Southwest Bancorp (OKSB) 10-K 9 Mar 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Mar. 09, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	SOUTHWEST BANCORP INC
Entity Central Index Key	914,374
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Trading Symbol	oksb
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 297
Entity Common Stock, Shares Outstanding		18,689,022
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes

Consolidated Statements Of Fina

Consolidated Statements Of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Cash and due from banks	$ 36,831	$ 24,971
Interest-bearing deposits	38,819	53,158
Cash and cash equivalents	75,650	78,129
Securities held to maturity (fair values of $10,677 and $12,282, respectively)	10,443	11,797
Securities available for sale (amortized cost of $427,113 and $401,136, respectively)	426,218	400,331
Loans held for sale	4,386	7,453
Loans receivable	1,872,746	1,771,976
Less: Allowance for loan losses	(27,546)	(26,106)
Net loans receivable	1,845,200	1,745,870
Accrued interest receivable	6,194	5,767
Non-hedge derivative asset	1,235	1,793
Premises and equipment, net	22,808	23,819
Other real estate	350	2,274
Goodwill	13,545	13,467
Other intangible assets, net	5,790	6,615
Bank owned life insurance	28,575	27,676
Other assets	34,998	32,031
Total assets	2,475,392	2,357,022
Deposits:
Noninterest-bearing demand	551,709	596,494
Interest-bearing demand	152,656	151,015
Money market accounts	567,058	534,357
Savings accounts	56,410	56,333
Time deposits of $100,000 or more	360,307	311,538
Other time deposits	257,878	234,368
Total deposits	1,946,018	1,884,105
Accrued interest payable	1,132	867
Non-hedge derivative liability	1,235	1,793
Other liabilities	10,171	11,684
Other borrowings	183,814	110,927
Subordinated debentures	46,393	51,548
Total liabilities	2,188,763	2,060,924
Shareholders' equity:
Common stock - $1 par value; 40,000,000 shares authorized; 21,230,714 and 21,138,028 shares issued, respectively	21,231	21,138
Additional paid in capital	123,112	121,966
Retained earnings	184,840	173,210
Accumulated other comprehensive loss	(907)	(1,290)
Treasury stock, at cost; 2,555,987 and 1,131,226 shares, respectively	(41,647)	(18,926)
Total shareholders' equity	286,629	296,098
Total liabilities & shareholders' equity	$ 2,475,392	$ 2,357,022

Consolidated Statements Of Fin3

Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Financial Condition [Abstract]
Held to maturity securities, fair value	$ 10,677	$ 12,282
Available for sale securities, amortized cost	$ 427,113	$ 401,136
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,230,714	21,138,028
Treasury Stock, Shares	2,555,987	1,131,226

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Interest and fees on loans	$ 81,527	$ 67,644	$ 64,224
Investment securities:
U.S. Government and agency obligations	1,104	1,186	1,490
Mortgage-backed securities	3,845	3,326	3,459
State and political subdivisions	1,383	1,212	1,171
Other securities	1,075	835	1,026
Other interest-earning assets	206	280	422
Total interest income	89,140	74,483	71,792
Interest expense:
Interest-bearing demand	243	153	146
Money market accounts	1,391	830	620
Savings accounts	74	44	38
Time deposits of $100,000 or more	2,031	910	1,428
Other time deposits	2,229	1,861	1,423
Other borrowings	1,379	984	900
Subordinated debentures	2,350	2,284	2,233
Total interest expense	9,697	7,066	6,788
Net interest income	79,443	67,417	65,004
Provision (credit) for loan losses	4,769	(3,566)	(6,624)
Net interest income after provision (credit) for loan losses	74,674	70,983	71,628
Noninterest income:
Service charges and fees	10,558	9,995	10,222
Other noninterest income	2,561	2,121	898
Gain on sale of bank branches, net			4,378
Gain on sales of mortgage loans, net	2,672	2,179	1,549
Gain on sales/calls of investment securities, net	294	162	1,884
Total noninterest income	16,085	14,457	18,931
Noninterest expense:
Salaries and employee benefits	37,724	34,850	31,830
Occupancy	11,059	9,359	9,193
Data processing	1,886	2,178	1,776
FDIC and other insurance	1,376	1,353	1,305
Other real estate, net	(222)	161	594
Provision for Other Losses	130	(255)	(380)
Provision (credit) for unfunded loan commitments	2,500	2,400
General and administrative	11,293	10,594	12,594
Total noninterest expense	63,246	58,240	56,912
Income before taxes	27,513	27,200	33,647
Taxes on income	9,809	9,793	12,617
Net income	17,704	17,407	21,030
Net income available to common shareholders	$ 17,704	$ 17,407	$ 21,030
Basic earnings per common share	$ 0.93	$ 0.90	$ 1.07
Diluted earnings per common share	0.92	0.90	1.06
Common dividends declared per share	$ 0.32	$ 0.24	$ 0.16

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 17,704	$ 17,407	$ 21,030
Other comprehensive income:
Unrealized gain (loss) on available for sale securities	204	(1,599)	5,784
Reclassification adjustment for net gains arising during the period	(294)	(162)	(1,884)
Change in fair value of derivative used for cash flow hedge	715	216	381
Other comprehensive income (loss), before tax	625	(1,545)	4,281
Tax (expense) benefit related to items of other comprehensive income (loss)	(242)	650	(1,665)
Other comprehensive income (loss), net of tax	383	(895)	2,616
Comprehensive income	$ 18,087	$ 16,512	$ 23,646

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net income	$ 17,704,000	$ 17,407,000	$ 21,030,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (credit) for loan losses	4,769,000	(3,566,000)	(6,624,000)
Adjustments to other real estate		63,000	576,000
Deferred tax expense	556,000	2,116,000	9,180,000
Asset depreciation	2,814,000	2,468,000	2,829,000
Securities premium amortization, net of discount accretion	3,724,000	2,658,000	2,624,000
Amortization of intangibles	1,901,000	1,085,000	780,000
Goodwill impairment	0	0	0
Restricted stock amortization expense	769,000	1,139,000	210,000
Net gain on sales/calls of investment securities	(294,000)	(162,000)	(1,884,000)
Net gain on sales of mortgage loans	(2,672,000)	(2,179,000)	(1,549,000)
Net (gain) loss on sales of premises/equipment	99,000	(16,000)	19,000
Net (gain) loss on sales of other real estate	(275,000)	123,000	(200,000)
Net gain from sale of bank branches			(4,378,000)
Bank owned life insurance	(899,000)	(523,000)
Proceeds from sales of held for sale loans	126,459,000	105,648,000	83,258,000
Held for sale loans originated for resale	(120,909,000)	(110,161,000)	(75,887,000)
Net changes in assets and liabilities:
Accrued interest receivable	(427,000)	(254,000)	311,000
Other assets	(5,130,000)	(1,886,000)	(4,152,000)
Excess tax expense from share-based payment arrangements			(2,000)
Accrued interest payable	265,000	57,000	(76,000)
Other liabilities	(1,473,000)	915,000	638,000
Net cash provided by operating activities	26,981,000	14,932,000	26,703,000
Investing activities:
Proceeds from sales of available for sale securities	43,593,000		1,419,000
Held to maturity securities	1,650,000	2,060,000	2,250,000
Available for sale securities	86,691,000	98,904,000	79,282,000
Redemptions of other investments			696,000
Purchases of held to maturity securities	(444,000)	(1,629,000)	(1,725,000)
Purchases of available for sale securities	(159,542,000)	(115,710,000)	(51,344,000)
Purchases of bank owned life insurance		(20,000,000)
Loans originated, net of principal repayments	(104,262,000)	(169,426,000)	(166,971,000)
Cash outflows from sale of bank branches, net			(94,806,000)
Cash received in business combinations, net of cash paid		12,284,000
Purchases of premises and equipment	(2,078,000)	(2,177,000)	(2,096,000)
Proceeds from sales of premises and equipment	176,000	76,000	99,000
Proceeds from sales of other real estate	2,681,000	1,185,000	1,401,000
Net cash used in investing activities	(131,535,000)	(194,433,000)	(231,795,000)
Financing activities:
Net increase in deposits	61,913,000	104,876,000	80,488,000
Net increase (decrease) in other borrowings	72,887,000	24,367,000	(1,253,000)
Net proceeds from issuance of common stock	1,239,000	682,000	385,000
Purchases of treasury stock	(22,721,000)	(8,624,000)	(10,302,000)
Redemption of trust preferred securities	(5,155,000)
Excess tax expense from share-based payment arrangements			2,000
Common stock dividends paid	(6,088,000)	(4,607,000)	(3,131,000)
Net cash provided by financing activities	102,075,000	116,694,000	66,189,000
Net decrease in cash and cash equivalents	(2,479,000)	(62,807,000)	(138,903,000)
Cash and cash equivalents:
Beginning of period	78,129,000	140,936,000	279,839,000
End of period	$ 75,650,000	$ 78,129,000	$ 140,936,000

Consolidated Statement Of Share

Consolidated Statement Of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Gain/(Loss) [Member]	Treasury Stock [Member]	Total
Beginning balance, Shares at Dec. 31, 2013	19,732,926
Beginning balance at Dec. 31, 2013	$ 19,733	$ 99,937	$ 142,528	$ (3,011)		$ 259,187
Dividends declared:
Common			(3,131)			(3,131)
Net common stock issued under employee plans and related tax expense	$ 78	1,308				1,386
Net common stock issued under employee plans and related tax expense, shares	77,951
Other comprehensive income (loss), net of tax				2,616		2,616
Treasury shares purchased					$ (10,302)	(10,302)
Treasury shares purchased, shares	(617,818)
Net income			21,030			21,030
Ending balance, Shares at Dec. 31, 2014	19,193,059
Ending balance at Dec. 31, 2014	$ 19,811	101,245	160,427	(395)	(10,302)	270,786
Dividends declared:
Common			(4,624)			(4,624)
Stock issued for Bancshares acquisition	$ 1,214	20,152				21,366
Stock issued for Bancshares acquisition, shares	1,213,985
Net common stock issued under employee plans and related tax expense	$ 113	569				682
Net common stock issued under employee plans and related tax expense, shares	113,166
Other comprehensive income (loss), net of tax				(895)		(895)
Treasury shares purchased					(8,624)	(8,624)
Treasury shares purchased, shares	(513,408)
Net income			17,407			17,407
Ending balance, Shares at Dec. 31, 2015	20,006,802
Ending balance at Dec. 31, 2015	$ 21,138	121,966	173,210	(1,290)	(18,926)	296,098
Dividends declared:
Common			(6,074)			(6,074)
Net common stock issued under employee plans and related tax expense	$ 93	1,146				1,239
Net common stock issued under employee plans and related tax expense, shares	92,686
Other comprehensive income (loss), net of tax				383		383
Treasury shares purchased					(22,721)	(22,721)
Treasury shares purchased, shares	(1,424,761)
Net income			17,704			17,704
Ending balance, Shares at Dec. 31, 2016	18,674,727
Ending balance at Dec. 31, 2016	$ 21,231	$ 123,112	$ 184,840	$ (907)	$ (41,647)	$ 286,629

Consolidated Statement of Shar8

Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statement Of Shareholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.32	$ 0.24	$ 0.16

Summary of Significant Accounti

Summary of Significant Accounting And Reporting Policies	12 Months Ended
	Dec. 31, 2016
Significant Accounting And Reporting Policies [Abstract]
Significant Accounting And Reporting Policies	 SOUTHWEST BANCORP, INC. Notes to the Consolidated Financial Statements For the Years Ended Decem ber 31, 2016, 2015 and 2014  Note 1: Summary of Significant Accounting and Reporting Policies  Organization and Nature of Operations – Southwest Bancorp Inc. (“we”, “our”, “us”, or “Southwest”), incorporated in 1981, is a financial holding company headquartered in Stillwater, Oklahoma engaged primarily in commercial and retail financial services in the states of Oklahoma, Texas, Kansas , and Colorado . The accompanying consolidated financial statements include the accounts of Bank SNB, an Oklahoma banking corporation established in 1894, and the consol idated subsidiaries of Bank SNB . Bank SNB is a w holly owned, direct subsidiary of ours. All significant intercompany balances and transactions have been eliminated in consolidation.  On October 9, 2015, we completed the acquisition of Bancshares through the m erger of Bancshares with and into us. The Bancshares Merger was consummated pursuant to the Bancshares Merger Agreement dated as of May 27, 2015. The Bancshares Merger expanded our presence in the Oklahoma City metro ar ea with five additional banking centers , increasing o ur total to ten . It also expanded our geographic footprint to Colorado with three full-service banking centers and one loan production office in Denver.  Basis of Presentation – The accounting and reporting policies conform to accounting principles generally accepted in the United States and to generally accepted practices within the banking industry. The Consolidated Financial Statements include the accounts of Southwest and all other entities in which we have a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation.  Certain reclassifications have been made to prior year amounts on the Consolidated Statements of Operations to conform to current year presentation.  We have evaluated subsequent events for potential recognition and disclosure through the issue date of the Consolidated Financial Statements included in this Annual Report on Form 10-K.  Management Estimates – In preparing our financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilitie s as of the dates shown on the Consolidated Statements of Financial C ondition and revenues and expenses during the periods reported. Actual results could differ significantly from those estimates. Changes in economic conditions could affect the determination of material estimates such as the allowance for loan losses, the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, income taxes, and the fair value of financial instruments.  Cash and Cash Equivalents – For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from depository institutions, and federal funds sold. Interest-bearing balances held at depository institutions were $ 38.8 million at December 31, 2016 and $ 53.2 million at December 31, 2015. Federal funds sold are sold for one-to-four day periods.  C ash paid for interest totaled $ 9.7 million i n 201 6 , $ 7.0 million in 201 5 , and $ 6.9 million in 201 4 . Cash paid for income taxes totale d $ 9.4 million in 2016, $ 7.1 million in 2015, and $ 4.0 million in 2014. Noncash transactions included stock issued for the acquisition of Bancshares of $21.4 million in 2015 and transfer of loans to other real estate t otaling $ 0.5 million in 2016 and $ 0.3 million in 2015 and $2.2 million in 2014.  Bank SNB is required by the FRB to maintain average reserve balances. Cash and cash equivalents in the Consolidated Statements of Financial Condition include restricted amounts of $ 1.0 million and $ 7.0 million at December 31, 201 6 and December 31, 201 5 , respectively.  Investment Securities – Investments in debt and equity securities are identified as held to maturity or available for sale based on management considerations of asset/liability strategy, changes in interest rates and prepayment risk, the need to increase liquidity, and other factors, including management’s intent and ability to hold securities to maturity. We have the ability and intent to hold to maturity our investment securities classified as held to maturity. We had no investments held for trading purposes for any period presented. Under certain circumstances (including the deterioration of the issuer’s creditworthiness, a change in tax law, or statutory or regulatory requirements), we may change the investment security classification. The classifications we utilize determine the related accounting treatment for each category of investments. Available for sale securities are accounted for at fair value with unrealized gains or losses, net of taxes, excluded from operations and reported as accumulated other comprehensive income or loss. Held to maturity securities are accounted for at amortized cost. Securities with limited marketability, such as FRB stock, FHLB stock, and certain other investments, are carried at cost and included in other assets.  All investment securities are adjusted for amortization of premiums and accretion of discounts. Amortization of premiums and accretion of discounts are recorded to operations over the contractual maturity or estimated life of the individual investment using the level yield method. Gain or loss on sale of investments is based upon the specific identification method. Income earned on our investments in state and political subdivisions generally is not subject to ordinary Federal income tax.  In accordance with authoritative accounting guidance under ASC 320, Debt and Equity Securities , declines in fair value of held-to-maturity and available-for-sale securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. Under this guidance, we evaluate investment securities for other-than-temporary impairment on at least a quarterly basis, or more frequently when economic or market conditions warrant such an evaluation.  Federal Reserve Bank and Federal Home Loan Bank Stock – Bank SNB is a m ember of its regional FRB and FHLB system. FHLB members are required to own a certain amount of stock based on the level of borrowings a nd other factors, and may invest in additional accounts. Both FRB and FHLB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income. Loans – Interest on loans is accrued and credited to operations based upon the principal amount outstanding. Loan origination fees and certain costs of originated loans are amortized as an adjustment to the yield over the term of the loan. Net unamortized deferred loan fees wer e $ 2.5 million at December 31, 201 6 and $1.5 million at 201 5 . Loans are reported at the principal balance outstanding net of the unamortized deferred loan fees.  In general, our policy for nonaccrual loans requires that accrued interest income on nonaccrual loans is written off after the loan is 90 days past due, and that subsequent interest income is recorded when cash receipts are received from the borrower. We identify past due loans based on contractual terms on a loan by loan basis.  A loan is considered to be impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. The allowance for loan losses related to loans that are evaluated for impairment is based either on the discounted cash flows using the loan’s initial effective interest rate or on the fair value of the collateral for certain collateral dependent loans. Smaller balance, homogeneous loans, including mortgage, and consumer, are collectively evaluated for impairment. This evaluation is inherently subjective as it requires material estimates including the amounts and timing of future cash flows expected to be received on impaired loans that may be susceptible to significant change.  Loans Held for Sale -- We originate real estate mortgage loans for either portfolio investment or sale in the secondary market. During the period of origination, real estate mortgage loans are designated as held either for investment purposes or sale. Mortgage loans held for sale are generally sold within a one-month period from loan closing at amounts determined by the investor commitment based upon the pricing of the loan.  Loans Acquired through Business Combination with Deteriorated Credit Quality – The accounting guidance of ASC 310.30, Loan and Debt Securities Acquired with Deteriorated Credit Quality , applies to loans acquired in a business combination that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that we will be unable to collect all contractually required payment receivables. In accordance with this guidance, these loans are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield”, is recognized as interest inc ome over the life of the loan using a method that approximates the level-yield method. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acqui sition, or the “nonaccretable difference”, are not recognized as a yield adjustment, a loss accrual, or a valuation allowance. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairments. Valuation allowances on these impaired loans reflect only losses incurred after the acquisition.  Allowance for Loan Losses – The allowance for loan losses is a reserve established through a provision for loan losses charged to operations. Loan amounts which are determined to be uncollectible are charged against this allowance, and recoveries, if any, are added to the allowance. The appropriate amount of the allowance is based on continuous review and evaluation of the loan portfolio and ongoing, quarterly assessments of the probable losses inherent in the loan portfolio. The allowance for loan losses is determined in accordance with regulatory guidelines and generally accepted accounting principles and is comprised of two primary components, specific and general. Allocations of the allowance for loan losses may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off.  The specific component relates to loans that are individually classified as impaired. Loans deemed to be impaired are evaluated on an individual basis consistent with ASC 310.10.35, Receivables: Subsequent Measurement . The amount and level of the impairment allowance is ultimately determined by management’s estimate of the amount of expected future cash flows or, if the loan is collateral dependent, on the value of the collateral, which may vary from period to period depending on changes in the financial condition of the borrower or changes in the estimated value of the collateral. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and deemed as impaired, and classified as nonperforming, potential problem, or performing restructured as applicable. Charge-offs against the allowance for impaired loans are made when and to the extent the loan is deemed uncollectible.  The general component of the allowance is calculated based on ASC 450, Contingencies . Loans not evaluated for specific allowance are segmented into loan pools by type of loan. The commercial real estate and real estate construction pools are further segmented by the market in which the loan collateral is located. Our primary markets are Oklahoma, Texas, Kansas , and Colorado , and loans secured by real estate in those states are included in the “in-market” pool, with the remaining defaulting to the “out-of-market” pool. Estimated allowances are based on historical loss trends with adjustments factored in based on qualitative risk factors both internal and external to us. The historical loss trend is determined by loan pool and segmentation and is based on the actual loss history experienced by us over the most recent three years. The qualitative risk factors include, but are not limited to, economic and business conditions, changes in lending staff, lending policies and procedures, quality of loan review, changes in the nature and volume of the portfolios, loss and recovery trends, asset quality trends, and legal and regulatory considerations.  Independent appraisals on real estate collateral securing loans are obtained at origination. New appraisals are obtained periodically and upon discovery of factors that may significantly affect the value of the collateral. Appraisals usually are received within 30 days of request. Results of appraisals on nonperforming and potential problem loans are reviewed promptly upon receipt and also are reviewed monthly and considered in the determination of the allowance for loan losses. We are not aware of any significant time lapses in the process that have resulted, or would result in, a significant delay in determination of a credit weakness, the identification of a loan as nonperforming, or the measurement of an impairment.  Management strives to carefully monitor credit quality and to identify loans that may become nonperforming. At any time, however, there are loans included in the portfolio that will result in losses but that have not been identified as nonperforming or potential problem loans. Because the loan portfolio contains a significant number of commercial and commercial real estate loans with relatively large balances, the unexpected deterioration of one or a few of such loans may cause a significant increase in nonperforming assets and may lead to a material increase in charge-offs and the provision for loan losses in future periods.  Liability for Credit Losses on Unfunded Loan Commitments – Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.  The reserve for unfunded loan commitments is a liability on our C onsolidated S tatement s of F inancial C ondition in other liabilities. The reserve is computed using a methodology similar to that used to determine the allowance for loan losses, modified t o take into account the probability of a drawdown on the commitment. At December 31, 201 6 and 201 5, the balance s were $ 2.5 mill ion and $2.4 million, respectively .  Premises and Equipment – Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are recorded on a straight-line basis over the estimated useful life of each asset. Useful liv es range from 10 years to 40 years for buildings and improvements, and 3 years to 10 years for furniture, fixtures, and equipment. We review the carrying value of long-lived assets used in operations when changes in events or circumstances indicate that the assets might have become impaired. If circumstances required, the review would initially include a comparison of carrying value to the undiscounted cash flows estimated to be generated by those assets. If this review indicates that an asset is impaired, we would record a charge to operations to reduce the asset’s carrying value to fair value, which is based on estimated discounted cash flows. Long-lived assets that are held for disposal are valued at the lower of the carrying amount or fair value less costs to sell.  Other Real Estate – Assets acquired through or instead of loan foreclosure are considered other real estate. Other real estate is initially recorded at the lesser of the carrying value or fair value less the estimated costs to sell the asset. Write-downs of carrying value required at the time of foreclosure are recorded as a charge to the allowance for loan losses. Costs related to the development of such real estate are capitalized, and costs related to holding the property are expensed. Foreclosed property is subject to periodic revaluation based upon estimates of fair value. In determining the valuation of other real estate, management obtains independent appraisals for significant properties. Valuation adjustments are provided, as necessary, by charges to operations. Profits and losses from operations or sales of foreclosed property are recognized as incurred . At December 31, 201 6 and 201 5 , the balances of other real estate w ere $ 0 . 4 m illion and $ 2.3 million, respectively.  Goodwill and Other Intangible Assets – Intangible assets consist of goodwill, core deposit intangibles, and loan servicing rights. Goodwill and core deposit intangibles, which generally result from a business combination, are accounted for under the provisions of ASC 350, Intangibles - Goodwill and Other , and ASC 805, Business Combinations. Loan servicing rights are accounted for under the provisions of ASC 860, Transfers and Servicing .  Goodwill represents the excess of the cost of businesses acquired over the fair value of the net assets acquired and is assigned to reporting units. Goodwill is not amortized, but is tested for impairment at least annually or more frequently if conditions indicate impairment may exist . The evaluation of possible impairment involves significant judgment based upon short-term and long-term projections of future performance of each reporting unit.  Core deposit intangibles are amortized using an economic life method based on deposit attrition. As a result, amortization will decline over time with most of the amortization occurring during the initial years. The net book value of core deposit intangibles is adjusted for applicable branch sales, if any, and is evaluated for impairment when economic conditions indicate impairment may exist.  When real estate mortgage loans and other loans are sold with servicing retained, an intangible servicing right is initially capitalized based on estimated fair value at the point of origination with the income statement effect recorded in gains on sales of loans. The servicing rights are amortized over the period of estimated net servicing income. Impairment of loan servicing rights is assessed based on the fair value of those rights. We review the carrying value of loan servicing rights quarterly for impairment. At least annually, we obtain estimates of fair value from outside sources to corroborate the results of the valuation model. At December 31, 201 6 and 201 5 , the fair values of loan servicing rights were $4.2 million and $ 3.7 mi llion , respectively .  Fair Value Measurements – ASC 820, Fair Value Measurements , defines fair value, establishes a framework for measuring fair value in accordance with generally accepted accounting principles, and expands disclosures about fair value measurements. In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parame ters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and our creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time.  Derivative Financial Instruments – Our derivative credit risk policy and our hedging policy permits the use of various derivative financial instruments to manage interest rate risk or to hedge specified assets and liabilities. All derivatives are recorded at fair value on our balance sheet.  To qualify for hedge accounting, derivatives must be highly effective at reducing the risk associated with the exposure being hedged and must be designated as a hedge at the inception of the derivative contract. We consider a hedge to be highly effective if the change in fair value of the derivative hedging instrument is within 80 % to 125 % of the opposite change in the fair value of the hedged item attributable to the hedged risk. If derivative instruments are designated as hedges of fair values, and such hedges are highly effective, both the change in the fair value of the hedge and the hedged item are included in current earnings. Fair value adjustments related to cash flow hedges are recorded in other comprehensive income and are reclassified to earnings when the hedged transaction is reflected in earnings. Ineffective portions of hedges are reflected in earnings as they occur. Actual cash receipts and/or payments and related accruals on derivatives related to hedges are recorded as adjustments to the interest income or interest expense associated with the hedged item. During the life of the hedge, we will formally assess whether derivatives designated as hedging instruments continue to be highly effective in offsetting changes in the fair value or cash flows of hedged items. If it is determined that a hedge has ceased to be highly effective, we will discontinue hedge accounting prospectively. At such time, previous adjustments to the carrying value of the hedged item are reversed into current earnings and the derivative instrument is reclassified to a trading position recorded at fair value.  Our qualified customers have the opportunity to participate in our interest rate swap program for the purpose of managing interest rate risk on their variable rate loans with us. If we enter into such agreements with customers, then offsetting agreements are executed between us and approved dealer counterparties to minimize our market risk from changes in interest rates. The counterparty contracts are identical to customer contracts in terms of notional amounts, interest rates, and maturity dates , except for a fixed pricing spread or fee paid to us by the dealer counterparty. These interest rate swaps carry varying degrees of credit, interest rate and market or liquidity risks. The fair value of such derivative instruments are recognized as either non-hedge derivative assets or liabilities in the Consolidated Statements of Financial C ondition.  Loan Servicing Income – We earn fees for servicing real estate mortgages and other loans owned by others. These fees are generally calculated on the outstanding principal balance of the loans serviced and are recorded as income when earned.  Taxes on Income – We file consolidated income tax returns with our subsidiaries. Income tax expense is the total of the current year income tax due or refundable, adjusted for permanent differences between items reported in the financial statements and those reported for tax purposes and the change in deferred tax assets and liabilities. Under the asset and liability method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statements and tax basis of assets and liabilities using the enacted tax rates in effect for the year in which the differences are expected to reverse. The net deferred tax asset is reflected as a co mponent of other assets on the C onsolidated Statements of Financial Condition .  A valuation allowance, if needed, reduces deferred tax assets to the expected amount most likely to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. We recognize net deferred tax assets to the extent that we believe these assets are more likely than not to be realized. In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and result s of recent operations. Management reviewed all evidence and concluded that a valuation allowance was not needed. Earnings per Common Share – ASC 260 , Earnings Per Share , provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share pursuant to the two-class method. We ha ve determined that our unvested restricted stock awards are participating securities. Accordingly, earnings per common share is computed using the two-class method prescribed by ASC 260. Using this method, basic earnings per common share is computed based upon net income available to common shareholders divided by the weighted average number of common shares outstanding during each period, which exclude the outstanding unvested restricted stock. Diluted earnings per share is computed using the weighted average number of common shares determined for the basic earnings per common share computation plus the dilutive effect of restricted stock awards using the treasury stock me thod. Restricted stock awards , where the exercise price was greater than the average market price of common shares, were not included in the computation of earnings per diluted share as they would have been ant i-dilutive. At December 31, 2016 and 2015, there were 6,573 and 38,145 anti-dilutive restricted stock awards outstanding , respectively.  A reconciliation of the weighted-average common shares used in the calculations of basic and diluted earnings per common share for the reported periods is provided at “ Note 1 5: Earnings per Common Share ” on page 86 .  Share-Based Compensation – The Southwest Bancorp, Inc. 2008 Stock Based Award Plan (the “2008 Stock Plan”), provides selected key employees with the opportunity to acquire common stock through stock options or restricted stock awards. Compensation cost is recognized based on the fair value of these awards at the date of grant. The exercise price of all options granted under the 2008 Stock Plan is the fair market value on the grant date, while the market price of our common stock at the date of grant is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. Depending upon terms of the stock option agreements, stock options generally become exercisable on an annual basis and expire from five to ten years after the date of grant.  The 2008 Stock Plan authorized awards for up to 800,000 shares of our common stock over its ten -year term.  Comprehensive Income – Our comprehensive income (net income plus all other changes in shareholders’ equity from non-equity sources) consists of our net income, the after tax effect of changes in the net unrealized gains (losses) in our available for sale securities, reclassification adjustments for net (gains) losses, and changes in the accumulated gain (loss) on the effective cash flow hedging instrument.  Simmons First National Corporation (Pending Merger) – On December 14, 2016, we entered into a Merger Agreement with Simmons, an Arkansas corporation, pursuant to which, and subject to its terms and conditions, Simmons will acquire all of our outstanding capital stock for $95.0 million in cash and 7,250,000 shares of Simmons’s common stock, representing an aggregate Merger consideration of approximately $564.4 million (based on Simmons’ common stock closing price as of December 13, 2016), subject to potential adjustments.  Simmons conducts banking operations through 150 financial centers located in communities throughout Arkansas, Kansas, Missouri and Tennessee. As of December 31, 2016, Simmons had $8.4 billion in total assets, $5.6 billion in loans and $6.7 billion in deposits. The completion of the Merger is subject to, among other things, regulatory and shareholder approval and other customary closing conditions.  

