West Bancorporation (WTBA) 10-K 1 Mar 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 27, 2017	Jun. 30, 2016
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, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		16,137,999
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 291,567,735

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 40,943	$ 57,329
Federal funds sold	35,893	15,322
Cash and cash equivalents	76,836	72,651
Investment securities available for sale, at fair value	260,637	320,714
Investment securities held to maturity, at amortized cost (fair value of $47,789 and $51,918 at December 31, 2016 and 2015, respectively)	48,386	51,259
Federal Home Loan Bank stock, at cost	10,771	12,447
Loans	1,399,870	1,246,688
Allowance for loan losses	(16,112)	(14,967)
Loans, net	1,383,758	1,231,721
Premises and equipment, net	23,314	11,562
Accrued interest receivable	5,321	4,688
Bank-owned life insurance	33,111	32,834
Deferred tax assets, net	6,957	6,670
Other assets	5,113	3,850
Total assets	1,854,204	1,748,396
Deposits:
Noninterest-bearing demand	479,311	486,707
Interest-bearing demand	282,592	267,824
Savings	668,688	570,391
Time of $250,000 or more	10,446	14,749
Other time	105,568	101,058
Total deposits	1,546,605	1,440,729
Federal funds purchased	9,690	2,760
Short-term borrowings	0	19,000
Subordinated notes, net	20,398	20,385
Federal Home Loan Bank advances, net	99,886	98,385
Long-term debt, net	5,126	8,405
Accrued expenses and other liabilities	7,123	6,355
Total liabilities	1,688,828	1,596,019
STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value; authorized 50,000,000 shares; no shares issued and outstanding at December 31, 2016 and 2015	0	0
Common stock, no par value; authorized 50,000,000 shares; 16,137,999 and 16,064,435 shares issued and outstanding at December 31, 2016 and 2015, respectively	3,000	3,000
Additional paid-in capital	21,462	20,067
Retained earnings	141,956	129,740
Accumulated other comprehensive (loss)	(1,042)	(430)
Total stockholders' equity	165,376	152,377
Total liabilities and stockholders' equity	$ 1,854,204	$ 1,748,396

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Investment securities held to maturity, fair value	$ 47,789	$ 51,918
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	16,137,999	16,064,435
Common stock, shares outstanding	16,137,999	16,064,435

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Loans, including fees		$ 57,419	$ 52,556	$ 47,440
Investment securities:
Taxable		4,201	4,363	4,938
Tax-exempt		3,266	3,147	2,878
Federal funds sold		108	81	45
Total interest income		64,994	60,147	55,301
Interest expense:
Deposits		3,391	2,185	2,426
Federal funds purchased		5	9	11
Short-term borrowings		42	37	40
Subordinated notes		728	705	754
Federal Home Loan Bank advances		3,565	2,825	2,628
Long-term debt		145	232	297
Total interest expense		7,876	5,993	6,156
Net interest income		57,118	54,154	49,145
Provision for loan losses	[1]	1,000	850	750
Net interest income after provision for loan losses		56,118	53,304	48,395
Noninterest income:
Service charges on deposit accounts		2,461	2,609	2,790
Debit card usage fees		1,825	1,830	1,764
Trust services		1,310	1,286	1,327
Revenue from residential mortgage banking		151	163	1,394
Increase in cash value of bank-owned life insurance		647	727	731
Gain from bank-owned life insurance		443	0	0
Gain (loss) on disposition of premises and equipment		(4)	(6)	1,069
Realized investment securities gains, net		66	47	223
Other income		1,083	1,547	998
Total noninterest income		7,982	8,203	10,296
Noninterest expense:
Salaries and employee benefits		16,731	16,065	16,086
Occupancy		4,033	4,105	4,165
Data processing		2,510	2,329	2,241
FDIC insurance		937	839	757
Other real estate owned		0	10	1,865
Professional fees		774	748	944
Director fees		888	881	714
Other expenses		5,275	5,091	5,230
Total noninterest expense		31,148	30,068	32,002
Income before income taxes		32,952	31,439	26,689
Income taxes		9,936	9,697	6,649
Net income		$ 23,016	$ 21,742	$ 20,040
Basic earnings per common share		$ 1.43	$ 1.35	$ 1.25
Diluted earnings per common share		$ 1.42	$ 1.35	$ 1.25
[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.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 23,016	$ 21,742	$ 20,040
Total other comprehensive income (loss)	(612)	(684)	3,792
Comprehensive income	22,404	21,058	23,832
Unrealized Gains Losses on Derivatives [Member]
Unrealized gains (losses) on derivatives arising during the period	882	(1,144)	(3,759)
Less: reclassification adjustment for net loss on derivatives realized in net income	464	89	83
Less: reclassification adjustment for amortization of derivative termination costs, realized in interest expense	109	71	0
Income tax (expense) benefit	(553)	374	1,396
Other comprehensive income (loss) on derivatives	902	(610)	(2,280)
Noncredit-related Unrealized Gains Losses on Securities with OTTI [Member]
Unrealized holding gains arising during the period	0	0	1,828
Less: reclassification adjustment for net (gains) losses realized in net income	0	0	493
Income tax (expense) benefit	0	0	(882)
Other comprehensive income on available for sale securities, net of tax	0	0	1,439
Unrealized gains losses on securities without OTTI, net of tax [Member]
Unrealized holding gains arising during the period	(2,249)	(33)	8,201
Less: reclassification adjustment for net (gains) losses realized in net income	(66)	(47)	(716)
Less: reclassification adjustment for amortization of net unrealized gains on securities transferred from available for sale to held to maturity, realized in interest income	(128)	(39)	(13)
Income tax (expense) benefit	929	45	(2,839)
Other comprehensive income on available for sale securities, net of tax	$ (1,514)	$ (74)	$ 4,633

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	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, 2013	$ 123,625	$ 0	$ 3,000	$ 18,411	$ 105,752	$ (3,538)
Common stock, shares outstanding at Dec. 31, 2013			15,976,204
Stockholders' Equity [Roll Forward]
Net income	20,040	0	$ 0	0	20,040	0
Total other comprehensive income (loss), net of tax	3,792	0	0	0	0	3,792
Cash dividends declared, common stock	(7,842)	0	0	0	(7,842)	0
Stock-based compensation costs	633	0	0	633	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(189)	0	$ 0	(189)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			42,530
Excess tax benefits from vesting of restricted stock units	116	0	$ 0	116	0	0
Balance at Dec. 31, 2014	140,175	0	$ 3,000	18,971	117,950	254
Common stock, shares outstanding at Dec. 31, 2014			16,018,734
Stockholders' Equity [Roll Forward]
Net income	21,742	0	$ 0	0	21,742	0
Total other comprehensive income (loss), net of tax	(684)	0	0	0	0	(684)
Cash dividends declared, common stock	(9,952)	0	0	0	(9,952)	0
Stock-based compensation costs	1,166	0	0	1,166	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(225)	0	$ 0	(225)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			45,701
Excess tax benefits from vesting of restricted stock units	155	0	$ 0	155	0	0
Balance at Dec. 31, 2015	$ 152,377	0	$ 3,000	20,067	129,740	(430)
Common stock, shares outstanding at Dec. 31, 2015	16,064,435		16,064,435
Stockholders' Equity [Roll Forward]
Net income	$ 23,016	0	$ 0	0	23,016	0
Total other comprehensive income (loss), net of tax	(612)	0	0	0	0	(612)
Cash dividends declared, common stock	(10,800)	0	0	0	(10,800)	0
Stock-based compensation costs	1,684	0	0	1,684	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(394)	0	$ 0	(394)	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	0	$ 0	105	0	0
Balance at Dec. 31, 2016	$ 165,376	$ 0	$ 3,000	$ 21,462	$ 141,956	$ (1,042)
Common stock, shares outstanding at Dec. 31, 2016	16,137,999		16,137,999

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share	$ 0.67	$ 0.62	$ 0.49

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income		$ 23,016	$ 21,742	$ 20,040
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	[1]	1,000	850	750
Net amortization and accretion		4,290	3,892	3,767
(Gain) loss on disposition of premises and equipment		4	6	(1,069)
Investment securities gains, net		66	47	223
Stock-based compensation		1,684	1,166	633
Gain on sale of loans held for sale		0	(14)	(1,247)
Proceeds from sales of loans held for sale		0	840	63,314
Originations of loans held for sale		0	0	(60,663)
Write-down of other real estate owned		0	0	1,786
Increase in cash value of bank-owned life insurance		(647)	(727)	(731)
Gain from bank-owned life insurance		(443)	0	0
Depreciation		1,046	921	853
Deferred income taxes		89	82	535
Excess tax benefits from vesting of restricted stock units		(105)	(155)	(116)
Change in assets and liabilities:
(Increase) in accrued interest receivable		(633)	(263)	(418)
(Increase) decrease in other assets		(89)	2,945	(448)
Increase (decrease) in accrued expenses and other liabilities		1,047	(196)	(476)
Net cash provided by operating activities		30,193	31,042	26,287
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale		3,054	16,946	36,582
Proceeds from maturities and calls of investment securities		58,358	49,665	56,450
Purchases of securities available for sale		(3,500)	(116,824)	(67,770)
Purchases of Federal Home Loan Bank stock		(17,407)	(19,986)	(29,064)
Proceeds from redemption of Federal Home Loan Bank stock		19,083	22,614	25,840
Net increase in loans		(153,037)	(62,133)	(193,585)
Proceeds from sales of other real estate owned		0	2,227	2,103
Proceeds from sales of premises and equipment		0	0	3,013
Purchases of premises and equipment		(12,802)	(2,502)	(5,298)
Purchase of bank-owned life insurance		0	0	(5,000)
Proceeds of principal and earnings from bank-owned life insurance		812	0	0
Proceeds from settlement of other assets		0	3,593	0
Net cash used in investing activities		(105,439)	(106,400)	(176,729)
Cash Flows from Financing Activities:
Net increase in deposits		105,876	170,267	106,620
Net increase (decrease) in federal funds purchased		6,930	(215)	(13,647)
Net increase (decrease) in short-term borrowings		(19,000)	(47,000)	66,000
Principal payments on long-term debt		(3,286)	(4,261)	(3,260)
Interest rate swap termination costs paid		0	(541)	0
Common stock dividends paid		(10,800)	(9,952)	(7,842)
Restricted stock units withheld for payroll taxes		(394)	(225)	(189)
Excess tax benefits from vesting of restricted stock units		105	155	116
Net cash provided by financing activities		79,431	108,228	147,798
Net increase (decrease) in cash and cash equivalents		4,185	32,870	(2,644)
Cash and Cash Equivalents:
Beginning		72,651	39,781	42,425
Supplemental Disclosure of Cash Flow Information:
Interest		7,940	6,069	6,166
Income taxes		7,870	6,700	7,045
Supplemental Disclosure of Noncash Investing and Financing Activities:
Transfer of loans to other real estate owned		0	0	394
Transfer of investment securities available for sale to investment securities held to maturity		0	0	50,882
Transfer of investment securities to other assets, sale not settled		$ 0	$ 0	$ 3,593
[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.

Organization and Nature of Busi

Organization and Nature of Business and Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Dec. 31, 2016
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 Iowa City, Iowa, 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 , sometimes referred to as the Codification or ASC. In preparing the 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 and other than temporary impairment (OTTI) of financial instruments and the allowance for loan losses. Consolidation policy : The consolidated financial statements include the accounts of the Company, West Bank, West Bank's wholly-owned subsidiary WB Funding Corporation (which owned an interest in a limited liability company that was sold in the fourth quarter of 2015), and West Bank's 99.99 percent owned subsidiary ICD IV, LLC (a community development partnership that was liquidated during the third quarter of 2014 because the underlying loan matured). 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. Reclassification: Certain amounts in prior year financial statements have been reclassified, with no effect on net income, comprehensive income or stockholder's equity, to conform with current period presentation. 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. The Company has determined that its business is comprised of one operating segment, which is banking. The banking segment generates revenue through interest and fees on loans, service charges on deposit accounts, interest on investment securities, fees for trust services and other miscellaneous banking related activities. This segment includes the Company, West Bank, and related elimination entries between the two, as the Company's operation is similar to that of West Bank. 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 OTTI securities 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 and deposits 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 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. 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 those outstanding loan balances. 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 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 past due 90 days 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 West Bank'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 least annually. 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. 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, 2016 and 2015 , 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 $ 251,767 as of December 31, 2016 , compared to assets totaling $209,920 as of December 31, 2015 . 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 accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the resulting designation. As of December 31, 2016 , the Company had cash flow hedging relationships, which were derivatives to hedge the exposure to variability in expected future cash flows. To qualify for hedge accounting, the Company must comply with the detailed rules and documentation requirements at the inception of the hedge, and hedge effectiveness is assessed at inception and on a quarterly basis throughout the life of each hedging relationship. Hedge ineffectiveness, if any, is measured periodically throughout the life of the hedging relationship. The Company does not use derivatives for trading or speculative purposes. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is initially reported in OCI, net of deferred taxes, and subsequently reclassified to interest income or expense when the hedged transaction affects earnings, while the ineffective portion of changes in the fair value of the derivative, if any, is recognized immediately in other noninterest income. The Company assesses the effectiveness of the hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instrument with the cumulative changes in cash flows of the designated hedged item or transaction. Stock-based compensation: The West Bancorporation, Inc. 2012 Equity Incentive Plan (the 2012 Plan) was approved by the stockholders in 2012 as a means to attract, retain and reward selected participants. The 2012 Plan is 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 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. The Company currently assumes no projected forfeitures on its stock-based compensation, since all RSUs are expected to vest and no forfeitures have occurred as of December 31, 2016 . Deferred compensation: The West Bancorporation, Inc. Deferred Compensation Plan (the Deferred Compensation Plan) was adopted effective January 1, 2013, to provide 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, 2016 , 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 loss, operating loss, and tax credit carryforwards, 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. 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 related to income taxes are recorded as other noninterest expense in the consolidated income statements. 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 was 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. The incremental shares, to the extent they would have been dilutive, were included in the denominator of the diluted earnings per common share calculation. Current accounting developments : In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606): Summary and Amendments that Create Revenue from Contracts with Customers (Topic 606) and Other Assets and Deferred Costs—Contracts with Customers (Subtopic 340-40) . 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. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2017. The Company has assessed the impact of this guidance and does not expect the guidance to have a material impact on the Company's consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The update simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. For public companies, this update was effective for interim and annual periods beginning after December 15, 2015, and was applied retrospectively. The adoption of this guidance required a balance sheet reclassification of unamortized debt issuance costs, which did not have a material impact on the Company's consolidated financial statements. 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 will be effective for interim and annual periods beginning after December 15, 2017, and is to be applied on a modified retrospective basis. The Company is currently assessing the impact of this guidance, but does not expect the guidance to 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 update will require business entities to recognize lease assets and liabilities on the balance sheet and to disclose key information about leasing arrangements. A lessee would recognize a liability to make lease payments and a right-of-use asset representing its right to use the leased asset for the lease term. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2018, and is to be applied on a modified retrospective basis. The Company is currently assessing the impact of this guidance, but does not expect the guidance to have a material impact on the Company's consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718). The update simplifies several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The guidance also allows an entity to make an entity-wide accounting policy election to either estimate expected forfeitures or account for forfeitures as they occur. For public companies, the update is effective for annual periods beginning after December 15, 2016. Portions of the amended guidance are to be applied using a modified retrospective transition method, and others require prospective application. The adoption of this guidance will not have a material impact on the Company's consolidated financial statements. 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. The income statement reflects 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 is currently planning for the implementation of this accounting standard. It is too early to assess the impact that this guidance will have on the Company's consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The amendments in this update provide guidance for eight specific cash flow classification issues for which current guidance is unclear or does not exist, thereby reducing diversity in practice. For public companies, the update is effective for annual periods beginning after December 15, 2017. The Company is currently assessing the impact of this guidance, but does not expect the guidance to have a material impact on the Company's consolidated financial statements. In October 2016, the FASB issued ASU 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory. This update simplifies the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. The new guidance states that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, the amendments in this update eliminate the exception for an intra-entity transfer of an asset other than inventory. For public companies, the update is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods. Early adoption is permitted. The Company is currently assessing the impact of this guidance, but does not expect the guidance to have a material impact on the Company's consolidated financial statements.

Earnings per Common Share (Note

Earnings per Common Share (Notes)	12 Months Ended
	Dec. 31, 2016
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 for the years ended December 31, 2016 , 2015 and 2014 , is presented below. (dollars and number of shares in thousands, except per share data) 2016 2015 2014 Net income $ 23,016 $ 21,742 $ 20,040 Weighted average common shares outstanding 16,117 16,050 16,004 Weighted average effect of restricted stock units outstanding 54 46 38 Diluted weighted average common shares outstanding 16,171 16,096 16,042 Basic earnings per common share $ 1.43 $ 1.35 $ 1.25 Diluted earnings per common share $ 1.42 $ 1.35 $ 1.25 Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation 102 140 —

Investment securities (Notes)

Investment securities (Notes)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Securities available for sale: U.S. government agencies and corporations $ 2,524 $ 69 $ — $ 2,593 State and political subdivisions 64,551 376 (591 ) 64,336 Collateralized mortgage obligations (1) 103,038 255 (1,343 ) 101,950 Mortgage-backed securities (1) 80,614 341 (797 ) 80,158 Trust preferred security 1,784 — (534 ) 1,250 Corporate notes 10,326 25 (1 ) 10,350 $ 262,837 $ 1,066 $ (3,266 ) $ 260,637 Securities held to maturity: State and political subdivisions $ 48,386 $ 70 $ (667 ) $ 47,789 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Securities available for sale: U.S. government agencies and corporations $ 2,551 $ 141 $ — $ 2,692 State and political subdivisions 71,431 1,669 (21 ) 73,079 Collateralized mortgage obligations (1) 133,414 491 (1,290 ) 132,615 Mortgage-backed securities (1) 101,299 485 (696 ) 101,088 Trust preferred security 1,773 — (668 ) 1,105 Corporate notes and equity securities 10,130 61 (56 ) 10,135 $ 320,598 $ 2,847 $ (2,731 ) $ 320,714 Securities held to maturity: State and political subdivisions $ 51,259 $ 883 $ (224 ) $ 51,918 (1) All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities guaranteed by GNMA or issued by FNMA and real estate mortgage investment conduits guaranteed by FHLMC or GNMA. Investment securities with an amortized cost of approximately $141,995 and $78,553 as of December 31, 2016 and 2015 , 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 increase in the amount of pledged investment securities as of December 31, 2016 compared to December 31, 2015 was primarily due to an increase in public fund deposits. The amortized cost and fair value of investment securities available for sale as of December 31, 2016 , 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 and mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, collateralized mortgage obligations and mortgage-backed securities are not included in the maturity categories in the following maturity summary. 2016 Amortized Cost Fair Value Due in one year or less $ 6,027 $ 6,101 Due after one year through five years 11,725 11,809 Due after five years through ten years 38,274 37,996 Due after ten years 23,159 22,623 79,185 78,529 Collateralized mortgage obligations and mortgage-backed securities 183,652 182,108 $ 262,837 $ 260,637 The amortized cost and fair value of investment securities held to maturity as of December 31, 2016 , by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity. 2016 Amortized Cost Fair Value Due after one year through five years $ 486 $ 474 Due after five years through ten years 19,370 19,110 Due after ten years 28,530 28,205 $ 48,386 $ 47,789 The details of the sales of investment securities for the years ended December 31, 2016 , 2015 and 2014 are summarized in the following table. 2016 2015 2014 Proceeds from sales $ 3,054 $ 16,946 $ 36,582 Gross gains on sales 66 54 1,050 Gross losses on sales — 7 827 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, 2016 and 2015 . 2016 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: U.S. government agencies and corporations $ — $ — $ — $ — $ — $ — State and political subdivisions 34,903 (591 ) — — 34,903 (591 ) Collateralized mortgage obligations 75,771 (1,255 ) 2,538 (88 ) 78,309 (1,343 ) Mortgage-backed securities 60,221 (797 ) — — 60,221 (797 ) Trust preferred security — — 1,250 (534 ) 1,250 (534 ) Corporate notes 1,499 (1 ) — — 1,499 (1 ) $ 172,394 $ (2,644 ) $ 3,788 $ (622 ) $ 176,182 $ (3,266 ) Securities held to maturity: State and political subdivisions $ 32,976 $ (458 ) $ 3,968 $ (209 ) $ 36,944 $ (667 ) 2015 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: U.S. government agencies and corporations $ — $ — $ — $ — $ — $ — State and political subdivisions 321 (1 ) 2,053 (20 ) 2,374 (21 ) Collateralized mortgage obligations 53,043 (449 ) 38,286 (841 ) 91,329 (1,290 ) Mortgage-backed securities 67,662 (600 ) 7,200 (96 ) 74,862 (696 ) Trust preferred security — — 1,105 (668 ) 1,105 (668 ) Corporate notes and equity securities 4,500 (56 ) — — 4,500 (56 ) $ 125,526 $ (1,106 ) $ 48,644 $ (1,625 ) $ 174,170 $ (2,731 ) Securities held to maturity: State and political subdivisions $ 2,832 $ (42 ) $ 7,341 $ (182 ) $ 10,173 $ (224 ) As of December 31, 2016 , the available for sale and held to maturity investment securities with unrealized losses that have existed for longer than one year included 11 state and political subdivision securities, one collateralized mortgage obligation and one trust preferred security. The Company believes the unrealized losses on investment securities available for sale and held to maturity as of December 31, 2016 , were due to market conditions, 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, 2016 .

