	$ 11	$ 12						$ 14,908	$ 38,798	$ 39,216
Common stock issued in connection with the acquisition, net of issuance expenses, shares											479,465	1,179,747	1,190,941
Ending balance at Dec. 31, 2017	374,144									$ 161								331,339								65,512	(3,092)	(19,655)	(121)
Ending balance, shares at Dec. 31, 2017										14,605,607
Net income	35,825																									35,825
Other comprehensive income, net of tax effects	(1,786)																										(1,786)
Stock based compensation	2,509																	2,509
Stock based compensation, shares										1,375
Common stock issued upon exercise of stock options	133																	133
Common stock issued upon exercise of stock options, shares										21,201
Adoption of ASU 2016-01 reclassifying AFS equity securities with readily determined fair value																										(11)	11
Common stock issued in connection with the acquisition, net of issuance expenses					$ 31,896	$ 13,220								$ 8	$ 4							$ 31,888	$ 13,216
Common stock issued in connection with the acquisition, net of issuance expenses, shares														820,849	344,063
Ending balance at Dec. 31, 2018	$ 455,941									$ 173								$ 379,085								$ 101,326	$ (4,867)	$ (19,655)	$ (121)
Ending balance, shares at Dec. 31, 2018										15,793,095

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Private Placement [Member]
Issuance expense on issuance of common stock			$ 1,382
Community First Bancshares, Inc. [Member]
Issuance expense on issuance of common stock			$ 549
Prairie State Bancshares, Inc. [Member]
Issuance expense on issuance of common stock		$ 329
Eastman National Bancshares, Inc. [Member]
Issuance expense on issuance of common stock		300
Cache Holdings, Inc. [Member]
Issuance expense on issuance of common stock		$ 252
Kansas Bank Corporation [Member]
Issuance expense on issuance of common stock	$ 207
Adams Dairy Bancshares, Inc. [Member]
Issuance expense on issuance of common stock	$ 236

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 35,825	$ 20,649	$ 9,374
Adjustments to reconcile net income to net cash from operating activities:
Stock based compensation	2,509	1,100	553
Depreciation	3,130	2,496	1,764
Provision for loan losses	3,961	2,953	2,119
Net amortization (accretion) of purchase valuation adjustments	(5,586)	(4,518)	615
Amortization (accretion) of premiums and discounts on securities	3,062	2,869	3,049
Amortization of intangible assets	2,492	1,070	419
Deferred income taxes	3,483	2,621	909
Federal Home Loan Bank stock dividends	(1,402)	(760)	(657)
Loss (gain) on sales and valuation adjustments on other real estate owned	(580)	(109)	(112)
Net loss (gain) on sales and settlements of securities	(1)	(271)	(479)
Change in unrealized (gains)/losses on equity securities	11
Loss (gain) on disposal of premises and equipment	(182)	(5)	(42)
Loss (gain) on sales of foreclosed assets	(17)	32
Loss (gain) on sales of loans	(1,072)	(1,640)	(1,198)
Originations of loans held for sale	(48,576)	(73,961)	(51,369)
Proceeds from the sale of loans held for sale	48,271	78,077	51,241
Increase in the value of bank-owned life insurance	(2,199)	(1,445)	(1,000)
Change in fair value of derivatives recognized in earnings	271	(14)	6
Net change in:
Interest receivable	(2,255)	(1,276)	(544)
Other assets	(5,738)	(673)	885
Interest payable and other liabilities	1,259	433	15
Net cash provided by operating activities	36,666	27,628	15,548
Cash flows (to) from investing activities
Purchases of available-for-sale securities	(36,007)	(105,749)	(56,391)
Purchases of held-to-maturity securities	(150,479)	(129,016)	(134,745)
Proceeds from sales, calls, pay-downs and maturities of available-for- sale securities	58,739	102,040	90,459
Proceeds from calls, pay-downs and maturities of held-to-maturity securities	73,098	58,245	51,439
Net change in interest-bearing time deposits in other banks	2,742	1,242	1,495
Net change in loans	(135,500)	(125,679)	(73,932)
Purchase of premises and equipment	(8,831)	(6,873)	(2,796)
Proceeds from sale of premises and equipment	1,254	9	209
Proceeds from sale of foreclosed assets	217	165
Net redemptions (purchases) of Federal Home Loan Bank and Federal Reserve Bank stock	(1,891)	(4,276)	(1,973)
Proceeds from sale of other real estate owned	4,730	5,461	3,017
Purchase of bank-owned life insurance		(15,000)	(14,500)
Proceeds from bank-owned life insurance death benefits	347
Net cash (used in) investing activities	(171,488)	(222,924)	(140,689)
Cash flows (to) from financing activities
Net increase (decrease) in deposits	228,924	123,224	39,082
Net change in federal funds purchased and retail repurchase agreements	12,576	8,177	(4,150)
Net borrowings (repayments) on Federal Home Loan Bank line of credit	20,078	79,996	114,149
Principal repayments on Federal Home Loan Bank term advances	(1,214)	(1,300)	(25,221)
Borrowings on bank stock loan	22,500	2,500	6,000
Principal repayments on bank stock loan	(9,550)	(1,000)	(33,218)
Proceeds from issuance of common stock, net			23,643
Proceeds from exercise of employee stock options	133	1,215	112
Principal payments on employee stock loan		121
Redemption of Series C preferred stock			(16,372)
Net change in contractual obligations	1,998	(537)	(589)
Dividends paid on preferred stock			(42)
Excess tax benefits as a result of the exercise of employee stock options			13
Net cash provided by (used in) financing activities	275,445	212,396	103,407
Net change in cash and cash equivalents	140,623	17,100	(21,734)
Cash and cash equivalents, beginning of period	52,195	35,095	56,829
Ending cash and cash equivalents	192,818	52,195	35,095
Supplemental cash flow information:
Interest paid	32,667	15,041	8,943
Income taxes paid, net of refunds	9,214	6,438	3,212
Supplemental noncash disclosures:
Other real estate owned acquired in settlement of loans	2,307	4,562	3,006
Community First Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition			(2,971)
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash			496,352
Total fair value of liabilities acquired			$ 419,641
Prairie State Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition		(6,744)
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash		147,247
Total fair value of liabilities acquired		125,591
Eastman National Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition	(55)	6,108
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash		267,094
Total fair value of liabilities acquired		234,337
Cache Holdings, Inc. [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition		(2,857)
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash		333,140
Total fair value of liabilities acquired		$ 291,056
Kansas Bank Corporation [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition	12,774
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash	308,225
Total fair value of liabilities acquired	289,103
Adams Dairy Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition	(1,385)
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash	117,010
Total fair value of liabilities acquired	102,406
City Bank and Trust Company [Member]
Cash flows (to) from investing activities
Net cash (paid)/from acquisition	8,759
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash	135,594
Total fair value of liabilities acquired	$ 144,353

NATURE OF OPERATIONS AND SUMMAR

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 1 – NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations Equity Bank is a Kansas state-chartered bank and member of the Federal Reserve (state Fed member bank jointly supervised by both the Federal Reserve Bank of Kansas City and the Office of the Kansas State Bank Commissioner). The Company is primarily engaged in providing a full range of banking, mortgage banking and financial services to individual and corporate customers generally in Arkansas, Kansas, Missouri and Oklahoma. Equity Bank competes with a variety of other financial institutions including large regional banks, community banks and thrifts as well as credit unions and other non-traditional lenders. Use of Estimates Cash Equivalents Securities Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield basis without anticipating prepayments, except for certain securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. All OTTI related to equity securities is recognized through earnings. Equity investments with a readily determinable fair value are measured at fair value with changes in fair value recognized in net income. The exit price concept is used when measuring the fair value of financial instruments for disclosure purposes. Loans Held for Sale Loans Purchased Credit Impaired Loans. As a part of acquisitions, the Company acquired certain loans, for which there was, at acquisition, evidence of deterioration of credit quality since origination. These purchased credit impaired loans were recorded at the acquisition date fair value, such that there is no carryover of the seller’s allowance for loan losses. After acquisition, losses are recognized by an increase in the allowance for loan losses. Such purchase credit impaired loans are accounted for individually. The Company estimates the amount and timing of expected cash flows for each loan, and the expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loan (accretable yield). During acquisitions, if the Company expects to liquidate the loan collateral in a relatively short period of time, the Company will assign no value to accretable yield as the impact is immaterial. The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (non-accretable difference). Over the life of the loan, expected cash flows continue to be estimated. If the present value of the expected cash flows is less than the carrying amount, a loss is recorded. If the present value of the expected cash flows is greater than the carrying amount, it is recognized as part of future interest income. Nonaccrual Loans. Generally, loans are designated as nonaccrual when either principal or interest payments are 90 days or more past due based on contractual terms unless the loan is well secured and in the process of collection. Consumer loans are typically charged off no later than 180 days past due. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed against income. Future interest income may be recorded on a cash basis after recovery of principal is reasonably assured. Nonaccrual loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Impaired Loans. A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect all contractual principal and interest due according to the terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or on the value of the underlying collateral if the loan is collateral dependent. The Company evaluates the collectability of both principal and interest when assessing the need for a loss accrual. 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. Troubled Debt Restructurings . In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructured loan and classified as impaired. Generally, a nonaccrual loan that is a troubled debt restructuring remains on nonaccrual until such time that repayment of the remaining principal and interest is not in doubt and the borrower has a period of satisfactory repayment performance. Allowance for Loan Losses The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported net at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the sale of the collateral. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component of the allowance for loan losses covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio and class and is based on the actual loss history experienced by the Company. This actual loss experience is then adjusted by comparing current conditions to the conditions that existed during the loss history. The Company considers the changes related to (i) lending policies, (ii) economic conditions, (iii) nature and volume of the loan portfolio and class, (iv) lending staff, (v) volume and severity of past due, non-accrual, and risk graded loans, (vi) loan review system, (vii) value of underlying collateral for collateral dependent loans, (viii) concentration levels and (ix) effects of other external factors. The Company considers loan performance and collateral values in assessing risk for each class in the loan portfolio, as follows: • Commercial and industrial loans are dependent on the strength of the industries of the related borrowers and the success of their businesses. Commercial and industrial loans are advanced for equipment purchases, to provide working capital or meet other financing needs of the business. These loans may be secured by accounts receivable, inventory, equipment or other business assets. Financial information is obtained from the borrower to evaluate the debt service coverage and ability to repay the loans. • Commercial real estate loans are dependent on the industries tied to these loans, as well as the local commercial real estate market. The loans are secured by real estate and typically appraisals are obtained to support the loan amount. Generally, an evaluation of the project’s cash flows is performed to evaluate the borrower’s ability to repay the loan at the time of origination and periodically updated during the life of the loan. • Residential real estate loans are affected by the local residential real estate market, the local economy and movement in interest rates. The Company evaluates the borrower’s repayment ability through a review of credit reports and debt to income ratios. Generally, appraisals are obtained to support the loan amount. • Agricultural real estate loans are real estate loans related to farmland and are affected by the value of farmland. Generally, the Company evaluates the borrower’s ability to repay based on cash flows from farming operations. • Consumer loans are dependent on the local economy. Consumer loans are generally secured by consumer assets, but may be unsecured. Typically, the Company evaluates the borrower’s repayment ability through a review of credit scores and an evaluation of debt to income ratios. • Agricultural loans are primary operating lines subject to annual farming revenues, including productivity and yield of the farm products and market pricing at the time of sale. There have been no material changes to the Company’s accounting policies related to its allowance for loan loss methodology during 2018 and 2017. Transfers of Financial Assets Bank-Owned Life Insurance Other Real Estate Owned Premises and Equipment Premises and equipment and other long-term assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value. Federal Reserve Bank and Federal Home Loan Bank Stock Goodwill and Core Deposit Intangibles Credit Related Financial Instruments Derivatives An interest rate swap is an agreement between two entities to exchange cash flows in the future. The agreement sets the dates on which the cash flows will be paid and the manner in which the cash flows will be calculated. Typically, an interest rate swap transaction is used as an exchange of cash flows based on a fixed rate for cash flows based on a variable rate. In an interest rate cap agreement, a cash flow is generated if the price or interest rate of an underlying variable rises above a certain threshold price or interest rate. In an interest rate floor agreement, a cash flow is generated if the price or interest rate of an underlying variable falls below a certain threshold price or interest rate. Caps and floors are designed as protection against the interest rate on a variable rate asset or liability rising above or falling below a certain level. At the inception of a derivative contract, the Company designates the derivatives as one of three types based on the Company’s intentions and belief as to likely effectiveness as a hedge. These three types are: (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”); (2) a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”); or (3) an instrument with no hedging designation (“stand-alone derivative”). For a fair value hedge, the gain or loss on the derivative, as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair value changes. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income and is reclassified into earnings in the same periods during which the hedged transaction affects earnings. For both types of hedges, changes in the fair value of derivatives that are not highly effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings as non-interest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in non-interest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged unless the derivative meets the criteria to be a financing derivative. All derivatives are recognized in the consolidated balance sheet at their fair values and are reported as either derivative assets or derivative liabilities net of accrued net settlements and collateral, if any. The individual derivative amounts are netted by counterparty when the netting requirements have been met. If these netted values are positive, they are classified as an asset and, if negative, they are classified as a liability. The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, at least quarterly, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm or treatment of the derivative as a hedge is no longer appropriate or intended. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that are accumulated in other comprehensive income are amortized into earnings over the same periods which the hedged transactions will affect earnings. The Company has entered into interest rate cap derivatives to assist with interest rate risk management. These derivatives are not designated as hedging instruments but rather as stand-alone derivatives. The fair values of stand-alone derivatives are included in other assets and other liabilities. Changes in fair value of stand-alone derivatives are recorded through earnings as non-interest income. Income Taxes As a result of Tax Reform enacted in December 2017, the Company recognized a $1,086 re-measurement of its net deferred tax assets, including a re-measurement of $535 in a net deferred tax asset related to unrealized losses on available-for-sale securities and held-to-maturity securities previously transferred from available-for-sale. Because the tax effect of variations in unrealized losses on available-for-sale securities and transferred held-to-maturity securities impact accumulated other comprehensive income, the Company had a stranded tax effect of $535 as of the date of enactment. The Company elected to early adopt ASU 2018-02 resulting in a reclassification of $535 from accumulated other comprehensive income to retained earnings in December 2017. The Company recognizes interest and/or penalties related to income tax matters in income tax expense. During 2016 there was $1 paid to the Missouri Department of Revenue. No such interest or penalties were incurred in 2018 or 2017. Earnings Per Common Share Share-Based Payments Compensation expense associated with restricted stock units is based on the fair value of the units at the grant date. This compensation expense is recognized ratably over the service period stipulated in the grant agreement. Comprehensive Income Loss Contingencies Restrictions on Cash Dividend Restriction Fair Value Segment Information Revenue Recognition Revenue from Contracts with Customers The Company adopted ASC 606 using the modified retrospective method applied to all contracts not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018, are presented under ASC 606, while prior period amounts continue to be reported in accordance with legacy GAAP. The adoption of ASC 606 did not result in a change to the accounting for any of the in-scope revenue streams; as such, no cumulative effect adjustment was recorded. Except for gains or losses from the sale of OREO, all of the Company’s revenue from contracts with customers within the scope of ASC 606 is recognized in non-interest income. The following table presents the Company’s sources of non-interest income for the twelve months ended December 31, 2018 and 2017. Non-interest income 2018 2017 Service charges and fees $ 7,250 $ 5,319 Debit card income 6,178 4,547 Mortgage banking (a) 1,298 1,955 Increase in bank-owned life insurance (a) 2,199 1,445 Net gain (loss) from securities transactions (a) (9 ) 271 Other (b) 2,809 1,903 Total non-interest income $ 19,725 $ 15,440 (a) (b) A description of the Company’s revenue streams accounted for under ASC 606 are as follows: Service Charges and Fees: The Company earns fees from its deposit customers for transaction-based, account maintenance and overdraft services. Transaction-based fees, which include services such as stop payment charges, statement rendering and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Company fulfills the customer’s request. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which the Company satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are collected through withdrawal from the customer’s account balance. Debit Card Income: The Company earns debit card income from cardholder transactions conducted through payment processors. Debit card income from cardholder transactions represent a percentage of the underlying transaction value and are recognized concurrently with the transaction processing services provided to the cardholder. Investment Referral Income: Investment referral services are offered through an unaffiliated registered broker-dealer and investment advisor. Investment referral income consists of transaction-based fees (i.e. trade commissions) and account fees (i.e. custodial fees). The service obligation for transaction-based fees relates to processing of individual transactions and is considered earned at the time the transaction occurs. The Company currently records this income when payment is received and at each month end for current-month transactions. Account fees are considered earned over the period for which the fees relate. These fees are received during the first month of each quarter and represent advance payment for the current quarter. These fees are amortized ratably over the three months during the quarter. Therefore, all account-based fees are currently recorded as performance obligations are satisfied. Insurance Sales Commissions: Insurance commissions are received based on contracts with insurance companies which provide for a percentage of premiums to be paid to the Company in exchange for placement of policies with customers. The commissions generally relate to a period of one year or less. Under certain contracts, the Company may also assist with claims processing, but this performance obligation is considered insignificant compared to the initial placement of the policy. As such, the performance obligation is considered to have been substantially satisfied at the time of policy placement. While this indicates that all related revenue would be appropriately accrued at policy inception, in some cases recognition occurs over the policy period if received in installments from the insurance company. In no cases would this deferral extend beyond 12 months and the effect is considered immaterial compared to recognition at the time of policy placement. The Company also receives commission based on renewals of policies previously placed. However, additional work is required to process the renewals, resulting in future performance obligations to earn the related revenues. In addition, the occurrence of such renewals is not certain as initial policies are generally for one year or less and the fees earned are not determined until the time of renewal, based on underwriting at that time. As such, the Company has determined that accrual of income, for future renewals, is not appropriate. Other Non-interest Income: Other non-interest income related to loans and deposits is earned when the specific transaction is processed, similar to service charges and fees. Gain or Loss on Sale of Other Real Estate: Gain or loss on sale of other real estate is reported in non-interest expense and is netted with other real estate expenses. The Company records a gain or loss from the sale of other real estate when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Company finances the sale of other real estate to the buyer, the Company assesses whether the buyer is committed to perform their obligation under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the other real estate is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Company adjusts the transaction price and related gain or loss on sale if a significant financing component is present. As a result, the Company has concluded that ASC 606 will affect the decision to recognize or defer gains on sales of other real estate in circumstances where the Company has financed the sale. Reclassifications Recent Accounting Pronouncements: In February 2016, FASB issued ASU 2016-02, Leases, Leases – Targeted In June 2016, FASB issued ASU 2016-13, Financial Instruments – Credit Losses, In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other In March 2017, FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities. In August 2017, FASB issued ASU 2017-12, Derivatives and Hedging, Targeted Improvements to Accounting for Hedging Activities In August 2018, FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
BUSINESS COMBINATIONS	On August 23, 2018, the Company acquired City Bank and Trust Company (“City Bank”), which had one branch location in Guymon, Oklahoma, from Docking Bancshares, Inc. Results of operations of City Bank were included in the Company’s results of operations beginning August 24, 2018. Acquisition-related costs associated with this merger were $1,387 The fair value of consideration exchanged exceeded the recognized amounts of the identifiable net assets and resulted in goodwill of $5,824 Fair value of consideration: Cash $ 18,900 $ 18,900 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 27,659 Held-to-maturity securities 44,927 Federal Reserve Bank and Federal Home Loan Bank stock 881 Loans 77,148 Premises and equipment 2,044 Core deposit intangibles 3,360 Other real estate owned 307 Other assets 1,103 Total assets acquired 157,429 Deposits 126,853 Federal Home Loan Bank advances 17,353 Interest payable and other liabilities 147 Total liabilities assumed 144,353 Total identifiable net assets 13,076 Goodwill 5,824 $ 18,900 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered purchased credit impaired as of the merger date. The fair value adjustments were determined using discounted contractual cash flows. However, the Company believes that all contractual cash flows related to these financial instruments will be collected. As such, these loans were not considered impaired at the merger date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Cash flows associated with purchased credit impaired loans are not considered reasonably predictable and as such these loans are considered nonaccrual. The following table presents the best available information about the loans acquired in the City Bank merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 74,918 $ 5,136 Non-accretable difference (expected losses) — (1,156 ) Cash flows expected to be collected 74,918 3,980 Accretable yield (1,750 ) — Fair value of acquired loans $ 73,168 $ 3,980 The following table presents the carrying value of the loans acquired in the City Bank merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 17,398 $ 2,592 $ 19,990 Commercial and industrial 8,463 158 8,621 Residential real estate 26,716 798 27,514 Agricultural real estate 5,571 — 5,571 Consumer 8,905 244 9,149 Agricultural 6,115 188 6,303 Fair value of acquired loans $ 73,168 $ 3,980 $ 77,148 On May 4, 2018, the Company acquired 100% of the outstanding common shares of Kansas Bank Corporation (“KBC”), based in Liberal, Kansas. Results of operations of KBC were included in the Company’s results of operations beginning May 5, 2018. Acquisition-related costs associated with this merger were $4,360 The fair value of consideration exchanged exceeded the recognized amounts of the identifiable net assets and resulted in goodwill of $14,010 Fair value of consideration: Common Stock $ 32,103 Cash 14,918 $ 47,021 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 27,899 Available-for-sale securities 22,820 Held-to-maturity securities 92,028 Federal Reserve Bank and Federal Home Loan Bank stock 475 Loans 159,359 Premises and equipment 5,835 Core deposit intangibles 8,080 Other assets 5,618 Total assets acquired 322,114 Deposits 288,352 Interest payable and other liabilities 751 Total liabilities assumed 289,103 Total identifiable net assets 33,011 Goodwill 14,010 $ 47,021 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered purchased credit impaired as of the merger date. The fair value adjustments were determined using discounted contractual cash flows. However, the Company believes that all contractual cash flows related to these financial instruments will be collected. As such, these loans were not considered impaired at the merger date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Cash flows associated with purchased credit impaired loans are not considered reasonably predictable and as such these loans are considered nonaccrual. The following table presents the best available information about the loans acquired in the KBC merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 160,526 $ 5,066 Non-accretable difference (expected losses) — (2,305 ) Cash flows expected to be collected 160,526 2,761 Accretable yield (3,928 ) — Fair value of acquired loans $ 156,598 $ 2,761 The following table presents the carrying value of the loans acquired in the KBC merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 94,492 $ 1,975 $ 96,467 Commercial and industrial 18,848 622 19,470 Residential real estate 2,898 — 2,898 Agricultural real estate 22,425 — 22,425 Consumer 3,539 — 3,539 Agricultural 14,396 164 14,560 Fair value of acquired loans $ 156,598 $ 2,761 $ 159,359 Also on May 4, 2018, the Company acquired 100% of the outstanding common shares of Adams Dairy Bancshares, Inc. (“Adams”), based in Blue Springs, Missouri. Results of operations of Adams were included in the Company’s results of operations beginning May 5, 2018. Acquisition-related costs associated with this merger were $1,217 The fair value of consideration exchanged exceeded the recognized amounts of the identifiable net assets and resulted in goodwill of $8,465 Fair value of consideration: Common stock $ 13,456 Cash 3,960 $ 17,416 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 2,812 Interest bearing time deposits in other banks 4,237 Available-for-sale securities 10,677 Held-to-maturity securities 335 Federal Reserve Bank and Federal Home Loan Bank stock 194 Loans 82,716 Premises and equipment 4,485 Bank-owned life insurance 2,869 Core deposit intangibles 1,990 Other assets 1,042 Total assets acquired 111,357 Deposits 97,124 Federal Home Loan Bank advances 1,000 Interest payable and other liabilities 4,282 Total liabilities assumed 102,406 Total identifiable net assets 8,951 Goodwill 8,465 $ 17,416 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered purchased credit impaired as of the merger date. The fair value adjustments were determined using discounted contractual cash flows. However, the Company believes that all contractual cash flows related to these financial instruments will be collected. As such, these loans were not considered impaired at the merger date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Cash flows associated with purchased credit impaired loans are not considered reasonably predictable and as such these loans are considered nonaccrual. The following table presents the best available information about the loans acquired in the Adams merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 84,225 $ 1,477 Non-accretable difference (expected losses) — (238 ) Cash flows expected to be collected 84,225 1,239 Accretable yield (2,748 ) — Fair value of acquired loans $ 81,477 $ 1,239 The following table presents the carrying value of the loans acquired in the Adams merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 74,657 $ 820 $ 75,477 Commercial and industrial 1,002 419 1,421 Residential real estate 4,955 — 4,955 Consumer 863 — 863 Fair value of acquired loans $ 81,477 $ 1,239 $ 82,716 Assuming that the City Bank, KBC and Adams mergers would have taken place on January 1, 2017, total combined revenue would have been $203,860 for year ended December 31, 2018 and $147,222 for year ended December 31, 2017. Net income would have been $49,801 and $27,108 at December 31, 2018 and 2017. The pro forma amounts disclosed exclude merger expense from non-interest expense, which is considered a material non-recurring adjustment. Separate revenue and earnings of the former City Bank, KBC and Adams are not available subsequent to the business combinations. On November 10, 2017, the Company acquired 100% of the outstanding common shares of Eastman National Bancshares, Inc., based in Newkirk, Oklahoma (“Eastman”). Results of operations of Eastman were included in the Company’s results of operations beginning November 11, 2017. Acquisition-related costs associated with this merger are included in merger expenses in the Company’s income statement and were $146 The fair value of consideration exchanged exceeded the recognized amounts of the identifiable net assets and resulted in goodwill of $20,743 Fair value of consideration: Common stock $ 39,109 Cash 8,096 $ 47,205 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 14,698 Available-for-sale securities 59,778 Federal Reserve Bank and Federal Home Loan Bank stock 434 Loans 177,880 Premises and equipment 1,903 Core deposit intangible 4,020 Other real estate owned 41 Interest receivable 998 Other assets 1,047 Total assets acquired 260,799 Deposits 224,111 Federal funds purchased and retail repurchase agreements 8,678 Interest payable and other liabilities 1,548 Total liabilities assumed 234,337 Total identifiable net assets 26,462 Goodwill 20,743 $ 47,205 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered purchased credit impaired as of the acquisition date. The fair value adjustments were determined using discounted contractual cash flows. However, the Company believes that all contractual cash flows related to these financial instruments will be collected. As such, these loans were not considered impaired at the merger date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Cash flows associated with purchased credit impaired loans are not considered reasonably predictable and as such these loans are considered nonaccrual. The following table presents the best available information about the loans acquired in the Eastman merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 171,788 $ 12,849 Non-accretable difference (expected losses) — (4,077 ) Cash flows expected to be collected 171,788 8,772 Accretable yield (2,680 ) — Fair value of acquired loans $ 169,108 $ 8,772 The following table presents the carrying value of the loans acquired in the Eastman merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 71,917 $ 5,326 $ 77,243 Commercial and industrial 36,645 1,545 38,190 Residential real estate 36,846 458 37,304 Agricultural real estate 7,080 33 7,113 Consumer 5,158 — 5,158 Agricultural 11,462 1,410 12,872 Fair value of acquired loans $ 169,108 $ 8,772 $ 177,880 Also on November 10, 2017, the Company acquired 100% of the outstanding common shares of Cache Holdings, Inc. (“Cache”), based in Tulsa, Oklahoma. Results of operations of Cache were included in the Company’s results of operations beginning November 11, 2017. Acquisition-related costs associated with this merger are included in merger expenses in the Company’s income statement and were $166 The fair value of consideration exchanged exceeded the recognized amounts of the identifiable net assets and resulted in goodwill of $18,083 Fair value of consideration: Common stock $ 39,480 Cash 12,877 $ 52,357 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 10,273 Federal Reserve Bank and Federal Home Loan Bank stock 2,053 Loans held for investment 300,715 Premises and equipment 4,235 Core deposit intangible 1,580 Bank-owned life insurance 3,883 Interest receivable 778 Other assets 1,813 Total assets acquired 325,330 Deposits 278,706 Federal Home Loan Bank advances 9,402 Bank stock loan 1,000 Interest payable and other liabilities 1,948 Total liabilities assumed 291,056 Total identifiable net assets 34,274 Goodwill 18,083 $ 52,357 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered purchased credit impaired as of the acquisition date. The fair value adjustments were determined using discounted contractual cash flows. However, the Company believes that all contractual cash flows related to these financial instruments will be collected. As such, these loans were not considered impaired at the acquisition date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Cash flows associated with purchased credit impaired loans are not considered reasonably predictable and as such these loans are considered nonaccrual. The following table presents the best available information about the loans acquired in the Cache merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 302,460 $ 2,035 Non-accretable difference (expected losses) — (371 ) Cash flows expected to be collected 302,460 1,664 Accretable yield (3,017 ) (392 ) Fair value of acquired loans $ 299,443 $ 1,272 The following table presents the carrying value of the loans acquired in the Cache merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 199,151 $ 918 $ 200,069 Commercial and industrial 96,682 354 97,036 Residential real estate 2,027 — 2,027 Agricultural real estate 265 — 265 Consumer 1,318 — 1,318 Fair value of acquired loans $ 299,443 $ 1,272 $ 300,715 On March 10, 2017, the Company acquired 100% of the outstanding common shares of Prairie State Bancshares, Inc., based in Hoxie, Kansas (“Prairie”). Results of operations of Prairie were included in the Company’s results of operations beginning March 11, 2017. Acquisition-related costs associated with this merger were $926 ($576 on an after-tax basis) and are included in merger expenses in the Company’s income statement for the year ended December 31, 2017. The fair value of consideration exchanged exceeded the recognized amounts of the identifiable net assets and resulted in goodwill of $5,713. Goodwill resulted from a combination of expected synergies, expansion in western Kansas with the addition of three branch locations, growth opportunities and increases in stock prices after the stock exchange ratios were negotiated. The following table summarizes the consideration paid for Prairie and the amounts of the assets acquired and liabilities assumed recognized at the acquisition date. Fair value of consideration: Common stock $ 15,242 Cash 12,255 $ 27,497 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 6,579 Available-for-sale securities 3,427 Held-to-maturity securities 971 Federal Reserve Bank and Federal Home Loan Bank stock 198 Loans 129,997 Premises and equipment 2,424 Core deposit intangible 1,448 Other assets 2,331 Total assets acquired 147,375 Deposits 125,353 Interest payable and other liabilities 238 Total liabilities assumed 125,591 Total identifiable net assets 21,784 Goodwill 5,713 $ 27,497 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered purchased credit impaired as of the acquisition date. The fair value adjustments were determined using discounted contractual cash flows. However, the Company believes that all contractual cash flows related to these financial instruments will be collected. As such, these loans were not considered impaired at the acquisition date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Cash flows associated with purchased credit impaired loans are not considered reasonably predictable and as such these loans are considered nonaccrual. The following table presents the best available information about the loans acquired in the Prairie merger as of the date of merger. Non-Credit Impaired Purchased Impaired Contractually required principal $ 123,519 $ 11,430 Non-accretable difference (expected losses) — (2,673 ) Cash flows expected to be collected 123,519 8,757 Accretable yield (2,279 ) — Fair value of acquired loans $ 121,240 $ 8,757 The following table presents the carrying value of the loans acquired in the Prairie merger by class, as of the date of merger. Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 9,224 $ 144 $ 9,368 Commercial and industrial 11,203 974 12,177 Residential real estate 137 — 137 Agricultural real estate 25,593 2,960 28,553 Consumer 1,451 — 1,451 Agricultural 73,632 4,679 78,311 Fair value of acquired loans $ 121,240 $ 8,757 $ 129,997 Assuming that the Prairie, Eastman and Cache mergers would have taken place on January 1, 2016, total combined revenue would have been $141,843 for year ended December 31, 2017 and $106,969 for year ended December 31, 2016. Net income would have been $32,539 and $24,480 at December 31, 2017 and 2016. The pro forma amounts disclosed exclude merger expense from non-interest expense, which is considered a material non-recurring adjustment. Separate revenue and earnings of the former Prairie, Eastman and Cache are not available subsequent to the business combinations.