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2016
Acquisitions [Abstract]
Acquisitions	N ote 2: A cquisitions  On October 9, 2015, we completed the acquisition of Bancshares, through the merger of Bancshares with and into us. The Bancshares Merger was consummated pursuant to the Bancshares Merger Agreement dated as of May 27, 2015. The Bancshares Merger expanded our presence in the Oklahoma City metro area with five additional banking centers, increasing our total to ten . It also expanded our geographic footprint to Colorado with three full-service banking centers and one loan production office in Denver.  Under the t erms of the Bancshares Merger Agreement, at the effective time of the Bancshares Merger, all outstanding shares of Bancshares common stock were converted into the right to receive an aggregate merger consideration of $41. 8 million, 51% pa id in shares of our common stock, representing an aggregate 1,213,985 shares of our common stock, plus cash in lieu of any fractional shares, and 49% pa id in cash in an aggregate amount equal to $20.4 million.  The Bancshares Merger added $ 301.5 million in assets, $2 02.4 million in loans, $245. 2 million in deposits, $12.3 million in goodwill, and $2.7 million in core deposit intangible.  In connection with the Bancshares Merger, First Commercial Bank was merged with and into Bank SN B, with Bank SNB the surviving b ank, and all systems, products, and services were successfully integrated to our platform.  The following is a reconciliation of cash received from the acquisition of Bancshares as of the acquisition date:        (Dollars in thousands)  Fair value of assets acquired $ 301,499  Liabilities assumed (259,718)  Net assets acquired 41,781  Stock issued as consideration (21,366)  Cash acquired (32,699)  Cash received in business combination, net of cash paid $ (12,284)  The acquisition of the net assets of Bancshares consti tutes a business combination as defined by the FASB ASC Topic 805, Business Combinations. Accordingly, the assets acquired and liabilities assumed are presented at their fair values as required. Fair values were determined based on the requirements of FASB ASC Topic 820, Fair Value Measurements. In many cases, the determination of these fair values required management to make estimates about discount rates, future expected cash flows, market conditions and other future events that are highly subjective in nature and subject to change. The following schedule is a breakdown of the assets acquired and liabilities assumed as of the acquisition date:     First Commercial Bancshares, Inc.  Acquired from Bancshares Fair Value Adjustments Fair Value  (Dollars in thousands)  Assets, Acquired  Cash and due from banks $ 5,874 $ - $ 5,874  Interest-bearing deposits with other banks 17,196 - 17,196  Federal funds sold 9,629 - 9,629  Cash and cash equivalents 32,699 - 32,699  Investment securities 34,762 (184) 34,578  Loans 210,223 (7,790) 202,433  Allowance for loan losses 4,298 (4,298) -  Total loans receivable 205,925 (3,492) 202,433  Bank premises and equipment, net 4,241 1,341 5,582  Cash value of life insurance 7,153 - 7,153  Accrued interest receivable 790 - 790  Deferred tax asset 1,650 15 1,665  Core deposit intangible 55 2,646 2,701  Other assets 1,644 - 1,644  Total assets acquired $ 288,919 $ 326 $ 289,245   Liabilities, Assumed  Deposits  Demand and non-interest bearing $ 101,464 $ - $ 101,464  Savings and interest-bearing transaction accounts 59,356 - 59,356  Time deposits 84,410 - 84,410  Total Deposits 245,230 - 245,230  Other borrowings 7,180 - 7,180  Accrued interest payable and other liabilities 1,833 320 2,153  Subordinated debentures 5,155 - 5,155  Total liabilities assumed 259,398 320 259,718   Equity  Equity 31,158 (31,158) -  Total equity assumed 31,158 (31,158) -   Total liabilities and equity assumed $ 290,556 $ (30,838) $ 259,718   Net assets acquired 29,527  Purchase price 41,781  Goodwill $ 12,254  The following is a description of the methods used to determine the fair values of sig nificant assets and liabilities presented above:  Cash and due from banks, interest-bearing deposits with other banks and federal funds sold – The carrying amount of these assets is a reasonable estimate of fair value based on the short-term nature of these assets.  Investment securities – Investment securities were acquired from Bancshares with a $0.2 million adjustment to market value based upon quoted market prices or other observable inputs .  Loans – Fair values for loans were based on a discounted cash flow methodology th at considered factors including the type of loan and related collateral, classification status, fixed or variable interest ra te, term of loan and whether or not the loan was amortizing, and current discount rates. The discount rates used for lo ans are based on current market rates for new originations of comparable loans and include adjustments for liquidity concerns.  We evaluated $200.0 million of the loans purchased in conjunction wit h the acquisition in accordance with the provisions of FASB ASC Topic 310-20, Nonrefundable Fees and Other Costs, and those loans were recorded with a $4.5 million discount. As a result, the fair value discount on these loans is being accreted into interest income over the weighted average life of the loans using a constant yield method. The remaining $7.8 mil lion of loans evaluated were considered purchased credit impaired loans within the provisions of FASB ASC Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality, and were recorded with a $3.3 million discount. These purchase d credit impaired loans will recognize interest income through accretion of the difference between the carrying amount of the loans and the expected cash flows.  Bank premises and equipment – Bank buildings and land were acquired with an adjustment to fair value . Other bank premises and equipment were acquired at the carrying amount of the assets.  Cash value of life insurance – Cash value of life insurance was acquired at market value.  Accrued interest receivable – Accrued interest receivable was acquired at market value.  Deferred tax asset – The current and deferred income tax assets and liabilities are recorded to reflect the differences in the carrying values of the acquired assets and assumed liabilities for financial reporting purposes and the cost basis for federal income tax purposes, at our estimated federal income tax rate of 36.00% .  Goodwill – The consideration paid as a result of the acquisition exceeded the fair value of the net assets acquired; therefore, the Company recorded $12. 3 million of goodwill. Goodwill established prior to the acquisition was written off.  Core deposit intangible – This intangible asset represents the value of the relation ships that Bancshares had with its deposit customers. The fair value of this intangible asset was estimated based on a discounted cash flow methodology that gave appropriate consideration to expected customer attrition rates, cost of the deposit base, and the net maintenance cost attributable to customer deposits. The Company recorded $ 2.7 million of gross core deposit intangible.  Other assets – Other assets were acquired at carrying value, which approximates market value.  Deposits – The fair values used for the demand and savings deposits that co mprise the transaction accounts acquired, by definition equal the amount payable on demand at the acquisition date. No fair value adjustment was applied for time deposits because the weighted average interest rate of B ancshare ’s certificates of deposits were at the market rates for similar fun ding at the time of acquisition  Other borrowing s – The fair value of other borrowings is estimated based on borrowing rates currently available to us for borrowings with similar terms and maturities.  Accrued interest payable and other liabilities – The fair value used represents the adjustment of certain estimated liabilities from B ancshares .   Subordinated debentures – Subordinated debentures were acquired at carrying value, which approximates market value.  The following unaudited pro forma condensed financial information presents our results of operations, including the effects of the purchase accounting adjustments and acquisition expenses, had the acquisition taken place at the beginning of the period presented :    For the year ended December 31,  2015(1) 2014  (Dollars in thousands except per share data)  Interest income $ 84,399 $ 84,710  Interest expense 8,049 8,236  Net interest income 76,350 76,474   Provision for loan losses (3,080) (6,398)   Non-interest income 16,292 21,439  Non-interest expense (2) 68,860 67,779  Income before taxes 26,862 36,532  Income taxes 9,601 13,646  Net income 17,261 22,886   Earnings allocated to participating securities (258) (253)  Numerator for earnings per common share $ 17,003 $ 22,633   Earnings per share:  Basic $ 0.90 $ 1.10  Diluted 0.89 1.09   Basic weighted average shares outstanding 18,975,450 20,631,471  Diluted weighted average shares outstanding 19,129,533 20,774,348  ( 1 ) Subsequent to the Bancshares M erger date, activity related to Bancshares contributed pre-tax revenues of $2.9 million and incurred pre-tax expenses of $1.2 million, resulting in $1.1 million total contribution to our net income. We incurred pre-tax non-recurring expenses totaling $1.9 million, including: $0.5 million in personnel related expenses, $0.4 million in data processing expenses, $0.5 million in legal, accounting and investment banker expenses, and $0.5 million in marketing and other expenses.  (2) The 2015 pro forma non-interest expense is adjusted to exclude $2.5 million of pre-tax non-recurring expenses incurred by Bancshares prior to the Bancshares Merger date attributed to the following: $0.7 million in employee related expenses, $0.4 million in legal expenses, and $1.4 million to discount a loan pursuant to a provision of the Bancshares Merger Agreement.  Acquired Loans . Changes in the carrying amounts and accretable yields for all ASC 310.30 loans were as follows for the year ended December 31, 2016 and 2015 .    For the year ended December 31,  2016 2015  Carrying Carrying  Accretable amount Accretable amount  (Dollars in thousands) Yield of loans Yield of loans  Balance at beginning of period $ 807 $ 7,914 $ 540 $ 4,971  Acquisition - - (11) 4,396  Payments received - (2,964) 1 (1,814)  Transfers to other real estate / repossessed assets - - 541 -  Net charge-offs (11) (318) - (81)  Net reclassifications to / from nonaccretable amount - - 240 -  Accretion (166) - (504) 442  Balance at end of period $ 630 $ 4,632 $ 807 $ 7,914  

Disposals

Disposals	12 Months Ended
	Dec. 31, 2016
Disposals [Abstract]
Disposals	N ote 3: D isposals  During the second quarter of 2014, we sold a banking center in Overland Park , Kansas, to Fidelity Bank in Wichita, Kansas, and banking centers in Anthony and Harper, Kansas, to BancCentral, National Association, in Al va, Oklahoma. The sold banking centers had combined total deposits of $130.6 million and loans of $27.9 million.  These transactions resulted in a net gain of $4.4 million, which is included under noninterest income in the g ain on sale of bank branches, ne t as a separate line item on the C onsolidated Statements of O perations.  During 2016, we closed a banking center in Colorado Springs, Colorado, a banking center in Fort Worth, Texas, and a banking center in Frisco, Texas. We incurred $0.4 million in restructuring charges due to the banking center closures. 

