West Bancorporation (WTBA) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 27, 2019	Jun. 29, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	WEST BANCORPORATION INC
Entity Central Index Key	1,166,928
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding		16,295,494
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 396,500,665

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 46,369	$ 34,952
Federal funds sold	1,105	12,997
Cash and cash equivalents	47,474	47,949
Investment securities available for sale, at fair value	453,758	444,219
Investment securities held to maturity, at amortized cost (fair value $45,890 at December 31, 2017)	0	45,527
Federal Home Loan Bank stock, at cost	12,037	9,174
Loans	1,721,830	1,510,500
Allowance for loan losses	(16,689)	(16,430)
Loans, net	1,705,141	1,494,070
Premises and equipment, net	21,491	23,022
Accrued interest receivable	7,631	7,344
Bank-owned life insurance	34,249	33,618
Deferred tax assets, net	6,518	4,645
Other assets	8,269	4,809
Total assets	2,296,568	2,114,377
Deposits:
Noninterest-bearing demand	400,530	395,888
Interest-bearing demand	336,089	395,052
Savings	950,501	850,216
Time of $250 or more	55,745	16,965
Other time	151,664	152,692
Total deposits	1,894,529	1,810,813
Federal funds purchased	19,985	545
Subordinated notes, net	20,425	20,412
Federal Home Loan Bank advances, net	137,878	76,382
Long-term debt	27,040	22,917
Accrued expenses and other liabilities	5,688	5,210
Total liabilities	2,105,545	1,936,279
COMMITMENTS AND CONTINGENCIES (Note 16)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.01 par value; authorized 50,000,000 shares; no shares issued and outstanding at December 31, 2018 and 2017	0	0
Common stock, no par value; authorized 50,000,000 shares; 16,295,494 and 16,215,672 shares issued and outstanding at December 31, 2018 and 2017, respectively	3,000	3,000
Additional paid-in capital	25,128	23,463
Retained earnings	169,709	153,527
Accumulated other comprehensive loss	(6,814)	(1,892)
Total stockholders’ equity	191,023	178,098
Total liabilities and stockholders’ equity	$ 2,296,568	$ 2,114,377

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets [Abstract]
Investment securities held to maturity, fair value	$ 0	$ 45,890
Preferred Stock:
Preferred stock, par value ($ per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common Stock:
Common stock, no par value
Common stock, share authorized	50,000,000	50,000,000
Common stock, share issued	16,295,494	16,215,672
Common stock, shares outstanding	16,295,494	16,215,672

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans, including fees	$ 71,189	$ 63,242	$ 57,419
Investment securities:
Taxable	8,124	5,501	4,201
Tax-exempt	4,993	3,960	3,266
Federal funds sold	487	331	108
Total interest income	84,793	73,034	64,994
Interest expense:
Deposits	17,064	7,622	3,391
Federal funds purchased	188	99	47
Subordinated notes	1,076	901	728
Federal Home Loan Bank advances	3,650	3,836	3,565
Long-term debt	757	519	145
Total interest expense	22,735	12,977	7,876
Net interest income	62,058	60,057	57,118
Provision for loan losses	(250)	0	1,000
Net interest income after provision for loan losses	62,308	60,057	56,118
Noninterest income:
Increase in cash value of bank-owned life insurance	631	652	647
Gain from bank-owned life insurance	0	307	443
Realized investment securities gains (losses), net	(263)	326	66
Other income	1,241	1,272	1,230
Total noninterest income	7,752	8,648	7,982
Noninterest expense:
Salaries and employee benefits	18,791	17,633	16,731
Occupancy	4,996	4,406	4,033
Data processing	2,682	2,677	2,510
FDIC insurance	685	677	937
Professional fees	840	1,075	774
Director fees	1,014	950	888
Write-down of premises	333	0	0
Other expenses	5,651	4,849	5,275
Total noninterest expense	34,992	32,267	31,148
Income before income taxes	35,068	36,438	32,952
Income taxes	6,560	13,368	9,936
Net income	$ 28,508	$ 23,070	$ 23,016
Basic earnings per common share	$ 1.75	$ 1.42	$ 1.43
Diluted earnings per common share	$ 1.74	$ 1.41	$ 1.42
Deposit accounts [Member]
Noninterest income:
Revenue from contract with customer	$ 2,541	$ 2,632	$ 2,461
Debit cards [Member]
Noninterest income:
Revenue from contract with customer	1,681	1,754	1,825
Trust services [Member]
Noninterest income:
Revenue from contract with customer	$ 1,921	$ 1,705	$ 1,310

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 28,508	$ 23,070	$ 23,016
Total other comprehensive loss	(4,552)	(850)	(612)
Comprehensive income	23,956	22,220	22,404
Unrealized gains losses on securities [Member]
Unrealized holding gains (losses) arising during the period	(7,807)	(1,124)	(2,249)
Unrealized gains on investment securities transferred from held to maturity to available for sale	363	0	0
Less: reclassification adjustment for net (gains) losses realized in net income	263	(326)	(66)
Less: other reclassification adjustment	(36)	(268)	(128)
Income tax (expense) benefit	1,806	653	929
Other comprehensive income on available for sale securities, net of tax	(5,411)	(1,065)	(1,514)
Unrealized gains losses on derivatives [Member]
Unrealized holding gains (losses) on derivatives arising during the period	1,044	(66)	882
Plus: reclassification adjustment for net gain on derivatives realized in net income	10	304	464
Plus: reclassification adjustment for amortization of derivative termination costs, realized in interest expense	95	109	109
Income tax expense	(290)	(132)	(553)
Other comprehensive income on derivatives	$ 859	$ 215	$ 902

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2015	$ 152,377,000	$ 0	$ 3,000,000	$ 20,067,000	$ 129,740,000	$ (430,000)
Common stock, shares outstanding at Dec. 31, 2015			16,064,435
Stockholders' Equity [Roll Forward]
Net income	23,016,000	0	$ 0	0	23,016,000	0
Other comprehensive income (loss), net of tax	(612,000)	0	0	0	0	(612,000)
Cash dividends declared, common stock	(10,800,000)	0	0	0	(10,800,000)	0
Stock-based compensation costs	1,684,000	0	0	1,684,000	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(394,000)	0	$ 0	(394,000)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			73,564
Excess tax benefits from vesting of restricted stock units	105,000	0	$ 0	105,000	0	0
Balance at Dec. 31, 2016	165,376,000	0	$ 3,000,000	21,462,000	141,956,000	(1,042,000)
Common stock, shares outstanding at Dec. 31, 2016			16,137,999
Stockholders' Equity [Roll Forward]
Net income	23,070,000	0	$ 0	0	23,070,000	0
Other comprehensive income (loss), net of tax	(850,000)	0	0	0	0	(850,000)
Cash dividends declared, common stock	(11,499,000)	0	0	0	(11,499,000)	0
Stock-based compensation costs	2,632,000	0	0	2,632,000	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(631,000)	0	$ 0	(631,000)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			77,673
Balance at Dec. 31, 2017	$ 178,098,000	0	$ 3,000,000	23,463,000	153,527,000	(1,892,000)
Common stock, shares outstanding at Dec. 31, 2017	16,215,672		16,215,672
Stockholders' Equity [Roll Forward]
Net income	$ 28,508,000	0	$ 0	0	28,508,000	0
Reclassification of stranded tax effects	0	0	0	0		(370,000)
Other comprehensive income (loss), net of tax	(4,552,000)	0	0	0	0	(4,552,000)
Cash dividends declared, common stock	(12,696,000)	0	0	0	(12,696,000)	0
Stock-based compensation costs	2,741,000	0	0	2,741,000	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(1,076,000)	0	$ 0	(1,076,000)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			79,822
Balance at Dec. 31, 2018	$ 191,023,000	$ 0	$ 3,000,000	$ 25,128,000	$ 169,709,000	$ (6,814,000)
Common stock, shares outstanding at Dec. 31, 2018	16,295,494		16,295,494

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share	$ 0.78	$ 0.71	$ 0.67

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	$ 28,508	$ 23,070	$ 23,016
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	(250)	0	1,000
Net amortization and accretion	4,945	4,155	4,290
Investment securities (gains) losses, net	263	(326)	(66)
Stock-based compensation	2,741	2,632	1,684
Increase in cash value of bank-owned life insurance	(631)	(652)	(647)
Gain from bank-owned life insurance	0	(307)	(443)
Depreciation	1,408	1,347	1,046
Write-down of premises	333	0	0
Deferred income taxes	(359)	2,833	89
Change in assets and liabilities:
Increase in accrued interest receivable	(287)	(2,023)	(633)
(Increase) decrease in other assets	(2,490)	131	(85)
Increase (decrease) in accrued expenses and other liabilities	563	(1,503)	1,047
Net cash provided by operating activities	34,744	29,357	30,298
Cash Flows from Investing Activities:
Proceeds from sales of investment securities available for sale	75,401	108,584	3,054
Proceeds from maturities and calls of investment securities	45,937	47,781	58,358
Purchases of investment securities available for sale	(96,170)	(341,012)	(3,500)
Purchases of Federal Home Loan Bank stock	(16,334)	(19,414)	(17,407)
Proceeds from redemption of Federal Home Loan Bank stock	13,471	21,011	19,083
Net increase in loans	(210,821)	(110,312)	(153,037)
Purchases of premises and equipment	(210)	(1,055)	(12,802)
Proceeds of principal and earnings from bank-owned life insurance	0	452	812
Net cash used in investing activities	(188,726)	(293,965)	(105,439)
Cash Flows from Financing Activities:
Net increase in deposits	83,716	264,208	105,876
Net increase (decrease) in federal funds purchased	19,440	(9,145)	(12,070)
Proceeds from long-term debt	11,486	22,000	0
Proceeds from Federal Home Loan Bank advances	60,000	0	0
Principal payments on long-term debt	(7,363)	(4,212)	(3,286)
Principal payments on Federal Home Loan Bank advances	0	(25,000)	0
Common stock dividends paid	(12,696)	(11,499)	(10,800)
Restricted stock units withheld for payroll taxes	(1,076)	(631)	(394)
Net cash provided by financing activities	153,507	235,721	79,326
Net increase (decrease) in cash and cash equivalents	(475)	(28,887)	4,185
Cash and Cash Equivalents:
Beginning	47,949	76,836	72,651
Ending	47,474	47,949	76,836
Supplemental Disclosure of Cash Flow Information:
Interest	22,154	12,520	7,940
Income taxes	$ 7,312	$ 9,300	$ 7,870

Organization and Nature of Busi

Organization and Nature of Business and Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	Organization and Nature of Business and Summary of Significant Accounting Policies Organization and nature of business : West Bancorporation, Inc. operates in the commercial banking industry through its wholly-owned subsidiary, West Bank. West Bank is a state chartered bank and has its main office in West Des Moines, Iowa, with seven additional offices located in the Des Moines, Iowa, metropolitan area, one office located in Coralville, Iowa, and one office located in Rochester, Minnesota. As used herein, the term “Company” refers to West Bancorporation, Inc., or if the context dictates, West Bancorporation, Inc. and its subsidiary. Significant accounting policies : Accounting estimates and assumptions : The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) established by the Financial Accounting Standards Board (FASB). References to GAAP issued by the FASB in these footnotes are to the FASB Accounting Standards Codification TM , sometimes referred to as the Codification or ASC. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses for the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term are the fair value of financial instruments and the allowance for loan losses. Consolidation policy : The consolidated financial statements include the accounts of the Company, West Bank and West Bank’s special purpose subsidiaries (which facilitate an investment in new market tax credit activity in 2018) and WB Funding Corporation (which was liquidated in March 2018). All significant intercompany transactions and balances have been eliminated in consolidation. In addition, the Company owns an unconsolidated subsidiary, West Bancorporation Capital Trust I (the Trust), which was formed for the purpose of issuing trust preferred securities. In accordance with GAAP, the results of the Trust are recorded on the books of the Company using the equity method of accounting and are not consolidated. Segment information: An operating segment is generally defined as a component of a business for which discrete financial information is available and whose operating results are regularly reviewed by the chief operating decision-maker. As a community-oriented financial institution, substantially all of West Bank’s operations involve the delivery of loan and deposit products to customers. Management makes operating decisions and assesses performance based on an ongoing review of the community banking activities, which constitutes the Company’s only operating segment for financial reporting purposes. Comprehensive income : Comprehensive income consists of net income and other comprehensive income (OCI). OCI consists of the net change in unrealized gains and losses on the Company’s investment securities available for sale, including the noncredit-related portion of unrealized gains (losses) of other than temporarily impaired (OTTI) securities, if any, and the effective portion of the change in fair value of derivative instruments. OCI also includes the amortization of derivative termination costs and the amortization of unrealized gains on investment securities transferred from available for sale to held to maturity. Cash and cash equivalents and cash flows : For statement of cash flow purposes, the Company considers cash, due from banks and federal funds sold to be cash and cash equivalents. Cash inflows and outflows from loans, deposits and federal funds purchased are reported on a net basis. Investment securities : Investment securities that management has the intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Investment securities that may be sold for general liquidity needs, in response to market interest rate fluctuations, implementation of asset-liability management strategies, funding loan demand, changes in securities prepayment risk or other similar factors are classified as available for sale and reported at fair value, with unrealized gains and losses reported as a separate component of accumulated other comprehensive income (AOCI), net of deferred income taxes. Realized gains and losses on sales of investment securities are computed on a specific identification basis based on amortized cost. The amortized cost of debt securities classified as held to maturity or available for sale is adjusted for accretion of discounts to maturity and amortization of premiums over the estimated average life of each security or, in the case of callable securities, through the first call date, using the effective yield method. Such amortization and accretion is included in interest income. Interest income on securities is recognized using the interest method according to the terms of the investment security. The Company evaluates each of its investment securities whose value has declined below amortized cost to determine whether the decline in fair value is OTTI. When determining whether an investment security is OTTI, management assesses the severity and duration of the decline in fair value, the length of time expected for recovery, the financial condition of the issuer and other qualitative factors, as well as whether: (a) it has the intent to sell the security, and (b) it is more likely than not that it will be required to sell the security prior to its anticipated recovery. In instances when a determination is made that an OTTI exists but management does not intend to sell the security and it is not more likely than not that it will be required to sell the security prior to its anticipated repayment or maturity, the OTTI is separated into: (a) the amount of the total OTTI related to a decrease in cash flows expected to be collected from the security (the credit loss); and (b) the amount of the total OTTI related to all other factors. The amount of the total OTTI related to the credit loss is recognized as a charge to earnings. The amount of the total OTTI related to all other factors is recognized in OCI. If the Company intends to sell or it is more likely than not that it will be required to sell a security with OTTI before recovery of its amortized cost basis, the OTTI is recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. Federal Home Loan Bank stock : West Bank, as a member of the Federal Home Loan Bank (FHLB) system, is required to maintain an investment in capital stock of the FHLB in an amount equal to 0.12 percent of total assets plus 4.00 percent of outstanding advances from the FHLB and the outstanding principal balance of loans previously issued through the Mortgage Partnership Finance Program (MPF). No ready market exists for the FHLB stock, and it has no quoted market value. The Company evaluates this asset for impairment on a quarterly basis and determined there was no impairment as of December 31, 2018 . All shares of FHLB stock are issued and redeemed at par value. Loans : Loans are stated at the principal amounts outstanding, net of unamortized loan fees and costs, with interest income recognized on the interest method based upon the terms of the loan. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield using the interest method. Loans are reported by the portfolio segments identified and are analyzed by management on this basis. All loan policies identified below apply to all segments of the loan portfolio. Delinquencies are determined based on the payment terms of the individual loan agreements. The accrual of interest on past due and other impaired loans is generally discontinued at 90 days past due or when, in the opinion of management, the borrower may be unable to make all payments pursuant to contractual terms. Unless considered collectible, all interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income, if accrued in the current year, or charged to the allowance for loan losses, if accrued in the prior year. Generally, all payments received while a loan is on nonaccrual status are applied to the principal balance of the loan. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured. A loan is classified as troubled debt restructured (TDR) when the Company separately concludes that a borrower is experiencing financial difficulties and a concession is granted that would not otherwise be considered. Concessions may include a restructuring of the loan terms to alleviate the burden of the borrower’s cash requirements, such as an extension of the payment terms beyond the original maturity date or a change in the interest rate charged. TDR loans with extended payment terms are accounted for as impaired until performance is established. A change to the interest rate would change the classification of a loan to a TDR loan if the restructured loan yields a rate that is below a market rate for that of a new loan with comparable risk. TDR loans with below market rates are considered impaired until fully collected. TDR loans may also be reported as nonaccrual or 90 days past due if they are not performing per the restructured terms. Based upon its ongoing assessment of credit quality within the loan portfolio, the Company maintains a Watch List, which includes loans classified as Doubtful, Substandard and Watch according to the Company’s classification criteria. These loans involve the anticipated potential for payment defaults or collateral inadequacies. A loan on the Watch List is considered impaired when management believes it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with 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, as a practical expedient, at the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. The amount of impairment, if any, and any subsequent changes are included in the allowance for loan losses. Allowance for loan losses : The allowance for loan losses is established through a provision for loan losses charged to expense. The allowance is an amount that management believes will be adequate to absorb probable losses on existing loans based on an evaluation of the collectability of loans and prior loss experience. This evaluation also takes into consideration such factors as changes in the nature and volume of the loan portfolio, overall portfolio quality, the review of specific problem loans, and current economic conditions that may affect the borrowers’ ability to pay. Loans are charged off against the allowance for loan losses when management believes that collectability of the principal is unlikely. While management uses the best information available to make its evaluations, future adjustments to the allowance may be necessary if there are significant changes in economic conditions or the other factors relied upon. The allowance for loan losses consists of specific and general components. The specific component relates to loans that meet the definition of impaired. The general component covers the remaining loans and is based on historical loss experience adjusted for qualitative factors such as delinquency trends, loan growth, economic elements and local market conditions. These same policies are applied to all segments of loans. In addition, regulatory agencies, as integral parts of their examination processes, periodically review the Company’s allowance for loan losses, and may require the Company to make additions to the allowance based on their judgment about information available to them at the time of their examinations. Premises and equipment : Premises and equipment are stated at cost less accumulated depreciation. The straight-line method of depreciation and amortization is used for calculating expense. The estimated useful lives of premises and equipment range up to 40 years for buildings, up to 10 years for furniture and equipment, and the shorter of the estimated useful life or lease term for leasehold improvements. Other real estate owned : Real estate properties acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. Fair value is determined by management by obtaining appraisals or other market value information at the time of foreclosure. Any write-downs in value at the date of acquisition are charged to the allowance for loan losses. After foreclosure, valuations are periodically performed by management by obtaining updated appraisals or other market value information at least annually. Any subsequent write-downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the updated fair value less estimated selling cost. Net costs related to the holding of properties are included in noninterest expense. As of December 31, 2018 and 2017 , the Company had no other real estate owned. Trust assets : Assets held by West Bank in fiduciary or agency capacities, other than trust cash on deposit at West Bank, are not included in the consolidated balance sheets of the Company, as such assets are not assets of West Bank. The Company managed or administered accounts with assets totaling $300,722 as of December 31, 2018 , compared to assets totaling $306,974 as of December 31, 2017 . Bank-owned life insurance : The carrying amount of bank-owned life insurance consists of the initial premium paid, plus increases in cash value, less the carrying amount associated with any death benefit received. Death benefits paid in excess of the applicable carrying amount are recognized as income. Increases in cash value and the portion of death benefits recognized as income are exempt from income taxes. Derivatives: The Company uses derivative financial instruments (which consist of interest rate swaps) to assist in its interest rate risk management. All derivatives are measured and reported at fair value on the Company’s consolidated balance sheet as other assets or other liabilities. The Company records cash flow hedges at the inception of the derivative contract based on the Company’s intentions and belief as to likely effectiveness as a hedge. The Company documents the strategy for entering into the transactions and the method of assessing ongoing effectiveness. Cash flow hedges represent a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability. For a cash flow hedge that is effective, 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. The changes in the fair value of derivatives that are not highly effective in hedging the changes in expected cash flows of the hedged item are recognized immediately in current earnings. All of the Company’s cash flow hedges qualify for hedge accounting and are considered highly effective. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged. To determine fair value, the Company uses third party pricing models that incorporate assumptions about market conditions and risks that are current at the reporting date. The Company does not use derivative instruments for trading or speculative purposes. The Company formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in 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 noninterest income. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods in which the hedged transactions will affect earnings. Stock-based compensation: The Company’s current and previous equity incentive plans were approved by the stockholders as a means to attract, retain and reward selected participants. The plans are administered by the Compensation Committee of the Board of Directors. Compensation expense for stock-based awards is recognized on a straight-line basis over the vesting period, or until the participant reaches full retirement age if less than the vesting period, using the fair value of the award at the time of the grant. The restricted stock unit (RSU) participants do not have dividend rights prior to vesting, so the fair value of nonvested RSUs is equal to the fair market value of the underlying common stock at the grant date, reduced by the present value of the dividends expected to be paid on the underlying shares during the vesting period. Prior to January 1, 2017, the Company assumed no projected forfeitures on its stock-based compensation, since all RSUs were expected to vest and no forfeitures had occurred as of December 31, 2016. Upon adoption of ASU No. 2016-09, Compensation - Stock Compensation (Topic 718) on January 1, 2017, the Company made the accounting policy election to account for forfeitures as they occur. Deferred compensation: The West Bancorporation, Inc. Deferred Compensation Plan (the Deferred Compensation Plan) provides certain individuals with additional deferral opportunities in planning for retirement. Eligible participants, including directors and key officers of the Company, may choose to voluntarily defer receipt of a portion of their respective cash compensation. The Deferred Compensation Plan is an unfunded, nonqualified deferred compensation plan intended to conform to the requirements of Section 409A of the Internal Revenue Code. As of December 31, 2018 , no individuals had chosen to participate in the Plan. Transfer of financial assets : Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right, free of conditions that constrain it from taking advantage of that right, to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Income taxes : The Company files a consolidated federal income tax return. Income tax expense is generally allocated as if the Company and its subsidiary file separate income tax returns. Deferred taxes are provided on an asset and liability method whereby deferred tax assets are recognized for deductible temporary differences, capital losses and net operating losses, and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax basis. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. When tax returns are filed, it is highly certain that some tax positions taken will be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the positions taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the consolidated financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. The evaluation of a tax position taken is considered by itself and is not offset or aggregated with other positions. Tax positions that meet the more likely than not recognition threshold are measured as the largest amount of tax benefit that is more than 50 percent likely of being realized upon settlement with the applicable taxing authority. Management does not believe the Company has any material uncertain tax positions to disclose. Interest and penalties, if any, related to income taxes are recorded as other noninterest expense in the consolidated income statements in the year assessed. Earnings per common share : Basic earnings per common share are computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per common share reflect the potential dilution that could occur if the Company’s outstanding RSUs were vested. The dilutive effect is computed using the treasury stock method, which assumes all stock-based awards were exercised and the hypothetical proceeds from exercise were used by the Company to purchase common stock at the average market price during the period. Current accounting developments : In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the Codification. The core principle is that a company should recognize revenue to depict the transfer of promised goods and services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. For public companies, this update was effective for interim and annual periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method. The implementation of the new standard did not result in a change to the accounting for any in-scope revenue streams; as such, no cumulative effect adjustment to opening retained earnings was recorded. The Company's revenue is primarily composed of interest income on financial instruments, including investment securities and loans, which are excluded from the scope of Topic 606. Also excluded from the scope of the update is revenue from bank-owned life insurance, loan fees and letter of credit fees. Approximately 90 percent of the Company’s revenue is outside the scope of this update. Topic 606 is applicable to deposit account related fees, including general service fees charged for deposit account maintenance and activity and transaction-based fees charged for certain services, such as debit card, wire transfer or overdraft activities. Revenue is recognized when the performance obligation is completed, which is generally after a transaction is completed or monthly for account maintenance services. Topic 606 is also applicable to trust services, which include periodic fees earned from trusts and investment management agency accounts, estate administration, custody accounts, individual retirement accounts, and other related services. Fees are charged based on standard agreements or by statute and are recognized over the period of time the Company provides the contracted services. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The update enhances the reporting model for financial instruments to provide users of financial statements with more decision-useful information by updating certain aspects of recognition, measurement, presentation and disclosure of financial instruments. Among other changes, the update requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, and clarifies that entities should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entities' other deferred tax assets. For public companies, this update was effective for interim and annual periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method. Upon adoption, the fair value of the Company’s loan portfolio is now presented using an exit price method. Also, the Company is no longer required to disclose the methodologies used for estimating fair value of financial assets and liabilities that are not measured at fair value on a recurring or nonrecurring basis. The remaining requirements of this update did not have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The guidance in the update supersedes the requirements in ASC Topic 840, Leases. The guidance is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for leases with terms of more than 12 months. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2018. In July 2018, the FASB issued ASU No. 2018-11, Targeted Improvements, which amends ASC 842, Leases to provide for an adoption option that will not require earlier periods to be restated at the adoption date. The Company currently leases its main location and space for six other branch offices and operational departments under operating leases that will result in recognition of lease assets and lease liabilities on the consolidated balance sheets under the updates. The Company adopted this guidance effective January 1, 2019 and recorded a right-of-use asset of $9,604 and lease liability of $9,841 . In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326). The amendments in this update require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected on the financial assets. Under the updates, the income statement will reflect the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount of financial assets. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination that are measured at amortized cost basis is determined in a similar manner to other financial assets measured at amortized cost basis; however, the initial allowance for credit losses is added to the purchase price rather than being reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for these assets. Off-balance-sheet arrangements such as commitments to extend credit, guarantees, and standby letters of credit that are not considered derivatives under ASC 815 and are not unconditionally cancellable are also within the scope of this update. Credit losses relating to available for sale debt securities should be recorded through an allowance for credit losses. For public companies, the update is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. All entities may adopt the amendments in this update earlier as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply the amendments in this update on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company does not plan to early adopt this standard, but is working through implementation. The Company continues collecting and retaining historical loan and credit data and is currently evaluating various loss estimation models. While we currently cannot reasonably estimate the impact of adopting this standard, we expect the impact will be influenced by the composition, characteristics and quality of our loan and securities portfolios, as well as the general economic conditions and forecasts as of the adoption date. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . The amendments in this update make targeted changes to the existing hedge accounting model to better align the accounting rules with a company’s risk management activities, and to simplify the application of the hedge accounting model. The update expands the types of transactions eligible for hedge accounting, eliminates the requirement to separately measure and present hedge ineffectiveness, and simplifies the way assessments of hedge ineffectiveness may be performed. The update also permits a one-time reclassification of prepayable debt securities from held to maturity classification to available for sale. For public companies, the update is effective for annual periods beginning after December 15, 2018, with early adoption permitted, including in an interim period. The amendments’ presentation and disclosure guidance is required on a prospective basis. The Company adopted the guidance effective January 1, 2018. The requirements of this update related to the Company’s hedging activities did not have any impact on the Company’s consolidated financial statements. Upon adoption, the Company elected to transfer all its held to maturity securities portfolio to available for sale. The transferred securities had an amortized cost basis of $45,527 and a fair value of $45,890 . Upon transfer, the Company recorded an adjustment of $273 to accumulated other comprehensive income (loss), net of deferred income taxes, for the unrealized gains and losses related to the transferred securities. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendment in this update allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 22, 2017, enactment of Public Law 115-97, commonly known as the Tax Cut and Jobs Act (Tax Act), which reduced the federal corporate income tax rate and became effective in 2018. For public companies, the update is effective for annual periods beginning after December 15, 2018, with early ado