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses (Notes)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . 2016 2015 Commercial $ 334,014 $ 349,051 Real estate: Construction, land and land development 205,610 174,602 1-4 family residential first mortgages 47,184 51,370 Home equity 18,057 21,749 Commercial 788,000 644,176 Consumer and other loans 8,355 6,801 1,401,220 1,247,749 Net unamortized fees and costs (1,350 ) (1,061 ) $ 1,399,870 $ 1,246,688 The loan portfolio included $911,067 and $744,450 of fixed rate loans and $490,153 and $503,299 of variable rate loans as of December 31, 2016 and 2015 , respectively. Real estate loans of approximately $680,000 and $590,000 were pledged as security for FHLB advances as of December 31, 2016 and 2015 , 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, 2016 and 2015 . 2016 2015 Balance, beginning of year $ 138,706 $ 129,780 New loans 60,712 37,049 Repayments (7,721 ) (28,123 ) Balance, end of year $ 191,697 $ 138,706 The following table presents the TDR loans by segment as of December 31, 2016 and 2015 . 2016 2015 Troubled debt restructured loans (1) : Commercial $ 91 $ 102 Real estate: Construction, land and land development — 60 1-4 family residential first mortgages — 86 Home equity — — Commercial 335 445 Consumer and other loans — — Total troubled debt restructured loans $ 426 $ 693 (1) There were two TDR loans as of December 31, 2016 and three TDR loans as of December 31, 2015 , with balances of $426 and $613 , respectively, included in the nonaccrual category. There were no loan modifications considered to be TDR that occurred during the year ended December 31, 2016 , three loan modifications considered to be TDR that occurred during the year ended December 31, 2015 , and no loan modifications considered to be TDR that occurred during the year ended December 31, 2014 . The pre- and post-modification recorded investment in TDR loans that have occurred during the years ended December 31, 2016 , 2015 and 2014 , totaled $0 , $149 and $0 , respectively. The financial impact of charge-offs or specific reserves for these modified loans was immaterial. The recorded investment in TDR loans that have been modified within the twelve months ended December 31, 2016 , 2015 and 2014 , which have subsequently had a payment default, totaled $0 , $110 and $0 , respectively. A TDR loan is considered to have a payment default when it is past due 30 days or more. 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, 2016 and 2015 . December 31, 2016 December 31, 2015 Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: Commercial $ 35 $ 35 $ — $ — $ — $ — Real estate: Construction, land and land development — — — 60 663 — 1-4 family residential first mortgages 108 108 — 352 360 — Home equity 41 41 — — — — Commercial 335 335 — 482 482 — Consumer and other — — — — — — 519 519 — 894 1,505 — With an allowance recorded: Commercial 91 91 91 142 142 142 Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages — — — — — — Home equity 276 276 276 270 270 270 Commercial 136 136 136 155 155 155 Consumer and other — — — — — — 503 503 503 567 567 567 Total: Commercial 126 126 91 142 142 142 Real estate: Construction, land and land development — — — 60 663 — 1-4 family residential first mortgages 108 108 — 352 360 — Home equity 317 317 276 270 270 270 Commercial 471 471 136 637 637 155 Consumer and other — — — — — — Total impaired loans $ 1,022 $ 1,022 $ 503 $ 1,461 $ 2,072 $ 567 The balance of impaired loans at December 31, 2016 was composed of loans to 10 different borrowers, and the balance of impaired loans at December 31, 2015 was composed of loans to 13 different borrowers. As of December 31, 2016 , $946 of total impaired loans to 7 of the borrowers were also considered impaired as of December 31, 2015 . 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, 2016 , 2015 and 2014 . December 31, 2016 December 31, 2015 December 31, 2014 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial $ 3 $ — $ 116 $ — $ 271 $ — Real estate: Construction, land and land development 8 — 259 10 397 15 1-4 family residential first mortgages 212 1 311 1 355 7 Home equity 3 — — — 7 — Commercial 393 — 952 — 674 6 Consumer and other — — 2 — — — 619 1 1,640 11 1,704 28 With an allowance recorded: Commercial 127 — 204 2 544 11 Real estate: Construction, land and land development — — 190 6 1,423 66 1-4 family residential first mortgages — — — — 144 — Home equity 263 — 237 — 125 — Commercial 145 — 164 — 54 — Consumer and other — — — — — — 535 — 795 8 2,290 77 Total: Commercial 130 — 320 2 815 11 Real estate: Construction, land and land development 8 — 449 16 1,820 81 1-4 family residential first mortgages 212 1 311 1 499 7 Home equity 266 — 237 — 132 — Commercial 538 — 1,116 — 728 6 Consumer and other — — 2 — — — Total impaired loans $ 1,154 $ 1 $ 2,435 $ 19 $ 3,994 $ 105 Interest income forgone on impaired loans was $72 , $128 and $136 , respectively, during the years ended December 31, 2016 , 2015 and 2014 . The following tables provide an analysis of the payment status of the recorded investment in loans as of December 31, 2016 and 2015 . December 31, 2016 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 $ 109 $ — $ — $ 109 $ 333,779 $ 126 $ 334,014 Real estate: Construction, land and land development — — — — 205,610 — 205,610 1-4 family residential first mortgages 64 — — 64 47,012 108 47,184 Home equity — — — — 17,740 317 18,057 Commercial — — — — 787,529 471 788,000 Consumer and other — — — — 8,355 — 8,355 Total $ 173 $ — $ — $ 173 $ 1,400,025 $ 1,022 $ 1,401,220 December 31, 2015 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 $ 1 $ 38 $ — $ 39 $ 348,870 $ 142 $ 349,051 Real estate: Construction, land and land development — — — — 174,602 — 174,602 1-4 family residential first mortgages 317 — — 317 50,721 332 51,370 Home equity — — — — 21,479 270 21,749 Commercial — — — — 643,539 637 644,176 Consumer and other — — — — 6,801 — 6,801 Total $ 318 $ 38 $ — $ 356 $ 1,246,012 $ 1,381 $ 1,247,749 The following tables show the recorded investment in loans by credit quality indicator and loan segment as of December 31, 2016 and 2015 . December 31, 2016 Pass Watch Substandard Doubtful Total Commercial $ 329,366 $ 3,303 $ 1,345 $ — $ 334,014 Real estate: Construction, land and land development 204,572 — 1,038 — 205,610 1-4 family residential first mortgages 46,278 798 108 — 47,184 Home equity 17,646 — 411 — 18,057 Commercial 769,010 18,392 598 — 788,000 Consumer and other 8,355 — — — 8,355 Total $ 1,375,227 $ 22,493 $ 3,500 $ — $ 1,401,220 December 31, 2015 Pass Watch Substandard Doubtful Total Commercial $ 344,650 $ 2,936 $ 1,465 $ — $ 349,051 Real estate: Construction, land and land development 173,373 — 1,229 — 174,602 1-4 family residential first mortgages 50,375 517 478 — 51,370 Home equity 21,401 68 280 — 21,749 Commercial 619,608 22,977 1,591 — 644,176 Consumer and other 6,786 — 15 — 6,801 Total $ 1,216,193 $ 26,498 $ 5,058 $ — $ 1,247,749 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 criticized loans. 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 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 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, 2016 , 2015 and 2014 . 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 2015 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 4,415 $ 2,151 $ 466 $ 534 $ 6,013 $ 28 $ 13,607 Charge-offs (408 ) — (23 ) (2 ) — (6 ) (439 ) Recoveries 579 250 7 87 12 14 949 Provision (1) (217 ) (63 ) 58 (138 ) 1,229 (19 ) 850 Ending balance $ 4,369 $ 2,338 $ 508 $ 481 $ 7,254 $ 17 $ 14,967 2014 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 4,199 $ 3,032 $ 613 $ 403 $ 5,485 $ 59 $ 13,791 Charge-offs (836 ) — (131 ) (138 ) (112 ) — (1,217 ) Recoveries 116 8 45 99 11 4 283 Provision (1) 936 (889 ) (61 ) 170 629 (35 ) 750 Ending balance $ 4,415 $ 2,151 $ 466 $ 534 $ 6,013 $ 28 $ 13,607 (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, 2016 and 2015 . December 31, 2016 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 91 $ — $ — $ 276 $ 136 $ — $ 503 Collectively evaluated for impairment 3,790 2,639 317 202 8,561 100 15,609 Total $ 3,881 $ 2,639 $ 317 $ 478 $ 8,697 $ 100 $ 16,112 December 31, 2015 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 142 $ — $ — $ 270 $ 155 $ — $ 567 Collectively evaluated for impairment 4,227 2,338 508 211 7,099 17 14,400 Total $ 4,369 $ 2,338 $ 508 $ 481 $ 7,254 $ 17 $ 14,967 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, 2016 and 2015 . December 31, 2016 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 126 $ — $ 108 $ 317 $ 471 $ — $ 1,022 Collectively evaluated for impairment 333,888 205,610 47,076 17,740 787,529 8,355 1,400,198 Total $ 334,014 $ 205,610 $ 47,184 $ 18,057 $ 788,000 $ 8,355 $ 1,401,220 December 31, 2015 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 142 $ 60 $ 352 $ 270 $ 637 $ — $ 1,461 Collectively evaluated for impairment 348,909 174,542 51,018 21,479 643,539 6,801 1,246,288 Total $ 349,051 $ 174,602 $ 51,370 $ 21,749 $ 644,176 $ 6,801 $ 1,247,749

Premises and Equipment, Net (No

Premises and Equipment, Net (Notes)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . 2016 2015 Land $ 4,323 $ 2,823 Buildings 14,344 5,305 Leasehold improvements 3,843 3,661 Furniture and equipment 7,637 5,793 30,147 17,582 Accumulated depreciation 6,833 6,020 $ 23,314 $ 11,562

Deposits (Notes)

Deposits (Notes)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposit Liabilities Disclosures [Text Block]	Deposits The scheduled maturities of time deposits were as follows as of December 31, 2016 . 2017 $ 67,142 2018 30,911 2019 11,425 2020 3,617 2021 2,919 $ 116,014 Time deposits as of December 31, 2016 and 2015 , included $53,821 and $43,161 , 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, 2016 and 2015 , were $83,089 and $73,639 , respectively, of Insured Cash Sweep (ICS) interest-bearing checking and $155,957 and $87,556 , 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, 2016
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, 2016 , the interest rate was 4.05 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, 2016 , including amortization of issuance costs, was 4.11 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 $221 and $234 as of December 31, 2016 and 2015, respectively. The Company also has a forward-starting interest rate swap contract that effectively converts $20,000 of the variable rate junior subordinated debentures to a fixed rate beginning in September 30, 2018. See Note 10 for additional information on the interest rate swap.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances (Notes)	12 Months Ended
	Dec. 31, 2016
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances, Disclosure [Text Block]	Federal Home Loan Bank Advances and Short-term Borrowings The following table presents the terms of all FHLB long-term advances as of December 31, 2016 and 2015 . December 31, 2016 December 31, 2015 Maturity Interest Effective Interest Effective Date Variable/Fixed Rate Rate (1) Balance Rate Rate (1) Balance 1/29/2018 Fixed (2) 2.70% 2.70% $ 25,000 2.70 % 2.70 % $ 25,000 12/23/2019 Variable 1.28% 3.26% 25,000 0.86 % 2.83 % 25,000 6/22/2020 Variable 1.30% 3.45% 25,000 0.88 % 3.02 % 25,000 9/21/2020 Variable 1.30% 4.44% 30,000 0.88 % 4.44 % 30,000 105,000 105,000 Discount for modification (5,114 ) (6,615 ) Total FHLB advances, net of discount $ 99,886 $ 98,385 (1) The effective interest rate for the variable rate advances includes the effects of the discount fee amortization and interest rate swaps. (2) Callable quarterly. Three of the 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, 2016 , 2015 and 2014 , the Company amortized $1,501 , $1,497 and $1,496 , 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 advance. See Note 10 for additional information on the interest rate swap. Short-term borrowings consist of FHLB overnight advances. The balances outstanding as of December 31, 2016 and 2015 were $0 and $19,000 , respectively. 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 $300,000 at the FHLB as of December 31, 2016 . As of December 31, 2016 , West Bank had arrangements 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, 2016 , there were no amounts outstanding under these arrangements.

Long-term debt (Notes)

Long-term debt (Notes)	12 Months Ended
	Dec. 31, 2016
Debt Instruments [Abstract]
Long-term Debt [Text Block]	Long-Term Debt On June 27, 2013, the Company borrowed $16,000 from a commercial bank in the form of a five-year amortizing secured term loan with a variable rate of 1.95 percent plus 30-day LIBOR , which totaled 2.58 percent as of December 31, 2016 . The proceeds were used to finance the repurchase and cancellation of common stock. In the event that the Company defaults under the note, the interest rate would increase by an additional 5.00 percent . The outstanding balance on the note was $4,600 and $7,800 as of December 31, 2016 and 2015 , respectively. The note is secured by a pledge of certain Company assets, including the stock of West Bank. In June 2013, a portion of the property purchased for the branch office in Coralville, Iowa, was financed with a $765 eight-and-one-half-year variable payment contract with a fixed interest rate of 1.25 percent . The outstanding balance on the contract as of December 31, 2016 and 2015 was $529 and $615 , respectively. Future required principal payments for long-term debt as of December 31, 2016 are shown in the table below. 2017 $ 3,312 2018 1,514 2019 115 2020 116 2021 37 Thereafter 35 5,129 Unamortized debt issuance costs (3 ) Long-term debt, net $ 5,126

Derivatives (Notes)

Derivatives (Notes)	12 Months Ended
	Dec. 31, 2016
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 FHLB advances and junior subordinated notes, 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. In 2012 and 2013, the Company entered into four forward-starting interest rate swap transactions to effectively convert variable rate FHLB advances and junior subordinated notes to fixed rate debt as of the forward-starting dates. 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. Three of these interest rate swaps, with a total notional amount of $70,000 , have been terminated, subject to termination fees totaling $541 . The termination fees will be reclassified from accumulated other comprehensive income to interest expense over the remaining life of the underlying cash flows, through June 2020. The fourth interest rate swap, with a notional amount of $30,000 , became effective in December 2015. In October 2016, the Company entered into a forward-starting interest rate swap transaction with a notional amount of $20,000 to effectively convert its variable rate junior subordinated notes to fixed rate debt as of the forward starting date. The forward starting date of this swap is September 30, 2018. The swap transaction was designated as a cash flow hedge 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. 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 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 18 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. No amount of ineffectiveness was included in net income for the years ended December 31, 2016 , 2015 and 2014 , and the Company estimates there will be approximately $473 of cash payments and reclassification from AOCI to interest expense through December 31, 2017 . The Company will continue to assess the effectiveness of the remaining 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 contains 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 $470 and $740 of cash as collateral to the counterparty as of December 31, 2016 and 2015 , respectively. The Company's counterparty was required to pledge $1,070 and $0 at December 31, 2016 and 2015 , 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, 2016 and 2015 . Notional Amount Fair Value Balance Sheet Category Weighted Average Receive Rate Weighted Average Pay Rate Maturity December 31, 2016 Interest rate swap $ 30,000 $ (496 ) Other Liabilities 1.30 % 2.52 % 9/21/2020 Interest rate swap (1) 20,000 1,068 Other Assets — % 4.81 % 9/30/2026 December 31, 2015 Interest rate swap $ 30,000 $ (774 ) Other Liabilities 0.88 % 2.52 % 9/21/2020 (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 are required related to this swap until December 30, 2018. The following table identifies the pretax gains (losses) recognized on the Company's derivative instruments designated as cash flow hedges for the years ended December 31, 2016 , 2015 and 2014 . Effective Portion Ineffective Portion Amount of Reclassified from AOCI into Income Recognized in Income on Derivatives Pretax Gain (Loss) Recognized in Amount of Amount of Interest Rate Swaps OCI Category Gain (Loss) Category Gain (Loss) 2016 $ 882 Interest Expense $ (573 ) Other Income $ — 2015 $ (1,144 ) Interest Expense $ (160 ) Other Income $ — 2014 $ (3,759 ) Interest Expense $ (83 ) Other Income $ —

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2016
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 2013 through 2016 remain open to examination by federal and state taxing authorities. During the years ended December 31, 2016 , 2015 and 2014 , the Company recognized no material income tax related interest or penalties. No accrued interest or penalties are included in accrued tax expense in the balance sheets as of December 31, 2016 and 2015 . The following table shows the components of income taxes for the years ended December 31, 2016 , 2015 and 2014 . 2016 2015 2014 Current: Federal $ 8,220 $ 8,057 $ 4,838 State 1,627 1,558 1,276 Deferred: Federal 115 112 608 State (26 ) (30 ) (73 ) Income taxes $ 9,936 $ 9,697 $ 6,649 Total income taxes for the years ended December 31, 2016 , 2015 and 2014 , differed from the amounts computed by applying the U.S. federal income tax rate of 35 percent to income before income taxes as shown in the following table. 2016 2015 2014 Amount Percent of Pretax Income Amount Percent of Pretax Income Amount Percent of Pretax Income Computed expected tax expense $ 11,533 35.0 % $ 11,004 35.0 % $ 9,341 35.0 % State income tax expense, net of federal income tax benefit 1,004 3.0 957 3.0 596 2.2 Tax-exempt interest income (1,823 ) (5.5 ) (1,786 ) (5.7 ) (1,525 ) (5.7 ) Nondeductible interest expense to own tax-exempt securities 58 0.2 43 0.1 42 0.2 Tax-exempt increase in cash value of life insurance and gains (381 ) (1.2 ) (254 ) (0.8 ) (256 ) (1.0 ) Utilization of capital loss carryforwards — — (130 ) (0.4 ) (1,318 ) (4.9 ) Federal income tax credits (405 ) (1.2 ) (275 ) (0.9 ) (160 ) (0.6 ) Other, net (50 ) (0.1 ) 138 0.5 (71 ) (0.3 ) Income taxes $ 9,936 30.2 % $ 9,697 30.8 % $ 6,649 24.9 % Net deferred tax assets consisted of the following components as of December 31, 2016 and 2015 . 2016 2015 Deferred tax assets: Allowance for loan losses $ 6,123 $ 5,687 Net unrealized losses on securities available for sale 719 — Net unrealized losses on interest rate swap — 473 Intangibles 462 771 Accrued expenses 706 898 Restricted stock unit compensation 446 358 State net operating loss carryforward 1,271 1,183 Capital loss carryforward — 355 Other 190 34 9,917 9,759 Deferred tax liabilities: Net deferred loan fees and costs 321 350 Net unrealized gains on securities available for sale — 210 Net unrealized gains on interest rate swap 80 — Premises and equipment 1,027 674 Other 261 317 1,689 1,551 Net deferred tax assets before valuation allowance 8,228 8,208 Valuation allowance for deferred tax assets (1,271 ) (1,538 ) Net deferred tax assets $ 6,957 $ 6,670 As of December 31, 2016 , West Bancorporation, Inc. had approximately $21,185 of state net operating loss carryforwards available to offset future state taxable income. The Company has recorded a valuation allowance against the tax effect of the state net operating loss carryforwards, as management believes it is more likely than not that such carryforwards will expire without being utilized. The state net operating loss carryforwards expire in 2019 and thereafter. The valuation allowance for deferred tax assets declined by $267 from December 31, 2015 to December 31, 2016 . Of this change, a reduction of $355 related to the expiration of federal and state capital loss carryforwards, and an addition of $88 related to state net operating loss carryforwards generated in 2016 .