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
Investment Securities [Abstract]
Investment Securities	 Note 4 : Investment Securities  A summary of the amortized cost and fair values of investment securities follows:      Amortized Gross Unrealized Fair  (Dollars in thousands) Cost Gains Losses Value  At December 31, 2016  Held to Maturity:  Obligations of state and political subdivisions $ 10,443 $ 242 $ (8) $ 10,677  Total $ 10,443 $ 242 $ (8) $ 10,677   Available for Sale:  Federal agency securities $ 69,691 $ 201 $ (198) $ 69,694  Obligations of state and political subdivisions 46,105 461 (191) 46,375  Residential mortgage-backed securities 282,035 573 (1,966) 280,642  Asset-backed securities 9,265 - (88) 9,177  Corporate debt 20,017 385 (72) 20,330  Total $ 427,113 $ 1,620 $ (2,515) $ 426,218   At December 31, 2015  Held to Maturity:  Obligations of state and political subdivisions $ 11,797 $ 488 $ (3) $ 12,282  Total $ 11,797 $ 488 $ (3) $ 12,282   Available for Sale:  Federal agency securities $ 78,363 $ 220 $ (373) $ 78,210  Obligations of state and political subdivisions 47,079 620 (134) 47,565  Residential mortgage-backed securities 240,804 936 (1,852) 239,888  Asset-backed securities 9,639 - (224) 9,415  Corporate debt 25,251 148 (146) 25,253  Total $ 401,136 $ 1,924 $ (2,729) $ 400,331 Residential mortgage-backed securities consist of agency securities underwritten and guaranteed by Government National Mor tgage Association , Federal Home Loan Mort gage Corporation , and Federal National Mortga ge Association .  Securities with limited marketability, such as FRB stock, F HLB stock, and certain other investments, are carried at cost and included in other assets on our Consolidated Statements of Financial Condition. Total investments carried at cost were $ 14.6 million and $ 10.4 milli on at December 31, 201 6 and 201 5 , respectively. There are no identified events or changes in circumstances that may have a significant adverse effect on the investments carried at cost. A comparison of the amortized cost and approximate fair value of our investment securities by maturity date at December 31, 201 6 follows:     Available for Sale Held to Maturity  Amortized Fair Amortized Fair  (Dollars in thousands) Cost Value Cost Value  One year or less $ 7,702 $ 7,747 $ - $ -  More than one year through five years 309,028 308,505 9,298 9,535  More than five years through ten years 76,505 75,976 1,145 1,142  More than ten years 33,878 33,990 - -  Total $ 427,113 $ 426,218 $ 10,443 $ 10,677 The foregoing analysis assumes that our residential mortgage-backed securities mature during the period in which they are estimated to prepay. No other prepayment or repricing assumptions have been applied to our investment securities for this analysis. Gain or loss on sale of investments is based upon the specific identification method. Sales of securities available for sale are as follows:    (Dollars in thousands) 2016 2015 2014  Proceeds from sales $ 43,593 $ 162 $ 2,545  Gross realized gains 348 162 1,120  Gross realized losses (54) - - The following table shows securities with gross unrealized losses and their fair values by the length of time that the individual securities had been in a continuous unrealized loss position at December 31, 201 6 and 201 5 . Securities whose market values exceed cost are excluded from this table.     Continuous Unrealized  Amortized cost of Loss Existing for: Fair value of  Number of securities with Less Than More Than securities with  (Dollars in thousands) Securities unrealized losses 12 Months 12 Months unrealized losses  At December 31, 2016  Held to Maturity:  Obligations of state and political subdivisions 7 $ 1,987 $ (8) $ - $ 1,979  7 $ 1,987 $ (8) $ - $ 1,979   Available for Sale:  Federal agency securities 13 $ 34,734 $ (111) $ (87) $ 34,536  Obligations of state and political subdivisions 36 18,283 (145) (46) 18,092  Residential mortgage-backed securities 89 225,986 (1,618) (348) 224,020  Asset-backed securities 3 9,265 - (88) 9,177  Other Securities 2 5,005 - (72) 4,933  Total 143 $ 293,273 $ (1,874) $ (641) $ 290,758   At December 31, 2015  Held to Maturity:  Obligations of state and political subdivisions 1 $ 1,677 $ - $ (3) $ 1,674  1 $ 1,677 $ - $ (3) $ 1,674   Available for Sale:  Federal agency securities 14 $ 42,438 $ (138) $ (235) $ 42,065  Obligations of state and political subdivisions 14 11,765 (57) (77) 11,631  Residential mortgage-backed securities 87 175,043 (1,247) (605) 173,191  Asset-backed securities 3 9,639 (115) (109) 9,415  Other Securities 6 14,987 (75) (71) 14,841  Total 124 $ 253,872 $ (1,632) $ (1,097) $ 251,143  We evaluate all securities on an individual basis for other-than-temporary impairment on at least a quarterly basis. Consideration is given to the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of us to retain our investment in the issuer for a period of time sufficient to allow for an anticipated recovery in fair value. Management has the ability and intent to hold the securities classified as held to maturity in the table above until they mature, at which time we expect to receive full value for the securities. Furthermore, as of December 31, 201 6 , management does not have the intent to sell any of the securities classified as available for sale in the table above and believes that we will most likely not have to sell any such securities before a recovery of cost. The declines in fair value were attributable to increases in market interest rates over the yields available at the time the underlying securities were purchased or increases in spreads over market interest rates. Management does not believe any of the securities are impaired due to credit quality. Accordingly, as of December 31, 201 6 , management believes the impairment of these investments is not deemed to be other-than-temporary. As required by law, available for sale investment securities are pledged to secure public and trust deposits, sweep agreements, borrowings from the FHLB, and for other applicable purposes. Securities with an amortized cost of $ 199.0 million and $ 174.0 million were pledged to meet such requirements at December 31, 201 6 and 201 5 , respectively. A ny amount over-pledged can be released at any time.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	12 Months Ended
	Dec. 31, 2016
Loans And Allowance For Loan Losses [Abstract]
Loans And Allowance For Loan Losses	 Note 5 : Loans and Allowance for Loan Losses We exten d commercial and consumer credit primarily to customers in the states of Oklahoma, Texas, Kansas , and Colorado . Our commercial lending operations are concentrated in Oklahoma City, Dallas, Tulsa, and other metropolitan markets in Texas, Kansas, Oklahoma , and Colorado . As a result, the collectability of our loan portfolio can be affected by changes in the economic conditions in those states a nd markets. Please see “Note 20: Operating Segments ” for more detail regarding loans by market. At December 31, 2016 and 2015, substantially all of our loans were collateralized with real estate, inventory, accounts receivable, and/or other assets or were guaranteed by agencies of the United States government.  Our loan classifications were as follows:      (Dollars in thousands) At December 31, 2016 At December 31, 2015  Real estate mortgage:  Commercial $ 882,071 $ 938,462  One-to-four family residential 199,123 161,958  Real estate construction:  Commercial 199,113 129,070  One-to-four family residential 20,946 21,337  Commercial 556,248 507,173  Installment and consumer 19,631 21,429  Total loans, including held for sale 1,877,132 1,779,429  Less allowance for loan losses (27,546) (26,106)  Total loans, net $ 1,849,586 $ 1,753,323 Concentrations of Credit . At Dec embe r 31, 201 6 , $608.6 million, or 32% , and $ 423.8 million, or 23 %, of our loans consisted of loans to individuals and businesses in the real estate and healthcare industries, respectively . We do not have any other concentrations of loans to individuals or businesses involved in a single industry totaling 10% or more of total loans. Loans Held for Sale . We had loans which were h eld for sale of $ 4.4 million and $ 7.5 million at December 31, 201 6 and 2015, respectively. The loans currently classified as held for sale, primarily residential mortgage loans, are carried at the lower of cost or market value. A substantial portion of the one-to-four family residential loans and loan servicing rights , if not retained, are primarily sold to one investor. These mortgage loans are generally sold within a one -month period from loan closing at amounts determined by the investor commitment based upon the pricing of the loan. Loan Servicing . We earn fees for servicing real estate mortgages and other loans owned by others. The fees are generally calculated on the outstanding principal balance of the loans serviced and are recorded as noninterest income when earned. The unpaid principal balance of real estate mortgage loans serviced for ot hers t ota l ed $ 460.1 million and $ 432.3 million at December 31, 2016 and 2015 , respectively. Loan servicing rights are capitalized based on estimated fair value at the point of origination. The servicing rights are amortized over the period of estimated net servicing income.  Nonperforming / Past Due Loans . The following table shows the recorded investment in loans on nonaccrual status.      At December 31,  (Dollars in thousands) 2016 2015  Real estate mortgage:  Commercial $ 6,471 $ 3,543  One-to-four family residential 2,766 1,729  Real estate construction:  Commercial 522 562  One-to-four family residential 448 448  Commercial 5,949 13,491  Other consumer 111 85  Total nonaccrual loans $ 16,267 $ 19,858 If interest on nonaccrual loans had been accrued, the interes t income as reported in the accompanying Consolidated Statements of Operations would have increased by approximately $ 1.0 million , $ 0.8 million, and $ 0.7 million, for 2016, 2015, and 2014 , respectively.  Net cumulative charge-offs against nonaccrual loa ns at December 31, 2016 and 2015 were $ 3.3 million and $ 6.1 million, respectively.  The following table shows the delinquency status of past due loans at the end of the respective reporting period.     90 days and Recorded loans  30-89 days greater Total past Total > 90 days and  (Dollars in thousands) past due past due due Current loans accruing  At December 31, 2016  Real estate mortgage:  Commercial $ 24 $ 6,472 $ 6,496 $ 875,575 $ 882,071 $ -  One-to-four family residential 631 2,903 3,534 195,589 199,123 138  Real estate construction:  Commercial - 522 522 198,591 199,113 -  One-to-four family residential - 448 448 20,498 20,946 -  Commercial 2,530 6,142 8,672 547,576 556,248 193  Other 359 123 482 19,149 19,631 12  Total $ 3,544 $ 16,610 $ 20,154 $ 1,856,978 $ 1,877,132 $ 343    At December 31, 2015  Real estate mortgage:  Commercial $ 272 $ 3,992 $ 4,264 $ 934,198 $ 938,462 $ 449  One-to-four family residential 549 1,777 2,326 159,632 161,958 48  Real estate construction:  Commercial - 493 493 128,577 129,070 -  One-to-four family residential - 517 517 20,820 21,337 -  Commercial 278 13,491 13,769 493,404 507,173 -  Other 65 88 153 21,276 21,429 3  Total $ 1,164 $ 20,358 $ 21,522 $ 1,757,907 $ 1,779,429 $ 500   Impaired Loans . The following table presents loans individual ly evaluated for impairment by class of loans at the end of the respective reporting period.      With No Specific Allowance With A Specific Allowance  Unpaid Unpaid  Recorded Principal Recorded Principal Related  (Dollars in thousands) Investment Balance Investment Balance Allowance  At December 31, 2016  Commercial real estate $ 1,536 $ 3,057 $ 6,053 $ 6,529 $ 2,219  One-to-four family residential 1,188 1,535 1,593 1,698 63  Real estate construction 762 926 207 245 40  Commercial 1,032 2,861 4,963 7,480 1,346  Other 111 115 - - -  Total $ 4,629 $ 8,494 $ 12,816 $ 15,952 $ 3,668   At December 31, 2015  Commercial real estate $ 12,166 $ 15,747 $ 10,940 $ 10,940 $ 1,575  One-to-four family residential 1,688 2,195 185 186 11  Real estate construction 1,078 1,327 - - -  Commercial 4,095 5,430 9,844 15,968 2,526  Other 85 94 - - -  Total $ 19,112 $ 24,793 $ 20,969 $ 27,094 $ 4,112   The following table presents the average recorded investment and interest income recognized on impaired loans for the year ended December 31, 2016, 2015, and 2014 .      As of and for the year ended December 31,  2016 2015 2014  Average Average Average  Recorded Interest Recorded Interest Recorded Interest  (Dollars in thousands) Investment Income Investment Income Investment Income  Commercial real estate $ 7,394 $ 750 $ 25,044 $ 970 $ 30,257 $ 968  One-to-four family residential 3,448 15 2,323 1 2,764 1  Real estate construction 1,050 14 997 - 222 -  Commercial 6,905 96 8,527 215 7,718 68  Other 52 3 51 - 16 -  Total $ 18,848 $ 878 $ 36,942 $ 1,186 $ 40,977 $ 1,037 Included in interest income recognized on impaire d loans ar e $ 0.9 million, $ 1.2 million , and $1.0 million , for December 31, 2016, 2015, and 2014 , re spectively .  Troubled Debt Restructurings. The loan portfolio also includes certain loans that have been modified in a troubled debt restructuring, where economic concessions have been granted to borrowers who have experienced financial difficulties. These concessions typically result from loss mitigation activities and can include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance, or other actions. Troubled debt restructurings are classified as impaired at the time of restructuring and classified as nonperforming, potential problem, or performing restructured, as applicable. Loans modified in troubled debt restructurings may be returned to performing status after considering the borrowers’ sustained repayment for a reasonable period of at least six months. When we modi fy loans in a troubled debt restructuring, an evaluation of any possible impairment is performed similar to other impaired loans based on the present value of expected future cash flows, discounted at the contractual interest rate of the original loan agreement, or use of the current fair value of the collateral, less selling costs for collateral dependent loans. If it is determined that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs, and unamortized premium or discount), an impairment is recognized through an allowance estimate or a charge-off to the allowance. In periods subsequent to modification, all loans modified in troubled debt restructurings are evaluated, including those that have payment defaults, for possible impairment. Troubled debt restructured loans out standing as of December 31, 2016 and 2015 are as follows:      At December 31, 2016 At December 31, 2015  (Dollars in thousands) Accruing Nonaccrual Accruing Nonaccrual  Commercial real estate $ 1,118 $ 475 $ 19,563 $ 448  One-to-four family residential 15 46 13 48  Commercial 45 3,323 659 5,796  Total $ 1,178 $ 3,844 $ 20,235 $ 6,292 At December 31, 2016 and 2015 , we had no significant commitments to lend additional funds to debtors whose loan terms have been modified in troubled debt restructuring.  Loans modified as troubled debt restructurings that occurred during the year ended December 31, 2016 and 2015 are shown in the following tables:    For the year ended December 31,  2016 2015  Number of Recorded Number of Recorded  (Dollars in thousands) Modifications Investment Modifications Investment  Commercial real estate 1 $ 164 - $ -  Commercial 1 24 1 5,511  Total 2 $ 188 1 $ 5,511 The modifications of loans identified as troubled debt restructurings primarily related to payment extensions and/or reductions in the interest rate. The financial impact of troubled debt restructurings is not significant. As of December 31, 2016 and 2015, there were no loans modified as a troubled debt restructuring which subsequently defaulted. Default, for this purpose, is deemed to occur when a loan is 90 days or more past due or transferred to nonaccrual and is within twelve months of restructuring.  Credit Quality Indicators . To assess the credit quality of loans, we categorize loans into risk categories based on relevant information about the ability of the borrowers to service their debts such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. This analysis is performed on a quarterly basis. We use the following definitions for risk ratings: Special mention – Loans classified as special mention have potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for these loans or of the institution’s credit position at some future date. Substandard – Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligors or of the collateral pledged, if any. Loans so classified have one or more well-defined weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. These loans are considered potential problem or nonperforming loans depending on the accrual status of the loans. Doubtful – Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristics that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. These loans are considered nonperforming.  Loans not meeting the criteria above that are analyzed as part of the above described process are considered to be pass rated loans. As of December 31, 2016 and 2015 , based on the most recent analysis performed as of those dates, the risk category of loans by class is as follows:     Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At December 31, 2016  Grade:  Pass $ 857,290 $ 192,395 $ 210,780 $ 498,039 $ 19,518 $ 1,778,022  Special Mention 4,479 1,983 7,720 24,639 - 38,821  Substandard 20,302 4,745 1,559 33,175 113 59,894  Doubtful - - - 395 - 395  Total $ 882,071 $ 199,123 $ 220,059 $ 556,248 $ 19,631 $ 1,877,132   At December 31, 2015  Grade:  Pass $ 902,034 $ 157,912 $ 148,811 $ 480,928 $ 21,284 $ 1,710,969  Special Mention 5,916 29 586 2,941 50 9,522  Substandard 30,512 4,017 1,010 18,848 95 54,482  Doubtful - - - 4,456 - 4,456  Total $ 938,462 $ 161,958 $ 150,407 $ 507,173 $ 21,429 $ 1,779,429 Allowance for Loan Losses . The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment evaluatio n method as of December 31, 2016, 2015 and 2014 .      Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At December 31, 2016  Balance at beginning of period $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106  Loans charged-off (193) (134) - (6,148) (522) (6,997)  Recoveries 400 77 - 3,079 112 3,668  Provision (credit) for loan losses (416) 520 969 3,162 534 4,769  Balance at end of period $ 12,507 $ 1,163 $ 3,502 $ 10,058 $ 316 $ 27,546   Allowance for loan losses ending balance:  Individually evaluated for impairment $ 2,219 $ 63 $ - $ 1,346 $ - $ 3,628  Collectively evaluated for impairment 10,288 1,100 3,462 8,712 316 23,878  Acquired with deteriorated credit quality - - 40 - - 40  Total ending allowance balance $ 12,507 $ 1,163 $ 3,502 $ 10,058 $ 316 $ 27,546   Loans receivable ending balance:  Individually evaluated for impairment $ 6,606 $ 1,766 $ 390 $ 5,357 $ - $ 14,119  Collectively evaluated for impairment 872,997 196,123 219,015 550,615 19,631 1,858,381  Acquired with deteriorated credit quality 2,468 1,234 654 276 - 4,632  Total ending loans balance $ 882,071 $ 199,123 $ 220,059 $ 556,248 $ 19,631 $ 1,877,132      Commercial 1-4 Family Real Estate  Real Estate Residential Construction Commercial Other Total  At December 31, 2015  Balance at beginning of period $ 13,678 $ 712 $ 4,159 $ 9,614 $ 289 $ 28,452  Loans charged-off (489) (20) (21) (628) (193) (1,351)  Recoveries 282 558 47 1,479 205 2,571  Provision (credit) for loan losses (755) (550) (1,652) (500) (109) (3,566)  Balance at end of period $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106   Allowance for loan losses ending balances:  Individually evaluated for impairment $ 1,575 $ 11 $ - $ 2,526 $ - $ 4,112  Collectively evaluated for impairment 11,141 689 2,533 7,439 192 21,994  Acquired with deteriorated credit quality - - - - - -  Total ending allowance balance $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106   Loans receivable ending balance:  Individually evaluated for impairment $ 20,332 $ 695 $ 391 $ 13,396 $ 47 $ 34,861  Collectively evaluated for impairment 913,242 159,672 149,344 493,026 21,370 1,736,654  Acquired with deteriorated credit quality 4,888 1,591 672 751 12 7,914  Total ending loans balance $ 938,462 $ 161,958 $ 150,407 $ 507,173 $ 21,429 $ 1,779,429     Commercial 1-4 Family Real Estate  Real Estate Residential Construction Commercial Other Total  At December 31, 2014  Balance at beginning of period $ 18,854 $ 850 $ 5,523 $ 10,985 $ 451 $ 36,663  Loans charged-off (1,400) (289) (655) (4,014) (558) (6,916)  Recoveries 3,733 213 - 1,119 264 5,329  Provision (credit) for loan losses (7,509) (62) (709) 1,524 132 (6,624)  Balance at end of period $ 13,678 $ 712 $ 4,159 $ 9,614 $ 289 $ 28,452   Allowance for loan losses ending balances:  Individually evaluated for impairment $ 2,047 $ - $ - $ 1,822 $ - $ 3,869  Collectively evaluated for impairment 11,631 712 4,159 7,792 289 24,583  Acquired with deteriorated credit quality - - - - - -  Total ending allowance balance $ 13,678 $ 712 $ 4,159 $ 9,614 $ 289 $ 28,452   Loans receivable ending balance:  Individually evaluated for impairment $ 23,907 $ 538 $ 104 $ 13,560 $ 2 $ 38,111  Collectively evaluated for impairment 725,635 75,598 196,905 336,818 21,953 1,356,909  Acquired with deteriorated credit quality 3,429 1,395 114 32 1 4,971  Total ending loans balance $ 752,971 $ 77,531 $ 197,123 $ 350,410 $ 21,956 $ 1,399,991 

Premises And Equipment

Premises And Equipment	12 Months Ended
	Dec. 31, 2016
Premises And Equipment [Abstract]
Premises And Equipment	 Note 6 : Premises and Equipment  Year-end premises and equipment were as follows:     At December 31,  (Dollars in thousands) 2016 2015  Land $ 6,630 $ 6,630  Buildings and improvements 25,861 25,219  Furniture, fixtures, and equipment 32,409 30,813  Construction/remodeling in progress 38 965  64,938 63,627  Accumulated depreciation and amortization (42,130) (39,808)  Total premises and equipment, net $ 22,808 $ 23,819   Depreciation of premises and equipment totale d $2.8 million in 2016, $ 2.5 million in 2015, and $ 2. 8 million in 2014 .  We lease certain equipment and premises for our operations. Future minimum annual rental payments required under operating leases, net of sublease agreements, that have initial or remaining lease terms in excess of one year as of December 31, 2016 were as follows:     (Dollars in thousands)  2017 $ 2,723  2018 2,277  2019 2,091  2020 2,016  2021 1,333  Thereafter 2,822  Total $ 13,262  The total rental expense was $ 3.6 million , $ 2.9 million, and $ 2.4 million in 2016, 2015, and 2014 , respectively. 

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill And Other Intangible Assets [Abstract]
Goodwil And Other Intangible Assets	Note 7 : Goodwill and Other Intangible Assets  We ha ve recorded goodwill and other identifiable intangible assets associated with purchase business combinations. Goodwill is not amortized, but is periodically evaluated for impairment. We perform an annual goodwill impairment test each year and assess qualitative factors on a quarterly basis that would indicate events or circumstances that an impairment might have taken place.  At December 31, 2016 and 2015, g oodwill tota led $13.5 million, of whic h $12.5 million of goodwill is reported in the Oklahoma Banking segment and $1.0 million is reported in the Texas Ba nking segment . In 2015, $ 12.3 million of goodwill was recorded as a result of the acquisition of Bancshares . Further information regarding operating segments can be found in “Note 20 Operating Segments”.  Based on our annual goodwill impai rment test through December 31, 2016 , management does not believe any of its goodwill is impaired as of December 31, 2016 . We did not recognize an impairment during t he years ended December 31, 2016 , 2015 and 2014 .  The following table presents the gross carrying amount of other intangible assets and accumulated amortization.     At December 31,  (Dollars in thousands) 2016 2015  Core deposit premiums $ 6,119 $ 6,119  Less accumulated amortization (3,820) (3,225)  Core deposit premiums, net 2,299 2,894   Loan servicing rights 14,710 13,635  Less accumulated amortization (11,219) (9,914)  Loan servicing rights, net 3,491 3,721   Other intangible assets, net $ 5,790 $ 6,615  Core deposit intangibles are amortized using an economic life method based on deposit attrition. As a result, amortization will decline over time with most of the amortization occurring during the initial years. The weighted average amortization period for core deposit intangibles is approximately 10 years. Amortization expense related to core deposit intangibles totaled $0.6 million in 2016, $ 0. 3 m illion in 2015, and $0.4 million in 2014 . In 2015 , $ 2. 7 million of core deposit intangibles was recorded as a result of the acquisition of Bancshares . As of December 31, 2016, economic conditions did not indicate that impairment existed for the core deposit intangibles and therefore no impairment evaluation was performed. We did not recognize any impairment during the years ended December 31, 2016 , 2015 , and 2014 .  During 2016, 2015, and 2014 , we had recorded loan servicing right s amortization expense of $ 0.7 millio n, $ 0.6 million , and $0.4 million , respectively. As of December 31, 2016 , mortgage loan servicing rights had a fair value of $4.2 million, which exceeded the book value of $3.5 million. Because the fair value exceeded the book value, there was no impairment charge at December 31, 2016. During the first three quarters of 2016, the mortgage loan servicing rights were written down to their fair values, resulting in total impairment charges of $0.6 million, which was included in noninterest income. As of December 31, 2015, mortgage loan servicing rights were written down to their fair values, resulting in an impairment charge of $0.1 million, which was included in noninterest income . We did not recognize any impairment during the year ended December 31, 2014 .  The estimated aggregate future amortization expense for other intangible assets r emaining as of December 31, 2016 is as follows:    (Dollars in thousands) Core Deposit Premiums Loan Servicing Rights Total  2017 $ 451 $ 654 $ 1,105  2018 391 571 962  2019 386 478 864  2020 386 396 782  2021 386 323 709  Thereafter 299 1,069 1,368  $ 2,299 $ 3,491 $ 5,790 