Earnings per Common Share (Note

Earnings per Common Share (Notes)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings per Common Share The calculation of earnings per common share and diluted earnings per common share is presented below for the years ended December 31, 2018 , 2017 and 2016 . (in thousands, except per share data) 2018 2017 2016 Net income $ 28,508 $ 23,070 $ 23,016 Weighted average common shares outstanding 16,275 16,194 16,117 Weighted average effect of restricted stock units outstanding 125 141 54 Diluted weighted average common shares outstanding 16,400 16,335 16,171 Basic earnings per common share $ 1.75 $ 1.42 $ 1.43 Diluted earnings per common share $ 1.74 $ 1.41 $ 1.42 Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation 103 — 102

Investment securities (Notes)

Investment securities (Notes)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities Disclosure [Text Block]	Investment Securities The following tables show the amortized cost, gross unrealized gains and losses and fair value of investment securities, by investment security type as of December 31, 2018 and 2017 . 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities available for sale: State and political subdivisions $ 152,293 $ 156 $ (3,293 ) $ 149,156 Collateralized mortgage obligations (1) 161,392 — (4,388 ) 157,004 Mortgage-backed securities (1) 64,813 — (1,435 ) 63,378 Asset-backed securities (2) 32,076 2 (175 ) 31,903 Trust preferred security 2,153 — (253 ) 1,900 Corporate notes 51,862 124 (1,569 ) 50,417 $ 464,589 $ 282 $ (11,113 ) $ 453,758 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities available for sale: State and political subdivisions $ 146,331 $ 928 $ (946 ) $ 146,313 Collateralized mortgage obligations (1) 162,631 28 (2,727 ) 159,932 Mortgage-backed securities (1) 60,956 20 (547 ) 60,429 Asset-backed securities (2) 45,539 8 (352 ) 45,195 Trust preferred security 2,134 — (128 ) 2,006 Corporate notes 30,278 331 (265 ) 30,344 $ 447,869 $ 1,315 $ (4,965 ) $ 444,219 Securities held to maturity: State and political subdivisions $ 45,527 $ 460 $ (97 ) $ 45,890 (1) All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities and real estate mortgage investment conduits guaranteed by FNMA, FHLMC or GNMA, and commercial mortgage pass-through securities guaranteed by the SBA. (2) Pass-through asset-backed securities guaranteed by the SBA, representing participating interests in pools of commercial working capital and equipment loans. Investment securities with an amortized cost of approximately $126,531 and $120,338 as of December 31, 2018 and 2017 , respectively, were pledged to secure access to the Federal Reserve discount window, for public fund deposits, and for other purposes as required or permitted by law or regulation. The amortized cost and fair value of investment securities available for sale as of December 31, 2018 , by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity. Expected maturities may differ from contractual maturities for collateralized mortgage obligations, mortgage-backed securities and asset-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, collateralized mortgage obligations, mortgage-backed securities and asset-backed securities are not included in the maturity categories within the following maturity summary. 2018 Amortized Cost Fair Value Due after one year through five years $ 3,371 $ 3,337 Due after five years through ten years 81,619 79,870 Due after ten years 121,318 118,266 206,308 201,473 Collateralized mortgage obligations, mortgage-backed and asset-backed securities 258,281 252,285 $ 464,589 $ 453,758 The details of the sales of investment securities for the years ended December 31, 2018 , 2017 and 2016 are summarized in the following table. 2018 2017 2016 Proceeds from sales $ 75,401 $ 108,584 $ 3,054 Gross gains on sales 101 752 66 Gross losses on sales 364 426 — The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of December 31, 2018 and 2017 . 2018 Less than 12 months 12 months or longer Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Securities available for sale: State and political subdivisions $ 21,264 $ (221 ) $ 102,853 $ (3,072 ) $ 124,117 $ (3,293 ) Collateralized mortgage obligations 32,230 (250 ) 124,775 (4,138 ) 157,005 (4,388 ) Mortgage-backed securities 10,960 (103 ) 51,823 (1,332 ) 62,783 (1,435 ) Asset-backed securities 6,668 (31 ) 16,486 (144 ) 23,154 (175 ) Trust preferred security — — 1,900 (253 ) 1,900 (253 ) Corporate notes 19,470 (611 ) 19,041 (958 ) 38,511 (1,569 ) $ 90,592 $ (1,216 ) $ 316,878 $ (9,897 ) $ 407,470 $ (11,113 ) 2017 Less than 12 months 12 months or longer Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Securities available for sale: State and political subdivisions $ 86,750 $ (946 ) $ — $ — $ 86,750 $ (946 ) Collateralized mortgage obligations 107,526 (1,583 ) 46,396 (1,144 ) 153,922 (2,727 ) Mortgage-backed securities 53,974 (547 ) — — 53,974 (547 ) Asset-backed securities 38,652 (352 ) — — 38,652 (352 ) Trust preferred security — — 2,006 (128 ) 2,006 (128 ) Corporate notes 14,735 (265 ) — — 14,735 (265 ) $ 301,637 $ (3,693 ) $ 48,402 $ (1,272 ) $ 350,039 $ (4,965 ) Securities held to maturity: State and political subdivisions $ 12,611 $ (70 ) $ 1,740 $ (27 ) $ 14,351 $ (97 ) As of December 31, 2018 , the available for sale investment securities with unrealized losses included 171 state and political subdivision securities, 45 collateralized mortgage obligations, 18 mortgage-backed securities, six asset-backed securities, one trust preferred security and 15 corporate notes. The Company believes the unrealized losses on investment securities available for sale as of December 31, 2018 were due to market conditions, including interest rate fluctuations, rather than reduced estimated cash flows. The Company does not intend to sell these securities, does not anticipate that these securities will be required to be sold before anticipated recovery, and expects full principal and interest to be collected. Therefore, the Company does not consider these investments to have OTTI as of December 31, 2018 .

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses (Notes)	12 Months Ended
	Dec. 31, 2018
Loans and Allowance for Loan Losses [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Loans and Allowance for Loan Losses Loans consisted of the following segments as of December 31, 2018 and 2017 . 2018 2017 Commercial $ 358,763 $ 347,482 Real estate: Construction, land and land development 245,810 207,451 1-4 family residential first mortgages 49,052 51,044 Home equity 14,469 13,811 Commercial 1,050,025 886,114 Consumer and other 6,211 6,363 1,724,330 1,512,265 Net unamortized fees and costs (2,500 ) (1,765 ) $ 1,721,830 $ 1,510,500 The loan portfolio included $1,142,413 and $997,642 of fixed-rate loans and $581,917 and $514,623 of variable-rate loans as of December 31, 2018 and 2017 , respectively. Real estate loans of approximately $800,000 and $810,000 were pledged as security for FHLB advances as of December 31, 2018 and 2017 , respectively. The Company has had, and may be expected to have in the future, banking transactions in the ordinary course of business with directors, executive officers, their immediate families, and affiliated companies in which they are principal stockholders or executive officers (commonly referred to as related parties), all of which have been originated, in the opinion of management, on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated parties. Loan transactions with related parties were as follows for the years ended December 31, 2018 and 2017 . 2018 2017 Balance, beginning of year $ 165,097 $ 191,697 New loans 9,387 28,975 Repayments (21,008 ) (55,575 ) Balance, end of year $ 153,476 $ 165,097 The following table summarizes the recorded investment in impaired loans by segment, broken down by loans with no related allowance and loans with a related allowance and the amount of that allowance as of December 31, 2018 and 2017 . December 31, 2018 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: Commercial $ 1,014 $ 1,014 $ — $ — $ — $ — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages 106 106 — 91 91 — Home equity 41 41 — 172 172 — Commercial 652 652 — 220 220 — Consumer and other — — — — — — 1,813 1,813 — 483 483 — With an allowance recorded: Commercial 15 15 15 — — — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages — — — — — — Home equity — — — 21 21 21 Commercial 100 100 100 118 118 118 Consumer and other — — — — — — 115 115 115 139 139 139 Total: Commercial 1,029 1,029 15 — — — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages 106 106 — 91 91 — Home equity 41 41 — 193 193 21 Commercial 752 752 100 338 338 118 Consumer and other — — — — — — Total impaired loans $ 1,928 $ 1,928 $ 115 $ 622 $ 622 $ 139 The balance of impaired loans at December 31, 2018 was composed of loans to ten different borrowers, and the balance of impaired loans at December 31, 2017 was composed of loans to five different borrowers. As of December 31, 2018 , $250 of total impaired loans to four of the borrowers was also considered impaired as of December 31, 2017 . The Company has no commitments to advance additional funds on any of the impaired loans. The following table summarizes the average recorded investment and interest income recognized on impaired loans by segment for the years ended December 31, 2018 , 2017 and 2016 . December 31, 2018 December 31, 2017 December 31, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial $ 738 $ — $ 19 $ — $ 3 $ — Real estate: Construction, land and land development — — — — 8 — 1-4 family residential first mortgages 113 — 99 — 212 1 Home equity 122 6 39 2 3 — Commercial 600 — 276 — 393 — Consumer and other — — — — — — 1,573 6 433 2 619 1 With an allowance recorded: Commercial 1 — 60 7 127 — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages — — — — — — Home equity 15 — 177 1 263 — Commercial 109 — 127 — 145 — Consumer and other — — — — — — 125 — 364 8 535 — Total: Commercial 739 — 79 7 130 — Real estate: Construction, land and land development — — — — 8 — 1-4 family residential first mortgages 113 — 99 — 212 1 Home equity 137 6 216 3 266 — Commercial 709 — 403 — 538 — Consumer and other — — — — — — Total impaired loans $ 1,698 $ 6 $ 797 $ 10 $ 1,154 $ 1 Interest income forgone on impaired loans was $96 , $47 and $72 , respectively, during the years ended December 31, 2018 , 2017 and 2016 . The following tables provide an analysis of the payment status of the recorded investment in loans as of December 31, 2018 and 2017 . December 31, 2018 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Total Past Due Current Nonaccrual Loans Total Loans Commercial $ 54 $ — $ — $ 54 $ 357,680 $ 1,029 $ 358,763 Real estate: Construction, land and land development — — — — 245,810 — 245,810 1-4 family residential first mortgages 157 — — 157 48,789 106 49,052 Home equity — — — — 14,428 41 14,469 Commercial — — — — 1,049,273 752 1,050,025 Consumer and other — — — — 6,211 — 6,211 Total $ 211 $ — $ — $ 211 $ 1,722,191 $ 1,928 $ 1,724,330 December 31, 2017 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Total Past Due Current Nonaccrual Loans Total Loans Commercial $ 40 $ 20 $ — $ 60 $ 347,422 $ — $ 347,482 Real estate: Construction, land and land development — — — — 207,451 — 207,451 1-4 family residential first mortgages — 75 — 75 50,878 91 51,044 Home equity — — — — 13,618 193 13,811 Commercial — — — — 885,776 338 886,114 Consumer and other — — — — 6,363 — 6,363 Total $ 40 $ 95 $ — $ 135 $ 1,511,508 $ 622 $ 1,512,265 TDR loans totaled $652 and $220 as of December 31, 2018 and 2017 , respectively, and were included in the nonaccrual category. There was one loan modification considered to be TDR that occurred during the year ended December 31, 2018 and no loan modifications considered to be TDR that occurred during the years ended December 31, 2017 and 2016 . The pre- and post-modification recorded investment in TDR loans that have occurred during the years ended December 31, 2018 , 2017 and 2016 , totaled $560 , $0 and $0 , respectively. The financial impact of charge-offs or specific reserves for these modified loans was immaterial. TDR loans that have been modified within the twelve months ended December 31, 2018 , 2017 and 2016 , which have subsequently had a payment default, totaled $544 , $0 and $0 , respectively. A TDR loan is considered to have a payment default when it is past due 30 days or more. The following tables show the recorded investment in loans by credit quality indicator and loan segment as of December 31, 2018 and 2017 . December 31, 2018 Pass Watch Substandard Doubtful Total Commercial $ 336,861 $ 19,886 $ 2,016 $ — $ 358,763 Real estate: Construction, land and land development 245,810 — — — 245,810 1-4 family residential first mortgages 47,923 963 166 — 49,052 Home equity 14,352 46 71 — 14,469 Commercial 1,019,256 29,063 1,706 — 1,050,025 Consumer and other 6,186 — 25 — 6,211 Total $ 1,670,388 $ 49,958 $ 3,984 $ — $ 1,724,330 December 31, 2017 Pass Watch Substandard Doubtful Total Commercial $ 344,586 $ 901 $ 1,995 $ — $ 347,482 Real estate: Construction, land and land development 206,719 732 — — 207,451 1-4 family residential first mortgages 49,905 890 249 — 51,044 Home equity 13,466 54 291 — 13,811 Commercial 856,789 20,574 8,751 — 886,114 Consumer and other 6,327 36 — — 6,363 Total $ 1,477,792 $ 23,187 $ 11,286 $ — $ 1,512,265 All loans are subject to the assessment of a credit quality indicator. Risk ratings are assigned for each loan at the time of approval, and they change as circumstances dictate during the term of the loan. The Company utilizes a 9-point risk rating scale as shown below, with ratings 1 - 5 included in the Pass column, rating 6 included in the Watch column, ratings 7 - 8 included in the Substandard column, and rating 9 included in the Doubtful column. All loans classified as impaired that are included in the specific evaluation of the allowance for loan losses are included in the Substandard column along with all other loans with ratings of 7 - 8. Risk rating 1: The loan is secured by cash equivalent collateral. Risk rating 2: The loan is secured by properly margined marketable securities, bonds or cash surrender value of life insurance. Risk rating 3: The borrower is in strong financial condition and has strong debt service capacity. The loan is performing as agreed, and the financial characteristics and trends of the borrower exceed industry statistics. Risk rating 4: The borrower’s financial condition is satisfactory and stable. The borrower has satisfactory debt service capacity, and the loan is well secured. The loan is performing as agreed, and the financial characteristics and trends fall in line with industry statistics. Risk rating 5: The borrower’s financial condition is less than satisfactory. The loan is still generally paying as agreed, but strained cash flow may cause some slowness in payments. The collateral values adequately preclude loss on the loan. Financial characteristics and trends lag industry statistics. There may be noncompliance with loan covenants. Risk rating 6: The borrower’s financial condition is deficient. Payment delinquencies may be more common. Collateral values still protect from loss, but margins are narrow. The loan may be reliant on secondary sources of repayment, including liquidation of collateral and guarantor support. Risk rating 7: The loan is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Well-defined weaknesses exist that jeopardize the liquidation of the debt. The Company is inadequately protected by the valuation or paying capacity of the collateral pledged. If deficiencies are not corrected, there is a distinct possibility that a loss will be sustained. Risk rating 8: All the characteristics of rating 7 exist with the added condition that the loan is past due more than 90 days or there is reason to believe the Company will not receive its principal and interest according to the terms of the loan agreement. Risk rating 9: All the weaknesses inherent in risk ratings 7 and 8 exist with the added condition that collection or liquidation, on the basis of currently known facts, conditions and values, is highly questionable and improbable. A loan reaching this category would most likely be charged off. Credit quality indicators for all loans and the Company’s risk rating process are dynamic and updated on a continuous basis. Risk ratings are updated as circumstances that could affect the repayment of an individual loan are brought to management’s attention through an established monitoring process. Individual lenders initiate changes as appropriate for ratings 1 through 5, and changes for ratings 6 through 9 are initiated via communications with management. The likelihood of loss increases as the risk rating increases and is generally preceded by a loan appearing on the Watch List, which consists of all loans with a risk rating of 6 or worse. Written action plans with firm target dates for resolution of identified problems are maintained and reviewed on a quarterly basis for all segments of loans included on the Watch List. In addition to the Company’s internal credit monitoring practices and procedures, an outsourced independent credit review function is in place to further assess assigned internal risk classifications and monitor compliance with internal lending policies and procedures. In all portfolio segments, the primary risks are that a borrower’s income stream diminishes to the point that it is not able to make scheduled principal and interest payments and any collateral securing the loan declines in value. The risk of declining collateral values is present for most types of loans. Commercial loans consist primarily of loans to businesses for various purposes, including revolving lines to finance current operations, inventory and accounts receivable, and capital expenditure loans to finance equipment and other fixed assets. These loans generally have short maturities, have either adjustable or fixed interest rates, and are either unsecured or secured by inventory, accounts receivable and/or fixed assets. For commercial loans, the primary source of repayment is from the operation of the business. Real estate loans include various types of loans for which the Company holds real property as collateral, and consist of loans on commercial properties and single and multifamily residences. Real estate loans are typically structured to mature or reprice every 5 to 10 years with payments based on amortization periods up to 30 years. The majority of construction loans are to contractors and developers for construction of commercial buildings or residential real estate. These loans typically have maturities up to 24 months. The Company’s loan policy includes minimum appraisal and other credit guidelines. Consumer loans include loans extended to individuals for household, family and other personal expenditures not secured by real estate. The majority of the Company’s consumer lending is for vehicles, consolidation of personal debts and household improvements. The repayment source for consumer loans, including 1-4 family residential mortgages and home equity loans, is typically wages. The following tables detail changes in the allowance for loan losses by segment for the years ended December 31, 2018 , 2017 and 2016 . 2018 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 3,866 $ 2,213 $ 319 $ 186 $ 9,770 $ 76 $ 16,430 Charge-offs (208 ) — — (24 ) — (3 ) (235 ) Recoveries 673 — 18 24 13 16 744 Provision (1) (823 ) 171 (87 ) (15 ) 518 (14 ) (250 ) Ending balance $ 3,508 $ 2,384 $ 250 $ 171 $ 10,301 $ 75 $ 16,689 2017 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 3,881 $ 2,639 $ 317 $ 478 $ 8,697 $ 100 $ 16,112 Charge-offs (199 ) — — (176 ) — — (375 ) Recoveries 232 398 15 28 13 7 693 Provision (1) (48 ) (824 ) (13 ) (144 ) 1,060 (31 ) — Ending balance $ 3,866 $ 2,213 $ 319 $ 186 $ 9,770 $ 76 $ 16,430 2016 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 4,369 $ 2,338 $ 508 $ 481 $ 7,254 $ 17 $ 14,967 Charge-offs (125 ) (141 ) (93 ) — — (47 ) (406 ) Recoveries 218 217 59 36 13 8 551 Provision (1) (581 ) 225 (157 ) (39 ) 1,430 122 1,000 Ending balance $ 3,881 $ 2,639 $ 317 $ 478 $ 8,697 $ 100 $ 16,112 (1) The negative provisions for the various segments are either related to the decline in outstanding balances in each of those portfolio segments during the time periods disclosed and/or improvement in the credit quality factors related to those portfolio segments. The following tables show a breakdown of the allowance for loan losses disaggregated on the basis of impairment analysis method by segment as of December 31, 2018 and 2017 . December 31, 2018 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 15 $ — $ — $ — $ 100 $ — $ 115 Collectively evaluated for impairment 3,493 2,384 250 171 10,201 75 16,574 Total $ 3,508 $ 2,384 $ 250 $ 171 $ 10,301 $ 75 $ 16,689 December 31, 2017 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ — $ — $ — $ 21 $ 118 $ — $ 139 Collectively evaluated for impairment 3,866 2,213 319 165 9,652 76 16,291 Total $ 3,866 $ 2,213 $ 319 $ 186 $ 9,770 $ 76 $ 16,430 The following tables show the recorded investment in loans, exclusive of unamortized fees and costs, disaggregated on the basis of impairment analysis method by segment as of December 31, 2018 and 2017 . December 31, 2018 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 1,029 $ — $ 106 $ 41 $ 752 $ — $ 1,928 Collectively evaluated for impairment 357,734 245,810 48,946 14,428 1,049,273 6,211 1,722,402 Total $ 358,763 $ 245,810 $ 49,052 $ 14,469 $ 1,050,025 $ 6,211 $ 1,724,330 December 31, 2017 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ — $ — $ 91 $ 193 $ 338 $ — $ 622 Collectively evaluated for impairment 347,482 207,451 50,953 13,618 885,776 6,363 1,511,643 Total $ 347,482 $ 207,451 $ 51,044 $ 13,811 $ 886,114 $ 6,363 $ 1,512,265

Premises and Equipment, Net (No

Premises and Equipment, Net (Notes)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Premises and Equipment, Net Premises and equipment consisted of the following as of December 31, 2018 and 2017 . 2018 2017 Land $ 4,323 $ 4,323 Buildings 14,120 14,423 Leasehold improvements 3,941 3,880 Furniture and equipment 7,927 7,946 30,311 30,572 Accumulated depreciation (8,820 ) (7,550 ) $ 21,491 $ 23,022

Deposits (Notes)

Deposits (Notes)	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	Deposits The scheduled maturities of time deposits were as follows as of December 31, 2018 . 2019 $ 161,204 2020 26,598 2021 9,279 2022 6,091 2023 4,237 $ 207,409 Time deposits as of December 31, 2018 and 2017 , included $92,315 and $100,091 , respectively, of Certificate of Deposit Account Registry Service deposits, which is a program that coordinates, on a reciprocal basis, a network of banks to spread deposits exceeding the FDIC insurance coverage limits out to numerous institutions in order to provide insurance coverage for all participating deposits. Also included in total deposits as of December 31, 2018 and 2017 , were $94,203 and $117,990 , respectively, of Insured Cash Sweep (ICS) interest-bearing checking and $232,146 and $213,587 , respectively, of ICS money market deposits. These are also reciprocal programs providing insurance coverage for all participating deposits.