Stock Compensation Plans (Notes

Stock Compensation Plans (Notes)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Stock Compensation Plans The 2012 Plan is administered by the Compensation Committee of the Board of Directors, which determines the specific individuals who will be granted awards under the 2012 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 2012 Plan, except that nonemployees may not be granted incentive stock options. Under the terms of the 2012 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, 2016 and 2015 , 318,023 and 437,022 shares, respectively, of the Company's common stock remained available for future awards under the 2012 Plan. Under the 2012 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, 2016 under the 2012 Plan 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 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 2012 Plan. The following table includes a summary of nonvested RSU activity for the years ended December 31, 2016 , 2015 and 2014 . 2016 2015 2014 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 261,833 $ 16.67 179,699 $ 13.39 130,337 $ 10.50 Granted 141,000 18.44 139,500 19.59 104,750 15.30 Vested (95,565 ) 16.74 (57,366 ) 13.23 (55,388 ) 10.20 Forfeited — — — — — — Nonvested shares, ending balance 307,268 $ 17.46 261,833 $ 16.67 179,699 $ 13.39 The fair value of RSU awards that vested during 2016 , 2015 and 2014 was $1,730 , $1,118 and $818 , respectively. Total compensation costs recorded for the RSUs were $1,684 , $1,166 , and $633 for the years ended December 31, 2016 , 2015 and 2014 , respectively. As of December 31, 2016 , there was $3,656 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 3.0 years.

Employee Savings and Stock Owne

Employee Savings and Stock Ownership Plan (Notes)	12 Months Ended
	Dec. 31, 2016
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 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 for the years ended December 31, 2016 , 2015 and 2014 . Total matching and discretionary contribution expense for the years ended December 31, 2016 , 2015 and 2014 , totaled $1,023 , $960 and $964 , respectively. As of December 31, 2016 and 2015 , the plan held 327,307 and 328,206 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

Common Stock Repurchase (Notes)

Common Stock Repurchase (Notes)	12 Months Ended
	Dec. 31, 2016
Common Stock Repurchase [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Common Stock Repurchase Plan Prior to April 22, 2016, the Company had a stock repurchase plan which authorized management to purchase up to $2,000 of the Company's common stock over a 12-month period. In April 2016, the authorization of the stock purchase plan was allowed to expire. No shares had been repurchased under the authorization prior to its expiration.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Notes)	12 Months Ended
	Dec. 31, 2016
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, 2016 , 2015 and 2014 . Noncredit-related Unrealized Unrealized Unrealized Accumulated Gains (Losses) Gains (Losses) Gains Other on Securities on Securities (Losses) on Comprehensive with OTTI without OTTI Derivatives Income (Loss) Balance, December 31, 2013 $ (1,439 ) $ (4,217 ) $ 2,118 $ (3,538 ) Other comprehensive income (loss) before reclassifications 1,133 5,085 (2,331 ) 3,887 Amounts reclassified from accumulated other comprehensive income 306 (452 ) 51 (95 ) Current period, other comprehensive income (loss) 1,439 4,633 (2,280 ) 3,792 Balance, December 31, 2014 — 416 (162 ) 254 Other comprehensive (loss) before reclassifications — (21 ) (709 ) (730 ) Amounts reclassified from accumulated other comprehensive income — (53 ) 99 46 Current period other comprehensive (loss) — (74 ) (610 ) (684 ) 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 Current period other comprehensive income (loss) — (1,514 ) 902 (612 ) Balance, December 31, 2016 $ — $ (1,172 ) $ 130 $ (1,042 )

Regulatory Capital Requirements

Regulatory Capital Requirements (Notes)	12 Months Ended
	Dec. 31, 2016
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, 2016 . The Company's and West Bank's capital amounts and ratios are presented in the following table as of December 31, 2016 and 2015 . Actual For Capital Adequacy Purposes With Capital Conservation Buffer To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio As of December 31, 2016: Total Capital (to Risk-Weighted Assets) Consolidated $ 202,530 11.87 % $ 147,108 8.625 % N/A N/A West Bank 186,118 11.04 145,414 8.625 $ 168,597 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 186,418 10.93 112,996 6.625 N/A N/A West Bank 170,006 10.08 111,695 6.625 134,877 8.00 Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 166,418 9.76 87,412 5.125 N/A N/A West Bank 170,006 10.08 86,406 5.125 109,588 6.50 Tier 1 Capital (to Average Assets) Consolidated 186,418 10.14 73,530 4.00 N/A N/A West Bank 170,006 9.34 72,807 4.00 91,009 5.00 As of December 31, 2015: Total Capital (to Risk-Weighted Assets) Consolidated $ 187,790 12.12 % $ 123,979 8.00 % N/A N/A West Bank 174,450 11.32 123,279 8.00 $ 154,099 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 172,807 11.15 92,984 6.00 N/A N/A West Bank 159,467 10.35 92,460 6.00 123,279 8.00 Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 152,807 9.86 69,738 4.50 N/A N/A West Bank 159,467 10.35 69,345 4.50 100,164 6.50 Tier 1 Capital (to Average Assets) Consolidated 172,807 9.91 69,764 4.00 N/A N/A West Bank 159,467 9.20 69,352 4.00 86,690 5.00 On January 1, 2015, the Company and West Bank became subject to the rules of the Basel III regulatory capital framework and related Dodd-Frank Wall Street Reform and Consumer Protection Act changes. The new rules included the implementation of a new 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 during 2016 was 0.625 percent. 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, 2016 , 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 banks by applicable law. The Company's tangible common equity ratio was 8.92 percent and 8.71 percent at December 31, 2016 and 2015 , 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, 2016 and 2015 , the Company had no intangible assets

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Dec. 31, 2016
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 $1,293 , $1,741 and $1,823 , for the years ended December 31, 2016 , 2015 and 2014 , respectively. Total estimated minimum rental commitments were as follows as of December 31, 2016 . 2017 $ 1,392 2018 1,400 2019 1,402 2020 1,402 2021 1,347 Thereafter 6,461 $ 13,404 The Company had commitments to invest in qualified affordable housing projects totaling $5,768 and $4,292 as of December 31, 2016 and 2015 , 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 $6,393 and $4,579 as of December 31, 2016 and 2015 , 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, 2016 and 2015 . 2016 2015 Commitments to extend credit $ 614,681 $ 558,633 Standby letters of credit 5,487 8,720 $ 620,168 $ 567,353 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. Commitments to extend credit generally expire within one year. Home equity commitments to extend credit of approximately $12,168 at December 31, 2016 , expire within ten years. 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, 2016 and 2015 , no amounts have been recorded as liabilities for West Bank's potential obligations under these guarantees. West Bank has executed MPF Master Commitments (Commitments) with the FHLB of Des Moines to deliver 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 mortgage loans. The term of the most recent Commitment was through January 16, 2015 and was not renewed. At December 31, 2016 , the liability represented by the present value of the credit enhancement fees less any expected losses in the mortgages delivered under the Commitments was approximately $218 . The outstanding balance of mortgage loans sold under the MPF Program was $112,084 and $139,152 at December 31, 2016 and 2015 , 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. Approximately 40 percent of the securities issued by state and political subdivisions involve governmental entities within the state of Iowa. The remaining securities issued by state and political subdivisions were issued by government entities in 17 other states with similar credit risks. 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, 2016
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 2016 or 2015 . 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. 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. 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. Level 1 securities include certain corporate bonds and preferred stocks, and would include U.S. Treasuries, if any were held. Level 2 securities include U.S. government and agency securities, collateralized mortgage obligations, mortgage-backed securities, state and political subdivision securities and one trust preferred security. The Company currently holds no investment securities classified as Level 3. Generally, management obtains the fair value of investment securities at the end of each reporting period via a third-party pricing service. Management, with the assistance of an independent investment portfolio management firm, 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. In addition, the Company has a practice of further testing the fair values by selecting a sample of investment securities from each category of securities. For that sample, the prices 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 assets and liabilities measured at fair value on a recurring basis by level as of December 31, 2016 and 2015 . 2016 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: U.S. government agencies and corporations $ 2,593 $ — $ 2,593 $ — State and political subdivisions 64,336 — 64,336 — Collateralized mortgage obligations 101,950 — 101,950 — Mortgage-backed securities 80,158 — 80,158 — Trust preferred security 1,250 — 1,250 — Corporate notes 10,350 10,050 300 — Derivative instrument, interest rate swap 1,068 — 1,068 — Financial liabilities: Derivative instrument, interest rate swap $ 496 $ — $ 496 $ — 2015 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: U.S. government agencies and corporations $ 2,692 $ — $ 2,692 $ — State and political subdivisions 73,079 — 73,079 — Collateralized mortgage obligations 132,615 — 132,615 — Mortgage-backed securities 101,088 — 101,088 — Trust preferred security 1,105 — 1,105 — Corporate notes and equity securities 10,135 9,835 300 — Financial liabilities: Derivative instrument, interest rate swap $ 774 $ — $ 774 $ — The following table presents changes in investment securities available for sale with significant unobservable inputs (Level 3) for the year ended December 31, 2014. The activity in the table consists of one pooled trust preferred security, which was sold in December 2014. Investment securities available for sale: 2014 Beginning balance $ 1,850 Transfer into Level 3 — Total gains or (losses): Included in earnings (493 ) Included in other comprehensive income 2,321 Sale of security (3,593 ) Principal payments (85 ) Ending balance $ — 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 December 31, 2016 and 2015 , impaired loans of $0 and $98 , respectively, for which a fair value adjustment was recorded, were classified as Level 3. Impaired loans 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 methodologies for estimating the fair value of financial assets and liabilities that are measured at fair value on a recurring or nonrecurring basis are discussed above. The methodologies for other financial assets and liabilities are discussed below. Cash and due from banks : The carrying amount approximates fair value. Federal funds sold : The carrying amount approximates fair value. Investment securities held to maturity : The fair values of these securities, which are all state and political subdivisions, are determined by the same method described previously for investment securities available for sale. FHLB stock : The fair value of this restricted stock is estimated at its carrying value and redemption price of $100 per share. Loans : The fair values of fixed rate loans are estimated using discounted cash flow analysis based on observable market interest rates currently being offered for loans with similar terms to borrowers with similar credit quality. The carrying values of variable rate loans approximate their fair values. Deposits : The carrying amounts for demand and savings deposits, which represent the amounts payable on demand, approximate their fair values. The fair values for time deposits are estimated using discounted cash flow analysis, based on observable market interest rates currently being offered on time deposits with similar terms. Accrued interest receivable and payable : The fair values of both accrued interest receivable and payable approximate their carrying amounts. Borrowings : The carrying amounts of federal funds purchased, short-term borrowings, variable rate FHLB advances and variable rate long-term borrowings approximate their fair values. Fair values of subordinated notes, fixed rate FHLB advances and other long-term borrowings are estimated using a discounted cash flow analysis, based on observable market interest rates currently being offered with similar terms. Commitments to extend credit and standby letters of credit : The approximate fair values of commitments and standby letters of credit are based on the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and creditworthiness of the counterparties. The following table presents the carrying amounts and approximate fair values of financial assets and liabilities as of December 31, 2016 and 2015 . 2016 2015 Fair Value Hierarchy Level Carrying Amount Approximate Fair Value Carrying Amount Approximate Fair Value Financial assets: Cash and due from banks Level 1 $ 40,943 $ 40,943 $ 57,329 $ 57,329 Federal funds sold Level 1 35,893 35,893 15,322 15,322 Investment securities available for sale See previous table 260,637 260,637 320,714 320,714 Investment securities held to maturity Level 2 48,386 47,789 51,259 51,918 Federal Home Loan Bank stock Level 1 10,771 10,771 12,447 12,447 Loans, net (1) Level 2 1,383,758 1,382,569 1,231,721 1,235,336 Accrued interest receivable Level 1 5,321 5,321 4,688 4,688 Interest rate swap See previous table 1,068 1,068 — — Financial liabilities: Deposits Level 2 $ 1,546,605 $ 1,546,307 $ 1,440,729 $ 1,440,762 Federal funds purchased Level 1 9,690 9,690 2,760 2,760 Short-term borrowings Level 1 — — 19,000 19,000 Subordinated notes, net Level 2 20,398 12,703 20,385 11,674 Federal Home Loan Bank advances, net Level 2 99,886 99,959 98,385 98,812 Long-term debt, net Level 2 5,126 5,054 8,405 8,314 Accrued interest payable Level 1 280 280 343 343 Interest rate swap See previous table 496 496 774 774 Off-balance-sheet financial instruments: Commitments to extend credit Level 3 — — — — Standby letters of credit Level 3 — — — — (1) All loans are Level 2 except impaired loans of $0 and $98 as of December 31, 2016 and 2015 , respectively, which are Level 3.

West Bancorporation, Inc. (Pare

West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Notes)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only 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, 2016 and 2015 2016 2015 ASSETS Cash $ 3,945 $ 13,775 Investment in West Bank 168,302 159,038 Investment in West Bancorporation Capital Trust I 619 619 Premises, net 18,194 7,898 Other assets 1,256 111 Total assets $ 192,316 $ 181,441 LIABILITIES AND STOCKHOLDERS' EQUITY LIABILITIES Accrued expenses and other liabilities $ 1,416 $ 274 Subordinated notes, net 20,398 20,385 Long-term debt, net 5,126 8,405 Total liabilities 26,940 29,064 STOCKHOLDERS' EQUITY Preferred stock — — Common stock 3,000 3,000 Additional paid-in capital 21,462 20,067 Retained earnings 141,956 129,740 Accumulated other comprehensive (loss) (1,042 ) (430 ) Total stockholders' equity 165,376 152,377 Total liabilities and stockholders' equity $ 192,316 $ 181,441 Statements of Income Years Ended December 31, 2016, 2015 and 2014 2016 2015 2014 Operating income: Equity in net income of West Bank $ 23,544 $ 22,546 $ 19,773 Equity in net income of West Bancorporation Capital Trust I 23 21 21 Gain on disposition of premises — — 1,627 Realized investment securities loss — — (493 ) Intercompany rental income 503 207 126 Other rental income 50 43 — Total operating income 24,120 22,817 21,054 Operating expenses: Interest on subordinated notes 728 705 753 Interest on long-term debt 145 232 297 Occupancy 280 170 78 Other real estate owned — 10 1,725 Other expenses 443 486 604 Total operating expenses 1,596 1,603 3,457 Income before income taxes 22,524 21,214 17,597 Income tax benefits (492 ) (528 ) (2,443 ) Net income $ 23,016 $ 21,742 $ 20,040 Statements of Cash Flows Years Ended December 31, 2016, 2015 and 2014 2016 2015 2014 Cash Flows from Operating Activities: Net income $ 23,016 $ 21,742 $ 20,040 Adjustments to reconcile net income to net cash provided by operating activities: Equity in net income of West Bank (23,544 ) (22,546 ) (19,773 ) Equity in net income of West Bancorporation Capital Trust I (23 ) (21 ) (21 ) Dividends received from West Bank 14,400 13,900 12,700 Dividends received from West Bancorporation Capital Trust I 23 21 21 Realized investment securities loss — — 493 Amortization 20 23 26 Depreciation 244 139 39 Gain on disposition of premises — — (1,627 ) Write-down of other real estate owned — — 1,681 Loss on sale of other real estate owned — 8 10 Deferred income tax (benefits) 97 99 362 Change in assets and liabilities: (Increase) decrease in other assets (79 ) 1,428 (1,248 ) Increase (decrease) in accrued expenses and other liabilities 641 (31 ) (32 ) Net cash provided by operating activities 14,795 14,762 12,671 Cash Flows from Investing Activities: Proceeds from paydown on securities available for sale — — 85 Proceeds from sales of premises — — 3,000 Purchases of premises (10,539 ) (1,386 ) (4,097 ) Proceeds from sales of other real estate owned — 2,227 1,530 Proceeds from settlement of other assets — 3,593 — Net cash provided by (used in) investing activities (10,539 ) 4,434 518 Cash Flows from Financing Activities: Principal payments on long-term debt (3,286 ) (4,261 ) (3,260 ) Common stock cash dividends (10,800 ) (9,952 ) (7,842 ) Net cash used in financing activities (14,086 ) (14,213 ) (11,102 ) Net increase (decrease) in cash (9,830 ) 4,983 2,087 Cash: Beginning 13,775 8,792 6,705 Ending $ 3,945 $ 13,775 $ 8,792 Supplemental Disclosure of Noncash Investing and Financing Activities: Transfer of securities available for sale to other assets, sale not settled — — 3,593