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
Fair Value Measurements [Abstract]
Fair Value Measurements	 Note 8 : Fair Value Measurements Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. In estimating fair value, we utilize valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC 820, Fair Value Measurements , establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1 Quoted prices in active markets for identical instruments. Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The estimated fair value amounts have been de termined by us using available market information and appropriate valuation methodologies. However, considerable judgment is required to interpret market data to develop the estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amount we could realize in a current market exchange. The use of different market assumptions and/or estimation methodologies could have a material effect on the estimated fair value amounts. There were no significant changes in valuation methods used to estimate fair value during the year ended December 31, 2016 . A description of the valuation methodologies used for instruments measured at fair value on a recurring basis is as follows: Available for sale securities – The fair value of U.S. Government and federal agency securities, equity securities, and residential mortgage-backed securities is estimated based on quoted market prices or dealer quotes. The fair value of other investments such as obligations of state and political subdivisions is estimated based on quoted market prices , when available . We obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and bond’s terms and conditions, among other things. We review the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. Derivative instrument s – We utilize an interest rate swap agreement to convert one of our variable-rate subordinated debentures to a fixed rate. This has been designated as a cash flow hedge. During 2014, we began offering an interest rate swap program that permits qualified customers to manage interest rate risk on variable rate loans with Bank SNB. Derivative contracts are executed between our customers and Bank SNB. Offsetting contracts are executed by Bank SNB and approved counterparties. The counterparty contracts are identical to customer contracts, except for a fixed pricing spread or fee paid to us. The fair value of the interest rate swap agreements are obtained from dealer quotes.  The following table summarizes financial assets measured at fair value on a recurri ng basis as of December 31, 2016 and 2015 .     Fair Value Measurement at Reporting Date Using  Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  (Dollars in thousands) Total (Level 1) (Level 2) (Level 3)  At December 31, 2016  Available for sale securities:  Federal agency securities 69,694 - 69,694 -  Obligations of state and political subdivisions 46,375 - 46,375 -  Residential mortgage-backed securities 280,642 - 280,642 -  Asset-backed securities 9,177 - 9,177 -  Corporate debt 20,330 213 20,117 -   Derivative asset 1,235 1,235  Derivative liability (1,890) - (1,890) -  Total $ 425,563 $ 213 $ 425,350 $ -   At December 31, 2015  Available for sale securities:  Federal agency securities 78,211 - 78,211 -  Obligations of state and political subdivisions 47,564 - 47,564 -  Residential mortgage-backed securities 239,888 - 239,888 -  Asset-backed securities 9,415 - 9,415 -  Corporate debt 25,253 137 25,116 -   Derivative asset 1,793 1,793 -  Derivative liability (3,163) - (3,163) -  Total $ 398,961 $ 137 $ 398,824 $ - Certain financial assets are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). T hese assets are recorded at the lower of cost or fair value. Valuation methodologies for assets measured on a nonrecurring basis are as follows: Impaired loans – Certain impaired loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. Collateral values are estimated using Level 3 inputs based on third-party appraisals. Certain other impaired loans are remeasured and reported through a specific valuation allowance allocation of the allowance for loan losses based upon the net present value of cash flows. Loans held for sale – Real estate mortgage loans held for sale are carried at the lower of cost or market, which is determined on an individual loan basis. The fair value of loans held for sale is based on existing investor commitments. Other real estate – Other real estate fair value is based on third-party appraisals for properties less the estimated costs to sell the asset. Goodwill – Fair value of goodwill is based on the fair value of each of our reporting units to which goodwill is allocated compared with their respective carrying value. There ha s been no impairment during 2016 or 2015 ; therefore, no fair value adjustment was recorded through earnings. Core deposit premiums – There has been no impairment during 201 6 or 2015 ; therefore, no fair value adjustment was recorded through earnings. Mortgage loan servicing rights – Mortgage loan servicing rights are carried at the lower of cost or market. There is no active trading market for loan servicing rights. The fair value of loan servicing rights is estimated by calculating the present value of net servicing revenue over the anticipated life of each loan. A cash flow model is used to determine fair value. Key assumptions and estimates, including projected prepayment speeds and assumed servicing costs, earnings on escrow deposits, ancillary income, and discount rates, used by this model are based on current market sources. A separate third party model is used to estimate prepayment speeds based on interest rates, housing turnover rates, estimated loan curtailment, anticipated defaults, and other relevant factors. The prepayment model is updated for changes in market conditions. Assets that are measured at fair value on a nonrecurri ng basis as of December 31, 2016 and 2015 are summarized below.     Fair Value Measurements Using  Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  (Dollars in thousands) Total (Level 1) (Level 2) (Level 3)  At December 31, 2016  Impaired loans at fair value :  Commercial real estate $ 6,053 $ - $ $ 6,053  One-to-four family residential 1,593 - - 1,593  Real estate construction 207 - - 207  Commercial 5,357 - 5,357   Loans held for sale:  One-to-four family residential 4,386 - 4,386 -   Total $ 17,596 $ - $ 4,386 $ 13,210   At December 31, 2015  Impaired loans at fair value :  Commercial real estate $ 11,182 $ - $ $ 11,182  One-to-four family residential 185 - - 185  Real estate construction 390 - - 390  Commercial 9,845 - 9,845   Loans held for sale:  One-to-four family residential 7,453 - 7,453 -   Other real estate 2,274 - - 2,274  Mortgage loan servicing rights 3,721 - 3,721 -  Total $ 35,050 $ - $ 11,174 $ 23,876 Impaired loans measured at fair value with a carrying amount of $ 19.7 million were written down to a fair value of $ 13.2 million, resulting in a life-to-date impairment of $ 6.5 million. As of December 31, 2015, impaired loans measured at fair value with a carrying amount of $ 25.9 million were written down to the fair value of $ 21.6 million at December 31, 2015, resulting in a life-to-date impairment charge of $ 4.3 million. No impairment was recognized for other real estate during the period ended December 31, 2016 . As of December 31, 201 5 , other real estate assets were written down to their fair values, resulting in an impairment charge of approximately $ 0.1 million , which was included in noninterest expense for the year ended December 31, 201 5 .  As of December 31, 2016 , mortgage loan servicing rights had a fair value of $4.2 million, which exceeded the book value of $3.5 million. Because the fair value exceeded the book value, there was no impairment charge at December 31, 2016. During the first three quarters of 2016, the mortgage loan servicing rights were written down to their fair values, resulting in total impairment charges of $0.6 million, which was included in noninterest income. As of December 31, 2015, mortgage loan servicing rights were written down to their fair values, resulting in an impairment charge of $0.1 million , which was included in noninterest income . ASC 825, Financial Instruments , requires an entity to provide disclosures about fair value of financial instruments, including those that are not measured and reported at fair value on a recurring or nonrecurring basis. The methodologies used in estimating the fair value of financial instruments that are measured on a recurring or nonrecurring basis are discussed above. The methodologies for the other financial instruments are discussed below: Cash and cash equivalents – For cash and cash equivalents, the carrying amount is a reasonable estimate of fair value. Securities held to maturity – The investment securities held to maturity are carried at cost. The fair value of the held to maturity securities is estimated based on quoted market prices or dealer quotes. Loans , net of allowance – Fair values are estimated for certain homogenous categories of loans adjusted for differences in loan characteristics. Our loans have been aggregated by categories consisting of commercial, real estate , and other consumer. The fair value of loans is estimated by discounting the cash flows using risks inherent in the loan category and interest rates currently offered for loans with similar terms and credit risks. Accrued interest receivable – The carrying amount is a reasonable estimate of fair value for accrued interest receivable. Investment s included in other assets – The estimated fair value of investments included in other assets, which primarily consists of investments carried at cost, approximates their carrying values. Deposits – The fair value of demand deposits, savings accounts, and certain money market deposits is the amount payable on demand at the statement of financial condition date. The fair value of fixed matur ity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. Other liabilities and accrued interest payable – The estimated fair value of other liabilities, which primarily includes trade accounts payable , employee benefits, and accrued interest payable, approximates their carrying values. Other borrowings – Included in other borrowings are FHLB advances and securities sold und er agreements to repurchase . The fair value for fixed rate FHLB advances is based upon discounted cash flow analysis using interest rates currently being offered for similar instruments. The fair values of other borrowings are the amounts payable at the statement of financial condition date, as the carrying amount is a reasonable estimate of fair value due to the short-term maturity rates. Subordinated debentures – All subordinated debentures have floating rates that reset quarterly . The fair value of the floating rate subordinated debentures approximates carrying value at Decem ber 31, 2016 and December 31, 2015.  The carrying values and estimated fair values of our financial instruments segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value are as follows:     At December 31, 2016 At December 31, 2015  Carrying Fair Carrying Fair  (Dollars in thousands) Values Values Values Values  Financial assets:  Level 2 inputs:  Cash and cash equivalents $ 75,650 $ 75,650 $ 78,129 $ 78,129  Securities held to maturity 10,443 10,677 11,797 12,282  Accrued interest receivable 6,194 6,194 5,767 5,767  Mortgage loan servicing rights 3,491 4,159 3,721 3,721  Bank-owned life insurance 28,575 28,575 27,676 27,676  Investments included in other assets 14,627 14,627 10,383 10,383  Level 3 inputs:  Total loans, net of allowance 1,849,586 1,839,960 1,753,323 1,728,114  Financial liabilities:  Level 2 inputs:  Deposits 1,946,018 1,897,927 1,884,105 1,780,954  Accrued interest payable 1,132 1,132 867 867  Other liabilities 9,516 9,516 10,314 10,314  Other borrowings 183,814 183,926 110,927 112,149  Subordinated debentures 46,393 46,393 51,548 51,548  

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	 Note 9 : Deposits  The following table summarizes deposits as of December 31, 2016 and 2015 .     (Dollars in thousands) 2016 2015  Noninterest-bearing demand $ 551,709 $ 596,494  Interest-bearing demand 152,656 151,015  Money market accounts 567,058 534,357  Savings accounts 56,410 56,333  Time deposits of $100,000 or more 360,307 311,538  Other time deposits 257,878 234,368  Total deposits $ 1,946,018 $ 1,884,105  The total amount of overdrawn deposit accounts that were reclassifi ed as loans at December 31, 2016 and 201 5 was $0.3 million for both years.  The aggregate amounts of time deposits in denominations of $250,000 or more at December 31, 201 6 and 201 5 were $122.0 million and $95.4 million, respectively.  Some of our interest-bearing deposits were obtained through brokered transactions and we participat e in the Certificate of Deposit Account Registry Service (“CDARS”). CDARS depos its totaled $ 29.0 million at December 31, 2016 and $ 22.5 million at December 31, 2015 . There were capital market certificate of deposits of $35.6 million at December 31, 2016 and $ 17.3 million at December 31, 201 5 .  Scheduled time deposit maturities as of December 31, 2016 are as follows:       (Dollars in thousands)  2017 $465,324  2018 115,862  2019 22,025  2020 8,372  2021 6,575  Thereafter 27  Total time deposits $618,185  

Borrowed Funds

Borrowed Funds	12 Months Ended
	Dec. 31, 2016
Borrowed Funds [Abstract]
Borrowed Funds	 Note 10 : Borrowed Funds  We have available various forms of other borrowings for cash management and liquidity purposes. These fo rms of borrowings include short- term federal funds purchased and securities sold under agreements to repurchase, and advances from the FHLB and the FRB. The following table summarizes borrowed funds for the periods indicated:     2016 2015  (Dollars in thousands) Balance at December 31 Average Balance Weighted Average Rate Balance at December 31 Average Balance Weighted Average Rate  Securities sold under repurchase  agreements $ 45,814 $ 45,812 0.05 % $ 37,273 $ 44,218 0.07 %  Federal Home Loan Bank advances 138,000 97,569 1.31 73,654 28,289 3.11  $ 183,814 $ 110,927  We have approved federal funds purchase lines to taling $ 60.0 million w ith three fina ncial entities. We sell securities under agreements to repurchase with us retaining custody of the collateral. Collateral consists of direct obligations of U.S. Government and Federal Agency issues, which are designated as pledged with our safekeeping agent. The type of collateral required, the retention of the collateral, and the security sold, minimize our risk of exposure to loss. These transactions are for one-to-four day periods. At December 31, 2016 and 2015, the amount of collateral pledged is $61.5 million and $58.9 million, respectively.  We have entered into an agreement with the FHLB to obtain advances fr om the FHLB from time to time. At December 31, 201 6, Bank S NB had an outstanding balance o f $ 138.0 million in advances from the FHLB . The terms of the agreement are set forth in the Advance, Pledge and Security Agreement between Bank SNB and FHLB (the “Agreement”). The FHLB requires that we pledge collateral on such advances. Under the terms of the Agreement, the discounted value of the collateral, as defined by the FHLB, should at all times be at least equal to the amount borrowed by us. Such advances outstanding are subject to a blanket collateral arrangement, which requires the pledging of eligible collateral to secure such advances. Such collateral princ ipally includes certain loans and securities. At December 31, 201 6 and 201 5 , loans pledged under the Agreement were $ 577.7 million and $ 447.9 million, and investment securities pledged (at carrying value) were $ 0 for both years. Scheduled minimum future principal payments to the FHLB as of December 31, 2016 are as follows: $138.0 million in 2017 .  We are qualified to borrow funds from the FRB through their Borrower-In-Custody program. Collateral under this prog ram consists of pledged selected commercial and industrial loans. Currently, the collateral will allow us to borrow up to $ 106.7 million. At December 31, 2016 and 2015, we had no outstanding FRB borrowings. 

Trust Preferred Securities and

Trust Preferred Securities and Subordinated Debentures	12 Months Ended
	Dec. 31, 2016
Subordinated Debentures [Abstract]
Subordinated Debentures	Note 11 : Trust Preferred Securities and Subordinated Debentures At December 31, 201 6 and 2015 , we had the following issues of trust preferred securities outstanding and subordinated debentures owed to the Trusts.     At December 31, 2016  (Dollars in thousands) Subordinated Debentures Owed to Trusts Trust Preferred Securities of the Trusts Rates Final Maturity Date  OKSB Statutory Trust I $ 20,619 $ 20,000 4.10% June 26, 2033  SBI Capital Trust II 25,774 25,000 3.73% October 7, 2033  $ 46,393 $ 45,000     At December 31, 2015  (Dollars in thousands) Subordinated Debentures Owed to Trusts Trust Preferred Securities of the Trusts Rates Final Maturity Date  OKSB Statutory Trust I $ 20,619 $ 20,000 3.70% June 26, 2033  SBI Capital Trust II 25,774 25,000 3.17% October 7, 2033  FCBI Statutory Trust I 5,155 5,000 3.33% September 4, 2033  $ 51,548 $ 50,000  On June 26, 2003, our subsidiary, OKSB Statutory Trust I, sold to investors in a private placement offering $ 20.0 million of adjustable rate trust preferred securities (the “OKSB Trust Preferred”). The OKSB Trust Preferred bear interest, adjustable quarterly, at 90-day LIBOR plus 3.10 %. In addition to these adjustable rate securities, OKSB Statutory Trust I sold $ 0.6 million of trust common equity to Southwest. The aggregate proceeds of $ 20.6 million were used to purchase an equal principal amount of adjustable rate subordinated debentures that bear interest, adjustable quarterly, at 90 -day LIBOR plus 3.10 % (the “OKSB Subordinated Debentures”). After deducting underwriter’s compensation and noninterest expenses of the offering, the net proceeds were available to us to increase capital and for general corporate purposes. Interest payments on the OKSB Subordinated Debentures are deductible for federal income tax purposes.  On October 14, 2003, our subsidiary, SBI Capital Trust II, sold to investors in a private placement offering $ 25.0 million of adjustable rate trust preferred securities (the “SBI II Trust Preferred”). The SBI II Trust Preferred bear interest, adjustable quarterly, at 90 -day LIBOR plus 2.85 %. In addition to these adjustable rate securities, SBI Capital Trust II sold $ 0.8 million of trust common equity to us . The aggregate proceeds of $ 25.8 million were used to purchase an equal principal amount of our adjustable rate subordinated debentures that bear interest, adjustable quarterly 90-day LIBOR plus 2.85 % (the “SBI II Subordinated Debentures”). The proceeds were available to us to increase capital and for general corporate purposes. Interest payments on the SBI II Subordinated Debentures are deductible for federal income tax purposes.  O n September 4 , 2003, FCBI Statutory Tru st I sold to investors in a private placement offering $5.0 million of adjustable rate trust preferred securities (the “ FCBI I Trust Preferred”). The FCBI I Trust Preferred bear interest, adjustable quarterly, at 90 -day LIBOR plus 3.00% . In addition to these adjustable rate securities, FCBI Statutory Trust I sold $0.2 million of trust common equity. The aggregate proceeds of $5.2 million were used to purchase an equal principal amount of our adjustable rate subordinated debentures that bear interest, adjustable quarterly 90 -day LIBOR plus 3.00% (the “ FCBI I Subordinated Debentures”). The proceeds were available to us to increase capital and for general corporate purposes. Interest payments on the FCBI I Subordinated Debentures are deductible for federal income tax purposes. These trust preferred security and subordinated debentures were inherited with the acquisition of FCBI and were redeemed on February 8, 2016.  At December 31, 201 6 , we had an aggregate of $ 46.4 million of subordinated debentures outstanding and had an asset of $ 1.4 million represe nting our total investment in the common equity issued by the Trusts. The sole assets of the Trusts are the subordinated debentures and the liabilities of the Trusts of the OKSB Trust Preferred and SBI II Trust Preferred. We have, through various contractual arrangements, unconditionally guaranteed payment of all obligations of our Trusts with resp ect to our OKSB Trust Preferred and our SBI II Trust Preferred.  The OKSB Trust Preferred, the OKSB Subordinated Debentures, the SBI II Trust Preferred, and the SBI II Subordinated Debentures, mature at or near the thirtieth anniversary date of their issuance. However, if certain conditions are met, the OKSB Trust Preferred and the OKSB Subordinated Debentures and the SBI II Trust Preferred and the SBI II Subordinated Debentures may be called at our discretion with thirty days’ notice .  We, OKSB Statutory Trust I, and SBI Capital Trust II believe that, taken together, our obligations under the Trust Preferred Guarantee Agreements, the Amended and Restated Trust Agreements, the Subordinated Debentures, the Indentures and the Agreements as to Expenses and Liabilities, entered into in connection with the offering of the Trust Preferred and the Subordinated Debentures, in the aggregate constitute a full and unconditional guarantee by us of the obligations of OKSB Statutory Trust I and SBI Capital Trust II under the Trust Preferred.  OKSB Statutory Trust I is a Connecticut statutory trust created for the purpose of issuing the OKSB Trust Preferred and purchasing the OKSB Subordinated Debentures, which are its sole assets. We own all of the 619 outstanding common securities of OKSB Statutory Trust I; the liquidation value is $ 1,000 per share.  SBI Capital Trust II is a Delaware statutory trust created for the purpose of issuing the SBI II Trust Preferred and purchasing the SBI II Subordinated Debentures, which are its sole assets. We own all of the 774 outstanding common securities of SBI Capital Trust II; the liquidation value is $ 1,000 per share.  FCBI Statutory Trust I is a statutory trust created fo r the purpose of issuing the FCBI I Trust Preferred and purchasing the FCBI I Subordinated Debentures, which are its sole assets. A ll trust assets were redeemed on February 8, 2016 .  Each of the Trust Preferred issuances meets the regulatory criteria for Tier I capital, subject to Federal Reserve guidelines that limit the amount of the Trust Preferred and cumulative perpetual preferred stock to an aggregate of 25 % of Tier I capital. At December 31, 2 01 6 , $ 45.0 mil lion of the Trust Preferred was included in Tier I capital.  We de-consolidate our investment s in OKSB Statutory Trust I, SBI Capital Trust II , and FCBI Statutory Trust I (the “Trusts”) in this Annual Report. Due to this required de-consolidation, the trust preferred secur ities are not presented on the Consolidated Statements of Financial C ondition and the subordinated d ebentures are presented on the Consolidated Statements of Financial C ondition as a separate liability category.  The terms of the debentures allow us to defer payments of interest for up to 20 consecutive quarterly periods without default or penalty. These terms also allow us to resume payments at the end of any deferral period, or to extend the deferral up to the maximum 20 quarters in total. No deferral can extend past the maturity date of the debenture.   

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2016
Derivative Instruments [Abstract]
Derivative Instruments	 Note 1 2 : Derivative Instruments We utilize derivatives instruments to manage exposure to various types of interest rate risk for us and our customers within policy guidelines. All derivative instruments are carried at fair value, in which credit risk is considered in determining fair value.  Derivative contracts involve the risk of dealing with institutional derivative counterparties and their ability to meet contractual terms. Institutional counterparties must have an investment grade credit rating and be approved by our asset/liability management and executive loan committee s . Our credit exposure on interest rate swaps is limited to the net favorable value and i nterest payments of all swaps with each counterparty. Access to collateral in the event of default is reasonably assured. Therefore, credit exposure may be reduced by the amount of collateral pledged by the counterparty.  Customer Risk Management Interest Rate Swaps  Our qualified customers have the opportunity to participate in our interest rate swap program for the purpose of managing interest rate risk on their va riable rate loans with us. W e enter into such agreements with customers, then offsetting agreements are executed between us and approved dealer counterparties to minimize our market risk from changes in interest rates. The counterparty contracts are identical to customer contracts in terms of notional amounts, interest rates, and maturity dates , except for a fixed pricing spread or fee paid to us by the dealer counterparty. These interest rate swaps carry varying degrees of credit, interest rate and market or liquidity risks . The fair value of these derivative instruments are recognized as either non-hedge derivative assets or liabilities in the Consolidated Statements of Financial C ondition.  We have entered into nine customer interest rate swap agreements that effectively convert the loan interest rate from floating rate based on LIBOR to a fixed rate for the customer. As of December 31, 201 6 , these loans had an outstanding balance of $ 124.0 million. We have entered i nto offsetting agreements with dealer counterparties . The following table summarizes the fair values of derivative contracts recorded as “non-hedge derivative assets” and “non-hedge derivative liabilities” in the Consolidated Statements of Financial C ondition.    As of December 31,2016 As of December 31,2015  (Dollars in thousands) Notional Fair Value Notional Fair Value  Non-hedge derivative assets $ 123,953 $ 1,235 $ 101,629 $ 1,793  Non-hedge derivative liabilities 123,953 1,235 101,629 1,793  The floating rate paid in connection with these interest rate swap agreements is a contractual percentage rate spread to one-month LIBOR or to the Prime rate as of December 31, 2016. From time to time it may be necessary to post collateral with our dealer counterparties to secure the market values of these contracts. As of December 31, 2016, there was no collateral requirement with any of our dealer counterparties given the current market values of these contracts. These interest rate swaps are not designated as hedging instruments.  Interest Rate Swap on Trust Preferred Securities  We have an interest rate swap agreement with a total notional amount of $ 25.0 million. The interest rate swap contract was designated as a cash flow hedging instrument with the objective of protecting the overall cash flow from our quarterly interest payments on the SBI Capital Trust II preferred securities throughout the seven year period beginning February 11, 2011 and ending April 7, 2018 from the risk of variability of those payments resulting from changes in the three-month LIBOR . Under the swap, we will pay a fixed interest rate of 6.15 % and receive a variable interest rate of three-month LIBOR plus a margin of 2.85 % on a total notional amount of $ 25.0 million, with quarterly settlements. The rate received by us as of December 31, 201 6 w as 3.73 %. The estimated fair value of the interest rate derivative contract outstanding as of December 31, 201 6 and 201 5 resulted in a pre-tax l oss of $ 0.7 millio n and $ 1.4 million, respectively, and was included in other liabilities in the Consolidated Statement s of Financial Condition. The effective portion of the gain or loss due to changes in the fair value of the derivative hedging instrument, a $ 0.4 million gain and a $ 0.1 million gain for the year ended December 31, 201 6 and 201 5 , respectively, is included in other comprehensive income, net of tax, while the ineffective portion (indicated by the excess of the cumulative change in the fair value of the derivative over that which is necessary to offset the cumulative change in expected future cash flows on the hedge transaction) is included in other noninterest income or other noninterest expense. No ineffectiveness related to the interest rate derivative was recognized during either reporting period. Net cash flows as a result of the interest rate swap agreement w ere $ 0.7 million for the year ended December 31, 201 6 and $0.8 million for each of the years ended December 31, 201 5 and 2014 and were included in interest expense on subordinated debentures. We posted cash collateral with our counterparty related to the derivative contract in excess of the required $0.7 million and $1.4 million at December 31, 2016 and 2015, respectively.  There are no credit-risk-related contingent features associated with our derivative contract.  