Subordinated Notes (Notes)

Subordinated Notes (Notes)	12 Months Ended
	Dec. 31, 2018
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Subordinated Borrowings Disclosure [Text Block]	Subordinated Notes On July 18, 2003, the Company issued $20,619 in junior subordinated debentures to the Company’s subsidiary trust, West Bancorporation Capital Trust I. The junior subordinated debentures are senior to the Company’s common stock. As a result, the Company must make payments on the junior subordinated debentures (and the related trust preferred securities) before any dividends can be paid on its common stock, and, in the event of the Company’s bankruptcy, dissolution or liquidation, the holders of the debentures must be satisfied before any distribution can be made to the holders of the common stock. The Company has the right to defer distributions on the junior subordinated debentures (and the related trust preferred securities) for up to five years , during which time no dividends may be paid to holders of the Company’s common stock. The junior subordinated debentures have a 30-year term, do not require any principal amortization, and are callable at the issuer’s option. The interest rate is a variable rate based on the 3-month LIBOR plus 3.05 percent . At December 31, 2018 , the interest rate was 5.85 percent . Interest is payable quarterly , unless deferred. The Company has never deferred an interest payment. The effective cost of the junior subordinated debentures at December 31, 2018 , including amortization of issuance costs, was 5.92 percent . Holders of the trust preferred securities associated with the junior subordinated debentures have no voting rights, are unsecured, and rank junior in priority to all the Company’s indebtedness and senior to the Company’s common stock. The junior subordinated debentures are reported net of unamortized debt issuance costs of $194 and $207 as of December 31, 2018 and 2017 , respectively. The Company has an interest rate swap contract that effectively converts $20,000 of the variable-rate junior subordinated debentures to a fixed rate. See Note 10 for additional information on the interest rate swap. In addition, the junior subordinated debentures qualify as Tier 1 capital of the Company for regulatory purposes.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances (Notes)	12 Months Ended
	Dec. 31, 2018
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances, Disclosure [Text Block]	Federal Home Loan Bank and Other Borrowings The following table presents the terms of all FHLB advances as of December 31, 2018 and 2017 . December 31, 2018 December 31, 2017 Maturity Interest Effective Interest Effective Date Variable/Fixed Rate Rate (1) Balance Rate Rate (1) Balance 1/18/2019 Fixed 2.66% 2.66% $ 30,000 — — $ — 1/25/2019 Fixed 2.64% 2.64% 30,000 — — — 12/23/2019 Variable 3.08% 5.03% 25,000 1.93 % 3.90 % 25,000 6/22/2020 Variable 3.10% 5.20% 25,000 1.95 % 4.09 % 25,000 9/21/2020 Variable 3.10% 4.44% 30,000 1.95 % 4.44 % 30,000 140,000 80,000 Discount for modification (2,122 ) (3,618 ) Total FHLB advances, net of discount $ 137,878 $ 76,382 (1) The effective interest rate for the variable-rate advances includes the effects of the discount fee amortization and interest rate swaps, if applicable. FHLB advances totaling $80,000 were modified on December 21, 2012, to extend their terms and to convert the borrowings to a variable rate that is tied to 3-month LIBOR. In connection with these modifications, the Company paid a prepayment fee of $11,152 , which is being amortized and recognized as interest expense over the remaining terms of the advances. For the years ended December 31, 2018 , 2017 and 2016 , the Company amortized $1,496 , $1,496 and $1,501 , respectively, of interest expense related to the discount. Interest is payable quarterly on the FHLB advances. The Company also has an interest rate swap contract that effectively converts the $30,000 variable-rate advance to a fixed rate. See Note 10 for additional information on the interest rate swap. The FHLB advances are collateralized by FHLB stock and real estate loans, as required by the FHLB’s collateral policy. West Bank had additional borrowing capacity of approximately $289,000 at the FHLB as of December 31, 2018 . As of December 31, 2018 , West Bank had arrangements that would allow it to borrow $67,000 in unsecured federal funds lines of credit at correspondent banks that are available under the correspondent banks’ normal terms. The lines have no stated expiration dates. As of December 31, 2018 , there were no amounts outstanding under these arrangements.

Long-term debt (Notes)

Long-term debt (Notes)	12 Months Ended
	Dec. 31, 2018
Debt Instruments [Abstract]
Long-term Debt [Text Block]	Long-Term Debt In May 2017, the Company entered into a credit agreement with a commercial bank and borrowed $25,000 . This credit agreement replaced a prior credit agreement with the same commercial bank that had a remaining outstanding principal balance of $3,000. The additional borrowing was used to make a capital injection into West Bank in May 2017. Principal and interest under the term note are payable quarterly over five years . Required quarterly principal payments are $625 , with the balance due at maturity. The Company may make additional principal payments without penalty. The interest rate is variable at 1.95 percent plus 30-day LIBOR , which totaled 4.33 percent as of December 31, 2018 . In the event of default, the unaffiliated commercial bank may accelerate payment of the loan. The outstanding balance was $15,250 and $22,500 as of December 31, 2018 and 2017 , respectively. The note is secured by 100 percent of West Bank’s stock. In June 2013, a portion of the property purchased for the branch office in Coralville, Iowa, was financed with a $765 , nine year variable-payment contract with a fixed interest rate of 1.25 percent . The outstanding balance on the contract was $304 and $417 as of December 31, 2018 and 2017 , respectively. In December 2018, West Bank’s special purpose subsidiary entered into a credit agreement for $11,486 . Interest is payable monthly over the term of the agreement with an interest rate of 1.00 percent . Monthly principal payments begin in January 2026 and the agreement matures in December 2048. The outstanding balance was $11,486 as of December 31, 2018. Future required principal payments for long-term debt as of December 31, 2018 are shown in the table below. 2019 $ 2,615 2020 2,616 2021 2,537 2022 7,786 2023 — Thereafter 11,486 $ 27,040

Derivatives (Notes)

Derivatives (Notes)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivatives The Company uses interest rate swap agreements to manage the interest rate risk related to the variability of interest payments. The Company has variable-rate borrowings and deposits, which create exposure to variability in interest payments due to changes in interest rates. The notional amounts of the interest rate swaps do not represent amounts exchanged by the counterparties, but rather, the notional amount is used to determine, along with other terms of the derivative, the amounts to be exchanged between the counterparties. The Company has two interest rate swaps that effectively convert variable-rate FHLB advances and junior subordinated notes to fixed-rate debt. The swap transactions were designated as cash flow hedges of the changes in cash flows attributable to changes in LIBOR, the benchmark interest rate being hedged, associated with the interest payments made on the underlying debt with quarterly interest rate reset dates. One of these swaps had a forward starting date of September 30, 2018. In January 2018, the Company entered into an interest rate swap agreement that effectively converts certain customer deposits with variable rates based on the federal funds upper target rate to fixed-rate instruments. This swap transaction has a notional amount of $60,000 with a forward starting date of December 31, 2018 and is designated as a cash flow hedge of the risk of changes in total cash flows paid on certain customer deposits. Additionally, in January 2019, the Company entered into two new interest rate swap agreements that effectively convert certain borrowings to fixed rate instruments. These swap transactions have a notional amount of $25,000 each with fixed rates of 2.57 percent and 2.62 percent and mature in February 2024 and January 2026. Interest rate swaps, with a total notional amount of $70,000 , were terminated in prior years, subject to termination fees totaling $541 . The termination fees are being reclassified from accumulated other comprehensive income to interest expense over the remaining life of the underlying cash flows through June 2020. At the inception of each hedge transaction, the Company represented that the underlying principal balance would remain outstanding throughout the hedge transaction, making it probable that sufficient LIBOR-based or fed funds-based interest payments would exist through the maturity date of the swaps. The cash flow hedges were determined to be fully effective during the remaining terms of the swaps. Therefore, the aggregate fair value of the swaps is recorded in other assets or other liabilities with changes in market value recorded in OCI, net of deferred taxes. See Note 17 for additional fair value information and disclosures. The amounts included in AOCI will be reclassified to interest expense should the hedge no longer be considered effective. The Company estimates there will be approximately $404 reclassified from AOCI to interest expense through December 31, 2019 . The Company will continue to assess the effectiveness of the hedges on a quarterly basis. The Company is exposed to credit risk in the event of nonperformance by the interest rate swaps counterparty. The Company minimizes this risk by entering into derivative contracts with only large, stable financial institutions, and the Company has not experienced, and does not expect, any losses from counterparty nonperformance on the interest rate swaps. The Company monitors counterparty risk in accordance with the provisions of FASB ASC 815. In addition, the interest rate swap agreements contain language outlining collateral-pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain threshold limits. Derivative contracts are executed with a Credit Support Annex, which is a bilateral ratings-sensitive agreement that requires collateral postings at established credit threshold levels. These agreements protect the interests of the Company and its counterparties should either party suffer a credit rating deterioration. The Company was required to pledge $0 and $210 of cash as collateral to the counterparty as of December 31, 2018 and 2017 , respectively. The Company’s counterparty was required to pledge $2,410 and $980 at December 31, 2018 and 2017 , respectively. The table below identifies the balance sheet category and fair values of the Company’s derivative instruments designated as cash flow hedges as of December 31, 2018 and 2017 . Notional Amount Fair Value Balance Sheet Category Weighted Average Receive Rate Weighted Average Pay Rate Maturity December 31, 2018 Interest rate swap $ 30,000 $ 221 Other Assets 3.10 % 2.52 % 9/21/2020 Interest rate swap (1) 20,000 1,199 Other Assets 5.85 % 4.81 % 9/30/2026 Interest rate swap (2) 60,000 443 Other Assets 2.50 % 2.31 % 12/31/2025 December 31, 2017 Interest rate swap $ 30,000 $ (86 ) Other Liabilities 1.95 % 2.52 % 9/21/2020 Interest rate swap (1) 20,000 895 Other Assets — % 4.81 % 9/30/2026 (1) This swap is a forward-starting swap with a weighted average pay rate of 4.81 percent beginning September 30, 2018. No interest payments were required related to this swap until December 30, 2018. (2) This swap is a forward-starting swap with a weighted average pay rate of 2.31 percent beginning December 31, 2018. No interest payments are required related to this swap until January 31, 2019. The following table identifies the pretax gains or losses recognized on the Company’s derivative instruments designated as cash flow hedges for the years ended December 31, 2018 , 2017 and 2016 . Amount of Pretax Reclassified from AOCI into Income Gain (Loss) Years Ended: Recognized in OCI Category Amount of Loss December 31, 2018 $ 1,044 Interest Expense $ (105 ) December 31, 2017 $ (66 ) Interest Expense $ (413 ) December 31, 2016 $ 882 Interest Expense $ (573 )

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company files income tax returns in the U.S. federal and various state jurisdictions. Income tax returns for the years 2015 through 2018 remain open to examination by federal and state taxing authorities. No material income tax related interest or penalties were recognized during the years ended December 31, 2018 , 2017 or 2016 . The following table shows the components of income taxes for the years ended December 31, 2018 , 2017 and 2016 . 2018 2017 2016 Current: Federal $ 5,012 $ 8,822 $ 8,220 State 1,907 1,713 1,627 Deferred: Federal (277 ) 2,527 115 State (82 ) 306 (26 ) Income taxes $ 6,560 $ 13,368 $ 9,936 Total income taxes for the year ended December 31, 2018 differed from the amount computed by applying the U.S. federal income tax rate of 21 percent to income before income taxes, and for the years ended December 31, 2017 and 2016 , total income taxes differed by the amount computed by applying the U.S. federal income tax rate of 35 percent to income before income taxes as shown in the following table. 2018 2017 2016 Amount Percent of Pretax Income Amount Percent of Pretax Income Amount Percent of Pretax Income Computed expected tax expense $ 7,364 21.0 % $ 12,753 35.0 % $ 11,533 35.0 % State income tax expense, net of federal income tax benefit 1,425 4.1 % 1,146 3.2 % 1,004 3.0 % Tax-exempt interest income (1,390 ) (4.0 )% (2,023 ) (5.6 )% (1,823 ) (5.5 )% Nondeductible interest expense to own tax-exempt securities 231 0.7 % 152 0.4 % 58 0.2 % Tax-exempt increase in cash value of life insurance and gains (132 ) (0.4 )% (336 ) (0.9 )% (381 ) (1.2 )% Stock compensation (219 ) (0.6 )% (261 ) (0.7 )% — — Effect of change in federal income tax rate — — 2,340 6.4 % — — Amended tax returns 222 0.6 % — — — — Federal income tax credits (1,140 ) (3.3 )% (410 ) (1.1 )% (405 ) (1.2 )% Other, net 199 0.6 % 7 — (50 ) (0.1 )% Income taxes $ 6,560 18.7 % $ 13,368 36.7 % $ 9,936 30.2 % On December 22, 2017, the Tax Act was signed into law. The Tax Act reduced the federal corporate income tax rate from the previous maximum rate of 35 percent to 21 percent effective for 2018 and future years. The enactment of the legislation and the reduction in the federal income tax rate required a one-time reduction in net deferred tax assets and an increase in tax expense of $2,340 as shown in the table above for the year ended December 31, 2017 . Net deferred tax assets consisted of the following components as of December 31, 2018 and 2017 . 2018 2017 Deferred tax assets: Allowance for loan losses $ 4,172 $ 4,108 Net unrealized losses on securities available for sale 2,708 902 Intangibles — 101 Accrued expenses 346 176 Restricted stock unit compensation 704 544 State net operating loss carryforward 1,021 1,379 Other 67 86 9,018 7,296 Deferred tax liabilities: Deferred loan costs 183 193 Net unrealized gains on interest rate swaps 429 139 Premises and equipment 694 792 Other 173 148 1,479 1,272 Net deferred tax assets before valuation allowance 7,539 6,024 Valuation allowance for deferred tax assets (1,021 ) (1,379 ) Net deferred tax assets $ 6,518 $ 4,645 As of December 31, 2018 , the parent Company had approximately $25,526 of Iowa net operating loss carryforwards available to offset future Iowa taxable income. The Company has recorded a valuation allowance against the tax effect of the Iowa net operating loss carryforwards, as management believes it is more likely than not that such carryforwards will expire without being utilized. The Iowa net operating loss carryforwards expire in 2020 and thereafter.

Stock Compensation Plans (Notes

Stock Compensation Plans (Notes)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Stock Compensation Plans The West Bancorporation, Inc. 2017 Equity Incentive Plan (the 2017 Plan) was approved by the stockholders in April 2017. The 2017 Plan replaced the West Bancorporation, Inc. 2012 Equity Incentive Plan (the 2012 Plan). Upon approval of the 2017 Plan, the 2012 Plan was frozen and no new grants will be made under that plan. Outstanding awards under the 2012 Plan will continue pursuant to their terms and provisions. The Plans are administered by the Compensation Committee of the Board of Directors, which determines the specific individuals who will be granted awards under the 2017 Plan and the type and amount of any such awards. All employees and directors of, and service providers to, the Company and its subsidiary are eligible to become participants in the 2017 Plan, except that nonemployees may not be granted incentive stock options. Under the terms of the 2017 Plan, the Company may grant a total of 800,000 shares of the Company’s common stock as nonqualified and incentive stock options, stock appreciation rights and stock awards. As of December 31, 2018 , 639,500 shares of the Company’s common stock remained available for future awards under the 2017 Plan. Under the 2017 Plan, the Company may grant RSU awards, as determined by the Compensation Committee, that vest upon the completion of future service requirements or specified performance criteria. All RSUs granted through December 31, 2018 under the 2017 and 2012 Plans were at no cost to the participants, and the participants will not be entitled to receive or accrue dividends until the RSUs have vested. Each RSU entitles the participant to receive one share of common stock on the vesting date or upon the participant’s termination due to death or disability, or upon a change in control of the Company if the RSUs are not fully assumed or if the RSUs are assumed and the participant’s employment is thereafter terminated by the Company without cause or by the participant for good reason. If a participant terminates employment prior to the end of the continuous service period other than due to death, disability or retirement, the award is forfeited. If a participant terminates service due to retirement, the RSUs will continue to vest, subject to provisions of the 2017 and 2012 Plans. The following table includes a summary of nonvested RSU activity for the years ended December 31, 2018 , 2017 and 2016 . 2018 2017 2016 Weighted Weighted Weighted Average Average Average Grant Date Grant Date Grant Date Fair Value Fair Value Fair Value (actual amounts, not in thousands) Shares Per Share Shares Per Share Shares Per Share Nonvested shares, beginning balance 339,300 $ 19.55 307,268 $ 17.46 261,833 $ 16.67 Granted 136,500 25.81 138,500 22.06 141,000 18.44 Vested (121,450 ) 19.05 (106,468 ) 16.79 (95,565 ) 16.74 Forfeited — — — — — — Nonvested shares, ending balance 354,350 $ 22.13 339,300 $ 19.55 307,268 $ 17.46 The fair value of RSU awards that vested during 2018 , 2017 and 2016 was $3,144 , $2,371 and $1,730 , respectively. Total compensation costs, including director compensation, recorded for the RSUs were $2,741 , $2,632 , and $1,684 for the years ended December 31, 2018 , 2017 and 2016 , respectively. The tax benefit related to vesting of RSUs totaled $261 , $285 and $105 , respectively, for the years ended December 31, 2018 , 2017 and 2016 . As of December 31, 2018 , there was $4,235 of unrecognized compensation cost related to nonvested RSUs, and the weighted average period over which these remaining costs are expected to be recognized was approximately 1.5 years.

Employee Savings and Stock Owne

Employee Savings and Stock Ownership Plan (Notes)	12 Months Ended
	Dec. 31, 2018
Employee Savings and Stock Ownership Plan [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Employee Savings and Stock Ownership Plan The Company has an employee savings and stock ownership plan covering substantially all of its employees. The plan consists of two components. One component is an employee stock ownership plan. The other component is a discretionary contribution plan. Both components have a qualified cash or deferred arrangement under Internal Revenue Code Section 401(k). Matching and discretionary contributions are determined annually by the Board of Directors. The Company matched 100 percent of the first six percent of employee deferrals and made an annual discretionary contribution of four percent of eligible employee compensation for the years ended December 31, 2018 , 2017 and 2016 . Total matching and discretionary contribution expense for the years ended December 31, 2018 , 2017 and 2016 , totaled $1,040 , $961 and $1,023 , respectively. As of December 31, 2018 and 2017 , the plan held 306,678 and 294,423 shares, respectively, of the Company’s common stock. These shares are included in the computation of earnings per share. Dividends on shares held in the plan may be reinvested in Company common stock or paid in cash to the participants, at the election of the participants.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Notes)	12 Months Ended
	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss) Note [Text Block]	Comprehensive Income (Loss) The following table summarizes the changes in the balances of each component of AOCI, net of tax, for the years ended December 31, 2018 , 2017 and 2016 . Unrealized Accumulated Unrealized Gains Other Gains (Losses) (Losses) on Comprehensive on Securities Derivatives Income (Loss) Balance, December 31, 2015 $ 342 $ (772 ) $ (430 ) Other comprehensive income (loss) before reclassifications (1,394 ) 547 (847 ) Amounts reclassified from accumulated other comprehensive income (120 ) 355 235 Net current period other comprehensive income (loss) (1,514 ) 902 (612 ) Balance, December 31, 2016 (1,172 ) 130 (1,042 ) Other comprehensive (loss) before reclassifications (697 ) (41 ) (738 ) Amounts reclassified from accumulated other comprehensive income (368 ) 256 (112 ) Net current period other comprehensive income (loss) (1,065 ) 215 (850 ) Balance, December 31, 2017 (2,237 ) 345 (1,892 ) Transfer of securities held to maturity to securities available for sale 273 — 273 Other comprehensive income (loss) before reclassifications (5,856 ) 784 (5,072 ) Amounts reclassified from accumulated other comprehensive income 172 75 247 Net current period other comprehensive income (loss) (5,411 ) 859 (4,552 ) Reclassification of stranded tax effects (475 ) 105 (370 ) Balance, December 31, 2018 $ (8,123 ) $ 1,309 $ (6,814 )