Selected Quarterly Financial Da

Selected Quarterly Financial Data (unaudited) (Notes)	12 Months Ended
	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Quarterly Financial Information [Text Block]	Selected Quarterly Financial Data (unaudited) 2016 Three months ended March 31 June 30 September 30 December 31 Interest income $ 15,524 $ 16,209 $ 16,696 $ 16,565 Interest expense 1,825 1,936 1,975 2,140 Net interest income 13,699 14,273 14,721 14,425 Provision for loan losses 200 500 200 100 Net interest income after provision for loan losses 13,499 13,773 14,521 14,325 Noninterest income 2,230 1,903 1,919 1,930 Noninterest expense 7,799 7,819 7,993 7,537 Income before income taxes 7,930 7,857 8,447 8,718 Income taxes 2,234 2,381 2,634 2,687 Net income $ 5,696 $ 5,476 $ 5,813 $ 6,031 Basic earnings per common share $ 0.35 $ 0.34 $ 0.36 $ 0.37 Diluted earnings per common share $ 0.35 $ 0.34 $ 0.36 $ 0.37 2015 Three months ended March 31 June 30 September 30 December 31 Interest income $ 14,521 $ 14,819 $ 15,147 $ 15,660 Interest expense 1,558 1,465 1,441 1,529 Net interest income 12,963 13,354 13,706 14,131 Provision for loan losses — 200 200 450 Net interest income after provision for loan losses 12,963 13,154 13,506 13,681 Noninterest income 1,860 1,922 1,935 2,486 Noninterest expense 7,446 7,443 7,549 7,630 Income before income taxes 7,377 7,633 7,892 8,537 Income taxes 2,274 2,361 2,466 2,596 Net income $ 5,103 $ 5,272 $ 5,426 $ 5,941 Basic earnings per common share $ 0.32 $ 0.33 $ 0.34 $ 0.37 Diluted earnings per common share $ 0.32 $ 0.33 $ 0.34 $ 0.37

Organization and Nature of Bu29

Organization and Nature of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
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 , sometimes referred to as the Codification or ASC. In preparing the 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 and other than temporary impairment (OTTI) 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, West Bank's wholly-owned subsidiary WB Funding Corporation (which owned an interest in a limited liability company that was sold in the fourth quarter of 2015), and West Bank's 99.99 percent owned subsidiary ICD IV, LLC (a community development partnership that was liquidated during the third quarter of 2014 because the underlying loan matured). 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.
Reclassification, Policy [Policy Text Block]	Reclassification: Certain amounts in prior year financial statements have been reclassified, with no effect on net income, comprehensive income or stockholder's equity, to conform with current period presentation.
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. The Company has determined that its business is comprised of one operating segment, which is banking. The banking segment generates revenue through interest and fees on loans, service charges on deposit accounts, interest on investment securities, fees for trust services and other miscellaneous banking related activities. This segment includes the Company, West Bank, and related elimination entries between the two, as the Company's operation is similar to that of West Bank.
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 OTTI securities and the effective portion of the change in fair value of derivative instruments.
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 and deposits 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 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. 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 those outstanding loan balances. 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.
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 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 past due 90 days 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 West Bank'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 least annually. 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. 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, 2016 and 2015 , the Company had no other real estate owned.
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. The Company managed or administered accounts with assets totaling $ 251,767 as of December 31, 2016 , compared to assets totaling $209,920 as of December 31, 2015 .
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 accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the resulting designation. As of December 31, 2016 , the Company had cash flow hedging relationships, which were derivatives to hedge the exposure to variability in expected future cash flows. To qualify for hedge accounting, the Company must comply with the detailed rules and documentation requirements at the inception of the hedge, and hedge effectiveness is assessed at inception and on a quarterly basis throughout the life of each hedging relationship. Hedge ineffectiveness, if any, is measured periodically throughout the life of the hedging relationship. The Company does not use derivatives for trading or speculative purposes. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is initially reported in OCI, net of deferred taxes, and subsequently reclassified to interest income or expense when the hedged transaction affects earnings, while the ineffective portion of changes in the fair value of the derivative, if any, is recognized immediately in other noninterest income. The Company assesses the effectiveness of the hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instrument with the cumulative changes in cash flows of the designated hedged item or transaction.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Stock-based compensation: The West Bancorporation, Inc. 2012 Equity Incentive Plan (the 2012 Plan) was approved by the stockholders in 2012 as a means to attract, retain and reward selected participants. The 2012 Plan is 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 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. The Company currently assumes no projected forfeitures on its stock-based compensation, since all RSUs are expected to vest and no forfeitures have occurred as of December 31, 2016 .
Deferred compensation [Policy Text Block]	Deferred compensation: The West Bancorporation, Inc. Deferred Compensation Plan (the Deferred Compensation Plan) was adopted effective January 1, 2013, to provide 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, 2016 , no individuals had chosen to participate in the Plan.
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 loss, operating loss, and tax credit carryforwards, 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. 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 related to income taxes are recorded as other noninterest expense in the consolidated income statements.
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 was 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. The incremental shares, to the extent they would have been dilutive, were included in the denominator of the diluted earnings per common share calculation.
New Accounting Pronouncements, Policy [Policy Text Block]	Current accounting developments : In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606): Summary and Amendments that Create Revenue from Contracts with Customers (Topic 606) and Other Assets and Deferred Costs—Contracts with Customers (Subtopic 340-40) . 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. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2017. The Company has assessed the impact of this guidance and does not expect the guidance to have a material impact on the Company's consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The update simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. For public companies, this update was effective for interim and annual periods beginning after December 15, 2015, and was applied retrospectively. The adoption of this guidance required a balance sheet reclassification of unamortized debt issuance costs, which did not have a material impact on the Company's consolidated financial statements. 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 will be effective for interim and annual periods beginning after December 15, 2017, and is to be applied on a modified retrospective basis. The Company is currently assessing the impact of this guidance, but does not expect the guidance to 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 update will require business entities to recognize lease assets and liabilities on the balance sheet and to disclose key information about leasing arrangements. A lessee would recognize a liability to make lease payments and a right-of-use asset representing its right to use the leased asset for the lease term. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2018, and is to be applied on a modified retrospective basis. The Company is currently assessing the impact of this guidance, but does not expect the guidance to have a material impact on the Company's consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718). The update simplifies several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The guidance also allows an entity to make an entity-wide accounting policy election to either estimate expected forfeitures or account for forfeitures as they occur. For public companies, the update is effective for annual periods beginning after December 15, 2016. Portions of the amended guidance are to be applied using a modified retrospective transition method, and others require prospective application. The adoption of this guidance will not have a material impact on the Company's consolidated financial statements. 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. The income statement reflects 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 is currently planning for the implementation of this accounting standard. It is too early to assess the impact that this guidance will have on the Company's consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The amendments in this update provide guidance for eight specific cash flow classification issues for which current guidance is unclear or does not exist, thereby reducing diversity in practice. For public companies, the update is effective for annual periods beginning after December 15, 2017. The Company is currently assessing the impact of this guidance, but does not expect the guidance to have a material impact on the Company's consolidated financial statements. In October 2016, the FASB issued ASU 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory. This update simplifies the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. The new guidance states that an entity should recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, the amendments in this update eliminate the exception for an intra-entity transfer of an asset other than inventory. For public companies, the update is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods. Early adoption is permitted. The Company is currently assessing the impact of this guidance, but does not expect the guidance to have a material impact on the Company's consolidated financial statements.
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	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.
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 2016 or 2015 . 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. 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. 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. Level 1 securities include certain corporate bonds and preferred stocks, and would include U.S. Treasuries, if any were held. Level 2 securities include U.S. government and agency securities, collateralized mortgage obligations, mortgage-backed securities, state and political subdivision securities and one trust preferred security. The Company currently holds no investment securities classified as Level 3. Generally, management obtains the fair value of investment securities at the end of each reporting period via a third-party pricing service. Management, with the assistance of an independent investment portfolio management firm, 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. In addition, the Company has a practice of further testing the fair values by selecting a sample of investment securities from each category of securities. For that sample, the prices 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. The methodologies for estimating the fair value of financial assets and liabilities that are measured at fair value on a recurring or nonrecurring basis are discussed above. The methodologies for other financial assets and liabilities are discussed below. Cash and due from banks : The carrying amount approximates fair value. Federal funds sold : The carrying amount approximates fair value. Investment securities held to maturity : The fair values of these securities, which are all state and political subdivisions, are determined by the same method described previously for investment securities available for sale. FHLB stock : The fair value of this restricted stock is estimated at its carrying value and redemption price of $100 per share. Loans : The fair values of fixed rate loans are estimated using discounted cash flow analysis based on observable market interest rates currently being offered for loans with similar terms to borrowers with similar credit quality. The carrying values of variable rate loans approximate their fair values. Deposits : The carrying amounts for demand and savings deposits, which represent the amounts payable on demand, approximate their fair values. The fair values for time deposits are estimated using discounted cash flow analysis, based on observable market interest rates currently being offered on time deposits with similar terms. Accrued interest receivable and payable : The fair values of both accrued interest receivable and payable approximate their carrying amounts. Borrowings : The carrying amounts of federal funds purchased, short-term borrowings, variable rate FHLB advances and variable rate long-term borrowings approximate their fair values. Fair values of subordinated notes, fixed rate FHLB advances and other long-term borrowings are estimated using a discounted cash flow analysis, based on observable market interest rates currently being offered with similar terms. Commitments to extend credit and standby letters of credit : The approximate fair values of commitments and standby letters of credit are based on the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and creditworthiness of the counterparties.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
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 for the years ended December 31, 2016 , 2015 and 2014 , is presented below. (dollars and number of shares in thousands, except per share data) 2016 2015 2014 Net income $ 23,016 $ 21,742 $ 20,040 Weighted average common shares outstanding 16,117 16,050 16,004 Weighted average effect of restricted stock units outstanding 54 46 38 Diluted weighted average common shares outstanding 16,171 16,096 16,042 Basic earnings per common share $ 1.43 $ 1.35 $ 1.25 Diluted earnings per common share $ 1.42 $ 1.35 $ 1.25 Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation 102 140 —

Investment securities (Tables)

Investment securities (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Securities available for sale: U.S. government agencies and corporations $ 2,524 $ 69 $ — $ 2,593 State and political subdivisions 64,551 376 (591 ) 64,336 Collateralized mortgage obligations (1) 103,038 255 (1,343 ) 101,950 Mortgage-backed securities (1) 80,614 341 (797 ) 80,158 Trust preferred security 1,784 — (534 ) 1,250 Corporate notes 10,326 25 (1 ) 10,350 $ 262,837 $ 1,066 $ (3,266 ) $ 260,637 Securities held to maturity: State and political subdivisions $ 48,386 $ 70 $ (667 ) $ 47,789 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Fair Value Securities available for sale: U.S. government agencies and corporations $ 2,551 $ 141 $ — $ 2,692 State and political subdivisions 71,431 1,669 (21 ) 73,079 Collateralized mortgage obligations (1) 133,414 491 (1,290 ) 132,615 Mortgage-backed securities (1) 101,299 485 (696 ) 101,088 Trust preferred security 1,773 — (668 ) 1,105 Corporate notes and equity securities 10,130 61 (56 ) 10,135 $ 320,598 $ 2,847 $ (2,731 ) $ 320,714 Securities held to maturity: State and political subdivisions $ 51,259 $ 883 $ (224 ) $ 51,918 (1) All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities guaranteed by GNMA or issued by FNMA and real estate mortgage investment conduits guaranteed by FHLMC or GNMA.
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, 2016 , 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 and mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, collateralized mortgage obligations and mortgage-backed securities are not included in the maturity categories in the following maturity summary. 2016 Amortized Cost Fair Value Due in one year or less $ 6,027 $ 6,101 Due after one year through five years 11,725 11,809 Due after five years through ten years 38,274 37,996 Due after ten years 23,159 22,623 79,185 78,529 Collateralized mortgage obligations and mortgage-backed securities 183,652 182,108 $ 262,837 $ 260,637 The amortized cost and fair value of investment securities held to maturity as of December 31, 2016 , by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity. 2016 Amortized Cost Fair Value Due after one year through five years $ 486 $ 474 Due after five years through ten years 19,370 19,110 Due after ten years 28,530 28,205 $ 48,386 $ 47,789
Schedule of Realized Gain (Loss) [Table Text Block]	The details of the sales of investment securities for the years ended December 31, 2016 , 2015 and 2014 are summarized in the following table. 2016 2015 2014 Proceeds from sales $ 3,054 $ 16,946 $ 36,582 Gross gains on sales 66 54 1,050 Gross losses on sales — 7 827
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, 2016 and 2015 . 2016 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: U.S. government agencies and corporations $ — $ — $ — $ — $ — $ — State and political subdivisions 34,903 (591 ) — — 34,903 (591 ) Collateralized mortgage obligations 75,771 (1,255 ) 2,538 (88 ) 78,309 (1,343 ) Mortgage-backed securities 60,221 (797 ) — — 60,221 (797 ) Trust preferred security — — 1,250 (534 ) 1,250 (534 ) Corporate notes 1,499 (1 ) — — 1,499 (1 ) $ 172,394 $ (2,644 ) $ 3,788 $ (622 ) $ 176,182 $ (3,266 ) Securities held to maturity: State and political subdivisions $ 32,976 $ (458 ) $ 3,968 $ (209 ) $ 36,944 $ (667 ) 2015 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: U.S. government agencies and corporations $ — $ — $ — $ — $ — $ — State and political subdivisions 321 (1 ) 2,053 (20 ) 2,374 (21 ) Collateralized mortgage obligations 53,043 (449 ) 38,286 (841 ) 91,329 (1,290 ) Mortgage-backed securities 67,662 (600 ) 7,200 (96 ) 74,862 (696 ) Trust preferred security — — 1,105 (668 ) 1,105 (668 ) Corporate notes and equity securities 4,500 (56 ) — — 4,500 (56 ) $ 125,526 $ (1,106 ) $ 48,644 $ (1,625 ) $ 174,170 $ (2,731 ) Securities held to maturity: State and political subdivisions $ 2,832 $ (42 ) $ 7,341 $ (182 ) $ 10,173 $ (224 )

Loans and Allowance for Loan 32

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . 2016 2015 Commercial $ 334,014 $ 349,051 Real estate: Construction, land and land development 205,610 174,602 1-4 family residential first mortgages 47,184 51,370 Home equity 18,057 21,749 Commercial 788,000 644,176 Consumer and other loans 8,355 6,801 1,401,220 1,247,749 Net unamortized fees and costs (1,350 ) (1,061 ) $ 1,399,870 $ 1,246,688
Schedule of Loan Transactions with Related Parties [Table Text Block]	Loan transactions with related parties were as follows for the years ended December 31, 2016 and 2015 . 2016 2015 Balance, beginning of year $ 138,706 $ 129,780 New loans 60,712 37,049 Repayments (7,721 ) (28,123 ) Balance, end of year $ 191,697 $ 138,706
Troubled Debt Restructured Loans [Table Text Block]	The following table presents the TDR loans by segment as of December 31, 2016 and 2015 . 2016 2015 Troubled debt restructured loans (1) : Commercial $ 91 $ 102 Real estate: Construction, land and land development — 60 1-4 family residential first mortgages — 86 Home equity — — Commercial 335 445 Consumer and other loans — — Total troubled debt restructured loans $ 426 $ 693 (1) There were two TDR loans as of December 31, 2016 and three TDR loans as of December 31, 2015 , with balances of $426 and $613 , respectively, included in the nonaccrual category. There were no loan modifications considered to be TDR that occurred during the year ended December 31, 2016 , three loan modifications considered to be TDR that occurred during the year ended December 31, 2015 , and no loan modifications considered to be TDR that occurred during the year ended December 31, 2014 . The pre- and post-modification recorded investment in TDR loans that have occurred during the years ended December 31, 2016 , 2015 and 2014 , totaled $0 , $149 and $0 , respectively. The financial impact of charge-offs or specific reserves for these modified loans was immaterial. The recorded investment in TDR loans that have been modified within the twelve months ended December 31, 2016 , 2015 and 2014 , which have subsequently had a payment default, totaled $0 , $110 and $0 , respectively. A TDR loan is considered to have a payment default when it is past due 30 days or more.
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, 2016 and 2015 . December 31, 2016 December 31, 2015 Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: Commercial $ 35 $ 35 $ — $ — $ — $ — Real estate: Construction, land and land development — — — 60 663 — 1-4 family residential first mortgages 108 108 — 352 360 — Home equity 41 41 — — — — Commercial 335 335 — 482 482 — Consumer and other — — — — — — 519 519 — 894 1,505 — With an allowance recorded: Commercial 91 91 91 142 142 142 Real estate: Construction, land and land development — — — — — — 1-4 family residential first mortgages — — — — — — Home equity 276 276 276 270 270 270 Commercial 136 136 136 155 155 155 Consumer and other — — — — — — 503 503 503 567 567 567 Total: Commercial 126 126 91 142 142 142 Real estate: Construction, land and land development — — — 60 663 — 1-4 family residential first mortgages 108 108 — 352 360 — Home equity 317 317 276 270 270 270 Commercial 471 471 136 637 637 155 Consumer and other — — — — — — Total impaired loans $ 1,022 $ 1,022 $ 503 $ 1,461 $ 2,072 $ 567 The balance of impaired loans at December 31, 2016 was composed of loans to 10 different borrowers, and the balance of impaired loans at December 31, 2015 was composed of loans to 13 different borrowers. As of December 31, 2016 , $946 of total impaired loans to 7 of the borrowers were also considered impaired as of December 31, 2015 . 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, 2016 , 2015 and 2014 . December 31, 2016 December 31, 2015 December 31, 2014 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial $ 3 $ — $ 116 $ — $ 271 $ — Real estate: Construction, land and land development 8 — 259 10 397 15 1-4 family residential first mortgages 212 1 311 1 355 7 Home equity 3 — — — 7 — Commercial 393 — 952 — 674 6 Consumer and other — — 2 — — — 619 1 1,640 11 1,704 28 With an allowance recorded: Commercial 127 — 204 2 544 11 Real estate: Construction, land and land development — — 190 6 1,423 66 1-4 family residential first mortgages — — — — 144 — Home equity 263 — 237 — 125 — Commercial 145 — 164 — 54 — Consumer and other — — — — — — 535 — 795 8 2,290 77 Total: Commercial 130 — 320 2 815 11 Real estate: Construction, land and land development 8 — 449 16 1,820 81 1-4 family residential first mortgages 212 1 311 1 499 7 Home equity 266 — 237 — 132 — Commercial 538 — 1,116 — 728 6 Consumer and other — — 2 — — — Total impaired loans $ 1,154 $ 1 $ 2,435 $ 19 $ 3,994 $ 105
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, 2016 and 2015 . December 31, 2016 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 $ 109 $ — $ — $ 109 $ 333,779 $ 126 $ 334,014 Real estate: Construction, land and land development — — — — 205,610 — 205,610 1-4 family residential first mortgages 64 — — 64 47,012 108 47,184 Home equity — — — — 17,740 317 18,057 Commercial — — — — 787,529 471 788,000 Consumer and other — — — — 8,355 — 8,355 Total $ 173 $ — $ — $ 173 $ 1,400,025 $ 1,022 $ 1,401,220 December 31, 2015 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 $ 1 $ 38 $ — $ 39 $ 348,870 $ 142 $ 349,051 Real estate: Construction, land and land development — — — — 174,602 — 174,602 1-4 family residential first mortgages 317 — — 317 50,721 332 51,370 Home equity — — — — 21,479 270 21,749 Commercial — — — — 643,539 637 644,176 Consumer and other — — — — 6,801 — 6,801 Total $ 318 $ 38 $ — $ 356 $ 1,246,012 $ 1,381 $ 1,247,749
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, 2016 and 2015 . December 31, 2016 Pass Watch Substandard Doubtful Total Commercial $ 329,366 $ 3,303 $ 1,345 $ — $ 334,014 Real estate: Construction, land and land development 204,572 — 1,038 — 205,610 1-4 family residential first mortgages 46,278 798 108 — 47,184 Home equity 17,646 — 411 — 18,057 Commercial 769,010 18,392 598 — 788,000 Consumer and other 8,355 — — — 8,355 Total $ 1,375,227 $ 22,493 $ 3,500 $ — $ 1,401,220 December 31, 2015 Pass Watch Substandard Doubtful Total Commercial $ 344,650 $ 2,936 $ 1,465 $ — $ 349,051 Real estate: Construction, land and land development 173,373 — 1,229 — 174,602 1-4 family residential first mortgages 50,375 517 478 — 51,370 Home equity 21,401 68 280 — 21,749 Commercial 619,608 22,977 1,591 — 644,176 Consumer and other 6,786 — 15 — 6,801 Total $ 1,216,193 $ 26,498 $ 5,058 $ — $ 1,247,749
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, 2016 , 2015 and 2014 . 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 2015 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 4,415 $ 2,151 $ 466 $ 534 $ 6,013 $ 28 $ 13,607 Charge-offs (408 ) — (23 ) (2 ) — (6 ) (439 ) Recoveries 579 250 7 87 12 14 949 Provision (1) (217 ) (63 ) 58 (138 ) 1,229 (19 ) 850 Ending balance $ 4,369 $ 2,338 $ 508 $ 481 $ 7,254 $ 17 $ 14,967 2014 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Beginning balance $ 4,199 $ 3,032 $ 613 $ 403 $ 5,485 $ 59 $ 13,791 Charge-offs (836 ) — (131 ) (138 ) (112 ) — (1,217 ) Recoveries 116 8 45 99 11 4 283 Provision (1) 936 (889 ) (61 ) 170 629 (35 ) 750 Ending balance $ 4,415 $ 2,151 $ 466 $ 534 $ 6,013 $ 28 $ 13,607 (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, 2016 and 2015 . December 31, 2016 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 91 $ — $ — $ 276 $ 136 $ — $ 503 Collectively evaluated for impairment 3,790 2,639 317 202 8,561 100 15,609 Total $ 3,881 $ 2,639 $ 317 $ 478 $ 8,697 $ 100 $ 16,112 December 31, 2015 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 142 $ — $ — $ 270 $ 155 $ — $ 567 Collectively evaluated for impairment 4,227 2,338 508 211 7,099 17 14,400 Total $ 4,369 $ 2,338 $ 508 $ 481 $ 7,254 $ 17 $ 14,967
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, 2016 and 2015 . December 31, 2016 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 126 $ — $ 108 $ 317 $ 471 $ — $ 1,022 Collectively evaluated for impairment 333,888 205,610 47,076 17,740 787,529 8,355 1,400,198 Total $ 334,014 $ 205,610 $ 47,184 $ 18,057 $ 788,000 $ 8,355 $ 1,401,220 December 31, 2015 Real Estate Commercial Construction and Land 1-4 Family Residential Home Equity Commercial Consumer and Other Total Ending balance: Individually evaluated for impairment $ 142 $ 60 $ 352 $ 270 $ 637 $ — $ 1,461 Collectively evaluated for impairment 348,909 174,542 51,018 21,479 643,539 6,801 1,246,288 Total $ 349,051 $ 174,602 $ 51,370 $ 21,749 $ 644,176 $ 6,801 $ 1,247,749