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
SECURITIES	NOTE 3 – SECURITIES The amortized cost and fair value of available-for-sale securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income were as follows Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2018 Available-for-sale securities Residential mortgage-backed securities (issued by government-sponsored entities) $ 173,503 $ 12 $ (4,640 ) $ 168,875 $ 173,503 $ 12 $ (4,640 ) $ 168,875 December 31, 2017 Available-for-sale securities Residential mortgage-backed securities (issued by government-sponsored entities) $ 163,374 $ 36 $ (1,819 ) $ 161,591 State and political subdivisions 195 — — 195 Equity securities 500 — (14 ) 486 $ 164,069 $ 36 $ (1,833 ) $ 162,272 The amortized cost and fair value of held-to-maturity securities and the related gross unrecognized gains and losses were as follows Amortized Cost Gross Unrecognized Gains Gross Unrecognized Losses Fair Value December 31, 2018 Held-to-maturity securities U.S. Government-sponsored entities $ 3,873 $ 7 $ (20 ) $ 3,860 Residential mortgage-backed securities (issued by government sponsored entities) 567,766 2,354 (9,653 ) 560,467 Corporate 22,993 234 (326 ) 22,901 Small Business Administration loan pools 1,746 — (18 ) 1,728 State and political subdivisions 151,978 804 (1,749 ) 151,033 $ 748,356 $ 3,399 $ (11,766 ) $ 739,989 December 31, 2017 Held-to-maturity securities U.S. Government-sponsored entities $ 998 $ — $ (13 ) $ 985 Residential mortgage-backed securities (issued by government sponsored entities) 383,875 573 (4,866 ) 379,582 Corporate 22,991 355 — 23,346 Small Business Administration loan pools 2,048 — (14 ) 2,034 State and political subdivisions 125,550 1,694 (447 ) 126,797 $ 535,462 $ 2,622 $ (5,340 ) $ 532,744 The tables above present unrecognized losses on held-to-maturity securities since date of designation. The fair value and amortized cost of debt securities at December 31, 2018, by contractual maturity, is shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value Within one year $ — $ — $ 6,425 $ 6,474 One to five years — — 36,413 36,586 Five to ten years — — 54,205 54,275 After ten years — — 83,547 82,187 Mortgage-backed securities 173,503 168,875 567,766 560,467 Total debt securities $ 173,503 $ 168,875 $ 748,356 $ 739,989 The carrying value of securities pledged as collateral, to secure public deposits and for other purposes, was approximately $800,744 The following tables show gross unrealized losses and fair value aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2018 and 2017 Less Than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss December 31, 2018 Available-for-sale securities Residential mortgage-backed (issued by government-sponsored entities) $ 48,332 $ (575 ) $ 115,844 $ (4,065 ) $ 164,176 $ (4,640 ) Total temporarily impaired securities $ 48,332 $ (575 ) $ 115,844 $ (4,065 ) $ 164,176 $ (4,640 ) December 31, 2017 Available-for-sale securities Residential mortgage-backed (issued by government-sponsored entities) $ 78,884 $ (437 ) $ 58,540 $ (1,382 ) $ 137,424 $ (1,819 ) Equity securities — — 486 (14 ) 486 (14 ) Total temporarily impaired securities $ 78,884 $ (437 ) $ 59,026 $ (1,396 ) $ 137,910 $ (1,833 ) Less Than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss December 31, 2018 Held-to-maturity securities U.S. Government-sponsored entities $ 1,882 $ (3 ) $ 982 $ (17 ) $ 2,864 $ (20 ) Residential mortgage-backed (issued by government-sponsored entities) 31,270 (356 ) 294,127 (10,579 ) 325,397 (10,935 ) Corporate 7,500 (326 ) 5,182 (49 ) 12,682 (375 ) Small Business Administration loan pools — — 1,728 (37 ) 1,728 (37 ) State and political subdivisions 40,415 (473 ) 45,137 (1,561 ) 85,552 (2,034 ) Total temporarily impaired securities $ 81,067 $ (1,158 ) $ 347,156 $ (12,243 ) $ 428,223 $ (13,401 ) December 31, 2017 Held-to-maturity securities U.S. Government-sponsored entities $ — $ — $ 985 $ (13 ) $ 985 $ (13 ) Residential mortgage-backed (issued by government-sponsored entities) 147,281 (1,263 ) 198,239 (5,030 ) 345,520 (6,293 ) Corporate 5,312 (16 ) — — 5,312 (16 ) Small Business Administration loan pools 926 (1 ) 1,108 (38 ) 2,034 (39 ) State and political subdivisions 22,100 (123 ) 26,387 (439 ) 48,487 (562 ) Total temporarily impaired securities $ 175,619 $ (1,403 ) $ 226,719 $ (5,520 ) $ 402,338 $ (6,923 ) As of December 31, 2018, the Company held 36 Unrealized losses on securities have not been recognized into income because the security issuers are of high credit quality, management does not intend to sell and it is more likely than not that the Company will not be required to sell the securities prior to their anticipated recovery, and the decline in fair value is largely due to changes in interest rates. The fair value is expected to recover as the securities approach maturity. The proceeds from sales and the associated gains and losses on available-for-sale securities reclassified from other comprehensive income to income are listed below. 2018 2017 2016 Proceeds $ — $ 84,087 $ 70,957 Gross gains — 271 893 Gross losses — — — Income tax expense on net realized gains — 103 342 Included in net gains on sales of and settlement of securities in the Company’s consolidated statement of income for 2016 the Company recorded an other-than-temporary impairment loss in the amount of $414. The impairment loss reflects the difference between the amortized cost of the Company’s investment in AgriBank 9.125% subordinated notes, due July 2019 and the fair value attributable to AgriBank’s redemption call of those notes.

LOANS AND ALLOWANCE FOR LOAN LO

LOANS AND ALLOWANCE FOR LOAN LOSSES	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Loans and Allowance for Loan Losses	NOTE 4 – LOANS AND ALLOWANCE FOR LOAN LOSSES The following table lists categories of loans at December 31, 2018 and 2017 2018 2017 Commercial real estate $ 1,251,992 $ 987,661 Commercial and industrial 582,527 521,510 Residential real estate 444,540 376,705 Agricultural real estate 139,332 86,486 Consumer 62,894 49,361 Agricultural 94,123 95,547 Total loans 2,575,408 2,117,270 Allowance for loan losses (11,454 ) (8,498 ) Net loans $ 2,563,954 $ 2,108,772 During 2017 the Company purchased one pool of residential real estate loans totaling $14,767. As of December 31, 2018 and 2017, residential real estate loans include $64,558 Overdraft deposit accounts are reclassified and included in consumer loans above. These accounts totaled $1,279 The following tables present the activity in the allowance for loan losses by class for the years ended December 31, 2018, 2017 and 2016 December 31, 2018 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Beginning balance $ 2,740 $ 2,136 $ 2,262 $ 319 $ 768 $ 273 $ 8,498 Provision for loan losses 1,832 636 97 146 1,188 62 3,961 Loans charged-off (1,779 ) (118 ) (293 ) (93 ) (1,431 ) (43 ) (3,757 ) Recoveries 1,869 53 254 19 545 12 2,752 Total ending allowance balance $ 4,662 $ 2,707 $ 2,320 $ 391 $ 1,070 $ 304 $ 11,454 December 31, 2017 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Beginning balance $ 2,420 $ 1,881 $ 1,765 $ 35 $ 266 $ 65 $ 6,432 Provision for loan losses (69 ) 651 604 287 1,236 244 2,953 Loans charged-off (271 ) (431 ) (350 ) (16 ) (1,025 ) (42 ) (2,135 ) Recoveries 660 35 243 13 291 6 1,248 Total ending allowance balance $ 2,740 $ 2,136 $ 2,262 $ 319 $ 768 $ 273 $ 8,498 December 31, 2016 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Beginning balance $ 2,051 $ 1,366 $ 1,824 $ 29 $ 187 $ 49 $ 5,506 Provision for loan losses 725 700 75 6 567 46 2,119 Loans charged-off (557 ) (226 ) (299 ) (23 ) (584 ) (31 ) (1,720 ) Recoveries 201 41 165 23 96 1 527 Total ending allowance balance $ 2,420 $ 1,881 $ 1,765 $ 35 $ 266 $ 65 $ 6,432 The following tables present the recorded investment in loans and the balance in the allowance for loan losses by portfolio and class based on impairment method as of December 31, 2018 and 2017 December 31, 2018 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Individually evaluated for impairment $ 242 $ 185 $ 391 $ 22 $ 62 $ 10 $ 912 Collectively evaluated for impairment 3,695 2,493 1,861 367 925 293 9,634 Purchased credit impaired loans 725 29 68 2 83 1 908 Total $ 4,662 $ 2,707 $ 2,320 $ 391 $ 1,070 $ 304 $ 11,454 Loan Balance: Individually evaluated for impairment $ 23,323 $ 5,020 $ 4,434 $ 856 $ 678 $ 2,252 $ 36,563 Collectively evaluated for impairment 1,215,173 571,171 437,219 133,415 61,978 89,194 2,508,150 Purchased credit impaired loans 13,496 6,336 2,887 5,061 238 2,677 30,695 Total $ 1,251,992 $ 582,527 $ 444,540 $ 139,332 $ 62,894 $ 94,123 $ 2,575,408 December 31, 2017 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Individually evaluated for impairment $ 130 $ 87 $ 386 $ 46 $ 56 $ 36 $ 741 Collectively evaluated for impairment 2,582 2,028 1,815 190 712 236 7,563 Purchased credit impaired loans 28 21 61 83 — 1 194 Total $ 2,740 $ 2,136 $ 2,262 $ 319 $ 768 $ 273 $ 8,498 Loan Balance: Individually evaluated for impairment $ 2,728 $ 7,886 $ 4,829 $ 533 $ 556 $ 1,050 $ 17,582 Collectively evaluated for impairment 971,376 507,894 369,471 82,493 48,802 90,795 2,070,831 Purchased credit impaired loans 13,557 5,730 2,405 3,460 3 3,702 28,857 Total $ 987,661 $ 521,510 $ 376,705 $ 86,486 $ 49,361 $ 95,547 $ 2,117,270 Excluding purchased credit impaired loans, included in the above tables is $827,676 The following table presents information related to impaired loans, excluding those purchased credit impaired loans which have not deteriorated since acquisition, by class of loans as of and for the year ended December 31, 2018 December 31, 2018 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial real estate $ 20,940 $ 20,902 $ — $ 5,652 $ 150 Commercial and industrial 3,446 3,396 — 5,629 66 Residential real estate 533 527 — 744 20 Agricultural real estate 2,038 2,035 — 1,364 18 Consumer 61 55 — 32 2 Agricultural 756 756 — 411 18 Subtotal 27,774 27,671 — 13,832 274 With an allowance recorded: Commercial real estate 8,700 7,179 967 2,913 142 Commercial and industrial 2,255 1,911 214 1,068 53 Residential real estate 4,934 4,582 459 4,188 74 Agricultural real estate 261 242 24 429 2 Consumer 1,144 859 145 568 33 Agricultural 162 106 11 418 4 Subtotal 17,456 14,879 1,820 9,584 308 Total $ 45,230 $ 42,550 $ 1,820 $ 23,416 $ 582 The above table presents interest income for the twelve months ended December 31, 2018. Interest income recognized in the above table was substantially recognized on the cash basis. The recorded investment in loans excludes accrued interest receivable due to immateriality. The following table presents information related to impaired loans, excluding purchased credit impaired loans which have not deteriorated since acquisition, by portfolio and class of loans as of and for the year ended December 31, 2017. December 31, 2017 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial real estate $ 1,878 $ 1,567 $ — $ 1,426 $ 267 Commercial and industrial 8,679 8,020 — 4,572 252 Residential real estate 1,230 969 — 587 29 Agricultural real estate 52 52 — 270 12 Consumer 1 — — — 1 Agricultural 7 7 — 83 73 Subtotal 11,847 10,615 — 6,938 634 With an allowance recorded: Commercial real estate 4,049 1,597 158 1,813 16 Commercial and industrial 1,310 1,113 108 663 51 Residential real estate 4,868 4,468 447 3,916 95 Agricultural real estate 1,266 1,034 129 527 16 Consumer 677 559 56 448 15 Agricultural 1,798 1,444 37 469 2 Subtotal 13,968 10,215 935 7,836 195 Total $ 25,815 $ 20,830 $ 935 $ 14,774 $ 829 The above table presents interest income for the twelve months ended December 31, 2017. Interest income recognized in the above table was substantially recognized on the cash basis. The recorded investment in loans excludes accrued interest receivable due to immateriality. The following tables present the aging of the recorded investment in past due loans as of December 31, 2018 and 2017, by portfolio and class of loans December 31, 2018 30 – 59 Days Past Due 60 – 89 Days Past Due Greater 90 Days Past Due Still On Accrual Nonaccrual Loans Not Past Due Total Commercial real estate $ 1,302 $ 259 $ — $ 12,768 $ 1,237,663 $ 1,251,992 Commercial and industrial 509 2,467 — 6,954 572,597 582,527 Residential real estate 782 2,188 18 5,257 436,295 444,540 Agricultural real estate — 30 — 4,857 134,445 139,332 Consumer 501 157 — 914 61,322 62,894 Agricultural 186 3 — 2,453 91,481 94,123 Total $ 3,280 $ 5,104 $ 18 $ 33,203 $ 2,533,803 $ 2,575,408 December 31, 2017 30 – 59 Days Past Due 60 – 89 Days Past Due Greater 90 Days Past Due Still On Accrual Nonaccrual Loans Not Past Due Total Commercial real estate $ 1,284 $ 22 $ — $ 11,607 $ 974,748 $ 987,661 Commercial and industrial 251 6 — 13,217 508,036 521,510 Residential real estate 1,457 1,176 — 6,148 367,924 376,705 Agricultural real estate 123 — — 3,993 82,370 86,486 Consumer 359 112 — 559 48,331 49,361 Agricultural 415 — — 4,752 90,380 95,547 Total $ 3,889 $ 1,316 $ — $ 40,276 $ 2,071,789 2,117,270 Credit Quality Indicators The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. Consumer loans are considered unclassified credits unless downgraded due to payment status or reviewed as part of a larger credit relationship. The Company uses the following definitions for risk ratings: Pass : Loans classified as pass do not have any noted weaknesses and repayment of the loan is expected. These loans are considered unclassified. Special Mention : Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the Company’s credit position at some future date. These loans are considered classified. Substandard : Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. These loans are considered classified. Doubtful : Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. These loans are considered classified. The risk category of loans by class of loans is as follows as of December 31, 2018 and 2017 December 31, 2018 Unclassified Classified Total Commercial real estate $ 1,215,015 $ 36,977 $ 1,251,992 Commercial and industrial 553,045 29,482 582,527 Residential real estate 439,184 5,356 444,540 Agricultural real estate 129,285 10,047 139,332 Consumer 61,976 918 62,894 Agricultural 90,848 3,275 94,123 Total $ 2,489,353 $ 86,055 2,575,408 December 31, 2017 Unclassified Classified Total Commercial real estate $ 971,458 $ 16,203 $ 987,661 Commercial and industrial 500,141 21,369 521,510 Residential real estate 370,151 6,554 376,705 Agricultural real estate 77,084 9,402 86,486 Consumer 48,777 584 49,361 Agricultural 88,261 7,286 95,547 Total $ 2,055,872 $ 61,398 2,117,270 Purchased Credit Impaired Loans The Company has acquired loans, for which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The recorded investments in purchased credit impaired loans as of December 31, 2018, 2017 and 2016 were as follows 2018 2017 2016 Contractually required principal payments $ 40,772 $ 41,349 $ 27,413 Discount (10,077 ) (12,492 ) (8,914 ) Recorded investment $ 30,695 $ 28,857 $ 18,499 The accretable yield associated with these loans was $3,785 Troubled Debt Restructurings The company had no material loans modified under troubled debt restructurings as of December 31, 2018 and 2017.

OTHER REAL ESTATE OWNED

OTHER REAL ESTATE OWNED	12 Months Ended
	Dec. 31, 2018
Banking And Thrift [Abstract]
OTHER REAL ESTATE OWNED	NOTE 5 – OTHER REAL ESTATE OWNED Changes in other real estate owned for the years ended December 31, 2018 and 2017 were as follows. 2018 2017 Beginning of year $ 7,907 $ 8,656 Transfers in 3,228 4,562 Acquired in acquisition 307 41 Net (loss) gain on sales (75 ) 121 Proceeds from sales (4,730 ) (5,461 ) 6,637 7,919 Additions to valuation reserve (265 ) (12 ) Recorded investment $ 6,372 $ 7,907 Expenses related to other real estate owned for the years ended December 31, 2018, 2017 and 2016 were as follows. 2018 2017 2016 Net loss (gain) on sales $ 75 $ (121 ) $ (156 ) Gain on initial valuation of other real estate properties received (920 ) — — Provision for unrealized losses 265 12 44 Operating expenses, net of rental income 509 632 498 $ (71 ) $ 523 $ 386 The balance of real estate owned includes $720 of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property at December 31, 2018 and $704 at December 31, 2017. The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $2,064 at December 31, 2018 and $2,186 at December 31, 2017.

PREMISES AND EQUIPMENT

PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2018
Property Plant And Equipment [Abstract]
PREMISES AND EQUIPMENT	NOTE 6 – PREMISES AND EQUIPMENT Major classifications of premises and equipment, stated at cost, are as follows. 2018 2017 Land $ 16,988 $ 13,842 Buildings and improvements 62,116 51,703 Furniture, fixtures and equipment 17,217 11,620 96,321 77,165 Less: accumulated depreciation (15,879 ) (13,716 ) Premises and equipment, net $ 80,442 $ 63,449 Operating Leases The Company leases certain branch properties under operating leases. Rent expense was $695, $691 and $554 for 2018, 2017 and 2016. Rent commitments at December 31, 2018, before considering renewal options that generally are present, were as follows. Due in one year or less $ 655 Due after one year through two years 585 Due after two years through three years 362 Due after three years through four years 352 Due after four years through five years 303 Thereafter 1,911 Total $ 4,168

GOODWILL AND CORE DEPOSIT INTAN

GOODWILL AND CORE DEPOSIT INTANGIBLES	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
GOODWILL AND CORE DEPOSIT INTANGIBLES	NOTE 7 – GOODWILL AND CORE DEPOSIT INTANGIBLES The assets and liabilities acquired in business combinations are recorded at their estimated fair values at the acquisition date. The excess of the purchase price over the estimated fair value of the net assets for tax free acquisitions is recorded as goodwill, none of which is deductible for tax purposes. The excess of the purchase price over the estimated fair value of the net assets for taxable acquisitions is recorded as goodwill and is deductible for tax purposes. The carrying basis of goodwill and core deposit intangibles as of and for the years ended December 31, 2018 and 2017 were as follows. Goodwill Core Deposit Balance as of January 1, 2017 $ 58,874 $ 4,715 Acquired in acquisition 46,033 7,048 Amortization — (1,025 ) Balance as of December 31, 2017 104,907 10,738 Acquired in acquisition 26,805 13,430 Amortization — (2,443 ) Balance as of December 31, 2018 $ 131,712 $ 21,725 Estimated amortization expense for each of the following five years and thereafter is listed in the following table. Expensed in one year or less $ 2,949 Expensed after one year through two years 2,822 Expensed after two years through three years 2,759 Expensed after three years through four years 2,696 Expensed after four years through five years 2,637 Thereafter 7,862 Total $ 21,725

QUALIFIED AFFORDABLE HOUSING PR

QUALIFIED AFFORDABLE HOUSING PROJECT INVESTMENTS	12 Months Ended
	Dec. 31, 2018
Investments In Affordable Housing Projects [Abstract]
QUALIFIED AFFORDABLE HOUSING PROJECT INVESTMENTS	NOTE 8 – QUALIFIED AFFORDABLE HOUSING PROJECT INVESTMENTS The Company invests in qualified affordable housing projects. At December 31, 2018, 2017 and 2016, the balances of the investments in qualified affordable housing projects were $6,689, $4,604 and $4,983. These balances are reflected in the other assets line in the consolidated balance sheets. Total unfunded commitments related to the investments in qualified affordable housing projects totaled $3,965, $1,967 and $2,504 at December 31, 2018, 2017 and 2016. The Company expects to fulfill these commitments during the years 2019 through 2033. During the years ended December 31, 2018, 2017 and 2016, the Company recognized amortization expense of $412, $376 and $296, which was included within pretax income on the consolidated statements of income. Additionally, during the years ended December 31, 2018, 2017 and 2016, the Company recognized tax credits from its investment in affordable housing tax credits of $568, $657 and $625.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	NOTE 9 – DERIVATIVE FINANCIAL INSTRUMENTS Interest Rate Swaps Designated as Fair Value Hedges The Company periodically enters into interest rate swaps to hedge the fair value of certain commercial real estate loans. These transactions are designated as fair value hedges. In this type of transaction, the Company typically receives from the counterparty a variable-rate cash flow based on the one-month London Interbank Offered Rate (LIBOR) plus a spread to this index and pays a fixed-rate cash flow equal to the customer loan rate. At December 31, 2018, the portfolio of interest rate swaps had a weighted average maturity of 7.7 years Stand-Alone Derivatives The Company periodically enters into interest rate swaps with out borrowers and simultaneously enters into swaps with a counterparty with offsetting terms for the purpose of providing our borrowers long-term fixed rate loans. Neither swap is designated as a hedge and both are marked to market through earnings. At December 31, 2018, this portfolio of interest rate swaps had a weighted average maturity of 7.6 In 2009, the Company purchased an interest rate cap derivative to assist with interest rate risk management. This derivative is not designated as a hedging instrument but rather as a stand-alone derivative. At December 31, 2018, the interest rate cap had a term of 0.9 Reconciliation of Derivative Fair Values and Gains/(Losses) The notional amount of a derivative contract is a factor in determining periodic interest payments or cash flows received or paid. The notional amount of derivatives serves as a level of involvement in various types of derivatives. The notional amount does not represent the Company’s overall exposure to credit or market risk, generally, the exposure is significantly smaller. The following table shows the notional balances and fair values (including net accrued interest) of the derivatives outstanding by derivative type at December 31, 2018 and December 31, 2017 December 31, 2018 December 31, 2017 Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate swaps $ 16,743 $ 242 $ — $ 17,231 $ — $ 46 Total derivatives designated as hedging relationships 16,743 242 — 17,231 — 46 Derivatives not designated as hedging instruments: Interest rate swaps 38,073 690 777 — — — Interest rate caps/floors 2,264 1 — 2,574 1 — Total derivatives not designated as hedging instruments 40,337 691 777 2,574 1 — Total $ 57,080 933 777 $ 19,805 1 46 Cash collateral (531 ) (541 ) — (210 ) Netting adjustments 289 289 164 164 Net amount presented in balance sheet $ 691 $ 525 $ 165 $ — The following table shows net gains or losses on derivatives and hedging activities for the years ended December 31, 2018, 2017 and 2016 2018 2017 2016 Derivatives designated as hedging instruments: Interest rate swaps $ — $ — $ — Total net gain (loss) related to fair value hedge ineffectiveness — — — Derivatives not designated as hedging instruments: Economic hedges: Interest rate swaps 202 — — Interest rate caps/floors — (1 ) (1 ) Total net gains (losses) related to derivatives not designated as hedging instruments 202 (1 ) (1 ) Net gains (losses) on derivatives and hedging activities $ 202 $ (1 ) $ (1 ) The following table shows the recorded net gains or losses on derivatives and the related hedged items in fair value hedging relationships and the impact of those derivatives on the Company’s net interest income for the years ended December 31, 2018, 2017 and 2016 December 31, 2018 Gain/(Loss) on Derivatives Gain/(Loss) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect of Derivatives on Net Interest Income Commercial real estate loans $ 283 $ (283 ) $ — $ (40 ) Total $ 283 $ (283 ) $ — $ (40 ) December 31, 2017 Gain/(Loss) on Derivatives Gain/(Loss) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect of Derivatives on Net Interest Income Commercial real estate loans $ 12 $ (12 ) $ — $ (137 ) Total $ 12 $ (12 ) $ — $ (137 ) December 31, 2016 Gain/(Loss) on Derivatives Gain/(Loss) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect of Derivatives on Net Interest Income Commercial real estate loans $ 211 $ (211 ) $ — $ (199 ) Total $ 211 $ (211 ) $ — $ (199 )

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2018
Banking And Thrift [Abstract]
DEPOSITS	NOTE 10 – DEPOSITS Time deposits that met or exceeded the FDIC insurance limit of $250 totaled $316,288 and $245,321 as of December 31, 2018 and 2017. At December 31, 2018 and 2017, Certificate of Deposit Account Registry Services (“CDARS”) deposits of $131,107 and $62,988 were included in the Company’s time deposit balance. Of the CDARS deposits at December 31, 2018 and 2017, $20,933 and $22,934 were reciprocal customer funds placed in the CDARS program. CDARS allows Equity Bank to break large deposits into smaller amounts and place them in a network of other CDARS banks to ensure that FDIC insurance coverage is gained on the entire deposit. Reciprocal deposits are not considered brokered deposits as long as the aggregate balance is less than the lesser of 20% of total liabilities or $5 billion and Equity Bank is well capitalized and well rated. All non-reciprocal deposits and reciprocal deposits in excess of regulatory limits are considered brokered deposits. At December 31, 2018, the scheduled maturities of time deposits are as follows. Due in one year or less $ 673,838 Due after one year through two years 209,695 Due after two years through three years 44,784 Due after three years through four years 63,810 Due after four years through five years 14,720 Thereafter 1,059 Total $ 1,007,906

BORROWINGS

BORROWINGS	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
BORROWINGS	NOTE 11 – BORROWINGS Federal funds purchased and retail repurchase agreements Federal funds purchased and retail repurchase agreements included the following at December 31, 2018 and 2017. 2018 2017 Federal funds purchased $ — $ — Retail repurchase agreements $ 50,068 $ 37,492 Securities sold under agreements to repurchase (retail repurchase agreements) consist of obligations of the Company to other parties. The obligations are secured by residential mortgage-backed securities held by the Company with a fair value of $51,701 and $44,768 at December 31, 2018 and December 31, 2017. The agreements are on a day-to-day basis and can be terminated on demand. The following table presents the borrowing usage and interest rate information for federal funds purchased and retail repurchase agreements at and for the years ended December 31, 2018 and 2017. 2018 2017 Average daily balance during the period $ 43,536 $ 25,823 Average interest rate during the period 0.26 % 0.25 % Maximum month-end balance during the period $ 53,815 $ 43,843 Weighted average interest rate at period-end 0.28 % 0.23 % Federal Home Loan Bank advances Federal Home Loan Bank advances as of December 31, 2018 and 2017 were as follows. 2018 2017 Federal Home Loan Bank line of credit advances $ 368,770 $ 347,692 Federal Home Loan Bank fixed rate term advances 16,049 — Total principal outstanding 384,819 347,692 Federal Home Loan Bank fixed rate term advances, fair market value adjustments 79 — Total Federal Home Loan Bank advances $ 384,898 $ 347,692 At December 31, 2018 and 2017, the Company had $368,770 and $347,692 drawn against its line of credit at a weighted average rate of 2.65% and 1.47%. At December 31, 2018 and 2017, the Company had undisbursed advance commitments (letters of credit) with the Federal Home Loan Bank of $31,451 and $5,690. These letters of credit were obtained in lieu of pledging securities to secure public fund deposits that are over the FDIC insurance limit. The advances, Mortgage Partnership Finance credit enhancement obligations and letters of credit were collateralized by certain qualifying loans totaling $951,196 and $478,966 at December 31, 2018 and 2017. Based on this collateral and the Company’s holdings of Federal Home Loan Bank stock, the Company was eligible to borrow an additional $534,627 and $125,271 at December 31, 2018 and 2017. Future principal repayments of the December 31, 2018 outstanding balances are as follows. Due in one year or less $ 371,724 Due after one year through two years 2,988 Due after two years through three years 2,357 Due after three years through four years 2,357 Due after four years through five years 2,357 Thereafter 3,036 Total $ 384,819 Bank stock loan On March 13, 2017, the Company entered into an agreement with an unaffiliated financial institution that provided for a maximum borrowing facility of $30,000, secured by the Company’s stock in Equity Bank. The borrowing facility was renewed on March 12, 2018, amended March 11, 2019 to provide a maximum borrowing facility of $40,000 and matures May 15, 2020. Each draw of funds on the facility will create a separate note that is repayable over a term of five years. Each note will bear interest at a variable interest rate equal to the prime rate published in the “Money Rates” section of The Wall Street Journal Bank stock loan advances as of December 31, 2018 and 2017 are listed below. December 31, 2018 Outstanding Balance Weighted Average Rate Bank stock loan $ 15,450 5.50 % December 31, 2017 Outstanding Balance Weighted Average Rate Bank stock loan $ 2,500 4.50 % Future principal repayments of the December 31, 2018 outstanding balances are as follows. Due in one year or less $ 1,850 Due after one year through two years 1,600 Due after two years through three years 1,600 Due after three years through four years 1,600 Due after four years through five years 8,800 Thereafter — Total $ 15,450 The terms of the borrowing facility require the Company and Equity Bank to maintain minimum capital ratios and other covenants. The Company believes it is in compliance with the terms of the borrowing facility and has not been otherwise notified of noncompliance.

SUBORDINATED DEBENTURES

SUBORDINATED DEBENTURES	12 Months Ended
	Dec. 31, 2018
Brokers And Dealers [Abstract]
SUBORDINATED DEBENTURES	NOTE 12 – SUBORDINATED DEBENTURES In conjunction with the 2012 acquisition of First Community Bancshares, Inc. (FCB), the Company assumed certain subordinated debentures owed to special purpose unconsolidated subsidiaries that are controlled by the Company, FCB Capital Trust II and FCB Capital Trust III, (“CTII” and “CTIII”, respectively). On March 24, 2005, CTII, an unconsolidated subsidiary of the Company, issued $10,000 of variable rate trust preferred securities, all of which are outstanding at December 31, 2018 and 2017. The trust preferred securities issued by CTII accrue and pay distributions quarterly at three-month LIBOR plus 2.00% (4.44% at December 31, 2018 and 3.36% at December 31, 2017) on the stated liquidation amount of the trust preferred securities. As an integral part of the acquisition of FCB, the Company has guaranteed fully and unconditionally all of the obligations of CTII. The guaranty covers the quarterly distributions and payments on liquidation or redemption of the trust preferred securities. These trust preferred securities are mandatorily redeemable upon maturity on April 15, 2035 or upon earlier redemption. The Company has the right to redeem the trust preferred securities in whole or in part, on or after April 15, 2015 at a redemption price specified in the indenture plus any accrued but unpaid interest to the redemption date. The proceeds from the sale of the trust preferred securities and the issuance of $310 in common securities to FCB were used by CTII to purchase $10,310 of floating rate subordinated debentures of FCB which have the same payment terms as the trust preferred securities. On March 30, 2007, CTIII, an unconsolidated subsidiary of the Company, issued $5,000 of variable rate trust preferred securities, all of which are outstanding at December 31, 2018 and 2017. The trust preferred securities issued by CTIII accrue and pay distributions quarterly at three-month LIBOR plus 1.89% (4.68% at December 31, 2018, and 3.48% at December 31, 2017) on the stated liquidation amount of the trust preferred securities. As an integral part of the acquisition of FCB, the Company has guaranteed fully and unconditionally all of the obligations of CTIII. The guaranty covers the quarterly distributions and payments on liquidation or redemption of the trust preferred securities. These trust preferred securities are mandatorily redeemable upon maturity on June 15, 2037 or upon earlier redemption. The Company has the right to redeem the trust preferred securities in whole or in part at a redemption price specified in the indenture plus any accrued but unpaid interest to the redemption date. The proceeds from the sale of the trust preferred securities and the issuance of $155 in common securities to FCB were used by CTIII to purchase $5,155 of floating rate subordinated debentures of FCB which have the same payment terms as the trust preferred securities. In conjunction with the 2016 acquisition of Community First Bancshares, Inc. (CFBI), the Company assumed certain subordinated debentures owed to special purpose unconsolidated subsidiaries, Community First (AR) Statutory Trust I, (“CFSTI”). The trust preferred securities issued by CFSTI accrue and pay distributions quarterly at three-month LIBOR plus 3.25% (6.07% at December 31, 2018 and 4.92% at December 31, 2017) on the stated liquidation amount of the trust preferred securities. These trust preferred securities are mandatorily redeemable upon maturity on December 26, 2032 or upon earlier redemption. The common securities issued to the Company by the trusts possess sole voting rights with respect to matters involving those entities. The Company has the right to defer the payment of interest on all of its outstanding trust preferred securities. The Company has the right to declare such a deferral for up to 20 consecutive quarterly periods and deferral may only be declared as long as the Company is not then in default under the provisions of the Amended and Restated Trust Agreements. During the deferral period, interest on the indebtedness continues to accrue and the unpaid interest is compounded. As long as the deferral period continues, the Company is prohibited from: (i) declaring or paying any dividend on any of its capital stock, which would include both its common stock and the outstanding preferred stock issued to the Treasury, or (ii) making any payment on any debt security that is ranked equally with or junior to the securities issued by the trust. As a part of the acquisition of FCB, the Company recorded the debentures at an estimated fair value of $8,270. As part of the acquisition of CFBI, the Company recorded the debentures at an estimated fair value of $4,187. The initial fair value adjustments will be amortized against earnings on a prospective basis. At December 31, 2018 and 2017, the contractual balance and the unamortized fair value adjustments were as shown below. 2018 2017 Contractual balance $ 20,620 $ 20,620 Unamortized fair value adjustment (6,360 ) (6,652 ) Net book value $ 14,260 $ 13,968 Subordinated debentures are included in Tier 1 capital for purposes of determining the Company’s compliance with regulatory capital requirements.