Regulatory Capital Requirements

Regulatory Capital Requirements (Notes)	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements under Banking Regulations [Text Block]	Regulatory Capital Requirements The Company and West Bank are subject to various regulatory capital requirements administered by federal and state banking agencies. Failure to meet minimum capital requirements (as shown in the following table) can result in certain mandatory and possibly additional discretionary actions by regulators which, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and West Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items as calculated under regulatory requirements. The Company’s and West Bank’s capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Management believes the Company and West Bank met all capital adequacy requirements to which they were subject as of December 31, 2018 . The Company’s and West Bank’s capital amounts and ratios are presented in the following table as of December 31, 2018 and 2017 . Actual For Capital Adequacy Purposes For Capital Adequacy Purposes With Capital Conservation Buffer To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio As of December 31, 2018: Total Capital (to Risk-Weighted Assets) Consolidated $ 234,526 11.50 % $ 163,213 8.00 % $ 201,466 9.875 % N/A N/A West Bank 245,962 12.07 % 163,076 8.00 % 201,297 9.875 % $ 203,845 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 217,837 10.68 % 122,410 6.00 % 160,663 7.875 % N/A N/A West Bank 229,273 11.25 % 122,307 6.00 % 160,528 7.875 % 163,076 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 197,837 9.70 % 91,807 4.50 % 130,060 6.375 % N/A N/A West Bank 229,273 11.25 % 91,730 4.50 % 129,951 6.375 % 132,499 6.50 % Tier 1 Capital (to Average Assets) Consolidated 217,837 9.74 % 89,485 4.00 % 89,485 4.00 % N/A N/A West Bank 229,273 10.26 % 89,410 4.00 % 89,410 4.00 % 111,762 5.00 % As of December 31, 2017: Total Capital (to Risk-Weighted Assets) Consolidated $ 216,420 11.76 % $ 147,169 8.00 % $ 170,164 9.250 % N/A N/A West Bank 235,570 12.82 % 147,049 8.00 % 170,026 9.250 % $ 183,812 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 199,990 10.87 % 110,377 6.00 % 133,372 7.250 % N/A N/A West Bank 219,140 11.92 % 110,287 6.00 % 133,263 7.250 % 147,049 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 179,990 9.78 % 82,783 4.50 % 105,778 5.750 % N/A N/A West Bank 219,140 11.92 % 82,715 4.50 % 105,692 5.750 % 119,478 6.50 % Tier 1 Capital (to Average Assets) Consolidated 199,990 9.60 % 83,326 4.00 % 83,326 4.00 % N/A N/A West Bank 219,140 10.52 % 83,287 4.00 % 83,287 4.00 % 104,109 5.00 % On January 1, 2015, the Company and West Bank became subject to the rules of the Basel III Rule and related Dodd-Frank Wall Street Reform and Consumer Protection Act changes. The rules included the implementation of a capital conservation buffer that is added to the minimum requirements for capital adequacy purposes. The capital conservation buffer is subject to a three year phase-in period that began January 1, 2016 and will be fully phased-in on January 1, 2019 at 2.5 percent. The required phase-in capital conservation buffer was 1.875 percent during 2018 and 1.25 percent during 2017 . A banking organization with a conservation buffer of less than the required phase-in amount will be subject to limitations on capital distributions, including dividend payments and certain discretionary bonus payments to executive officers. As of December 31, 2018 , the ratios for the Company and West Bank were sufficient to meet the fully phased-in conservation buffer. The ability of the Company to pay dividends to its stockholders is dependent upon dividends paid by its subsidiary, West Bank. There are currently no restrictions on such dividends, besides the general restrictions imposed on all Iowa state-chartered banks by applicable law. The Company’s tangible common equity ratio was 8.32 percent and 8.42 percent at December 31, 2018 and 2017 , respectively. The tangible common equity ratio is computed by dividing total equity less preferred stock and intangible assets by total assets less intangible assets. As of December 31, 2018 and 2017 , the Company had no intangible assets or preferred stock.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies The Company leases real estate under a number of noncancelable operating lease agreements. Rent expense related to these leases was $1,540 , $1,344 and $1,293 , for the years ended December 31, 2018 , 2017 and 2016 , respectively. Total estimated minimum rental commitments were as follows as of December 31, 2018 . 2019 $ 1,534 2020 1,534 2021 1,479 2022 1,448 2023 1,457 Thereafter 3,858 $ 11,310 The Company had commitments to invest in qualified affordable housing projects totaling $4,421 and $6,130 as of December 31, 2018 and 2017 , respectively. Required reserve balances : West Bank is required to maintain an average reserve balance with the Federal Reserve Bank, which is included in cash and due from banks. Required reserve balances were approximately $4,527 and $6,086 as of December 31, 2018 and 2017 , respectively. Financial instruments with off-balance sheet risk : The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations that it uses for on-balance sheet instruments. Commitments to lend are subject to borrowers’ continuing compliance with existing credit agreements. The Company’s commitments consisted of the following approximate amounts as of December 31, 2018 and 2017 . 2018 2017 Commitments to extend credit $ 641,581 $ 617,949 Standby letters of credit 6,631 5,996 $ 648,212 $ 623,945 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract and generally expire within one year. Commitments to extend credit of approximately $90,781 at December 31, 2018 , expire beyond one year. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained is based on management’s credit evaluation of the party. Collateral held varies, but may include accounts receivable, inventory, equipment, and residential and commercial real estate. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party and generally expire within one year. Those guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. Collateral held varies as specified above and is required in instances the Company deems necessary. In the event the customer does not perform in accordance with the terms of the third-party agreement, West Bank would be required to fund the commitment. The maximum potential amount of future payments West Bank could be required to make is represented by the contractual amount for letters of credit shown in the table above. If the commitment is funded, West Bank would be entitled to seek recovery from the customer. At December 31, 2018 and 2017 , no amounts have been recorded as liabilities for West Bank’s potential obligations under these guarantees. West Bank previously executed MPF Master Commitments (Commitments) with the FHLB of Des Moines to deliver residential mortgage loans and to guarantee the payment of any realized losses that exceed the FHLB’s first loss account for mortgages delivered under the Commitments. West Bank receives credit enhancement fees from the FHLB for providing this guarantee and continuing to assist with managing the credit risk of the MPF Program residential mortgage loans. The term of the most recent Commitment was through January 16, 2015 and was not renewed. The outstanding balance of mortgage loans sold under the MPF Program was $78,024 and $94,292 at December 31, 2018 and 2017 , respectively. Concentrations of credit risk : Substantially all of the Company’s loans, commitments to extend credit and standby letters of credit have been granted to customers in the Company’s market areas (a 50-mile radius of the greater Des Moines, Iowa, metropolitan area, a 30-mile radius of the Iowa City, Iowa, metropolitan area and a 30-mile radius of the Rochester, Minnesota, metropolitan area). The concentrations of credit by type of loan are set forth in Note 4. The distribution of commitments to extend credit approximates the distribution of loans outstanding. Standby letters of credit were granted primarily to commercial borrowers. Contingencies : Neither the Company nor West Bank is a party, and no property of these entities is subject, to any material pending legal proceedings, other than ordinary routine litigation incidental to West Bank’s business. The Company does not know of any proceeding contemplated by a governmental authority against the Company or West Bank.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value Measurements Accounting guidance on fair value measurements and disclosures defines fair value and establishes a framework for measuring the fair value of assets and liabilities using a hierarchy system. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants in the market in which the reporting entity transacts business. The Company’s balance sheet contains investment securities available for sale and derivative instruments that are recorded at fair value on a recurring basis. The three-level valuation hierarchy for disclosure of fair value is as follows: Level 1 uses quoted market prices in active markets for identical assets or liabilities. Level 2 uses observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3 uses unobservable inputs that are not corroborated by market data. The Company’s policy is to recognize transfers between Levels at the end of each reporting period, if applicable. There were no transfers between Levels of the fair value hierarchy during 2018 or 2017 . The following is a description of valuation methodologies used for financial assets and liabilities recorded at fair value on a recurring basis. Investment securities available for sale: When available, quoted market prices are used to determine the fair value of investment securities (Level 1). If quoted market prices are not available, the Company determines fair value based on various sources and may apply matrix pricing with observable prices for similar bonds where a price for the identical bond is not observable (Level 2). The fair values of these securities are determined by pricing models that consider observable market data such as interest rate volatilities, LIBOR yield curve, credit spreads, prices from market makers and live trading systems. For the corporate bond portfolio, the Company has elected to use a matrix pricing model as a practical expedient to individual quoted market prices. Generally, management obtains the fair value of investment securities at the end of each reporting period via a third-party pricing service. Management reviewed the valuation process used by the third party and believed that process was valid. On a quarterly basis, management corroborates the fair values of a randomly selected sample of investment securities by obtaining pricing from an independent investment portfolio management firm and compares the two sets of fair values. Any significant variances are reviewed and investigated. For a sample of securities, the fair values are further validated by management, with assistance from an independent investment portfolio management firm, by obtaining details of the inputs used by the pricing service. Those inputs were independently tested, and management concluded the fair values were consistent with GAAP requirements and the investment securities were properly classified in the fair value hierarchy. Derivative instruments: The Company’s derivative instruments consist of interest rate swaps, which are accounted for as cash flow hedges. The Company’s derivative positions are classified within Level 2 of the fair value hierarchy and are valued using models generally accepted in the financial services industry and that use actively quoted or observable market input values from external market data providers and/or nonbinding broker-dealer quotations. The fair value of the derivatives are determined using discounted cash flow models. These models’ key assumptions include the contractual terms of the respective contract along with significant observable inputs, including interest rates, yield curves, nonperformance risk and volatility. The following tables present the balances of financial assets and liabilities measured at fair value on a recurring basis by level as of December 31, 2018 and 2017 . 2018 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: State and political subdivisions $ 149,156 $ — $ 149,156 $ — Collateralized mortgage obligations 157,004 — 157,004 — Mortgage-backed securities 63,378 — 63,378 — Asset-backed securities 31,903 — 31,903 — Trust preferred security 1,900 — 1,900 — Corporate notes 50,417 — 50,417 — Derivative instrument, interest rate swaps 1,863 — 1,863 — 2017 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: State and political subdivisions $ 146,313 $ — $ 146,313 $ — Collateralized mortgage obligations 159,932 — 159,932 — Mortgage-backed securities 60,429 — 60,429 — Asset-backed securities 45,195 — 45,195 — Trust preferred security 2,006 — 2,006 — Corporate notes 30,344 — 30,344 — Derivative instrument, interest rate swap 895 — 895 — Financial liabilities: Derivative instrument, interest rate swap $ 86 $ — $ 86 $ — Certain assets are measured at fair value on a nonrecurring basis. That is, they are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). As of both December 31, 2018 and 2017 , impaired loans with a fair value adjustment had a net book value of $0 . Impaired loans are classified within Level 3 of the fair value hierarchy and are evaluated and valued at the lower of cost or fair value when the loan is identified as impaired. Fair value is measured based on the value of the collateral securing these loans. The types of collateral vary widely and could include accounts receivables, inventory, a variety of equipment and real estate. Evaluations of the underlying assets are completed for each impaired loan with a specific reserve. Collateral evaluations are reviewed and discounted as appropriate based on knowledge of the specific type of collateral. In the case of real estate, an independent appraisal may be obtained. Types of discounts considered included aging of receivables, condition of the collateral, potential market for the collateral and estimated disposal costs. These discounts will vary from loan to loan and may be discounted based on management’s opinions concerning market developments or the client’s business. GAAP requires disclosure of the fair value of financial assets and liabilities, including those that are not measured and reported at fair value on a recurring or nonrecurring basis. The following table presents the carrying amounts and approximate fair values of financial assets and liabilities as of December 31, 2018 and 2017 . 2018 2017 Fair Value Hierarchy Level Carrying Amount Approximate Fair Value Carrying Amount Approximate Fair Value Financial assets: Cash and due from banks Level 1 $ 46,369 $ 46,369 $ 34,952 $ 34,952 Federal funds sold Level 1 1,105 1,105 12,997 12,997 Investment securities available for sale Level 2 453,758 453,758 444,219 444,219 Investment securities held to maturity Level 2 — — 45,527 45,890 Federal Home Loan Bank stock Level 1 12,037 12,037 9,174 9,174 Loans, net Level 2 1,705,141 1,688,700 1,494,070 1,490,166 Accrued interest receivable Level 1 7,631 7,631 7,344 7,344 Interest rate swaps Level 2 1,863 1,863 895 895 Financial liabilities: Deposits Level 2 $ 1,894,529 $ 1,893,621 $ 1,810,813 $ 1,810,924 Federal funds purchased Level 1 19,985 19,985 545 545 Subordinated notes, net Level 2 20,425 15,498 20,412 15,357 Federal Home Loan Bank advances, net Level 2 137,878 137,878 76,382 76,382 Long-term debt, net Level 2 27,040 27,000 22,917 22,860 Accrued interest payable Level 1 1,317 1,317 736 736 Interest rate swap Level 2 — — 86 86 Off-balance-sheet financial instruments: Commitments to extend credit Level 3 — — — — Standby letters of credit Level 3 — — — —

West Bancorporation, Inc. (Pare

West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Notes)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements Balance Sheets December 31, 2018 and 2017 2018 2017 ASSETS Cash $ 3,951 $ 3,226 Investment in West Bank 221,559 216,693 Investment in West Bancorporation Capital Trust I 619 619 Other assets 1,232 1,034 Total assets $ 227,361 $ 221,572 LIABILITIES AND STOCKHOLDERS’ EQUITY LIABILITIES Accrued expenses and other liabilities $ 663 $ 562 Subordinated notes, net 20,425 20,412 Long-term debt 15,250 22,500 Total liabilities 36,338 43,474 STOCKHOLDERS’ EQUITY Preferred stock — — Common stock 3,000 3,000 Additional paid-in capital 25,128 23,463 Retained earnings 169,709 153,527 Accumulated other comprehensive loss (6,814 ) (1,892 ) Total stockholders’ equity 191,023 178,098 Total liabilities and stockholders’ equity $ 227,361 $ 221,572 Statements of Income Years Ended December 31, 2018, 2017 and 2016 2018 2017 2016 Operating income: Equity in net income of West Bank $ 30,282 $ 23,933 $ 23,544 Equity in net income of West Bancorporation Capital Trust I 33 27 23 Intercompany rental income — 333 503 Other rental income — 21 50 Total operating income 30,315 24,314 24,120 Operating expenses: Interest on subordinated notes 1,076 901 728 Interest on long-term debt 750 517 145 Occupancy — 187 280 Other expenses 530 602 443 Total operating expenses 2,356 2,207 1,596 Income before income taxes 27,959 22,107 22,524 Income tax benefits (549 ) (963 ) (492 ) Net income $ 28,508 $ 23,070 $ 23,016 Statements of Cash Flows Years Ended December 31, 2018, 2017 and 2016 2018 2017 2016 Cash Flows from Operating Activities: Net income $ 28,508 $ 23,070 $ 23,016 Adjustments to reconcile net income to net cash provided by operating activities: Equity in net income of West Bank (30,282 ) (23,933 ) (23,544 ) Equity in net income of West Bancorporation Capital Trust I (33 ) (27 ) (23 ) Dividends received from West Bank 22,300 16,800 14,400 Dividends received from West Bancorporation Capital Trust I 33 27 23 Amortization 13 17 20 Depreciation — 178 244 Deferred income tax (benefits) — (240 ) 97 Change in assets and liabilities: (Increase) decrease in other assets 107 50 (79 ) Increase (decrease) in accrued expenses and other liabilities 25 (549 ) 641 Net cash provided by operating activities 20,671 15,393 14,795 Cash Flows from Investing Activities: Proceeds from sales of premises — 18,032 — Purchases of premises — (16 ) (10,539 ) Capital contribution to West Bank — (40,000 ) — Net cash (used in) investing activities — (21,984 ) (10,539 ) Cash Flows from Financing Activities: Proceeds from long-term debt — 22,000 — Principal payments on long-term debt (7,250 ) (4,629 ) (3,286 ) Common stock cash dividends (12,696 ) (11,499 ) (10,800 ) Net cash provided by (used in) financing activities (19,946 ) 5,872 (14,086 ) Net increase (decrease) in cash 725 (719 ) (9,830 ) Cash: Beginning 3,226 3,945 13,775 Ending $ 3,951 $ 3,226 $ 3,945

Selected Quarterly Financial Da

Selected Quarterly Financial Data (unaudited) (Notes)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Information [Abstract]
Quarterly Financial Information [Text Block]	Selected Quarterly Financial Data (unaudited) 2018 Three months ended March 31 June 30 September 30 December 31 Interest income $ 19,730 $ 20,537 $ 21,920 $ 22,606 Interest expense 4,314 5,238 6,233 6,950 Net interest income 15,416 15,299 15,687 15,656 Provision for loan losses 150 — (400 ) — Net interest income after provision for loan losses 15,266 15,299 16,087 15,656 Noninterest income 1,913 2,023 2,114 1,702 Noninterest expense 8,287 8,958 8,561 9,186 Income before income taxes 8,892 8,364 9,640 8,172 Income taxes 1,508 1,600 2,507 945 Net income $ 7,384 $ 6,764 $ 7,133 $ 7,227 Basic earnings per common share $ 0.46 $ 0.42 $ 0.44 $ 0.44 Diluted earnings per common share $ 0.45 $ 0.41 $ 0.43 $ 0.44 2017 Three months ended March 31 June 30 September 30 December 31 Interest income $ 16,791 $ 18,166 $ 18,560 $ 19,517 Interest expense 2,402 3,073 3,529 3,973 Net interest income 14,389 15,093 15,031 15,544 Provision for loan losses — — — — Net interest income after provision for loan losses 14,389 15,093 15,031 15,544 Noninterest income 2,160 2,316 2,264 1,908 Noninterest expense 8,043 8,172 8,020 8,032 Income before income taxes 8,506 9,237 9,275 9,420 Income taxes 2,400 2,872 2,870 5,226 Net income $ 6,106 $ 6,365 $ 6,405 $ 4,194 Basic earnings per common share $ 0.38 $ 0.39 $ 0.40 $ 0.26 Diluted earnings per common share $ 0.37 $ 0.39 $ 0.39 $ 0.26

Organization and Nature of Bu_2

Organization and Nature of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates, Policy [Policy Text Block]	Accounting estimates and assumptions : The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) established by the Financial Accounting Standards Board (FASB). References to GAAP issued by the FASB in these footnotes are to the FASB Accounting Standards Codification TM , sometimes referred to as the Codification or ASC. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses for the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term are the fair value of financial instruments and the allowance for loan losses.
Consolidation, Policy [Policy Text Block]	Consolidation policy : The consolidated financial statements include the accounts of the Company, West Bank and West Bank’s special purpose subsidiaries (which facilitate an investment in new market tax credit activity in 2018) and WB Funding Corporation (which was liquidated in March 2018). All significant intercompany transactions and balances have been eliminated in consolidation. In addition, the Company owns an unconsolidated subsidiary, West Bancorporation Capital Trust I (the Trust), which was formed for the purpose of issuing trust preferred securities. In accordance with GAAP, the results of the Trust are recorded on the books of the Company using the equity method of accounting and are not consolidated.
Segment Reporting, Policy [Policy Text Block]	Segment information: An operating segment is generally defined as a component of a business for which discrete financial information is available and whose operating results are regularly reviewed by the chief operating decision-maker. As a community-oriented financial institution, substantially all of West Bank’s operations involve the delivery of loan and deposit products to customers. Management makes operating decisions and assesses performance based on an ongoing review of the community banking activities, which constitutes the Company’s only operating segment for financial reporting purposes.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive income : Comprehensive income consists of net income and other comprehensive income (OCI). OCI consists of the net change in unrealized gains and losses on the Company’s investment securities available for sale, including the noncredit-related portion of unrealized gains (losses) of other than temporarily impaired (OTTI) securities, if any, and the effective portion of the change in fair value of derivative instruments. OCI also includes the amortization of derivative termination costs and the amortization of unrealized gains on investment securities transferred from available for sale to held to maturity.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents and cash flows : For statement of cash flow purposes, the Company considers cash, due from banks and federal funds sold to be cash and cash equivalents. Cash inflows and outflows from loans, deposits and federal funds purchased are reported on a net basis.
Investment Securities, Policy [Policy Text Block]	Investment securities : Investment securities that management has the intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Investment securities that may be sold for general liquidity needs, in response to market interest rate fluctuations, implementation of asset-liability management strategies, funding loan demand, changes in securities prepayment risk or other similar factors are classified as available for sale and reported at fair value, with unrealized gains and losses reported as a separate component of accumulated other comprehensive income (AOCI), net of deferred income taxes. Realized gains and losses on sales of investment securities are computed on a specific identification basis based on amortized cost. The amortized cost of debt securities classified as held to maturity or available for sale is adjusted for accretion of discounts to maturity and amortization of premiums over the estimated average life of each security or, in the case of callable securities, through the first call date, using the effective yield method. Such amortization and accretion is included in interest income. Interest income on securities is recognized using the interest method according to the terms of the investment security. The Company evaluates each of its investment securities whose value has declined below amortized cost to determine whether the decline in fair value is OTTI. When determining whether an investment security is OTTI, management assesses the severity and duration of the decline in fair value, the length of time expected for recovery, the financial condition of the issuer and other qualitative factors, as well as whether: (a) it has the intent to sell the security, and (b) it is more likely than not that it will be required to sell the security prior to its anticipated recovery. In instances when a determination is made that an OTTI exists but management does not intend to sell the security and it is not more likely than not that it will be required to sell the security prior to its anticipated repayment or maturity, the OTTI is separated into: (a) the amount of the total OTTI related to a decrease in cash flows expected to be collected from the security (the credit loss); and (b) the amount of the total OTTI related to all other factors. The amount of the total OTTI related to the credit loss is recognized as a charge to earnings. The amount of the total OTTI related to all other factors is recognized in OCI. If the Company intends to sell or it is more likely than not that it will be required to sell a security with OTTI before recovery of its amortized cost basis, the OTTI is recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date.
Federal Home Loan Bank Stock [Policy Text Block]	Federal Home Loan Bank stock : West Bank, as a member of the Federal Home Loan Bank (FHLB) system, is required to maintain an investment in capital stock of the FHLB in an amount equal to 0.12 percent of total assets plus 4.00 percent of outstanding advances from the FHLB and the outstanding principal balance of loans previously issued through the Mortgage Partnership Finance Program (MPF). No ready market exists for the FHLB stock, and it has no quoted market value. The Company evaluates this asset for impairment on a quarterly basis and determined there was no impairment as of December 31, 2018 . All shares of FHLB stock are issued and redeemed at par value.
Loans and Leases Receivable, Origination Fees, Discounts or Premiums, and Direct Costs to Acquire Loans Policy [Policy Text Block]	Loans : Loans are stated at the principal amounts outstanding, net of unamortized loan fees and costs, with interest income recognized on the interest method based upon the terms of the loan. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield using the interest method.
Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy [Policy Text Block]	Delinquencies are determined based on the payment terms of the individual loan agreements. The accrual of interest on past due and other impaired loans is generally discontinued at 90 days past due or when, in the opinion of management, the borrower may be unable to make all payments pursuant to contractual terms. Unless considered collectible, all interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income, if accrued in the current year, or charged to the allowance for loan losses, if accrued in the prior year. Generally, all payments received while a loan is on nonaccrual status are applied to the principal balance of the loan. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block]	A loan is classified as troubled debt restructured (TDR) when the Company separately concludes that a borrower is experiencing financial difficulties and a concession is granted that would not otherwise be considered. Concessions may include a restructuring of the loan terms to alleviate the burden of the borrower’s cash requirements, such as an extension of the payment terms beyond the original maturity date or a change in the interest rate charged. TDR loans with extended payment terms are accounted for as impaired until performance is established. A change to the interest rate would change the classification of a loan to a TDR loan if the restructured loan yields a rate that is below a market rate for that of a new loan with comparable risk. TDR loans with below market rates are considered impaired until fully collected. TDR loans may also be reported as nonaccrual or 90 days past due if they are not performing per the restructured terms.
Impaired Financing Receivable, Policy [Policy Text Block]	Based upon its ongoing assessment of credit quality within the loan portfolio, the Company maintains a Watch List, which includes loans classified as Doubtful, Substandard and Watch according to the Company’s classification criteria. These loans involve the anticipated potential for payment defaults or collateral inadequacies. A loan on the Watch List is considered impaired when management believes it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with 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, as a practical expedient, at the loan’s observable market price or the fair value of the collateral if the loan is collateral dependent. The amount of impairment, if any, and any subsequent changes are included in the allowance for loan losses.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for loan losses : The allowance for loan losses is established through a provision for loan losses charged to expense. The allowance is an amount that management believes will be adequate to absorb probable losses on existing loans based on an evaluation of the collectability of loans and prior loss experience. This evaluation also takes into consideration such factors as changes in the nature and volume of the loan portfolio, overall portfolio quality, the review of specific problem loans, and current economic conditions that may affect the borrowers’ ability to pay. Loans are charged off against the allowance for loan losses when management believes that collectability of the principal is unlikely. While management uses the best information available to make its evaluations, future adjustments to the allowance may be necessary if there are significant changes in economic conditions or the other factors relied upon. The allowance for loan losses consists of specific and general components. The specific component relates to loans that meet the definition of impaired. The general component covers the remaining loans and is based on historical loss experience adjusted for qualitative factors such as delinquency trends, loan growth, economic elements and local market conditions. These same policies are applied to all segments of loans. In addition, regulatory agencies, as integral parts of their examination processes, periodically review the Company’s allowance for loan losses, and may require the Company to make additions to the allowance based on their judgment about information available to them at the time of their examinations.
Property, Plant and Equipment, Policy [Policy Text Block]	Premises and equipment : Premises and equipment are stated at cost less accumulated depreciation. The straight-line method of depreciation and amortization is used for calculating expense. The estimated useful lives of premises and equipment range up to 40 years for buildings, up to 10 years for furniture and equipment, and the shorter of the estimated useful life or lease term for leasehold improvements.
Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy [Policy Text Block]	Other real estate owned : Real estate properties acquired through or in lieu of foreclosure are initially recorded at fair value less estimated selling cost at the date of foreclosure, establishing a new cost basis. Fair value is determined by management by obtaining appraisals or other market value information at the time of foreclosure. Any write-downs in value at the date of acquisition are charged to the allowance for loan losses. After foreclosure, valuations are periodically performed by management by obtaining updated appraisals or other market value information at least annually. Any subsequent write-downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the updated fair value less estimated selling cost. Net costs related to the holding of properties are included in noninterest expense.
Trust Assets Policy [Policy Text Block]	Trust assets : Assets held by West Bank in fiduciary or agency capacities, other than trust cash on deposit at West Bank, are not included in the consolidated balance sheets of the Company, as such assets are not assets of West Bank.
Bank-Owned Life Insurance [Policy Text Block]	Bank-owned life insurance : The carrying amount of bank-owned life insurance consists of the initial premium paid, plus increases in cash value, less the carrying amount associated with any death benefit received. Death benefits paid in excess of the applicable carrying amount are recognized as income. Increases in cash value and the portion of death benefits recognized as income are exempt from income taxes.
Derivatives, Policy [Policy Text Block]	Derivatives: The Company uses derivative financial instruments (which consist of interest rate swaps) to assist in its interest rate risk management. All derivatives are measured and reported at fair value on the Company’s consolidated balance sheet as other assets or other liabilities. The Company records cash flow hedges at the inception of the derivative contract based on the Company’s intentions and belief as to likely effectiveness as a hedge. The Company documents the strategy for entering into the transactions and the method of assessing ongoing effectiveness. Cash flow hedges represent a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability. For a cash flow hedge that is effective, 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. The changes in the fair value of derivatives that are not highly effective in hedging the changes in expected cash flows of the hedged item are recognized immediately in current earnings. All of the Company’s cash flow hedges qualify for hedge accounting and are considered highly effective. Net cash settlements on derivatives that qualify for hedge accounting are recorded in interest income or interest expense, based on the item being hedged. Cash flows on hedges are classified in the cash flow statement the same as the cash flows of the items being hedged. To determine fair value, the Company uses third party pricing models that incorporate assumptions about market conditions and risks that are current at the reporting date. The Company does not use derivative instruments for trading or speculative purposes. The Company formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in 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 noninterest income. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods in which the hedged transactions will affect earnings.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-based compensation: The Company’s current and previous equity incentive plans were approved by the stockholders as a means to attract, retain and reward selected participants. The plans are administered by the Compensation Committee of the Board of Directors. Compensation expense for stock-based awards is recognized on a straight-line basis over the vesting period, or until the participant reaches full retirement age if less than the vesting period, using the fair value of the award at the time of the grant. The restricted stock unit (RSU) participants do not have dividend rights prior to vesting, so the fair value of nonvested RSUs is equal to the fair market value of the underlying common stock at the grant date, reduced by the present value of the dividends expected to be paid on the underlying shares during the vesting period. Prior to January 1, 2017, the Company assumed no projected forfeitures on its stock-based compensation, since all RSUs were expected to vest and no forfeitures had occurred as of December 31, 2016. Upon adoption of ASU No. 2016-09, Compensation - Stock Compensation (Topic 718) on January 1, 2017, the Company made the accounting policy election to account for forfeitures as they occur.
Deferred compensation [Policy Text Block]	Deferred compensation: The West Bancorporation, Inc. Deferred Compensation Plan (the Deferred Compensation Plan) provides certain individuals with additional deferral opportunities in planning for retirement. Eligible participants, including directors and key officers of the Company, may choose to voluntarily defer receipt of a portion of their respective cash compensation. The Deferred Compensation Plan is an unfunded, nonqualified deferred compensation plan intended to conform to the requirements of Section 409A of the Internal Revenue Code.
Transfers and Servicing of Financial Assets, Policy [Policy Text Block]	Transfer of financial assets : Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right, free of conditions that constrain it from taking advantage of that right, to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Income Tax, Policy [Policy Text Block]	Income taxes : The Company files a consolidated federal income tax return. Income tax expense is generally allocated as if the Company and its subsidiary file separate income tax returns. Deferred taxes are provided on an asset and liability method whereby deferred tax assets are recognized for deductible temporary differences, capital losses and net operating losses, and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax basis. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. When tax returns are filed, it is highly certain that some tax positions taken will be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the positions taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the consolidated financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. The evaluation of a tax position taken is considered by itself and is not offset or aggregated with other positions. Tax positions that meet the more likely than not recognition threshold are measured as the largest amount of tax benefit that is more than 50 percent likely of being realized upon settlement with the applicable taxing authority. Management does not believe the Company has any material uncertain tax positions to disclose. Interest and penalties, if any, related to income taxes are recorded as other noninterest expense in the consolidated income statements in the year assessed.
Earnings Per Share, Policy [Policy Text Block]	Earnings per common share : Basic earnings per common share are computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted earnings per common share reflect the potential dilution that could occur if the Company’s outstanding RSUs were vested. The dilutive effect is computed using the treasury stock method, which assumes all stock-based awards were exercised and the hypothetical proceeds from exercise were used by the Company to purchase common stock at the average market price during the period.
New Accounting Pronouncements, Policy [Policy Text Block]	Current accounting developments : In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the Codification. The core principle is that a company should recognize revenue to depict the transfer of promised goods and services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. For public companies, this update was effective for interim and annual periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method. The implementation of the new standard did not result in a change to the accounting for any in-scope revenue streams; as such, no cumulative effect adjustment to opening retained earnings was recorded. The Company's revenue is primarily composed of interest income on financial instruments, including investment securities and loans, which are excluded from the scope of Topic 606. Also excluded from the scope of the update is revenue from bank-owned life insurance, loan fees and letter of credit fees. Approximately 90 percent of the Company’s revenue is outside the scope of this update. Topic 606 is applicable to deposit account related fees, including general service fees charged for deposit account maintenance and activity and transaction-based fees charged for certain services, such as debit card, wire transfer or overdraft activities. Revenue is recognized when the performance obligation is completed, which is generally after a transaction is completed or monthly for account maintenance services. Topic 606 is also applicable to trust services, which include periodic fees earned from trusts and investment management agency accounts, estate administration, custody accounts, individual retirement accounts, and other related services. Fees are charged based on standard agreements or by statute and are recognized over the period of time the Company provides the contracted services. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The update enhances the reporting model for financial instruments to provide users of financial statements with more decision-useful information by updating certain aspects of recognition, measurement, presentation and disclosure of financial instruments. Among other changes, the update requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, and clarifies that entities should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entities' other deferred tax assets. For public companies, this update was effective for interim and annual periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method. Upon adoption, the fair value of the Company’s loan portfolio is now presented using an exit price method. Also, the Company is no longer required to disclose the methodologies used for estimating fair value of financial assets and liabilities that are not measured at fair value on a recurring or nonrecurring basis. The remaining requirements of this update did not have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The guidance in the update supersedes the requirements in ASC Topic 840, Leases. The guidance is intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for leases with terms of more than 12 months. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2018. In July 2018, the FASB issued ASU No. 2018-11, Targeted Improvements, which amends ASC 842, Leases to provide for an adoption option that will not require earlier periods to be restated at the adoption date. The Company currently leases its main location and space for six other branch offices and operational departments under operating leases that will result in recognition of lease assets and lease liabilities on the consolidated balance sheets under the updates. The Company adopted this guidance effective January 1, 2019 and recorded a right-of-use asset of $9,604 and lease liability of $9,841 . In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326). The amendments in this update require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected on the financial assets. Under the updates, the income statement will reflect the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount of financial assets. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination that are measured at amortized cost basis is determined in a similar manner to other financial assets measured at amortized cost basis; however, the initial allowance for credit losses is added to the purchase price rather than being reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for these assets. Off-balance-sheet arrangements such as commitments to extend credit, guarantees, and standby letters of credit that are not considered derivatives under ASC 815 and are not unconditionally cancellable are also within the scope of this update. Credit losses relating to available for sale debt securities should be recorded through an allowance for credit losses. For public companies, the update is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. All entities may adopt the amendments in this update earlier as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply the amendments in this update on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company does not plan to early adopt this standard, but is working through implementation. The Company continues collecting and retaining historical loan and credit data and is currently evaluating various loss estimation models. While we currently cannot reasonably estimate the impact of adopting this standard, we expect the impact will be influenced by the composition, characteristics and quality of our loan and securities portfolios, as well as the general economic conditions and forecasts as of the adoption date. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . The amendments in this update make targeted changes to the existing hedge accounting model to better align the accounting rules with a company’s risk management activities, and to simplify the application of the hedge accounting model. The update expands the types of transactions eligible for hedge accounting, eliminates the requirement to separately measure and present hedge ineffectiveness, and simplifies the way assessments of hedge ineffectiveness may be performed. The update also permits a one-time reclassification of prepayable debt securities from held to maturity classification to available for sale. For public companies, the update is effective for annual periods beginning after December 15, 2018, with early adoption permitted, including in an interim period. The amendments’ presentation and disclosure guidance is required on a prospective basis. The Company adopted the guidance effective January 1, 2018. The requirements of this update related to the Company’s hedging activities did not have any impact on the Company’s consolidated financial statements. Upon adoption, the Company elected to transfer all its held to maturity securities portfolio to available for sale. The transferred securities had an amortized cost basis of $45,527 and a fair value of $45,890 . Upon transfer, the Company recorded an adjustment of $273 to accumulated other comprehensive income (loss), net of deferred income taxes, for the unrealized gains and losses related to the transferred securities. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendment in this update allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 22, 2017, enactment of Public Law 115-97, commonly known as the Tax Cut and Jobs Act (Tax Act), which reduced the federal corporate income tax rate and became effective in 2018. For public companies, the update is effective for annual periods beginning after December 15, 2018, with early adoption permitted. The amendment can be adopted at the beginning of the period or on a retrospective basis. The Company adopted the amendment effective January 1, 2018, using the beginning of period method. The reclassified amount was $370 . In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . The amendments in this update modify the disclosure requirements for fair value measurements by removing, modifying, or adding certain disclosures. The update is effective for interim and annual periods in fiscal years beginning after December 15, 2019, with early adoption permitted for the removed disclosures and delayed adoption until the fiscal year 2020 permitted for the new disclosures. The removed and modified disclosures will be adopted on a retrospective basis, and the new disclosures will be adopted on a prospective basis. The adoption will not have a material effect on the Company’s consolidated financial statements.
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	Financial instruments with off-balance sheet risk : The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations that it uses for on-balance sheet instruments. Commitments to lend are subject to borrowers’ continuing compliance with existing credit agreements.
Fair Value Measurement, Policy [Policy Text Block]	Accounting guidance on fair value measurements and disclosures defines fair value and establishes a framework for measuring the fair value of assets and liabilities using a hierarchy system. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants in the market in which the reporting entity transacts business. The Company’s balance sheet contains investment securities available for sale and derivative instruments that are recorded at fair value on a recurring basis. The three-level valuation hierarchy for disclosure of fair value is as follows: Level 1 uses quoted market prices in active markets for identical assets or liabilities. Level 2 uses observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3 uses unobservable inputs that are not corroborated by market data. The Company’s policy is to recognize transfers between Levels at the end of each reporting period, if applicable. There were no transfers between Levels of the fair value hierarchy during 2018 or 2017 . The following is a description of valuation methodologies used for financial assets and liabilities recorded at fair value on a recurring basis. Investment securities available for sale: When available, quoted market prices are used to determine the fair value of investment securities (Level 1). If quoted market prices are not available, the Company determines fair value based on various sources and may apply matrix pricing with observable prices for similar bonds where a price for the identical bond is not observable (Level 2). The fair values of these securities are determined by pricing models that consider observable market data such as interest rate volatilities, LIBOR yield curve, credit spreads, prices from market makers and live trading systems. For the corporate bond portfolio, the Company has elected to use a matrix pricing model as a practical expedient to individual quoted market prices. Generally, management obtains the fair value of investment securities at the end of each reporting period via a third-party pricing service. Management reviewed the valuation process used by the third party and believed that process was valid. On a quarterly basis, management corroborates the fair values of a randomly selected sample of investment securities by obtaining pricing from an independent investment portfolio management firm and compares the two sets of fair values. Any significant variances are reviewed and investigated. For a sample of securities, the fair values are further validated by management, with assistance from an independent investment portfolio management firm, by obtaining details of the inputs used by the pricing service. Those inputs were independently tested, and management concluded the fair values were consistent with GAAP requirements and the investment securities were properly classified in the fair value hierarchy. Derivative instruments: The Company’s derivative instruments consist of interest rate swaps, which are accounted for as cash flow hedges. The Company’s derivative positions are classified within Level 2 of the fair value hierarchy and are valued using models generally accepted in the financial services industry and that use actively quoted or observable market input values from external market data providers and/or nonbinding broker-dealer quotations. The fair value of the derivatives are determined using discounted cash flow models. These models’ key assumptions include the contractual terms of the respective contract along with significant observable inputs, including interest rates, yield curves, nonperformance risk and volatility.
Fair Value Transfer, Policy [Policy Text Block]	The Company’s policy is to recognize transfers between Levels at the end of each reporting period, if applicable.
Fair Value of Financial Instruments, Policy [Policy Text Block]	GAAP requires disclosure of the fair value of financial assets and liabilities, including those that are not measured and reported at fair value on a recurring or nonrecurring basis.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The calculation of earnings per common share and diluted earnings per common share is presented below for the years ended December 31, 2018 , 2017 and 2016 . (in thousands, except per share data) 2018 2017 2016 Net income $ 28,508 $ 23,070 $ 23,016 Weighted average common shares outstanding 16,275 16,194 16,117 Weighted average effect of restricted stock units outstanding 125 141 54 Diluted weighted average common shares outstanding 16,400 16,335 16,171 Basic earnings per common share $ 1.75 $ 1.42 $ 1.43 Diluted earnings per common share $ 1.74 $ 1.41 $ 1.42 Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation 103 — 102