Premises and Equipment, Net (Ta

Premises and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment [Table Text Block]	Premises and equipment consisted of the following as of December 31, 2016 and 2015 . 2016 2015 Land $ 4,323 $ 2,823 Buildings 14,344 5,305 Leasehold improvements 3,843 3,661 Furniture and equipment 7,637 5,793 30,147 17,582 Accumulated depreciation 6,833 6,020 $ 23,314 $ 11,562

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Schedule of Maturities of Time Deposits [Table Text Block]	The scheduled maturities of time deposits were as follows as of December 31, 2016 . 2017 $ 67,142 2018 30,911 2019 11,425 2020 3,617 2021 2,919 $ 116,014

Federal Home Loan Bank Advanc35

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2016
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 long-term advances as of December 31, 2016 and 2015 . December 31, 2016 December 31, 2015 Maturity Interest Effective Interest Effective Date Variable/Fixed Rate Rate (1) Balance Rate Rate (1) Balance 1/29/2018 Fixed (2) 2.70% 2.70% $ 25,000 2.70 % 2.70 % $ 25,000 12/23/2019 Variable 1.28% 3.26% 25,000 0.86 % 2.83 % 25,000 6/22/2020 Variable 1.30% 3.45% 25,000 0.88 % 3.02 % 25,000 9/21/2020 Variable 1.30% 4.44% 30,000 0.88 % 4.44 % 30,000 105,000 105,000 Discount for modification (5,114 ) (6,615 ) Total FHLB advances, net of discount $ 99,886 $ 98,385 (1) The effective interest rate for the variable rate advances includes the effects of the discount fee amortization and interest rate swaps. (2) Callable quarterly.

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 are shown in the table below. 2017 $ 3,312 2018 1,514 2019 115 2020 116 2021 37 Thereafter 35 5,129 Unamortized debt issuance costs (3 ) Long-term debt, net $ 5,126

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . Notional Amount Fair Value Balance Sheet Category Weighted Average Receive Rate Weighted Average Pay Rate Maturity December 31, 2016 Interest rate swap $ 30,000 $ (496 ) Other Liabilities 1.30 % 2.52 % 9/21/2020 Interest rate swap (1) 20,000 1,068 Other Assets — % 4.81 % 9/30/2026 December 31, 2015 Interest rate swap $ 30,000 $ (774 ) Other Liabilities 0.88 % 2.52 % 9/21/2020 (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 are required related to this swap until December 30, 2018.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The following table identifies the pretax gains (losses) recognized on the Company's derivative instruments designated as cash flow hedges for the years ended December 31, 2016 , 2015 and 2014 . Effective Portion Ineffective Portion Amount of Reclassified from AOCI into Income Recognized in Income on Derivatives Pretax Gain (Loss) Recognized in Amount of Amount of Interest Rate Swaps OCI Category Gain (Loss) Category Gain (Loss) 2016 $ 882 Interest Expense $ (573 ) Other Income $ — 2015 $ (1,144 ) Interest Expense $ (160 ) Other Income $ — 2014 $ (3,759 ) Interest Expense $ (83 ) Other Income $ —

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 , 2015 and 2014 . 2016 2015 2014 Current: Federal $ 8,220 $ 8,057 $ 4,838 State 1,627 1,558 1,276 Deferred: Federal 115 112 608 State (26 ) (30 ) (73 ) Income taxes $ 9,936 $ 9,697 $ 6,649
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Total income taxes for the years ended December 31, 2016 , 2015 and 2014 , differed from the amounts computed by applying the U.S. federal income tax rate of 35 percent to income before income taxes as shown in the following table. 2016 2015 2014 Amount Percent of Pretax Income Amount Percent of Pretax Income Amount Percent of Pretax Income Computed expected tax expense $ 11,533 35.0 % $ 11,004 35.0 % $ 9,341 35.0 % State income tax expense, net of federal income tax benefit 1,004 3.0 957 3.0 596 2.2 Tax-exempt interest income (1,823 ) (5.5 ) (1,786 ) (5.7 ) (1,525 ) (5.7 ) Nondeductible interest expense to own tax-exempt securities 58 0.2 43 0.1 42 0.2 Tax-exempt increase in cash value of life insurance and gains (381 ) (1.2 ) (254 ) (0.8 ) (256 ) (1.0 ) Utilization of capital loss carryforwards — — (130 ) (0.4 ) (1,318 ) (4.9 ) Federal income tax credits (405 ) (1.2 ) (275 ) (0.9 ) (160 ) (0.6 ) Other, net (50 ) (0.1 ) 138 0.5 (71 ) (0.3 ) Income taxes $ 9,936 30.2 % $ 9,697 30.8 % $ 6,649 24.9 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	Net deferred tax assets consisted of the following components as of December 31, 2016 and 2015 . 2016 2015 Deferred tax assets: Allowance for loan losses $ 6,123 $ 5,687 Net unrealized losses on securities available for sale 719 — Net unrealized losses on interest rate swap — 473 Intangibles 462 771 Accrued expenses 706 898 Restricted stock unit compensation 446 358 State net operating loss carryforward 1,271 1,183 Capital loss carryforward — 355 Other 190 34 9,917 9,759 Deferred tax liabilities: Net deferred loan fees and costs 321 350 Net unrealized gains on securities available for sale — 210 Net unrealized gains on interest rate swap 80 — Premises and equipment 1,027 674 Other 261 317 1,689 1,551 Net deferred tax assets before valuation allowance 8,228 8,208 Valuation allowance for deferred tax assets (1,271 ) (1,538 ) Net deferred tax assets $ 6,957 $ 6,670

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 , 2015 and 2014 . 2016 2015 2014 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 261,833 $ 16.67 179,699 $ 13.39 130,337 $ 10.50 Granted 141,000 18.44 139,500 19.59 104,750 15.30 Vested (95,565 ) 16.74 (57,366 ) 13.23 (55,388 ) 10.20 Forfeited — — — — — — Nonvested shares, ending balance 307,268 $ 17.46 261,833 $ 16.67 179,699 $ 13.39

Accumulated Other Comprehensi40

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the changes in the balances of each component of AOCI, net of tax, for the years ended December 31, 2016 , 2015 and 2014 . Noncredit-related Unrealized Unrealized Unrealized Accumulated Gains (Losses) Gains (Losses) Gains Other on Securities on Securities (Losses) on Comprehensive with OTTI without OTTI Derivatives Income (Loss) Balance, December 31, 2013 $ (1,439 ) $ (4,217 ) $ 2,118 $ (3,538 ) Other comprehensive income (loss) before reclassifications 1,133 5,085 (2,331 ) 3,887 Amounts reclassified from accumulated other comprehensive income 306 (452 ) 51 (95 ) Current period, other comprehensive income (loss) 1,439 4,633 (2,280 ) 3,792 Balance, December 31, 2014 — 416 (162 ) 254 Other comprehensive (loss) before reclassifications — (21 ) (709 ) (730 ) Amounts reclassified from accumulated other comprehensive income — (53 ) 99 46 Current period other comprehensive (loss) — (74 ) (610 ) (684 ) 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 Current period other comprehensive income (loss) — (1,514 ) 902 (612 ) Balance, December 31, 2016 $ — $ (1,172 ) $ 130 $ (1,042 )

Regulatory Capital Requiremen41

Regulatory Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . Actual For Capital Adequacy Purposes With Capital Conservation Buffer To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio As of December 31, 2016: Total Capital (to Risk-Weighted Assets) Consolidated $ 202,530 11.87 % $ 147,108 8.625 % N/A N/A West Bank 186,118 11.04 145,414 8.625 $ 168,597 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 186,418 10.93 112,996 6.625 N/A N/A West Bank 170,006 10.08 111,695 6.625 134,877 8.00 Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 166,418 9.76 87,412 5.125 N/A N/A West Bank 170,006 10.08 86,406 5.125 109,588 6.50 Tier 1 Capital (to Average Assets) Consolidated 186,418 10.14 73,530 4.00 N/A N/A West Bank 170,006 9.34 72,807 4.00 91,009 5.00 As of December 31, 2015: Total Capital (to Risk-Weighted Assets) Consolidated $ 187,790 12.12 % $ 123,979 8.00 % N/A N/A West Bank 174,450 11.32 123,279 8.00 $ 154,099 10.00 % Tier 1 Capital (to Risk-Weighted Assets) Consolidated 172,807 11.15 92,984 6.00 N/A N/A West Bank 159,467 10.35 92,460 6.00 123,279 8.00 Common Equity Tier 1 Capital (to Risk-Weighted Assets) Consolidated 152,807 9.86 69,738 4.50 N/A N/A West Bank 159,467 10.35 69,345 4.50 100,164 6.50 Tier 1 Capital (to Average Assets) Consolidated 172,807 9.91 69,764 4.00 N/A N/A West Bank 159,467 9.20 69,352 4.00 86,690 5.00

Commitments and Contingencies42

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 . 2017 $ 1,392 2018 1,400 2019 1,402 2020 1,402 2021 1,347 Thereafter 6,461 $ 13,404
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, 2016 and 2015 . 2016 2015 Commitments to extend credit $ 614,681 $ 558,633 Standby letters of credit 5,487 8,720 $ 620,168 $ 567,353

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis by level as of December 31, 2016 and 2015 . 2016 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: U.S. government agencies and corporations $ 2,593 $ — $ 2,593 $ — State and political subdivisions 64,336 — 64,336 — Collateralized mortgage obligations 101,950 — 101,950 — Mortgage-backed securities 80,158 — 80,158 — Trust preferred security 1,250 — 1,250 — Corporate notes 10,350 10,050 300 — Derivative instrument, interest rate swap 1,068 — 1,068 — Financial liabilities: Derivative instrument, interest rate swap $ 496 $ — $ 496 $ — 2015 Description Total Level 1 Level 2 Level 3 Financial assets: Investment securities available for sale: U.S. government agencies and corporations $ 2,692 $ — $ 2,692 $ — State and political subdivisions 73,079 — 73,079 — Collateralized mortgage obligations 132,615 — 132,615 — Mortgage-backed securities 101,088 — 101,088 — Trust preferred security 1,105 — 1,105 — Corporate notes and equity securities 10,135 9,835 300 — Financial liabilities: Derivative instrument, interest rate swap $ 774 $ — $ 774 $ —
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	The following table presents changes in investment securities available for sale with significant unobservable inputs (Level 3) for the year ended December 31, 2014. The activity in the table consists of one pooled trust preferred security, which was sold in December 2014. Investment securities available for sale: 2014 Beginning balance $ 1,850 Transfer into Level 3 — Total gains or (losses): Included in earnings (493 ) Included in other comprehensive income 2,321 Sale of security (3,593 ) Principal payments (85 ) Ending balance $ —
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, 2016 and 2015 . 2016 2015 Fair Value Hierarchy Level Carrying Amount Approximate Fair Value Carrying Amount Approximate Fair Value Financial assets: Cash and due from banks Level 1 $ 40,943 $ 40,943 $ 57,329 $ 57,329 Federal funds sold Level 1 35,893 35,893 15,322 15,322 Investment securities available for sale See previous table 260,637 260,637 320,714 320,714 Investment securities held to maturity Level 2 48,386 47,789 51,259 51,918 Federal Home Loan Bank stock Level 1 10,771 10,771 12,447 12,447 Loans, net (1) Level 2 1,383,758 1,382,569 1,231,721 1,235,336 Accrued interest receivable Level 1 5,321 5,321 4,688 4,688 Interest rate swap See previous table 1,068 1,068 — — Financial liabilities: Deposits Level 2 $ 1,546,605 $ 1,546,307 $ 1,440,729 $ 1,440,762 Federal funds purchased Level 1 9,690 9,690 2,760 2,760 Short-term borrowings Level 1 — — 19,000 19,000 Subordinated notes, net Level 2 20,398 12,703 20,385 11,674 Federal Home Loan Bank advances, net Level 2 99,886 99,959 98,385 98,812 Long-term debt, net Level 2 5,126 5,054 8,405 8,314 Accrued interest payable Level 1 280 280 343 343 Interest rate swap See previous table 496 496 774 774 Off-balance-sheet financial instruments: Commitments to extend credit Level 3 — — — — Standby letters of credit Level 3 — — — — (1) All loans are Level 2 except impaired loans of $0 and $98 as of December 31, 2016 and 2015 , respectively, which are Level 3.

West Bancorporation, Inc. (Pa44

West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheet [Table Text Block]	Balance Sheets December 31, 2016 and 2015 2016 2015 ASSETS Cash $ 3,945 $ 13,775 Investment in West Bank 168,302 159,038 Investment in West Bancorporation Capital Trust I 619 619 Premises, net 18,194 7,898 Other assets 1,256 111 Total assets $ 192,316 $ 181,441 LIABILITIES AND STOCKHOLDERS' EQUITY LIABILITIES Accrued expenses and other liabilities $ 1,416 $ 274 Subordinated notes, net 20,398 20,385 Long-term debt, net 5,126 8,405 Total liabilities 26,940 29,064 STOCKHOLDERS' EQUITY Preferred stock — — Common stock 3,000 3,000 Additional paid-in capital 21,462 20,067 Retained earnings 141,956 129,740 Accumulated other comprehensive (loss) (1,042 ) (430 ) Total stockholders' equity 165,376 152,377 Total liabilities and stockholders' equity $ 192,316 $ 181,441
Schedule of Condensed Income Statement [Table Text Block]	Statements of Income Years Ended December 31, 2016, 2015 and 2014 2016 2015 2014 Operating income: Equity in net income of West Bank $ 23,544 $ 22,546 $ 19,773 Equity in net income of West Bancorporation Capital Trust I 23 21 21 Gain on disposition of premises — — 1,627 Realized investment securities loss — — (493 ) Intercompany rental income 503 207 126 Other rental income 50 43 — Total operating income 24,120 22,817 21,054 Operating expenses: Interest on subordinated notes 728 705 753 Interest on long-term debt 145 232 297 Occupancy 280 170 78 Other real estate owned — 10 1,725 Other expenses 443 486 604 Total operating expenses 1,596 1,603 3,457 Income before income taxes 22,524 21,214 17,597 Income tax benefits (492 ) (528 ) (2,443 ) Net income $ 23,016 $ 21,742 $ 20,040
Schedule of Condensed Cash Flow Statement [Table Text Block]	Statements of Cash Flows Years Ended December 31, 2016, 2015 and 2014 2016 2015 2014 Cash Flows from Operating Activities: Net income $ 23,016 $ 21,742 $ 20,040 Adjustments to reconcile net income to net cash provided by operating activities: Equity in net income of West Bank (23,544 ) (22,546 ) (19,773 ) Equity in net income of West Bancorporation Capital Trust I (23 ) (21 ) (21 ) Dividends received from West Bank 14,400 13,900 12,700 Dividends received from West Bancorporation Capital Trust I 23 21 21 Realized investment securities loss — — 493 Amortization 20 23 26 Depreciation 244 139 39 Gain on disposition of premises — — (1,627 ) Write-down of other real estate owned — — 1,681 Loss on sale of other real estate owned — 8 10 Deferred income tax (benefits) 97 99 362 Change in assets and liabilities: (Increase) decrease in other assets (79 ) 1,428 (1,248 ) Increase (decrease) in accrued expenses and other liabilities 641 (31 ) (32 ) Net cash provided by operating activities 14,795 14,762 12,671 Cash Flows from Investing Activities: Proceeds from paydown on securities available for sale — — 85 Proceeds from sales of premises — — 3,000 Purchases of premises (10,539 ) (1,386 ) (4,097 ) Proceeds from sales of other real estate owned — 2,227 1,530 Proceeds from settlement of other assets — 3,593 — Net cash provided by (used in) investing activities (10,539 ) 4,434 518 Cash Flows from Financing Activities: Principal payments on long-term debt (3,286 ) (4,261 ) (3,260 ) Common stock cash dividends (10,800 ) (9,952 ) (7,842 ) Net cash used in financing activities (14,086 ) (14,213 ) (11,102 ) Net increase (decrease) in cash (9,830 ) 4,983 2,087 Cash: Beginning 13,775 8,792 6,705 Ending $ 3,945 $ 13,775 $ 8,792 Supplemental Disclosure of Noncash Investing and Financing Activities: Transfer of securities available for sale to other assets, sale not settled — — 3,593