CONTRACTUAL OBLIGATIONS

CONTRACTUAL OBLIGATIONS	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
CONTRACTUAL OBLIGATIONS	NOTE 13 – CONTRACTUAL OBLIGATIONS At December 31, 2018 and 2017, the Company had contractual obligations of $3,965 and $1,967. Contractual obligations represent commitments made by the Company to make capital investments in limited-liability entities that invest in qualified affordable housing projects. The Company expects to fulfill these commitments during the years 2019 through 2033.

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
STOCKHOLDERS' EQUITY	NOTE 14 – STOCKHOLDERS’ EQUITY Preferred Stock The Company’s articles of incorporation provide for the issuance of 10,000,000 shares of preferred stock. On August 11, 2011, as part of the Small Business Lending Fund (“SBLF”), the Company entered into an SBLF Purchase Agreement with the United States Treasury. Under the SBLF Purchase Agreement, the Company issued the Series C preferred stock having a per share liquidation amount of $1,000 per share. The Series C preferred stock qualified as Tier 1 capital and paid quarterly dividends at a rate of 1.0% at December 31, 2015. At December 31, 2015, there were 16,372 shares of senior non-cumulative perpetual preferred stock, Series C (the Series C preferred stock) issued and outstanding. A portion of the proceeds of the IPO were used to redeem the Series C preferred stock on January 4, 2016 at liquidation amount of $16,372. There were no shares of preferred stock outstanding at December 31, 2018, 2017 or 2016. Common stock The Company’s articles of incorporation provide for the issuance of 45,000,000 shares of Class A voting common stock (“Class A common stock”) and 5,000,000 shares of Class B non-voting common stock (“Class B common stock”), both of which have a par value of $0.01 per share. At December 31, 2018 and 2017, the following table presents shares that were issued and were held in treasury or were outstanding. 2018 2017 Class A common stock – issued 17,244,138 15,876,650 Class A common stock – held in treasury (1,271,043 ) (1,271,043 ) Class A common stock – outstanding 15,973,095 14,605,607 Class B common stock – issued 234,903 234,903 Class B common stock – held in treasury (234,903 ) (234,903 ) Class B common stock – outstanding — — Treasury stock is stated at cost, determined by the first-in, first-out method. On March 10, 2017, the Company completed its merger with Prairie State Bancshares, Inc. (“Prairie”) of Hoxie, Kansas. There were a total of 479,465 shares of Class A common stock issued in connection with this merger. On November 10, 2017, the Company completed its mergers with Eastman National Bancshares, Inc. (“Eastman”) of Newkirk, Oklahoma and Cache Holdings, Inc. (“Cache”) of Tulsa, Oklahoma. There were a total of 1,179,747 shares of Class A common stock issued in connection with the Eastman merger and 1,190,941 shares of Class A common stock issued in connection with the Cache merger. On May 4, 2018, the Company completed its mergers with Kansas Banking Corporation (“KBC”), of Liberal, Kansas, and Adams Dairy Bancshares, Inc. (“Adams”) of Blue Springs, Missouri. There were a total of 820,849 shares of Class A common stock issued in connection with the KBC merger and 344,063 shares of Class A common stock issued in connection with the Adams merger. Restricted stock unit plan termination loans In connection with termination of the Company’s restricted stock unit plan (“RSUP”), 203,216 shares of Class A common stock were issued in May 2015 to employees with vested restricted stock units. Additional paid-in capital includes $224 of tax benefits in excess of those previously provided in connection with stock compensation expense. Also in connection with the termination of the RSUP, the Company agreed to loan electing participants an amount equal to each participant’s federal and state income tax withholding obligation associated with the stock issuance. These loans totaling $121 at December 31, 2018, are collateralized by the shares received with a maturity date of December 31, 2019, and an interest rate of 1.68%. Accumulated other comprehensive income (loss) For the years ended December 31, 2018 and 2017, accumulated other comprehensive income consisted of (i) the after-tax effect of unrealized gains (losses) on available-for-sale securities and (ii) the after-tax effect of unamortized unrealized gains (losses) on securities transferred from the available-for-sale designation to the held-to-maturity designation. During 2018, 2017 and 2016, gains of $0, $271 and $893 were reclassified from accumulated other comprehensive income to net gains on sales of and settlement of securities within the consolidated statement of income and $453, $532 and $615 of accretion expense were reclassified from accumulated other comprehensive income to taxable interest income on securities within the consolidated statement of income. Components of accumulated other comprehensive income as of December 31, 2018 and 2017 were as follows. Available -for-Sale Securities Held-to -Maturity Securities Accumulated Other Comprehensive Income December 31, 2018 Net unrealized or unamortized gains (losses) $ (4,628 ) $ (1,891 ) $ (6,519 ) Tax effect 1,173 479 1,652 $ (3,455 ) $ (1,412 ) $ (4,867 ) December 31, 2017 Net unrealized or unamortized gains (losses) $ (1,797 ) $ (2,344 ) $ (4,141 ) Tax effect 455 594 1,049 $ (1,342 ) $ (1,750 ) $ (3,092 )

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 15 – INCOME TAXES Income tax expense is listed in the following table. 2018 2017 2016 Current income tax expense Federal $ 4,655 $ 6,474 $ 2,863 State 2,212 1,282 723 Total current income tax expense 6,867 7,756 3,586 Deferred income tax expense Federal 2,933 2,550 865 State 550 71 44 Total deferred income tax expense 3,483 2,621 909 Total income tax expense $ 10,350 $ 10,377 $ 4,495 A reconciliation of income tax expense at the U.S. federal statutory rate (21% in 2018; 35% in 2017and 2016) to the Company’s actual income tax expense is shown below. 2018 2017 2016 Computed at the statutory rate $ 9,697 $ 10,862 $ 4,854 Increase (decrease) resulting from: State and local taxes, net of federal benefit 1,962 717 449 Tax-exempt interest (844 ) (1,177 ) (576 ) Non-taxable life insurance income (462 ) (506 ) (350 ) Non-deductible expenses 530 376 689 Share-based payments (23 ) (335 ) — Federal tax credits (568 ) (660 ) (625 ) Change in valuation allowance 336 187 65 Effect of tax reform — 1,086 — Other (278 ) (173 ) (11 ) Income tax expense $ 10,350 $ 10,377 $ 4,495 On December 22, 2017, Tax Reform was enacted which reduced the U.S. federal statutory income tax rate from 35% to 21% effective January 1, 2018. The Company accounted for the effects of Tax Reform in the period of enactment as required by generally accepted accounting principles using reasonable estimates based on information available in December 2017. The Company has completed its accounting for the effects of Tax Reform and no additional income tax expense was recorded in 2018. The direct impact to the 2017 financial statements was the re-measurement of the Company’s December 31, 2017, deferred tax assets and liabilities which were expected to reverse beginning in 2018. The re-measurement of the Company’s net deferred tax asset resulted in $1,086 additional income tax expense being recognized in 2017, including a $535 decrease in the net deferred tax assets related to unrealized or unamortized losses on securities. The impact of this re-measurement is included in the statutory rate reconciliation above. With the exception of the revaluation adjustment required by Tax Reform, the deferred tax effects of unrealized or unamortized gains and losses on securities are recorded directly to stockholders’ equity as part of other comprehensive income. Effective January 1, 2017, the Company adopted the provisions of ASU 2016-09 on a prospective basis. In accordance with ASU 2016-09, $23 and $335 tax benefits, which were generated when the tax deduction for share-based payments exceeded book compensation costs, reduced income tax expense for the years ended December 31, 2018 and 2017. Prior to the adoption of ASU 2016-09, excess tax benefits associated with share-based payments were recognized in paid-in-capital and totaled $13 in 2016. Components of deferred tax assets and liabilities are shown in the table below. 2018 2017 Deferred tax assets Allowance for loan losses $ 2,880 $ 2,121 Net unrealized or unamortized losses on securities 1,639 1,034 Tax credit carryforwards 974 974 Accrued compensation 1,675 1,208 Net operating loss carryforwards 1,003 797 Other real estate owned 656 588 Acquired loans fair market value adjustments 4,058 4,532 Other 1,072 404 Gross deferred tax assets 13,957 11,658 Deferred tax liabilities Assumed debt fair market value adjustments 1,537 1,607 Goodwill amortization 1,492 1,267 Depreciation 3,288 1,831 Federal Home Loan Bank stock dividends 1,123 764 Core deposit intangibles 4,293 2,301 Other 283 360 Gross deferred tax liabilities 12,016 8,130 State valuation allowance (908 ) (571 ) Net deferred tax asset $ 1,033 $ 2,957 Deferred income tax balances reflect the effects of temporary differences between the carrying amounts of assets and liabilities and their tax basis and are stated at enacted tax rates expected to be in effect when taxes are actually paid or recovered. In 2018, the Company recognized deferred tax assets of $2,522 and deferred tax liabilities of $2,190 for temporary differences associated with the KBC merger and deferred tax assets of $1,134 and deferred tax liabilities of $518 for temporary differences associated with the Adams merger. Deferred tax assets of $34 were recognized in connection with the CBT merger. In 2017, the Company recognized deferred tax assets of $2,832 and deferred tax liabilities of $2,075 for temporary differences associated with the Eastman merger and deferred tax assets of $1,446 and deferred tax liabilities of $694 for temporary differences associated with the Cache merger. Federal net operating losses, acquired through previous acquisitions, totaled $464 at December 31, 2018 and will expire between 2031 and 2033. Acquired federal tax credits totaling $974 will expire between 2027 and 2033. The utilization of these net operating loss and tax credit carryforwards are not expected to be limited by internal revenue code sections 382 and 383. The Company and its subsidiaries are subject to U.S. federal income tax as well as income tax of the states of Arkansas, Kansas, Missouri, Oklahoma and Iowa. Commercial banks are not allowed to file consolidated Kansas returns with non-bank consolidated group members. The Company has unused state operating loss carryforwards of approximately $25,141 that expire between 2020 and 2028 resulting from the separate Kansas returns of the Company and SA Holdings, Inc. These operating losses, as well as certain deferred tax assets, have a full valuation allowance recorded against them resulting in a zero carrying value. In connection with a 2015 acquisition, the Company acquired Kansas net operating losses useable against Kansas bank income. At December 31, 2018, the Kansas net operating loss carryforward useable against Kansas bank income totaled $2,885 with expiration dates between 2020 and 2024. The utilization of this acquired Kansas net operating loss carryforward is expected to be limited, and a valuation allowance has been recorded against the portion which is expected to expire unused. In establishing a valuation allowance management considers whether it is more likely than not that some or all of the deferred tax assets will not be realized. The Company is no longer subject to examination by taxing authorities for years before 2015. At December 31, 2018, there were no examinations in any jurisdiction.

REGULATORY MATTERS

REGULATORY MATTERS	12 Months Ended
	Dec. 31, 2018
Banking And Thrift [Abstract]
REGULATORY MATTERS	NOTE 16 – REGULATORY MATTERS Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. The final rules implementing the Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) became effective for the Company on January 1, 2015, with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. The Basel III rules also require banks to maintain a Common Equity Tier 1 capital ratio of 6.5%, a total Tier 1 capital ratio of 8%, a total capital ratio of 10% and a leverage ratio of 5% to be deemed “well capitalized” for purposes of certain rules and prompt corrective action requirements. The risk-based ratios include a “capital conservation buffer” of 2.5%. The new capital conservation buffer requirement is to be phased in beginning in January 2016 at 0.625% of risk-weighted assets and will increase by that amount each year until fully implemented in January 2019. An institution would be subject to limitations on certain activities, including payment of dividends, share repurchases and discretionary bonuses to executive officers, if its capital level is below the buffer amount. Management believes as of December 31, 2018, the Company and Bank meet all capital adequacy requirements to which they are subject. Prompt corrective action regulations provide five classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized, although these terms are not used to represent overall financial condition. If adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as are asset growth and acquisitions and capital restoration plans are required. As of December 31, 2018, the most recent notifications from the federal regulatory agencies categorized Equity Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, Equity Bank must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed Equity Bank’s category. The Company’s and Equity Bank’s capital amounts and ratios at December 31, 2018 and 2017 are presented in the tables below. Ratios provided for Equity Bancshares, Inc. represent the ratios of the Company on a consolidated basis. Actual Minimum Required for Capital Adequacy Under Basel III Phase-In Minimum Required for Capital Adequacy Under Basel III Fully Phased-In To Be Well Capitalized Under Prompt Corrective Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2018 Total capital to risk weighted assets Equity Bancshares, Inc. $ 337,649 11.92 % $ 279,621 9.88 % $ 297,319 10.50 % $ N/A N/A Equity Bank 338,180 11.96 % 279,244 9.88 % 296,918 10.50 % 282,779 10.00 % Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 326,195 11.52 % 222,989 7.88 % 240,687 8.50 % N/A N/A Equity Bank 326,726 11.55 % 222,688 7.88 % 240,362 8.50 % 226,223 8.00 % Common equity Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 311,935 11.02 % 180,515 6.38 % 198,213 7.00 % N/A N/A Equity Bank 326,726 11.55 % 180,271 6.38 % 197,945 7.00 % 183,806 6.50 % Tier 1 leverage to average assets Equity Bancshares, Inc. 326,195 8.60 % 151,731 4.00 % 151,731 4.00 % N/A N/A Equity Bank 326,726 8.62 % 151,590 4.00 % 151,590 4.00 % 189,488 5.00 % Actual Minimum Required for Capital Adequacy Under Basel III Phase-In Minimum Required for Capital Adequacy Under Basel III Fully Phased-In To Be Well Capitalized Under Prompt Corrective Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2017 Total capital to risk weighted assets Equity Bancshares, Inc. $ 288,353 12.54 % $ 212,705 9.25 % $ 241,449 10.50 % $ N/A N/A Equity Bank 279,712 12.17 % 212,682 9.25 % 241,423 10.50 % 229,927 10.00 % Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 279,855 12.17 % 166,715 7.25 % 195,459 8.50 % N/A N/A Equity Bank 271,214 11.80 % 166,697 7.25 % 195,438 8.50 % 183,942 8.00 % Common equity Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 265,887 11.56 % 132,222 5.75 % 160,966 7.00 % N/A N/A Equity Bank 271,214 11.80 % 132,208 5.75 % 160,949 7.00 % 149,452 6.50 % Tier 1 leverage to average assets Equity Bancshares, Inc. 279,855 10.33 % 108,372 4.00 % 108,372 4.00 % N/A N/A Equity Bank 271,214 10.01 % 108,351 4.00 % 108,351 4.00 % 135,439 5.00 % Equity Bank is subject to certain restrictions on the amount of dividends that it may declare without prior regulatory approval.

RELATED-PARTY TRANSACTIONS

RELATED-PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
RELATED-PARTY TRANSACTIONS	NOTE 17 – RELATED PARTY TRANSACTIONS At December 31, 2018 and 2017, the Company had loans outstanding to executive officers, directors, significant stockholders, and their affiliates (related parties), in the amount of $2,267 and $3,892. Changes during 2018 are listed below. 2018 Balance at January 1, 2018 $ 3,892 New loans/advances 1,803 Repayments (3,428 ) Balance at December 31, 2018 $ 2,267 At December 31, 2018 and 2017, the Company had deposits from executive officers, directors, significant stockholders, and their affiliates (related parties), in the amount of $6,127 and $6,274.

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS	12 Months Ended
	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
EMPLOYEE BENEFITS	NOTE 18 – EMPLOYEE BENEFITS The Company has a defined contribution profit sharing plan and a retirement savings 401(k) plan covering substantially all employees. Employees may contribute up to $19 of their compensation. Contributions to the profit sharing plan and 401(k) plan are discretionary and are determined annually by the Board of Directors. Employer contributions charged to expense for 2018, 2017 and 2016 were $885, $704 and $479. As a result of the acquisition of First Independence, the Company assumed the obligations related to First Independence’s participation in the Pentegra Defined Benefit Plan for Financial Institutions, a tax-qualified defined benefit pension plan. The Pentegra Defined Benefit Plan is treated as a multi-employer plan for accounting purposes but operates as a multiple-employer plan under the Employee Retirement Income Security Act of 1974 (ERISA) and the Internal Revenue Code. As a result, certain multi-employer plan disclosures are not applicable to the Pentegra Defined Benefit Plan. Under the Pentegra Defined Benefit Plan, contributions made by a participating employer may be used to provide benefits to employees of other participating employers because assets contributed by an employer are not segregated in a separate account or restricted to provide benefits only to employees of that employer. Also, in the event a participating employer is unable to meet its contribution requirements, the required contributions for the other participating employers could increase proportionately. The Pentegra Defined Benefit Plan covered substantially all officers and employees of First Independence who began employment prior to December 31, 2009, with 55 participants retaining benefits under the plan. The Pentegra Defined Benefit Plan operates on a fiscal year from July 1 through June 30 and files one Form 5500 on behalf of all employers who participate in the plan. The Employer Identification Number is 13-5645888 and the three-digit plan number is 333. There are no collective bargaining agreements in place at the Company. The Pentegra Defined Benefit Plan’s annual valuation process includes calculating the plan’s funded status and separately calculating the funded status of each participating employer. The funded status is defined as the market value of assets divided by the funding target (100 percent of the present value of all benefit liabilities accrued at that date). As permitted by ERISA, the Pentegra Defined Benefit Plan accepts contributions for the prior plan year up to eight and a half months after the asset valuation date. As a result, the fair value of assets at the valuation date (July 1) will increase by any subsequent contributions designated for the immediately preceding plan year ended June 30. The most recent Form 5500 available for the Pentegra Defined Benefit Plan is for the year ended June 30, 2017. The following table presents the net pension cost and funded status of the Company relating to the Pentegra Defined Benefit Plan since the date of acquisition (dollar amounts in thousands). 2018 2017 Net pension cost charged to salaries and employee benefits $ 113 $ 84 Pentegra defined benefit plan funded status as of July 1 109.86 % 110.37 % Plan's funded status as of July 1 94.30 % 96.89 % Contributions paid to the plan $ 93 $ 65 The Company’s contributions to the Pentegra Defined Benefit Plan were less than 5.00% of the total contributions to the Pentegra Defined Benefit plan for the plan year ended June 30, 2018.

SHARE-BASED PAYMENTS

SHARE-BASED PAYMENTS	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
SHARE-BASED PAYMENTS	NOTE 19 – SHARE-BASED PAYMENTS The Company’s Amended and Restated 2013 Stock Incentive Plan (the Plan) reserved 1,500,000 shares for the grant of non-qualified stock options, restricted stock units, restricted stock and unrestricted stock to its employees and directors. The Plan replaced the 2006 Non-qualified Stock Option Plan (2006 Plan). Under the 2006 Plan, there were 150,000 and 150,000 fully vested and exercisable options outstanding at December 31, 2018 and 2017. No new grants of options may be made under the 2006 Plan. The Company believes that stock-based awards better align the interests of its employees with those of its stockholders. Under the Company’s director compensation policy, directors may elect to receive all or a portion of their fees in cash, Company stock or non-qualified stock options. During the years ended December 31, 2018 , 2017 and 2016, the Company recognized director compensation expense of $53, $46 and $32 and issued 1,375, 1,457 and 953 shares of Company stock pursuant to certain directors’ elections under the Company’s director compensation policy. At December 31, 2018, there were 614,424 shares available for equity awards under the Plan. Stock Option Awards The following tables summarize stock option activity for the years ended December 31, 2018 and 2017. December 31, 2018 Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Outstanding at beginning of year 797,521 $ 22.54 8 $ 10,261 Granted 99,935 34.69 10 — Exercised (6,800 ) (19.49 ) (8 ) — Forfeited or expired (38,100 ) (31.97 ) (10 ) — Outstanding at end of year 852,556 $ 23.57 7 $ 10,044 Fully vested and expected to vest 852,556 $ 23.57 7 $ 10,044 Exercisable at end of year 565,847 $ 19.44 4 $ 8,995 December 31, 2017 Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Outstanding at beginning of year 590,835 $ 16.69 7 $ 10,017 Granted 305,404 33.05 10 — Exercised (71,434 ) (17.01 ) (3 ) — Forfeited or expired (27,284 ) (27.72 ) (10 ) — Outstanding at end of year 797,521 $ 22.54 8 $ 10,261 Fully vested and expected to vest 797,521 $ 22.54 8 $ 10,261 Exercisable at end of year 484,728 $ 17.48 7 $ 8,692 The fair values of stock options granted during the years ended December 31, 2018, 2017 and 2016, were estimated to be $9.01 per share, $8.75 per share and $5.10 per share. The fair value of each option award is estimated on the date of grant using a closed form option valuation (Black-Scholes) model. Expected stock price volatility is based on the historical volatility of the SNL Bank Index. The expected term of options granted is based on the Simplified Method. The risk-free interest rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The fair values of options granted were determined using the following weighted-average assumptions as of grant dates. 2018 2017 2016 Risk free rate 2.45 % 2.20 % 1.58 % Market value of stock on grant date $ 34.69 $ 33.05 $ 25.44 Expected term (in years) 6.3 6.7 5.0 Expected volatility 19.71 % 19.66 % 19.08 % Dividend rate — % — % — % Compensation expense for stock options is recognized as the options vest. Total stock option compensation cost that has been charged against income was $813, $592, and $374 for 2018, 2017 and 2016. The total income tax benefit was $205, $226 and $143. At December 31, 2018, there was $2.0 million of unrecognized compensation expense related to non-vested stock options granted under the Plan. Unrecognized compensation expense at December 31, 2018, will be recognized over a remaining weighted average period of 7 years. Restricted Stock Unit Awards Restricted stock units (RSUs) granted to employees under the Plan represent the right to receive one share of Company stock upon vesting, in accordance with the vesting schedule provided in each award agreement. To the extent vested, the RSUs become Class A voting common stock within ten calendar days of the vesting date. Non-vested RSUs have no voting rights and are not considered outstanding until vesting. The fair value of the RSUs is determined by the closing price of the Company’s stock on the date of grant. A summary of changes in the Company’s non-vested RSUs for the year is shown below. Non-vested Restricted Stock Units Shares Weighted Average Grant Date Fair Value Non-vested RSUs at January 1, 2018 4,890 $ 33.50 Granted 145,288 36.89 Vested (14,401 ) (36.55 ) Forfeited (3,670 ) (37.57 ) Outstanding at end of year 132,107 $ 36.78 Compensation expense is recognized over the vesting period of the award based on the fair value of RSU awards at the grant date. The Company recognized share-based compensation attributable to RSUs of $1,643, $80 and $0 for the years ended December 31, 2018, 2017 and 2016. The total income tax benefit was $413, $31 and $0 for the same time periods. Unrecognized RSU compensation expense of $3.7 million at December 31, 2018, will be recognized over a remaining weighted average period of 3 years.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 20 – EARNINGS PER SHARE Earnings per share were computed as shown below. 2018 2017 2016 Basic: Net income allocable to common stockholders $ 35,825 $ 20,649 $ 9,373 Weighted average common shares outstanding 15,389,513 12,446,851 8,624,108 Weighted average vested restricted stock units 4,403 1,751 — Weighted average shares 15,393,916 12,448,602 8,624,108 Basic earnings per common share $ 2.33 $ 1.66 $ 1.09 Diluted: Net income allocable to common stockholders $ 35,825 $ 20,649 $ 9,373 Weighted average common shares outstanding for: Basic earnings per common share 15,393,916 12,448,602 8,624,108 Dilutive effects of the assumed exercise of stock options 293,588 255,947 131,418 Dilutive effects of the assumed redemption of RSUs 20,882 2,635 — Average shares and dilutive potential common shares 15,708,386 12,707,184 8,755,526 Diluted earnings per common share $ 2.28 $ 1.62 $ 1.07 Average outstanding stock options of 26,419, 141,891 and 92 for the years ending December 31, 2018, 2017 and 2016 were not included in the computation of diluted earnings per share because the options were antidilutive.

FAIR VALUE

FAIR VALUE	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE	NOTE 21 – FAIR VALUE The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. For disclosure purposes, the Company groups its financial and non-financial assets and liabilities into three different levels based on the nature of the instrument and the availability and reliability of the information that is used to determine fair value. The three levels of inputs that may be used to measure fair values are defined as follows. Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Level 1 inputs are considered to be the most transparent and reliable. The Company assumes the use of the principal market to conduct a transaction of each particular asset or liability being measured and then considers the assumptions that market participants would use when pricing the asset or liability. Whenever possible, the Company first looks for quoted prices for identical assets or liabilities in active markets (Level 1 inputs) to value each asset or liability. However, when inputs from identical assets or liabilities on active markets are not available, the Company utilizes market observable data for similar assets and liabilities. The Company maximizes the use of observable inputs and limits the use of unobservable inputs to occasions when observable inputs are not available. The need to use unobservable inputs generally results from the lack of market liquidity of the actual financial instrument or of the underlying collateral. Although, in some instances, third party price indications may be available, limited trading activity can challenge the implied value of those quotations. The following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of each instrument under the hierarchy. Fair Value of Assets and Liabilities Measured on a Recurring Basis The fair values of available-for-sale securities are carried at fair value on a recurring basis. To the extent possible, observable quoted prices in an active market are used to determine fair value and, as such, these securities are classified as Level 1. For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities, generally determined by matrix pricing, which is a mathematical technique widely used in the industry to value securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs). The Company’s available-for-sale securities, including residential mortgage-backed securities (all of which are issued or guaranteed by government sponsored agencies) and state and political subdivision securities are classified as Level 2. The fair values of derivatives are determined based on a valuation pricing model using readily available observable market parameters such as interest rate yield curves (Level 2 inputs) adjusted for credit risk attributable to the seller of the derivative. Assets and liabilities measured at fair value on a recurring basis are summarized below. December 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Available-for-sale securities: Residential mortgage-backed securities (issued by government-sponsored entities) $ — $ 168,875 $ — Derivative assets: Derivative assets (included in other assets) — 933 — Cash collateral held by counterparty and netting adjustments (242 ) — — Total derivative assets (242 ) 933 — Other assets: Equity securities with readily determinable fair value 475 — — Total other assets 475 — — Total assets 233 169,808 — Liabilities: Derivative liabilities: Derivative liabilities (included in other liabilities) — 777 — Cash collateral held by counterparty and netting adjustments (252 ) — — Total derivative liabilities (252 ) 777 — Total liabilities (252 ) 777 — December 31, 2017 (Level 1) (Level 2) (Level 3) Assets: Available-for-sale securities: Residential mortgage-backed securities (issued by government-sponsored entities) $ — $ 161,591 $ — State and political subdivisions — 195 — Equity securities 486 — — Derivative assets: Derivative assets (included in other assets) — 1 — Cash collateral held by counterparty and netting adjustments 164 — — Total derivative assets 164 1 — Total assets 650 161,787 — Liabilities: Derivative liabilities: Derivative liabilities (included in other liabilities) — 46 — Cash collateral held by counterparty and netting adjustments (46 ) — — Total derivative liabilities (46 ) 46 — Total liabilities (46 ) 46 — There were no transfers between Levels during 2018 or 2017. The Company’s policy is to recognize transfers into or out of a level as of the end of a reporting period. Fair Value of Assets and Liabilities Measured on a Non-recurring Basis Certain assets are measured at fair value on a non-recurring basis when there is evidence of impairment. The fair values of impaired loans with specific allocations of the allowance for loan losses are generally based on recent real estate appraisals of the collateral. Declines in the fair values of other real estate owned subsequent to their initial acquisitions are also based on recent real estate appraisals less selling costs. Real estate appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are typically significant and result in a Level 3 classification of the inputs for determining fair value. Assets measured at fair value on a non-recurring basis are summarized below. December 31, 2018 (Level 1) (Level 2) (Level 3) Impaired loans: Commercial real estate $ — $ — $ 6,212 Commercial and industrial — — 1,697 Residential real estate — — 4,123 Agricultural real estate — — 218 Other — — 809 Other real estate owned: Commercial real estate — — 1,391 Residential real estate — — 97 December 31, 2017 (Level 1) (Level 2) (Level 3) Impaired loans: Commercial real estate $ — $ — $ 1,439 Commercial and industrial — — 1,005 Residential real estate — — 4,021 Agricultural real estate — — 905 Other — — 1,910 Other real estate owned: Commercial real estate — — 1,018 Residential real estate — — 157 The Company did not record any liabilities for which the fair value was measured on a non-recurring basis during the years ended December 31, 2018 and 2017. Valuations of impaired loans and other real estate owned utilize third party appraisals or broker price opinions and are classified as Level 3 due to the significant judgment involved. Appraisals may include the utilization of unobservable inputs, subjective factors and utilize quantitative data to estimate fair market value. The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized with Level 3 of the fair value hierarchy. Fair Value Valuation Technique Unobservable Input Range (weighted average) December 31, 2018 Impaired loans $ 13,059 Sales Comparison Approach Adjustments for differences between comparable sales 4% - 22% (13%) December 31, 2017 Impaired loans $ 9,280 Sales Comparison Approach Adjustments for differences between comparable sales 15% - 26% (5%) Measurable inputs for other real estate owned are not material. Carrying amounts and estimated fair values of financial instruments at year end were as follows as of the date indicated. December 31, 2018 Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 192,818 $ 192,818 $ 192,818 $ — $ — Interest-bearing deposits 4,991 4,991 — 4,991 — Available-for-sale securities 168,875 168,875 — 168,875 — Held-to-maturity securities 748,356 739,989 — 739,989 — Loans held for sale 2,972 2,972 — 2,972 — Loans, net of allowance for loan losses 2,563,954 2,565,526 — — 2,565,526 Federal Reserve Bank and Federal Home Loan Bank stock 29,214 N/A N/A N/A N/A Interest receivable 17,372 17,372 — 17,372 — Derivative assets 933 933 — 933 — Cash collateral held by derivative counterparty (242 ) (242 ) (242 ) — — Total derivative assets 691 691 (242 ) 933 — Total assets $ 3,729,243 $ 3,693,234 $ 192,576 $ 935,132 $ 2,565,526 Financial liabilities: Deposits $ 3,123,447 $ 3,124,654 $ — $ 3,124,654 $ — Federal funds purchased and retail repurchase agreements 50,068 50,068 — 50,068 — Federal Home Loan Bank advances 384,898 384,898 — 384,898 — Bank stock loan 15,450 15,450 — 15,450 — Subordinated debentures 14,260 14,260 — 14,260 — Contractual obligations 3,965 3,965 — 3,965 — Interest payable 3,648 3,648 — 3,648 — Derivative liabilities 777 777 — 777 — Cash collateral held by derivative counterparty (252 ) (252 ) (252 ) — — Total derivative liabilities 525 525 (252 ) 777 — Total liabilities $ 3,596,261 $ 3,597,468 $ (252 ) $ 3,597,720 $ — December 31, 2017 Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 52,195 $ 52,195 $ 52,195 $ — $ — Interest-bearing deposits 3,496 3,496 — 3,496 — Available-for-sale securities 162,272 162,272 486 161,786 — Held-to-maturity securities 535,462 532,744 — 532,744 — Loans held for sale 2,353 2,353 — 2,353 — Loans, net of allowance for loan losses 2,108,772 2,112,422 — — 2,112,422 Federal Reserve Bank and Federal Home Loan Bank stock 24,373 N/A N/A N/A N/A Interest receivable 12,371 12,371 — 12,371 — Derivative assets 1 1 — 1 — Cash collateral held by derivative counterparty 164 164 164 — — Total derivative assets 165 165 164 1 — Total assets $ 2,901,459 $ 2,878,018 $ 52,845 $ 712,751 $ 2,112,422 Financial liabilities: Deposits $ 2,382,013 $ 2,385,528 $ — $ 2,385,528 $ — Federal funds purchased and retail repurchase agreements 37,492 37,492 — 37,492 — Federal Home Loan Bank advances 347,692 347,692 — 347,692 — Bank stock loan 2,500 2,500 — 2,500 — Subordinated debentures 13,968 13,968 — 13,968 — Contractual obligations 1,967 1,967 — 1,967 — Interest payable 1,932 1,932 — 1,932 — Derivative liabilities 46 46 — 46 — Cash collateral held by derivative counterparty (46 ) (46 ) (46 ) — — Total derivative liabilities — — (46 ) 46 — Total liabilities $ 2,787,564 $ 2,791,079 $ (46 ) $ 2,791,125 $ — The methods and assumptions, not previously presented, used to estimate fair values are described as follows. Cash and cash equivalents and interest-bearing deposits Held-to-maturity securities Loans held for sale Loans Federal Reserve Bank and Federal Home Loan Bank stock Interest receivable and interest payable Deposits Federal funds purchased and retail repurchase agreements Federal Home Loan Bank Advances Bank stock loan Subordinated debentures Contractual obligations The fair value of off-balance-sheet items is not considered material.