Investment securities (Tables)

Investment securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Unrealized Gain (Loss) on Investments [Table Text Block]	The following tables show the amortized cost, gross unrealized gains and losses and fair value of investment securities, by investment security type as of December 31, 2018 and 2017 . 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities available for sale: State and political subdivisions $ 152,293 $ 156 $ (3,293 ) $ 149,156 Collateralized mortgage obligations (1) 161,392 — (4,388 ) 157,004 Mortgage-backed securities (1) 64,813 — (1,435 ) 63,378 Asset-backed securities (2) 32,076 2 (175 ) 31,903 Trust preferred security 2,153 — (253 ) 1,900 Corporate notes 51,862 124 (1,569 ) 50,417 $ 464,589 $ 282 $ (11,113 ) $ 453,758 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities available for sale: State and political subdivisions $ 146,331 $ 928 $ (946 ) $ 146,313 Collateralized mortgage obligations (1) 162,631 28 (2,727 ) 159,932 Mortgage-backed securities (1) 60,956 20 (547 ) 60,429 Asset-backed securities (2) 45,539 8 (352 ) 45,195 Trust preferred security 2,134 — (128 ) 2,006 Corporate notes 30,278 331 (265 ) 30,344 $ 447,869 $ 1,315 $ (4,965 ) $ 444,219 Securities held to maturity: State and political subdivisions $ 45,527 $ 460 $ (97 ) $ 45,890 (1) All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities and real estate mortgage investment conduits guaranteed by FNMA, FHLMC or GNMA, and commercial mortgage pass-through securities guaranteed by the SBA. (2) Pass-through asset-backed securities guaranteed by the SBA, representing participating interests in pools of commercial working capital and equipment loans.
Investments Classified by Contractual Maturity Date [Table Text Block]	The amortized cost and fair value of investment securities available for sale as of December 31, 2018 , by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity. Expected maturities may differ from contractual maturities for collateralized mortgage obligations, mortgage-backed securities and asset-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, collateralized mortgage obligations, mortgage-backed securities and asset-backed securities are not included in the maturity categories within the following maturity summary. 2018 Amortized Cost Fair Value Due after one year through five years $ 3,371 $ 3,337 Due after five years through ten years 81,619 79,870 Due after ten years 121,318 118,266 206,308 201,473 Collateralized mortgage obligations, mortgage-backed and asset-backed securities 258,281 252,285 $ 464,589 $ 453,758
Schedule of Realized Gain (Loss) [Table Text Block]	The details of the sales of investment securities for the years ended December 31, 2018 , 2017 and 2016 are summarized in the following table. 2018 2017 2016 Proceeds from sales $ 75,401 $ 108,584 $ 3,054 Gross gains on sales 101 752 66 Gross losses on sales 364 426 —
Schedule of Unrealized Loss on Investments [Table Text Block]	The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of December 31, 2018 and 2017 . 2018 Less than 12 months 12 months or longer Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Securities available for sale: State and political subdivisions $ 21,264 $ (221 ) $ 102,853 $ (3,072 ) $ 124,117 $ (3,293 ) Collateralized mortgage obligations 32,230 (250 ) 124,775 (4,138 ) 157,005 (4,388 ) Mortgage-backed securities 10,960 (103 ) 51,823 (1,332 ) 62,783 (1,435 ) Asset-backed securities 6,668 (31 ) 16,486 (144 ) 23,154 (175 ) Trust preferred security — — 1,900 (253 ) 1,900 (253 ) Corporate notes 19,470 (611 ) 19,041 (958 ) 38,511 (1,569 ) $ 90,592 $ (1,216 ) $ 316,878 $ (9,897 ) $ 407,470 $ (11,113 ) 2017 Less than 12 months 12 months or longer Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Securities available for sale: State and political subdivisions $ 86,750 $ (946 ) $ — $ — $ 86,750 $ (946 ) Collateralized mortgage obligations 107,526 (1,583 ) 46,396 (1,144 ) 153,922 (2,727 ) Mortgage-backed securities 53,974 (547 ) — — 53,974 (547 ) Asset-backed securities 38,652 (352 ) — — 38,652 (352 ) Trust preferred security — — 2,006 (128 ) 2,006 (128 ) Corporate notes 14,735 (265 ) — — 14,735 (265 ) $ 301,637 $ (3,693 ) $ 48,402 $ (1,272 ) $ 350,039 $ (4,965 ) Securities held to maturity: State and political subdivisions $ 12,611 $ (70 ) $ 1,740 $ (27 ) $ 14,351 $ (97 )

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
Loans and Allowance for Loan Losses [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	Loans consisted of the following segments as of December 31, 2018 and 2017 . 2018 2017 Commercial $ 358,763 $ 347,482 Real estate: Construction, land and land development 245,810 207,451 1-4 family residential first mortgages 49,052 51,044 Home equity 14,469 13,811 Commercial 1,050,025 886,114 Consumer and other 6,211 6,363 1,724,330 1,512,265 Net unamortized fees and costs (2,500 ) (1,765 ) $ 1,721,830 $ 1,510,500
Schedule of Loan Transactions with Related Parties [Table Text Block]	Loan transactions with related parties were as follows for the years ended December 31, 2018 and 2017 . 2018 2017 Balance, beginning of year $ 165,097 $ 191,697 New loans 9,387 28,975 Repayments (21,008 ) (55,575 ) Balance, end of year $ 153,476 $ 165,097
Schedule of Impaired Loans With and Without an Allowance [Table Text Block]	The following table summarizes the recorded investment in impaired loans by segment, broken down by loans with no related allowance and loans with a related allowance and the amount of that allowance as of December 31, 2018 and 2017 . December 31, 2018 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: Commercial $ 1,014 $ 1,014 $ — $ — $ — $ — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages 106 106 — 91 91 — Home equity 41 41 — 172 172 — Commercial 652 652 — 220 220 — Consumer and other — — — — — — 1,813 1,813 — 483 483 — With an allowance recorded: Commercial 15 15 15 — — — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages — — — — — — Home equity — — — 21 21 21 Commercial 100 100 100 118 118 118 Consumer and other — — — — — — 115 115 115 139 139 139 Total: Commercial 1,029 1,029 15 — — — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages 106 106 — 91 91 — Home equity 41 41 — 193 193 21 Commercial 752 752 100 338 338 118 Consumer and other — — — — — — Total impaired loans $ 1,928 $ 1,928 $ 115 $ 622 $ 622 $ 139 The balance of impaired loans at December 31, 2018 was composed of loans to ten different borrowers, and the balance of impaired loans at December 31, 2017 was composed of loans to five different borrowers. As of December 31, 2018 , $250 of total impaired loans to four of the borrowers was also considered impaired as of December 31, 2017 . The Company has no commitments to advance additional funds on any of the impaired loans. The following table summarizes the average recorded investment and interest income recognized on impaired loans by segment for the years ended December 31, 2018 , 2017 and 2016 . December 31, 2018 December 31, 2017 December 31, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial $ 738 $ — $ 19 $ — $ 3 $ — Real estate: Construction, land and land development — — — — 8 — 1-4 family residential first mortgages 113 — 99 — 212 1 Home equity 122 6 39 2 3 — Commercial 600 — 276 — 393 — Consumer and other — — — — — — 1,573 6 433 2 619 1 With an allowance recorded: Commercial 1 — 60 7 127 — Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages — — — — — — Home equity 15 — 177 1 263 — Commercial 109 — 127 — 145 — Consumer and other — — — — — — 125 — 364 8 535 — Total: Commercial 739 — 79 7 130 — Real estate: Construction, land and land development — — — — 8 — 1-4 family residential first mortgages 113 — 99 — 212 1 Home equity 137 6 216 3 266 — Commercial 709 — 403 — 538 — Consumer and other — — — — — — Total impaired loans $ 1,698 $ 6 $ 797 $ 10 $ 1,154 $ 1
Past Due Loans [Table Text Block]	The following tables provide an analysis of the payment status of the recorded investment in loans as of December 31, 2018 and 2017 . December 31, 2018 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Total Past Due Current Nonaccrual Loans Total Loans Commercial $ 54 $ — $ — $ 54 $ 357,680 $ 1,029 $ 358,763 Real estate: Construction, land and land development — — — — 245,810 — 245,810 1-4 family residential first mortgages 157 — — 157 48,789 106 49,052 Home equity — — — — 14,428 41 14,469 Commercial — — — — 1,049,273 752 1,050,025 Consumer and other — — — — 6,211 — 6,211 Total $ 211 $ — $ — $ 211 $ 1,722,191 $ 1,928 $ 1,724,330 December 31, 2017 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Total Past Due Current Nonaccrual Loans Total Loans Commercial $ 40 $ 20 $ — $ 60 $ 347,422 $ — $ 347,482 Real estate: Construction, land and land development — — — — 207,451 — 207,451 1-4 family residential first mortgages — 75 — 75 50,878 91 51,044 Home equity — — — — 13,618 193 13,811 Commercial — — — — 885,776 338 886,114 Consumer and other — — — — 6,363 — 6,363 Total $ 40 $ 95 $ — $ 135 $ 1,511,508 $ 622 $ 1,512,265
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	TDR loans totaled $652 and $220 as of December 31, 2018 and 2017 , respectively, and were included in the nonaccrual category. There was one loan modification considered to be TDR that occurred during the year ended December 31, 2018 and no loan modifications considered to be TDR that occurred during the years ended December 31, 2017 and 2016 . The pre- and post-modification recorded investment in TDR loans that have occurred during the years ended December 31, 2018 , 2017 and 2016 , totaled $560 , $0 and $0 , respectively. The financial impact of charge-offs or specific reserves for these modified loans was immaterial. TDR loans that have been modified within the twelve months ended December 31, 2018 , 2017 and 2016 , which have subsequently had a payment default, totaled $544 , $0 and $0 , respectively. A TDR loan is considered to have a payment default when it is past due 30 days or more.
Financing Receivable Credit Quality Indicators [Table Text Block]	The following tables show the recorded investment in loans by credit quality indicator and loan segment as of December 31, 2018 and 2017 . December 31, 2018 Pass Watch Substandard Doubtful Total Commercial $ 336,861 $ 19,886 $ 2,016 $ — $ 358,763 Real estate: Construction, land and land development 245,810 — — — 245,810 1-4 family residential first mortgages 47,923 963 166 — 49,052 Home equity 14,352 46 71 — 14,469 Commercial 1,019,256 29,063 1,706 — 1,050,025 Consumer and other 6,186 — 25 — 6,211 Total $ 1,670,388 $ 49,958 $ 3,984 $ — $ 1,724,330 December 31, 2017 Pass Watch Substandard Doubtful Total Commercial $ 344,586 $ 901 $ 1,995 $ — $ 347,482 Real estate: Construction, land and land development 206,719 732 — — 207,451 1-4 family residential first mortgages 49,905 890 249 — 51,044 Home equity 13,466 54 291 — 13,811 Commercial 856,789 20,574 8,751 — 886,114 Consumer and other 6,327 36 — — 6,363 Total $ 1,477,792 $ 23,187 $ 11,286 $ — $ 1,512,265
Allowance for Credit Losses on Financing Receivables [Table Text Block]	The following tables detail changes in the allowance for loan losses by segment for the years ended December 31, 2018 , 2017 and 2016 . 2018 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 3,866 $ 2,213 $ 319 $ 186 $ 9,770 $ 76 $ 16,430 Charge-offs (208 ) — — (24 ) — (3 ) (235 ) Recoveries 673 — 18 24 13 16 744 Provision (1) (823 ) 171 (87 ) (15 ) 518 (14 ) (250 ) Ending balance $ 3,508 $ 2,384 $ 250 $ 171 $ 10,301 $ 75 $ 16,689 2017 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 3,881 $ 2,639 $ 317 $ 478 $ 8,697 $ 100 $ 16,112 Charge-offs (199 ) — — (176 ) — — (375 ) Recoveries 232 398 15 28 13 7 693 Provision (1) (48 ) (824 ) (13 ) (144 ) 1,060 (31 ) — Ending balance $ 3,866 $ 2,213 $ 319 $ 186 $ 9,770 $ 76 $ 16,430 2016 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 4,369 $ 2,338 $ 508 $ 481 $ 7,254 $ 17 $ 14,967 Charge-offs (125 ) (141 ) (93 ) — — (47 ) (406 ) Recoveries 218 217 59 36 13 8 551 Provision (1) (581 ) 225 (157 ) (39 ) 1,430 122 1,000 Ending balance $ 3,881 $ 2,639 $ 317 $ 478 $ 8,697 $ 100 $ 16,112 (1) The negative provisions for the various segments are either related to the decline in outstanding balances in each of those portfolio segments during the time periods disclosed and/or improvement in the credit quality factors related to those portfolio segments.
Allowance for Loan Loss by Impairment Method [Table Text Block]	The following tables show a breakdown of the allowance for loan losses disaggregated on the basis of impairment analysis method by segment as of December 31, 2018 and 2017 . December 31, 2018 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 15 $ — $ — $ — $ 100 $ — $ 115 Collectively evaluated for impairment 3,493 2,384 250 171 10,201 75 16,574 Total $ 3,508 $ 2,384 $ 250 $ 171 $ 10,301 $ 75 $ 16,689 December 31, 2017 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ — $ — $ — $ 21 $ 118 $ — $ 139 Collectively evaluated for impairment 3,866 2,213 319 165 9,652 76 16,291 Total $ 3,866 $ 2,213 $ 319 $ 186 $ 9,770 $ 76 $ 16,430
Loans by Impairment Method [Table Text Block]	The following tables show the recorded investment in loans, exclusive of unamortized fees and costs, disaggregated on the basis of impairment analysis method by segment as of December 31, 2018 and 2017 . December 31, 2018 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 1,029 $ — $ 106 $ 41 $ 752 $ — $ 1,928 Collectively evaluated for impairment 357,734 245,810 48,946 14,428 1,049,273 6,211 1,722,402 Total $ 358,763 $ 245,810 $ 49,052 $ 14,469 $ 1,050,025 $ 6,211 $ 1,724,330 December 31, 2017 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ — $ — $ 91 $ 193 $ 338 $ — $ 622 Collectively evaluated for impairment 347,482 207,451 50,953 13,618 885,776 6,363 1,511,643 Total $ 347,482 $ 207,451 $ 51,044 $ 13,811 $ 886,114 $ 6,363 $ 1,512,265

Premises and Equipment, Net (Ta

Premises and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment [Table Text Block]	Premises and equipment consisted of the following as of December 31, 2018 and 2017 . 2018 2017 Land $ 4,323 $ 4,323 Buildings 14,120 14,423 Leasehold improvements 3,941 3,880 Furniture and equipment 7,927 7,946 30,311 30,572 Accumulated depreciation (8,820 ) (7,550 ) $ 21,491 $ 23,022

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Schedule of Maturities of Time Deposits [Table Text Block]	The scheduled maturities of time deposits were as follows as of December 31, 2018 . 2019 $ 161,204 2020 26,598 2021 9,279 2022 6,091 2023 4,237 $ 207,409

Federal Home Loan Bank Advanc_2

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2018
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances Maturities Summary [Table Text Block]	The following table presents the terms of all FHLB advances as of December 31, 2018 and 2017 . December 31, 2018 December 31, 2017 Maturity Interest Effective Interest Effective Date Variable/Fixed Rate Rate (1) Balance Rate Rate (1) Balance 1/18/2019 Fixed 2.66% 2.66% $ 30,000 — — $ — 1/25/2019 Fixed 2.64% 2.64% 30,000 — — — 12/23/2019 Variable 3.08% 5.03% 25,000 1.93 % 3.90 % 25,000 6/22/2020 Variable 3.10% 5.20% 25,000 1.95 % 4.09 % 25,000 9/21/2020 Variable 3.10% 4.44% 30,000 1.95 % 4.44 % 30,000 140,000 80,000 Discount for modification (2,122 ) (3,618 ) Total FHLB advances, net of discount $ 137,878 $ 76,382 (1) The effective interest rate for the variable-rate advances includes the effects of the discount fee amortization and interest rate swaps, if applicable.