Taxes On Income

Taxes On Income	12 Months Ended
	Dec. 31, 2016
Taxes On Income [Abstract]
Taxes On Income	Note 1 3 : Taxes on Income The components of taxes on income follow:     For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Current tax (benefit) expense:  Federal $ 8,809 $ 7,534 $ 3,251  State 173 143 186  Deferred tax expense (benefit):  Federal 44 1,126 7,970  State 783 990 1,210  Taxes on income $ 9,809 $ 9,793 $ 12,617  A reconciliation from the expected tax expense (benefit) using the U.S. Federal income tax rate of 35% to consolidated effective income tax expense (benefit) follows:     For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Computed tax (benefit) expense at statutory rates $ 9,630 $ 9,520 $ 11,777  Increase (decrease) in income taxes resulting from:  Benefit of income not subject to U.S. Federal income tax (632) (621) (209)  Expenses not deductible for U.S. Federal income tax 216 220 129  State income taxes, net of Federal income tax benefit 621 736 907  Other (26) (62) 13  Taxes on income $ 9,809 $ 9,793 $ 12,617  The calculated year-to-date effective t a x rate i s 35.7 % for 2 016 , 36.0% for 2015 , and 37.5 % for 2014 .  At December 31, 2013 , w e had $ 10.7 million federal net operating loss carryforward expiring in 2031 , $ 53.1 million of state net operating loss carryforward expiring in 2031 , and $ 0.6 million of state net operating loss carryforward expiring in 2021 . In addition, we had $ 2.5 millio n alternative minimum tax credit that can be carried forward indefinitely. During 2014, w e fully utilized the remaining federal net operating loss carryforward and the alternative minimum tax credit that had been carried forward . At December 31, 2016 , we had $10.3 mi llion of state net operating loss carryforward expiring in 2031 .  A deferred tax asset or liability is recognized for the tax consequences of temporary differences in the recognition of certain income and expense items for financial statement reporting purposes. A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. It was determined that no valuation allowance was required for both 2016 and 2015.  Net deferred ta x assets o f $ 13 . 2 mill ion an d $ 14.0 milli on at December 31, 2016 and 2015 , respectively, are reflected in the accompanying Consolidated Statements of Financial C ondition in other assets.  Temporary differences that give rise to the deferred tax assets include the following:      At December 31,  (Dollars in thousands) 2016 2015  Deferred tax assets:  Provision for loan losses $ 10,976 $ 10,291  Net operating loss carryforward 380 858  Write-downs on other real estate - 57  Nonaccrual loan interest 510 603  Deferred compensation & profit sharing accrual 782 711  Investments 306 311  Section 597 gain - FDIC-assisted acquisition 388 472  Accrued expenses 859 1,013  Loan purchase accounting adjustment 1,392 2,725  Stock-based compensation 805 629  Other 659 (2)  Total deferred tax assets 17,057 17,668   Deferred tax liabilities:  Accumulated depreciation (2,966) (2,877)  Amortizable assets (933) (1,089)  Dividend - Equity vs. Cost Method (471) (393)  Prepaid expenses (110) (109)  FHLB stock dividends (65) (132)  Total deferred tax liabilities (4,545) (4,600)  Deferred taxes payable on investment  securities available for sale 643 885  Net deferred tax asset $ 13,155 $ 13,953  We or one of our subsidiaries files income tax returns in the U.S. federal jurisdiction and various state jurisdictions. We are no longer subject to U.S. federal or state tax examinations for years before 2013. Additionally, as procedurally required, our company’s 2010 and 2011 federal returns were examined in connection with the 2011 net operating loss carryback and no adjustments were required.  Unrecognized Tax Benefits – ASC 740, Income Taxes , provides guidance on the recognition, measurement, and classification of income tax uncertainties, along with any related interest and penalties. As of December 31, 2016, we have no unrecognized tax benefits related to Federal or State income tax matters and do not anticipate any changes within the next twelve months. Additionally, no interest and penalties have been accrued related to uncertain tax positions.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Shareholders' Equity [Abstract]
Shareholders' Equity	 Note 1 4 : Shareholders’ Equity  We have reserved for issuance 150,000 shares of common stock pursuant to the terms of the Employee Stock Purchase Plan. The Employee Stock Purchase Plan allows our employees to acquire additional common shares through payroll deductions. From July 1999 to August 2009, shares issued out of this plan came from treasury shares, subsequent shares issued came from the reserved shares. As of December 31, 201 6 , 61,115 total shares had been issued and 52,500 total treasury shares had been reissued under this plan. As of December 31, 2015, 59,873 total shares had been issued and 52,500 total treasury shares had been reissued under this plan.  We have reserved 800,000 shares of common stock pursuant to the terms of the 2008 Stock Plan. The 2008 Stock Plan provides selected key employees with the opportunity to acquire common stock. As of December 31, 2016 , 603,545 new shares had been issued and 25,725 treasury shares had been reissued b y the 2008 Stock Plan. As of December 31, 201 5 , 512,101 new shares had been issued an d 25,725 tr easury shares had been reissued by the 2008 Stock Plan.  Stock Repurchase Program – On May 25, 2016, the Board authorized our fourth stock repurchase program since August 2014. The program authorizes the repurchase of up to another 5.0% , or approximately 921,000 shares, of our outstand ing common stock and became effective February 23, 2017, which was the origina l expiration date of the third program. During 2016, we repurchased 1,3 98,026 shares for a total of $2 2.1 million, and since August 2014, we have repurchased a total of 2, 519,584 shares for a total o f $40.8 million. Repurchases under the program are available at the discretion of management based upon market, business, legal, and other factors. Our ability to repurchase our common stock is limited during the time that the Merger is pending. 

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	 Note 1 5 : Earnings per Common Share The following table shows the computation of basic and diluted earnings per common share:      (Dollars in thousands, except earnings per share data) 2016 2015 2014  Numerator:  Net income $ 17,704 $ 17,407 $ 21,030  Earnings allocated to participating securities (279) (258) (253)  Numerator for earnings per common share $ 17,425 $ 17,149 $ 20,777   Denominator:  Denominator for basic earnings per common share 18,660,951 18,975,450 19,417,486  Dilutive effect of stock compensation 205,916 148,059 142,877  Denominator for diluted earnings per common share 18,866,867 19,123,509 19,560,363   Earnings per common share:  Basic $ 0.93 $ 0.90 $ 1.07  Diluted $ 0.92 $ 0.90 $ 1.06  At December 31, 2016 and December 31, 2015, there were 6,573 and 38,145 anti-dilutive restricted stock awards outstanding , respectively . There were no anti-dilutive restricted stock awards outstanding at December 31, 2014.

Capital Requirements and Regula

Capital Requirements and Regulatory Matters	12 Months Ended
	Dec. 31, 2016
Capital Requirements And Regulatory Matters [Abstract]
Capital Requirements And Regulatory Matters	 Note 16 : Capital Requirements and Regulatory Matters  We and Bank SNB are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on our and Bank SNB’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we and Bank SNB must meet specific capital guidelines that involve quantitative measures of our and Bank SNB ’ s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. Our and Bank SNB’s capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings, a nd other factors. Quantitative measures established by regulation to ensure capital adequacy require us and Bank SNB to maintain min imum amounts of Total, Tier I Capital (as defined in the regulations), and CET1 Capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier I Capital (as defined) to average assets (as defined).  Management believes that, as of December 31, 2016 and December 31, 2015, we and Bank SNB met all capital adequacy requirements .  As of December 31, 2016 and December 31, 2015 , Bank SNB was categorized as well-capitalized under the regulatory framework for prompt corrective action. To be categorized as well-capitalized, the Bank must maintain minimum Total risk-based, Tier I risk-based, CET1 risk-based, and Tier I leverag e ratios as set forth in the following table.   A summary of actual capital amounts and ratios as of December 31, 2016 are presented below.     Required to be Considered For Capital  Actual Well-Capitalized Adequacy Purposes  (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio  As of December 31, 2016:  Total CET1 Capital (to risk-weighted assets)  Southwest $ 272,882 12.36 % $ 143,488 6.50 % $ 99,338 4.50 %  Bank SNB 301,023 13.66 143,189 6.50 99,131 4.50  Total Capital (to risk-weighted assets)  Southwest 345,597 15.66 220,751 10.00 176,601 8.00  Bank SNB 328,681 14.92 220,291 10.00 176,232 8.00  Tier 1 Capital (to risk-weighted assets)  Southwest 317,882 14.40 176,601 8.00 132,450 6.00  Bank SNB 301,023 13.66 176,232 8.00 132,174 6.00  Tier 1 Leverage (to average assets)  Southwest 317,882 13.02 122,046 5.00 97,637 4.00  Bank SNB 301,023 12.37 121,686 5.00 97,349 4.00  A summary of actual capital amounts and ratios as of December 31, 2015 are presented below.     Required to be Considered For Capital  Actual Well-Capitalized Adequacy Purposes  (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio  As of December 31, 2015:  Total CET1 Capital (to risk-weighted assets)  Southwest $ 282,737 13.21 % $ 139,122 6.50 % $ 96,316 4.50 %  Bank SNB 291,125 13.65 138,637 6.50 95,980 4.50  Total Capital (to risk-weighted assets)  Southwest 359,300 16.79 214,034 10.00 171,228 8.00  Bank SNB 317,865 14.90 213,288 10.00 170,631 8.00  Tier 1 Capital (to risk-weighted assets)  Southwest 332,468 15.53 171,228 8.00 128,421 6.00  Bank SNB 291,125 13.65 170,631 8.00 127,973 6.00  Tier 1 Leverage (to average assets)  Southwest 332,468 14.41 115,371 5.00 92,297 4.00  Bank SNB 291,125 12.66 114,939 5.00 91,951 4.00  The approval of the Oklahoma State Banking Department and the Federal Reserve Bank is required if the total of all dividends declared by Bank SNB in any calendar year exceeds the total of its net profits of that year combined with its retained net profits of the preceding two years. In addition, Bank SNB may not pay a dividend if, after paying the div idend, Bank SNB would be undercapitalized. 

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2016
Employee Benefits [Abstract]
Employee Benefits	 Note 1 7 : Employee Benefits  We sponsor a 401(k) defined contribution savings plan. The plan permits employees to make salary deferral contributions and Roth deferral contributions and permits us to make matching contributions and nonelective contributions. For salary deferral contributions and Roth deferral contributions, employees may become participants in the plan immediately upon their hire date. For the matching contributions, employees who have completed 30 days of service and have attaine d the age of 21 may become participant s in the plan. For the nonelective contributions, employees who have completed one year of service and have attained the age of 21 may become participant s in the plan. The plan is subject to the Employee Retirement Income Security Act of 1974, as amended. The plan permits participants to make before or after-tax contributions in an amount not exceeding 90 % of eligible compensation and subject to dollar limits from Internal Revenue Service regulations.  Matching contributions and minimum contributions, if any, become vested based on employees’ years of service with us. The vested percentage of matching contributions is determined by employees’ completed years of service: less than one year equals 0% vested, one year equals 33% vested, two years equal 66% vested, and three or more years equal 100% vested. Nonelective contributions and minimum contributions, if any, also become vested based on employees’ years of service with us. The vested percentage of nonelective contributions is determined by employees’ completed years of service: less than two years equal 0% vested, two years equal 20% vested, three years equal 40% vested, four years equal 60% vested, and five or more years equal 100% vested. Employees that terminate employment with us will not be entitled to any portion of their accounts that are not vested. The portion not yet vested will be considered a forfeiture. If the employees returns to work for us before five consecutive one-year breaks in service, the forfeited portions of their accounts may be restored if they repay any distributions received at termination. For those that did not receive a distribution and are reemployed by us, their accounts will automatically be restored.  During 2015 and 2014 , we made an annual nonelective contribution of 3 % of eligible compensation. We made contributions of $0.7 million and $0.6 million in 2015 and 2014, respectively. Effective January 1, 2016, we changed our plan to permit us to make a matching contribution equal to 50% of the first 8% of employees’ pre-tax or Roth salary deferral contributions up to a maximum of 4% of their salaries on an annual basis. We may choose to make a nonelective contribution in an amount in the same ratio that employees’ salaries bear to the total salary of all participants in t he p lan. The amount of the contribution, if any, is determined each plan year and announced to all participants. During 2016, we made matching c ontributions of $ 0.8 million and no nonelective contributions .  Stock Options – We recorded no share-based compensation expense with respect to stock options for the years ended December 31, 2016, 2015, and 2014. The share-based compensation is calculated using the accrual method, which treats each vesting tranche as a separate award and amortizes expense evenly from grant date to vest date for each tranche.  There were no outstanding options as of December 31, 2016 and 2015.  No stock options were exercised in 2016, 2015 and 201 4 .  Restricted Stock - Restricted shares granted as of December 31, 2016, 2015 and 2014 were 546,895 , 462,024 , and 4 53,987 , respectively. We recognized $ 1.5 million for the year ended December 31, 2016 and $ 1.3 million for the year ended December 31, 2015 and $0.6 million for the year ended December 31, 201 4 , in c ompensation expense, related to all restricted shares outstanding. At December 31, 201 6 , there was $ 1.6 million of total unrecognized compensation expense related to restricted shares granted under the 2008 Stock Plan. Of the total unrecognized compensation expense at December 31, 2016, $ 1.0 million will be recognized in 2017, and the remainder will be recognized the following two years.  The 2016 and 2015 grants of restricted stock have a vesting period between one to three years. The r estrictions on the shares expire one year after the award date or upon the earlier to occur of satisfaction of vesting conditions, a change in control of us , or the permanent and total disability or death of the participant. We recognize compensation expense over the restricted period.  Supplemental Executive Retirement Plan – Through the acquisition of Bancshares, we inherited a nonqualified supplemental executive retirement plan for certain officers. The plan is closed to any future employees and is funded by the bank owned life insurance acquired from Bancshares. This plan provides for postretirement salary and life insurance benefits, as determined by the plan document. As of December 31, 2016, the accrued deferred compensation was $1.4 million. 

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	 Note 1 8 : Related Party Transactions  Directors and officers of us and Bank SNB were customers of, and had transactions with , us in the ordinary course of business, and similar transactions are expected in the future. All loans included in such transactions were made on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other persons and in management’s opinion did not involve more than normal risk of loss or present other un favorable features. Certain directors, and companies in which they have ownership interests, had indebtedness to us totaling $ 14.2 m illion an d $ 26.1 million at December 31, 201 6 and 201 5 , respectively. During 201 6 , $ 26.9 million of new loans and advances on existing loans were made to these persons and repayments tot ale d $ 38.9 mill ion. During 2015, $41.2 million of new loans and advances on existing loans were made to these persons and repayments totaled $24.2 million.  At December 31, 2016 and 2015, directors, officers and other related parties had demand, non-interest bearing deposits of $ 1.8 million and $ 2.1 million, respectively, savings and interest-bearing transaction accounts of $ 13.2 million and $ 14.0 million, respectively, and time certificates of deposit of $ 0 and $ 0.5 million, respectively. 

Off Balance Sheet Arrangements,

Off Balance Sheet Arrangements, Commitments, Guarantees, And Contractual Obligations	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies [Abstract]
Off-Balance-Sheet Arrangements, Commitments, Guarantees And Contingencies	 Note 1 9: Off-Balance-Sheet Arrangements, Commitments, Guarantees and Contingencies  Financial Instruments with Off-Balance-Sheet Risk – In the normal course of business, we make use of a number of different financial instruments to help meet the financial needs of our customers. In accordance with U.S. generally accepted accounting principles, these transactions are not presented in the accompanying consolidated financial statements and are referred to as off-balance sheet instruments. These transactions and activities include commitments to extend lines of commercial and real estate mortgage credit and standby and commercial letters of credit. The following table provides a summary of our off-balance sheet financial instruments:     At December 31,  (Dollars in thousands) 2016 2015  Commitments to extend commercial and real estate mortgage credit $ 429,383 $ 446,412  Standby and commercial letters of credit 7,160 6,595  Total $ 436,543 $ 453,007  A loan commitment is a binding contract to lend up to a maximum amount for a specified period of time provided there is no violation of any financial, economic, or other terms of the contract. A standby letter of credit obligates us to honor a financial commitment to a third party should our customer fail to perform. Many loan commitments and most standby letters of credit expire unfunded, and, therefore, total commitments do not represent our future funding obligations. Loan commitments and letters of credit are made under normal credit terms, including interest rates and collateral prevailing at the time, and usually require the payment of a fee by the customer. Commercial letters of credit are commitments generally issued to finance the movement of goods between buyers and sellers. Our exposure to credit loss, assuming commitments are funded, in the event of nonperformance by the other party to the financial instrument is represented by the contractual amount of those instruments. We do not anticipate any material losses as a result of the commitments.  Litigation – In the normal course of business, we are at all times subject to various pending and threatened legal actions. The relie f or damages sought in some of these actions may be substantial. After reviewing pending and threatened actions with counsel, management considers that the outcome of such actions will not have a material adverse effect on our financial position; however, we are not able to predict whether the outcome of such actions may or may not have a material adverse effect on results of operations in a particular future period as the timing and amount of any resolution of such actions and relationship to the future results of operations are not known.  Severance Compensation Plan and Change in Control Agreements – We have adopted a Severance Compensation Plan and a Change of Control Agreement (the “Plan s ”) for the benefit of certain officers and key members of management. The Plan’s purpose is to protect and retain certain qualified employees in the event of a change in control and to reward those qualified employees for loyal service to us by providing severance compensation to them upon their involuntary termination of employment after a change in control of Southwest. At December 31, 2016 , we have not recorded any amounts in the Consolidated Financial Statements relating to the Plan s . If a change of cont rol were to occur, the maximum amount payable to certain officers and key members of management would approximate $ 12.1 million. 

Operating Segments

Operating Segments	12 Months Ended
	Dec. 31, 2016
Operating Segments [Abstract]
Operating Segments	 Note 20 : Operating Segments We operat e four principal segments: Oklahoma Banking, Texas Bankin g, Kansas Banking , and Other Operations. The Oklahoma Banking segment provides deposit and lending services and consists of residential mortgage lending services to customers. Due to its size and the management structure, Colorado Banking is included within Oklahoma Banking. The Texas Banking segment and the Kansas Banking segment provide deposit a nd lending services . Other Operations includes our funds management unit and corporate investments. Prior to the fourth quarter of 201 5 , we disclosed a Mortgage Banking segment , which included 1-4 family mortgages and the available for sale loans. For segment reporting, the Mortgage Banking segment has been combined with and into the Oklahoma Banking segment due to those loans being managed from that location. Prior period numbers have been adjusted to reflect this change. This adjustment has no financial statement impact. The primary purpose of the funds management unit is to manage our overall internal liquidity needs and interest rate risk. Each segment borrows funds from or provides funds to the funds management unit as needed to support its operations.  The value of funds provided to and the cost of funds borrowed from the funds management unit by each segment are internally priced at rates that approximate market rates for funds with similar duration. The yield used in the funds transfer pricing curve is a blend of rates based on the volume usage of retail and brokered certificates of deposit and FHLB advances. The accounting policies of each reportable segment are the same as ours . Expenses for consolidated back-office operations are allocated to operating segments based on estimated uses of those services. General overhead expenses such as executive administration, accounting, and audit are allocated based on the direct expense and/or deposit and loan volumes of the operating segment. Income tax expense for the operating segments is calculated at statutory rates. The Other Operations segment records the tax expense or benefit necessary to reconcile to the consolidated financial statements. Capital is assigned to each of the segments using a risk-based capital pricing methodology that assigns capital ratios by asset, deposit, or revenue category based on credit risk, interest rate risk, market risk, operational risk, and liquidity risk factors . There were no significant changes in 2016 due to funds transfer pricing, capital assignments, or expense allocations.  The following table summarizes financial results by operating segment:    For the year ended December 31, 2016  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company   Net interest income $ 50,590 $ 22,697 $ 6,694 $ (538) $ 79,443  Provision for loan losses 2,007 973 1,786 3 4,769  Noninterest income 11,576 1,273 1,202 2,034 16,085  Noninterest expenses 40,083 13,734 5,275 4,154 63,246  Income (loss) before taxes 20,076 9,263 835 (2,661) 27,513  Taxes on income 7,157 3,303 298 (949) 9,809  Net income (loss) $ 12,919 $ 5,960 $ 537 $ (1,712) $ 17,704   * Includes externally generated revenue of $3.0 million, primarily from investing services, and an internally generated loss of $1.5 million from the funds management unit.   Total loans at period end $ 1,095,930 $ 636,643 $ 144,559 $ - $ 1,877,132  Total assets at period end 1,138,969 633,328 143,558 559,537 2,475,392  Total goodwill at period end 12,525 1,020 - - 13,545  Total deposits at period end 1,330,176 195,603 147,823 272,416 1,946,018     For the year ended December 31, 2015  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company   Net interest income $ 42,019 $ 21,168 $ 6,277 $ (2,047) $ 67,417  Provision (credit) for loan losses (2,068) (632) (868) 2 (3,566)  Noninterest income 10,134 1,485 1,473 1,365 14,457  Noninterest expenses 33,136 14,324 6,152 4,628 58,240  Income (loss) before taxes 21,085 8,961 2,466 (5,312) 27,200  Taxes on income 7,591 3,227 888 (1,913) 9,793  Net income (loss) $ 13,494 $ 5,734 $ 1,578 $ (3,399) $ 17,407   * Includes externally generated revenue of $2.1 million, primarily from investing services, and an internally generated loss of $2.8 million from the funds management unit.   Total loans at period end $ 1,048,473 $ 580,476 $ 150,480 $ - $ 1,779,429  Total assets at period end 1,098,735 578,749 149,847 529,691 2,357,022  Total goodwill at period end 12,447 1,020 - - 13,467  Total deposits at period end 1,374,227 209,146 119,313 181,419 1,884,105     For the year ended December 31, 2014  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company   Net interest income $ 38,846 $ 19,187 $ 9,469 $ (2,498) $ 65,004  Provision (credit) for loan losses (2,561) (3,640) (425) 2 (6,624)  Noninterest income 9,030 1,594 1,576 6,731 18,931  Noninterest expenses 31,363 13,387 8,616 3,546 56,912  Income before taxes 19,074 11,034 2,854 685 33,647  Taxes on income 7,152 4,138 1,070 257 12,617  Net income $ 11,922 $ 6,896 $ 1,784 $ 428 $ 21,030   * Includes externally generated revenue of $7.6 million, primarily from investing services, and an internally generated loss of $3.3 million from the funds management unit.   Total loans at period end $ 793,262 $ 460,680 $ 146,043 $ 6 $ 1,399,991  Total assets at period end 805,704 458,489 147,256 530,585 1,942,034  Total goodwill at period end 194 1,020 - - 1,214  Total deposits at period end 1,113,477 224,634 110,901 84,987 1,533,999   