COMMITMENTS AND CREDIT RISK

COMMITMENTS AND CREDIT RISK	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
COMMITMENTS AND CREDIT RISK	NOTE 22 – COMMITMENTS AND CREDIT RISK The Company extends credit for commercial real estate mortgages, residential mortgages, working capital financing and loans to businesses and consumers. Commitments to Originate Loans and Available Lines of Credit: Commitments to originate loans and available lines of credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments and lines of credit generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since a portion of the commitments and lines of credit may expire without being drawn upon, the total commitment and lines of credit amounts do not necessarily represent future cash requirements. Each customer’s creditworthiness is evaluated on a case-by-case basis. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the counterparty. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, commercial real estate, and residential real estate. Mortgage loans in the process of origination represent amounts that the Company plans to fund within a normal period of 60 to 90 days and are intended for sale to investors in the secondary market. The contractual amounts of commitments to originate loans and available lines of credit as of December 31, 2018 and 2017 were as as follows. December 31, 2018 December 31, 2017 Fixed Rate Variable Rate Fixed Rate Variable Rate Commitments to make loans $ 29,543 $ 171,857 $ 38,031 $ 67,107 Mortgage loans in the process of origination 6,785 2,860 14,803 9,258 Unused lines of credit 92,225 167,218 87,948 141,026 At December 31, 2018, the fixed rate loan commitments have interest rates ranging from 3.75% to 8.50% and maturities ranging from 1 month to 81 months. Standby Letters of Credit: Standby letters of credit are irrevocable commitments issued by the Company to guarantee the performance of a customer to a third party once specified pre-conditions are met. Financial standby letters of credit are primarily issued to support public and private borrowing arrangements, including commercial paper, bond financing, and similar transactions. Performance standby letters of credit are issued to guarantee performance of certain customers under non-financial contractual obligations. The credit risk involved in issuing standby letters of credit is essentially the same as that involved in extending loans to customers. The contractual amounts of standby letters of credit as of December 31, 2018 and 2017 are listed below. December 31, 2018 December 31, 2017 Fixed Rate Variable Rate Fixed Rate Variable Rate Standby letters of credit $ 4,474 $ 2,716 $ 4,064 $ 3,830

LEGAL MATTERS

LEGAL MATTERS	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
LEGAL MATTERS	NOTE 23 – LEGAL MATTERS The Company is party to various matters of litigation in the ordinary course of business. The Company periodically reviews all outstanding pending or threatened legal proceedings and determines if such matters will have an adverse effect on the business, financial condition or results of operations or cash flows. A loss contingency is recorded when the outcome is probable and reasonably able to be estimated. The following loss contingencies have been identified by the Company as reasonably possible to result in an unfavorable outcome for the Company. Equity Bank is a party to a February 3, 2015, lawsuit filed against it by CitiMortgage, Inc. (“Citi”). The lawsuit involves an alleged breach of contract related to loan repurchase obligations and damages of $2,700 plus pre-judgment and post-judgment interest. In January 2018, final judgement was entered by the court dismissing Citi’s claims with regard to six loans and holding Equity Bank liable with regard to six loans. A loss contingency of $477 was recorded at December 31, 2017, in connection with the resolution of this case. Subsequently Citi appealed the courts decision. The Company believes it has numerous and meritorious defenses to the claims and continues to contest the matter vigorously. Except for the above mentioned lawsuit and settlement, there have been no other claims for potential repurchase or indemnification demands regarding mortgage loans originated by Equity Bank and sold to investors. However, the Company believes there is possible risk it may face similar demands based on comparable demands loan aggregators are facing from their investors, including Government Sponsored Entities such as Freddie Mac and Fannie Mae and/or settlement agreements loan aggregators have entered into with those investors. The amount of potential loss and outcome of such possible litigation, if it were commenced, is uncertain and the Company would vigorously contest any claims.

CONDENSED FINANCIAL INFORMATION

CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY)	NOTE 24 – CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY) Presented below is the condensed financial information as to financial position, results of operations and cash flows of the Parent Company. CONDENSED BALANCE SHEET 2018 2017 ASSETS Cash and due from banks $ 1,540 $ 4,201 Investment in Equity Bank 470,902 379,933 Investment in EBAC 3,262 — Other assets 10,490 6,762 Total assets $ 486,194 $ 390,896 LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities $ 30,253 $ 16,752 Stockholders’ equity 455,941 374,144 Total liabilities and stockholders’ equity $ 486,194 $ 390,896 CONDENSED STATEMENT OF INCOME 2018 2017 2016 Dividends from Equity Bank $ 30,500 $ 17,250 $ 9,500 Other income 3 26 1 Total income 30,503 17,276 9,501 Expenses Interest expense 1,918 996 701 Other expenses 3,358 3,018 2,408 Total expenses 5,276 4,014 3,109 Income (loss) before income tax and equity in undistributed income of subsidiaries 25,227 13,262 6,392 Income tax benefit 1,025 2,017 859 Income (loss) before equity in undistributed income (loss) of subsidiaries 26,252 15,279 7,251 Equity in undistributed income (loss) of Equity Bank 9,681 5,370 2,123 Equity in undistributed income (loss) of EBAC (108 ) — — Net income 35,825 20,649 9,374 Dividends and discount accretion on preferred stock — — (1 ) Net income allocable to common stockholders $ 35,825 $ 20,649 $ 9,373 CONDENSED STATEMENT OF CASH FLOWS 2018 2017 2016 Cash flows from operating activities Net income $ 35,825 $ 20,649 $ 9,374 Adjustments to reconcile net income to net cash from operating activities: Stock based compensation 2,509 1,100 553 Equity in undistributed (income) loss of Equity Bank (9,681 ) (5,370 ) (2,123 ) Equity in undistributed (income) loss of EBAC 108 — — Net amortization of purchase valuation adjustments 292 284 246 Net change in: Other assets (4,092 ) (1,331 ) (1,529 ) Interest payable and other liabilities (50 ) (1,419 ) (409 ) Net cash from (to) operating activities 24,911 13,913 6,112 Cash flows (to) from investing activities Proceeds from sale of other real estate owned — 267 — Purchase stock of Community First, net of holding company cash acquired — — (9,549 ) Purchase stock of Prairie, net of holding company cash acquired — (12,510 ) — Purchase stock of Eastman, net of holding company cash acquired (55 ) (7,813 ) — Purchase stock of Cache, net of holding company cash acquired — (13,103 ) — Purchase stock of KBC, net of holding company cash acquired (14,151 ) — — Purchase stock of Adams, net of holding company cash acquired (4,179 ) — — Purchase assets of City Bank, net of liabilities assumed (18,900 ) Purchase of net assets of EBAC (3,370 ) — — Net cash (used in) investing activities (40,655 ) (33,159 ) (9,549 ) Cash flows (to) from financing activities Borrowings on bank stock loan 22,500 2,500 6,000 Principal payments on bank stock loan (9,550 ) (1,000 ) (33,218 ) Proceeds from the issuance of common stock, net — — 23,643 Proceeds from exercise of employee stock options 133 1,215 112 Principal payments on employee stock loan — 121 — Redemption of Series C preferred stock — — (16,372 ) Dividends paid on preferred stock — — (42 ) Excess tax benefits recognized on exercise of employee stock options — — 13 Net cash provided by (used in) financing activities 13,083 2,836 (19,864 ) Net change in cash and cash equivalents (2,661 ) (16,410 ) (23,301 ) Cash and cash equivalents, beginning of period 4,201 20,611 43,912 Ending cash and cash equivalents $ 1,540 $ 4,201 $ 20,611

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	NOTE 25 – SUBSEQUENT EVENTS On September 21, 2018, the Company entered into a branch purchase and assumption agreement with MidFirst Bank (“MidFirst”) to acquire two branches in Guymon, Oklahoma and one branch in Cordell, Oklahoma. The transaction closed February 8, 2019. Information necessary to recognize the fair value of assets acquired and liabilities assumed remains incomplete. At the time of the acquisition, total assets transferred were approximately $14,144, which included total loans of approximately $6,507. Also, at the time of the acquisition, total liabilities transferred were approximately $98,606, which included total deposits of approximately $98,543. The Company anticipates there will be goodwill and core deposit intangibles recorded with this merger. Goodwill is calculated as the excess of the cash consideration transferred over the net of the acquisition-date fair value of identifiable assets acquired and liabilities assumed.

NATURE OF OPERATIONS AND SUMM_2

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations Equity Bank is a Kansas state-chartered bank and member of the Federal Reserve (state Fed member bank jointly supervised by both the Federal Reserve Bank of Kansas City and the Office of the Kansas State Bank Commissioner). The Company is primarily engaged in providing a full range of banking, mortgage banking and financial services to individual and corporate customers generally in Arkansas, Kansas, Missouri and Oklahoma. Equity Bank competes with a variety of other financial institutions including large regional banks, community banks and thrifts as well as credit unions and other non-traditional lenders.
Use of Estimates	Use of Estimates
Cash Equivalents	Cash Equivalents
Securities	Securities Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield basis without anticipating prepayments, except for certain securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. All OTTI related to equity securities is recognized through earnings. Equity investments with a readily determinable fair value are measured at fair value with changes in fair value recognized in net income. The exit price concept is used when measuring the fair value of financial instruments for disclosure purposes.
Loans Held for Sale	Loans Held for Sale
Loans	Loans Purchased Credit Impaired Loans. As a part of acquisitions, the Company acquired certain loans, for which there was, at acquisition, evidence of deterioration of credit quality since origination. These purchased credit impaired loans were recorded at the acquisition date fair value, such that there is no carryover of the seller’s allowance for loan losses. After acquisition, losses are recognized by an increase in the allowance for loan losses. Such purchase credit impaired loans are accounted for individually. The Company estimates the amount and timing of expected cash flows for each loan, and the expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loan (accretable yield). During acquisitions, if the Company expects to liquidate the loan collateral in a relatively short period of time, the Company will assign no value to accretable yield as the impact is immaterial. The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (non-accretable difference). Over the life of the loan, expected cash flows continue to be estimated. If the present value of the expected cash flows is less than the carrying amount, a loss is recorded. If the present value of the expected cash flows is greater than the carrying amount, it is recognized as part of future interest income. Nonaccrual Loans. Generally, loans are designated as nonaccrual when either principal or interest payments are 90 days or more past due based on contractual terms unless the loan is well secured and in the process of collection. Consumer loans are typically charged off no later than 180 days past due. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed against income. Future interest income may be recorded on a cash basis after recovery of principal is reasonably assured. Nonaccrual loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Impaired Loans. A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect all contractual principal and interest due according to the terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or on the value of the underlying collateral if the loan is collateral dependent. The Company evaluates the collectability of both principal and interest when assessing the need for a loss accrual. 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. Troubled Debt Restructurings . In cases where a borrower experiences financial difficulties and the Company makes certain concessionary modifications to contractual terms, the loan is classified as a troubled debt restructured loan and classified as impaired. Generally, a nonaccrual loan that is a troubled debt restructuring remains on nonaccrual until such time that repayment of the remaining principal and interest is not in doubt and the borrower has a period of satisfactory repayment performance.
Allowance for Loan Losses	Allowance for Loan Losses The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported net at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the sale of the collateral. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. The general component of the allowance for loan losses covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio and class and is based on the actual loss history experienced by the Company. This actual loss experience is then adjusted by comparing current conditions to the conditions that existed during the loss history. The Company considers the changes related to (i) lending policies, (ii) economic conditions, (iii) nature and volume of the loan portfolio and class, (iv) lending staff, (v) volume and severity of past due, non-accrual, and risk graded loans, (vi) loan review system, (vii) value of underlying collateral for collateral dependent loans, (viii) concentration levels and (ix) effects of other external factors. The Company considers loan performance and collateral values in assessing risk for each class in the loan portfolio, as follows: • Commercial and industrial loans are dependent on the strength of the industries of the related borrowers and the success of their businesses. Commercial and industrial loans are advanced for equipment purchases, to provide working capital or meet other financing needs of the business. These loans may be secured by accounts receivable, inventory, equipment or other business assets. Financial information is obtained from the borrower to evaluate the debt service coverage and ability to repay the loans. • Commercial real estate loans are dependent on the industries tied to these loans, as well as the local commercial real estate market. The loans are secured by real estate and typically appraisals are obtained to support the loan amount. Generally, an evaluation of the project’s cash flows is performed to evaluate the borrower’s ability to repay the loan at the time of origination and periodically updated during the life of the loan. • Residential real estate loans are affected by the local residential real estate market, the local economy and movement in interest rates. The Company evaluates the borrower’s repayment ability through a review of credit reports and debt to income ratios. Generally, appraisals are obtained to support the loan amount. • Agricultural real estate loans are real estate loans related to farmland and are affected by the value of farmland. Generally, the Company evaluates the borrower’s ability to repay based on cash flows from farming operations. • Consumer loans are dependent on the local economy. Consumer loans are generally secured by consumer assets, but may be unsecured. Typically, the Company evaluates the borrower’s repayment ability through a review of credit scores and an evaluation of debt to income ratios. • Agricultural loans are primary operating lines subject to annual farming revenues, including productivity and yield of the farm products and market pricing at the time of sale. There have been no material changes to the Company’s accounting policies related to its allowance for loan loss methodology during 2018 and 2017.
Transfers of Financial Assets	Transfers of Financial Assets
Bank Owned Life Insurance	Bank-Owned Life Insurance
Other Real Estate Owned	Other Real Estate Owned
Premises and Equipment	Premises and Equipment Premises and equipment and other long-term assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Federal Reserve Bank and Federal Home Loan Bank Stock	Federal Reserve Bank and Federal Home Loan Bank Stock
Goodwill and Core Deposit Intangibles	Goodwill and Core Deposit Intangibles
Credit Related Financial Instruments	Credit Related Financial Instruments
Derivatives	Derivatives An interest rate swap is an agreement between two entities to exchange cash flows in the future. The agreement sets the dates on which the cash flows will be paid and the manner in which the cash flows will be calculated. Typically, an interest rate swap transaction is used as an exchange of cash flows based on a fixed rate for cash flows based on a variable rate. In an interest rate cap agreement, a cash flow is generated if the price or interest rate of an underlying variable rises above a certain threshold price or interest rate. In an interest rate floor agreement, a cash flow is generated if the price or interest rate of an underlying variable falls below a certain threshold price or interest rate. Caps and floors are designed as protection against the interest rate on a variable rate asset or liability rising above or falling below a certain level. At the inception of a derivative contract, the Company designates the derivatives as one of three types based on the Company’s intentions and belief as to likely effectiveness as a hedge. These three types are: (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”); (2) a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”); or (3) an instrument with no hedging designation (“stand-alone derivative”). For a fair value hedge, the gain or loss on the derivative, as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair value changes. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income and is reclassified into earnings in the same periods during which the hedged transaction affects earnings. For both types of hedges, changes in the fair value of derivatives that are not highly effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings as non-interest income. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Net cash settlements on derivatives that do not qualify for hedge accounting are reported in non-interest income. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged unless the derivative meets the criteria to be a financing derivative. All derivatives are recognized in the consolidated balance sheet at their fair values and are reported as either derivative assets or derivative liabilities net of accrued net settlements and collateral, if any. The individual derivative amounts are netted by counterparty when the netting requirements have been met. If these netted values are positive, they are classified as an asset and, if negative, they are classified as a liability. The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, at least quarterly, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm or treatment of the derivative as a hedge is no longer appropriate or intended. When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that are accumulated in other comprehensive income are amortized into earnings over the same periods which the hedged transactions will affect earnings. The Company has entered into interest rate cap derivatives to assist with interest rate risk management. These derivatives are not designated as hedging instruments but rather as stand-alone derivatives. The fair values of stand-alone derivatives are included in other assets and other liabilities. Changes in fair value of stand-alone derivatives are recorded through earnings as non-interest income.
Income Taxes	Income Taxes As a result of Tax Reform enacted in December 2017, the Company recognized a $1,086 re-measurement of its net deferred tax assets, including a re-measurement of $535 in a net deferred tax asset related to unrealized losses on available-for-sale securities and held-to-maturity securities previously transferred from available-for-sale. Because the tax effect of variations in unrealized losses on available-for-sale securities and transferred held-to-maturity securities impact accumulated other comprehensive income, the Company had a stranded tax effect of $535 as of the date of enactment. The Company elected to early adopt ASU 2018-02 resulting in a reclassification of $535 from accumulated other comprehensive income to retained earnings in December 2017. The Company recognizes interest and/or penalties related to income tax matters in income tax expense. During 2016 there was $1 paid to the Missouri Department of Revenue. No such interest or penalties were incurred in 2018 or 2017.
Earnings Per Common Share	Earnings Per Common Share
Share-Based Payments	Share-Based Payments Compensation expense associated with restricted stock units is based on the fair value of the units at the grant date. This compensation expense is recognized ratably over the service period stipulated in the grant agreement.
Comprehensive Income	Comprehensive Income
Loss Contingencies	Loss Contingencies
Restrictions on Cash	Restrictions on Cash
Dividend Restriction	Dividend Restriction
Fair Value	Fair Value
Segment Information	Segment Information
Revenue Recognition	Revenue Recognition Revenue from Contracts with Customers The Company adopted ASC 606 using the modified retrospective method applied to all contracts not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018, are presented under ASC 606, while prior period amounts continue to be reported in accordance with legacy GAAP. The adoption of ASC 606 did not result in a change to the accounting for any of the in-scope revenue streams; as such, no cumulative effect adjustment was recorded. Except for gains or losses from the sale of OREO, all of the Company’s revenue from contracts with customers within the scope of ASC 606 is recognized in non-interest income. The following table presents the Company’s sources of non-interest income for the twelve months ended December 31, 2018 and 2017. Non-interest income 2018 2017 Service charges and fees $ 7,250 $ 5,319 Debit card income 6,178 4,547 Mortgage banking (a) 1,298 1,955 Increase in bank-owned life insurance (a) 2,199 1,445 Net gain (loss) from securities transactions (a) (9 ) 271 Other (b) 2,809 1,903 Total non-interest income $ 19,725 $ 15,440 (a) (b) A description of the Company’s revenue streams accounted for under ASC 606 are as follows: Service Charges and Fees: The Company earns fees from its deposit customers for transaction-based, account maintenance and overdraft services. Transaction-based fees, which include services such as stop payment charges, statement rendering and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Company fulfills the customer’s request. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which the Company satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are collected through withdrawal from the customer’s account balance. Debit Card Income: The Company earns debit card income from cardholder transactions conducted through payment processors. Debit card income from cardholder transactions represent a percentage of the underlying transaction value and are recognized concurrently with the transaction processing services provided to the cardholder. Investment Referral Income: Investment referral services are offered through an unaffiliated registered broker-dealer and investment advisor. Investment referral income consists of transaction-based fees (i.e. trade commissions) and account fees (i.e. custodial fees). The service obligation for transaction-based fees relates to processing of individual transactions and is considered earned at the time the transaction occurs. The Company currently records this income when payment is received and at each month end for current-month transactions. Account fees are considered earned over the period for which the fees relate. These fees are received during the first month of each quarter and represent advance payment for the current quarter. These fees are amortized ratably over the three months during the quarter. Therefore, all account-based fees are currently recorded as performance obligations are satisfied. Insurance Sales Commissions: Insurance commissions are received based on contracts with insurance companies which provide for a percentage of premiums to be paid to the Company in exchange for placement of policies with customers. The commissions generally relate to a period of one year or less. Under certain contracts, the Company may also assist with claims processing, but this performance obligation is considered insignificant compared to the initial placement of the policy. As such, the performance obligation is considered to have been substantially satisfied at the time of policy placement. While this indicates that all related revenue would be appropriately accrued at policy inception, in some cases recognition occurs over the policy period if received in installments from the insurance company. In no cases would this deferral extend beyond 12 months and the effect is considered immaterial compared to recognition at the time of policy placement. The Company also receives commission based on renewals of policies previously placed. However, additional work is required to process the renewals, resulting in future performance obligations to earn the related revenues. In addition, the occurrence of such renewals is not certain as initial policies are generally for one year or less and the fees earned are not determined until the time of renewal, based on underwriting at that time. As such, the Company has determined that accrual of income, for future renewals, is not appropriate. Other Non-interest Income: Other non-interest income related to loans and deposits is earned when the specific transaction is processed, similar to service charges and fees. Gain or Loss on Sale of Other Real Estate: Gain or loss on sale of other real estate is reported in non-interest expense and is netted with other real estate expenses. The Company records a gain or loss from the sale of other real estate when control of the property transfers to the buyer, which generally occurs at the time of an executed deed. When the Company finances the sale of other real estate to the buyer, the Company assesses whether the buyer is committed to perform their obligation under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the other real estate is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Company adjusts the transaction price and related gain or loss on sale if a significant financing component is present. As a result, the Company has concluded that ASC 606 will affect the decision to recognize or defer gains on sales of other real estate in circumstances where the Company has financed the sale.
Reclassifications	Reclassifications
Recent Accounting Pronouncements	Recent Accounting Pronouncements: In February 2016, FASB issued ASU 2016-02, Leases, Leases – Targeted In June 2016, FASB issued ASU 2016-13, Financial Instruments – Credit Losses, In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other In March 2017, FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities. In August 2017, FASB issued ASU 2017-12, Derivatives and Hedging, Targeted Improvements to Accounting for Hedging Activities In August 2018, FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.

NATURE OF OPERATIONS AND SUMM_3

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Standards Update 2014-09 [Member]
Summary of Company's Source of Non-interest Income	Except for gains or losses from the sale of OREO, all of the Company’s revenue from contracts with customers within the scope of ASC 606 is recognized in non-interest income. The following table presents the Company’s sources of non-interest income for the twelve months ended December 31, 2018 and 2017. Non-interest income 2018 2017 Service charges and fees $ 7,250 $ 5,319 Debit card income 6,178 4,547 Mortgage banking (a) 1,298 1,955 Increase in bank-owned life insurance (a) 2,199 1,445 Net gain (loss) from securities transactions (a) (9 ) 271 Other (b) 2,809 1,903 Total non-interest income $ 19,725 $ 15,440 (a) (b)

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	12 Months Ended
	Dec. 31, 2018
City Bank and Trust Company [Member]
Business Acquisition [Line Items]
Summary of the Consideration Paid and the Amounts of the Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date	The following table summarizes the consideration paid for City Bank and the amounts of the assets acquired and liabilities assumed recognized at the merger date Fair value of consideration: Cash $ 18,900 $ 18,900 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 27,659 Held-to-maturity securities 44,927 Federal Reserve Bank and Federal Home Loan Bank stock 881 Loans 77,148 Premises and equipment 2,044 Core deposit intangibles 3,360 Other real estate owned 307 Other assets 1,103 Total assets acquired 157,429 Deposits 126,853 Federal Home Loan Bank advances 17,353 Interest payable and other liabilities 147 Total liabilities assumed 144,353 Total identifiable net assets 13,076 Goodwill 5,824 $ 18,900
Schedule Of Acquisitions By Acquisition At Merger	The following table presents the best available information about the loans acquired in the City Bank merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 74,918 $ 5,136 Non-accretable difference (expected losses) — (1,156 ) Cash flows expected to be collected 74,918 3,980 Accretable yield (1,750 ) — Fair value of acquired loans $ 73,168 $ 3,980
Schedule Of Carrying Amounts Of Purchased Loans At Merger	The following table presents the carrying value of the loans acquired in the City Bank merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 17,398 $ 2,592 $ 19,990 Commercial and industrial 8,463 158 8,621 Residential real estate 26,716 798 27,514 Agricultural real estate 5,571 — 5,571 Consumer 8,905 244 9,149 Agricultural 6,115 188 6,303 Fair value of acquired loans $ 73,168 $ 3,980 $ 77,148
Kansas Bank Corporation [Member]
Business Acquisition [Line Items]
Summary of the Consideration Paid and the Amounts of the Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date	The following table summarizes the consideration paid for KBC and the amounts of the assets acquired and liabilities assumed recognized at the merger date Fair value of consideration: Common Stock $ 32,103 Cash 14,918 $ 47,021 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 27,899 Available-for-sale securities 22,820 Held-to-maturity securities 92,028 Federal Reserve Bank and Federal Home Loan Bank stock 475 Loans 159,359 Premises and equipment 5,835 Core deposit intangibles 8,080 Other assets 5,618 Total assets acquired 322,114 Deposits 288,352 Interest payable and other liabilities 751 Total liabilities assumed 289,103 Total identifiable net assets 33,011 Goodwill 14,010 $ 47,021
Schedule Of Acquisitions By Acquisition At Merger	The following table presents the best available information about the loans acquired in the KBC merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 160,526 $ 5,066 Non-accretable difference (expected losses) — (2,305 ) Cash flows expected to be collected 160,526 2,761 Accretable yield (3,928 ) — Fair value of acquired loans $ 156,598 $ 2,761
Schedule Of Carrying Amounts Of Purchased Loans At Merger	The following table presents the carrying value of the loans acquired in the KBC merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 94,492 $ 1,975 $ 96,467 Commercial and industrial 18,848 622 19,470 Residential real estate 2,898 — 2,898 Agricultural real estate 22,425 — 22,425 Consumer 3,539 — 3,539 Agricultural 14,396 164 14,560 Fair value of acquired loans $ 156,598 $ 2,761 $ 159,359
Adams Dairy Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Summary of the Consideration Paid and the Amounts of the Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date	The following table summarizes the consideration paid for Adams and the amounts of the assets acquired and liabilities assumed recognized at the merger date Fair value of consideration: Common stock $ 13,456 Cash 3,960 $ 17,416 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 2,812 Interest bearing time deposits in other banks 4,237 Available-for-sale securities 10,677 Held-to-maturity securities 335 Federal Reserve Bank and Federal Home Loan Bank stock 194 Loans 82,716 Premises and equipment 4,485 Bank-owned life insurance 2,869 Core deposit intangibles 1,990 Other assets 1,042 Total assets acquired 111,357 Deposits 97,124 Federal Home Loan Bank advances 1,000 Interest payable and other liabilities 4,282 Total liabilities assumed 102,406 Total identifiable net assets 8,951 Goodwill 8,465 $ 17,416
Schedule Of Acquisitions By Acquisition At Merger	The following table presents the best available information about the loans acquired in the Adams merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 84,225 $ 1,477 Non-accretable difference (expected losses) — (238 ) Cash flows expected to be collected 84,225 1,239 Accretable yield (2,748 ) — Fair value of acquired loans $ 81,477 $ 1,239
Schedule Of Carrying Amounts Of Purchased Loans At Merger	The following table presents the carrying value of the loans acquired in the Adams merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 74,657 $ 820 $ 75,477 Commercial and industrial 1,002 419 1,421 Residential real estate 4,955 — 4,955 Consumer 863 — 863 Fair value of acquired loans $ 81,477 $ 1,239 $ 82,716
Eastman National Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Summary of the Consideration Paid and the Amounts of the Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date	The following table summarizes the consideration paid for Eastman and the amounts of the assets acquired and liabilities assumed recognized at the merger date Fair value of consideration: Common stock $ 39,109 Cash 8,096 $ 47,205 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 14,698 Available-for-sale securities 59,778 Federal Reserve Bank and Federal Home Loan Bank stock 434 Loans 177,880 Premises and equipment 1,903 Core deposit intangible 4,020 Other real estate owned 41 Interest receivable 998 Other assets 1,047 Total assets acquired 260,799 Deposits 224,111 Federal funds purchased and retail repurchase agreements 8,678 Interest payable and other liabilities 1,548 Total liabilities assumed 234,337 Total identifiable net assets 26,462 Goodwill 20,743 $ 47,205
Schedule Of Acquisitions By Acquisition At Merger	The following table presents the best available information about the loans acquired in the Eastman merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 171,788 $ 12,849 Non-accretable difference (expected losses) — (4,077 ) Cash flows expected to be collected 171,788 8,772 Accretable yield (2,680 ) — Fair value of acquired loans $ 169,108 $ 8,772
Schedule Of Carrying Amounts Of Purchased Loans At Merger	The following table presents the carrying value of the loans acquired in the Eastman merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 71,917 $ 5,326 $ 77,243 Commercial and industrial 36,645 1,545 38,190 Residential real estate 36,846 458 37,304 Agricultural real estate 7,080 33 7,113 Consumer 5,158 — 5,158 Agricultural 11,462 1,410 12,872 Fair value of acquired loans $ 169,108 $ 8,772 $ 177,880
Cache Holdings, Inc. [Member]
Business Acquisition [Line Items]
Summary of the Consideration Paid and the Amounts of the Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date	. The following table summarizes the consideration paid for Cache and the amounts of the assets acquired and liabilities assumed recognized at the acquisition date Fair value of consideration: Common stock $ 39,480 Cash 12,877 $ 52,357 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 10,273 Federal Reserve Bank and Federal Home Loan Bank stock 2,053 Loans held for investment 300,715 Premises and equipment 4,235 Core deposit intangible 1,580 Bank-owned life insurance 3,883 Interest receivable 778 Other assets 1,813 Total assets acquired 325,330 Deposits 278,706 Federal Home Loan Bank advances 9,402 Bank stock loan 1,000 Interest payable and other liabilities 1,948 Total liabilities assumed 291,056 Total identifiable net assets 34,274 Goodwill 18,083 $ 52,357
Schedule Of Acquisitions By Acquisition At Merger	The following table presents the best available information about the loans acquired in the Cache merger as of the date of merger Non-Credit Impaired Purchased Impaired Contractually required principal $ 302,460 $ 2,035 Non-accretable difference (expected losses) — (371 ) Cash flows expected to be collected 302,460 1,664 Accretable yield (3,017 ) (392 ) Fair value of acquired loans $ 299,443 $ 1,272
Schedule Of Carrying Amounts Of Purchased Loans At Merger	The following table presents the carrying value of the loans acquired in the Cache merger by class, as of the date of merger Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 199,151 $ 918 $ 200,069 Commercial and industrial 96,682 354 97,036 Residential real estate 2,027 — 2,027 Agricultural real estate 265 — 265 Consumer 1,318 — 1,318 Fair value of acquired loans $ 299,443 $ 1,272 $ 300,715
Prairie State Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Summary of the Consideration Paid and the Amounts of the Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date	The following table summarizes the consideration paid for Prairie and the amounts of the assets acquired and liabilities assumed recognized at the acquisition date. Fair value of consideration: Common stock $ 15,242 Cash 12,255 $ 27,497 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and due from banks $ 6,579 Available-for-sale securities 3,427 Held-to-maturity securities 971 Federal Reserve Bank and Federal Home Loan Bank stock 198 Loans 129,997 Premises and equipment 2,424 Core deposit intangible 1,448 Other assets 2,331 Total assets acquired 147,375 Deposits 125,353 Interest payable and other liabilities 238 Total liabilities assumed 125,591 Total identifiable net assets 21,784 Goodwill 5,713 $ 27,497
Schedule Of Acquisitions By Acquisition At Merger	The following table presents the best available information about the loans acquired in the Prairie merger as of the date of merger. Non-Credit Impaired Purchased Impaired Contractually required principal $ 123,519 $ 11,430 Non-accretable difference (expected losses) — (2,673 ) Cash flows expected to be collected 123,519 8,757 Accretable yield (2,279 ) — Fair value of acquired loans $ 121,240 $ 8,757
Schedule Of Carrying Amounts Of Purchased Loans At Merger	The following table presents the carrying value of the loans acquired in the Prairie merger by class, as of the date of merger. Non-Credit Impaired Purchased Credit Impaired Total Commercial real estate $ 9,224 $ 144 $ 9,368 Commercial and industrial 11,203 974 12,177 Residential real estate 137 — 137 Agricultural real estate 25,593 2,960 28,553 Consumer 1,451 — 1,451 Agricultural 73,632 4,679 78,311 Fair value of acquired loans $ 121,240 $ 8,757 $ 129,997