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Instruments [Abstract]
Schedule of Maturities of Long-term Debt [Table Text Block]	Future required principal payments for long-term debt as of December 31, 2018 are shown in the table below. 2019 $ 2,615 2020 2,616 2021 2,537 2022 7,786 2023 — Thereafter 11,486 $ 27,040

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The table below identifies the balance sheet category and fair values of the Company’s derivative instruments designated as cash flow hedges as of December 31, 2018 and 2017 . Notional Amount Fair Value Balance Sheet Category Weighted Average Receive Rate Weighted Average Pay Rate Maturity December 31, 2018 Interest rate swap $ 30,000 $ 221 Other Assets 3.10 % 2.52 % 9/21/2020 Interest rate swap (1) 20,000 1,199 Other Assets 5.85 % 4.81 % 9/30/2026 Interest rate swap (2) 60,000 443 Other Assets 2.50 % 2.31 % 12/31/2025 December 31, 2017 Interest rate swap $ 30,000 $ (86 ) Other Liabilities 1.95 % 2.52 % 9/21/2020 Interest rate swap (1) 20,000 895 Other Assets — % 4.81 % 9/30/2026
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The following table identifies the pretax gains or losses recognized on the Company’s derivative instruments designated as cash flow hedges for the years ended December 31, 2018 , 2017 and 2016 . Amount of Pretax Reclassified from AOCI into Income Gain (Loss) Years Ended: Recognized in OCI Category Amount of Loss December 31, 2018 $ 1,044 Interest Expense $ (105 ) December 31, 2017 $ (66 ) Interest Expense $ (413 ) December 31, 2016 $ 882 Interest Expense $ (573 )

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The following table shows the components of income taxes for the years ended December 31, 2018 , 2017 and 2016 . 2018 2017 2016 Current: Federal $ 5,012 $ 8,822 $ 8,220 State 1,907 1,713 1,627 Deferred: Federal (277 ) 2,527 115 State (82 ) 306 (26 ) Income taxes $ 6,560 $ 13,368 $ 9,936
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Total income taxes for the year ended December 31, 2018 differed from the amount computed by applying the U.S. federal income tax rate of 21 percent to income before income taxes, and for the years ended December 31, 2017 and 2016 , total income taxes differed by the amount computed by applying the U.S. federal income tax rate of 35 percent to income before income taxes as shown in the following table. 2018 2017 2016 Amount Percent of Pretax Income Amount Percent of Pretax Income Amount Percent of Pretax Income Computed expected tax expense $ 7,364 21.0 % $ 12,753 35.0 % $ 11,533 35.0 % State income tax expense, net of federal income tax benefit 1,425 4.1 % 1,146 3.2 % 1,004 3.0 % Tax-exempt interest income (1,390 ) (4.0 )% (2,023 ) (5.6 )% (1,823 ) (5.5 )% Nondeductible interest expense to own tax-exempt securities 231 0.7 % 152 0.4 % 58 0.2 % Tax-exempt increase in cash value of life insurance and gains (132 ) (0.4 )% (336 ) (0.9 )% (381 ) (1.2 )% Stock compensation (219 ) (0.6 )% (261 ) (0.7 )% — — Effect of change in federal income tax rate — — 2,340 6.4 % — — Amended tax returns 222 0.6 % — — — — Federal income tax credits (1,140 ) (3.3 )% (410 ) (1.1 )% (405 ) (1.2 )% Other, net 199 0.6 % 7 — (50 ) (0.1 )% Income taxes $ 6,560 18.7 % $ 13,368 36.7 % $ 9,936 30.2 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	Net deferred tax assets consisted of the following components as of December 31, 2018 and 2017 . 2018 2017 Deferred tax assets: Allowance for loan losses $ 4,172 $ 4,108 Net unrealized losses on securities available for sale 2,708 902 Intangibles — 101 Accrued expenses 346 176 Restricted stock unit compensation 704 544 State net operating loss carryforward 1,021 1,379 Other 67 86 9,018 7,296 Deferred tax liabilities: Deferred loan costs 183 193 Net unrealized gains on interest rate swaps 429 139 Premises and equipment 694 792 Other 173 148 1,479 1,272 Net deferred tax assets before valuation allowance 7,539 6,024 Valuation allowance for deferred tax assets (1,021 ) (1,379 ) Net deferred tax assets $ 6,518 $ 4,645

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]	The following table includes a summary of nonvested RSU activity for the years ended December 31, 2018 , 2017 and 2016 . 2018 2017 2016 Weighted Weighted Weighted Average Average Average Grant Date Grant Date Grant Date Fair Value Fair Value Fair Value (actual amounts, not in thousands) Shares Per Share Shares Per Share Shares Per Share Nonvested shares, beginning balance 339,300 $ 19.55 307,268 $ 17.46 261,833 $ 16.67 Granted 136,500 25.81 138,500 22.06 141,000 18.44 Vested (121,450 ) 19.05 (106,468 ) 16.79 (95,565 ) 16.74 Forfeited — — — — — — Nonvested shares, ending balance 354,350 $ 22.13 339,300 $ 19.55 307,268 $ 17.46

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Note 14. Accumulated Other Comprehensive Income (Loss) The following table summarizes the changes in the balances of each component of AOCI, net of tax, for the years ended December 31, 2018 , 2017 and 2016 . Unrealized Accumulated Unrealized Gains Other Gains (Losses) (Losses) on Comprehensive on Securities Derivatives Income (Loss) Balance, December 31, 2015 $ 342 $ (772 ) $ (430 ) Other comprehensive income (loss) before reclassifications (1,394 ) 547 (847 ) Amounts reclassified from accumulated other comprehensive income (120 ) 355 235 Net current period other comprehensive income (loss) (1,514 ) 902 (612 ) Balance, December 31, 2016 (1,172 ) 130 (1,042 ) Other comprehensive (loss) before reclassifications (697 ) (41 ) (738 ) Amounts reclassified from accumulated other comprehensive income (368 ) 256 (112 ) Net current period other comprehensive income (loss) (1,065 ) 215 (850 ) Balance, December 31, 2017 (2,237 ) 345 (1,892 ) Transfer of securities held to maturity to securities available for sale 273 — 273 Other comprehensive income (loss) before reclassifications (5,856 ) 784 (5,072 ) Amounts reclassified from accumulated other comprehensive income 172 75 247 Net current period other comprehensive income (loss) (5,411 ) 859 (4,552 ) Reclassification of stranded tax effects (475 ) 105 (370 ) Balance, December 31, 2018 $ (8,123 ) $ 1,309 $ (6,814 )

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	The Company’s and West Bank’s capital amounts and ratios are presented in the following table as of December 31, 2018 and 2017 . Actual For Capital Adequacy Purposes For Capital Adequacy Purposes With Capital Conservation Buffer To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio As of December 31, 2018: Total Capital (to Risk-Weighted Assets) Consolidated $ 234,526 11.50 % $ 163,213 8.00 % $ 201,466 9.875 % N/A N/A West Bank 245,962 12.07 % 163,076 8.00 % 201,297 9.875 % $ 203,845 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 217,837 10.68 % 122,410 6.00 % 160,663 7.875 % N/A N/A West Bank 229,273 11.25 % 122,307 6.00 % 160,528 7.875 % 163,076 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 197,837 9.70 % 91,807 4.50 % 130,060 6.375 % N/A N/A West Bank 229,273 11.25 % 91,730 4.50 % 129,951 6.375 % 132,499 6.50 % Tier 1 Capital (to Average Assets) Consolidated 217,837 9.74 % 89,485 4.00 % 89,485 4.00 % N/A N/A West Bank 229,273 10.26 % 89,410 4.00 % 89,410 4.00 % 111,762 5.00 % As of December 31, 2017: Total Capital (to Risk-Weighted Assets) Consolidated $ 216,420 11.76 % $ 147,169 8.00 % $ 170,164 9.250 % N/A N/A West Bank 235,570 12.82 % 147,049 8.00 % 170,026 9.250 % $ 183,812 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 199,990 10.87 % 110,377 6.00 % 133,372 7.250 % N/A N/A West Bank 219,140 11.92 % 110,287 6.00 % 133,263 7.250 % 147,049 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 179,990 9.78 % 82,783 4.50 % 105,778 5.750 % N/A N/A West Bank 219,140 11.92 % 82,715 4.50 % 105,692 5.750 % 119,478 6.50 % Tier 1 Capital (to Average Assets) Consolidated 199,990 9.60 % 83,326 4.00 % 83,326 4.00 % N/A N/A West Bank 219,140 10.52 % 83,287 4.00 % 83,287 4.00 % 104,109 5.00 %

Commitments and Contingencies_2

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Total estimated minimum rental commitments were as follows as of December 31, 2018 . 2019 $ 1,534 2020 1,534 2021 1,479 2022 1,448 2023 1,457 Thereafter 3,858 $ 11,310
Summary Of Outstanding Commitments To Extend Credit And Letters Of Credit [Table Text Block]	The Company’s commitments consisted of the following approximate amounts as of December 31, 2018 and 2017 . 2018 2017 Commitments to extend credit $ 641,581 $ 617,949 Standby letters of credit 6,631 5,996 $ 648,212 $ 623,945

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	The following tables present the balances of financial assets and liabilities measured at fair value on a recurring basis by level as of December 31, 2018 and 2017 . 2018 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: State and political subdivisions $ 149,156 $ — $ 149,156 $ — Collateralized mortgage obligations 157,004 — 157,004 — Mortgage-backed securities 63,378 — 63,378 — Asset-backed securities 31,903 — 31,903 — Trust preferred security 1,900 — 1,900 — Corporate notes 50,417 — 50,417 — Derivative instrument, interest rate swaps 1,863 — 1,863 — 2017 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: State and political subdivisions $ 146,313 $ — $ 146,313 $ — Collateralized mortgage obligations 159,932 — 159,932 — Mortgage-backed securities 60,429 — 60,429 — Asset-backed securities 45,195 — 45,195 — Trust preferred security 2,006 — 2,006 — Corporate notes 30,344 — 30,344 — Derivative instrument, interest rate swap 895 — 895 — Financial liabilities: Derivative instrument, interest rate swap $ 86 $ — $ 86 $ —
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Certain assets are measured at fair value on a nonrecurring basis. That is, they are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). As of both December 31, 2018 and 2017 , impaired loans with a fair value adjustment had a net book value of $0 .
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table presents the carrying amounts and approximate fair values of financial assets and liabilities as of December 31, 2018 and 2017 . 2018 2017 Fair Value Hierarchy Level Carrying Amount Approximate Fair Value Carrying Amount Approximate Fair Value Financial assets: Cash and due from banks Level 1 $ 46,369 $ 46,369 $ 34,952 $ 34,952 Federal funds sold Level 1 1,105 1,105 12,997 12,997 Investment securities available for sale Level 2 453,758 453,758 444,219 444,219 Investment securities held to maturity Level 2 — — 45,527 45,890 Federal Home Loan Bank stock Level 1 12,037 12,037 9,174 9,174 Loans, net Level 2 1,705,141 1,688,700 1,494,070 1,490,166 Accrued interest receivable Level 1 7,631 7,631 7,344 7,344 Interest rate swaps Level 2 1,863 1,863 895 895 Financial liabilities: Deposits Level 2 $ 1,894,529 $ 1,893,621 $ 1,810,813 $ 1,810,924 Federal funds purchased Level 1 19,985 19,985 545 545 Subordinated notes, net Level 2 20,425 15,498 20,412 15,357 Federal Home Loan Bank advances, net Level 2 137,878 137,878 76,382 76,382 Long-term debt, net Level 2 27,040 27,000 22,917 22,860 Accrued interest payable Level 1 1,317 1,317 736 736 Interest rate swap Level 2 — — 86 86 Off-balance-sheet financial instruments: Commitments to extend credit Level 3 — — — — Standby letters of credit Level 3 — — — —

West Bancorporation, Inc. (Pa_2

West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Balance Sheet [Table Text Block]	Balance Sheets December 31, 2018 and 2017 2018 2017 ASSETS Cash $ 3,951 $ 3,226 Investment in West Bank 221,559 216,693 Investment in West Bancorporation Capital Trust I 619 619 Other assets 1,232 1,034 Total assets $ 227,361 $ 221,572 LIABILITIES AND STOCKHOLDERS’ EQUITY LIABILITIES Accrued expenses and other liabilities $ 663 $ 562 Subordinated notes, net 20,425 20,412 Long-term debt 15,250 22,500 Total liabilities 36,338 43,474 STOCKHOLDERS’ EQUITY Preferred stock — — Common stock 3,000 3,000 Additional paid-in capital 25,128 23,463 Retained earnings 169,709 153,527 Accumulated other comprehensive loss (6,814 ) (1,892 ) Total stockholders’ equity 191,023 178,098 Total liabilities and stockholders’ equity $ 227,361 $ 221,572
Schedule of Condensed Income Statement [Table Text Block]	Statements of Income Years Ended December 31, 2018, 2017 and 2016 2018 2017 2016 Operating income: Equity in net income of West Bank $ 30,282 $ 23,933 $ 23,544 Equity in net income of West Bancorporation Capital Trust I 33 27 23 Intercompany rental income — 333 503 Other rental income — 21 50 Total operating income 30,315 24,314 24,120 Operating expenses: Interest on subordinated notes 1,076 901 728 Interest on long-term debt 750 517 145 Occupancy — 187 280 Other expenses 530 602 443 Total operating expenses 2,356 2,207 1,596 Income before income taxes 27,959 22,107 22,524 Income tax benefits (549 ) (963 ) (492 ) Net income $ 28,508 $ 23,070 $ 23,016
Schedule of Condensed Cash Flow Statement [Table Text Block]	Statements of Cash Flows Years Ended December 31, 2018, 2017 and 2016 2018 2017 2016 Cash Flows from Operating Activities: Net income $ 28,508 $ 23,070 $ 23,016 Adjustments to reconcile net income to net cash provided by operating activities: Equity in net income of West Bank (30,282 ) (23,933 ) (23,544 ) Equity in net income of West Bancorporation Capital Trust I (33 ) (27 ) (23 ) Dividends received from West Bank 22,300 16,800 14,400 Dividends received from West Bancorporation Capital Trust I 33 27 23 Amortization 13 17 20 Depreciation — 178 244 Deferred income tax (benefits) — (240 ) 97 Change in assets and liabilities: (Increase) decrease in other assets 107 50 (79 ) Increase (decrease) in accrued expenses and other liabilities 25 (549 ) 641 Net cash provided by operating activities 20,671 15,393 14,795 Cash Flows from Investing Activities: Proceeds from sales of premises — 18,032 — Purchases of premises — (16 ) (10,539 ) Capital contribution to West Bank — (40,000 ) — Net cash (used in) investing activities — (21,984 ) (10,539 ) Cash Flows from Financing Activities: Proceeds from long-term debt — 22,000 — Principal payments on long-term debt (7,250 ) (4,629 ) (3,286 ) Common stock cash dividends (12,696 ) (11,499 ) (10,800 ) Net cash provided by (used in) financing activities (19,946 ) 5,872 (14,086 ) Net increase (decrease) in cash 725 (719 ) (9,830 ) Cash: Beginning 3,226 3,945 13,775 Ending $ 3,951 $ 3,226 $ 3,945

Selected Quarterly Financial _2

Selected Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	2018 Three months ended March 31 June 30 September 30 December 31 Interest income $ 19,730 $ 20,537 $ 21,920 $ 22,606 Interest expense 4,314 5,238 6,233 6,950 Net interest income 15,416 15,299 15,687 15,656 Provision for loan losses 150 — (400 ) — Net interest income after provision for loan losses 15,266 15,299 16,087 15,656 Noninterest income 1,913 2,023 2,114 1,702 Noninterest expense 8,287 8,958 8,561 9,186 Income before income taxes 8,892 8,364 9,640 8,172 Income taxes 1,508 1,600 2,507 945 Net income $ 7,384 $ 6,764 $ 7,133 $ 7,227 Basic earnings per common share $ 0.46 $ 0.42 $ 0.44 $ 0.44 Diluted earnings per common share $ 0.45 $ 0.41 $ 0.43 $ 0.44 2017 Three months ended March 31 June 30 September 30 December 31 Interest income $ 16,791 $ 18,166 $ 18,560 $ 19,517 Interest expense 2,402 3,073 3,529 3,973 Net interest income 14,389 15,093 15,031 15,544 Provision for loan losses — — — — Net interest income after provision for loan losses 14,389 15,093 15,031 15,544 Noninterest income 2,160 2,316 2,264 1,908 Noninterest expense 8,043 8,172 8,020 8,032 Income before income taxes 8,506 9,237 9,275 9,420 Income taxes 2,400 2,872 2,870 5,226 Net income $ 6,106 $ 6,365 $ 6,405 $ 4,194 Basic earnings per common share $ 0.38 $ 0.39 $ 0.40 $ 0.26 Diluted earnings per common share $ 0.37 $ 0.39 $ 0.39 $ 0.26

Organization and Nature of Bu_3

Organization and Nature of Business and Summary of Significant Accounting Policies (Branches) (Details)	Dec. 31, 2018Bank_branches
Des Moines, Iowa metropolitan area branches, excluding main [Member]
Number of bank branches by location [Line Items]
Number of bank branches	7
Coralville, Iowa [Member]
Number of bank branches by location [Line Items]
Number of bank branches	1
Rochester, Minnesota [Member]
Number of bank branches by location [Line Items]
Number of bank branches	1

Organization and Nature of Bu_4

Organization and Nature of Business and Summary of Significant Accounting Policies (FHLB stock) (Details) - Federal Home Loan Bank stock [Member]	Dec. 31, 2018USD ($)
Schedule of Cost-method Investments [Line Items] (Deprecated 2018-01-31)
Federal Home Loan Bank stock, percent of total assets required	0.12%
Federal Home Loan Bank stock, percent of outstanding advances required	4.00%
Quoted market value	$ 0

Organization and Nature of Bu_5

Organization and Nature of Business and Summary of Significant Accounting Policies (Useful Lives) (Details) - Maximum [Member]	12 Months Ended
	Dec. 31, 2018
Buildings [Member]
Premises and equipment [Line Items]
Premises and equipment, useful life	40 years
Furniture and equipment [Member]
Premises and equipment [Line Items]
Premises and equipment, useful life	10 years

Organization and Nature of Bu_6

Organization and Nature of Business and Summary of Significant Accounting Policies (OREO) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other real estate owned, included in other assets	$ 0	$ 0

Organization and Nature of Bu_7

Organization and Nature of Business and Summary of Significant Accounting Policies (Trust assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Trust assets	$ 300,722	$ 306,974

Organization and Nature of Bu_8

Organization and Nature of Business and Summary of Significant Accounting Policies Organization and Nature of Business and Summary of Significant Accounting Policies (RSUs) (Details) - Restricted stock units (RSUs) [Member] - Common Stock [Member]	12 Months Ended
	Dec. 31, 2016shares
Stock compensation plan [Line Items]
Projected forfeitures on restricted stock awards	0
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	0

Organization and Nature of Bu_9

Organization and Nature of Business and Summary of Significant Accounting Policies Organization and Nature of Business and Summary of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2019	Jan. 01, 2018
Accounting Policies [Abstract]
Operating lease, right-of-use asset		$ 9,604
Operating lease, liability, current		$ 9,841
Held to maturity securities, transferred to available for sale securities, amortized cost			$ 45,527
Held to maturity securities, transferred to available for sale securities, fair market value			$ 45,890
Other comprehensive income (loss), transfers from held-to-maturity to available-for-sale securities, net of tax	$ 273
Other comprehensive income, reclassification of stranded tax effects	$ 370

Earnings per Common Share (Deta

Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 7,227	$ 7,133	$ 6,764	$ 7,384	$ 4,194	$ 6,405	$ 6,365	$ 6,106	$ 28,508	$ 23,070	$ 23,016
Weighted average common shares outstanding (shares)									16,275	16,194	16,117
Weighted average effect of restricted stock units outstanding (shares)									125	141	54
Diluted weighted average common shares outstanding (shares)									16,400	16,335	16,171
Basic earnings per common share	$ 0.44	$ 0.44	$ 0.42	$ 0.46	$ 0.26	$ 0.40	$ 0.39	$ 0.38	$ 1.75	$ 1.42	$ 1.43
Diluted earnings per common share	$ 0.44	$ 0.43	$ 0.41	$ 0.45	$ 0.26	$ 0.39	$ 0.39	$ 0.37	$ 1.74	$ 1.41	$ 1.42
Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation									103	0	102

Investment Securities Available

Investment Securities Available-for-Sale by Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	$ 464,589	$ 447,869
Investment securities available for sale, gross unrealized gains	282	1,315
Investment securities available for sale, gross unrealized losses	(11,113)	(4,965)
Investment securities available for sale	453,758	444,219
State and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	152,293	146,331
Investment securities available for sale, gross unrealized gains	156	928
Investment securities available for sale, gross unrealized losses	(3,293)	(946)
Investment securities available for sale	149,156	146,313
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	161,392	162,631
Investment securities available for sale, gross unrealized gains	0	28
Investment securities available for sale, gross unrealized losses	(4,388)	(2,727)
Investment securities available for sale	157,004	159,932
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	64,813	60,956
Investment securities available for sale, gross unrealized gains	0	20
Investment securities available for sale, gross unrealized losses	(1,435)	(547)
Investment securities available for sale	63,378	60,429
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	32,076	45,539
Investment securities available for sale, gross unrealized gains	2	8
Investment securities available for sale, gross unrealized losses	(175)	(352)
Investment securities available for sale	31,903	45,195
Trust preferred security [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	2,153	2,134
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	(253)	(128)
Investment securities available for sale	1,900	2,006
Corporate notes [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, amortized cost	51,862	30,278
Investment securities available for sale, gross unrealized gains	124	331
Investment securities available for sale, gross unrealized losses	(1,569)	(265)
Investment securities available for sale	$ 50,417	$ 30,344

Investment Securities Held-to-M

Investment Securities Held-to-Maturity by Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 0	$ 45,527
Investment securities held to maturity, fair value	$ 0	45,890
State and political subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity		45,527
Investment securities held to maturity, gross unrealized gains		460
Investment securities held to maturity, gross unrealized losses		(97)
Investment securities held to maturity, fair value		$ 45,890

Investment Securities Contractu

Investment Securities Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Securities Available for Sale, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due after one year through five years, amortized cost	$ 3,371
Due after five years through ten years, amortized cost	81,619
Due after ten years, amortized cost	121,318
Subtotal before securities without single maturities, amortized cost	206,308
Collateralized mortgage obligations, mortgage-backed and asset-backed securities, amortized cost	258,281
Investment securities available for sale, amortized cost	464,589	$ 447,869
Investment Securities Available for Sale, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due after one year through five years, fair value	3,337
Due after five years through ten years, fair value	79,870
Due after ten years, fair value	118,266
Subtotal before securities without single maturities, fair value	201,473
Collateralized mortgage obligations, mortgage-backed and asset-backed securities, fair value	252,285
Investment securities available for sale, fair value	$ 453,758	$ 444,219

Investment Securities Detail of

Investment Securities Detail of Sale of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale [Abstract]
Proceeds from sales	$ 75,401	$ 108,584	$ 3,054
Gross gains on sales	101	752	66
Gross losses on sales	$ 364	$ 426	$ 0

Investment Securities Gross Unr

Investment Securities Gross Unrealized Losses - AFS (Details) $ in Thousands	Dec. 31, 2018USD ($)securities	Dec. 31, 2017USD ($)
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 90,592	$ 301,637
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(1,216)	(3,693)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	316,878	48,402
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(9,897)	(1,272)
Investment securities available for sale, total, continuous unrealized loss position, fair value	407,470	350,039
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	(11,113)	(4,965)
State and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	21,264	86,750
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(221)	(946)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	102,853	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(3,072)	0
Investment securities available for sale, total, continuous unrealized loss position, fair value	124,117	86,750
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (3,293)	(946)
Investment securities available for sale in unrealized loss positions, qualitative disclosure, number of positions | securities	171
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 32,230	107,526
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(250)	(1,583)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	124,775	46,396
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(4,138)	(1,144)
Investment securities available for sale, total, continuous unrealized loss position, fair value	157,005	153,922
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (4,388)	(2,727)
Investment securities available for sale in unrealized loss positions, qualitative disclosure, number of positions | securities	45
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 10,960	53,974
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(103)	(547)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	51,823	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(1,332)	0
Investment securities available for sale, total, continuous unrealized loss position, fair value	62,783	53,974
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (1,435)	(547)
Investment securities available for sale in unrealized loss positions, qualitative disclosure, number of positions | securities	18
Asset-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 6,668	38,652
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(31)	(352)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	16,486	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(144)	0
Investment securities available for sale, total, continuous unrealized loss position, fair value	23,154	38,652
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (175)	(352)
Investment securities available for sale in unrealized loss positions, qualitative disclosure, number of positions | securities	6
Trust preferred security [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 0	0
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	0	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	1,900	2,006
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(253)	(128)
Investment securities available for sale, total, continuous unrealized loss position, fair value	1,900	2,006
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (253)	(128)
Investment securities available for sale in unrealized loss positions, qualitative disclosure, number of positions | securities	1
Corporate notes [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 19,470	14,735
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(611)	(265)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	19,041	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(958)	0
Investment securities available for sale, total, continuous unrealized loss position, fair value	38,511	14,735
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (1,569)	$ (265)
Investment securities available for sale in unrealized loss positions, qualitative disclosure, number of positions | securities	15