Parent Company Condensed Financ

Parent Company Condensed Financial Information	12 Months Ended
	Dec. 31, 2016
Parent Company Condensed Financial Information [Abstract]
Parent Company Condensed Financial Information	 Note 21: Parent Company Condensed Financial Information  Following are the condensed financial statements of Southwest Bancorp, Inc. (“Parent Company only”) for the periods indicated:    At December 31,  (Dollars in thousands) 2016 2015  Statements of Financial Condition  Assets:  Cash and cash equivalents $ 12,105 $ 30,469  Investment in subsidiary banks 315,181 305,064  Investments in other subsidiaries 2,084 8,444  Other assets 5,499 6,393  Total $ 334,869 $ 350,370   Liabilities:  Subordinated debentures 46,393 51,548  Other liabilities 1,847 2,724  Shareholders' Equity:  Common stock and related accounts 286,629 296,098  Total $ 334,869 $ 350,370      For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Statements of Operations  Income:  Cash dividends from subsidiaries $ 10,052 $ 20,046 $ 18,045  Noninterest income 25 45 34  Investment income - 20 1,337  Other operating income 15 25 3  Security gains - 163 -  Total income 10,092 20,299 19,419  Expense:  Interest on subordinated debentures 1,740 1,566 1,505  Noninterest expense 2,191 1,756 1,317  Total expense 3,931 3,322 2,822  Total income before taxes and equity in  undistributed income of subsidiaries 6,161 16,977 16,597  Taxes on income (1,377) (1,167) (582)  Income before equity in undistributed  income of subsidiaries 7,538 18,144 17,179  Equity in undistributed income (loss) of subsidiaries 10,166 (737) 3,851  Net income $ 17,704 $ 17,407 $ 21,030    For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Statements of Cash Flows  Operating activities:  Net income $ 17,704 $ 17,407 $ 21,030  Equity in undistributed (income) loss of subsidiaries (10,166) 737 (3,851)  Other, net 6,823 2,295 2,937  Net cash provided by operating activities 14,361 20,439 20,116  Investing activities:  Available for sale securities:  Purchases - - (1,121)  Sales / Maturities - 750 2,540  Outlays for business acquisitions - (4,697) -  Other, net - (155) -  Net cash provided by (used in) investing activities - (4,102) 1,419  Financing activities:  Net proceeds from issuance of common stock 1,239 682 1,386  Purchases of treasury stock (22,721) (8,624) (10,302)  Common stock dividend (6,088) (4,607) (3,132)  Other, net (5,155) 5,155 -  Net cash used in financing activities (32,725) (7,394) (12,048)  Net increase (decrease) in cash and cash equivalents (18,364) 8,943 9,487  Cash and cash equivalents,  Beginning of year 30,469 21,526 12,039  End of year $ 12,105 $ 30,469 $ 21,526  

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies [Abstract]
Commitments and contingencies	 N ote 22: Commitments and Contingencies  Customer Risk Management Interest Rate Swap  On September 9, 2014, we entered into an agreement to provide one of our commercial borrowers a customer interest rate swap that effectively converts the loan interest rate from floating rate based on LIBOR to a fixed rate for the customer. As of December 31, 201 6 , the floating rate loan had an outstanding balance of $ 14.7 million . The option to execute the swap is conditional on compliance with the loan and swap agreements, and will be subject to the terms of the International Swaps and Derivatives Association Master Agreement. The fixed pay amount will be based on the market rates at the time of execution, and it is our intention to simultaneously execute an offsetting trade with an approved swap dealer counterparty with identical terms.  We have seven risk participation agreements with financial institution counterparties for interest rate swaps related to loans in which we are a participant. The risk participation agreements provide credit protection to the financial institution should the borrower fail to perform on its interest rate derivative contract with the financial institution. As of December 31, 2016, the current notional amount for these seven transactions total $34.7 million.  Legal Action  On March 18, 2011 , an action entitled Ubaldi, et al. v SLM Corporation (“Sallie Mae”), et al., Case No. 3:11-cv-01320 EDL (the “Ubaldi Case”) was filed in the U.S. District Court for the Northern District of California as a putative class action with respect to certain loans that the plaintiffs claim were made by Sallie Mae. The loans in question were made by various banks, including Bank SNB, and sold to Sallie Mae. Plaintiffs claim that Sallie Mae entered into arrangements with chartered banks in order to evade California law and that Sallie Mae is the de facto lender on the loans in question and, as the lender on such loan, Sallie Mae charged interest and late fees that violates California usury law and the California Business and Professions Code. Sallie Mae has denied all claims asserted against it and has stated that it intends t o vigorously defend the action. On March 26, 2014, the Court denied the plaintiffs’ request to certify the class; however, the Court permitted the plaintiffs to amend the filing to redefine the class. Plaintiffs filed a renewed motion on June 23, 2014. On December 19, 2014, the Court issued a decision on the renewed motion, certifying a class with respect to claims of improper late fees, but denying class certification with respect to plaintiffs’ usury claims. Plaintiffs thereafter filed a motion seeking leave to amend their complaint to add additional parties, which Sallie Mae opposed, and, on March 24, 2015, the Court denied the plaintiffs’ motion. On June 5, 2015, the law firm Cohen Milstein Sellers & Toll based in Washington, D.C. entered its appearance as co-counsel on behalf of plaintiffs.  Bank SNB is not spec ifically named in the action. However, in the first quarter of 2014, Sallie Mae provided Bank SNB with a notice of claims that have been asserted against Sallie Mae in the Ubaldi Case (the “Notice”). Sallie Mae asserts in the Notice that Bank SNB may have indemnification and/or repurchase obligations pursuant to the ExportSS Agreement dated July 1, 2002 between Sallie Mae and Bank SNB, pursuant to which the loans in question were made by Bank SNB. Bank SNB has substantial defenses with respect to any claim for indemnification or repurchase ultimately made by Sallie Mae, if any, and intends to vigorously defend against any such claims.  Due to the uncertainty regarding (i) the size and scope of the class, (ii) the particular class members, (iii) the late fees charged to particular class members, (iv) the theories, if any, under which the plaintiffs might prevail, (v) whether Sallie Mae will make a claim against us for indemnification or repurchase, and (vi) the likelihood that Sallie Mae would prevail if it makes such a claim, we cannot estimate the amount or the range of losses that may arise as a result of the Ubaldi Case.  In the normal course of business, we are at all times subject to various pending and threatened legal actions. The relief or damages sought in some of these actions may be substantial. After reviewing pending and threatened actions with counsel, management currently does not expect that the outcome of such actions will have a material adverse effect on our financial position; however, we are not able to predict whether the outcome of such actions may or may not have a material adverse effect on results of operations in a particular future period as the timing and amount of any resolution of such actions and relationship to the future results of operations are not known. 

New Authoritative Accounting Gu

New Authoritative Accounting Guidance	12 Months Ended
	Dec. 31, 2016
New Authoritative Accounting Guidance [Abstract]
New Authoritative Accounting Guidance	 Note 2 3 : New Authoritative Accounting Guidance  In May 2014, the FASB issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) , which establishes a five-step model that entities must follow to recognize revenue. The guidance would have become effective for us on January 1, 2017. However, in August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606)—Deferral of the Effective Date , which deferred the effective date of ASU 2014-09 by one year. The guidance will now become effective for us on January 1, 2018, and is not expected to have a material impact on our financial statements and disclosures.  In J anuary 2016, the FASB issued ASU 2016-01, Recognition and Measurements of Financial Assets and Financial Liabilities . This ASU requires that all equity investments be measured at fair value with changes in the fair value recognized through net income (other than those accounted for under the equity method of accounting or those that result in consolidation of the investee). This ASU also requires that an entity present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. In addition, this ASU eliminates the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities and the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet for public business entities. The guidance becomes effective for us on January 1, 2018, and we are evaluating the impact of this ASU on our financial statements and disclosures.  In February 2016, the FASB issued ASU 2016-02, Leases . This ASU requires lessees to put most leases on their balance sheets but recognize expenses in the income statement in a manner similar to current accounting treatment. This ASU changes the guidance on sale-leaseback transactions, initial direct costs and lease execution costs, and, for lessors, modifies the classification criteria and the accounting for sales-type and direct financing leases. The guidance becomes effective for us on January 1, 2019. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are evaluating the impact of this ASU on our financial statements and disclosures.  In March 2016, the FASB issued ASU 2016-05, Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships . This ASU clarifies that a change in the counterparty of a derivative contract (i.e., a novation) in a hedge accounting relationship does not, in and of itself, require dedesignation of the hedge accounting relationship. This guidance becomes effective for us on January 1, 2017, and it is not expected to have a material impact on our financial statements and disclosures .  In March 2016, the FASB issued ASU 2016-06, Contingent Put and Call Options in Debt Instruments . This ASU clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under this ASU is required to assess the embedded call (put) options solely in accordance with the four-step decision sequence. The amendments apply to all entities that are issuers of or investors in debt instruments (or hybrid financial instruments that are determined to have a debt host) with embedded call (put) options. This guidance becomes effective for us on January 1, 2017, and it is not expected to have a material impact on our financial statements and disclosures .  In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting . This ASU simplifies several aspects of the accounting for employee 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. This guidance becomes effective for us on January 1, 2017, and it is not expected to have a material impact on our financial statements and disclosures .  In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing . While this ASU does not change the core principles of the guidance in Topic 606, it does clarify the guidance related to identifying performance obligations as well as the accounting for licenses of intellectual property. This guidance becomes effective for us on January 1, 2017, and it is not expected to have a material impact on our financial statements and disclosures .  In May 2016, the FASB issued ASU 2016-11, Revenue Recognition (Topic 605) and Derivatives Hedging (Topic 815), Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting (SEC Update) . This ASU rescinds from the FASB Accounting Standards Codification certain SEC Observer comments that are codified in FASB ASC Topic 605, Revenue Recognition , and ASC 932, Extractive Activities – Oil and Gas , effective upon an entity’s adoption of FASB ASC 606, Revenue from Contracts with Customers . This ASU also rescinds the SEC Staff Announcement: Determining the Nature of a Host Contract Related to a Hybrid Instrument Issued in the Form of a Share under Topic 815,” which is codified in FASB ASC Topic 815, Derivatives and Hedging , effective on adoption of FASB ASU 2014-16, Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or Equity . This guidance becomes effective for us on January 1, 2018, and it is not expected to have a material impact on our financial statements and disclosures .  In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606), Narrow-Scope Improvements and Practical Expedients . While this ASU does not change the core principles of the new revenue recognition standard, it does make the standard more operational and clarifies the guidance on assessing collectability, presenting sales taxes, measuring noncash consideration, and certain transition matters. This guidance becomes effective for us on January 1, 2018, and it is not expected to have a material impact on our financial statements and disclosures .  In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . This ASU replaces the incurred loss impairment methodology in current GAAP with a methodology that estimates credit losses on most financial instruments measured at amortized cost, such as loans, receivables, and held-to-maturity securities, using the current expected credit loss (CECL) model. Under this model, entities will estimate credit losses over the financial instrument’s entire contractual term from the date of initial recognition of that instrument. The ASU also requires incremental disclosures on how the entity developed its estimates. This guidance becomes effective for us on January 1, 2020. We are evaluating the impact of this ASU on our financial statements and disclosures.  In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) , which is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The new guidance specifically addresses eight classification issues: debt prepayment or debt extinguishment costs; settlement of zero-coupon bonds; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance (COLI) policies, including bank-owned life insurance (BOLI) policies; distributions received from equity method investments; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. This guidance becomes effective for us on January 1, 2018. We are evaluating the impact of the ASU on our financial statements and disclosures.  In October 2016, the FASB issued ASU 2016-16 , Income Taxes (Topic 7 40): Intra-Entity Transfers of Assets Other than Inventory . The ASU requires companies to recognize the income tax consequences of an intercompany asset transfer when the transfer occurs. The amendments in this ASU do not change accounting for the pre-tax effects of intra-entity asset transfers under Topic 810, Consolidation , and do not apply to intra-entity inventory transfers. The economic consequences of intra-entity asset sales—other than inventory—will be recognized in the period in which the transaction occurs and no longer deferred. A reporting entity’s effective tax rate likely will be affected due to the immediate recognition of the seller’s taxes and buyer’s deferred taxes, particularly when the transaction has no effect on consolidated pre-tax income. This guidance becomes effective for us on January 1, 2018. We are evaluating the impact of this ASU on our financial statement disclosures.  In January 2016, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business , which provides guidance on evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance is generally expected to result in fewer transactions qualifying as business combinations. Under the new guidance, an entity first determines whether substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets. If this threshold is met, the set is not considered a business. If this threshold is not met, a set cannot be considered a business unless it includes an input and a substantive process that together significantly contribute to the ability to create outputs. This guidance becomes effective for us on January 1, 2018, and is not expected to have a material impact on our financial statements and disclosures. 

Summary Of Significant Accoun32

Summary Of Significant Accounting And Reporting Policies	12 Months Ended
	Dec. 31, 2016
Significant Accounting And Reporting Policies [Abstract]
Organization and Nature of Operations	Organization and Nature of Operations – Southwest Bancorp Inc. (“we”, “our”, “us”, or “Southwest”), incorporated in 1981, is a financial holding company headquartered in Stillwater, Oklahoma engaged primarily in commercial and retail financial services in the states of Oklahoma, Texas, Kansas , and Colorado . The accompanying consolidated financial statements include the accounts of Bank SNB, an Oklahoma banking corporation established in 1894, and the consol idated subsidiaries of Bank SNB . Bank SNB is a w holly owned, direct subsidiary of ours. All significant intercompany balances and transactions have been eliminated in consolidation.  On October 9, 2015, we completed the acquisition of Bancshares through the m erger of Bancshares with and into us. The Bancshares Merger was consummated pursuant to the Bancshares Merger Agreement dated as of May 27, 2015. The Bancshares Merger expanded our presence in the Oklahoma City metro ar ea with five additional banking centers , increasing o ur total to ten . It also expanded our geographic footprint to Colorado with three full-service banking centers and one loan production office in Denver.
Basis of Presentation	Basis of Presentation – The accounting and reporting policies conform to accounting principles generally accepted in the United States and to generally accepted practices within the banking industry. The Consolidated Financial Statements include the accounts of Southwest and all other entities in which we have a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation.  Certain reclassifications have been made to prior year amounts on the Consolidated Statements of Operations to conform to current year presentation.  We have evaluated subsequent events for potential recognition and disclosure through the issue date of the Consolidated Financial Statements included in this Annual Report on Form 10-K.
Management Estimates	Management Estimates – In preparing our financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilitie s as of the dates shown on the Consolidated Statements of Financial C ondition and revenues and expenses during the periods reported. Actual results could differ significantly from those estimates. Changes in economic conditions could affect the determination of material estimates such as the allowance for loan losses, the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, income taxes, and the fair value of financial instruments.
Cash and Cash Equivalents	Cash and Cash Equivalents – For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from depository institutions, and federal funds sold. Interest-bearing balances held at depository institutions were $ 38.8 million at December 31, 2016 and $ 53.2 million at December 31, 2015. Federal funds sold are sold for one-to-four day periods.  C ash paid for interest totaled $ 9.7 million i n 201 6 , $ 7.0 million in 201 5 , and $ 6.9 million in 201 4 . Cash paid for income taxes totale d $ 9.4 million in 2016, $ 7.1 million in 2015, and $ 4.0 million in 2014. Noncash transactions included stock issued for the acquisition of Bancshares of $21.4 million in 2015 and transfer of loans to other real estate t otaling $ 0.5 million in 2016 and $ 0.3 million in 2015 and $2.2 million in 2014.  Bank SNB is required by the FRB to maintain average reserve balances. Cash and cash equivalents in the Consolidated Statements of Financial Condition include restricted amounts of $ 1.0 million and $ 7.0 million at December 31, 201 6 and December 31, 201 5 , respectively. 
Investment Securities	 Investment Securities – Investments in debt and equity securities are identified as held to maturity or available for sale based on management considerations of asset/liability strategy, changes in interest rates and prepayment risk, the need to increase liquidity, and other factors, including management’s intent and ability to hold securities to maturity. We have the ability and intent to hold to maturity our investment securities classified as held to maturity. We had no investments held for trading purposes for any period presented. Under certain circumstances (including the deterioration of the issuer’s creditworthiness, a change in tax law, or statutory or regulatory requirements), we may change the investment security classification. The classifications we utilize determine the related accounting treatment for each category of investments. Available for sale securities are accounted for at fair value with unrealized gains or losses, net of taxes, excluded from operations and reported as accumulated other comprehensive income or loss. Held to maturity securities are accounted for at amortized cost. Securities with limited marketability, such as FRB stock, FHLB stock, and certain other investments, are carried at cost and included in other assets.  All investment securities are adjusted for amortization of premiums and accretion of discounts. Amortization of premiums and accretion of discounts are recorded to operations over the contractual maturity or estimated life of the individual investment using the level yield method. Gain or loss on sale of investments is based upon the specific identification method. Income earned on our investments in state and political subdivisions generally is not subject to ordinary Federal income tax.  In accordance with authoritative accounting guidance under ASC 320, Debt and Equity Securities , declines in fair value of held-to-maturity and available-for-sale securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. Under this guidance, we evaluate investment securities for other-than-temporary impairment on at least a quarterly basis, or more frequently when economic or market conditions warrant such an evaluation.
Federal Reserve Bank and Federal Home Loan Bank Stock	Federal Reserve Bank and Federal Home Loan Bank Stock – Bank SNB is a m ember of its regional FRB and FHLB system. FHLB members are required to own a certain amount of stock based on the level of borrowings a nd other factors, and may invest in additional accounts. Both FRB and FHLB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Loans	Loans – Interest on loans is accrued and credited to operations based upon the principal amount outstanding. Loan origination fees and certain costs of originated loans are amortized as an adjustment to the yield over the term of the loan. Net unamortized deferred loan fees wer e $ 2.5 million at December 31, 201 6 and $1.5 million at 201 5 . Loans are reported at the principal balance outstanding net of the unamortized deferred loan fees.  In general, our policy for nonaccrual loans requires that accrued interest income on nonaccrual loans is written off after the loan is 90 days past due, and that subsequent interest income is recorded when cash receipts are received from the borrower. We identify past due loans based on contractual terms on a loan by loan basis.  A loan is considered to be impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. The allowance for loan losses related to loans that are evaluated for impairment is based either on the discounted cash flows using the loan’s initial effective interest rate or on the fair value of the collateral for certain collateral dependent loans. Smaller balance, homogeneous loans, including mortgage, and consumer, are collectively evaluated for impairment. This evaluation is inherently subjective as it requires material estimates including the amounts and timing of future cash flows expected to be received on impaired loans that may be susceptible to significant change.  Loans Held for Sale -- We originate real estate mortgage loans for either portfolio investment or sale in the secondary market. During the period of origination, real estate mortgage loans are designated as held either for investment purposes or sale. Mortgage loans held for sale are generally sold within a one-month period from loan closing at amounts determined by the investor commitment based upon the pricing of the loan.
Loans Acquired through Business Combination with Deteriorated Credit Quality	Loans Acquired through Business Combination with Deteriorated Credit Quality – The accounting guidance of ASC 310.30, Loan and Debt Securities Acquired with Deteriorated Credit Quality , applies to loans acquired in a business combination that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that we will be unable to collect all contractually required payment receivables. In accordance with this guidance, these loans are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield”, is recognized as interest inc ome over the life of the loan using a method that approximates the level-yield method. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acqui sition, or the “nonaccretable difference”, are not recognized as a yield adjustment, a loss accrual, or a valuation allowance. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairments. Valuation allowances on these impaired loans reflect only losses incurred after the acquisition.
Allowance for Loan Losses	Allowance for Loan Losses – The allowance for loan losses is a reserve established through a provision for loan losses charged to operations. Loan amounts which are determined to be uncollectible are charged against this allowance, and recoveries, if any, are added to the allowance. The appropriate amount of the allowance is based on continuous review and evaluation of the loan portfolio and ongoing, quarterly assessments of the probable losses inherent in the loan portfolio. The allowance for loan losses is determined in accordance with regulatory guidelines and generally accepted accounting principles and is comprised of two primary components, specific and general. Allocations of the allowance for loan losses may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off.  The specific component relates to loans that are individually classified as impaired. Loans deemed to be impaired are evaluated on an individual basis consistent with ASC 310.10.35, Receivables: Subsequent Measurement . The amount and level of the impairment allowance is ultimately determined by management’s estimate of the amount of expected future cash flows or, if the loan is collateral dependent, on the value of the collateral, which may vary from period to period depending on changes in the financial condition of the borrower or changes in the estimated value of the collateral. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and deemed as impaired, and classified as nonperforming, potential problem, or performing restructured as applicable. Charge-offs against the allowance for impaired loans are made when and to the extent the loan is deemed uncollectible.  The general component of the allowance is calculated based on ASC 450, Contingencies . Loans not evaluated for specific allowance are segmented into loan pools by type of loan. The commercial real estate and real estate construction pools are further segmented by the market in which the loan collateral is located. Our primary markets are Oklahoma, Texas, Kansas , and Colorado , and loans secured by real estate in those states are included in the “in-market” pool, with the remaining defaulting to the “out-of-market” pool. Estimated allowances are based on historical loss trends with adjustments factored in based on qualitative risk factors both internal and external to us. The historical loss trend is determined by loan pool and segmentation and is based on the actual loss history experienced by us over the most recent three years. The qualitative risk factors include, but are not limited to, economic and business conditions, changes in lending staff, lending policies and procedures, quality of loan review, changes in the nature and volume of the portfolios, loss and recovery trends, asset quality trends, and legal and regulatory considerations.  Independent appraisals on real estate collateral securing loans are obtained at origination. New appraisals are obtained periodically and upon discovery of factors that may significantly affect the value of the collateral. Appraisals usually are received within 30 days of request. Results of appraisals on nonperforming and potential problem loans are reviewed promptly upon receipt and also are reviewed monthly and considered in the determination of the allowance for loan losses. We are not aware of any significant time lapses in the process that have resulted, or would result in, a significant delay in determination of a credit weakness, the identification of a loan as nonperforming, or the measurement of an impairment.  Management strives to carefully monitor credit quality and to identify loans that may become nonperforming. At any time, however, there are loans included in the portfolio that will result in losses but that have not been identified as nonperforming or potential problem loans. Because the loan portfolio contains a significant number of commercial and commercial real estate loans with relatively large balances, the unexpected deterioration of one or a few of such loans may cause a significant increase in nonperforming assets and may lead to a material increase in charge-offs and the provision for loan losses in future periods.
Liability for Credit Losses on Unfunded Loan Commitments	Liability for Credit Losses on Unfunded Loan Commitments – Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.  The reserve for unfunded loan commitments is a liability on our C onsolidated S tatement s of F inancial C ondition in other liabilities. The reserve is computed using a methodology similar to that used to determine the allowance for loan losses, modified t o take into account the probability of a drawdown on the commitment. At December 31, 201 6 and 201 5, the balance s were $ 2.5 mill ion and $2.4 million, respectively .
Premises and Equipment	Premises and Equipment – Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are recorded on a straight-line basis over the estimated useful life of each asset. Useful liv es range from 10 years to 40 years for buildings and improvements, and 3 years to 10 years for furniture, fixtures, and equipment. We review the carrying value of long-lived assets used in operations when changes in events or circumstances indicate that the assets might have become impaired. If circumstances required, the review would initially include a comparison of carrying value to the undiscounted cash flows estimated to be generated by those assets. If this review indicates that an asset is impaired, we would record a charge to operations to reduce the asset’s carrying value to fair value, which is based on estimated discounted cash flows. Long-lived assets that are held for disposal are valued at the lower of the carrying amount or fair value less costs to sell.
Other Real Estate	Other Real Estate – Assets acquired through or instead of loan foreclosure are considered other real estate. Other real estate is initially recorded at the lesser of the carrying value or fair value less the estimated costs to sell the asset. Write-downs of carrying value required at the time of foreclosure are recorded as a charge to the allowance for loan losses. Costs related to the development of such real estate are capitalized, and costs related to holding the property are expensed. Foreclosed property is subject to periodic revaluation based upon estimates of fair value. In determining the valuation of other real estate, management obtains independent appraisals for significant properties. Valuation adjustments are provided, as necessary, by charges to operations. Profits and losses from operations or sales of foreclosed property are recognized as incurred . At December 31, 201 6 and 201 5 , the balances of other real estate w ere $ 0 . 4 m illion and $ 2.3 million, respectively.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets – Intangible assets consist of goodwill, core deposit intangibles, and loan servicing rights. Goodwill and core deposit intangibles, which generally result from a business combination, are accounted for under the provisions of ASC 350, Intangibles - Goodwill and Other , and ASC 805, Business Combinations. Loan servicing rights are accounted for under the provisions of ASC 860, Transfers and Servicing .  Goodwill represents the excess of the cost of businesses acquired over the fair value of the net assets acquired and is assigned to reporting units. Goodwill is not amortized, but is tested for impairment at least annually or more frequently if conditions indicate impairment may exist . The evaluation of possible impairment involves significant judgment based upon short-term and long-term projections of future performance of each reporting unit.  Core deposit intangibles are amortized using an economic life method based on deposit attrition. As a result, amortization will decline over time with most of the amortization occurring during the initial years. The net book value of core deposit intangibles is adjusted for applicable branch sales, if any, and is evaluated for impairment when economic conditions indicate impairment may exist.  When real estate mortgage loans and other loans are sold with servicing retained, an intangible servicing right is initially capitalized based on estimated fair value at the point of origination with the income statement effect recorded in gains on sales of loans. The servicing rights are amortized over the period of estimated net servicing income. Impairment of loan servicing rights is assessed based on the fair value of those rights. We review the carrying value of loan servicing rights quarterly for impairment. At least annually, we obtain estimates of fair value from outside sources to corroborate the results of the valuation model. At December 31, 201 6 and 201 5 , the fair values of loan servicing rights were $4.2 million and $ 3.7 mi llion , respectively .
Fair Value Measurements	Fair Value Measurements – ASC 820, Fair Value Measurements , defines fair value, establishes a framework for measuring fair value in accordance with generally accepted accounting principles, and expands disclosures about fair value measurements. In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parame ters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and our creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time.
Derivative Financial Instruments	Derivative Financial Instruments – Our derivative credit risk policy and our hedging policy permits the use of various derivative financial instruments to manage interest rate risk or to hedge specified assets and liabilities. All derivatives are recorded at fair value on our balance sheet.  To qualify for hedge accounting, derivatives must be highly effective at reducing the risk associated with the exposure being hedged and must be designated as a hedge at the inception of the derivative contract. We consider a hedge to be highly effective if the change in fair value of the derivative hedging instrument is within 80 % to 125 % of the opposite change in the fair value of the hedged item attributable to the hedged risk. If derivative instruments are designated as hedges of fair values, and such hedges are highly effective, both the change in the fair value of the hedge and the hedged item are included in current earnings. Fair value adjustments related to cash flow hedges are recorded in other comprehensive income and are reclassified to earnings when the hedged transaction is reflected in earnings. Ineffective portions of hedges are reflected in earnings as they occur. Actual cash receipts and/or payments and related accruals on derivatives related to hedges are recorded as adjustments to the interest income or interest expense associated with the hedged item. During the life of the hedge, we will formally assess whether derivatives designated as hedging instruments continue to be highly effective in offsetting changes in the fair value or cash flows of hedged items. If it is determined that a hedge has ceased to be highly effective, we will discontinue hedge accounting prospectively. At such time, previous adjustments to the carrying value of the hedged item are reversed into current earnings and the derivative instrument is reclassified to a trading position recorded at fair value.  Our qualified customers have the opportunity to participate in our interest rate swap program for the purpose of managing interest rate risk on their variable rate loans with us. If we enter into such agreements with customers, then offsetting agreements are executed between us and approved dealer counterparties to minimize our market risk from changes in interest rates. The counterparty contracts are identical to customer contracts in terms of notional amounts, interest rates, and maturity dates , except for a fixed pricing spread or fee paid to us by the dealer counterparty. These interest rate swaps carry varying degrees of credit, interest rate and market or liquidity risks. The fair value of such derivative instruments are recognized as either non-hedge derivative assets or liabilities in the Consolidated Statements of Financial C ondition.
Loan Servicing Income	Loan Servicing Income – We earn fees for servicing real estate mortgages and other loans owned by others. These fees are generally calculated on the outstanding principal balance of the loans serviced and are recorded as income when earned.
Taxes on Income	Taxes on Income – We file consolidated income tax returns with our subsidiaries. Income tax expense is the total of the current year income tax due or refundable, adjusted for permanent differences between items reported in the financial statements and those reported for tax purposes and the change in deferred tax assets and liabilities. Under the asset and liability method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statements and tax basis of assets and liabilities using the enacted tax rates in effect for the year in which the differences are expected to reverse. The net deferred tax asset is reflected as a co mponent of other assets on the C onsolidated Statements of Financial Condition .  A valuation allowance, if needed, reduces deferred tax assets to the expected amount most likely to be realized. Realization of deferred tax assets is dependent upon the generation of a sufficient level of future taxable income and recoverable taxes paid in prior years. We recognize net deferred tax assets to the extent that we believe these assets are more likely than not to be realized. In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and result s of recent operations. Management reviewed all evidence and concluded that a valuation allowance was not needed.
Earnings per Common Share	Earnings per Common Share – ASC 260 , Earnings Per Share , provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share pursuant to the two-class method. We ha ve determined that our unvested restricted stock awards are participating securities. Accordingly, earnings per common share is computed using the two-class method prescribed by ASC 260. Using this method, basic earnings per common share is computed based upon net income available to common shareholders divided by the weighted average number of common shares outstanding during each period, which exclude the outstanding unvested restricted stock. Diluted earnings per share is computed using the weighted average number of common shares determined for the basic earnings per common share computation plus the dilutive effect of restricted stock awards using the treasury stock me thod. Restricted stock awards , where the exercise price was greater than the average market price of common shares, were not included in the computation of earnings per diluted share as they would have been ant i-dilutive. At December 31, 2016 and 2015, there were 6,573 and 38,145 anti-dilutive restricted stock awards outstanding , respectively.  A reconciliation of the weighted-average common shares used in the calculations of basic and diluted earnings per common share for the reported periods is provided at “ Note 1 5: Earnings per Common Share ” on page 86 .
Share-Based Compensation	Share-Based Compensation – The Southwest Bancorp, Inc. 2008 Stock Based Award Plan (the “2008 Stock Plan”), provides selected key employees with the opportunity to acquire common stock through stock options or restricted stock awards. Compensation cost is recognized based on the fair value of these awards at the date of grant. The exercise price of all options granted under the 2008 Stock Plan is the fair market value on the grant date, while the market price of our common stock at the date of grant is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. Depending upon terms of the stock option agreements, stock options generally become exercisable on an annual basis and expire from five to ten years after the date of grant.  The 2008 Stock Plan authorized awards for up to 800,000 shares of our common stock over its ten -year term.
Comprehensive Income	Comprehensive Income – Our comprehensive income (net income plus all other changes in shareholders’ equity from non-equity sources) consists of our net income, the after tax effect of changes in the net unrealized gains (losses) in our available for sale securities, reclassification adjustments for net (gains) losses, and changes in the accumulated gain (loss) on the effective cash flow hedging instrument.  Simmons First National Corporation (Pending Merger) – On December 14, 2016, we entered into a Merger Agreement with Simmons, an Arkansas corporation, pursuant to which, and subject to its terms and conditions, Simmons will acquire all of our outstanding capital stock for $95.0 million in cash and 7,250,000 shares of Simmons’s common stock, representing an aggregate Merger consideration of approximately $564.4 million (based on Simmons’ common stock closing price as of December 13, 2016), subject to potential adjustments.  Simmons conducts banking operations through 150 financial centers located in communities throughout Arkansas, Kansas, Missouri and Tennessee. As of December 31, 2016, Simmons had $8.4 billion in total assets, $5.6 billion in loans and $6.7 billion in deposits. The completion of the Merger is subject to, among other things, regulatory and shareholder approval and other customary closing conditions. 