SECURITIES (Tables)

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2018
Amortized Cost and Fair Value of Securities Available-for-Sale	The amortized cost and fair value of available-for-sale securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income were as follows Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2018 Available-for-sale securities Residential mortgage-backed securities (issued by government-sponsored entities) $ 173,503 $ 12 $ (4,640 ) $ 168,875 $ 173,503 $ 12 $ (4,640 ) $ 168,875 December 31, 2017 Available-for-sale securities Residential mortgage-backed securities (issued by government-sponsored entities) $ 163,374 $ 36 $ (1,819 ) $ 161,591 State and political subdivisions 195 — — 195 Equity securities 500 — (14 ) 486 $ 164,069 $ 36 $ (1,833 ) $ 162,272
Amortized Cost and Fair Value of Securities Held-to-Maturity	The amortized cost and fair value of held-to-maturity securities and the related gross unrecognized gains and losses were as follows Amortized Cost Gross Unrecognized Gains Gross Unrecognized Losses Fair Value December 31, 2018 Held-to-maturity securities U.S. Government-sponsored entities $ 3,873 $ 7 $ (20 ) $ 3,860 Residential mortgage-backed securities (issued by government sponsored entities) 567,766 2,354 (9,653 ) 560,467 Corporate 22,993 234 (326 ) 22,901 Small Business Administration loan pools 1,746 — (18 ) 1,728 State and political subdivisions 151,978 804 (1,749 ) 151,033 $ 748,356 $ 3,399 $ (11,766 ) $ 739,989 December 31, 2017 Held-to-maturity securities U.S. Government-sponsored entities $ 998 $ — $ (13 ) $ 985 Residential mortgage-backed securities (issued by government sponsored entities) 383,875 573 (4,866 ) 379,582 Corporate 22,991 355 — 23,346 Small Business Administration loan pools 2,048 — (14 ) 2,034 State and political subdivisions 125,550 1,694 (447 ) 126,797 $ 535,462 $ 2,622 $ (5,340 ) $ 532,744
Fair Value and Amortized Cost of Debt Securities by Contractual Maturity	The fair value and amortized cost of debt securities at December 31, 2018, by contractual maturity, is shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value Within one year $ — $ — $ 6,425 $ 6,474 One to five years — — 36,413 36,586 Five to ten years — — 54,205 54,275 After ten years — — 83,547 82,187 Mortgage-backed securities 173,503 168,875 567,766 560,467 Total debt securities $ 173,503 $ 168,875 $ 748,356 $ 739,989
Proceeds from Sales and Associated Gains and Losses Reclassified from Other comprehensive Income to Income	The proceeds from sales and the associated gains and losses on available-for-sale securities reclassified from other comprehensive income to income are listed below. 2018 2017 2016 Proceeds $ — $ 84,087 $ 70,957 Gross gains — 271 893 Gross losses — — — Income tax expense on net realized gains — 103 342
Available for Sale Securities [Member]
Summary of Gross Unrealized Losses and Fair Value of Securities	The following tables show gross unrealized losses and fair value aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2018 and 2017 Less Than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss December 31, 2018 Available-for-sale securities Residential mortgage-backed (issued by government-sponsored entities) $ 48,332 $ (575 ) $ 115,844 $ (4,065 ) $ 164,176 $ (4,640 ) Total temporarily impaired securities $ 48,332 $ (575 ) $ 115,844 $ (4,065 ) $ 164,176 $ (4,640 ) December 31, 2017 Available-for-sale securities Residential mortgage-backed (issued by government-sponsored entities) $ 78,884 $ (437 ) $ 58,540 $ (1,382 ) $ 137,424 $ (1,819 ) Equity securities — — 486 (14 ) 486 (14 ) Total temporarily impaired securities $ 78,884 $ (437 ) $ 59,026 $ (1,396 ) $ 137,910 $ (1,833 )
Held to Maturity Securities [Member]
Summary of Gross Unrealized Losses and Fair Value of Securities	Less Than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss December 31, 2018 Held-to-maturity securities U.S. Government-sponsored entities $ 1,882 $ (3 ) $ 982 $ (17 ) $ 2,864 $ (20 ) Residential mortgage-backed (issued by government-sponsored entities) 31,270 (356 ) 294,127 (10,579 ) 325,397 (10,935 ) Corporate 7,500 (326 ) 5,182 (49 ) 12,682 (375 ) Small Business Administration loan pools — — 1,728 (37 ) 1,728 (37 ) State and political subdivisions 40,415 (473 ) 45,137 (1,561 ) 85,552 (2,034 ) Total temporarily impaired securities $ 81,067 $ (1,158 ) $ 347,156 $ (12,243 ) $ 428,223 $ (13,401 ) December 31, 2017 Held-to-maturity securities U.S. Government-sponsored entities $ — $ — $ 985 $ (13 ) $ 985 $ (13 ) Residential mortgage-backed (issued by government-sponsored entities) 147,281 (1,263 ) 198,239 (5,030 ) 345,520 (6,293 ) Corporate 5,312 (16 ) — — 5,312 (16 ) Small Business Administration loan pools 926 (1 ) 1,108 (38 ) 2,034 (39 ) State and political subdivisions 22,100 (123 ) 26,387 (439 ) 48,487 (562 ) Total temporarily impaired securities $ 175,619 $ (1,403 ) $ 226,719 $ (5,520 ) $ 402,338 $ (6,923 )

LOANS AND ALLOWANCE FOR LOAN _2

LOANS AND ALLOWANCE FOR LOAN LOSSES (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Categories of Loans	The following table lists categories of loans at December 31, 2018 and 2017 2018 2017 Commercial real estate $ 1,251,992 $ 987,661 Commercial and industrial 582,527 521,510 Residential real estate 444,540 376,705 Agricultural real estate 139,332 86,486 Consumer 62,894 49,361 Agricultural 94,123 95,547 Total loans 2,575,408 2,117,270 Allowance for loan losses (11,454 ) (8,498 ) Net loans $ 2,563,954 $ 2,108,772
Schedule of Allowance for Loan Losses by Portfolio Segment Allowance	The following tables present the activity in the allowance for loan losses by class for the years ended December 31, 2018, 2017 and 2016 December 31, 2018 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Beginning balance $ 2,740 $ 2,136 $ 2,262 $ 319 $ 768 $ 273 $ 8,498 Provision for loan losses 1,832 636 97 146 1,188 62 3,961 Loans charged-off (1,779 ) (118 ) (293 ) (93 ) (1,431 ) (43 ) (3,757 ) Recoveries 1,869 53 254 19 545 12 2,752 Total ending allowance balance $ 4,662 $ 2,707 $ 2,320 $ 391 $ 1,070 $ 304 $ 11,454 December 31, 2017 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Beginning balance $ 2,420 $ 1,881 $ 1,765 $ 35 $ 266 $ 65 $ 6,432 Provision for loan losses (69 ) 651 604 287 1,236 244 2,953 Loans charged-off (271 ) (431 ) (350 ) (16 ) (1,025 ) (42 ) (2,135 ) Recoveries 660 35 243 13 291 6 1,248 Total ending allowance balance $ 2,740 $ 2,136 $ 2,262 $ 319 $ 768 $ 273 $ 8,498 December 31, 2016 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Beginning balance $ 2,051 $ 1,366 $ 1,824 $ 29 $ 187 $ 49 $ 5,506 Provision for loan losses 725 700 75 6 567 46 2,119 Loans charged-off (557 ) (226 ) (299 ) (23 ) (584 ) (31 ) (1,720 ) Recoveries 201 41 165 23 96 1 527 Total ending allowance balance $ 2,420 $ 1,881 $ 1,765 $ 35 $ 266 $ 65 $ 6,432
Schedule of Loans Evaluated for Impairment	The following tables present the recorded investment in loans and the balance in the allowance for loan losses by portfolio and class based on impairment method as of December 31, 2018 and 2017 December 31, 2018 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Individually evaluated for impairment $ 242 $ 185 $ 391 $ 22 $ 62 $ 10 $ 912 Collectively evaluated for impairment 3,695 2,493 1,861 367 925 293 9,634 Purchased credit impaired loans 725 29 68 2 83 1 908 Total $ 4,662 $ 2,707 $ 2,320 $ 391 $ 1,070 $ 304 $ 11,454 Loan Balance: Individually evaluated for impairment $ 23,323 $ 5,020 $ 4,434 $ 856 $ 678 $ 2,252 $ 36,563 Collectively evaluated for impairment 1,215,173 571,171 437,219 133,415 61,978 89,194 2,508,150 Purchased credit impaired loans 13,496 6,336 2,887 5,061 238 2,677 30,695 Total $ 1,251,992 $ 582,527 $ 444,540 $ 139,332 $ 62,894 $ 94,123 $ 2,575,408 December 31, 2017 Commercial Real Estate Commercial and Industrial Residential Real Estate Agricultural Real Estate Consumer Agricultural Total Allowance for loan losses: Individually evaluated for impairment $ 130 $ 87 $ 386 $ 46 $ 56 $ 36 $ 741 Collectively evaluated for impairment 2,582 2,028 1,815 190 712 236 7,563 Purchased credit impaired loans 28 21 61 83 — 1 194 Total $ 2,740 $ 2,136 $ 2,262 $ 319 $ 768 $ 273 $ 8,498 Loan Balance: Individually evaluated for impairment $ 2,728 $ 7,886 $ 4,829 $ 533 $ 556 $ 1,050 $ 17,582 Collectively evaluated for impairment 971,376 507,894 369,471 82,493 48,802 90,795 2,070,831 Purchased credit impaired loans 13,557 5,730 2,405 3,460 3 3,702 28,857 Total $ 987,661 $ 521,510 $ 376,705 $ 86,486 $ 49,361 $ 95,547 $ 2,117,270
Impaired Loans, Segregated by Class of Loans	The following table presents information related to impaired loans, excluding those purchased credit impaired loans which have not deteriorated since acquisition, by class of loans as of and for the year ended December 31, 2018 December 31, 2018 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial real estate $ 20,940 $ 20,902 $ — $ 5,652 $ 150 Commercial and industrial 3,446 3,396 — 5,629 66 Residential real estate 533 527 — 744 20 Agricultural real estate 2,038 2,035 — 1,364 18 Consumer 61 55 — 32 2 Agricultural 756 756 — 411 18 Subtotal 27,774 27,671 — 13,832 274 With an allowance recorded: Commercial real estate 8,700 7,179 967 2,913 142 Commercial and industrial 2,255 1,911 214 1,068 53 Residential real estate 4,934 4,582 459 4,188 74 Agricultural real estate 261 242 24 429 2 Consumer 1,144 859 145 568 33 Agricultural 162 106 11 418 4 Subtotal 17,456 14,879 1,820 9,584 308 Total $ 45,230 $ 42,550 $ 1,820 $ 23,416 $ 582 The above table presents interest income for the twelve months ended December 31, 2018. Interest income recognized in the above table was substantially recognized on the cash basis. The recorded investment in loans excludes accrued interest receivable due to immateriality. The following table presents information related to impaired loans, excluding purchased credit impaired loans which have not deteriorated since acquisition, by portfolio and class of loans as of and for the year ended December 31, 2017. December 31, 2017 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial real estate $ 1,878 $ 1,567 $ — $ 1,426 $ 267 Commercial and industrial 8,679 8,020 — 4,572 252 Residential real estate 1,230 969 — 587 29 Agricultural real estate 52 52 — 270 12 Consumer 1 — — — 1 Agricultural 7 7 — 83 73 Subtotal 11,847 10,615 — 6,938 634 With an allowance recorded: Commercial real estate 4,049 1,597 158 1,813 16 Commercial and industrial 1,310 1,113 108 663 51 Residential real estate 4,868 4,468 447 3,916 95 Agricultural real estate 1,266 1,034 129 527 16 Consumer 677 559 56 448 15 Agricultural 1,798 1,444 37 469 2 Subtotal 13,968 10,215 935 7,836 195 Total $ 25,815 $ 20,830 $ 935 $ 14,774 $ 829
Schedule of Aging of Recorded Investment in Past Due Loans by Segment and Class of Loans	The following tables present the aging of the recorded investment in past due loans as of December 31, 2018 and 2017, by portfolio and class of loans December 31, 2018 30 – 59 Days Past Due 60 – 89 Days Past Due Greater 90 Days Past Due Still On Accrual Nonaccrual Loans Not Past Due Total Commercial real estate $ 1,302 $ 259 $ — $ 12,768 $ 1,237,663 $ 1,251,992 Commercial and industrial 509 2,467 — 6,954 572,597 582,527 Residential real estate 782 2,188 18 5,257 436,295 444,540 Agricultural real estate — 30 — 4,857 134,445 139,332 Consumer 501 157 — 914 61,322 62,894 Agricultural 186 3 — 2,453 91,481 94,123 Total $ 3,280 $ 5,104 $ 18 $ 33,203 $ 2,533,803 $ 2,575,408 December 31, 2017 30 – 59 Days Past Due 60 – 89 Days Past Due Greater 90 Days Past Due Still On Accrual Nonaccrual Loans Not Past Due Total Commercial real estate $ 1,284 $ 22 $ — $ 11,607 $ 974,748 $ 987,661 Commercial and industrial 251 6 — 13,217 508,036 521,510 Residential real estate 1,457 1,176 — 6,148 367,924 376,705 Agricultural real estate 123 — — 3,993 82,370 86,486 Consumer 359 112 — 559 48,331 49,361 Agricultural 415 — — 4,752 90,380 95,547 Total $ 3,889 $ 1,316 $ — $ 40,276 $ 2,071,789 2,117,270
Summary of Risk Category of Loans by Class of Loans	The risk category of loans by class of loans is as follows as of December 31, 2018 and 2017 December 31, 2018 Unclassified Classified Total Commercial real estate $ 1,215,015 $ 36,977 $ 1,251,992 Commercial and industrial 553,045 29,482 582,527 Residential real estate 439,184 5,356 444,540 Agricultural real estate 129,285 10,047 139,332 Consumer 61,976 918 62,894 Agricultural 90,848 3,275 94,123 Total $ 2,489,353 $ 86,055 2,575,408 December 31, 2017 Unclassified Classified Total Commercial real estate $ 971,458 $ 16,203 $ 987,661 Commercial and industrial 500,141 21,369 521,510 Residential real estate 370,151 6,554 376,705 Agricultural real estate 77,084 9,402 86,486 Consumer 48,777 584 49,361 Agricultural 88,261 7,286 95,547 Total $ 2,055,872 $ 61,398 2,117,270
Schedule of Recorded Investments in Purchased Credit Impaired Loans	. The recorded investments in purchased credit impaired loans as of December 31, 2018, 2017 and 2016 were as follows 2018 2017 2016 Contractually required principal payments $ 40,772 $ 41,349 $ 27,413 Discount (10,077 ) (12,492 ) (8,914 ) Recorded investment $ 30,695 $ 28,857 $ 18,499

OTHER REAL ESTATE OWNED (Tables

OTHER REAL ESTATE OWNED (Tables)	12 Months Ended
	Dec. 31, 2018
Banking And Thrift [Abstract]
Schedule for Changes in Other Real Estate Owned	Changes in other real estate owned for the years ended December 31, 2018 and 2017 were as follows. 2018 2017 Beginning of year $ 7,907 $ 8,656 Transfers in 3,228 4,562 Acquired in acquisition 307 41 Net (loss) gain on sales (75 ) 121 Proceeds from sales (4,730 ) (5,461 ) 6,637 7,919 Additions to valuation reserve (265 ) (12 ) Recorded investment $ 6,372 $ 7,907
Summary of Other Real Estate Owned Expense	Expenses related to other real estate owned for the years ended December 31, 2018, 2017 and 2016 were as follows. 2018 2017 2016 Net loss (gain) on sales $ 75 $ (121 ) $ (156 ) Gain on initial valuation of other real estate properties received (920 ) — — Provision for unrealized losses 265 12 44 Operating expenses, net of rental income 509 632 498 $ (71 ) $ 523 $ 386

PREMISES AND EQUIPMENT (Tables)

PREMISES AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Schedule of Premises and Equipment	Major classifications of premises and equipment, stated at cost, are as follows. 2018 2017 Land $ 16,988 $ 13,842 Buildings and improvements 62,116 51,703 Furniture, fixtures and equipment 17,217 11,620 96,321 77,165 Less: accumulated depreciation (15,879 ) (13,716 ) Premises and equipment, net $ 80,442 $ 63,449
Schedule Of Future Minimum Operating Lease Payments	The Company leases certain branch properties under operating leases. Rent expense was $695, $691 and $554 for 2018, 2017 and 2016. Rent commitments at December 31, 2018, before considering renewal options that generally are present, were as follows. Due in one year or less $ 655 Due after one year through two years 585 Due after two years through three years 362 Due after three years through four years 352 Due after four years through five years 303 Thereafter 1,911 Total $ 4,168

GOODWILL AND CORE DEPOSIT INT_2

GOODWILL AND CORE DEPOSIT INTANGIBLES (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The carrying basis of goodwill and core deposit intangibles as of and for the years ended December 31, 2018 and 2017 were as follows. Goodwill Core Deposit Balance as of January 1, 2017 $ 58,874 $ 4,715 Acquired in acquisition 46,033 7,048 Amortization — (1,025 ) Balance as of December 31, 2017 104,907 10,738 Acquired in acquisition 26,805 13,430 Amortization — (2,443 ) Balance as of December 31, 2018 $ 131,712 $ 21,725
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated amortization expense for each of the following five years and thereafter is listed in the following table. Expensed in one year or less $ 2,949 Expensed after one year through two years 2,822 Expensed after two years through three years 2,759 Expensed after three years through four years 2,696 Expensed after four years through five years 2,637 Thereafter 7,862 Total $ 21,725

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Notional Balance and Fair Values of Derivatives Outstanding	The following table shows the notional balances and fair values (including net accrued interest) of the derivatives outstanding by derivative type at December 31, 2018 and December 31, 2017 December 31, 2018 December 31, 2017 Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate swaps $ 16,743 $ 242 $ — $ 17,231 $ — $ 46 Total derivatives designated as hedging relationships 16,743 242 — 17,231 — 46 Derivatives not designated as hedging instruments: Interest rate swaps 38,073 690 777 — — — Interest rate caps/floors 2,264 1 — 2,574 1 — Total derivatives not designated as hedging instruments 40,337 691 777 2,574 1 — Total $ 57,080 933 777 $ 19,805 1 46 Cash collateral (531 ) (541 ) — (210 ) Netting adjustments 289 289 164 164 Net amount presented in balance sheet $ 691 $ 525 $ 165 $ —
Summary of Net Gains or Losses on Derivatives and Hedging Activities	The following table shows net gains or losses on derivatives and hedging activities for the years ended December 31, 2018, 2017 and 2016 2018 2017 2016 Derivatives designated as hedging instruments: Interest rate swaps $ — $ — $ — Total net gain (loss) related to fair value hedge ineffectiveness — — — Derivatives not designated as hedging instruments: Economic hedges: Interest rate swaps 202 — — Interest rate caps/floors — (1 ) (1 ) Total net gains (losses) related to derivatives not designated as hedging instruments 202 (1 ) (1 ) Net gains (losses) on derivatives and hedging activities $ 202 $ (1 ) $ (1 )
Summary of Recorded Net Gains or Losses on Derivatives and Related Hedged Items in Fair Value Hedging Relationships	The following table shows the recorded net gains or losses on derivatives and the related hedged items in fair value hedging relationships and the impact of those derivatives on the Company’s net interest income for the years ended December 31, 2018, 2017 and 2016 December 31, 2018 Gain/(Loss) on Derivatives Gain/(Loss) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect of Derivatives on Net Interest Income Commercial real estate loans $ 283 $ (283 ) $ — $ (40 ) Total $ 283 $ (283 ) $ — $ (40 ) December 31, 2017 Gain/(Loss) on Derivatives Gain/(Loss) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect of Derivatives on Net Interest Income Commercial real estate loans $ 12 $ (12 ) $ — $ (137 ) Total $ 12 $ (12 ) $ — $ (137 ) December 31, 2016 Gain/(Loss) on Derivatives Gain/(Loss) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect of Derivatives on Net Interest Income Commercial real estate loans $ 211 $ (211 ) $ — $ (199 ) Total $ 211 $ (211 ) $ — $ (199 )

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2018
Banking And Thrift [Abstract]
Summary of Scheduled Maturities of Time Deposits	At December 31, 2018, the scheduled maturities of time deposits are as follows. Due in one year or less $ 673,838 Due after one year through two years 209,695 Due after two years through three years 44,784 Due after three years through four years 63,810 Due after four years through five years 14,720 Thereafter 1,059 Total $ 1,007,906

BORROWINGS (Tables)

BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Federal Funds Purchased and Retail Repurchase Agreements	Federal funds purchased and retail repurchase agreements included the following at December 31, 2018 and 2017. 2018 2017 Federal funds purchased $ — $ — Retail repurchase agreements $ 50,068 $ 37,492
Average Daily Balance and Interest Rate of Federal Funds Purchased and Retail Repurchase Agreements	The following table presents the borrowing usage and interest rate information for federal funds purchased and retail repurchase agreements at and for the years ended December 31, 2018 and 2017. 2018 2017 Average daily balance during the period $ 43,536 $ 25,823 Average interest rate during the period 0.26 % 0.25 % Maximum month-end balance during the period $ 53,815 $ 43,843 Weighted average interest rate at period-end 0.28 % 0.23 %
Summary of Federal Home Loan Bank Advances	Federal Home Loan Bank advances as of December 31, 2018 and 2017 were as follows. 2018 2017 Federal Home Loan Bank line of credit advances $ 368,770 $ 347,692 Federal Home Loan Bank fixed rate term advances 16,049 — Total principal outstanding 384,819 347,692 Federal Home Loan Bank fixed rate term advances, fair market value adjustments 79 — Total Federal Home Loan Bank advances $ 384,898 $ 347,692
Schedule of Bank Stock Loan Advances	Bank stock loan advances as of December 31, 2018 and 2017 are listed below. December 31, 2018 Outstanding Balance Weighted Average Rate Bank stock loan $ 15,450 5.50 % December 31, 2017 Outstanding Balance Weighted Average Rate Bank stock loan $ 2,500 4.50 %
Federal Home Loan Bank Advances [Member]
Summary of Future Principal Repayments	Future principal repayments of the December 31, 2018 outstanding balances are as follows. Due in one year or less $ 371,724 Due after one year through two years 2,988 Due after two years through three years 2,357 Due after three years through four years 2,357 Due after four years through five years 2,357 Thereafter 3,036 Total $ 384,819
Bank Stock Loan [Member]
Summary of Future Principal Repayments	Future principal repayments of the December 31, 2018 outstanding balances are as follows. Due in one year or less $ 1,850 Due after one year through two years 1,600 Due after two years through three years 1,600 Due after three years through four years 1,600 Due after four years through five years 8,800 Thereafter — Total $ 15,450

SUBORDINATED DEBENTURES (Tables

SUBORDINATED DEBENTURES (Tables)	12 Months Ended
	Dec. 31, 2018
Brokers And Dealers [Abstract]
Summary of Contractual Balance and Unamortized Fair Value Adjustments	At December 31, 2018 and 2017, the contractual balance and the unamortized fair value adjustments were as shown below. 2018 2017 Contractual balance $ 20,620 $ 20,620 Unamortized fair value adjustment (6,360 ) (6,652 ) Net book value $ 14,260 $ 13,968

STOCKHOLDERS' EQUITY (Tables)

STOCKHOLDERS' EQUITY (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Summary of Shares Issued and Held in Treasury or Outstanding	At December 31, 2018 and 2017, the following table presents shares that were issued and were held in treasury or were outstanding. 2018 2017 Class A common stock – issued 17,244,138 15,876,650 Class A common stock – held in treasury (1,271,043 ) (1,271,043 ) Class A common stock – outstanding 15,973,095 14,605,607 Class B common stock – issued 234,903 234,903 Class B common stock – held in treasury (234,903 ) (234,903 ) Class B common stock – outstanding — —
Components of Accumulated Other Comprehensive Income	Components of accumulated other comprehensive income as of December 31, 2018 and 2017 were as follows. Available -for-Sale Securities Held-to -Maturity Securities Accumulated Other Comprehensive Income December 31, 2018 Net unrealized or unamortized gains (losses) $ (4,628 ) $ (1,891 ) $ (6,519 ) Tax effect 1,173 479 1,652 $ (3,455 ) $ (1,412 ) $ (4,867 ) December 31, 2017 Net unrealized or unamortized gains (losses) $ (1,797 ) $ (2,344 ) $ (4,141 ) Tax effect 455 594 1,049 $ (1,342 ) $ (1,750 ) $ (3,092 )

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense	Income tax expense is listed in the following table. 2018 2017 2016 Current income tax expense Federal $ 4,655 $ 6,474 $ 2,863 State 2,212 1,282 723 Total current income tax expense 6,867 7,756 3,586 Deferred income tax expense Federal 2,933 2,550 865 State 550 71 44 Total deferred income tax expense 3,483 2,621 909 Total income tax expense $ 10,350 $ 10,377 $ 4,495
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of income tax expense at the U.S. federal statutory rate (21% in 2018; 35% in 2017and 2016) to the Company’s actual income tax expense is shown below. 2018 2017 2016 Computed at the statutory rate $ 9,697 $ 10,862 $ 4,854 Increase (decrease) resulting from: State and local taxes, net of federal benefit 1,962 717 449 Tax-exempt interest (844 ) (1,177 ) (576 ) Non-taxable life insurance income (462 ) (506 ) (350 ) Non-deductible expenses 530 376 689 Share-based payments (23 ) (335 ) — Federal tax credits (568 ) (660 ) (625 ) Change in valuation allowance 336 187 65 Effect of tax reform — 1,086 — Other (278 ) (173 ) (11 ) Income tax expense $ 10,350 $ 10,377 $ 4,495
Components of Deferred Tax Assets and Liabilities	Components of deferred tax assets and liabilities are shown in the table below. 2018 2017 Deferred tax assets Allowance for loan losses $ 2,880 $ 2,121 Net unrealized or unamortized losses on securities 1,639 1,034 Tax credit carryforwards 974 974 Accrued compensation 1,675 1,208 Net operating loss carryforwards 1,003 797 Other real estate owned 656 588 Acquired loans fair market value adjustments 4,058 4,532 Other 1,072 404 Gross deferred tax assets 13,957 11,658 Deferred tax liabilities Assumed debt fair market value adjustments 1,537 1,607 Goodwill amortization 1,492 1,267 Depreciation 3,288 1,831 Federal Home Loan Bank stock dividends 1,123 764 Core deposit intangibles 4,293 2,301 Other 283 360 Gross deferred tax liabilities 12,016 8,130 State valuation allowance (908 ) (571 ) Net deferred tax asset $ 1,033 $ 2,957

REGULATORY MATTERS (Tables)

REGULATORY MATTERS (Tables)	12 Months Ended
	Dec. 31, 2018
Banking And Thrift [Abstract]
Summary of Company's and Equity Bank's Capital Amounts and Ratios	The Company’s and Equity Bank’s capital amounts and ratios at December 31, 2018 and 2017 are presented in the tables below. Ratios provided for Equity Bancshares, Inc. represent the ratios of the Company on a consolidated basis. Actual Minimum Required for Capital Adequacy Under Basel III Phase-In Minimum Required for Capital Adequacy Under Basel III Fully Phased-In To Be Well Capitalized Under Prompt Corrective Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2018 Total capital to risk weighted assets Equity Bancshares, Inc. $ 337,649 11.92 % $ 279,621 9.88 % $ 297,319 10.50 % $ N/A N/A Equity Bank 338,180 11.96 % 279,244 9.88 % 296,918 10.50 % 282,779 10.00 % Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 326,195 11.52 % 222,989 7.88 % 240,687 8.50 % N/A N/A Equity Bank 326,726 11.55 % 222,688 7.88 % 240,362 8.50 % 226,223 8.00 % Common equity Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 311,935 11.02 % 180,515 6.38 % 198,213 7.00 % N/A N/A Equity Bank 326,726 11.55 % 180,271 6.38 % 197,945 7.00 % 183,806 6.50 % Tier 1 leverage to average assets Equity Bancshares, Inc. 326,195 8.60 % 151,731 4.00 % 151,731 4.00 % N/A N/A Equity Bank 326,726 8.62 % 151,590 4.00 % 151,590 4.00 % 189,488 5.00 % Actual Minimum Required for Capital Adequacy Under Basel III Phase-In Minimum Required for Capital Adequacy Under Basel III Fully Phased-In To Be Well Capitalized Under Prompt Corrective Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2017 Total capital to risk weighted assets Equity Bancshares, Inc. $ 288,353 12.54 % $ 212,705 9.25 % $ 241,449 10.50 % $ N/A N/A Equity Bank 279,712 12.17 % 212,682 9.25 % 241,423 10.50 % 229,927 10.00 % Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 279,855 12.17 % 166,715 7.25 % 195,459 8.50 % N/A N/A Equity Bank 271,214 11.80 % 166,697 7.25 % 195,438 8.50 % 183,942 8.00 % Common equity Tier 1 capital to risk weighted assets Equity Bancshares, Inc. 265,887 11.56 % 132,222 5.75 % 160,966 7.00 % N/A N/A Equity Bank 271,214 11.80 % 132,208 5.75 % 160,949 7.00 % 149,452 6.50 % Tier 1 leverage to average assets Equity Bancshares, Inc. 279,855 10.33 % 108,372 4.00 % 108,372 4.00 % N/A N/A Equity Bank 271,214 10.01 % 108,351 4.00 % 108,351 4.00 % 135,439 5.00 %