Selected Quarterly Financial 45

Selected Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	2016 Three months ended March 31 June 30 September 30 December 31 Interest income $ 15,524 $ 16,209 $ 16,696 $ 16,565 Interest expense 1,825 1,936 1,975 2,140 Net interest income 13,699 14,273 14,721 14,425 Provision for loan losses 200 500 200 100 Net interest income after provision for loan losses 13,499 13,773 14,521 14,325 Noninterest income 2,230 1,903 1,919 1,930 Noninterest expense 7,799 7,819 7,993 7,537 Income before income taxes 7,930 7,857 8,447 8,718 Income taxes 2,234 2,381 2,634 2,687 Net income $ 5,696 $ 5,476 $ 5,813 $ 6,031 Basic earnings per common share $ 0.35 $ 0.34 $ 0.36 $ 0.37 Diluted earnings per common share $ 0.35 $ 0.34 $ 0.36 $ 0.37 2015 Three months ended March 31 June 30 September 30 December 31 Interest income $ 14,521 $ 14,819 $ 15,147 $ 15,660 Interest expense 1,558 1,465 1,441 1,529 Net interest income 12,963 13,354 13,706 14,131 Provision for loan losses — 200 200 450 Net interest income after provision for loan losses 12,963 13,154 13,506 13,681 Noninterest income 1,860 1,922 1,935 2,486 Noninterest expense 7,446 7,443 7,549 7,630 Income before income taxes 7,377 7,633 7,892 8,537 Income taxes 2,274 2,361 2,466 2,596 Net income $ 5,103 $ 5,272 $ 5,426 $ 5,941 Basic earnings per common share $ 0.32 $ 0.33 $ 0.34 $ 0.37 Diluted earnings per common share $ 0.32 $ 0.33 $ 0.34 $ 0.37

Organization and Nature of Bu46

Organization and Nature of Business and Summary of Significant Accounting Policies (Branches) (Details)	Dec. 31, 2016Bank_branches
Des Moines, Iowa metropolitan area [Member]
Number of bank branches by location [Line Items]
Number of bank branches	8
Iowa City, Iowa [Member]
Number of bank branches by location [Line Items]
Number of bank branches	1
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 Bu47

Organization and Nature of Business and Summary of Significant Accounting Policies (Subsidiaries) (Details)	Jun. 30, 2014
ICD IV, LLC [Member]
Organization and Nature of Business [Line Items]
Ownership percentage of less than wholly owned consolidated subsidiaries	99.99%

Organization and Nature of Bu48

Organization and Nature of Business and Summary of Significant Accounting Policies (FHLB stock) (Details) - Federal Home Loan Bank stock [Member]	Dec. 31, 2016USD ($)
Schedule of Cost-method Investments [Line Items]
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 Bu49

Organization and Nature of Business and Summary of Significant Accounting Policies (Useful Lives) (Details) - Maximum [Member]	12 Months Ended
	Dec. 31, 2016
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 Bu50

Organization and Nature of Business and Summary of Significant Accounting Policies Organization and Nature of Business and Summary of Significant Accounting Policies (OREO) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other real estate owned, included in other assets	$ 0	$ 0

Organization and Nature of Bu51

Organization and Nature of Business and Summary of Significant Accounting Policies (Trust assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Trust assets	$ 251,767	$ 209,920

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 6,031	$ 5,813	$ 5,476	$ 5,696	$ 5,941	$ 5,426	$ 5,272	$ 5,103	$ 23,016	$ 21,742	$ 20,040
Weighted average common shares outstanding (shares)									16,117	16,050	16,004
Weighted average effect of restricted stock units outstanding (shares)									54	46	38
Diluted weighted average common shares outstanding (shares)									16,171	16,096	16,042
Basic earnings per common share	$ 0.37	$ 0.36	$ 0.34	$ 0.35	$ 0.37	$ 0.34	$ 0.33	$ 0.32	$ 1.43	$ 1.35	$ 1.25
Diluted earnings per common share	$ 0.37	$ 0.36	$ 0.34	$ 0.35	$ 0.37	$ 0.34	$ 0.33	$ 0.32	$ 1.42	$ 1.35	$ 1.25
Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation									102	140	0

Investment Securities Available

Investment Securities Available-for-Sale by Security Type (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost		$ 262,837	$ 320,598
Investment securities available for sale, gross unrealized gains		1,066	2,847
Investment securities available for sale, gross unrealized losses		(3,266)	(2,731)
Investment securities available for sale		260,637	320,714
U.S. government agencies and corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost		2,524	2,551
Investment securities available for sale, gross unrealized gains		69	141
Investment securities available for sale, gross unrealized losses		0	0
Investment securities available for sale		2,593	2,692
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost		64,551	71,431
Investment securities available for sale, gross unrealized gains		376	1,669
Investment securities available for sale, gross unrealized losses		(591)	(21)
Investment securities available for sale		64,336	73,079
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost	[1]	103,038	133,414
Investment securities available for sale, gross unrealized gains	[1]	255	491
Investment securities available for sale, gross unrealized losses	[1]	(1,343)	(1,290)
Investment securities available for sale	[1]	101,950	132,615
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost	[1]	80,614	101,299
Investment securities available for sale, gross unrealized gains	[1]	341	485
Investment securities available for sale, gross unrealized losses	[1]	(797)	(696)
Investment securities available for sale	[1]	80,158	101,088
Trust preferred security [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost		1,784	1,773
Investment securities available for sale, gross unrealized gains		0	0
Investment securities available for sale, gross unrealized losses		(534)	(668)
Investment securities available for sale		1,250	1,105
Corporate notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost		10,326
Investment securities available for sale, gross unrealized gains		25
Investment securities available for sale, gross unrealized losses		(1)
Investment securities available for sale		$ 10,350
Corporate notes and equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, amortized cost			10,130
Investment securities available for sale, gross unrealized gains			61
Investment securities available for sale, gross unrealized losses			(56)
Investment securities available for sale			$ 10,135
[1]	All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities guaranteed by GNMA or issued by FNMA and real estate mortgage investment conduits guaranteed by FHLMC or GNMA.

Investment securities Investmen

Investment securities Investment Securities Held-to-Maturity by Security Type (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 48,386	$ 51,259
Investment securities held to maturity, fair value	47,789	51,918
State and political subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	48,386	51,259
Investment securities held to maturity, gross unrealized gains	70	883
Investment securities held to maturity, gross unrealized losses	(667)	(224)
Investment securities held to maturity, fair value	$ 47,789	$ 51,918

Investment Securities Contractu

Investment Securities Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Securities Available for Sale, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, amortized cost	$ 6,027
Due after five years through ten years, amortized cost	38,274
Due after ten years, amortized cost	23,159
Subtotal before securities without single maturities, amortized cost	79,185
Collateralized mortgage obligations and mortgage-backed securities, amortized cost	183,652
Investment securities available for sale, amortized cost	262,837	$ 320,598
Due after one year through five years, amortized cost	11,725
Investment Securities Available for Sale, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less, fair value	6,101
Due after one year through five years, fair value	11,809
Due after five years through ten years, fair value	37,996
Due after ten years, fair value	22,623
Subtotal before securities without single maturities, fair value	78,529
Collateralized mortgage obligations and mortgage-backed securities, fair value	182,108
Investment securities available for sale, fair value	260,637	320,714
Investment Securities Held to Maturity, Debt Maturities, Net Carrying Amount [Abstract]
Due after one year through five years, amortized cost	486
Due after five years through ten years, amortized cost	19,370
Due after ten years, amortized cost	28,530
Investment securities held to maturity, amortized cost	48,386	51,259
Investment Securities Held to Maturity, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturity [Abstract]
Due after one year through five years, fair value	474
Due after five years through ten years, fair value	19,110
Due after ten years, fair value	28,205
Investment securities held to maturity, fair value	$ 47,789	$ 51,918

Investment Securities Detail of

Investment Securities Detail of Sale of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Proceeds from sales	$ 3,054	$ 16,946	$ 36,582
Gross gains on sales	66	54	1,050
Gross losses on sales	$ 0	$ 7	$ 827

Investment Securities Gross Unr

Investment Securities Gross Unrealized Losses - AFS (Details) $ in Thousands	Dec. 31, 2016USD ($)securities	Dec. 31, 2015USD ($)
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 172,394	$ 125,526
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(2,644)	(1,106)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	3,788	48,644
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(622)	(1,625)
Investment securities available for sale, total, continuous unrealized loss position, fair value	176,182	174,170
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	(3,266)	(2,731)
U.S. government agencies and corporations [Member]
Schedule of Available-for-sale Securities [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	0	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	0	0
Investment securities available for sale, total, continuous unrealized loss position, fair value	0	0
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	0	0
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	34,903	321
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(591)	(1)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	0	2,053
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	0	(20)
Investment securities available for sale, total, continuous unrealized loss position, fair value	34,903	2,374
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	(591)	(21)
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	75,771	53,043
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(1,255)	(449)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	2,538	38,286
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(88)	(841)
Investment securities available for sale, total, continuous unrealized loss position, fair value	78,309	91,329
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (1,343)	(1,290)
Investment securities available for sale in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	1
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 60,221	67,662
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(797)	(600)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	0	7,200
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	0	(96)
Investment securities available for sale, total, continuous unrealized loss position, fair value	60,221	74,862
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	(797)	(696)
Trust preferred security [Member]
Schedule of Available-for-sale Securities [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	1,250	1,105
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(534)	(668)
Investment securities available for sale, total, continuous unrealized loss position, fair value	1,250	1,105
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (534)	(668)
Investment securities available for sale in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	1
Corporate notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 1,499
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses	(1)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value	0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses	0
Investment securities available for sale, total, continuous unrealized loss position, fair value	1,499
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses	$ (1)
Corporate notes and equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale, continuous unrealized loss position, less than 12 months, fair value		4,500
Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses		(56)
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value		0
Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses		0
Investment securities available for sale, total, continuous unrealized loss position, fair value		4,500
Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses		$ (56)

Investment securities Investm58

Investment securities Investment Securities Gross Unrealized Losses - HTM (Details) - State and political subdivisions [Member] $ in Thousands	Dec. 31, 2016USD ($)securities	Dec. 31, 2015USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, continuous unrealized loss position, less than 12 months, fair value	$ 32,976	$ 2,832
Investment securities held to maturity, continuous unrealized loss position, less than 12 months, gross unrealized losses	(458)	(42)
Investment securities held to maturity, continuous unrealized loss position, 12 months or longer, fair value	3,968	7,341
Investment securities held to maturity, continuous unrealized loss position, 12 months or longer, gross unrealized losses	(209)	(182)
Investment securities held to maturity, total, continuous unrealized loss position, fair value	36,944	10,173
Investment securities held to maturity, total, continuous unrealized loss position, gross unrealized losses	$ (667)	$ (224)
Investment securities held to maturity in unrealized loss positions 12 months or longer, qualitative disclosure, number of positions | securities	11

Investment securities Investm59

Investment securities Investment Securities Other Narratives (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Securities pledged as collateral at amortized cost	$ 141,995	$ 78,553

Loans and Allowance for Loan 60

Loans and Allowance for Loan Losses Schedule of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans Receivable [Line Items]
Loans	$ 1,401,220	$ 1,247,749
Net unamortized fees and costs	(1,350)	(1,061)
Loans, net of unamortized fees and costs	1,399,870	1,246,688
Loans with fixed rates of interest	911,067	744,450
Loans with variable rates of interest	490,153	503,299
Commercial loan [Member]
Loans Receivable [Line Items]
Loans	334,014	349,051
Real Estate [Member]
Loans Receivable [Line Items]
Loans pledged as collateral	680,000	590,000
Construction, land and land development [Member]
Loans Receivable [Line Items]
Loans	205,610	174,602
1-4 family residential first mortgages [Member]
Loans Receivable [Line Items]
Loans	47,184	51,370
Home equity [Member]
Loans Receivable [Line Items]
Loans	18,057	21,749
Commercial real estate [Member]
Loans Receivable [Line Items]
Loans	788,000	644,176
Consumer and other loans [Member]
Loans Receivable [Line Items]
Loans	$ 8,355	$ 6,801

Loans and Allowance for Loan 61

Loans and Allowance for Loan Losses Schedule of Loan Transactions with Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Related Parties [Roll Forward]
Related party loans, due from related party, beginning of year	$ 138,706	$ 129,780
Related party loans, new loans	60,712	37,049
Related party loans, repayments	(7,721)	(28,123)
Related party loans, due from related party, end of year	$ 191,697	$ 138,706

Loans and Allowance for Loan 62

Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans (Details) $ in Thousands		Dec. 31, 2016USD ($)loans	Dec. 31, 2015USD ($)loans
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	$ 426	$ 693
Number of troubled debt restructured loans included in the nonaccrual category | loans		2	3
Troubled debt restructured loans included in the nonaccrual category		$ 426	$ 613
Commercial loan [Member]
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	91	102
Construction, land and land development [Member]
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	0	60
1-4 family residential first mortgages [Member]
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	0	86
Home equity [Member]
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	0	0
Commercial real estate [Member]
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	335	445
Consumer and other loans [Member]
Loans, Modifications [Line Items]
Troubled debt restructured loans	[1]	$ 0	$ 0
[1]	There were two TDR loans as of December 31, 2016 and three TDR loans as of December 31, 2015, with balances of $426 and $613, respectively, included in the nonaccrual category.

Loans and Allowance for Loan 63

Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loan Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)loans	Dec. 31, 2015USD ($)loans	Dec. 31, 2014USD ($)loans
Loans and Allowance for Loan Losses [Abstract]
Troubled debt restructured loan modifications, pre-modification recorded investment	$ 0	$ 149	$ 0
Troubled debt restructured loan modifications, post-modification recorded investment	$ 0	$ 149	$ 0
Troubled debt restructured loan modifications, number | loans	0	3	0

Loans and Allowance for Loan 64

Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans that Subsequently Defaulted (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Allowance for Loan Losses [Abstract]
Troubled debt restructured loans, subsequent default, recorded investment	$ 0	$ 110	$ 0

Loans and Allowance for Loan 65

Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without and Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	$ 519	$ 894
Impaired loans, with no related allowance, unpaid principal balance	519	1,505
Impaired loans, with related allowance, recorded investment	503	567
Impaired loans, with related allowance, unpaid principal balance	503	567
Impaired loans, recorded investment	1,022	1,461
Impaired loans, unpaid principal balance	1,022	2,072
Impaired loans, related allowance	503	567
Impaired loans, with no related allowance, average recorded investment	619	1,640	$ 1,704
Impaired loans, with no related allowance, interest income, accrual method	1	11	28
Impaired loans, with related allowance, average recorded investment	535	795	2,290
Impaired loans, with related allowance, interest income, accrual method	0	8	77
Impaired loans, average recorded investment	1,154	2,435	3,994
Impaired loans, interest income, accrual method	1	19	105
Impaired loans, interest lost on nonaccrual loans	72	128	136
Commercial loan [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	35	0
Impaired loans, with no related allowance, unpaid principal balance	35	0
Impaired loans, with related allowance, recorded investment	91	142
Impaired loans, with related allowance, unpaid principal balance	91	142
Impaired loans, recorded investment	126	142
Impaired loans, unpaid principal balance	126	142
Impaired loans, related allowance	91	142
Impaired loans, with no related allowance, average recorded investment	3	116	271
Impaired loans, with no related allowance, interest income, accrual method	0	0	0
Impaired loans, with related allowance, average recorded investment	127	204	544
Impaired loans, with related allowance, interest income, accrual method	0	2	11
Impaired loans, average recorded investment	130	320	815
Impaired loans, interest income, accrual method	0	2	11
Construction, land and land development [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	0	60
Impaired loans, with no related allowance, unpaid principal balance	0	663
Impaired loans, with related allowance, recorded investment	0	0
Impaired loans, with related allowance, unpaid principal balance	0	0
Impaired loans, recorded investment	0	60
Impaired loans, unpaid principal balance	0	663
Impaired loans, related allowance	0	0
Impaired loans, with no related allowance, average recorded investment	8	259	397
Impaired loans, with no related allowance, interest income, accrual method	0	10	15
Impaired loans, with related allowance, average recorded investment	0	190	1,423
Impaired loans, with related allowance, interest income, accrual method	0	6	66
Impaired loans, average recorded investment	8	449	1,820
Impaired loans, interest income, accrual method	0	16	81
1-4 family residential first mortgages [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	108	352
Impaired loans, with no related allowance, unpaid principal balance	108	360
Impaired loans, with related allowance, recorded investment	0	0
Impaired loans, with related allowance, unpaid principal balance	0	0
Impaired loans, recorded investment	108	352
Impaired loans, unpaid principal balance	108	360
Impaired loans, related allowance	0	0
Impaired loans, with no related allowance, average recorded investment	212	311	355
Impaired loans, with no related allowance, interest income, accrual method	1	1	7
Impaired loans, with related allowance, average recorded investment	0	0	144
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	212	311	499
Impaired loans, interest income, accrual method	1	1	7
Home equity [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	41	0
Impaired loans, with no related allowance, unpaid principal balance	41	0
Impaired loans, with related allowance, recorded investment	276	270
Impaired loans, with related allowance, unpaid principal balance	276	270
Impaired loans, recorded investment	317	270
Impaired loans, unpaid principal balance	317	270
Impaired loans, related allowance	276	270
Impaired loans, with no related allowance, average recorded investment	3	0	7
Impaired loans, with no related allowance, interest income, accrual method	0	0	0
Impaired loans, with related allowance, average recorded investment	263	237	125
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	266	237	132
Impaired loans, interest income, accrual method	0	0	0
Commercial real estate [Member]
Loans, Impaired [Line Items]
Impaired loans, with no related allowance, recorded investment	335	482
Impaired loans, with no related allowance, unpaid principal balance	335	482
Impaired loans, with related allowance, recorded investment	136	155
Impaired loans, with related allowance, unpaid principal balance	136	155
Impaired loans, recorded investment	471	637
Impaired loans, unpaid principal balance	471	637
Impaired loans, related allowance	136	155
Impaired loans, with no related allowance, average recorded investment	393	952	674
Impaired loans, with no related allowance, interest income, accrual method	0	0	6
Impaired loans, with related allowance, average recorded investment	145	164	54
Impaired loans, with related allowance, interest income, accrual method	0	0	0
Impaired loans, average recorded investment	538	1,116	728
Impaired loans, interest income, accrual method	0	0	6
Consumer and other loans [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	2	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	2	0
Impaired loans, interest income, accrual method	$ 0	$ 0	$ 0

Loans and Allowance for Loan 66

Loans and Allowance for Loan Losses Impaired Loans (Details) $ in Thousands	Dec. 31, 2016USD ($)Borrowers	Dec. 31, 2015Borrowers
Loans and Allowance for Loan Losses [Abstract]
Impaired loans, number of borrowers | Borrowers	10	13
Impaired loans also impaired at end of prior year, number of borrowers | Borrowers	7
Impaired loans also impaired at end of prior year | $	$ 946
Impaired loans, commitment to lend | $	$ 0