Investment Securities Gross U_2

Investment Securities Gross Unrealized Losses - HTM (Details) - State and political subdivisions [Member] $ in Thousands	Dec. 31, 2017USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, continuous unrealized loss position, less than 12 months, fair value	$ 12,611
Investment securities held to maturity, continuous unrealized loss position, less than 12 months, gross unrealized losses	(70)
Investment securities held to maturity, continuous unrealized loss position, 12 months or longer, fair value	1,740
Investment securities held to maturity, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(27)
Investment securities held to maturity, total, continuous unrealized loss position, fair value	14,351
Investment securities held to maturity, total, continuous unrealized loss position, gross unrealized losses	$ (97)

Investment Securities Other Nar

Investment Securities Other Narratives (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities pledged as collateral at amortized cost	$ 126,531	$ 120,338

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses Schedule of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans Receivable [Line Items]
Loans	$ 1,724,330	$ 1,512,265
Net unamortized fees and costs	(2,500)	(1,765)
Loans, net of unamortized fees and costs	1,721,830	1,510,500
Loans with fixed rates of interest	1,142,413	997,642
Loans with variable rates of interest	581,917	514,623
Commercial [Member]
Loans Receivable [Line Items]
Loans	358,763	347,482
Real Estate [Member]
Loans Receivable [Line Items]
Loans pledged as collateral	800,000	810,000
Construction, land and land development [Member]
Loans Receivable [Line Items]
Loans	245,810	207,451
1-4 family residential first mortgages [Member]
Loans Receivable [Line Items]
Loans	49,052	51,044
Home equity [Member]
Loans Receivable [Line Items]
Loans	14,469	13,811
Commercial real estate [Member]
Loans Receivable [Line Items]
Loans	1,050,025	886,114
Consumer and other [Member]
Loans Receivable [Line Items]
Loans	$ 6,211	$ 6,363

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses Schedule of Loan Transactions with Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable, Related Parties [Roll Forward]
Related party loans, due from related party, beginning of year	$ 165,097	$ 191,697
Related party loans, new loans	9,387	28,975
Related party loans, repayments	(21,008)	(55,575)
Related party loans, due from related party, end of year	$ 153,476	$ 165,097

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without an Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	$ 1,813	$ 483
Impaired loans, with no related allowance, unpaid principal balance	1,813	483
Impaired loans, with related allowance, recorded investment	115	139
Impaired loans, with related allowance, unpaid principal balance	115	139
Impaired loans, recorded investment	1,928	622
Impaired loans, unpaid principal balance	1,928	622
Impaired loans, related allowance	115	139
Impaired loans, with no related allowance, average recorded investment	1,573	433	$ 619
Impaired loans, with no related allowance, interest income, accrual method	6	2	1
Impaired loans, with related allowance, average recorded investment	125	364	535
Impaired loans, with related allowance, interest income, accrual method	0	8	0
Impaired loans, average recorded investment	1,698	797	1,154
Impaired loans, interest income, accrual method	6	10	1
Impaired loans, interest lost on nonaccrual loans	96	47	72
Commercial [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	1,014	0
Impaired loans, with no related allowance, unpaid principal balance	1,014	0
Impaired loans, with related allowance, recorded investment	15	0
Impaired loans, with related allowance, unpaid principal balance	15	0
Impaired loans, recorded investment	1,029	0
Impaired loans, unpaid principal balance	1,029	0
Impaired loans, related allowance	15	0
Impaired loans, with no related allowance, average recorded investment	738	19	3
Impaired loans, with no related allowance, interest income, accrual method	0	0	0
Impaired loans, with related allowance, average recorded investment	1	60	127
Impaired loans, with related allowance, interest income, accrual method	0	7	0
Impaired loans, average recorded investment	739	79	130
Impaired loans, interest income, accrual method	0	7	0
Construction, land and land development [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	0	0
Impaired loans, with no related allowance, unpaid principal balance	0	0
Impaired loans, with related allowance, recorded investment	0	0
Impaired loans, with related allowance, unpaid principal balance	0	0
Impaired loans, recorded investment	0	0
Impaired loans, unpaid principal balance	0	0
Impaired loans, related allowance	0	0
Impaired loans, with no related allowance, average recorded investment	0	0	8
Impaired loans, with no related allowance, interest income, accrual method	0	0	0
Impaired loans, with related allowance, average recorded investment	0	0	0
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	0	0	8
Impaired loans, interest income, accrual method	0	0	0
1-4 family residential first mortgages [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	106	91
Impaired loans, with no related allowance, unpaid principal balance	106	91
Impaired loans, with related allowance, recorded investment	0	0
Impaired loans, with related allowance, unpaid principal balance	0	0
Impaired loans, recorded investment	106	91
Impaired loans, unpaid principal balance	106	91
Impaired loans, related allowance	0	0
Impaired loans, with no related allowance, average recorded investment	113	99	212
Impaired loans, with no related allowance, interest income, accrual method	0	0	1
Impaired loans, with related allowance, average recorded investment	0	0	0
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	113	99	212
Impaired loans, interest income, accrual method	0	0	1
Home equity [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	41	172
Impaired loans, with no related allowance, unpaid principal balance	41	172
Impaired loans, with related allowance, recorded investment	0	21
Impaired loans, with related allowance, unpaid principal balance	0	21
Impaired loans, recorded investment	41	193
Impaired loans, unpaid principal balance	41	193
Impaired loans, related allowance	0	21
Impaired loans, with no related allowance, average recorded investment	122	39	3
Impaired loans, with no related allowance, interest income, accrual method	6	2	0
Impaired loans, with related allowance, average recorded investment	15	177	263
Impaired loans, with related allowance, interest income, accrual method	0	1	0
Impaired loans, average recorded investment	137	216	266
Impaired loans, interest income, accrual method	6	3	0
Commercial real estate [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	652	220
Impaired loans, with no related allowance, unpaid principal balance	652	220
Impaired loans, with related allowance, recorded investment	100	118
Impaired loans, with related allowance, unpaid principal balance	100	118
Impaired loans, recorded investment	752	338
Impaired loans, unpaid principal balance	752	338
Impaired loans, related allowance	100	118
Impaired loans, with no related allowance, average recorded investment	600	276	393
Impaired loans, with no related allowance, interest income, accrual method	0	0	0
Impaired loans, with related allowance, average recorded investment	109	127	145
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	709	403	538
Impaired loans, interest income, accrual method	0	0	0
Consumer and other [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	0	0
Impaired loans, with no related allowance, unpaid principal balance	0	0
Impaired loans, with related allowance, recorded investment	0	0
Impaired loans, with related allowance, unpaid principal balance	0	0
Impaired loans, recorded investment	0	0
Impaired loans, unpaid principal balance	0	0
Impaired loans, related allowance	0	0
Impaired loans, with no related allowance, average recorded investment	0	0	0
Impaired loans, with no related allowance, interest income, accrual method	0	0	0
Impaired loans, with related allowance, average recorded investment	0	0	0
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	0	0	0
Impaired loans, interest income, accrual method	$ 0	$ 0	$ 0

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses Impaired Loans (Details) $ in Thousands	Dec. 31, 2018USD ($)Borrowers	Dec. 31, 2017Borrowers
Loans and Allowance for Loan Losses [Abstract]
Impaired loans, number of borrowers | Borrowers	10	5
Impaired loans also impaired at end of prior year, number of borrowers | Borrowers	4
Impaired loans also impaired at end of prior year | $	$ 250
Impaired loans, commitment to lend | $	$ 0

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	$ 211	$ 135
Loans, recorded investment, current	1,722,191	1,511,508
Loans, recorded investment, nonaccrual status	1,928	622
Loans	1,724,330	1,512,265
Commercial [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	54	60
Loans, recorded investment, current	357,680	347,422
Loans, recorded investment, nonaccrual status	1,029	0
Loans	358,763	347,482
Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	245,810	207,451
Loans, recorded investment, nonaccrual status	0	0
Loans	245,810	207,451
1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	157	75
Loans, recorded investment, current	48,789	50,878
Loans, recorded investment, nonaccrual status	106	91
Loans	49,052	51,044
Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	14,428	13,618
Loans, recorded investment, nonaccrual status	41	193
Loans	14,469	13,811
Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	1,049,273	885,776
Loans, recorded investment, nonaccrual status	752	338
Loans	1,050,025	886,114
Consumer and other [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	6,211	6,363
Loans, recorded investment, nonaccrual status	0	0
Loans	6,211	6,363
Loans, 30 to 59 days past due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	211	40
Loans, 30 to 59 days past due [Member] | Commercial [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	54	40
Loans, 30 to 59 days past due [Member] | Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 30 to 59 days past due [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	157	0
Loans, 30 to 59 days past due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 30 to 59 days past due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 30 to 59 days past due [Member] | Consumer and other [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 60 to 89 days past due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	95
Loans, 60 to 89 days past due [Member] | Commercial [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	20
Loans, 60 to 89 days past due [Member] | Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 60 to 89 days past due [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	75
Loans, 60 to 89 days past due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 60 to 89 days past due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 60 to 89 days past due [Member] | Consumer and other [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member] | Commercial [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member] | Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, 90 or more days past due [Member] | Consumer and other [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	$ 0	$ 0

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans and Allowance for Loan Losses [Abstract]
Troubled debt restructured loans included in nonaccrual	$ 652	$ 220
Troubled debt restructured loans	$ 652	$ 220

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loan Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loans	Dec. 31, 2017USD ($)loans	Dec. 31, 2016USD ($)loans
Loans and Allowance for Loan Losses [Abstract]
Troubled debt restructured loan modifications, pre-modification recorded investment	$ 560	$ 0	$ 0
Troubled debt restructured loan modifications, post-modification recorded investment	$ 560	$ 0	$ 0
Troubled debt restructured loan modifications, number | loans	1	0	0

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans that Subsequently Defaulted (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Allowance for Loan Losses [Abstract]
Troubled debt restructured loans, subsequent default, recorded investment	$ 544	$ 0	$ 0

Loans and Allowance for Loan_11

Loans and Allowance for Loan Losses Schedule of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans, Recorded Investment [Line Items]
Loans	$ 1,724,330	$ 1,512,265
Commercial [Member]
Loans, Recorded Investment [Line Items]
Loans	358,763	347,482
Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	245,810	207,451
1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	49,052	51,044
Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	14,469	13,811
Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	1,050,025	886,114
Consumer and other [Member]
Loans, Recorded Investment [Line Items]
Loans	6,211	6,363
Pass [Member]
Loans, Recorded Investment [Line Items]
Loans	1,670,388	1,477,792
Pass [Member] | Commercial [Member]
Loans, Recorded Investment [Line Items]
Loans	336,861	344,586
Pass [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	245,810	206,719
Pass [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	47,923	49,905
Pass [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	14,352	13,466
Pass [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	1,019,256	856,789
Pass [Member] | Consumer and other [Member]
Loans, Recorded Investment [Line Items]
Loans	6,186	6,327
Watch [Member]
Loans, Recorded Investment [Line Items]
Loans	49,958	23,187
Watch [Member] | Commercial [Member]
Loans, Recorded Investment [Line Items]
Loans	19,886	901
Watch [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	0	732
Watch [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	963	890
Watch [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	46	54
Watch [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	29,063	20,574
Watch [Member] | Consumer and other [Member]
Loans, Recorded Investment [Line Items]
Loans	0	36
Substandard [Member]
Loans, Recorded Investment [Line Items]
Loans	3,984	11,286
Substandard [Member] | Commercial [Member]
Loans, Recorded Investment [Line Items]
Loans	2,016	1,995
Substandard [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Substandard [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	166	249
Substandard [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	71	291
Substandard [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	1,706	8,751
Substandard [Member] | Consumer and other [Member]
Loans, Recorded Investment [Line Items]
Loans	25	0
Doubtful [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Commercial [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Consumer and other [Member]
Loans, Recorded Investment [Line Items]
Loans	$ 0	$ 0

Loans and Allowance for Loan_12

Loans and Allowance for Loan Losses Schedule of Allowance for Loan Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				$ 16,430				$ 16,112	$ 16,430	$ 16,112	$ 14,967
Charge-offs									(235)	(375)	(406)
Recoveries									744	693	551
Provision for loan losses	$ 0	$ (400)	$ 0	150	$ 0	$ 0	$ 0	0	(250)	0	1,000
Allowance for loan losses, ending balance	16,689				16,430				16,689	16,430	16,112
Commercial [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				3,866				3,881	3,866	3,881	4,369
Charge-offs									(208)	(199)	(125)
Recoveries									673	232	218
Provision for loan losses									(823)	(48)	(581)
Allowance for loan losses, ending balance	3,508				3,866				3,508	3,866	3,881
Construction, land and land development [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				2,213				2,639	2,213	2,639	2,338
Charge-offs									0	0	(141)
Recoveries									0	398	217
Provision for loan losses									171	(824)	225
Allowance for loan losses, ending balance	2,384				2,213				2,384	2,213	2,639
1-4 family residential first mortgages [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				319				317	319	317	508
Charge-offs									0	0	(93)
Recoveries									18	15	59
Provision for loan losses									(87)	(13)	(157)
Allowance for loan losses, ending balance	250				319				250	319	317
Home equity [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				186				478	186	478	481
Charge-offs									(24)	(176)	0
Recoveries									24	28	36
Provision for loan losses									(15)	(144)	(39)
Allowance for loan losses, ending balance	171				186				171	186	478
Commercial real estate [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				9,770				8,697	9,770	8,697	7,254
Charge-offs									0	0	0
Recoveries									13	13	13
Provision for loan losses									518	1,060	1,430
Allowance for loan losses, ending balance	10,301				9,770				10,301	9,770	8,697
Consumer and other [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance				$ 76				$ 100	76	100	17
Charge-offs									(3)	0	(47)
Recoveries									16	7	8
Provision for loan losses									(14)	(31)	122
Allowance for loan losses, ending balance	$ 75				$ 76				$ 75	$ 76	$ 100

Loans and Allowance for Loan_13

Loans and Allowance for Loan Losses Schedule of Allowance for Loan Losses Based on Impairment Method (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	$ 115	$ 139
Allowance for loan losses, collectively evaluated for impairment	16,574	16,291
Allowance for loan losses	16,689	16,430
Commercial [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	15	0
Allowance for loan losses, collectively evaluated for impairment	3,493	3,866
Allowance for loan losses	3,508	3,866
Construction, land and land development [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	2,384	2,213
Allowance for loan losses	2,384	2,213
1-4 family residential first mortgages [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	250	319
Allowance for loan losses	250	319
Home equity [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	0	21
Allowance for loan losses, collectively evaluated for impairment	171	165
Allowance for loan losses	171	186
Commercial real estate [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	100	118
Allowance for loan losses, collectively evaluated for impairment	10,201	9,652
Allowance for loan losses	10,301	9,770
Consumer and other [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	0	0
Allowance for loan losses, collectively evaluated for impairment	75	76
Allowance for loan losses	$ 75	$ 76

Loans and Allowance for Loan_14

Loans and Allowance for Loan Losses Schedule of Loans by Impairment Method (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	$ 1,928	$ 622
Loans, collectively evaluated for impairment	1,722,402	1,511,643
Loans	1,724,330	1,512,265
Commercial [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	1,029	0
Loans, collectively evaluated for impairment	357,734	347,482
Loans	358,763	347,482
Construction, land and land development [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	0	0
Loans, collectively evaluated for impairment	245,810	207,451
Loans	245,810	207,451
1-4 family residential first mortgages [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	106	91
Loans, collectively evaluated for impairment	48,946	50,953
Loans	49,052	51,044
Home equity [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	41	193
Loans, collectively evaluated for impairment	14,428	13,618
Loans	14,469	13,811
Commercial real estate [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	752	338
Loans, collectively evaluated for impairment	1,049,273	885,776
Loans	1,050,025	886,114
Consumer and other [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	0	0
Loans, collectively evaluated for impairment	6,211	6,363
Loans	$ 6,211	$ 6,363

Premises and Equipment, Net (De

Premises and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Premises and equipment [Line Items]
Premises and equipment, gross	$ 30,311	$ 30,572
Accumulated depreciation	(8,820)	(7,550)
Premises and equipment, net	21,491	23,022
Land [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	4,323	4,323
Buildings [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	14,120	14,423
Leasehold improvements [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	3,941	3,880
Furniture and equipment [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	$ 7,927	$ 7,946

Deposits Deposits (Details)

Deposits Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Time deposit maturities, 2019	$ 161,204
Time deposit maturities, 2020	26,598
Time deposit maturities, 2021	9,279
Time deposit maturities, 2022	6,091
Time deposit maturities, 2023	4,237
Time deposits, total	207,409
CDARS deposits	92,315	$ 100,091
ICS Checking Deposits	94,203	117,990
ICS Money Market Deposits	$ 232,146	$ 213,587

Subordinated Notes (Details)

Subordinated Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jul. 18, 2003
Debt Instrument [Line Items]
Subordinated notes, gross	$ 20,425,000	$ 20,412,000
Subordinated debt [Member]
Debt Instrument [Line Items]
Subordinated notes, gross			$ 20,619,000
Deferral period option, junior subordinated debentures	5 years
Dividends allowed, deferral of subordinated debt	$ 0
Term of security maturity	30 years
Debt instrument, variable interest rate period end	5.85%
Debt instrument, frequency of periodic payment	quarterly
Debt instrument, interest rate, effective percentage	5.92%
Debt instrument, unamortized discount and debt issuance costs	$ 194,000	$ 207,000
Subordinated debt with an interest rate swap contract	$ 20,000,000
Three-month LIBOR [Member] | Subordinated debt [Member]
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	3-month LIBOR
Debt instrument, basis spread on variable rate	3.05%

Federal Home Loan Bank Advanc_3

Federal Home Loan Bank Advances, Maturities Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Federal Home Loan Bank advances, gross	$ 140,000	$ 80,000
Discount for modification	(2,122)	(3,618)
Federal Home Loan Bank advances, net	$ 137,878	$ 76,382
Maturity date January 18, 2019 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Debt instrument, interest rate, stated percentage	2.66%
Debt instrument, interest rate, effective percentage	2.66%
Federal Home Loan Bank advances short-term	$ 30,000
Maturity date January 25, 2019 [Domain]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Debt instrument, interest rate, stated percentage	2.64%
Debt instrument, interest rate, effective percentage	2.64%
Federal Home Loan Bank advances short-term	$ 30,000
Maturity date December 23, 2019 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Debt instrument, variable interest rate period end	3.08%	1.93%
Debt instrument, interest rate, effective percentage	5.03%	3.90%
Federal Home Loan Bank advances long-term	$ 25,000	$ 25,000
Maturity date June 22, 2020 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Debt instrument, variable interest rate period end	3.10%	1.95%
Debt instrument, interest rate, effective percentage	5.20%	4.09%
Federal Home Loan Bank advances long-term	$ 25,000	$ 25,000
Maturity date September 21, 2020 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Debt instrument, variable interest rate period end	3.10%	1.95%
Debt instrument, interest rate, effective percentage	4.44%	4.44%
Federal Home Loan Bank advances long-term	$ 30,000	$ 30,000

Federal Home Loan Bank Advanc_4

Federal Home Loan Bank Advances (Other Narratives) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 21, 2012
Line of Credit Facility [Line Items]
Federal Home Loan Bank advances, modified				$ 80,000,000
Debt instrument, unamortized prepayment discount, gross				$ 11,152,000
Amortization of debt prepayment discount	$ 1,496,000	$ 1,496,000	$ 1,501,000
Additional borrowing capacity, Federal Home Loan Bank advances	289,000,000
Federal funds lines of credit at correspondent banks [Member]
Line of Credit Facility [Line Items]
Amount outstanding, line of credit	0
Federal funds lines of credit at correspondent banks [Member] | Unsecured debt [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity, line of credit	67,000,000
Maturity date September 21, 2020 [Member]
Line of Credit Facility [Line Items]
Federal Loan Home Bank advances with an interest rate swap contract	$ 30,000,000

Long-term debt (Details)

Long-term debt (Details) - USD ($)	Dec. 21, 2018	May 25, 2017	Jun. 30, 2013	Dec. 31, 2018	Dec. 31, 2017
Secured debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 25,000,000
Debt instrument, term		5 years
Debt instrument, frequency of periodic payment		quarterly
Debt instrument, periodic payment, principal		$ 625,000
Debt instrument, gross				$ 15,250,000	$ 22,500,000
Secured debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.95%
Debt instrument, description of variable rate basis		30-day LIBOR
Debt instrument, interest rate, effective percentage				4.33%
Contract payable [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 765,000
Debt instrument, term			9 years
Debt instrument, gross				$ 304,000	$ 417,000
Debt instrument, interest rate, stated percentage			1.25%
Special purpose subsidiary debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 11,486,000
Debt instrument, term	23 years
Debt instrument, frequency of periodic payment	monthly
Debt instrument, gross				$ 11,486,000
Debt instrument, interest rate, stated percentage	1.00%

Long-term debt Maturities of lo

Long-term debt Maturities of long-term debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Long-term Debt, Unclassified [Abstract]
Long-term debt, maturities, repayments of principal in next twelve months	$ 2,615
Long-term debt, maturities, repayments of principal in year two	2,616
Long-term debt, maturities, repayments of principal in year three	2,537
Long-term debt, maturities, repayments of principal in year four	7,786
Long-term debt, maturities, repayments of principal in year five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	11,486
Long-term debt	$ 27,040	$ 22,917

Derivatives (Details)

Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2015	Jan. 04, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Cash pledged as collateral				$ 0	$ 210
Interest Rate Swap [Member] | Counterparties [Member]
Derivatives, Fair Value [Line Items]
Cash pledged as collateral				2,410	980
Cash flow hedging [Member] | Interest rate swap due September 30, 2026 [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount				$ 20,000	$ 20,000
Derivative, weighted average receive rate				5.85%	0.00%
Derivative, weighted average pay rate				4.81%	4.81%
Cash flow hedging [Member] | Interest rate swap due September 30, 2026 [Member] | Designated as hedging instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Interest rate cash flow hedge asset at fair value				$ 1,199	$ 895
Cash flow hedging [Member] | Interest rate swap due December 31, 2025 [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount				$ 60,000
Derivative, weighted average receive rate				2.50%
Derivative, weighted average pay rate				2.31%
Cash flow hedging [Member] | Interest rate swap due December 31, 2025 [Member] | Designated as hedging instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Interest rate cash flow hedge asset at fair value				$ 443
Cash flow hedging [Member] | Interest Rate Swap due September 21 2020 [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount				$ 30,000	$ 30,000
Derivative, weighted average receive rate				3.10%	1.95%
Derivative, weighted average pay rate				2.52%	2.52%
Cash flow hedging [Member] | Interest Rate Swap due September 21 2020 [Member] | Designated as hedging instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate cash flow hedge liability at fair value					$ (86)
Cash flow hedging [Member] | Interest Rate Swap due September 21 2020 [Member] | Designated as hedging instrument [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Interest rate cash flow hedge asset at fair value				$ 221
Cash flow hedging [Member] | Interest rate swap due February 8, 2024 [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount			$ 25,000
Derivative, weighted average pay rate			2.57%
Cash flow hedging [Member] | Interest rate swap due January 8, 2026 [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount			$ 25,000
Derivative, weighted average pay rate			2.62%
Cash flow hedging [Member] | Terminated interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Derivative termination fee paid		$ 541
Cash flow hedging [Member] | Terminated interest rate swap [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 70,000
Scenario, forecast [Member] | Cash flow hedging [Member] | Interest Rate Swap [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments, gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred	$ 404

Derivatives Pre-Tax Losses (Det

Derivatives Pre-Tax Losses (Details) - Designated as hedging instrument [Member] - Interest rate swap [Member] - Cash flow hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedge ineffectiveness, net		$ 0	$ 0
Effective portion [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized holding gains (losses) on derivatives arising during the period	$ 1,044	(66)	882
Effective portion [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated oci into income, effective portion, net	$ (105)	$ (413)	$ (573)

Income Taxes Schedule of Compon

Income Taxes Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current federal income tax expense									$ 5,012	$ 8,822	$ 8,220
Current state income tax expense									1,907	1,713	1,627
Deferred federal income tax expense									(277)	2,527	115
Deferred state income tax expense									(82)	306	(26)
Income tax expense	$ 945	$ 2,507	$ 1,600	$ 1,508	$ 5,226	$ 2,870	$ 2,872	$ 2,400	$ 6,560	$ 13,368	$ 9,936