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2016
Acquisitions [Abstract]
Reconciliation Of Cash Received From The Acquisition	  (Dollars in thousands)  Fair value of assets acquired $ 301,499  Liabilities assumed (259,718)  Net assets acquired 41,781  Stock issued as consideration (21,366)  Cash acquired (32,699)  Cash received in business combination, net of cash paid $ (12,284) 
Schedule Of Assets Acquired And Liabilities Assumed	  First Commercial Bancshares, Inc.  Acquired from Bancshares Fair Value Adjustments Fair Value  (Dollars in thousands)  Assets, Acquired  Cash and due from banks $ 5,874 $ - $ 5,874  Interest-bearing deposits with other banks 17,196 - 17,196  Federal funds sold 9,629 - 9,629  Cash and cash equivalents 32,699 - 32,699  Investment securities 34,762 (184) 34,578  Loans 210,223 (7,790) 202,433  Allowance for loan losses 4,298 (4,298) -  Total loans receivable 205,925 (3,492) 202,433  Bank premises and equipment, net 4,241 1,341 5,582  Cash value of life insurance 7,153 - 7,153  Accrued interest receivable 790 - 790  Deferred tax asset 1,650 15 1,665  Core deposit intangible 55 2,646 2,701  Other assets 1,644 - 1,644  Total assets acquired $ 288,919 $ 326 $ 289,245   Liabilities, Assumed  Deposits  Demand and non-interest bearing $ 101,464 $ - $ 101,464  Savings and interest-bearing transaction accounts 59,356 - 59,356  Time deposits 84,410 - 84,410  Total Deposits 245,230 - 245,230  Other borrowings 7,180 - 7,180  Accrued interest payable and other liabilities 1,833 320 2,153  Subordinated debentures 5,155 - 5,155  Total liabilities assumed 259,398 320 259,718   Equity  Equity 31,158 (31,158) -  Total equity assumed 31,158 (31,158) -   Total liabilities and equity assumed $ 290,556 $ (30,838) $ 259,718   Net assets acquired 29,527  Purchase price 41,781  Goodwill $ 12,254 
Pro Forma Condensed Financial Information	    For the year ended December 31,  2015(1) 2014  (Dollars in thousands except per share data)  Interest income $ 84,399 $ 84,710  Interest expense 8,049 8,236  Net interest income 76,350 76,474   Provision for loan losses (3,080) (6,398)   Non-interest income 16,292 21,439  Non-interest expense (2) 68,860 67,779  Income before taxes 26,862 36,532  Income taxes 9,601 13,646  Net income 17,261 22,886   Earnings allocated to participating securities (258) (253)  Numerator for earnings per common share $ 17,003 $ 22,633   Earnings per share:  Basic $ 0.90 $ 1.10  Diluted 0.89 1.09   Basic weighted average shares outstanding 18,975,450 20,631,471  Diluted weighted average shares outstanding 19,129,533 20,774,348  ( 1 ) Subsequent to the Bancshares M erger date, activity related to Bancshares contributed pre-tax revenues of $2.9 million and incurred pre-tax expenses of $1.2 million, resulting in $1.1 million total contribution to our net income. We incurred pre-tax non-recurring expenses totaling $1.9 million, including: $0.5 million in personnel related expenses, $0.4 million in data processing expenses, $0.5 million in legal, accounting and investment banker expenses, and $0.5 million in marketing and other expenses.  (2) The 2015 pro forma non-interest expense is adjusted to exclude $2.5 million of pre-tax non-recurring expenses incurred by Bancshares prior to the Bancshares Merger date attributed to the following: $0.7 million in employee related expenses, $0.4 million in legal expenses, and $1.4 million to discount a loan pursuant to a provision of the Bancshares Merger Agreement.
Changes In The Carrying Amounts And Accretable Yields For ASC 310.30 Loans	   For the year ended December 31,  2016 2015  Carrying Carrying  Accretable amount Accretable amount  (Dollars in thousands) Yield of loans Yield of loans  Balance at beginning of period $ 807 $ 7,914 $ 540 $ 4,971  Acquisition - - (11) 4,396  Payments received - (2,964) 1 (1,814)  Transfers to other real estate / repossessed assets - - 541 -  Net charge-offs (11) (318) - (81)  Net reclassifications to / from nonaccretable amount - - 240 -  Accretion (166) - (504) 442  Balance at end of period $ 630 $ 4,632 $ 807 $ 7,914 

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investment Securities [Abstract]
Summary Of Amortized Cost And Fair Values Of Investment Securities	   Amortized Gross Unrealized Fair  (Dollars in thousands) Cost Gains Losses Value  At December 31, 2016  Held to Maturity:  Obligations of state and political subdivisions $ 10,443 $ 242 $ (8) $ 10,677  Total $ 10,443 $ 242 $ (8) $ 10,677   Available for Sale:  Federal agency securities $ 69,691 $ 201 $ (198) $ 69,694  Obligations of state and political subdivisions 46,105 461 (191) 46,375  Residential mortgage-backed securities 282,035 573 (1,966) 280,642  Asset-backed securities 9,265 - (88) 9,177  Corporate debt 20,017 385 (72) 20,330  Total $ 427,113 $ 1,620 $ (2,515) $ 426,218   At December 31, 2015  Held to Maturity:  Obligations of state and political subdivisions $ 11,797 $ 488 $ (3) $ 12,282  Total $ 11,797 $ 488 $ (3) $ 12,282   Available for Sale:  Federal agency securities $ 78,363 $ 220 $ (373) $ 78,210  Obligations of state and political subdivisions 47,079 620 (134) 47,565  Residential mortgage-backed securities 240,804 936 (1,852) 239,888  Asset-backed securities 9,639 - (224) 9,415  Corporate debt 25,251 148 (146) 25,253  Total $ 401,136 $ 1,924 $ (2,729) $ 400,331 
Amortized Cost And Approximate Fair Value Of Investment Securities By Maturity Date	   Available for Sale Held to Maturity  Amortized Fair Amortized Fair  (Dollars in thousands) Cost Value Cost Value  One year or less $ 7,702 $ 7,747 $ - $ -  More than one year through five years 309,028 308,505 9,298 9,535  More than five years through ten years 76,505 75,976 1,145 1,142  More than ten years 33,878 33,990 - -  Total $ 427,113 $ 426,218 $ 10,443 $ 10,677 
Summary Of Sales Of Available For Sale Securities	  (Dollars in thousands) 2016 2015 2014  Proceeds from sales $ 43,593 $ 162 $ 2,545  Gross realized gains 348 162 1,120  Gross realized losses (54) - - 
Summary Of Securities With Gross Unrealized Losses And Their Fair Values	   Continuous Unrealized  Amortized cost of Loss Existing for: Fair value of  Number of securities with Less Than More Than securities with  (Dollars in thousands) Securities unrealized losses 12 Months 12 Months unrealized losses  At December 31, 2016  Held to Maturity:  Obligations of state and political subdivisions 7 $ 1,987 $ (8) $ - $ 1,979  7 $ 1,987 $ (8) $ - $ 1,979   Available for Sale:  Federal agency securities 13 $ 34,734 $ (111) $ (87) $ 34,536  Obligations of state and political subdivisions 36 18,283 (145) (46) 18,092  Residential mortgage-backed securities 89 225,986 (1,618) (348) 224,020  Asset-backed securities 3 9,265 - (88) 9,177  Other Securities 2 5,005 - (72) 4,933  Total 143 $ 293,273 $ (1,874) $ (641) $ 290,758   At December 31, 2015  Held to Maturity:  Obligations of state and political subdivisions 1 $ 1,677 $ - $ (3) $ 1,674  1 $ 1,677 $ - $ (3) $ 1,674   Available for Sale:  Federal agency securities 14 $ 42,438 $ (138) $ (235) $ 42,065  Obligations of state and political subdivisions 14 11,765 (57) (77) 11,631  Residential mortgage-backed securities 87 175,043 (1,247) (605) 173,191  Asset-backed securities 3 9,639 (115) (109) 9,415  Other Securities 6 14,987 (75) (71) 14,841  Total 124 $ 253,872 $ (1,632) $ (1,097) $ 251,143 

Loans And Allowance For Loan 35

Loans And Allowance For Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
Loans And Allowance For Loan Losses [Abstract]
Southwest's Loan Classifications	   (Dollars in thousands) At December 31, 2016 At December 31, 2015  Real estate mortgage:  Commercial $ 882,071 $ 938,462  One-to-four family residential 199,123 161,958  Real estate construction:  Commercial 199,113 129,070  One-to-four family residential 20,946 21,337  Commercial 556,248 507,173  Installment and consumer 19,631 21,429  Total loans, including held for sale 1,877,132 1,779,429  Less allowance for loan losses (27,546) (26,106)  Total loans, net $ 1,849,586 $ 1,753,323 
Recorded Investment In Loans On Nonaccrual Status	   At December 31,  (Dollars in thousands) 2016 2015  Real estate mortgage:  Commercial $ 6,471 $ 3,543  One-to-four family residential 2,766 1,729  Real estate construction:  Commercial 522 562  One-to-four family residential 448 448  Commercial 5,949 13,491  Other consumer 111 85  Total nonaccrual loans $ 16,267 $ 19,858 
Age Analysis Of Past Due Loans	   90 days and Recorded loans  30-89 days greater Total past Total > 90 days and  (Dollars in thousands) past due past due due Current loans accruing  At December 31, 2016  Real estate mortgage:  Commercial $ 24 $ 6,472 $ 6,496 $ 875,575 $ 882,071 $ -  One-to-four family residential 631 2,903 3,534 195,589 199,123 138  Real estate construction:  Commercial - 522 522 198,591 199,113 -  One-to-four family residential - 448 448 20,498 20,946 -  Commercial 2,530 6,142 8,672 547,576 556,248 193  Other 359 123 482 19,149 19,631 12  Total $ 3,544 $ 16,610 $ 20,154 $ 1,856,978 $ 1,877,132 $ 343    At December 31, 2015  Real estate mortgage:  Commercial $ 272 $ 3,992 $ 4,264 $ 934,198 $ 938,462 $ 449  One-to-four family residential 549 1,777 2,326 159,632 161,958 48  Real estate construction:  Commercial - 493 493 128,577 129,070 -  One-to-four family residential - 517 517 20,820 21,337 -  Commercial 278 13,491 13,769 493,404 507,173 -  Other 65 88 153 21,276 21,429 3  Total $ 1,164 $ 20,358 $ 21,522 $ 1,757,907 $ 1,779,429 $ 500  
Impaired Loans	   With No Specific Allowance With A Specific Allowance  Unpaid Unpaid  Recorded Principal Recorded Principal Related  (Dollars in thousands) Investment Balance Investment Balance Allowance  At December 31, 2016  Commercial real estate $ 1,536 $ 3,057 $ 6,053 $ 6,529 $ 2,219  One-to-four family residential 1,188 1,535 1,593 1,698 63  Real estate construction 762 926 207 245 40  Commercial 1,032 2,861 4,963 7,480 1,346  Other 111 115 - - -  Total $ 4,629 $ 8,494 $ 12,816 $ 15,952 $ 3,668   At December 31, 2015  Commercial real estate $ 12,166 $ 15,747 $ 10,940 $ 10,940 $ 1,575  One-to-four family residential 1,688 2,195 185 186 11  Real estate construction 1,078 1,327 - - -  Commercial 4,095 5,430 9,844 15,968 2,526  Other 85 94 - - -  Total $ 19,112 $ 24,793 $ 20,969 $ 27,094 $ 4,112  
Average Recorded Investment And Interest Income Recognized On Impaired Loans	   As of and for the year ended December 31,  2016 2015 2014  Average Average Average  Recorded Interest Recorded Interest Recorded Interest  (Dollars in thousands) Investment Income Investment Income Investment Income  Commercial real estate $ 7,394 $ 750 $ 25,044 $ 970 $ 30,257 $ 968  One-to-four family residential 3,448 15 2,323 1 2,764 1  Real estate construction 1,050 14 997 - 222 -  Commercial 6,905 96 8,527 215 7,718 68  Other 52 3 51 - 16 -  Total $ 18,848 $ 878 $ 36,942 $ 1,186 $ 40,977 $ 1,037 
Troubled Debt Restructured Loans Outstanding	   At December 31, 2016 At December 31, 2015  (Dollars in thousands) Accruing Nonaccrual Accruing Nonaccrual  Commercial real estate $ 1,118 $ 475 $ 19,563 $ 448  One-to-four family residential 15 46 13 48  Commercial 45 3,323 659 5,796  Total $ 1,178 $ 3,844 $ 20,235 $ 6,292 
Loans Modified As Troubled Debt Restructurings	  For the year ended December 31,  2016 2015  Number of Recorded Number of Recorded  (Dollars in thousands) Modifications Investment Modifications Investment  Commercial real estate 1 $ 164 - $ -  Commercial 1 24 1 5,511  Total 2 $ 188 1 $ 5,511 
Classification Of Risk Category Of Loans, By Classes	   Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At December 31, 2016  Grade:  Pass $ 857,290 $ 192,395 $ 210,780 $ 498,039 $ 19,518 $ 1,778,022  Special Mention 4,479 1,983 7,720 24,639 - 38,821  Substandard 20,302 4,745 1,559 33,175 113 59,894  Doubtful - - - 395 - 395  Total $ 882,071 $ 199,123 $ 220,059 $ 556,248 $ 19,631 $ 1,877,132   At December 31, 2015  Grade:  Pass $ 902,034 $ 157,912 $ 148,811 $ 480,928 $ 21,284 $ 1,710,969  Special Mention 5,916 29 586 2,941 50 9,522  Substandard 30,512 4,017 1,010 18,848 95 54,482  Doubtful - - - 4,456 - 4,456  Total $ 938,462 $ 161,958 $ 150,407 $ 507,173 $ 21,429 $ 1,779,429 
By Balance In The Allowance For Loan Losses And The Recorded Investment In Loans Portfolio Classification Disaggregated On The Basis Of Impairment Evaluation Method	     Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At December 31, 2016  Balance at beginning of period $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106  Loans charged-off (193) (134) - (6,148) (522) (6,997)  Recoveries 400 77 - 3,079 112 3,668  Provision (credit) for loan losses (416) 520 969 3,162 534 4,769  Balance at end of period $ 12,507 $ 1,163 $ 3,502 $ 10,058 $ 316 $ 27,546   Allowance for loan losses ending balance:  Individually evaluated for impairment $ 2,219 $ 63 $ - $ 1,346 $ - $ 3,628  Collectively evaluated for impairment 10,288 1,100 3,462 8,712 316 23,878  Acquired with deteriorated credit quality - - 40 - - 40  Total ending allowance balance $ 12,507 $ 1,163 $ 3,502 $ 10,058 $ 316 $ 27,546   Loans receivable ending balance:  Individually evaluated for impairment $ 6,606 $ 1,766 $ 390 $ 5,357 $ - $ 14,119  Collectively evaluated for impairment 872,997 196,123 219,015 550,615 19,631 1,858,381  Acquired with deteriorated credit quality 2,468 1,234 654 276 - 4,632  Total ending loans balance $ 882,071 $ 199,123 $ 220,059 $ 556,248 $ 19,631 $ 1,877,132      Commercial 1-4 Family Real Estate  Real Estate Residential Construction Commercial Other Total  At December 31, 2015  Balance at beginning of period $ 13,678 $ 712 $ 4,159 $ 9,614 $ 289 $ 28,452  Loans charged-off (489) (20) (21) (628) (193) (1,351)  Recoveries 282 558 47 1,479 205 2,571  Provision (credit) for loan losses (755) (550) (1,652) (500) (109) (3,566)  Balance at end of period $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106   Allowance for loan losses ending balances:  Individually evaluated for impairment $ 1,575 $ 11 $ - $ 2,526 $ - $ 4,112  Collectively evaluated for impairment 11,141 689 2,533 7,439 192 21,994  Acquired with deteriorated credit quality - - - - - -  Total ending allowance balance $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106   Loans receivable ending balance:  Individually evaluated for impairment $ 20,332 $ 695 $ 391 $ 13,396 $ 47 $ 34,861  Collectively evaluated for impairment 913,242 159,672 149,344 493,026 21,370 1,736,654  Acquired with deteriorated credit quality 4,888 1,591 672 751 12 7,914  Total ending loans balance $ 938,462 $ 161,958 $ 150,407 $ 507,173 $ 21,429 $ 1,779,429     Commercial 1-4 Family Real Estate  Real Estate Residential Construction Commercial Other Total  At December 31, 2014  Balance at beginning of period $ 18,854 $ 850 $ 5,523 $ 10,985 $ 451 $ 36,663  Loans charged-off (1,400) (289) (655) (4,014) (558) (6,916)  Recoveries 3,733 213 - 1,119 264 5,329  Provision (credit) for loan losses (7,509) (62) (709) 1,524 132 (6,624)  Balance at end of period $ 13,678 $ 712 $ 4,159 $ 9,614 $ 289 $ 28,452   Allowance for loan losses ending balances:  Individually evaluated for impairment $ 2,047 $ - $ - $ 1,822 $ - $ 3,869  Collectively evaluated for impairment 11,631 712 4,159 7,792 289 24,583  Acquired with deteriorated credit quality - - - - - -  Total ending allowance balance $ 13,678 $ 712 $ 4,159 $ 9,614 $ 289 $ 28,452   Loans receivable ending balance:  Individually evaluated for impairment $ 23,907 $ 538 $ 104 $ 13,560 $ 2 $ 38,111  Collectively evaluated for impairment 725,635 75,598 196,905 336,818 21,953 1,356,909  Acquired with deteriorated credit quality 3,429 1,395 114 32 1 4,971  Total ending loans balance $ 752,971 $ 77,531 $ 197,123 $ 350,410 $ 21,956 $ 1,399,991 