RELATED-PARTY TRANSACTIONS (Tab

RELATED-PARTY TRANSACTIONS (Tables)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Changes in Loans Outstanding to Related Parties	At December 31, 2018 and 2017, the Company had loans outstanding to executive officers, directors, significant stockholders, and their affiliates (related parties), in the amount of $2,267 and $3,892. Changes during 2018 are listed below. 2018 Balance at January 1, 2018 $ 3,892 New loans/advances 1,803 Repayments (3,428 ) Balance at December 31, 2018 $ 2,267

EMPLOYEE BENEFITS (Tables)

EMPLOYEE BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Schedule of Net Pension Cost and Funded Status	The following table presents the net pension cost and funded status of the Company relating to the Pentegra Defined Benefit Plan since the date of acquisition (dollar amounts in thousands). 2018 2017 Net pension cost charged to salaries and employee benefits $ 113 $ 84 Pentegra defined benefit plan funded status as of July 1 109.86 % 110.37 % Plan's funded status as of July 1 94.30 % 96.89 % Contributions paid to the plan $ 93 $ 65

SHARE-BASED PAYMENTS (Tables)

SHARE-BASED PAYMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity	The following tables summarize stock option activity for the years ended December 31, 2018 and 2017. December 31, 2018 Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Outstanding at beginning of year 797,521 $ 22.54 8 $ 10,261 Granted 99,935 34.69 10 — Exercised (6,800 ) (19.49 ) (8 ) — Forfeited or expired (38,100 ) (31.97 ) (10 ) — Outstanding at end of year 852,556 $ 23.57 7 $ 10,044 Fully vested and expected to vest 852,556 $ 23.57 7 $ 10,044 Exercisable at end of year 565,847 $ 19.44 4 $ 8,995 December 31, 2017 Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Outstanding at beginning of year 590,835 $ 16.69 7 $ 10,017 Granted 305,404 33.05 10 — Exercised (71,434 ) (17.01 ) (3 ) — Forfeited or expired (27,284 ) (27.72 ) (10 ) — Outstanding at end of year 797,521 $ 22.54 8 $ 10,261 Fully vested and expected to vest 797,521 $ 22.54 8 $ 10,261 Exercisable at end of year 484,728 $ 17.48 7 $ 8,692
Schedule of Fair Values of Options Granted	The fair values of options granted were determined using the following weighted-average assumptions as of grant dates. 2018 2017 2016 Risk free rate 2.45 % 2.20 % 1.58 % Market value of stock on grant date $ 34.69 $ 33.05 $ 25.44 Expected term (in years) 6.3 6.7 5.0 Expected volatility 19.71 % 19.66 % 19.08 % Dividend rate — % — % — %
Summary of Changes in Company's Non-vested RSUs	A summary of changes in the Company’s non-vested RSUs for the year is shown below. Non-vested Restricted Stock Units Shares Weighted Average Grant Date Fair Value Non-vested RSUs at January 1, 2018 4,890 $ 33.50 Granted 145,288 36.89 Vested (14,401 ) (36.55 ) Forfeited (3,670 ) (37.57 ) Outstanding at end of year 132,107 $ 36.78

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Summary of Earnings Per Share	Earnings per share were computed as shown below. 2018 2017 2016 Basic: Net income allocable to common stockholders $ 35,825 $ 20,649 $ 9,373 Weighted average common shares outstanding 15,389,513 12,446,851 8,624,108 Weighted average vested restricted stock units 4,403 1,751 — Weighted average shares 15,393,916 12,448,602 8,624,108 Basic earnings per common share $ 2.33 $ 1.66 $ 1.09 Diluted: Net income allocable to common stockholders $ 35,825 $ 20,649 $ 9,373 Weighted average common shares outstanding for: Basic earnings per common share 15,393,916 12,448,602 8,624,108 Dilutive effects of the assumed exercise of stock options 293,588 255,947 131,418 Dilutive effects of the assumed redemption of RSUs 20,882 2,635 — Average shares and dilutive potential common shares 15,708,386 12,707,184 8,755,526 Diluted earnings per common share $ 2.28 $ 1.62 $ 1.07

FAIR VALUE (Tables)

FAIR VALUE (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized below. December 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Available-for-sale securities: Residential mortgage-backed securities (issued by government-sponsored entities) $ — $ 168,875 $ — Derivative assets: Derivative assets (included in other assets) — 933 — Cash collateral held by counterparty and netting adjustments (242 ) — — Total derivative assets (242 ) 933 — Other assets: Equity securities with readily determinable fair value 475 — — Total other assets 475 — — Total assets 233 169,808 — Liabilities: Derivative liabilities: Derivative liabilities (included in other liabilities) — 777 — Cash collateral held by counterparty and netting adjustments (252 ) — — Total derivative liabilities (252 ) 777 — Total liabilities (252 ) 777 — December 31, 2017 (Level 1) (Level 2) (Level 3) Assets: Available-for-sale securities: Residential mortgage-backed securities (issued by government-sponsored entities) $ — $ 161,591 $ — State and political subdivisions — 195 — Equity securities 486 — — Derivative assets: Derivative assets (included in other assets) — 1 — Cash collateral held by counterparty and netting adjustments 164 — — Total derivative assets 164 1 — Total assets 650 161,787 — Liabilities: Derivative liabilities: Derivative liabilities (included in other liabilities) — 46 — Cash collateral held by counterparty and netting adjustments (46 ) — — Total derivative liabilities (46 ) 46 — Total liabilities (46 ) 46 —
Summary of Assets Measured at Fair Value on Non-recurring Basis	Assets measured at fair value on a non-recurring basis are summarized below. December 31, 2018 (Level 1) (Level 2) (Level 3) Impaired loans: Commercial real estate $ — $ — $ 6,212 Commercial and industrial — — 1,697 Residential real estate — — 4,123 Agricultural real estate — — 218 Other — — 809 Other real estate owned: Commercial real estate — — 1,391 Residential real estate — — 97 December 31, 2017 (Level 1) (Level 2) (Level 3) Impaired loans: Commercial real estate $ — $ — $ 1,439 Commercial and industrial — — 1,005 Residential real estate — — 4,021 Agricultural real estate — — 905 Other — — 1,910 Other real estate owned: Commercial real estate — — 1,018 Residential real estate — — 157
Summary of Additional Information about Unobservable Inputs Used in Fair Value Measurement	The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized with Level 3 of the fair value hierarchy. Fair Value Valuation Technique Unobservable Input Range (weighted average) December 31, 2018 Impaired loans $ 13,059 Sales Comparison Approach Adjustments for differences between comparable sales 4% - 22% (13%) December 31, 2017 Impaired loans $ 9,280 Sales Comparison Approach Adjustments for differences between comparable sales 15% - 26% (5%)
Carrying Amounts and Estimated Fair Values of Financial Instrument	Carrying amounts and estimated fair values of financial instruments at year end were as follows as of the date indicated. December 31, 2018 Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 192,818 $ 192,818 $ 192,818 $ — $ — Interest-bearing deposits 4,991 4,991 — 4,991 — Available-for-sale securities 168,875 168,875 — 168,875 — Held-to-maturity securities 748,356 739,989 — 739,989 — Loans held for sale 2,972 2,972 — 2,972 — Loans, net of allowance for loan losses 2,563,954 2,565,526 — — 2,565,526 Federal Reserve Bank and Federal Home Loan Bank stock 29,214 N/A N/A N/A N/A Interest receivable 17,372 17,372 — 17,372 — Derivative assets 933 933 — 933 — Cash collateral held by derivative counterparty (242 ) (242 ) (242 ) — — Total derivative assets 691 691 (242 ) 933 — Total assets $ 3,729,243 $ 3,693,234 $ 192,576 $ 935,132 $ 2,565,526 Financial liabilities: Deposits $ 3,123,447 $ 3,124,654 $ — $ 3,124,654 $ — Federal funds purchased and retail repurchase agreements 50,068 50,068 — 50,068 — Federal Home Loan Bank advances 384,898 384,898 — 384,898 — Bank stock loan 15,450 15,450 — 15,450 — Subordinated debentures 14,260 14,260 — 14,260 — Contractual obligations 3,965 3,965 — 3,965 — Interest payable 3,648 3,648 — 3,648 — Derivative liabilities 777 777 — 777 — Cash collateral held by derivative counterparty (252 ) (252 ) (252 ) — — Total derivative liabilities 525 525 (252 ) 777 — Total liabilities $ 3,596,261 $ 3,597,468 $ (252 ) $ 3,597,720 $ — December 31, 2017 Carrying Amount Estimated Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and cash equivalents $ 52,195 $ 52,195 $ 52,195 $ — $ — Interest-bearing deposits 3,496 3,496 — 3,496 — Available-for-sale securities 162,272 162,272 486 161,786 — Held-to-maturity securities 535,462 532,744 — 532,744 — Loans held for sale 2,353 2,353 — 2,353 — Loans, net of allowance for loan losses 2,108,772 2,112,422 — — 2,112,422 Federal Reserve Bank and Federal Home Loan Bank stock 24,373 N/A N/A N/A N/A Interest receivable 12,371 12,371 — 12,371 — Derivative assets 1 1 — 1 — Cash collateral held by derivative counterparty 164 164 164 — — Total derivative assets 165 165 164 1 — Total assets $ 2,901,459 $ 2,878,018 $ 52,845 $ 712,751 $ 2,112,422 Financial liabilities: Deposits $ 2,382,013 $ 2,385,528 $ — $ 2,385,528 $ — Federal funds purchased and retail repurchase agreements 37,492 37,492 — 37,492 — Federal Home Loan Bank advances 347,692 347,692 — 347,692 — Bank stock loan 2,500 2,500 — 2,500 — Subordinated debentures 13,968 13,968 — 13,968 — Contractual obligations 1,967 1,967 — 1,967 — Interest payable 1,932 1,932 — 1,932 — Derivative liabilities 46 46 — 46 — Cash collateral held by derivative counterparty (46 ) (46 ) (46 ) — — Total derivative liabilities — — (46 ) 46 — Total liabilities $ 2,787,564 $ 2,791,079 $ (46 ) $ 2,791,125 $ —

COMMITMENTS AND CREDIT RISK (Ta

COMMITMENTS AND CREDIT RISK (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Summary of Contractual Amounts of Commitments and Standby Letters of Credit to Originate Loans and Available Lines of Credit	The contractual amounts of commitments to originate loans and available lines of credit as of December 31, 2018 and 2017 were as as follows. December 31, 2018 December 31, 2017 Fixed Rate Variable Rate Fixed Rate Variable Rate Commitments to make loans $ 29,543 $ 171,857 $ 38,031 $ 67,107 Mortgage loans in the process of origination 6,785 2,860 14,803 9,258 Unused lines of credit 92,225 167,218 87,948 141,026 December 31, 2018 December 31, 2017 Fixed Rate Variable Rate Fixed Rate Variable Rate Standby letters of credit $ 4,474 $ 2,716 $ 4,064 $ 3,830

CONDENSED FINANCIAL INFORMATI_2

CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY) (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	CONDENSED BALANCE SHEET 2018 2017 ASSETS Cash and due from banks $ 1,540 $ 4,201 Investment in Equity Bank 470,902 379,933 Investment in EBAC 3,262 — Other assets 10,490 6,762 Total assets $ 486,194 $ 390,896 LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities $ 30,253 $ 16,752 Stockholders’ equity 455,941 374,144 Total liabilities and stockholders’ equity $ 486,194 $ 390,896
Condensed Statement of Income	CONDENSED STATEMENT OF INCOME 2018 2017 2016 Dividends from Equity Bank $ 30,500 $ 17,250 $ 9,500 Other income 3 26 1 Total income 30,503 17,276 9,501 Expenses Interest expense 1,918 996 701 Other expenses 3,358 3,018 2,408 Total expenses 5,276 4,014 3,109 Income (loss) before income tax and equity in undistributed income of subsidiaries 25,227 13,262 6,392 Income tax benefit 1,025 2,017 859 Income (loss) before equity in undistributed income (loss) of subsidiaries 26,252 15,279 7,251 Equity in undistributed income (loss) of Equity Bank 9,681 5,370 2,123 Equity in undistributed income (loss) of EBAC (108 ) — — Net income 35,825 20,649 9,374 Dividends and discount accretion on preferred stock — — (1 ) Net income allocable to common stockholders $ 35,825 $ 20,649 $ 9,373
Condensed Statement of Cash Flows	CONDENSED STATEMENT OF CASH FLOWS 2018 2017 2016 Cash flows from operating activities Net income $ 35,825 $ 20,649 $ 9,374 Adjustments to reconcile net income to net cash from operating activities: Stock based compensation 2,509 1,100 553 Equity in undistributed (income) loss of Equity Bank (9,681 ) (5,370 ) (2,123 ) Equity in undistributed (income) loss of EBAC 108 — — Net amortization of purchase valuation adjustments 292 284 246 Net change in: Other assets (4,092 ) (1,331 ) (1,529 ) Interest payable and other liabilities (50 ) (1,419 ) (409 ) Net cash from (to) operating activities 24,911 13,913 6,112 Cash flows (to) from investing activities Proceeds from sale of other real estate owned — 267 — Purchase stock of Community First, net of holding company cash acquired — — (9,549 ) Purchase stock of Prairie, net of holding company cash acquired — (12,510 ) — Purchase stock of Eastman, net of holding company cash acquired (55 ) (7,813 ) — Purchase stock of Cache, net of holding company cash acquired — (13,103 ) — Purchase stock of KBC, net of holding company cash acquired (14,151 ) — — Purchase stock of Adams, net of holding company cash acquired (4,179 ) — — Purchase assets of City Bank, net of liabilities assumed (18,900 ) Purchase of net assets of EBAC (3,370 ) — — Net cash (used in) investing activities (40,655 ) (33,159 ) (9,549 ) Cash flows (to) from financing activities Borrowings on bank stock loan 22,500 2,500 6,000 Principal payments on bank stock loan (9,550 ) (1,000 ) (33,218 ) Proceeds from the issuance of common stock, net — — 23,643 Proceeds from exercise of employee stock options 133 1,215 112 Principal payments on employee stock loan — 121 — Redemption of Series C preferred stock — — (16,372 ) Dividends paid on preferred stock — — (42 ) Excess tax benefits recognized on exercise of employee stock options — — 13 Net cash provided by (used in) financing activities 13,083 2,836 (19,864 ) Net change in cash and cash equivalents (2,661 ) (16,410 ) (23,301 ) Cash and cash equivalents, beginning of period 4,201 20,611 43,912 Ending cash and cash equivalents $ 1,540 $ 4,201 $ 20,611

Nature of Operations and Summ_4

Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)Entity	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Number of entities | Entity	2
Federal Statutory Income Tax Rate	21.00%	35.00%	35.00%
Tax Cuts And Jobs Act Of 2017 Change In Tax Rate Income Tax Expense (Benefit)		$ 1,086,000
Tax Cuts and Jobs Act of 2017, Re-measured net deferred tax assets		1,086,000
Tax Cuts and Jobs Act of 2017, Re-measured net deferred tax assets relating to unrealized losses on securities		535,000
Tax Cuts and Jobs Act of 2017, Stranded Tax Effect		535,000
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings		535,000
Interest or penalties incurred	$ 0	$ 0	$ 1,000
ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Operating right of use assets	3,251,000
Operating lease liabilities	3,251,000
ASU 2017-08 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Reduction in amortized cost of investment securities and retained earnings	1,385,000
ASU 2018-15 [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Capitalizing of implementation costs	$ 311,000
Minimum [Member] | Core Deposits [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives of core deposits	7 years
Maximum [Member] | Core Deposits [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives of core deposits	10 years
Buildings and Improvements [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives	39 years
Furniture and Fixtures [Member] | Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives	4 years
Furniture and Fixtures [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives	7 years
Equipment [Member] | Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives	4 years
Equipment [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure And Significant Accounting Policies [Line Items]
Estimated useful lives	7 years

Nature of Operations and Summ_5

Nature of Operations and Summary of Significant Accounting Policies - Summary of Company's Source of Non-interest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-interest income
Increase in bank-owned life insurance	$ 2,199	$ 1,445	$ 1,000
Net gain (loss) from securities transactions	(9)	271	479
Other	2,809	1,903	1,085
Total non-interest income	19,725	15,440	10,466
Service Charges and Fees [Member]
Non-interest income
Non-interest income	7,250	5,319	3,610
Debit Card Income [Member]
Non-interest income
Non-interest income	6,178	4,547	2,898
Mortgage Banking [Member]
Non-interest income
Non-interest income	1,298	1,955	$ 1,394
Accounting Standards Update 2014-09 [Member]
Non-interest income
Increase in bank-owned life insurance	2,199	1,445
Net gain (loss) from securities transactions	(9)	271
Other	2,809	1,903
Total non-interest income	19,725	15,440
Accounting Standards Update 2014-09 [Member] | Service Charges and Fees [Member]
Non-interest income
Non-interest income	7,250	5,319
Accounting Standards Update 2014-09 [Member] | Debit Card Income [Member]
Non-interest income
Non-interest income	6,178	4,547
Accounting Standards Update 2014-09 [Member] | Mortgage Banking [Member]
Non-interest income
Non-interest income	$ 1,298	$ 1,955

Nature of Operations and Summ_6

Nature of Operations and Summary of Significant Accounting Policies - Summary of Company's Source of Non-interest Income (Parenthetical) (Detail) - Other [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Revenue From Contract With Customer [Line Items]
Recovery on zero-basis purchased loans, income from equity method investments	$ 475
Accounting Standards Update 2014-09 [Member]
Revenue From Contract With Customer [Line Items]
Investment referral income, insurance sales commissions and other non-interest income related to loans and deposits	$ 2,333

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Branch	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Aug. 23, 2018USD ($)Branch	May 04, 2018USD ($)	Nov. 10, 2017USD ($)	Mar. 10, 2017USD ($)
Business Acquisition [Line Items]
Goodwill	$ 131,712	$ 104,907	$ 58,874
City Bank and Trust Company [Member]
Business Acquisition [Line Items]
Number of branches | Branch				1
Acquisition-related costs	1,387
Acquisition-related costs after tax	1,054
Goodwill	$ 5,824			$ 5,824
Number of branches acquired | Branch	1
Kansas Bank Corporation [Member]
Business Acquisition [Line Items]
Acquisition-related costs	$ 4,360	14
Acquisition-related costs after tax	3,349	9
Goodwill	$ 14,010				$ 14,010
Number of branches acquired | Branch	5
Voting interest acquired					100.00%
Adams Dairy Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Acquisition-related costs	$ 1,217	4
Acquisition-related costs after tax	961	2
Goodwill	$ 8,465				$ 8,465
Number of branches acquired | Branch	1
Voting interest acquired					100.00%
City Bank, KBC and Adams mergers [Member]
Business Acquisition [Line Items]
Total combined revenue	$ 203,860	147,222
Net income	49,801	27,108
Eastman National Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Acquisition-related costs	146	2,925
Acquisition-related costs after tax	110	1,920
Goodwill	$ 20,743					$ 20,743
Number of branches acquired | Branch	4
Voting interest acquired						100.00%
Cache Holdings, Inc. [Member]
Business Acquisition [Line Items]
Acquisition-related costs	$ 166	1,483
Acquisition-related costs after tax	124	1,031
Goodwill	$ 18,083					$ 18,083
Number of branches acquired | Branch	1
Voting interest acquired						100.00%
Prairie State Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Acquisition-related costs		926
Acquisition-related costs after tax		576
Goodwill	$ 5,713						$ 5,713
Number of branches acquired | Branch	3
Voting interest acquired							100.00%
Prairie, Eastman and Cache Mergers [Member]
Business Acquisition [Line Items]
Total combined revenue		141,843	106,969
Net income		$ 32,539	$ 24,480

Business Combinations - Summary

Business Combinations - Summary of the Consideration Paid and the Amounts of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Aug. 23, 2018	May 04, 2018	Nov. 10, 2017	Mar. 10, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill					$ 131,712	$ 104,907	$ 58,874
City Bank and Trust Company [Member]
Fair value of consideration:
Cash	$ 18,900
Fair value consideration	18,900
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks	27,659
Federal Reserve Bank and Federal Home Loan Bank stock	881
Loans	77,148
Premises and equipment	2,044
Core deposit intangibles	3,360
Other real estate owned	307
Other assets	1,103
Total assets acquired	157,429
Deposits	126,853
Federal Home Loan Bank advances	17,353
Interest payable and other liabilities	147
Total liabilities assumed	144,353
Total identifiable net assets	13,076
Goodwill	5,824				5,824
Total	18,900
City Bank and Trust Company [Member] | Held to Maturity Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities	$ 44,927
Kansas Bank Corporation [Member]
Fair value of consideration:
Common stock		$ 32,103
Cash		14,918
Fair value consideration		47,021
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks		27,899
Federal Reserve Bank and Federal Home Loan Bank stock		475
Loans		159,359
Premises and equipment		5,835
Core deposit intangibles		8,080
Other assets		5,618
Total assets acquired		322,114
Deposits		288,352
Interest payable and other liabilities		751
Total liabilities assumed		289,103
Total identifiable net assets		33,011
Goodwill		14,010			14,010
Total		47,021
Kansas Bank Corporation [Member] | Available for Sale Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities		22,820
Kansas Bank Corporation [Member] | Held to Maturity Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities		92,028
Adams Dairy Bancshares, Inc. [Member]
Fair value of consideration:
Common stock		13,456
Cash		3,960
Fair value consideration		17,416
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks		2,812
Interest bearing time deposits in other banks		4,237
Federal Reserve Bank and Federal Home Loan Bank stock		194
Loans		82,716
Premises and equipment		4,485
Bank-owned life insurance		2,869
Core deposit intangibles		1,990
Other assets		1,042
Total assets acquired		111,357
Deposits		97,124
Federal Home Loan Bank advances		1,000
Interest payable and other liabilities		4,282
Total liabilities assumed		102,406
Total identifiable net assets		8,951
Goodwill		8,465			8,465
Total		17,416
Adams Dairy Bancshares, Inc. [Member] | Available for Sale Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities		10,677
Adams Dairy Bancshares, Inc. [Member] | Held to Maturity Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities		$ 335
Eastman National Bancshares, Inc. [Member]
Fair value of consideration:
Common stock			$ 39,109
Cash			8,096
Fair value consideration			47,205
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks			14,698
Federal Reserve Bank and Federal Home Loan Bank stock			434
Loans			177,880
Premises and equipment			1,903
Core deposit intangibles			4,020
Other real estate owned			41
Interest receivable			998
Other assets			1,047
Total assets acquired			260,799
Deposits			224,111
Federal funds purchased and retail repurchase agreements			8,678
Interest payable and other liabilities			1,548
Total liabilities assumed			234,337
Total identifiable net assets			26,462
Goodwill			20,743		20,743
Total			47,205
Eastman National Bancshares, Inc. [Member] | Available for Sale Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities			59,778
Cache Holdings, Inc. [Member]
Fair value of consideration:
Common stock			39,480
Cash			12,877
Fair value consideration			52,357
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks			10,273
Federal Reserve Bank and Federal Home Loan Bank stock			2,053
Loans held for investment			300,715
Premises and equipment			4,235
Bank-owned life insurance			3,883
Core deposit intangibles			1,580
Interest receivable			778
Other assets			1,813
Total assets acquired			325,330
Deposits			278,706
Federal Home Loan Bank advances			9,402
Bank stock loan			1,000
Interest payable and other liabilities			1,948
Total liabilities assumed			291,056
Total identifiable net assets			34,274
Goodwill			18,083		18,083
Total			$ 52,357
Prairie State Bancshares, Inc. [Member]
Fair value of consideration:
Common stock				$ 15,242
Cash				12,255
Fair value consideration				27,497
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks				6,579
Federal Reserve Bank and Federal Home Loan Bank stock				198
Loans				129,997
Premises and equipment				2,424
Core deposit intangibles				1,448
Other assets				2,331
Total assets acquired				147,375
Deposits				125,353
Interest payable and other liabilities				238
Total liabilities assumed				125,591
Total identifiable net assets				21,784
Goodwill				5,713	$ 5,713
Total				27,497
Prairie State Bancshares, Inc. [Member] | Available for Sale Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities				3,427
Prairie State Bancshares, Inc. [Member] | Held to Maturity Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Held-to maturity/Available-for-sale securities				$ 971

Business Combinations - Informa

Business Combinations - Information about Loans Acquired (Detail) - USD ($) $ in Thousands	Aug. 23, 2018	May 04, 2018	Nov. 10, 2017	Mar. 10, 2017
City Bank and Trust Company [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	$ 77,148
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal	74,918
Cash flows expected to be collected	74,918
Accretable yield	(1,750)
Fair value of acquired loans	73,168
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal	5,136
Non-accretable difference (expected losses)	(1,156)
Cash flows expected to be collected	3,980
Fair value of acquired loans	$ 3,980
Kansas Bank Corporation [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		$ 159,359
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal		160,526
Cash flows expected to be collected		160,526
Accretable yield		(3,928)
Fair value of acquired loans		156,598
Kansas Bank Corporation [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal		5,066
Non-accretable difference (expected losses)		(2,305)
Cash flows expected to be collected		2,761
Fair value of acquired loans		2,761
Adams Dairy Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		82,716
Adams Dairy Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal		84,225
Cash flows expected to be collected		84,225
Accretable yield		(2,748)
Fair value of acquired loans		81,477
Adams Dairy Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal		1,477
Non-accretable difference (expected losses)		(238)
Cash flows expected to be collected		1,239
Fair value of acquired loans		$ 1,239
Eastman National Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			$ 177,880
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal			171,788
Cash flows expected to be collected			171,788
Accretable yield			(2,680)
Fair value of acquired loans			169,108
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal			12,849
Non-accretable difference (expected losses)			(4,077)
Cash flows expected to be collected			8,772
Fair value of acquired loans			8,772
Cache Holdings, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			300,715
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal			302,460
Cash flows expected to be collected			302,460
Accretable yield			(3,017)
Fair value of acquired loans			299,443
Cache Holdings, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal			2,035
Non-accretable difference (expected losses)			(371)
Cash flows expected to be collected			1,664
Accretable yield			(392)
Fair value of acquired loans			$ 1,272
Prairie State Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				$ 129,997
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal				123,519
Cash flows expected to be collected				123,519
Accretable yield				(2,279)
Fair value of acquired loans				121,240
Prairie State Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Contractually required principal				11,430
Non-accretable difference (expected losses)				(2,673)
Cash flows expected to be collected				8,757
Fair value of acquired loans				$ 8,757

Business Combinations - Carryin

Business Combinations - Carrying Value of Loans Acquired (Detail) - USD ($) $ in Thousands	Aug. 23, 2018	May 04, 2018	Nov. 10, 2017	Mar. 10, 2017
City Bank and Trust Company [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	$ 77,148
City Bank and Trust Company [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	19,990
City Bank and Trust Company [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	8,621
City Bank and Trust Company [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	27,514
City Bank and Trust Company [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	5,571
City Bank and Trust Company [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	9,149
City Bank and Trust Company [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	6,303
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	73,168
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	17,398
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	8,463
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	26,716
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	5,571
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	8,905
City Bank and Trust Company [Member] | Non Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	6,115
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	3,980
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	2,592
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	158
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	798
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	244
City Bank and Trust Company [Member] | Purchase Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans	$ 188
Kansas Bank Corporation [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		$ 159,359
Kansas Bank Corporation [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		96,467
Kansas Bank Corporation [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		19,470
Kansas Bank Corporation [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		2,898
Kansas Bank Corporation [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		22,425
Kansas Bank Corporation [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		3,539
Kansas Bank Corporation [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		14,560
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		156,598
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		94,492
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		18,848
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		2,898
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		22,425
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		3,539
Kansas Bank Corporation [Member] | Non Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		14,396
Kansas Bank Corporation [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		2,761
Kansas Bank Corporation [Member] | Purchase Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		1,975
Kansas Bank Corporation [Member] | Purchase Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		622
Kansas Bank Corporation [Member] | Purchase Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		164
Adams Dairy Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		82,716
Adams Dairy Bancshares, Inc. [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		75,477
Adams Dairy Bancshares, Inc. [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		1,421
Adams Dairy Bancshares, Inc. [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		4,955
Adams Dairy Bancshares, Inc. [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		863
Adams Dairy Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		81,477
Adams Dairy Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		74,657
Adams Dairy Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		1,002
Adams Dairy Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		4,955
Adams Dairy Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		863
Adams Dairy Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		1,239
Adams Dairy Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		820
Adams Dairy Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans		$ 419
Eastman National Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			$ 177,880
Eastman National Bancshares, Inc. [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			77,243
Eastman National Bancshares, Inc. [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			38,190
Eastman National Bancshares, Inc. [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			37,304
Eastman National Bancshares, Inc. [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			7,113
Eastman National Bancshares, Inc. [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			5,158
Eastman National Bancshares, Inc. [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			12,872
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			169,108
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			71,917
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			36,645
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			36,846
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			7,080
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			5,158
Eastman National Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			11,462
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			8,772
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			5,326
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			1,545
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			458
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			33
Eastman National Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			1,410
Cache Holdings, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			300,715
Cache Holdings, Inc. [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			200,069
Cache Holdings, Inc. [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			97,036
Cache Holdings, Inc. [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			2,027
Cache Holdings, Inc. [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			265
Cache Holdings, Inc. [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			1,318
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			299,443
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			199,151
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			96,682
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			2,027
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			265
Cache Holdings, Inc. [Member] | Non Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			1,318
Cache Holdings, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			1,272
Cache Holdings, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			918
Cache Holdings, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			$ 354
Prairie State Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				$ 129,997
Prairie State Bancshares, Inc. [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				9,368
Prairie State Bancshares, Inc. [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				12,177
Prairie State Bancshares, Inc. [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				137
Prairie State Bancshares, Inc. [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				28,553
Prairie State Bancshares, Inc. [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				1,451
Prairie State Bancshares, Inc. [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				78,311
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				121,240
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				9,224
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				11,203
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Residential Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				137
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				25,593
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Consumer [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				1,451
Prairie State Bancshares, Inc. [Member] | Non Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				73,632
Prairie State Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				8,757
Prairie State Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				144
Prairie State Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				974
Prairie State Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Agricultural Real Estate [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				2,960
Prairie State Bancshares, Inc. [Member] | Purchase Credit Impaired Loans [Member] | Agricultural [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				$ 4,679

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 173,503	$ 164,069
Available-for-Sale, Gross Unrealized Gains	12	36
Available-for-Sale, Gross Unrealized Losses	(4,640)	(1,833)
Available-for-Sale, Fair Value	168,875	162,272
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost	173,503	163,374
Available-for-Sale, Gross Unrealized Gains	12	36
Available-for-Sale, Gross Unrealized Losses	(4,640)	(1,819)
Available-for-Sale, Fair Value	$ 168,875	161,591
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost		195
Available-for-Sale, Fair Value		195
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale, Amortized Cost		500
Available-for-Sale, Gross Unrealized Losses		(14)
Available-for-Sale, Fair Value		$ 486

Securities - Amortized Cost a_2

Securities - Amortized Cost and Fair Value of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	$ 748,356	$ 535,462
Held-to-Maturity, Gross Unrecognized Gains	3,399	2,622
Held-to-Maturity, Gross Unrecognized Losses	(11,766)	(5,340)
Held-to-Maturity, Fair Value	739,989	532,744
U.S. Government Sponsored Entities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	3,873	998
Held-to-Maturity, Gross Unrecognized Gains	7
Held-to-Maturity, Gross Unrecognized Losses	(20)	(13)
Held-to-Maturity, Fair Value	3,860	985
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	567,766	383,875
Held-to-Maturity, Gross Unrecognized Gains	2,354	573
Held-to-Maturity, Gross Unrecognized Losses	(9,653)	(4,866)
Held-to-Maturity, Fair Value	560,467	379,582
Corporate [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	22,993	22,991
Held-to-Maturity, Gross Unrecognized Gains	234	355
Held-to-Maturity, Gross Unrecognized Losses	(326)
Held-to-Maturity, Fair Value	22,901	23,346
Small Business Administration Loan Pools [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	1,746	2,048
Held-to-Maturity, Gross Unrecognized Losses	(18)	(14)
Held-to-Maturity, Fair Value	1,728	2,034
State and Political Subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	151,978	125,550
Held-to-Maturity, Gross Unrecognized Gains	804	1,694
Held-to-Maturity, Gross Unrecognized Losses	(1,749)	(447)
Held-to-Maturity, Fair Value	$ 151,033	$ 126,797