Income Taxes Schedule of Effect

Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax reconciliation, income tax expense, at federal statutory income tax rate, amount									$ 7,364	$ 12,753	$ 11,533
Effective income tax rate reconciliation, at federal statutory income tax rate, percent									21.00%	35.00%	35.00%
Income tax reconciliation, state income taxes, amount									$ 1,425	$ 1,146	$ 1,004
Effective income tax rate reconciliation, state income taxes, percent									4.10%	3.20%	3.00%
Income tax reconciliation, tax exempt interest income, amount									$ (1,390)	$ (2,023)	$ (1,823)
Effective income rate tax reconciliation, tax exempt interest income, percent									(4.00%)	(5.60%)	(5.50%)
Income tax reconciliation, nondeductible interest expense to own tax-exempts, amount									$ 231	$ 152	$ 58
Effective income tax rate reconciliation, nondeductible interest expense to own tax-exempts, percent									0.70%	0.40%	0.20%
Income tax reconciliation, tax-exempt increase in cash value of life insurance and gains, amount									$ (132)	$ (336)	$ (381)
Effective income tax rate reconciliation, tax-exempt increase in cash value of life insurance and gains, percent									(0.40%)	(0.90%)	(1.20%)
Income tax reconciliation, share based compensation excess tax benefit, amount									$ (219)	$ (261)	$ 0
Effective income tax reconciliation, share based compensation excess tax benefit, percent									(0.60%)	(0.70%)	(0.00%)
Income tax reconciliation, change in enacted tax rate, amount									$ 0	$ 2,340	$ 0
Effective income tax rate reconciliation,change in enacted rate, percent									0.00%	6.40%	0.00%
Income tax reconciliation, amended tax returns, amount									$ 222	$ 0	$ 0
Effective income tax reconciliation, amended tax returns, percent									(0.60%)	0.00%	0.00%
Income tax reconciliation, federal income tax credits, amount									$ (1,140)	$ (410)	$ (405)
Effective income tax rate reconciliation, federal income tax credits, percent									(3.30%)	(1.10%)	(1.20%)
Income tax reconciliation, other adjustments, amount									$ 199	$ 7	$ (50)
Effective income tax rate reconciliation, other adjustments, percent									0.60%	0.00%	(0.10%)
Income tax expense	$ 945	$ 2,507	$ 1,600	$ 1,508	$ 5,226	$ 2,870	$ 2,872	$ 2,400	$ 6,560	$ 13,368	$ 9,936
Effective income tax rate									18.70%	36.70%	30.20%

Income Taxes Schedule of Deferr

Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax assets, allowance for loan losses	$ 4,172	$ 4,108
Deferred tax assets, unrealized losses on securities available for sale	2,708	902
Deferred tax assets, intangible assets	0	101
Deferred tax assets, accrued expenses	346	176
Deferred tax assets, restricted stock unit compensation	704	544
Deferred tax assets, state net operating loss carryforward	1,021	1,379
Deferred tax assets, other	67	86
Deferred tax assets, gross	9,018	7,296
Deferred tax liabilities, deferred loan costs	183	193
Deferred tax liabilities, net unrealized gains on interest rate swaps	429	139
Deferred tax liabilities, premises and equipment	694	792
Deferred tax liabilities, other	173	148
Deferred tax liabilities, gross	1,479	1,272
Deferred tax assets, net, before valuation allowance	7,539	6,024
Valuation allowance	(1,021)	(1,379)
Deferred tax assets, net	$ 6,518	$ 4,645

Income Taxes Schedule of Operat

Income Taxes Schedule of Operating Loss Carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 25,526
Minimum [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards, expiration dates	Dec. 31, 2020

Income Taxes Schedule of Penalt

Income Taxes Schedule of Penalties and Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Material income tax interest and penalties recognized	$ 0	$ 0	$ 0

Stock Compensation Plans Restri

Stock Compensation Plans Restricted Stock Unit Activity (Details) - Restricted stock units (RSUs) [Member] - Common stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Stock compensation plan, restricted stock, outstanding beginning of period (number of shares)	339,300	307,268	261,833
Stock compensation plan, restricted stock, grants in period (number of shares)	136,500	138,500	141,000
Stock compensation plan, restricted stock, vested in period (number of shares)	(121,450)	(106,468)	(95,565)
Stock compensation plan, restricted stock, forfeited in period (number of shares)	0	0	0
Stock compensation plan, restricted stock, outstanding end of period (number of shares)	354,350	339,300	307,268
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Stock compensation plan, restricted stock, outstanding beginning of period, weighted average grant date fair value ($ per share)	$ 19.55	$ 17.46	$ 16.67
Stock compensation plan, restricted stock, grants in period, weighted average grant date fair value ($ per share)	25.81	22.06	18.44
Stock compensation plan, restricted stock, vested in period, weighted average grant date fair value ($ per share)	19.05	16.79	16.74
Stock compensation plan, restricted stock, forfeitures, weighted average grant date fair value ($ per share)	0	0	0
Stock compensation plan, restricted stock, outstanding end of period, weighted average grand date fair value ($ per share)	$ 22.13	$ 19.55	$ 17.46

Stock Compensation Plans Narrat

Stock Compensation Plans Narratives (Details) - Common stock [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted stock units (RSUs) [Member]
Stock compensation plan [Line Items]
Restricted stock or unit expense	$ 0
Shares of common stock per restricted stock unit	1
Stock compensation plan, restricted stock, vested in period, fair value	$ 3,144	$ 2,371	$ 1,730
Stock compensation expense	2,741	2,632	1,684
Stock compensation plan, tax benefit from compensation expense	261	$ 285	$ 105
Stock compensation plan, restricted stock, nonvested awards, compensation not yet recognized	$ 4,235
Stock compensation plan, restricted stock, outstanding, weighted average remaining contractual terms	1 year 6 months
West Bancorporation, Inc. 2017 Equity Incentive Plan [Member]
Stock compensation plan [Line Items]
Stock compensation plan, restricted stock, number of shares authorized	800,000
Stock compensation plan, restricted stock, number of shares available for grant	639,500

Employee Savings and Stock Ow_2

Employee Savings and Stock Ownership Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer discretionary contribution percent	4.00%	4.00%	4.00%
Expense, defined contribution plan, employer contributions	$ 1,040	$ 961	$ 1,023
Shares held in employee stock ownership plan, allocated	306,678	294,423
One Hundred Percent Matching Percentage [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent	6.00%	6.00%	6.00%

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	$ (1,892)
Other comprehensive income (loss), transfers from held-to-maturity to available-for-sale securities, net of tax	273
Other comprehensive income (loss), net of tax	(4,552)	$ (850)	$ (612)
Accumulated other comprehensive income (loss), balance end of period	(6,814)	(1,892)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	(1,892)	(1,042)	(430)
Other comprehensive income (loss), transfers from held-to-maturity to available-for-sale securities, net of tax	273
Other comprehensive income (loss), before reclassifications, net of tax	(5,072)	(738)	(847)
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	247	(112)	235
Other comprehensive income (loss), net of tax	(4,552)	(850)	(612)
Other comprehensive income (loss), reclassification of stranded tax effects	(370)
Accumulated other comprehensive income (loss), balance end of period	(6,814)	(1,892)	(1,042)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	(2,237)	(1,172)	342
Other comprehensive income (loss), transfers from held-to-maturity to available-for-sale securities, net of tax	273
Other comprehensive income (loss), before reclassifications, net of tax	(5,856)	(697)	(1,394)
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	172	(368)	(120)
Other comprehensive income (loss), net of tax	(5,411)	(1,065)	(1,514)
Other comprehensive income (loss), reclassification of stranded tax effects	(475)
Accumulated other comprehensive income (loss), balance end of period	(8,123)	(2,237)	(1,172)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	345	130	(772)
Other comprehensive income (loss), transfers from held-to-maturity to available-for-sale securities, net of tax	0
Other comprehensive income (loss), before reclassifications, net of tax	784	(41)	547
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	75	256	355
Other comprehensive income (loss), net of tax	859	215	902
Other comprehensive income (loss), reclassification of stranded tax effects	105
Accumulated other comprehensive income (loss), balance end of period	$ 1,309	$ 345	$ 130

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 234,526	$ 216,420
Capital to risk weighted assets	11.50%	11.76%
Capital required for capital adequacy	$ 163,213	$ 147,169
Capital required for capital adequacy to risk-weighted assets	8.00%	8.00%
Capital required for capital adequacy with capital conservation buffer	$ 201,466	$ 170,164
Capital required for capital adequacy with capital conservation buffer to risk-weighted assets	9.875%	9.25%
Tier one risk based capital	$ 217,837	$ 199,990
Tier one risk based capital to risk-weighted assets	10.68%	10.87%
Tier one risk based capital required for capital adequacy	$ 122,410	$ 110,377
Tier one risk based capital required for capital adequacy to risk-weighted assets	6.00%	6.00%
Tier one risk based capital required for capital adequacy with capital conservation buffer	$ 160,663	$ 133,372
Tier one risk based capital required for capital adequacy with capital conservation buffer to risk-weighted assets	7.875%	7.25%
Common equity tier one capital	$ 197,837	$ 179,990
Common equity tier one capital to risk-weighted assets	9.70%	9.78%
Common equity tier one capital required for capital adequacy	$ 91,807	$ 82,783
Common equity tier one capital required for capital adequacy to risk-weighted assets	4.50%	4.50%
Common equity tier one capital required for capital adequacy with capital conservation buffer	$ 130,060	$ 105,778
Common equity tier one capital required for capital adequacy with capital conservation buffer to risk-weighted assets	6.375%	5.75%
Tier one leverage capital	$ 217,837	$ 199,990
Tier one leverage capital to average assets	9.74%	9.60%
Tier one leverage capital required for capital adequacy	$ 89,485	$ 83,326
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required for capital adequacy with capital conservation buffer	$ 89,485	$ 83,326
Tier one leverage capital required for capital adequacy with capital conservation buffer to average assets	4.00%	4.00%
Tangible capital to tangible assets	8.32%	8.42%
Intangible assets	$ 0	$ 0
Preferred stock, shares outstanding	0	0
West Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 245,962	$ 235,570
Capital to risk weighted assets	12.07%	12.82%
Capital required for capital adequacy	$ 163,076	$ 147,049
Capital required for capital adequacy to risk-weighted assets	8.00%	8.00%
Capital required for capital adequacy with capital conservation buffer	$ 201,297	$ 170,026
Capital required for capital adequacy with capital conservation buffer to risk-weighted assets	9.875%	9.25%
Capital required to be well-capitalized	$ 203,845	$ 183,812
Capital required to be well-capitalized to risk-weighted assets	10.00%	10.00%
Tier one risk based capital	$ 229,273	$ 219,140
Tier one risk based capital to risk-weighted assets	11.25%	11.92%
Tier one risk based capital required for capital adequacy	$ 122,307	$ 110,287
Tier one risk based capital required for capital adequacy to risk-weighted assets	6.00%	6.00%
Tier one risk based capital required for capital adequacy with capital conservation buffer	$ 160,528	$ 133,263
Tier one risk based capital required for capital adequacy with capital conservation buffer to risk-weighted assets	7.875%	7.25%
Tier one risk based capital required to be well-capitalized	$ 163,076	$ 147,049
Tier one risk based capital required to be well-capitalized to risk-weighted assets	8.00%	8.00%
Common equity tier one capital	$ 229,273	$ 219,140
Common equity tier one capital to risk-weighted assets	11.25%	11.92%
Common equity tier one capital required for capital adequacy	$ 91,730	$ 82,715
Common equity tier one capital required for capital adequacy to risk-weighted assets	4.50%	4.50%
Common equity tier one capital required for capital adequacy with capital conservation buffer	$ 129,951	$ 105,692
Common equity tier one capital required for capital adequacy with capital conservation buffer to risk-weighted assets	6.375%	5.75%
Common equity tier one capital required to be well-capitalized	$ 132,499	$ 119,478
Common equity tier one capital required to be well-capitalized to risk-weighted assets	6.50%	6.50%
Tier one leverage capital	$ 229,273	$ 219,140
Tier one leverage capital to average assets	10.26%	10.52%
Tier one leverage capital required for capital adequacy	$ 89,410	$ 83,287
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required for capital adequacy with capital conservation buffer	$ 89,410	$ 83,287
Tier one leverage capital required for capital adequacy with capital conservation buffer to average assets	4.00%	4.00%
Tier one leverage capital required to be well-capitalized	$ 111,762	$ 104,109
Tier one leverage capital required to be well-capitalized to average assets	5.00%	5.00%

Commitments and Contingencies R

Commitments and Contingencies Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases, Operating [Abstract]
Operating leases, rent expense	$ 1,540	$ 1,344	$ 1,293

Commitments and Contingencies M

Commitments and Contingencies Minimum Rental Commitments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating leases, future estimated minimum payments due, 2019	$ 1,534
Operating leases, future estimated minimum payments due, 2020	1,534
Operating leases, future estimated minimum payments due, 2021	1,479
Operating leases, future estimated minimum payments due, 2022	1,448
Operating leases, future estimated minimum payments due, 2023	1,457
Operating leases, future estimated minimum payments due, thereafter	3,858
Operating leases, total future estimated minimum payments due	$ 11,310

Commitments and Contingencies_3

Commitments and Contingencies Required Reserve Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Subsidiaries [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Required cash reserve balances, Federal Reserve Bank	$ 4,527	$ 6,086

Commitments and Contingencies C

Commitments and Contingencies Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	$ 648,212	$ 623,945
Commitments to extend credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	641,581	617,949
Standby letters of credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	6,631	$ 5,996
Commitments to extend credit, expiration after one year [Member] | Commitments to extend credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	$ 90,781

Commitments and Contingencies O

Commitments and Contingencies Other Narratives (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
FHLB MPF program remaining outstanding balance of loans sold	$ 78,024	$ 94,292
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	$ 0	$ 0

Commitments and Contingencies_4

Commitments and Contingencies Contractual commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Affordable Housing Project Investment [Member]
Long-term Purchase Commitment [Line Items]
Contractual obligation	$ 4,421	$ 6,130

Fair Value Measurements Recurri

Fair Value Measurements Recurring Basis by Level (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	$ 453,758	$ 444,219
Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	453,758	444,219
Interest rate swaps, derivative asset	1,863	895
Interest rate swaps, derivative liability	0	86
Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps, derivative asset	1,863	895
Interest rate swaps, derivative liability		86
Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps, derivative asset	0	0
Interest rate swaps, derivative liability		0
Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps, derivative asset	1,863	895
Interest rate swaps, derivative liability		86
Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps, derivative asset	0	0
Interest rate swaps, derivative liability		0
State and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	149,156	146,313
State and political subdivisions [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	149,156	146,313
State and political subdivisions [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
State and political subdivisions [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	149,156	146,313
State and political subdivisions [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Collateralized mortgage obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	157,004	159,932
Collateralized mortgage obligations [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	157,004	159,932
Collateralized mortgage obligations [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Collateralized mortgage obligations [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	157,004	159,932
Collateralized mortgage obligations [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	63,378	60,429
Mortgage-backed securities [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	63,378	60,429
Mortgage-backed securities [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Mortgage-backed securities [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	63,378	60,429
Mortgage-backed securities [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Asset-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	31,903	45,195
Asset-backed securities [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	31,903	45,195
Asset-backed securities [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Asset-backed securities [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	31,903	45,195
Asset-backed securities [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Trust preferred security [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	1,900	2,006
Trust preferred security [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	1,900	2,006
Trust preferred security [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Trust preferred security [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	1,900	2,006
Trust preferred security [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Corporate notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	50,417	30,344
Corporate notes [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	50,417	30,344
Corporate notes [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	0	0
Corporate notes [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	50,417	30,344
Corporate notes [Member] | Fair value, measurements, recurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale	$ 0	$ 0

Fair Value Measurements Nonrecu

Fair Value Measurements Nonrecurring Basis by Level (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, measurements, nonrecurring [Member] | Fair value, inputs, level 3 [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 0	$ 0

Fair Value Measurements Carryin

Fair Value Measurements Carrying Amounts and Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 46,369	$ 34,952
Federal funds sold	1,105	12,997
Investment securities available for sale	453,758	444,219
Investment securities held to maturity	0	45,527
Federal Home Loan Bank stock	12,037	9,174
Loans, net	1,705,141	1,494,070
Accrued interest receivable	7,631	7,344
Deposits	1,894,529	1,810,813
Federal funds purchased	19,985	545
Federal Home Loan Bank advances, net of discount	137,878	76,382
Long-term debt	27,040	22,917
Fair value, inputs, level 1 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	46,369	34,952
Federal funds sold	1,105	12,997
Federal Home Loan Bank stock	12,037	9,174
Accrued interest receivable	7,631	7,344
Federal funds purchased	19,985	545
Accrued interest payable	1,317	736
Fair value, inputs, level 1 [Member] | Estimate of fair value, fair value disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	46,369	34,952
Federal funds sold	1,105	12,997
Federal Home Loan Bank stock	12,037	9,174
Accrued interest receivable	7,631	7,344
Federal funds purchased	19,985	545
Accrued interest payable	1,317	736
Fair value, inputs, level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	453,758	444,219
Interest rate swaps, derivative asset	1,863	895
Interest rate swaps, derivative liability	0	86
Fair value, inputs, level 2 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	453,758	444,219
Investment securities held to maturity	0	45,527
Loans, net	1,705,141	1,494,070
Interest rate swaps, derivative asset	1,863	895
Deposits	1,894,529	1,810,813
Subordinated notes, net	20,425	20,412
Federal Home Loan Bank advances, net of discount	137,878	76,382
Long-term debt	27,040	22,917
Interest rate swaps, derivative liability	0	86
Fair value, inputs, level 2 [Member] | Estimate of fair value, fair value disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities held to maturity	0	45,890
Loans, net	1,688,700	1,490,166
Deposits	1,893,621	1,810,924
Subordinated notes, net	15,498	15,357
Federal Home Loan Bank advances, net of discount	137,878	76,382
Long-term debt	27,000	22,860
Standby letters of credit [Member] | Fair value, inputs, level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Standby letters of credit	0	0
Standby letters of credit [Member] | Fair value, inputs, level 3 [Member] | Estimate of fair value, fair value disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Standby letters of credit	0	0
Commitments to extend credit [Member] | Fair value, inputs, level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Standby letters of credit	0	0
Commitments to extend credit [Member] | Fair value, inputs, level 3 [Member] | Estimate of fair value, fair value disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Standby letters of credit	$ 0	$ 0

Fair Value Measurements Narrati

Fair Value Measurements Narratives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers between levels, fair value disclosure	$ 0	$ 0

Condensed Balance Sheets - Pare

Condensed Balance Sheets - Parent Company Only (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Other assets	$ 8,269	$ 4,809
Total assets	2,296,568	2,114,377
LIABILITIES
Accrued expenses and other liabilities	5,688	5,210
Long-term debt	27,040	22,917
Total liabilities	2,105,545	1,936,279
STOCKHOLDERS’ EQUITY
Preferred stock	0	0
Common stock	3,000	3,000
Additional paid-in capital	25,128	23,463
Retained earnings	169,709	153,527
Accumulated other comprehensive income (loss)	(6,814)	(1,892)
Total stockholders’ equity	191,023	178,098	$ 165,376	$ 152,377
Total liabilities and stockholders’ equity	2,296,568	2,114,377
Parent Company [Member]
ASSETS
Cash	3,951	3,226	$ 3,945	$ 13,775
Investment in West Bank	221,559	216,693
Investment in West Bancorporation Capital Trust I	619	619
Other assets	1,232	1,034
Total assets	227,361	221,572
LIABILITIES
Accrued expenses and other liabilities	663	562
Subordinated notes, net	20,425	20,412
Long-term debt	15,250	22,500
Total liabilities	36,338	43,474
STOCKHOLDERS’ EQUITY
Preferred stock	0	0
Common stock	3,000	3,000
Additional paid-in capital	25,128	23,463
Retained earnings	169,709	153,527
Accumulated other comprehensive income (loss)	(6,814)	(1,892)
Total stockholders’ equity	191,023	178,098
Total liabilities and stockholders’ equity	$ 227,361	$ 221,572

Condensed Statements of Income-

Condensed Statements of Income- Parent Company Only (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Expenses [Abstract]
Interest on subordinated notes									$ 1,076	$ 901	$ 728
Interest on long-term debt									757	519	145
Occupancy									4,996	4,406	4,033
Income tax benefits	$ 945	$ 2,507	$ 1,600	$ 1,508	$ 5,226	$ 2,870	$ 2,872	$ 2,400	6,560	13,368	9,936
Net income	$ 7,227	$ 7,133	$ 6,764	$ 7,384	$ 4,194	$ 6,405	$ 6,365	$ 6,106	28,508	23,070	23,016
Parent Company [Member]
Operating Income
Equity in net income of West Bank									30,282	23,933	23,544
Equity in net income of West Bancorporation Capital Trust I									33	27	23
Intercompany rental income									0	333	503
Other rental income									0	21	50
Total operating income									30,315	24,314	24,120
Operating Expenses [Abstract]
Interest on subordinated notes									1,076	901	728
Interest on long-term debt									750	517	145
Occupancy									0	187	280
Other expenses									530	602	443
Total operating expenses									2,356	2,207	1,596
Income before income taxes									27,959	22,107	22,524
Income tax benefits									(549)	(963)	(492)
Net income									$ 28,508	$ 23,070	$ 23,016

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - Parent Company Only (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 7,227	$ 7,133	$ 6,764	$ 7,384	$ 4,194	$ 6,405	$ 6,365	$ 6,106	$ 28,508	$ 23,070	$ 23,016
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									1,408	1,347	1,046
Deferred income tax (benefits)									(359)	2,833	89
Change in assets and liabilities:
(Increase) decrease in other assets									(2,490)	131	(85)
Increase (decrease) in accrued expenses and other liabilities									563	(1,503)	1,047
Cash Flows from Investing Activities:
Purchases of premises									(210)	(1,055)	(12,802)
Proceeds from long-term debt									11,486	22,000	0
Cash Flows from Financing Activities:
Principal payments on long-term debt									(7,363)	(4,212)	(3,286)
Common stock cash dividends									(12,696)	(11,499)	(10,800)
Parent Company [Member]
Cash Flows from Operating Activities:
Net income									28,508	23,070	23,016
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net income of West Bank									(30,282)	(23,933)	(23,544)
Equity in net income of West Bancorporation Capital Trust I									(33)	(27)	(23)
Dividends received from West Bank									22,300	16,800	14,400
Dividends received from West Bancorporation Capital Trust I									33	27	23
Amortization									13	17	20
Depreciation									0	178	244
Deferred income tax (benefits)									0	(240)	97
Change in assets and liabilities:
(Increase) decrease in other assets									107	50	(79)
Increase (decrease) in accrued expenses and other liabilities									25	(549)	641
Net cash provided by operating activities									20,671	15,393	14,795
Cash Flows from Investing Activities:
Proceeds from sales of premises									0	18,032	0
Purchases of premises									0	(16)	(10,539)
Capital contribution to West Bank									0	(40,000)	0
Net cash provided by (used in) investing activities									0	(21,984)	(10,539)
Proceeds from long-term debt									0	22,000	0
Cash Flows from Financing Activities:
Principal payments on long-term debt									(7,250)	(4,629)	(3,286)
Common stock cash dividends									(12,696)	(11,499)	(10,800)
Net cash provided by (used in) financing activities									(19,946)	5,872	(14,086)
Net increase (decrease) in cash									725	(719)	(9,830)
Cash:
Beginning				$ 3,226				$ 3,945	3,226	3,945	13,775
Ending	$ 3,951				$ 3,226				$ 3,951	$ 3,226	$ 3,945

Selected Quarterly Financial _3

Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Interest income	$ 22,606	$ 21,920	$ 20,537	$ 19,730	$ 19,517	$ 18,560	$ 18,166	$ 16,791	$ 84,793	$ 73,034	$ 64,994
Interest expense	6,950	6,233	5,238	4,314	3,973	3,529	3,073	2,402	22,735	12,977	7,876
Net interest income	15,656	15,687	15,299	15,416	15,544	15,031	15,093	14,389	62,058	60,057	57,118
Provision for loan losses	0	(400)	0	150	0	0	0	0	(250)	0	1,000
Net interest income after provision for loan losses	15,656	16,087	15,299	15,266	15,544	15,031	15,093	14,389	62,308	60,057	56,118
Noninterest income	1,702	2,114	2,023	1,913	1,908	2,264	2,316	2,160	7,752	8,648	7,982
Noninterest expense	9,186	8,561	8,958	8,287	8,032	8,020	8,172	8,043	34,992	32,267	31,148
Income before income taxes	8,172	9,640	8,364	8,892	9,420	9,275	9,237	8,506	35,068	36,438	32,952
Income taxes	945	2,507	1,600	1,508	5,226	2,870	2,872	2,400	6,560	13,368	9,936
Net income	$ 7,227	$ 7,133	$ 6,764	$ 7,384	$ 4,194	$ 6,405	$ 6,365	$ 6,106	$ 28,508	$ 23,070	$ 23,016
Basic earnings per common share	$ 0.44	$ 0.44	$ 0.42	$ 0.46	$ 0.26	$ 0.40	$ 0.39	$ 0.38	$ 1.75	$ 1.42	$ 1.43
Diluted earnings per common share	$ 0.44	$ 0.43	$ 0.41	$ 0.45	$ 0.26	$ 0.39	$ 0.39	$ 0.37	$ 1.74	$ 1.41	$ 1.42