Loans and Allowance for Loan 67

Loans and Allowance for Loan Losses Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	$ 173	$ 356
Loans, recorded investment, current	1,400,025	1,246,012
Loans, recorded investment, nonaccrual status	1,022	1,381
Loans	1,401,220	1,247,749
Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	109	39
Loans, recorded investment, current	333,779	348,870
Loans, recorded investment, nonaccrual status	126	142
Loans	334,014	349,051
Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	205,610	174,602
Loans, recorded investment, nonaccrual status	0	0
Loans	205,610	174,602
1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	64	317
Loans, recorded investment, current	47,012	50,721
Loans, recorded investment, nonaccrual status	108	332
Loans	47,184	51,370
Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	17,740	21,479
Loans, recorded investment, nonaccrual status	317	270
Loans	18,057	21,749
Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	787,529	643,539
Loans, recorded investment, nonaccrual status	471	637
Loans	788,000	644,176
Consumer and other loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, recorded investment, current	8,355	6,801
Loans, recorded investment, nonaccrual status	0	0
Loans	8,355	6,801
Loans, 30 to 59 days past due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	173	318
Loans, 30 to 59 days past due [Member] | Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	109	1
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	64	317
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 loans [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	38
Loans, 60 to 89 days past due [Member] | Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	38
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	0
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 loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, equal to greater than 90 days past due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, equal to greater than 90 days past due [Member] | Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, equal to greater than 90 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, equal to greater than 90 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, equal to greater than 90 days past due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, equal to greater than 90 days past due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	0	0
Loans, equal to greater than 90 days past due [Member] | Consumer and other loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Loans, recorded investment, past due	$ 0	$ 0

Loans and Allowance for Loan 68

Loans and Allowance for Loan Losses Schedule of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans, Recorded Investment [Line Items]
Loans	$ 1,401,220	$ 1,247,749
Commercial loan [Member]
Loans, Recorded Investment [Line Items]
Loans	334,014	349,051
Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	205,610	174,602
1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	47,184	51,370
Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	18,057	21,749
Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	788,000	644,176
Consumer and other loans [Member]
Loans, Recorded Investment [Line Items]
Loans	8,355	6,801
Pass [Member]
Loans, Recorded Investment [Line Items]
Loans	1,375,227	1,216,193
Pass [Member] | Commercial loan [Member]
Loans, Recorded Investment [Line Items]
Loans	329,366	344,650
Pass [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	204,572	173,373
Pass [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	46,278	50,375
Pass [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	17,646	21,401
Pass [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	769,010	619,608
Pass [Member] | Consumer and other loans [Member]
Loans, Recorded Investment [Line Items]
Loans	8,355	6,786
Watch [Member]
Loans, Recorded Investment [Line Items]
Loans	22,493	26,498
Watch [Member] | Commercial loan [Member]
Loans, Recorded Investment [Line Items]
Loans	3,303	2,936
Watch [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Watch [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	798	517
Watch [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	0	68
Watch [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	18,392	22,977
Watch [Member] | Consumer and other loans [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Substandard [Member]
Loans, Recorded Investment [Line Items]
Loans	3,500	5,058
Substandard [Member] | Commercial loan [Member]
Loans, Recorded Investment [Line Items]
Loans	1,345	1,465
Substandard [Member] | Construction, land and land development [Member]
Loans, Recorded Investment [Line Items]
Loans	1,038	1,229
Substandard [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment [Line Items]
Loans	108	478
Substandard [Member] | Home Equity Loan [Member]
Loans, Recorded Investment [Line Items]
Loans	411	280
Substandard [Member] | Commercial real estate [Member]
Loans, Recorded Investment [Line Items]
Loans	598	1,591
Substandard [Member] | Consumer and other loans [Member]
Loans, Recorded Investment [Line Items]
Loans	0	15
Doubtful [Member]
Loans, Recorded Investment [Line Items]
Loans	0	0
Doubtful [Member] | Commercial loan [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 loans [Member]
Loans, Recorded Investment [Line Items]
Loans	$ 0	$ 0

Loans and Allowance for Loan 69

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					$ 14,967				$ 13,607	$ 14,967		$ 13,607		$ 13,791
Charge-offs										(406)		(439)		(1,217)
Recoveries										551		949		283
Provision for loan losses		$ 100	$ 200	$ 500	200	$ 450	$ 200	$ 200	0	1,000	[1]	850	[1]	750	[1]
Allowance for loan losses, ending balance		16,112				14,967				16,112		14,967		13,607
Commercial loan [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					4,369				4,415	4,369		4,415		4,199
Charge-offs										(125)		(408)		(836)
Recoveries										218		579		116
Provision for loan losses	[1]									(581)		(217)		936
Allowance for loan losses, ending balance		3,881				4,369				3,881		4,369		4,415
Construction, land and land development [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					2,338				2,151	2,338		2,151		3,032
Charge-offs										(141)		0		0
Recoveries										217		250		8
Provision for loan losses	[1]									225		(63)		(889)
Allowance for loan losses, ending balance		2,639				2,338				2,639		2,338		2,151
1-4 family residential first mortgages [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					508				466	508		466		613
Charge-offs										(93)		(23)		(131)
Recoveries										59		7		45
Provision for loan losses	[1]									(157)		58		(61)
Allowance for loan losses, ending balance		317				508				317		508		466
Home equity [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					481				534	481		534		403
Charge-offs										0		(2)		(138)
Recoveries										36		87		99
Provision for loan losses	[1]									(39)		(138)		170
Allowance for loan losses, ending balance		478				481				478		481		534
Commercial real estate [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					7,254				6,013	7,254		6,013		5,485
Charge-offs										0		0		(112)
Recoveries										13		12		11
Provision for loan losses	[1]									1,430		1,229		629
Allowance for loan losses, ending balance		8,697				7,254				8,697		7,254		6,013
Consumer and other loans [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning balance					$ 17				$ 28	17		28		59
Charge-offs										(47)		(6)		0
Recoveries										8		14		4
Provision for loan losses	[1]									122		(19)		(35)
Allowance for loan losses, ending balance		$ 100				$ 17				$ 100		$ 17		$ 28
[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.

Loans and Allowance for Loan 70

Loans and Allowance for Loan Losses Schedule of Allowance for Loan Losses Based on Impairment Method (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	$ 503	$ 567
Allowance for loan losses, collectively evaluated for impairment	15,609	14,400
Allowance for loan losses	16,112	14,967
Commercial loan [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	91	142
Allowance for loan losses, collectively evaluated for impairment	3,790	4,227
Allowance for loan losses	3,881	4,369
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	2,639	2,338
Allowance for loan losses	2,639	2,338
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	317	508
Allowance for loan losses	317	508
Home equity [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	276	270
Allowance for loan losses, collectively evaluated for impairment	202	211
Allowance for loan losses	478	481
Commercial real estate [Member]
Loans, Allowance for Credit Losses [Line Items]
Allowance for loan losses, individually evaluated for impairment	136	155
Allowance for loan losses, collectively evaluated for impairment	8,561	7,099
Allowance for loan losses	8,697	7,254
Consumer and other loans [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	100	17
Allowance for loan losses	$ 100	$ 17

Loans and Allowance for Loan 71

Loans and Allowance for Loan Losses Schedule of Loans by Impairment Method (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	$ 1,022	$ 1,461
Loans, collectively evaluated for impairment	1,400,198	1,246,288
Loans	1,401,220	1,247,749
Commercial loan [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	126	142
Loans, collectively evaluated for impairment	333,888	348,909
Loans	334,014	349,051
Construction, land and land development [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	0	60
Loans, collectively evaluated for impairment	205,610	174,542
Loans	205,610	174,602
1-4 family residential first mortgages [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	108	352
Loans, collectively evaluated for impairment	47,076	51,018
Loans	47,184	51,370
Home equity [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	317	270
Loans, collectively evaluated for impairment	17,740	21,479
Loans	18,057	21,749
Commercial real estate [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	471	637
Loans, collectively evaluated for impairment	787,529	643,539
Loans	788,000	644,176
Consumer and other loans [Member]
Loans, Allowance for Credit Losses [Line Items]
Loans, individually evaluated for impairment	0	0
Loans, collectively evaluated for impairment	8,355	6,801
Loans	$ 8,355	$ 6,801

Premises and Equipment, Net (De

Premises and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Premises and equipment [Line Items]
Premises and equipment, gross	$ 30,147	$ 17,582
Accumulated depreciation	6,833	6,020
Premises and equipment, net	23,314	11,562
Land [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	4,323	2,823
Buildings [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	14,344	5,305
Leasehold improvements [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	3,843	3,661
Furniture and equipment [Member]
Premises and equipment [Line Items]
Premises and equipment, gross	$ 7,637	$ 5,793

Deposits Deposits (Details)

Deposits Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Time deposit maturities, 2017	$ 67,142
Time deposit maturities, 2018	30,911
Time deposit maturities, 2019	11,425
Time deposit maturities, 2020	3,617
Time deposit maturities, 2021	2,919
Time deposits, total	116,014
CDARS deposits	53,821	$ 43,161
ICS Checking Deposits	83,089	73,639
ICS Money Market Deposits	$ 155,957	$ 87,556

Subordinated Notes (Details)

Subordinated Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jul. 18, 2003
Debt Instrument [Line Items]
Subordinated notes, net	$ 20,398,000	$ 20,385,000
Debt instrument, unamortized discount and debt issuance costs	$ (3,000)
Subordinated debt [Member]
Debt Instrument [Line Items]
Subordinated notes, net			$ 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	4.05%
Debt instrument, interest rate, effective percentage	4.11%
Debt instrument, unamortized discount and debt issuance costs	$ 221,000	$ 234,000
Debt instrument, frequency of periodic payment	quarterly
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%
Designated as Hedging Instrument [Member] | Interest Rate Swap due September 30, 2026 [Member] | Cash flow hedging [Member]
Debt Instrument [Line Items]
Derivative, notional amount	$ 20,000,000

Federal Home Loan Bank Advanc75

Federal Home Loan Bank Advances, Maturities Summary (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Federal Home Loan Bank advances		$ 105,000	$ 105,000
Discount for modification		(5,114)	(6,615)
Federal Home Loan Bank advances, net		99,886	98,385
Maturity date January 29, 2018 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Federal Home Loan Bank advances		$ 25,000	$ 25,000
Debt instrument, fixed rate period end		2.70%	2.70%
Debt instrument, interest rate, effective percentage	[1],[2]	2.70%	2.70%
Maturity date December 23, 2019 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Federal Home Loan Bank advances		$ 25,000	$ 25,000
Debt instrument, variable interest rate period end		1.28%	0.86%
Debt instrument, interest rate, effective percentage	[2]	3.26%	2.83%
Maturity date June 22, 2020 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Federal Home Loan Bank advances		$ 25,000	$ 25,000
Debt instrument, variable interest rate period end		1.30%	0.88%
Debt instrument, interest rate, effective percentage	[2]	3.45%	3.02%
Maturity date September 21, 2020 [Member]
Federal Home Loan Bank Advances Maturities Summary [Line Items]
Federal Home Loan Bank advances		$ 30,000	$ 30,000
Debt instrument, variable interest rate period end		1.30%	0.88%
Debt instrument, interest rate, effective percentage	[2]	4.44%	4.44%
[1]	Callable quarterly.
[2]	The effective interest rate for the variable rate advances includes the effects of the discount fee amortization and interest rate swaps.

Federal Home Loan Bank Advanc76

Federal Home Loan Bank Advances (Other Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 21, 2012
Line of Credit Facility [Line Items]
Federal Home Loan Bank Advances, modified				$ 80,000
Debt Instrument, Unamortized Discount, Gross				$ 11,152
Amortization of debt discount	$ 1,501	$ 1,497	$ 1,496
Federal Home Loan Bank advances	105,000	105,000
Short-term borrowings	0	19,000
Additional borrowing capacity, Federal Home Loan Bank advances	300,000
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
Maturity date September 21, 2020 [Member]
Line of Credit Facility [Line Items]
Federal Home Loan Bank advances	$ 30,000	$ 30,000

Long-term debt (Details)

Long-term debt (Details) - USD ($) $ in Thousands	Jun. 27, 2013	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2013
Debt Instrument [Line Items]
Debt instrument, gross		$ 5,129
Secured debt [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 16,000
Debt instrument, gross		$ 4,600	$ 7,800
Secured debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, increase to stated interest rate, default	5.00%
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		2.58%
Contract Payable [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 765
Debt instrument, interest rate, stated percentage				1.25%
Debt instrument, gross		$ 529	$ 615

Long-term debt Maturities of lo

Long-term debt Maturities of long-term debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-term Debt, Unclassified [Abstract]
Long-term debt, maturities, repayments of principal in next twelve months	$ 3,312
Long-term debt, maturities, repayments of principal in year two	1,514
Long-term debt, maturities, repayments of principal in year three	115
Long-term debt, maturities, repayments of principal in year four	116
Long-term debt, maturities, repayments of principal in year five	37
Long-term debt, maturities, repayments of principal after year five	35
Long-term debt, gross	5,129
Debt instrument, unamortized discount and debt issuance costs	(3)
Long-term debt, net	$ 5,126	$ 8,405

Derivatives Derivatives (Detail

Derivatives Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Swap due September 21 2020 [Member]
Derivatives, Fair Value [Line Items]
Cash pledged as collateral		$ 470	$ 740
Interest Rate Swap due September 30, 2026 [Member] | Counterparties [Member]
Derivatives, Fair Value [Line Items]
Cash pledged as collateral		$ 1,070	0
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
Derivative, weighted average receive rate		1.30%	0.88%
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		$ (496)	$ (774)
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
Derivative, weighted average receive rate		0.00%
Derivative, weighted average pay rate		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		$ 1,068
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 due September 21 2020 [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	$ 473

Derivatives Derivatives Pre-Tax

Derivatives 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, 2016	Dec. 31, 2015	Dec. 31, 2014
Other income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedge ineffectiveness, net	$ 0	$ 0	$ 0
Effective portion [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)	882	(1,144)	(3,759)
Effective portion [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated oci into income, effective portion, net	$ (573)	$ (160)	$ (83)

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current federal income tax expense									$ 8,220	$ 8,057	$ 4,838
Current state income tax expense									1,627	1,558	1,276
Deferred federal income tax expense									115	112	608
Deferred state income tax expense									(26)	(30)	(73)
Income tax expense	$ 2,687	$ 2,634	$ 2,381	$ 2,234	$ 2,596	$ 2,466	$ 2,361	$ 2,274	$ 9,936	$ 9,697	$ 6,649

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax reconciliation, income tax expense, at federal statutory income tax rate									$ 11,533	$ 11,004	$ 9,341
Effective income tax rate reconciliation, at federal statutory income tax rate									35.00%	35.00%	35.00%
Income tax reconciliation, state income taxes									$ 1,004	$ 957	$ 596
Effective income tax rate reconciliation, state income taxes									3.00%	3.00%	2.20%
Income tax reconciliation, tax exempt interest income, amount									$ (1,823)	$ (1,786)	$ (1,525)
Effective income rate tax reconciliation, tax exempt interest income, percent									(5.50%)	(5.70%)	(5.70%)
Income tax reconciliation, nondeductible interest expense to own tax-exempts									$ 58	$ 43	$ 42
Effective income tax rate reconciliation, nondeductible interest expense to own tax-exempts									0.20%	0.10%	0.20%
Income tax reconciliation, tax-exempt increase in cash value of life insurance and gains, amount									$ (381)	$ (254)	$ (256)
Effective income tax rate reconciliation, tax-exempt increase in cash value of life insurance and gains, percent									(1.20%)	(0.80%)	(1.00%)
Income tax reconciliation, capital loss carryforward, amount									$ 0	$ (130)	$ (1,318)
Effective income tax rate reconciliation capital loss carryforward, percent									(0.00%)	(0.40%)	(4.90%)
Income tax reconciliation, federal income tax credits									$ (405)	$ (275)	$ (160)
Effective income tax rate reconciliation, federal income tax credits									(1.20%)	(0.90%)	(0.60%)
Income tax reconciliation, other adjustments									$ (50)	$ 138	$ (71)
Effective income tax rate reconciliation, other adjustments									(0.10%)	0.50%	(0.30%)
Income tax expense	$ 2,687	$ 2,634	$ 2,381	$ 2,234	$ 2,596	$ 2,466	$ 2,361	$ 2,274	$ 9,936	$ 9,697	$ 6,649
Effective income tax rate									30.20%	30.80%	24.90%

Income Taxes Schedule of Deferr

Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred tax assets, allowance for loan losses	$ 6,123	$ 5,687
Deferred tax assets, unrealized losses on securities available for sale	719	0
Deferred tax assets, net unrealized losses on interest rate swap	0	473
Deferred tax assets, intangible assets	462	771
Deferred tax assets, accrued expenses	706	898
Deferred tax assets, restricted stock unit compensation	446	358
Deferred tax assets, state net operating loss carryforward	1,271	1,183
Deferred tax assets, capital loss carryforward	0	355
Deferred tax assets, other	190	34
Deferred tax assets, gross	9,917	9,759
Deferred tax liabilities, net deferred loan fees and costs	321	350
Deferred tax liabilities, net unrealized gains on securities available for sale	0	210
Deferred tax liabilities, net unrealized gains on interest rate swap	80	0
Deferred tax liabilities, premises and equipment	1,027	674
Deferred tax liabilities, other	261	317
Deferred tax liabilities, gross	1,689	1,551
Deferred tax assets, net, before valuation allowance	8,228	8,208
Valuation allowance	(1,271)	(1,538)
Deferred tax assets, net	$ 6,957	$ 6,670

Income Taxes Schedule of Operat

Income Taxes Schedule of Operating Loss Carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 21,185
Minimum [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards, expiration dates	Dec. 31, 2019

Income Taxes Schedule of Penalt

Income Taxes Schedule of Penalties and Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax interest and penalties included in accrued tax expense	$ 0	$ 0
Income tax interest and penalties recognized	$ 0	$ 0	$ 0

Income Taxes Schedule of Valuat

Income Taxes Schedule of Valuation Allowance Changes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Income Tax Disclosure [Abstract]
Valuation allowance, deferred tax asset, increase (decrease), amount	$ 267
Valuation allowance, deferred tax asset change, expiration of capital loss carryforwards	355
Valuation allowance deferred tax asset change, new net operating loss carryforwards	$ 88

Stock Compensation Plans Restri

Stock Compensation Plans Restricted Stock Unit Activity (Details) - West Bancorporation, Inc. 2012 Equity Incentive Plan [Member] - Restricted stock units (RSUs) [Member] - Common stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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)	261,833	179,699	130,337
Stock compensation plan, restricted stock, grants in period (number of shares)	141,000	139,500	104,750
Stock compensation plan, restricted stock, vested in period (number of shares)	(95,565)	(57,366)	(55,388)
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)	307,268	261,833	179,699
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)	$ 16.67	$ 13.39	$ 10.50
Stock compensation plan, restricted stock, grants in period, weighted average grant date fair value ($ per share)	18.44	19.59	15.30
Stock compensation plan, restricted stock, vested in period, weighted average grant date fair value ($ per share)	16.74	13.23	10.20
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)	$ 17.46	$ 16.67	$ 13.39

Stock Compensation Plans Narrat

Stock Compensation Plans Narratives (Details) - West Bancorporation, Inc. 2012 Equity Incentive Plan [Member] - Common stock [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	318,023	437,022
Restricted stock units (RSUs) [Member]
Stock compensation plan [Line Items]
Stock compensation plan, restricted stock, outstanding, weighted average remaining contractual terms	3 years
Projected forfeitures on restricted stock awards	0
Stock compensation plan, restricted stock, forfeited in period, shares	0
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	$ 1,730	$ 1,118	$ 818
Stock compensation expense	1,684	$ 1,166	$ 633
Stock compensation plan, restricted stock, nonvested awards, compensation not yet recognized	$ 3,656