Securities - Fair Value and Amo

Securities - Fair Value and Amortized Cost of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Available-for-Sale, Amortized Cost, Mortgage-backed securities	$ 173,503
Available-for-Sale, Amortized Cost, Total debt securities	173,503
Available-for-Sale, Fair Value, Mortgage-backed securities	168,875
Available-for-Sale, Fair Value, Total debt securities	168,875
Held-to-Maturity, Amortized Cost, Within one year	6,425
Held-to-Maturity, Amortized Cost, One to five years	36,413
Held-to-Maturity, Amortized Cost, Five to ten years	54,205
Held-to-Maturity, Amortized Cost, After ten years	83,547
Held-to-Maturity, Amortized Cost, Mortgage-backed securities	567,766
Held-to-Maturity, Amortized Cost	748,356	$ 535,462
Held-to-Maturity, Fair Value, Within one year	6,474
Held-to-Maturity, Fair Value, One to five years	36,586
Held-to-Maturity, Fair Value, Five to ten years	54,275
Held-to-Maturity, Fair Value, After ten years	82,187
Held-to-Maturity, Fair Value, Mortgage-backed securities	560,467
Held-to-Maturity, Fair Value, Total debt securities	$ 739,989	$ 532,744

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)	Dec. 31, 2018USD ($)Security	Dec. 31, 2017USD ($)Security
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Carrying value of securities pledged as collateral | $		$ 800,744	$ 570,146
Number of securities of single issuer with book value greater than ten percent of stockholders equity		0	0
Number of unrealized loss position, available-for-sale securities		36
Number of unrealized loss position, held-to-maturity securities		449
Subordinated Notes [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Other-than-temporary impairment loss | $	$ 414
Investment interest rate	9.125%
Investment maturity date	2019-07

Securities - Summary of Gross U

Securities - Summary of Gross Unrealized Losses and Fair Value of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Available-for-sale securities, Less Than 12 Months, Fair Value	$ 48,332	$ 78,884
Total temporarily impaired securities, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(575)	(437)
Total temporarily impaired securities, Available-for-sale securities, 12 Months or More, Fair Value	115,844	59,026
Total temporarily impaired securities, Available-for-sale securities, 12 Months or More, Unrealized Loss	(4,065)	(1,396)
Total temporarily impaired securities, Available-for-sale securities, Fair Value	164,176	137,910
Total temporarily impaired securities, Available-for-sale securities, Unrealized Loss	(4,640)	(1,833)
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Fair Value	81,067	175,619
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(1,158)	(1,403)
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Fair Value	347,156	226,719
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Unrealized Loss	(12,243)	(5,520)
Total temporarily impaired securities, Held-to-maturity securities, Fair Value	428,223	402,338
Total temporarily impaired securities, Held-to-maturity securities, Unrealized Loss	(13,401)	(6,923)
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Available-for-sale securities, Less Than 12 Months, Fair Value	48,332	78,884
Total temporarily impaired securities, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(575)	(437)
Total temporarily impaired securities, Available-for-sale securities, 12 Months or More, Fair Value	115,844	58,540
Total temporarily impaired securities, Available-for-sale securities, 12 Months or More, Unrealized Loss	(4,065)	(1,382)
Total temporarily impaired securities, Available-for-sale securities, Fair Value	164,176	137,424
Total temporarily impaired securities, Available-for-sale securities, Unrealized Loss	(4,640)	(1,819)
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Fair Value	31,270	147,281
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(356)	(1,263)
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Fair Value	294,127	198,239
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Unrealized Loss	(10,579)	(5,030)
Total temporarily impaired securities, Held-to-maturity securities, Fair Value	325,397	345,520
Total temporarily impaired securities, Held-to-maturity securities, Unrealized Loss	(10,935)	(6,293)
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Available-for-sale securities, 12 Months or More, Fair Value		486
Total temporarily impaired securities, Available-for-sale securities, 12 Months or More, Unrealized Loss		(14)
Total temporarily impaired securities, Available-for-sale securities, Fair Value		486
Total temporarily impaired securities, Available-for-sale securities, Unrealized Loss		(14)
U.S. Government Sponsored Entities [Member]
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Fair Value	1,882
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(3)
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Fair Value	982	985
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Unrealized Loss	(17)	(13)
Total temporarily impaired securities, Held-to-maturity securities, Fair Value	2,864	985
Total temporarily impaired securities, Held-to-maturity securities, Unrealized Loss	(20)	(13)
Corporate [Member]
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Fair Value	7,500	5,312
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(326)	(16)
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Fair Value	5,182
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Unrealized Loss	(49)
Total temporarily impaired securities, Held-to-maturity securities, Fair Value	12,682	5,312
Total temporarily impaired securities, Held-to-maturity securities, Unrealized Loss	(375)	(16)
Small Business Administration Loan Pools [Member]
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Fair Value		926
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss		(1)
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Fair Value	1,728	1,108
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Unrealized Loss	(37)	(38)
Total temporarily impaired securities, Held-to-maturity securities, Fair Value	1,728	2,034
Total temporarily impaired securities, Held-to-maturity securities, Unrealized Loss	(37)	(39)
State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Fair Value	40,415	22,100
Total temporarily impaired securities, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(473)	(123)
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Fair Value	45,137	26,387
Total temporarily impaired securities, Held-to-maturity securities, 12 Months or More, Unrealized Loss	(1,561)	(439)
Total temporarily impaired securities, Held-to-maturity securities, Fair Value	85,552	48,487
Total temporarily impaired securities, Held-to-maturity securities, Unrealized Loss	$ (2,034)	$ (562)

Securities - Proceeds from Sale

Securities - Proceeds from Sales and Associated Gains and Losses Reclassified from Other comprehensive Income to Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Proceeds	$ 84,087	$ 70,957
Gross gains	271	893
Income tax expense on net realized gains	$ 103	$ 342

Loans and Allowance For Loan _3

Loans and Allowance For Loan Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 2,575,408	$ 2,117,270
Allowance for loan losses	(11,454)	(8,498)	$ (6,432)	$ (5,506)
Net loans	2,563,954	2,108,772
Commercial Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,251,992	987,661
Allowance for loan losses	(4,662)	(2,740)	(2,420)	(2,051)
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	582,527	521,510
Allowance for loan losses	(2,707)	(2,136)	(1,881)	(1,366)
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	444,540	376,705
Allowance for loan losses	(2,320)	(2,262)	(1,765)	(1,824)
Agricultural Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	139,332	86,486
Allowance for loan losses	(391)	(319)	(35)	(29)
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	62,894	49,361
Allowance for loan losses	(1,070)	(768)	(266)	(187)
Agricultural [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	94,123	95,547
Allowance for loan losses	$ (304)	$ (273)	$ (65)	$ (49)

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)Loan	Dec. 31, 2017USD ($)PoolLoan	Dec. 31, 2016USD ($)
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 2,563,954,000	$ 2,108,772,000
Loans purchased at discount	827,676,000	796,064,000	$ 388,251,000
Discount associated with loans purchased	11,372,000	7,231,000	3,596,000
Provision for loan losses	$ 3,961,000	$ 2,953,000	2,119,000
Troubled debt restructurings | Loan	0	0
Consumer Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Over-draft deposit accounts	$ 1,279,000	$ 741,000
Purchased Credit Impaired Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Accretable yield	3,785,000	1,980,000	1,063,000
Interest income recognized	1,096,000	1,785,000	1,237,000
Provision for loan losses	714,000	194,000	$ 0
Residential Real Estate Loan Pools [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans	$ 64,558,000	85,868,000
Payments to acquire loans		$ 14,767,000
Purchased pools of residential real estate | Pool		1

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	$ 8,498	$ 6,432	$ 5,506
Provision for loan losses	3,961	2,953	2,119
Loans charged-off	(3,757)	(2,135)	(1,720)
Recoveries	2,752	1,248	527
Allowance for Loan Losses, Ending Balance	11,454	8,498	6,432
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	2,740	2,420	2,051
Provision for loan losses	1,832	(69)	725
Loans charged-off	(1,779)	(271)	(557)
Recoveries	1,869	660	201
Allowance for Loan Losses, Ending Balance	4,662	2,740	2,420
Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	2,136	1,881	1,366
Provision for loan losses	636	651	700
Loans charged-off	(118)	(431)	(226)
Recoveries	53	35	41
Allowance for Loan Losses, Ending Balance	2,707	2,136	1,881
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	2,262	1,765	1,824
Provision for loan losses	97	604	75
Loans charged-off	(293)	(350)	(299)
Recoveries	254	243	165
Allowance for Loan Losses, Ending Balance	2,320	2,262	1,765
Agricultural Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	319	35	29
Provision for loan losses	146	287	6
Loans charged-off	(93)	(16)	(23)
Recoveries	19	13	23
Allowance for Loan Losses, Ending Balance	391	319	35
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	768	266	187
Provision for loan losses	1,188	1,236	567
Loans charged-off	(1,431)	(1,025)	(584)
Recoveries	545	291	96
Allowance for Loan Losses, Ending Balance	1,070	768	266
Agricultural [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Beginning Balance	273	65	49
Provision for loan losses	62	244	46
Loans charged-off	(43)	(42)	(31)
Recoveries	12	6	1
Allowance for Loan Losses, Ending Balance	$ 304	$ 273	$ 65

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	$ 912	$ 741
Collectively evaluated for impairment, Allowance for loan losses	9,634	7,563
Purchased credit impaired loans, Allowance for loan losses	908	194
Total Allowance for Loan Losses	11,454	8,498	$ 6,432	$ 5,506
Individually evaluated for impairment	36,563	17,582
Collectively evaluated for impairment	2,508,150	2,070,831
Purchased credit impaired loans	30,695	28,857
Total Loans	2,575,408	2,117,270
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	242	130
Collectively evaluated for impairment, Allowance for loan losses	3,695	2,582
Purchased credit impaired loans, Allowance for loan losses	725	28
Total Allowance for Loan Losses	4,662	2,740	2,420	2,051
Individually evaluated for impairment	23,323	2,728
Collectively evaluated for impairment	1,215,173	971,376
Purchased credit impaired loans	13,496	13,557
Total Loans	1,251,992	987,661
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	185	87
Collectively evaluated for impairment, Allowance for loan losses	2,493	2,028
Purchased credit impaired loans, Allowance for loan losses	29	21
Total Allowance for Loan Losses	2,707	2,136	1,881	1,366
Individually evaluated for impairment	5,020	7,886
Collectively evaluated for impairment	571,171	507,894
Purchased credit impaired loans	6,336	5,730
Total Loans	582,527	521,510
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	391	386
Collectively evaluated for impairment, Allowance for loan losses	1,861	1,815
Purchased credit impaired loans, Allowance for loan losses	68	61
Total Allowance for Loan Losses	2,320	2,262	1,765	1,824
Individually evaluated for impairment	4,434	4,829
Collectively evaluated for impairment	437,219	369,471
Purchased credit impaired loans	2,887	2,405
Total Loans	444,540	376,705
Agricultural Real Estate [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	22	46
Collectively evaluated for impairment, Allowance for loan losses	367	190
Purchased credit impaired loans, Allowance for loan losses	2	83
Total Allowance for Loan Losses	391	319	35	29
Individually evaluated for impairment	856	533
Collectively evaluated for impairment	133,415	82,493
Purchased credit impaired loans	5,061	3,460
Total Loans	139,332	86,486
Consumer [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	62	56
Collectively evaluated for impairment, Allowance for loan losses	925	712
Purchased credit impaired loans, Allowance for loan losses	83
Total Allowance for Loan Losses	1,070	768	266	187
Individually evaluated for impairment	678	556
Collectively evaluated for impairment	61,978	48,802
Purchased credit impaired loans	238	3
Total Loans	62,894	49,361
Agricultural [Member]
Financing Receivable Impaired [Line Items]
Individually evaluated for impairment, Allowance for loan losses	10	36
Collectively evaluated for impairment, Allowance for loan losses	293	236
Purchased credit impaired loans, Allowance for loan losses	1	1
Total Allowance for Loan Losses	304	273	$ 65	$ 49
Individually evaluated for impairment	2,252	1,050
Collectively evaluated for impairment	89,194	90,795
Purchased credit impaired loans	2,677	3,702
Total Loans	$ 94,123	$ 95,547

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	$ 27,774	$ 11,847
With no related allowance recorded, Recorded Investment	27,671	10,615
With no related allowance recorded, Average Recorded Investment	13,832	6,938
With no related allowance recorded, Interest Income Recognized	274	634
With an allowance recorded, Unpaid Principal Balance	17,456	13,968
With an allowance recorded, Recorded Investment	14,879	10,215
Allowance for Loan Losses Allocated	1,820	935
With an allowance recorded, Average Recorded Investment	9,584	7,836
With an allowance recorded, Interest Income Recognized	308	195
Unpaid Principal Balance	45,230	25,815
Recorded Investment	42,550	20,830
Average Recorded Investment	23,416	14,774
Interest Income Recognized	582	829
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	20,940	1,878
With no related allowance recorded, Recorded Investment	20,902	1,567
With no related allowance recorded, Average Recorded Investment	5,652	1,426
With no related allowance recorded, Interest Income Recognized	150	267
With an allowance recorded, Unpaid Principal Balance	8,700	4,049
With an allowance recorded, Recorded Investment	7,179	1,597
Allowance for Loan Losses Allocated	967	158
With an allowance recorded, Average Recorded Investment	2,913	1,813
With an allowance recorded, Interest Income Recognized	142	16
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	3,446	8,679
With no related allowance recorded, Recorded Investment	3,396	8,020
With no related allowance recorded, Average Recorded Investment	5,629	4,572
With no related allowance recorded, Interest Income Recognized	66	252
With an allowance recorded, Unpaid Principal Balance	2,255	1,310
With an allowance recorded, Recorded Investment	1,911	1,113
Allowance for Loan Losses Allocated	214	108
With an allowance recorded, Average Recorded Investment	1,068	663
With an allowance recorded, Interest Income Recognized	53	51
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	533	1,230
With no related allowance recorded, Recorded Investment	527	969
With no related allowance recorded, Average Recorded Investment	744	587
With no related allowance recorded, Interest Income Recognized	20	29
With an allowance recorded, Unpaid Principal Balance	4,934	4,868
With an allowance recorded, Recorded Investment	4,582	4,468
Allowance for Loan Losses Allocated	459	447
With an allowance recorded, Average Recorded Investment	4,188	3,916
With an allowance recorded, Interest Income Recognized	74	95
Agricultural Real Estate [Member]
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	2,038	52
With no related allowance recorded, Recorded Investment	2,035	52
With no related allowance recorded, Average Recorded Investment	1,364	270
With no related allowance recorded, Interest Income Recognized	18	12
With an allowance recorded, Unpaid Principal Balance	261	1,266
With an allowance recorded, Recorded Investment	242	1,034
Allowance for Loan Losses Allocated	24	129
With an allowance recorded, Average Recorded Investment	429	527
With an allowance recorded, Interest Income Recognized	2	16
Consumer [Member]
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	61	1
With no related allowance recorded, Recorded Investment	55
With no related allowance recorded, Average Recorded Investment	32
With no related allowance recorded, Interest Income Recognized	2	1
With an allowance recorded, Unpaid Principal Balance	1,144	677
With an allowance recorded, Recorded Investment	859	559
Allowance for Loan Losses Allocated	145	56
With an allowance recorded, Average Recorded Investment	568	448
With an allowance recorded, Interest Income Recognized	33	15
Agricultural [Member]
Financing Receivable Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	756	7
With no related allowance recorded, Recorded Investment	756	7
With no related allowance recorded, Average Recorded Investment	411	83
With no related allowance recorded, Interest Income Recognized	18	73
With an allowance recorded, Unpaid Principal Balance	162	1,798
With an allowance recorded, Recorded Investment	106	1,444
Allowance for Loan Losses Allocated	11	37
With an allowance recorded, Average Recorded Investment	418	469
With an allowance recorded, Interest Income Recognized	$ 4	$ 2

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Schedule of Aging of Recorded Investment in Past Due Loans by Segment and Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual	$ 18
Nonaccrual	33,203	$ 40,276
Loans Not Past Due	2,533,803	2,071,789
Total Loans	2,575,408	2,117,270
30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	3,280	3,889
60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	5,104	1,316
Commercial Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Nonaccrual	12,768	11,607
Loans Not Past Due	1,237,663	974,748
Total Loans	1,251,992	987,661
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,302	1,284
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	259	22
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Nonaccrual	6,954	13,217
Loans Not Past Due	572,597	508,036
Total Loans	582,527	521,510
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	509	251
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	2,467	6
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual	18
Nonaccrual	5,257	6,148
Loans Not Past Due	436,295	367,924
Total Loans	444,540	376,705
Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	782	1,457
Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	2,188	1,176
Agricultural Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Nonaccrual	4,857	3,993
Loans Not Past Due	134,445	82,370
Total Loans	139,332	86,486
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due		123
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	30
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Nonaccrual	914	559
Loans Not Past Due	61,322	48,331
Total Loans	62,894	49,361
Consumer [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	501	359
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	157	112
Agricultural [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Nonaccrual	2,453	4,752
Loans Not Past Due	91,481	90,380
Total Loans	94,123	95,547
Agricultural [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	186	$ 415
Agricultural [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	$ 3

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Schedule of Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 2,575,408	$ 2,117,270
Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,489,353	2,055,872
Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	86,055	61,398
Commercial Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,251,992	987,661
Commercial Real Estate [Member] | Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,215,015	971,458
Commercial Real Estate [Member] | Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	36,977	16,203
Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	582,527	521,510
Commercial and Industrial [Member] | Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	553,045	500,141
Commercial and Industrial [Member] | Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	29,482	21,369
Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	444,540	376,705
Residential Real Estate [Member] | Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	439,184	370,151
Residential Real Estate [Member] | Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	5,356	6,554
Agricultural Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	139,332	86,486
Agricultural Real Estate [Member] | Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	129,285	77,084
Agricultural Real Estate [Member] | Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	10,047	9,402
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	62,894	49,361
Consumer [Member] | Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	61,976	48,777
Consumer [Member] | Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	918	584
Agricultural [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	94,123	95,547
Agricultural [Member] | Unclassified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	90,848	88,261
Agricultural [Member] | Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 3,275	$ 7,286

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses - Schedule of Recorded Investments in Purchased Credit Impaired Loans (Detail) - Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Line Items]
Contractually required principal payments	$ 40,772	$ 41,349	$ 27,413
Discount	(10,077)	(12,492)	(8,914)
Recorded investment	$ 30,695	$ 28,857	$ 18,499

Other Real Estate Owned - Sched

Other Real Estate Owned - Schedule for Changes in Other Real Estate Owned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate [Abstract]
Beginning of year	$ 7,907	$ 8,656
Transfers in	3,228	4,562
Acquired in acquisition	307	41
Net (loss) gain on sales	(75)	121	$ 156
Proceeds from sales	(4,730)	(5,461)	(3,017)
Other real estate	6,637	7,919
Additions to valuation reserve	(265)	(12)
Recorded investment	$ 6,372	$ 7,907	$ 8,656

Other Real Estate Owned - Summa

Other Real Estate Owned - Summary of Other Real Estate Owned Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate [Abstract]
Net loss (gain) on sales	$ 75	$ (121)	$ (156)
Gain on initial valuation of other real estate properties received	(920)
Provision for unrealized losses	265	12	44
Operating expenses, net of rental income	509	632	498
Other real estate owned	$ (71)	$ 523	$ 386

Other Real Estate Owned - Addit

Other Real Estate Owned - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Residential Real Estate Foreclosed Assets	$ 720	$ 704
Mortgage Loans in Process of Foreclosure, Amount	$ 2,064	$ 2,186

Premises and Equipment - Schedu

Premises and Equipment - Schedule of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 96,321	$ 77,165
Less: accumulated depreciation	(15,879)	(13,716)
Premises and equipment, net	80,442	63,449
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	16,988	13,842
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	62,116	51,703
Furniture Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 17,217	$ 11,620

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases Operating [Abstract]
Operating Leases, Rent Expense, Net	$ 695	$ 691	$ 554

Premises and Equipment - Sche_2

Premises and Equipment - Schedule of Future Minimum Operating Lease Payments (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Property Plant And Equipment Capitalized Interest Costs [Abstract]
Due in one year or less	$ 655
Due after one year through two years	585
Due after two years through three years	362
Due after three years through four years	352
Due after four years through five years	303
Thereafter	1,911
Total	$ 4,168

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Schedule of Intangible Assets and Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill, Beginning balance	$ 104,907	$ 58,874
Acquired in acquisition	26,805	46,033
Goodwill, Ending balance	131,712	104,907	$ 58,874
Beginning Balance	10,738
Amortization	(2,443)	(1,025)	(413)
Ending Balance	21,725	10,738
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning Balance	10,738	4,715
Acquired in acquisition	13,430	7,048
Amortization	(2,443)	(1,025)
Ending Balance	$ 21,725	$ 10,738	$ 4,715

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Expensed in one year or less	$ 2,949
Expensed after one year through two years	2,822
Expensed after two years through three years	2,759
Expensed after three years through four years	2,696
Expensed after four years through five years	2,637
Thereafter	7,862
Total	$ 21,725	$ 10,738

Qualified Affordable Housing _2

Qualified Affordable Housing Project Investments- Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments Schedule [Abstract]
Investment in qualified affordable housing projects	$ 6,689	$ 4,604	$ 4,983
Unfunded Commitment in qualified affordable housing projects	$ 3,965	1,967	2,504
Commitments expected to be fulfill	The Company expects to fulfill these commitments during the years 2019 through 2033.
Amortization expense for qualified affordable housing project investments	$ 412	376	296
Tax credits from investment in affordable housing	$ 568	$ 657	$ 625

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - Swap	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, cap interest rate	4.50%	4.50%
Interest Rate Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Weighted average maturity period	7 years 7 months 6 days
Weighted average pay rate	5.18%
Weighted average receive rate	5.18%
Number of swaps		0
Interest Rate Swaps [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted average maturity period	7 years 8 months 12 days	8 years 8 months 12 days
Weighted average pay rate	4.94%	4.94%
Weighted average receive rate	5.10%	4.13%
Interest Rate Caps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Weighted average maturity period	10 months 24 days	1 year 10 months 24 days

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Notional Balance and Fair Values of Derivatives Outstanding (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount	$ 57,080,000	$ 19,805,000
Derivative Assets	933,000	1,000
Derivative Liabilities	777,000	46,000
Cash collateral, Derivative Assets	(531,000)	0
Cash collateral, Derivative Liabilities	(541,000)	(210,000)
Netting adjustments, Derivative Assets	289,000	164,000
Netting adjustments, Derivative Liabilities	289,000	164,000
Net amount presented in balance sheet, Derivative Assets	691,000	165,000
Net amount presented in balance sheet, Derivative Liabilities	525,000	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	16,743,000	17,231,000
Derivative Assets	242,000
Derivative Liabilities		46,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	16,743,000	17,231,000
Derivative Assets	242,000
Derivative Liabilities		46,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	40,337,000	2,574,000
Derivative Assets	691,000	1,000
Derivative Liabilities	777,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	38,073,000
Derivative Assets	690,000
Derivative Liabilities	777,000
Not Designated as Hedging Instrument [Member] | Interest Rate Caps/Floors [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	2,264,000	2,574,000
Derivative Assets	$ 1,000	$ 1,000

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Net Gains or Losses on Derivatives and Hedging Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives designated as hedging instruments:
Total net gain (loss) related to fair value hedge ineffectiveness	$ 0	$ 0	$ 0
Derivatives not designated as hedging instruments:
Total net gains (losses) related to derivatives not designated as hedging instruments	202	(1)	(1)
Net gains (losses) on derivatives and hedging activities	202	(1)	(1)
Interest Rate Swaps [Member]
Derivatives designated as hedging instruments:
Total net gain (loss) related to fair value hedge ineffectiveness	0	0	0
Derivatives not designated as hedging instruments:
Total net gains (losses) related to derivatives not designated as hedging instruments	$ 202
Interest Rate Caps/Floors [Member]
Derivatives not designated as hedging instruments:
Total net gains (losses) related to derivatives not designated as hedging instruments		$ (1)	$ (1)

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Recorded Net Gains or Losses on Derivatives and Related Hedged Items in Fair Value Hedging Relationships (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net Fair Value Hedge Ineffectiveness	$ 0	$ 0	$ 0
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) on Derivatives	283	12	211
Gain/(Loss) on Hedged Items	(283)	(12)	(211)
Net Fair Value Hedge Ineffectiveness	0	0	0
Effect of Derivatives on Net Interest Income	(40)	(137)	(199)
Fair Value Hedging [Member] | Commercial Real Estate [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) on Derivatives	283	12	211
Gain/(Loss) on Hedged Items	(283)	(12)	(211)
Net Fair Value Hedge Ineffectiveness	0	0	0
Effect of Derivatives on Net Interest Income	$ (40)	$ (137)	$ (199)

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Time Deposits [Line Items]
Total time deposits that met or exceeded the FDIC insurance limit of $250,000	$ 316,288	$ 245,321
CDARS deposits included in time deposit balance	131,107	62,988
Reciprocal Deposits [Member]
Time Deposits [Line Items]
Reciprocal customer funds placed in the CDARS program	$ 20,933	$ 22,934
Reciprocal deposits, description	Reciprocal deposits are not considered brokered deposits as long as the aggregate balance is less than the lesser of 20% of total liabilities or $5 billion and Equity Bank is well capitalized and well rated. All non-reciprocal deposits and reciprocal deposits in excess of regulatory limits are considered brokered deposits.
Interest bearing domestic deposit, certificates of deposits	$ 5,000,000
Reciprocal Deposits [Member] | Minimum [Member]
Time Deposits [Line Items]
Percentage of interest bearing domestic certificates of deposit liabilities to total liabilities	20.00%

Deposits - Summary of Scheduled

Deposits - Summary of Scheduled Maturities of Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Banking And Thrift [Abstract]
Due in one year or less	$ 673,838
Due after one year through two years	209,695
Due after two years through three years	44,784
Due after three years through four years	63,810
Due after four years through five years	14,720
Thereafter	1,059
Total	$ 1,007,906	$ 776,499

Borrowings - Schedule of Federa

Borrowings - Schedule of Federal Funds Purchased and Retail Repurchase Agreements (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Funds Purchased And Securities Sold Under Agreements To Repurchase [Abstract]
Federal funds purchased	$ 0	$ 0
Retail repurchase agreements	$ 50,068	$ 37,492

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	Mar. 13, 2017	Dec. 31, 2018	Mar. 12, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Drawing against Federal Home Loan Bank advances		$ 384,898,000		$ 347,692,000
Line of credit facility maximum borrowing capacity	$ 30,000,000		$ 40,000,000
Debt Instrument, Maturity Date Range, Start		May 15, 2020
Debt Instrument, Term	5 years
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%
Federal Home Loan Bank Line of Credit Advances [Member]
Debt Instrument [Line Items]
Drawing against Federal Home Loan Bank advances		$ 368,770,000		$ 347,692,000
Weighted average interest rate on drawings		2.65%		1.47%
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Letter of credit		$ 31,451,000		$ 5,690,000
Line of credit facility maximum borrowing capacity		951,196,000		478,966,000
Line of credit facility additional borrowing capacity		534,627,000		125,271,000
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Debt Instrument [Line Items]
Residential mortgage-backed securities, fair value		$ 51,701,000		$ 44,768,000

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowing Usage and Interest Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Average daily balance during the period	$ 43,536	$ 25,823
Average interest rate during the period	0.26%	0.25%
Maximum month-end balance during the period	$ 53,815	$ 43,843
Weighted average interest rate at period-end	0.28%	0.23%

Borrowings - Summary of Federal

Borrowings - Summary of Federal Home Loan Bank Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	$ 384,898	$ 347,692
Federal Home Loan Bank Line of Credit Advances [Member]
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	368,770	347,692
Federal Home Loan Bank Fixed Rate Term Advances [Member]
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	16,049
Total Principal Outstanding [Member]
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	384,819	$ 347,692
Federal Home Loan Bank Fixed Rate Term Advances, Fair Market Value Adjustments [Member]
Federal Home Loan Bank Advances [Line Items]
Total Federal Home Loan Bank advances	$ 79

Borrowings - Schedule of Future

Borrowings - Schedule of Future Principal Repayments (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Federal Home Loan Bank Advances [Member]
Debt Instrument Redemption [Line Items]
Due in one year or less	$ 371,724
Due after one year through two years	2,988
Due after two years through three years	2,357
Due after three years through four years	2,357
Due after four years through five years	2,357
Thereafter	3,036
Total	384,819
Bank Stock Loan [Member]
Debt Instrument Redemption [Line Items]
Due in one year or less	1,850
Due after one year through two years	1,600
Due after two years through three years	1,600
Due after three years through four years	1,600
Due after four years through five years	8,800
Total	$ 15,450

Borrowings - Schedule of Bank S

Borrowings - Schedule of Bank Stock Loan Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument Redemption [Line Items]
Bank stock loan	$ 15,450	$ 2,500
Bank Stock Loan [Member]
Debt Instrument Redemption [Line Items]
Bank stock loan	$ 15,450	$ 2,500
Bank stock loan, Weighted Average Rate	5.50%	4.50%

Subordinated Debentures - Addit

Subordinated Debentures - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Subordinated Borrowing [Line Items]
Floating rate subordinated debentures	$ 14,260	$ 13,968
Estimated fair value of debentures	8,270
Community First Bancshares, Inc. [Member]
Subordinated Borrowing [Line Items]
Estimated fair value of debentures	4,187
Trust Preferred Securities [Member] | FCB Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Variable rate trust preferred securities	$ 10,000	$ 10,000
Quarterly distributions, trust preferred securities	Three-month LIBOR plus 2.00%
LIBOR plus rate, percentage	2.00%
Interest rate on trust preferred securities	4.44%	3.36%
Maturity date of trust preferred securities	Apr. 15, 2035
Proceeds from the sale of the trust preferred securities and the issuance of common securities	$ 310
Floating rate subordinated debentures	10,310
Trust Preferred Securities [Member] | FCB Capital Trust III [Member]
Subordinated Borrowing [Line Items]
Variable rate trust preferred securities	$ 5,000	$ 5,000
Quarterly distributions, trust preferred securities	Three-month LIBOR plus 1.89%
LIBOR plus rate, percentage	1.89%
Interest rate on trust preferred securities	4.68%	3.48%
Maturity date of trust preferred securities	Jun. 15, 2037
Proceeds from the sale of the trust preferred securities and the issuance of common securities	$ 155
Floating rate subordinated debentures	$ 5,155
Trust Preferred Securities [Member] | Community First Statutory Trust I [Member] | Community First Bancshares, Inc. [Member]
Subordinated Borrowing [Line Items]
Quarterly distributions, trust preferred securities	Three-month LIBOR plus 3.25%
LIBOR plus rate, percentage	3.25%
Interest rate on trust preferred securities	6.07%	4.92%
Maturity date of trust preferred securities	Dec. 26, 2032

Subordinated Debentures - Summa

Subordinated Debentures - Summary of Contractual Balance and Unamortized Fair Value Adjustments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Brokers And Dealers [Abstract]
Contractual balance	$ 20,620	$ 20,620
Unamortized fair value adjustment	(6,360)	(6,652)
Net book value	$ 14,260	$ 13,968

Contractual Obligations - Addit

Contractual Obligations - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Contractual obligation	$ 3,965	$ 1,967