Employee Savings and Stock Ow89

Employee Savings and Stock Ownership Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Expense, defined contribution plan, employer contributions	$ 1,023	$ 960	$ 964
Defined contribution plan, employer discretionary contribution percent	4.00%	4.00%	4.00%
Shares held in employee stock option plan, allocated	327,307	328,206
One Hundred Percent Matching Percentage [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent	6.00%	6.00%	6.00%

Common Stock Repurchase (Detail

Common Stock Repurchase (Details) - Common Stock [Member] $ in Thousands	4 Months Ended
	Apr. 21, 2016USD ($)shares
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount | $	$ 2,000
Stock repurchase program, number of shares repurchased | shares	0

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income, Changes [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	$ (430)
Total other comprehensive income (loss)	(612)	$ (684)	$ 3,792
Accumulated other comprehensive income (loss), balance end of period	(1,042)	(430)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income, Changes [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	(430)	254	(3,538)
Other comprehensive income (loss), before reclassifications, net of tax	(847)	(730)	3,887
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	235	46	(95)
Total other comprehensive income (loss)	(612)	(684)	3,792
Accumulated other comprehensive income (loss), balance end of period	(1,042)	(430)	254
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Noncredit-related Unrealized Gains Losses on Securities with OTTI [Member]
Accumulated Other Comprehensive Income, Changes [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	0	0	(1,439)
Other comprehensive income (loss), before reclassifications, net of tax	0	0	1,133
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	0	0	306
Total other comprehensive income (loss)	0	0	1,439
Accumulated other comprehensive income (loss), balance end of period	0	0	0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Unrealized gains losses on securities without OTTI, net of tax [Member]
Accumulated Other Comprehensive Income, Changes [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	342	416	(4,217)
Other comprehensive income (loss), before reclassifications, net of tax	(1,394)	(21)	5,085
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	(120)	(53)	(452)
Total other comprehensive income (loss)	(1,514)	(74)	4,633
Accumulated other comprehensive income (loss), balance end of period	(1,172)	342	416
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income, Changes [Roll Forward]
Accumulated other comprehensive income (loss), balance beg of period	(772)	(162)	2,118
Other comprehensive income (loss), before reclassifications, net of tax	547	(709)	(2,331)
Amounts reclassified from accumulated other comprehensive income, current period, net of tax	355	99	51
Total other comprehensive income (loss)	902	(610)	(2,280)
Accumulated other comprehensive income (loss), balance end of period	$ 130	$ (772)	$ (162)

Regulatory Capital Requiremen92

Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 202,530	$ 187,790
Capital to risk weighted assets	11.87%	12.12%
Capital required for capital adequacy	$ 147,108	$ 123,979
Capital required for capital adequacy to risk weighted assets	8.625%	8.00%
Tier one risk based capital	$ 186,418	$ 172,807
Tier one risk based capital to risk weighted assets	10.93%	11.15%
Tier one risk based capital required for capital adequacy	$ 112,996	$ 92,984
Tier one risk based capital required for capital adequacy to risk weighted assets	6.625%	6.00%
Common equity tier one capital	$ 166,418	$ 152,807
Common equity tier one capital to risk weighted assets	9.76%	9.86%
Common equity tier one capital required for capital adequacy	$ 87,412	$ 69,738
Common equity tier one capital required for capital adequacy to risk weighted assets	5.125%	4.50%
Tier one leverage capital	$ 186,418	$ 172,807
Tier one leverage capital to average assets	10.14%	9.91%
Tier one leverage capital required for capital adequacy	$ 73,530	$ 69,764
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tangible capital to tangible assets	8.92%	8.71%
Intangible assets	$ 0	$ 0
West Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 186,118	$ 174,450
Capital to risk weighted assets	11.04%	11.32%
Capital required for capital adequacy	$ 145,414	$ 123,279
Capital required for capital adequacy to risk weighted assets	8.625%	8.00%
Capital required to be well capitalized	$ 168,597	$ 154,099
Capital required to be well capitalized to risk weighted assets	10.00%	10.00%
Tier one risk based capital	$ 170,006	$ 159,467
Tier one risk based capital to risk weighted assets	10.08%	10.35%
Tier one risk based capital required for capital adequacy	$ 111,695	$ 92,460
Tier one risk based capital required for capital adequacy to risk weighted assets	6.625%	6.00%
Tier one risk based capital required to be well capitalized	$ 134,877	$ 123,279
Tier one risk based capital required to be well capitalized to risk weighted assets	8.00%	8.00%
Common equity tier one capital	$ 170,006	$ 159,467
Common equity tier one capital to risk weighted assets	10.08%	10.35%
Common equity tier one capital required for capital adequacy	$ 86,406	$ 69,345
Common equity tier one capital required for capital adequacy to risk weighted assets	5.125%	4.50%
Common equity tier one capital required to be well capitalized	$ 109,588	$ 100,164
Common equity tier one capital required to be well capitalized to risk weighted assets	6.50%	6.50%
Tier one leverage capital	$ 170,006	$ 159,467
Tier one leverage capital to average assets	9.34%	9.20%
Tier one leverage capital required for capital adequacy	$ 72,807	$ 69,352
Tier one leverage capital required for capital adequacy to average assets	4.00%	4.00%
Tier one leverage capital required to be well capitalized	$ 91,009	$ 86,690
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, 2016	Dec. 31, 2015	Dec. 31, 2014
Leases, Operating [Abstract]
Operating leases, rent expense	$ 1,293	$ 1,741	$ 1,823

Commitments and Contingencies M

Commitments and Contingencies Minimum Rental Commitments (Details) $ in Thousands	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating leases, future estimated minimum payments due, 2017	$ 1,392
Operating leases, future estimated minimum payments due, 2018	1,400
Operating leases, future estimated minimum payments due, 2019	1,402
Operating leases, future estimated minimum payments due, 2020	1,402
Operating leases, future estimated minimum payments due, 2021	1,347
Operating leases, future estimated minimum payments due, thereafter	6,461
Operating leases, total future estimated minimum payments due	$ 13,404

Commitments and Contingencies95

Commitments and Contingencies Required Reserve Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Subsidiaries [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Required cash reserve balances, Federal Reserve Bank	$ 6,393	$ 4,579

Commitments and Contingencies C

Commitments and Contingencies Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	$ 620,168	$ 567,353
Commitments to extend credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	614,681	558,633
Standby letters of credit [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	5,487	$ 8,720
Home equity [Member] | Commitments to extend credit [Member] | Commitments to extend credit, expiration within ten years [Member]
Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan commitments	$ 12,168

Commitments and Contingencies O

Commitments and Contingencies Other Narratives (Details) $ in Thousands	Dec. 31, 2016USD ($)Number_of_states	Dec. 31, 2015USD ($)
Loss Contingencies [Line Items]
Present value of credit enhancement fees	$ 218
FHLB MPF program remaining outstanding balance of loans sold	112,084	$ 139,152
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value	$ 0	$ 0
States other than Iowa [Member] | State and political subdivisions [Member]
Loss Contingencies [Line Items]
Investment securities, number of states, debt securities | Number_of_states	17
State of Iowa [Member] | State and political subdivisions [Member]
Loss Contingencies [Line Items]
Investment securities, single state concentration, percent of balance of state and political subdivision securities	40.00%

Commitments and Contingencies98

Commitments and Contingencies Contractual commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Affordable Housing Project Investment [Member]
Long-term Purchase Commitment [Line Items]
Contractual obligation	$ 5,768	$ 4,292

Fair Value Measurements Recurri

Fair Value Measurements Recurring Basis by Level (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale		$ 260,637	$ 320,714
Fair value, inputs, level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps, derivative asset		1,068	0
Interest rate swaps, derivative liability		496	774
Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Interest rate swaps, derivative asset		1,068
Interest rate swaps, derivative liability		496	774
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
Interest rate swaps, derivative liability		0	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		1,068
Interest rate swaps, derivative liability		496	774
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
Interest rate swaps, derivative liability		0	0
U.S. government agencies and corporations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale		2,593	2,692
U.S. government agencies and corporations [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale		2,593	2,692
U.S. government agencies and corporations [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
U.S. government agencies and corporations [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		2,593	2,692
U.S. government agencies and corporations [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
State and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale		64,336	73,079
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		64,336	73,079
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		64,336	73,079
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	[1]	101,950	132,615
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		101,950	132,615
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		101,950	132,615
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	[1]	80,158	101,088
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		80,158	101,088
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		80,158	101,088
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
Trust preferred security [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale		1,250	1,105
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		1,250	1,105
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		1,250	1,105
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		10,350
Corporate notes [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale		10,350
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		10,050
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		300
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
Corporate notes and equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale			10,135
Corporate notes and equity securities [Member] | Fair value, measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment securities available for sale			10,135
Corporate notes and equity 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			9,835
Corporate notes and equity 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			300
Corporate notes and equity 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
[1]	All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities guaranteed by GNMA or issued by FNMA and real estate mortgage investment conduits guaranteed by FHLMC or GNMA.

Fair Value Measurements Change

Fair Value Measurements Change in Level 3 Securities (Details) - Fair value, inputs, level 3 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 1,850
Transfers into level 3	0
Total gains or (losses):
Included in earnings	(493)
Included in other comprehensive income	2,321
Sale of security	(3,593)
Principal payments	(85)
Balance, end of period	$ 0

Fair Value Measurements Nonrecu

Fair Value Measurements Nonrecurring Basis by Level (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
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	$ 98

Fair Value Measurements Carryin

Fair Value Measurements Carrying Amounts and Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 40,943	$ 57,329
Federal funds sold	35,893	15,322
Investment securities available for sale	260,637	320,714
Investment securities held to maturity	48,386	51,259
Federal Home Loan Bank stock	10,771	12,447
Loans, net	1,383,758	1,231,721
Accrued interest receivable	5,321	4,688
Deposits	1,546,605	1,440,729
Federal funds purchased	9,690	2,760
Short-term borrowings	0	19,000
Federal Home Loan Bank advances	105,000	105,000
Long-term debt, net	5,126	8,405
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available for sale	260,637	320,714
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	40,943	57,329
Federal funds sold	35,893	15,322
Federal Home Loan Bank stock	10,771	12,447
Accrued interest receivable	5,321	4,688
Federal funds purchased	9,690	2,760
Short-term borrowings	0	19,000
Accrued interest payable	280	343
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	40,943	57,329
Federal funds sold	35,893	15,322
Federal Home Loan Bank stock	10,771	12,447
Accrued interest receivable	5,321	4,688
Federal funds purchased	9,690	2,760
Short-term borrowings	0	19,000
Accrued interest payable	280	343
Fair value, inputs, level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps, derivative asset	1,068	0
Interest rate swaps, derivative liability	496	774
Fair value, inputs, level 2 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities held to maturity	48,386	51,259
Loans, net	1,383,758	1,231,623
Interest rate swaps, derivative asset	1,068	0
Deposits	1,546,605	1,440,729
Subordinated notes, net	20,398	20,385
Federal Home Loan Bank advances	99,886	98,385
Long-term debt, net	5,126	8,405
Interest rate swaps, derivative liability	496	774
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	47,789	51,918
Loans, net	1,382,569	1,235,238
Deposits	1,546,307	1,440,762
Subordinated notes, net	12,703	11,674
Federal Home Loan Bank advances	99,959	98,812
Long-term debt, net	5,054	8,314
Fair value, inputs, level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	0	98
Fair value, inputs, level 3 [Member] | Estimate of fair value, fair value disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans, net	0	98
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, 2016	Dec. 31, 2015
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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Premises, net	$ 23,314	$ 11,562
Other assets	5,113	3,850
Total assets	1,854,204	1,748,396
LIABILITIES
Accrued expenses and other liabilities	7,123	6,355
Long-term debt, net	5,126	8,405
Total liabilities	1,688,828	1,596,019
STOCKHOLDERS' EQUITY
Preferred stock	0	0
Common stock	3,000	3,000
Additional paid-in capital	21,462	20,067
Retained earnings	141,956	129,740
Accumulated other comprehensive income (loss)	(1,042)	(430)
Total stockholders' equity	165,376	152,377	$ 140,175	$ 123,625
Total liabilities and stockholders' equity	1,854,204	1,748,396
Parent Company [Member]
ASSETS
Cash	3,945	13,775	$ 8,792	$ 6,705
Investment in West Bank	168,302	159,038
Investment in West Bancorporation Capital Trust I	619	619
Premises, net	18,194	7,898
Other assets	1,256	111
Total assets	192,316	181,441
LIABILITIES
Accrued expenses and other liabilities	1,416	274
Subordinated notes, net	20,398	20,385
Long-term debt, net	5,126	8,405
Total liabilities	26,940	29,064
STOCKHOLDERS' EQUITY
Preferred stock	0	0
Common stock	3,000	3,000
Additional paid-in capital	21,462	20,067
Retained earnings	141,956	129,740
Accumulated other comprehensive income (loss)	(1,042)	(430)
Total stockholders' equity	165,376	152,377
Total liabilities and stockholders' equity	$ 192,316	$ 181,441

Condensed Statements of Income-

Condensed Statements of Income- Parent Company Only (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Income
Gain on disposition of premises									$ (4)	$ (6)	$ 1,069
Operating Expenses [Abstract]
Interest on subordinated notes									728	705	754
Interest on long-term debt									145	232	297
Occupancy									4,033	4,105	4,165
Other real estate owned									0	10	1,865
Income tax benefits	$ 2,687	$ 2,634	$ 2,381	$ 2,234	$ 2,596	$ 2,466	$ 2,361	$ 2,274	9,936	9,697	6,649
Net income	$ 6,031	$ 5,813	$ 5,476	$ 5,696	$ 5,941	$ 5,426	$ 5,272	$ 5,103	23,016	21,742	20,040
Parent Company [Member]
Operating Income
Equity in net income of West Bank									23,544	22,546	19,773
Equity in net income of West Bancorporation Capital Trust I									23	21	21
Gain on disposition of premises									0	0	1,627
Realized investment securities loss									0	0	(493)
Intercompany rental income									503	207	126
Other rental income									50	43	0
Total operating income									24,120	22,817	21,054
Operating Expenses [Abstract]
Interest on subordinated notes									728	705	753
Interest on long-term debt									145	232	297
Occupancy									280	170	78
Other real estate owned									0	10	1,725
Other expenses									443	486	604
Total operating expenses									1,596	1,603	3,457
Income before income taxes									22,524	21,214	17,597
Income tax benefits									(492)	(528)	(2,443)
Net income									$ 23,016	$ 21,742	$ 20,040

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 6,031	$ 5,813	$ 5,476	$ 5,696	$ 5,941	$ 5,426	$ 5,272	$ 5,103	$ 23,016	$ 21,742	$ 20,040
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									1,046	921	853
Gain on disposition of premises									4	6	(1,069)
Write-down of other real estate owned									0	0	1,786
Deferred income tax (benefits)									89	82	535
Change in assets and liabilities:
(Increase) decrease in other assets									(89)	2,945	(448)
Increase (decrease) in accrued expenses and other liabilities									1,047	(196)	(476)
Cash Flows from Investing Activities:
Proceeds from paydown on securities available for sale									58,358	49,665	56,450
Purchases of premises									(12,802)	(2,502)	(5,298)
Proceeds from sales of other real estate owned									0	2,227	2,103
Proceeds from settlement of other assets									0	3,593	0
Cash Flows from Financing Activities:
Principal payments on long-term debt									(3,286)	(4,261)	(3,260)
Common stock cash dividends									(10,800)	(9,952)	(7,842)
Cash:
Transfer of investment securities to other assets, sale not settled									0	0	3,593
Parent Company [Member]
Cash Flows from Operating Activities:
Net income									23,016	21,742	20,040
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net income of West Bank									(23,544)	(22,546)	(19,773)
Equity in net income of West Bancorporation Capital Trust I									(23)	(21)	(21)
Dividends received from West Bank									14,400	13,900	12,700
Dividends received from West Bancorporation Capital Trust I									23	21	21
Realized investment securities loss									0	0	493
Amortization									20	23	26
Depreciation									244	139	39
Gain on disposition of premises									0	0	(1,627)
Write-down of other real estate owned									0	0	1,681
Loss on sale of other real estate owned									0	8	10
Deferred income tax (benefits)									97	99	362
Change in assets and liabilities:
(Increase) decrease in other assets									(79)	1,428	(1,248)
Increase (decrease) in accrued expenses and other liabilities									641	(31)	(32)
Net cash provided by operating activities									14,795	14,762	12,671
Cash Flows from Investing Activities:
Proceeds from paydown on securities available for sale									0	0	85
Proceeds from sale of premises									0	0	3,000
Purchases of premises									(10,539)	(1,386)	(4,097)
Proceeds from sales of other real estate owned									0	2,227	1,530
Proceeds from settlement of other assets									0	3,593	0
Net cash provided by (used in) investing activities									(10,539)	4,434	518
Cash Flows from Financing Activities:
Principal payments on long-term debt									(3,286)	(4,261)	(3,260)
Common stock cash dividends									(10,800)	(9,952)	(7,842)
Net cash provided by (used in) financing activities									(14,086)	(14,213)	(11,102)
Net increase (decrease) in cash									(9,830)	4,983	2,087
Cash:
Beginning				$ 13,775				$ 8,792	13,775	8,792	6,705
Ending	$ 3,945				$ 13,775				3,945	13,775	8,792
Transfer of investment securities to other assets, sale not settled									$ 0	$ 0	$ 3,593

Selected Quarterly Financial107

Selected Quarterly Financial Data (unaudited) Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Interest income	$ 16,565	$ 16,696	$ 16,209	$ 15,524	$ 15,660	$ 15,147	$ 14,819	$ 14,521	$ 64,994		$ 60,147		$ 55,301
Interest expense	2,140	1,975	1,936	1,825	1,529	1,441	1,465	1,558	7,876		5,993		6,156
Net interest income	14,425	14,721	14,273	13,699	14,131	13,706	13,354	12,963	57,118		54,154		49,145
Provision for loan losses	100	200	500	200	450	200	200	0	1,000	[1]	850	[1]	750	[1]
Net interest income after provision for loan losses	14,325	14,521	13,773	13,499	13,681	13,506	13,154	12,963	56,118		53,304		48,395
Noninterest income	1,930	1,919	1,903	2,230	2,486	1,935	1,922	1,860	7,982		8,203		10,296
Noninterest expense	7,537	7,993	7,819	7,799	7,630	7,549	7,443	7,446	31,148		30,068		32,002
Income before income taxes	8,718	8,447	7,857	7,930	8,537	7,892	7,633	7,377	32,952		31,439		26,689
Income taxes	2,687	2,634	2,381	2,234	2,596	2,466	2,361	2,274	9,936		9,697		6,649
Net income	$ 6,031	$ 5,813	$ 5,476	$ 5,696	$ 5,941	$ 5,426	$ 5,272	$ 5,103	$ 23,016		$ 21,742		$ 20,040
Basic earnings per common share	$ 0.37	$ 0.36	$ 0.34	$ 0.35	$ 0.37	$ 0.34	$ 0.33	$ 0.32	$ 1.43		$ 1.35		$ 1.25
Diluted earnings per common share	$ 0.37	$ 0.36	$ 0.34	$ 0.35	$ 0.37	$ 0.34	$ 0.33	$ 0.32	$ 1.42		$ 1.35		$ 1.25
[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.