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	May 04, 2018	Nov. 10, 2017	Mar. 10, 2017	May 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 04, 2016	Aug. 11, 2011
Class of Stock [Line Items]
Number of preferred stock shares authorized					10,000,000
Preferred Stock, shares outstanding					0	0	0
Tax benefit in connection with stock compensation expense								$ 224
Employee stock loan amount					$ 121	$ 121
Employee stock loan maturity date					Dec. 31, 2019
Employee stock loan interest rate					1.68%
Reclassification adjustment for net gains included in net income					$ 0	271	$ 893
Reclassification adjustment of accretion expense to taxable interest income on securities					$ 453	$ 532	$ 615
Preferred Stock, Series C [Member]
Class of Stock [Line Items]
Preferred Stock, shares issued								16,372
Preferred Stock, shares outstanding								16,372
Preferred Stock, Series C [Member] | Small Business Lending Fund [Member]
Class of Stock [Line Items]
Preferred stock liquidation amount per share										$ 1,000
Preferred stock dividend rate								1.00%
Preferred stock liquidation amount									$ 16,372
Class A Common Stock [Member]
Class of Stock [Line Items]
Number of common stock shares authorized					45,000,000
Shares issued, par value					$ 0.01
Shares issued to employees				203,216
Class A Common Stock [Member] | Eastman National Bancshares, Inc. [Member]
Class of Stock [Line Items]
Shares issued or sold		1,179,747
Class A Common Stock [Member] | Cache Holdings, Inc. [Member]
Class of Stock [Line Items]
Shares issued or sold		1,190,941
Class A Common Stock [Member] | Prairie State Bancshares, Inc. [Member]
Class of Stock [Line Items]
Shares issued or sold			479,465
Class A Common Stock [Member] | Kansas Bank Corporation [Member]
Class of Stock [Line Items]
Stock Issued in connection with merger	820,849
Class A Common Stock [Member] | Adams Dairy Bancshares, Inc. [Member]
Class of Stock [Line Items]
Stock Issued in connection with merger	344,063
Class B Common Stock [Member]
Class of Stock [Line Items]
Number of common stock shares authorized					5,000,000
Shares issued, par value					$ 0.01

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Shares Issued and Held in Treasury or Outstanding (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017
Class A Common Stock [Member]
Class of Stock [Line Items]
Common stock - issued	17,244,138	15,876,650
Common stock - held in treasury	(1,271,043)	(1,271,043)
Common stock - outstanding	15,973,095	14,605,607
Class B Common Stock [Member]
Class of Stock [Line Items]
Common stock - issued	234,903	234,903
Common stock - held in treasury	(234,903)	(234,903)
Common stock - outstanding		0

Stockholders' Equity - Componen

Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ (4,867)	$ (3,092)
Accumulated Net Unrealized Investment Gain (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized or unamortized gains (losses)	(6,519)	(4,141)
Tax effect	1,652	1,049
Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(3,455)	(1,342)
Available for Sale Securities [Member] | Accumulated Net Unrealized Investment Gain (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized or unamortized gains (losses)	(4,628)	(1,797)
Tax effect	1,173	455
Held to Maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(1,412)	(1,750)
Held to Maturity Securities [Member] | Accumulated Net Unrealized Investment Gain (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized or unamortized gains (losses)	(1,891)	(2,344)
Tax effect	$ 479	$ 594

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax expense
Federal	$ 4,655	$ 6,474	$ 2,863
State	2,212	1,282	723
Total current income tax expense	6,867	7,756	3,586
Deferred income tax expense
Federal	2,933	2,550	865
State	550	71	44
Total deferred income tax expense	3,483	2,621	909
Total income tax expense	$ 10,350	$ 10,377	$ 4,495

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Federal Statutory Income Tax Rate	21.00%	35.00%	35.00%
Tax Cuts And Jobs Act Of 2017 Change In Tax Rate Income Tax Expense (Benefit)		$ 1,086,000
Tax cuts and jobs act of 2017 additional income tax expense	$ 0
Decrease in net deferred tax assets related to unrealized or unamortized losses on securities		535,000
Excess tax benefit in connection with stock compensation expense			$ 13,000
Deferred tax liabilities	12,016,000	8,130,000
Acquired federal net operating losses	464,000
Acquired federal tax credits	974,000
Eastman National Bank [Member]
Income Tax [Line Items]
Deferred tax assets		2,832,000
Deferred tax liabilities		2,075,000
Cache Holdings, Inc. [Member]
Income Tax [Line Items]
Deferred tax assets		1,446,000
Deferred tax liabilities		694,000
Kansas Bank Corporation [Member]
Income Tax [Line Items]
Deferred tax assets	2,522,000
Deferred tax liabilities	2,190,000
Adams Dairy Bancshares, Inc. [Member]
Income Tax [Line Items]
Deferred tax assets	1,134,000
Deferred tax liabilities	518,000
City Bank and Trust Company [Member]
Income Tax [Line Items]
Deferred tax assets	$ 34,000
Domestic Tax Authority [Member]
Income Tax [Line Items]
Operating loss carry forwards, expiration date	Between 2031 and 2033
Tax credits, expiration date	Between 2027 and 2033
State and Local Jurisdiction [Member] | Kansas [Member]
Income Tax [Line Items]
Operating loss carry forwards, expiration date	between 2020 and 2028
Operating loss carryforwards	$ 25,141,000
State and Local Jurisdiction [Member] | First Independence Corporation and Subsidiary [Member] | Kansas [Member]
Income Tax [Line Items]
Operating loss carry forwards, expiration date	between 2020 and 2024
Operating loss carryforwards	$ 2,885,000
Accounting Standards Update 2016-09 [Member]
Income Tax [Line Items]
Excess tax benefit in connection with stock compensation expense	$ 23,000	$ 335,000

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Computed at the statutory rate	$ 9,697	$ 10,862	$ 4,854
Increase (decrease) resulting from:
State and local taxes, net of federal benefit	1,962	717	449
Tax-exempt interest	(844)	(1,177)	(576)
Non-taxable life insurance income	(462)	(506)	(350)
Non-deductible expenses	530	376	689
Share-based payments	(23)	(335)
Federal tax credits	(568)	(660)	(625)
Change in valuation allowance	336	187	65
Effect of tax reform		1,086
Other	(278)	(173)	(11)
Total income tax expense	$ 10,350	$ 10,377	$ 4,495

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Allowance for loan losses	$ 2,880	$ 2,121
Net unrealized or unamortized losses on securities	1,639	1,034
Tax credit carryforwards	974	974
Accrued compensation	1,675	1,208
Net operating loss carryforwards	1,003	797
Other real estate owned	656	588
Acquired loans fair market value adjustments	4,058	4,532
Other	1,072	404
Gross deferred tax assets	13,957	11,658
Deferred tax liabilities
Assumed debt fair market value adjustments	1,537	1,607
Goodwill amortization	1,492	1,267
Depreciation	3,288	1,831
Federal Home Loan Bank stock dividends	1,123	764
Core deposit intangibles	4,293	2,301
Other	283	360
Gross deferred tax liabilities	12,016	8,130
State valuation allowance	(908)	(571)
Net deferred tax asset	$ 1,033	$ 2,957

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Detail)	1 Months Ended
	Jan. 31, 2016	Dec. 31, 2018
Regulated Operations [Abstract]
CET1 capital ratio to be well capitalized under rules and prompt corrective provisions		6.50%
Total Tier 1 capital ratio to be well capitalized under rules and prompt corrective provisions		8.00%
Total capital ratio to be well capitalized under rules and prompt corrective provisions		10.00%
Leverage ratio to be well capitalized under rules and prompt corrective provisions		5.00%
Capital conservation buffer desired rate		2.50%
Capital conservation buffer yearly increase	0.625%

Regulatory Matters - Summary of

Regulatory Matters - Summary of Company's and Equity Bank's Capital Amounts and Ratios (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	10.00%
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	8.00%
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	6.50%
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	5.00%
Equity Bancshares, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, Actual Amount	$ 337,649	$ 288,353
Total capital to risk weighted assets, Actual Ratio	11.92%	12.54%
Tier 1 capital to risk weighted assets, Actual Amount	$ 326,195	$ 279,855
Tier 1 capital to risk weighted assets, Actual Ratio	11.52%	12.17%
Common equity Tier 1 capital to risk weighted assets, Actual Amount	$ 311,935	$ 265,887
Common equity Tier 1 capital to risk weighted assets, Actual Ratio	11.02%	11.56%
Tier 1 leverage to average assets, Actual Amount	$ 326,195	$ 279,855
Tier 1 leverage to average assets, Actual Ratio	8.60%	10.33%
Equity Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, Actual Amount	$ 338,180	$ 279,712
Total capital to risk weighted assets, Actual Ratio	11.96%	12.17%
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 282,779	$ 229,927
Total capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	10.00%	10.00%
Tier 1 capital to risk weighted assets, Actual Amount	$ 326,726	$ 271,214
Tier 1 capital to risk weighted assets, Actual Ratio	11.55%	11.80%
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount	$ 226,223	$ 183,942
Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	8.00%	8.00%
Common equity Tier 1 capital to risk weighted assets, Actual Amount	$ 326,726	$ 271,214
Common equity Tier 1 capital to risk weighted assets, Actual Ratio	11.55%	11.80%
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount	$ 183,806	$ 149,452
Common equity Tier 1 capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	6.50%	6.50%
Tier 1 leverage to average assets, Actual Amount	$ 326,726	$ 271,214
Tier 1 leverage to average assets, Actual Ratio	8.62%	10.01%
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Amount	$ 189,488	$ 135,439
Tier 1 leverage to average assets, To Be Well Capitalized Under Prompt Corrective Provisions, Actual Ratio	5.00%	5.00%
Basel III Phase-In [Member] | Equity Bancshares, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 279,621	$ 212,705
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	9.88%	9.25%
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 222,989	$ 166,715
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	7.88%	7.25%
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 180,515	$ 132,222
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	6.38%	5.75%
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 151,731	$ 108,372
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	4.00%	4.00%
Basel III Phase-In [Member] | Equity Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 279,244	$ 212,682
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	9.88%	9.25%
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 222,688	$ 166,697
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	7.88%	7.25%
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 180,271	$ 132,208
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	6.38%	5.75%
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 151,590	$ 108,351
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	4.00%	4.00%
Basel III Fully Phased-In [Member] | Equity Bancshares, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	10.50%	10.50%
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 297,319	$ 241,449
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 240,687	$ 195,459
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	8.50%	8.50%
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 198,213	$ 160,966
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	7.00%	7.00%
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 151,731	$ 108,372
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	4.00%	4.00%
Basel III Fully Phased-In [Member] | Equity Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	10.50%	10.50%
Total capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 296,918	$ 241,423
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 240,362	$ 195,438
Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	8.50%	8.50%
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 197,945	$ 160,949
Common equity Tier 1 capital to risk weighted assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	7.00%	7.00%
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Amount	$ 151,590	$ 108,351
Tier 1 leverage to average assets, Minimum Required for Capital Adequacy Purposes, Actual Ratio	4.00%	4.00%

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Related Party Transactions [Abstract]
Loans outstanding to related parties	$ 2,267	$ 3,892
Deposits from related parties	$ 6,127	$ 6,274

Related-Party Transactions - Ch

Related-Party Transactions - Changes in Loans Outstanding to Related Parties (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Related Party Transactions [Abstract]
Beginning balance	$ 3,892
New loans/advances	1,803
Repayments	(3,428)
Ending balance	$ 2,267

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)ParticipantAgreement	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Pentegra Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Identification Number	135645888
Plan number	333
Number of collective bargaining agreements | Agreement	0
Pentegra Defined Benefit Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contributions to plan	5.00%
Pentegra Defined Benefit Plan [Member] | First Independence Corporation and Subsidiary [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of participants retaining benefits under the plan | Participant	55
Defined Contribution Profit Sharing Plan And Retirement Savings 401 (k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum contributions employees may contribute	$ 19,000
Employer contributions charged to expense	$ 885,000	$ 704,000	$ 479,000

Employee Benefits - Schedule of

Employee Benefits - Schedule of Net Pension Cost and Funded Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Net Pension Cost And Funded Status [Line Items]
Net pension cost charged to salaries and employee benefits	$ 113	$ 84
Pentegra defined benefit plan funded status as of July 1	109.86%	110.37%
Contributions paid to the plan	$ 93	$ 65
Plan's Funded Status [Member]
Schedule Of Net Pension Cost And Funded Status [Line Items]
Pentegra defined benefit plan funded status as of July 1	94.30%	96.89%

Share-Based Payments - Addition

Share-Based Payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit in connection with stock compensation expense				$ 224
Amended and Restated 2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares reserved	1,500,000
Stock issued during period share-based compensation, value	$ 1,375	$ 1,457	$ 953
Options, Granted	99,935	305,404
Fair values of stock options granted	$ 9.01	$ 8.75	$ 5.10
Amended and Restated 2013 Stock Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 813	$ 592	$ 374
Tax benefit in connection with stock compensation expense	205	226	143
Unrecognized compensation expense related to non-vested stock options	$ 2,000
Unrecognized compensation expense not yet recognized, period for recognition	7 years
Amended and Restated 2013 Stock Incentive Plan [Member] | Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 53	$ 46	32
Stock Option 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Vested and Exercisable	150,000	150,000
Options, Granted	0	0
Shares available for equity awards	614,424
Restricted Stock Unit Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 1,643	$ 80	0
Tax benefit in connection with stock compensation expense	413	$ 31	$ 0
Unrecognized compensation expense related to non-vested stock options	$ 3,700
Unrecognized compensation expense not yet recognized, period for recognition	3 years
Share-based compensation arrangement by share-based payment award, award vesting period	10 years

Share-Based Payments - Summary

Share-Based Payments - Summary of Stock Option Activity (Detail) - Amended and Restated 2013 Stock Incentive Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding at beginning of year	797,521	590,835
Options, Granted	99,935	305,404
Options, Exercised	(6,800)	(71,434)
Options, Forfeited or expired	(38,100)	(27,284)
Options, Outstanding at end of year	852,556	797,521	590,835
Options, Fully vested and expected to vest	852,556	797,521
Options, Exercisable at end of year	565,847	484,728
Weighted Average Exercise Price, Outstanding at beginning of year	$ 22.54	$ 16.69
Weighted Average Exercise Price, Granted	34.69	33.05
Weighted Average Exercise Price, Exercised	(19.49)	(17.01)
Weighted Average Exercise Price, Forfeited or expired	(31.97)	(27.72)
Weighted Average Exercise Price, Outstanding at end of year	23.57	22.54	$ 16.69
Weighted Average Exercise Price, Fully vested and expected to vest	23.57	22.54
Weighted Average Exercise Price, Exercisable at end of year	$ 19.44	$ 17.48
Weighted Average Remaining Contractual Term, Outstanding	7 years	8 years	7 years
Weighted Average Remaining Contractual Term, Granted	10 years	10 years
Weighted Average Remaining Contractual Term, Exercised	8 years	3 years
Weighted Average Remaining Contractual Term, Forfeited or expired	10 years	10 years
Weighted Average Remaining Contractual Term, Fully vested and expected to vest	7 years	8 years
Weighted Average Remaining Contractual Term, Exercisable at end of year	4 years	7 years
Aggregate Intrinsic Value, Outstanding at beginning of year	$ 10,044	$ 10,261	$ 10,017
Aggregate Intrinsic Value, Fully vested and expected to vest	10,044	10,261
Aggregate Intrinsic Value, Exercisable at end of year	$ 8,995	$ 8,692

Share-Based Payments - Schedule

Share-Based Payments - Schedule of Fair Values of Options Granted (Detail) - Amended and Restated 2013 Stock Incentive Plan [Member] - Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free rate	2.45%	2.20%	1.58%
Market value of stock on grant date	$ 34.69	$ 33.05	$ 25.44
Expected term (in years)	6 years 3 months 18 days	6 years 8 months 12 days	5 years
Expected volatility	19.71%	19.66%	19.08%

Share-Based Payments - Summar_2

Share-Based Payments - Summary of Changes in Company's Non-vested RSUs (Detail) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested Restricted Stock Units, Outstanding at beginning of year | shares	4,890
Non-vested Restricted Stock Units, Granted | shares	145,288
Non-vested Restricted Stock Units, Vested | shares	(14,401)
Non-vested Restricted Stock Units, Forfeited | shares	(3,670)
Non-vested Restricted Stock Units, Outstanding at end of year | shares	132,107
Weighted Average Grant Date Fair Value, Outstanding at beginning of year | $ / shares	$ 33.50
Weighted Average Grant Date Fair Value, Granted | $ / shares	36.89
Weighted Average Grant Date Fair Value, Vested | $ / shares	(36.55)
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	(37.57)
Weighted Average Grant Date Fair Value, Outstanding at end of year | $ / shares	$ 36.78

Earnings Per Share - Summary of

Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic:
Net income allocable to common stockholders	$ 35,825	$ 20,649	$ 9,373
Weighted average common shares outstanding	15,389,513	12,446,851	8,624,108
Weighted average vested restricted stock units	4,403	1,751
Weighted average shares	15,393,916	12,448,602	8,624,108
Basic earnings per common share	$ 2.33	$ 1.66	$ 1.09
Diluted:
Net income allocable to common stockholders	$ 35,825	$ 20,649	$ 9,373
Weighted average common shares outstanding for:
Basic earnings per common share	15,393,916	12,448,602	8,624,108
Dilutive effects of the assumed exercise of stock options	293,588	255,947	131,418
Dilutive effects of the assumed redemption of RSUs	20,882	2,635
Average shares and dilutive potential common shares	15,708,386	12,707,184	8,755,526
Diluted earnings per common share	$ 2.28	$ 1.62	$ 1.07

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding stock options, antidilutive	26,419	141,891	92

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities	$ 168,875	$ 162,272
Cash collateral held by counterparty and netting adjustments	289	164
Total assets	4,061,716	3,170,509
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities	168,875	161,591
State and Political Subdivisions [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities		195
Equity Securities [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities		486
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative assets	(242)	164
Cash collateral held by counterparty and netting adjustments	(242)	164
Equity securities with readily determinable fair value	475
Total other assets	475
Total assets	233	650
Derivative liabilities	(252)	(46)
Cash collateral held by counterparty and netting adjustments	(252)	(46)
Total liabilities	(252)	(46)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities		486
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative assets	933	1
Total assets	169,808	161,787
Derivative liabilities	777	46
Total liabilities	777	46
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Assets [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative assets	933	1
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Liabilities [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Derivative liabilities	777	46
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities	$ 168,875	161,591
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | State and Political Subdivisions [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Available for sale securities		$ 195

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value, level transfers, Amount	$ 0	$ 0
Assets Measured at Fair Value on a Non-recurring Basis [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a non-recurring basis	$ 0	$ 0

Fair Value - Summary of Assets

Fair Value - Summary of Assets Measured at Fair Value on Non-recurring Basis (Detail) - Level 3 [Member] - Assets Measured at Fair Value on a Non-recurring Basis [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Impaired Loans [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	$ 13,059	$ 9,280
Impaired Loans [Member] | Commercial Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	6,212	1,439
Impaired Loans [Member] | Commercial and Industrial [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	1,697	1,005
Impaired Loans [Member] | Residential Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	4,123	4,021
Impaired Loans [Member] | Agricultural Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	218	905
Impaired Loans [Member] | Other [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	809	1,910
Other Real Estate Owned [Member] | Commercial Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	1,391	1,018
Other Real Estate Owned [Member] | Residential Real Estate [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	$ 97	$ 157

Fair Value - Summary of Additio

Fair Value - Summary of Additional Information about Unobservable Inputs Used in Fair Value Measurement (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Impaired Loans [Member] - Level 3 [Member] $ in Thousands	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 13,059	$ 9,280
Alternative Investment, Valuation Technique [Extensible List]	eqbk:SalesComparisonApproachMember	eqbk:SalesComparisonApproachMember
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.04	0.15
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.22	0.26
Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.13	0.05

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instrument (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 192,818	$ 52,195
Interest-bearing deposits	4,991	3,496
Available-for-sale securities	168,875	162,272
Held-to-maturity securities	748,356	535,462
Loans held for sale	2,972	2,353
Loans, net of allowance for loan losses	2,563,954	2,108,772
Federal Reserve Bank and Federal Home Loan Bank stock	29,214	24,373
Interest receivable	17,372	12,371
Derivative Assets	933	1
Total assets	4,061,716	3,170,509
Deposits	3,123,447	2,382,013
Federal funds purchased and retail repurchase agreements	50,068	37,492
Federal Home Loan Bank advances	384,898	347,692
Bank stock loan	15,450	2,500
Subordinated debentures	14,260	13,968
Contractual obligations	3,965	1,967
Derivative Liabilities	777	46
Total liabilities	3,605,775	2,796,365
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	192,818	52,195
Interest-bearing deposits	4,991	3,496
Available-for-sale securities	168,875	162,272
Held-to-maturity securities	748,356	535,462
Loans held for sale	2,972	2,353
Loans, net of allowance for loan losses	2,563,954	2,108,772
Federal Reserve Bank and Federal Home Loan Bank stock	29,214	24,373
Interest receivable	17,372	12,371
Derivative Assets	933	1
Cash collateral held by derivative counterparty	(242)	164
Total derivative assets	691	165
Total assets	3,729,243	2,901,459
Deposits	3,123,447	2,382,013
Federal funds purchased and retail repurchase agreements	50,068	37,492
Federal Home Loan Bank advances	384,898	347,692
Bank stock loan	15,450	2,500
Subordinated debentures	14,260	13,968
Contractual obligations	3,965	1,967
Interest payable	3,648	1,932
Derivative Liabilities	777	46
Cash collateral held by derivative counterparty	(252)	(46)
Total derivative liabilities	525
Total liabilities	3,596,261	2,787,564
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	192,818	52,195
Interest-bearing deposits	4,991	3,496
Available-for-sale securities	168,875	162,272
Held-to-maturity securities	739,989	532,744
Loans held for sale	2,972	2,353
Loans, net of allowance for loan losses	2,565,526	2,112,422
Interest receivable	17,372	12,371
Derivative Assets	933	1
Cash collateral held by derivative counterparty	(242)	164
Total derivative assets	691	165
Deposits	3,124,654	2,385,528
Federal funds purchased and retail repurchase agreements	50,068	37,492
Federal Home Loan Bank advances	384,898	347,692
Bank stock loan	15,450	2,500
Subordinated debentures	14,260	13,968
Contractual obligations	3,965	1,967
Interest payable	3,648	1,932
Derivative Liabilities	777	46
Cash collateral held by derivative counterparty	(252)	(46)
Total derivative liabilities	525
Total liabilities	3,597,468	2,791,079
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	192,818	52,195
Available-for-sale securities		486
Cash collateral held by derivative counterparty	(242)	164
Total derivative assets	(242)	164
Cash collateral held by derivative counterparty	(252)	(46)
Total derivative liabilities	(252)	(46)
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest-bearing deposits	4,991	3,496
Available-for-sale securities	168,875	161,786
Held-to-maturity securities	739,989	532,744
Loans held for sale	2,972	2,353
Interest receivable	17,372	12,371
Derivative Assets	933	1
Total derivative assets	933	1
Deposits	3,124,654	2,385,528
Federal funds purchased and retail repurchase agreements	50,068	37,492
Federal Home Loan Bank advances	384,898	347,692
Bank stock loan	15,450	2,500
Subordinated debentures	14,260	13,968
Contractual obligations	3,965	1,967
Interest payable	3,648	1,932
Derivative Liabilities	777	46
Total derivative liabilities	777	46
Total liabilities	3,597,720	2,791,125
Estimated Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net of allowance for loan losses	2,565,526	2,112,422
Estimated Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,693,234	2,878,018
Estimated Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	192,576	52,845
Estimated Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	935,132	712,751
Estimated Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	$ 2,565,526	$ 2,112,422

Commitments and Credit Risk - S

Commitments and Credit Risk - Summary of Contractual Amounts of Commitments and Standby Letters of Credit to Originate Loans and Available Lines of Credit (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Standby Letters of Credit [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	$ 4,474	$ 4,064
Loans commitments, Variable Rate	2,716	3,830
Commitments to Make Loans [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	29,543	38,031
Loans commitments, Variable Rate	171,857	67,107
Mortgage Loans in the Process of Origination [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	6,785	14,803
Loans commitments, Variable Rate	2,860	9,258
Unused Lines of Credit [Member]
Commitments And Contingencies [Line Items]
Loans commitments, Fixed Rate	92,225	87,948
Loans commitments, Variable Rate	$ 167,218	$ 141,026

Commitments and Credit Risk - A

Commitments and Credit Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Minimum [Member]
Commitments And Contingencies [Line Items]
Fixed interest rate loan commitments	3.75%
Fixed interest rate loan commitments maturity period	1 month
Maximum [Member]
Commitments And Contingencies [Line Items]
Fixed interest rate loan commitments	8.50%
Fixed interest rate loan commitments maturity period	81 months

Legal Matters - Additional Info

Legal Matters - Additional Information (Detail) - Obligation to Repurchase Receivables Sold - Citi Mortgage, Inc [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Loss contingency damages value	$ 2,700
Loss contingency, date of dismissal	Jan. 31, 2018
Loss contingency recorded		$ 477

Condensed Financial Informati_3

Condensed Financial Information (Parent Company Only) - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 192,735	$ 48,034
Other assets	19,808	13,830
Total assets	4,061,716	3,170,509
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities	3,605,775	2,796,365
Stockholders' equity	455,941	374,144	$ 257,964	$ 167,233
Total liabilities and stockholders’ equity	4,061,716	3,170,509
Equity Bancshares, Inc. [Member]
ASSETS
Cash and due from banks	1,540	4,201
Investment	470,902	379,933
Other assets	10,490	6,762
Total assets	486,194	390,896
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities	30,253	16,752
Stockholders' equity	455,941	374,144
Total liabilities and stockholders’ equity	486,194	$ 390,896
Equity Bancshares, Inc. [Member] | EBAC [Member]
ASSETS
Investment	$ 3,262

Condensed Financial Informati_4

Condensed Financial Information (Parent Company Only) - Condensed Statement of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses
Interest expense	$ 36,758	$ 16,691	$ 9,202
Net income	35,825	20,649	9,374
Dividends and discount accretion on preferred stock			(1)
Net income allocable to common stockholders	35,825	20,649	9,373
Equity Bancshares, Inc. [Member]
Condensed Income Statements, Captions [Line Items]
Dividends from Equity Bank	30,500	17,250	9,500
Other income	3	26	1
Total income	30,503	17,276	9,501
Expenses
Interest expense	1,918	996	701
Other expenses	3,358	3,018	2,408
Total expenses	5,276	4,014	3,109
Income (loss) before income tax and equity in undistributed income of subsidiaries	25,227	13,262	6,392
Income tax benefit	1,025	2,017	859
Income (loss) before equity in undistributed income (loss) of subsidiaries	26,252	15,279	7,251
Equity in undistributed income (loss)	9,681	5,370	2,123
Net income	35,825	20,649	9,374
Dividends and discount accretion on preferred stock			(1)
Net income allocable to common stockholders	35,825	$ 20,649	$ 9,373
Equity Bancshares, Inc. [Member] | EBAC [Member]
Expenses
Equity in undistributed income (loss)	$ (108)

Condensed Financial Informati_5

Condensed Financial Information (Parent Company Only) - Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 35,825	$ 20,649	$ 9,374
Adjustments to reconcile net income to net cash from operating activities:
Stock based compensation	2,509	1,100	553
Net amortization of purchase valuation adjustments	(5,586)	(4,518)	615
Net change in:
Other assets	(5,738)	(673)	885
Interest payable and other liabilities	1,259	433	15
Net cash provided by operating activities	36,666	27,628	15,548
Cash flows (to) from investing activities
Proceeds from sale of other real estate owned	4,730	5,461	3,017
Net cash (used in) investing activities	(171,488)	(222,924)	(140,689)
Cash flows (to) from financing activities
Borrowings on bank stock loan	22,500	2,500	6,000
Principal payments on bank stock loan	(9,550)	(1,000)	(33,218)
Proceeds from the issuance of common stock, net			23,643
Proceeds from exercise of employee stock options	133	1,215	112
Principal payments on employee stock loan		121
Redemption of Series C preferred stock			(16,372)
Dividends paid on preferred stock			(42)
Excess tax benefits as a result of the exercise of employee stock options			13
Net cash provided by (used in) financing activities	275,445	212,396	103,407
Net change in cash and cash equivalents	140,623	17,100	(21,734)
Cash and cash equivalents, beginning of period	52,195	35,095	56,829
Ending cash and cash equivalents	192,818	52,195	35,095
Equity Bancshares, Inc. [Member]
Cash flows from operating activities
Net income	35,825	20,649	9,374
Adjustments to reconcile net income to net cash from operating activities:
Stock based compensation	2,509	1,100	553
Equity in undistributed (income) loss	(9,681)	(5,370)	(2,123)
Net amortization of purchase valuation adjustments	292	284	246
Net change in:
Other assets	(4,092)	(1,331)	(1,529)
Interest payable and other liabilities	(50)	(1,419)	(409)
Net cash provided by operating activities	24,911	13,913	6,112
Cash flows (to) from investing activities
Proceeds from sale of other real estate owned		267
Net cash (used in) investing activities	(40,655)	(33,159)	(9,549)
Cash flows (to) from financing activities
Borrowings on bank stock loan	22,500	2,500	6,000
Principal payments on bank stock loan	(9,550)	(1,000)	(33,218)
Proceeds from the issuance of common stock, net			23,643
Proceeds from exercise of employee stock options	133	1,215	112
Principal payments on employee stock loan		121
Dividends paid on preferred stock			(42)
Excess tax benefits as a result of the exercise of employee stock options			13
Net cash provided by (used in) financing activities	13,083	2,836	(19,864)
Net change in cash and cash equivalents	(2,661)	(16,410)	(23,301)
Cash and cash equivalents, beginning of period	4,201	20,611	43,912
Ending cash and cash equivalents	1,540	4,201	20,611
EBAC [Member] | Equity Bancshares, Inc. [Member]
Adjustments to reconcile net income to net cash from operating activities:
Equity in undistributed (income) loss	108
Cash flows (to) from investing activities
Net cash paid for acquisition	(3,370)
Preferred Stock, Series C [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from financing activities
Redemption of Series C preferred stock			(16,372)
Community First Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition			(2,971)
Community First Bancshares, Inc. [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition			$ (9,549)
Prairie State Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition		(6,744)
Prairie State Bancshares, Inc. [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition		(12,510)
Eastman National Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	(55)	6,108
Eastman National Bancshares, Inc. [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	(55)	(7,813)
Cache Holdings, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition		(2,857)
Cache Holdings, Inc. [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition		$ (13,103)
Kansas Bank Corporation [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	12,774
Kansas Bank Corporation [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	(14,151)
Adams Dairy Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	(1,385)
Adams Dairy Bancshares, Inc. [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	(4,179)
City Bank and Trust Company [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	8,759
City Bank and Trust Company [Member] | Equity Bancshares, Inc. [Member]
Cash flows (to) from investing activities
Net cash paid for acquisition	$ (18,900)

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 21, 2018USD ($)Branch	Dec. 31, 2017USD ($)
Subsequent Event [Line Items]
Total assets	$ 4,061,716		$ 3,170,509
Total loans	2,563,954		2,108,772
Total liabilities	3,605,775		2,796,365
Deposits	$ 3,123,447		$ 2,382,013
MidFirst Bank [Member]
Subsequent Event [Line Items]
Business acquisition agreement date	Sep. 21, 2018
Total assets		$ 14,144
Total loans		6,507
Total liabilities		98,606
Deposits		$ 98,543
MidFirst Bank [Member] | Guymon, Oklahoma [Member]
Subsequent Event [Line Items]
Number of branches | Branch		2
MidFirst Bank [Member] | Cordell, Oklahoma [Member]
Subsequent Event [Line Items]
Number of branches | Branch		1