Premises And Equipment (Tables)

Premises And Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Premises And Equipment [Abstract]
Premises And Equipment	   At December 31,  (Dollars in thousands) 2016 2015  Land $ 6,630 $ 6,630  Buildings and improvements 25,861 25,219  Furniture, fixtures, and equipment 32,409 30,813  Construction/remodeling in progress 38 965  64,938 63,627  Accumulated depreciation and amortization (42,130) (39,808)  Total premises and equipment, net $ 22,808 $ 23,819  
Future Minimum Annual Rental Payments	  (Dollars in thousands)  2017 $ 2,723  2018 2,277  2019 2,091  2020 2,016  2021 1,333  Thereafter 2,822  Total $ 13,262 

Goodwill And Other Intangible37

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill And Other Intangible Assets [Abstract]
Gross Carrying Amount Of Other Intangible Assets And Accumulated Amortization	  At December 31,  (Dollars in thousands) 2016 2015  Core deposit premiums $ 6,119 $ 6,119  Less accumulated amortization (3,820) (3,225)  Core deposit premiums, net 2,299 2,894   Loan servicing rights 14,710 13,635  Less accumulated amortization (11,219) (9,914)  Loan servicing rights, net 3,491 3,721   Other intangible assets, net $ 5,790 $ 6,615 
Future Amortization Expense For Other Intangibles Assets	  (Dollars in thousands) Core Deposit Premiums Loan Servicing Rights Total  2017 $ 451 $ 654 $ 1,105  2018 391 571 962  2019 386 478 864  2020 386 396 782  2021 386 323 709  Thereafter 299 1,069 1,368  $ 2,299 $ 3,491 $ 5,790 

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Measurements [Abstract]
Summary Of Financial Assets Measured At Fair Value On A Recurring Basis	   Fair Value Measurement at Reporting Date Using  Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  (Dollars in thousands) Total (Level 1) (Level 2) (Level 3)  At December 31, 2016  Available for sale securities:  Federal agency securities 69,694 - 69,694 -  Obligations of state and political subdivisions 46,375 - 46,375 -  Residential mortgage-backed securities 280,642 - 280,642 -  Asset-backed securities 9,177 - 9,177 -  Corporate debt 20,330 213 20,117 -   Derivative asset 1,235 1,235  Derivative liability (1,890) - (1,890) -  Total $ 425,563 $ 213 $ 425,350 $ -   At December 31, 2015  Available for sale securities:  Federal agency securities 78,211 - 78,211 -  Obligations of state and political subdivisions 47,564 - 47,564 -  Residential mortgage-backed securities 239,888 - 239,888 -  Asset-backed securities 9,415 - 9,415 -  Corporate debt 25,253 137 25,116 -   Derivative asset 1,793 1,793 -  Derivative liability (3,163) - (3,163) -  Total $ 398,961 $ 137 $ 398,824 $ - 
Asset Measured At Fair Value On A Nonrecurring Basis	   Fair Value Measurements Using  Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  (Dollars in thousands) Total (Level 1) (Level 2) (Level 3)  At December 31, 2016  Impaired loans at fair value :  Commercial real estate $ 6,053 $ - $ $ 6,053  One-to-four family residential 1,593 - - 1,593  Real estate construction 207 - - 207  Commercial 5,357 - 5,357   Loans held for sale:  One-to-four family residential 4,386 - 4,386 -   Total $ 17,596 $ - $ 4,386 $ 13,210   At December 31, 2015  Impaired loans at fair value :  Commercial real estate $ 11,182 $ - $ $ 11,182  One-to-four family residential 185 - - 185  Real estate construction 390 - - 390  Commercial 9,845 - 9,845   Loans held for sale:  One-to-four family residential 7,453 - 7,453 -   Other real estate 2,274 - - 2,274  Mortgage loan servicing rights 3,721 - 3,721 -  Total $ 35,050 $ - $ 11,174 $ 23,876 
Carrying Values And Estimated Fair Values Of Financial Instruments Segregated By The Level Of The Valuation Inputs	   At December 31, 2016 At December 31, 2015  Carrying Fair Carrying Fair  (Dollars in thousands) Values Values Values Values  Financial assets:  Level 2 inputs:  Cash and cash equivalents $ 75,650 $ 75,650 $ 78,129 $ 78,129  Securities held to maturity 10,443 10,677 11,797 12,282  Accrued interest receivable 6,194 6,194 5,767 5,767  Mortgage loan servicing rights 3,491 4,159 3,721 3,721  Bank-owned life insurance 28,575 28,575 27,676 27,676  Investments included in other assets 14,627 14,627 10,383 10,383  Level 3 inputs:  Total loans, net of allowance 1,849,586 1,839,960 1,753,323 1,728,114  Financial liabilities:  Level 2 inputs:  Deposits 1,946,018 1,897,927 1,884,105 1,780,954  Accrued interest payable 1,132 1,132 867 867  Other liabilities 9,516 9,516 10,314 10,314  Other borrowings 183,814 183,926 110,927 112,149  Subordinated debentures 46,393 46,393 51,548 51,548 

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Schedule Of Deposits	  (Dollars in thousands) 2016 2015  Noninterest-bearing demand $ 551,709 $ 596,494  Interest-bearing demand 152,656 151,015  Money market accounts 567,058 534,357  Savings accounts 56,410 56,333  Time deposits of $100,000 or more 360,307 311,538  Other time deposits 257,878 234,368  Total deposits $ 1,946,018 $ 1,884,105 
Scheduled Time Deposits	  (Dollars in thousands)  2017 $465,324  2018 115,862  2019 22,025  2020 8,372  2021 6,575  Thereafter 27  Total time deposits $618,185 

Borrowed Funds (Tables)

Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2016
Borrowed Funds [Abstract]
Schedule Of Borrowed Funds	  2016 2015  (Dollars in thousands) Balance at December 31 Average Balance Weighted Average Rate Balance at December 31 Average Balance Weighted Average Rate  Securities sold under repurchase  agreements $ 45,814 $ 45,812 0.05 % $ 37,273 $ 44,218 0.07 %  Federal Home Loan Bank advances 138,000 97,569 1.31 73,654 28,289 3.11  $ 183,814 $ 110,927 

Trust Preferred Securities an41

Trust Preferred Securities and Subordinated Debentures (Tables)	12 Months Ended
	Dec. 31, 2016
Subordinated Debentures [Abstract]
Schedule of Trust Preferred Securities	    At December 31, 2016  (Dollars in thousands) Subordinated Debentures Owed to Trusts Trust Preferred Securities of the Trusts Rates Final Maturity Date  OKSB Statutory Trust I $ 20,619 $ 20,000 4.10% June 26, 2033  SBI Capital Trust II 25,774 25,000 3.73% October 7, 2033  $ 46,393 $ 45,000     At December 31, 2015  (Dollars in thousands) Subordinated Debentures Owed to Trusts Trust Preferred Securities of the Trusts Rates Final Maturity Date  OKSB Statutory Trust I $ 20,619 $ 20,000 3.70% June 26, 2033  SBI Capital Trust II 25,774 25,000 3.17% October 7, 2033  FCBI Statutory Trust I 5,155 5,000 3.33% September 4, 2033  $ 51,548 $ 50,000 

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments [Abstract]
Non-Hedge Derivative Assets and Liabilities	  As of December 31,2016 As of December 31,2015  (Dollars in thousands) Notional Fair Value Notional Fair Value  Non-hedge derivative assets $ 123,953 $ 1,235 $ 101,629 $ 1,793  Non-hedge derivative liabilities 123,953 1,235 101,629 1,793 

Taxes On Income (Tables)

Taxes On Income (Tables)	12 Months Ended
	Dec. 31, 2016
Taxes On Income [Abstract]
Components of taxes on income	  For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Current tax (benefit) expense:  Federal $ 8,809 $ 7,534 $ 3,251  State 173 143 186  Deferred tax expense (benefit):  Federal 44 1,126 7,970  State 783 990 1,210  Taxes on income $ 9,809 $ 9,793 $ 12,617 
Reconciliation from the expected tax exense (benefit) to consolidated effective income tax expense (benefit)	  For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Computed tax (benefit) expense at statutory rates $ 9,630 $ 9,520 $ 11,777  Increase (decrease) in income taxes resulting from:  Benefit of income not subject to U.S. Federal income tax (632) (621) (209)  Expenses not deductible for U.S. Federal income tax 216 220 129  State income taxes, net of Federal income tax benefit 621 736 907  Other (26) (62) 13  Taxes on income $ 9,809 $ 9,793 $ 12,617 
Temporary differences that give rise to the deferred tax assets	  At December 31,  (Dollars in thousands) 2016 2015  Deferred tax assets:  Provision for loan losses $ 10,976 $ 10,291  Net operating loss carryforward 380 858  Write-downs on other real estate - 57  Nonaccrual loan interest 510 603  Deferred compensation & profit sharing accrual 782 711  Investments 306 311  Section 597 gain - FDIC-assisted acquisition 388 472  Accrued expenses 859 1,013  Loan purchase accounting adjustment 1,392 2,725  Stock-based compensation 805 629  Other 659 (2)  Total deferred tax assets 17,057 17,668   Deferred tax liabilities:  Accumulated depreciation (2,966) (2,877)  Amortizable assets (933) (1,089)  Dividend - Equity vs. Cost Method (471) (393)  Prepaid expenses (110) (109)  FHLB stock dividends (65) (132)  Total deferred tax liabilities (4,545) (4,600)  Deferred taxes payable on investment  securities available for sale 643 885  Net deferred tax asset $ 13,155 $ 13,953 

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Computation Of Basic And Diluted Earnings Per Common Share	   (Dollars in thousands, except earnings per share data) 2016 2015 2014  Numerator:  Net income $ 17,704 $ 17,407 $ 21,030  Earnings allocated to participating securities (279) (258) (253)  Numerator for earnings per common share $ 17,425 $ 17,149 $ 20,777   Denominator:  Denominator for basic earnings per common share 18,660,951 18,975,450 19,417,486  Dilutive effect of stock compensation 205,916 148,059 142,877  Denominator for diluted earnings per common share 18,866,867 19,123,509 19,560,363   Earnings per common share:  Basic $ 0.93 $ 0.90 $ 1.07  Diluted $ 0.92 $ 0.90 $ 1.06 

Capital Requirements And Regu45

Capital Requirements And Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2016
Capital Requirements And Regulatory Matters [Abstract]
Southwest’s and Bank SNB’s Actual Capital Amounts And Ratios	  A summary of actual capital amounts and ratios as of December 31, 2016 are presented below.     Required to be Considered For Capital  Actual Well-Capitalized Adequacy Purposes  (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio  As of December 31, 2016:  Total CET1 Capital (to risk-weighted assets)  Southwest $ 272,882 12.36 % $ 143,488 6.50 % $ 99,338 4.50 %  Bank SNB 301,023 13.66 143,189 6.50 99,131 4.50  Total Capital (to risk-weighted assets)  Southwest 345,597 15.66 220,751 10.00 176,601 8.00  Bank SNB 328,681 14.92 220,291 10.00 176,232 8.00  Tier 1 Capital (to risk-weighted assets)  Southwest 317,882 14.40 176,601 8.00 132,450 6.00  Bank SNB 301,023 13.66 176,232 8.00 132,174 6.00  Tier 1 Leverage (to average assets)  Southwest 317,882 13.02 122,046 5.00 97,637 4.00  Bank SNB 301,023 12.37 121,686 5.00 97,349 4.00  A summary of actual capital amounts and ratios as of December 31, 2015 are presented below.     Required to be Considered For Capital  Actual Well-Capitalized Adequacy Purposes  (Dollars in thousands) Amount Ratio Amount Ratio Amount Ratio  As of December 31, 2015:  Total CET1 Capital (to risk-weighted assets)  Southwest $ 282,737 13.21 % $ 139,122 6.50 % $ 96,316 4.50 %  Bank SNB 291,125 13.65 138,637 6.50 95,980 4.50  Total Capital (to risk-weighted assets)  Southwest 359,300 16.79 214,034 10.00 171,228 8.00  Bank SNB 317,865 14.90 213,288 10.00 170,631 8.00  Tier 1 Capital (to risk-weighted assets)  Southwest 332,468 15.53 171,228 8.00 128,421 6.00  Bank SNB 291,125 13.65 170,631 8.00 127,973 6.00  Tier 1 Leverage (to average assets)  Southwest 332,468 14.41 115,371 5.00 92,297 4.00  Bank SNB 291,125 12.66 114,939 5.00 91,951 4.00 

Off-Balance-Sheet Arrangments,

Off-Balance-Sheet Arrangments, Commitments, Guarantees And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies [Abstract]
Summary Of Off-Balance-Sheet Financial Instruments	  At December 31,  (Dollars in thousands) 2016 2015  Commitments to extend commercial and real estate mortgage credit $ 429,383 $ 446,412  Standby and commercial letters of credit 7,160 6,595  Total $ 436,543 $ 453,007 

Operating Segments (Tables)

Operating Segments (Tables)	12 Months Ended
	Dec. 31, 2016
Operating Segments [Abstract]
Financial Results By Operating Segment	    For the year ended December 31, 2016  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company   Net interest income $ 50,590 $ 22,697 $ 6,694 $ (538) $ 79,443  Provision for loan losses 2,007 973 1,786 3 4,769  Noninterest income 11,576 1,273 1,202 2,034 16,085  Noninterest expenses 40,083 13,734 5,275 4,154 63,246  Income (loss) before taxes 20,076 9,263 835 (2,661) 27,513  Taxes on income 7,157 3,303 298 (949) 9,809  Net income (loss) $ 12,919 $ 5,960 $ 537 $ (1,712) $ 17,704   * Includes externally generated revenue of $3.0 million, primarily from investing services, and an internally generated loss of $1.5 million from the funds management unit.   Total loans at period end $ 1,095,930 $ 636,643 $ 144,559 $ - $ 1,877,132  Total assets at period end 1,138,969 633,328 143,558 559,537 2,475,392  Total goodwill at period end 12,525 1,020 - - 13,545  Total deposits at period end 1,330,176 195,603 147,823 272,416 1,946,018     For the year ended December 31, 2015  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company   Net interest income $ 42,019 $ 21,168 $ 6,277 $ (2,047) $ 67,417  Provision (credit) for loan losses (2,068) (632) (868) 2 (3,566)  Noninterest income 10,134 1,485 1,473 1,365 14,457  Noninterest expenses 33,136 14,324 6,152 4,628 58,240  Income (loss) before taxes 21,085 8,961 2,466 (5,312) 27,200  Taxes on income 7,591 3,227 888 (1,913) 9,793  Net income (loss) $ 13,494 $ 5,734 $ 1,578 $ (3,399) $ 17,407   * Includes externally generated revenue of $2.1 million, primarily from investing services, and an internally generated loss of $2.8 million from the funds management unit.   Total loans at period end $ 1,048,473 $ 580,476 $ 150,480 $ - $ 1,779,429  Total assets at period end 1,098,735 578,749 149,847 529,691 2,357,022  Total goodwill at period end 12,447 1,020 - - 13,467  Total deposits at period end 1,374,227 209,146 119,313 181,419 1,884,105     For the year ended December 31, 2014  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company   Net interest income $ 38,846 $ 19,187 $ 9,469 $ (2,498) $ 65,004  Provision (credit) for loan losses (2,561) (3,640) (425) 2 (6,624)  Noninterest income 9,030 1,594 1,576 6,731 18,931  Noninterest expenses 31,363 13,387 8,616 3,546 56,912  Income before taxes 19,074 11,034 2,854 685 33,647  Taxes on income 7,152 4,138 1,070 257 12,617  Net income $ 11,922 $ 6,896 $ 1,784 $ 428 $ 21,030   * Includes externally generated revenue of $7.6 million, primarily from investing services, and an internally generated loss of $3.3 million from the funds management unit.   Total loans at period end $ 793,262 $ 460,680 $ 146,043 $ 6 $ 1,399,991  Total assets at period end 805,704 458,489 147,256 530,585 1,942,034  Total goodwill at period end 194 1,020 - - 1,214  Total deposits at period end 1,113,477 224,634 110,901 84,987 1,533,999 

Parent Company Condensed Fina48

Parent Company Condensed Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
Parent Company Condensed Financial Information [Abstract]
Parent Company Statements of Financial Condition	  At December 31,  (Dollars in thousands) 2016 2015  Statements of Financial Condition  Assets:  Cash and cash equivalents $ 12,105 $ 30,469  Investment in subsidiary banks 315,181 305,064  Investments in other subsidiaries 2,084 8,444  Other assets 5,499 6,393  Total $ 334,869 $ 350,370   Liabilities:  Subordinated debentures 46,393 51,548  Other liabilities 1,847 2,724  Shareholders' Equity:  Common stock and related accounts 286,629 296,098  Total $ 334,869 $ 350,370  
Parent Company Statements of Operations	  For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Statements of Operations  Income:  Cash dividends from subsidiaries $ 10,052 $ 20,046 $ 18,045  Noninterest income 25 45 34  Investment income - 20 1,337  Other operating income 15 25 3  Security gains - 163 -  Total income 10,092 20,299 19,419  Expense:  Interest on subordinated debentures 1,740 1,566 1,505  Noninterest expense 2,191 1,756 1,317  Total expense 3,931 3,322 2,822  Total income before taxes and equity in  undistributed income of subsidiaries 6,161 16,977 16,597  Taxes on income (1,377) (1,167) (582)  Income before equity in undistributed  income of subsidiaries 7,538 18,144 17,179  Equity in undistributed income (loss) of subsidiaries 10,166 (737) 3,851  Net income $ 17,704 $ 17,407 $ 21,030 
Parent Company Statements of Cash Flows	  For the Year Ended December 31,  (Dollars in thousands) 2016 2015 2014  Statements of Cash Flows  Operating activities:  Net income $ 17,704 $ 17,407 $ 21,030  Equity in undistributed (income) loss of subsidiaries (10,166) 737 (3,851)  Other, net 6,823 2,295 2,937  Net cash provided by operating activities 14,361 20,439 20,116  Investing activities:  Available for sale securities:  Purchases - - (1,121)  Sales / Maturities - 750 2,540  Outlays for business acquisitions - (4,697) -  Other, net - (155) -  Net cash provided by (used in) investing activities - (4,102) 1,419  Financing activities:  Net proceeds from issuance of common stock 1,239 682 1,386  Purchases of treasury stock (22,721) (8,624) (10,302)  Common stock dividend (6,088) (4,607) (3,132)  Other, net (5,155) 5,155 -  Net cash used in financing activities (32,725) (7,394) (12,048)  Net increase (decrease) in cash and cash equivalents (18,364) 8,943 9,487  Cash and cash equivalents,  Beginning of year 30,469 21,526 12,039  End of year $ 12,105 $ 30,469 $ 21,526 

Summary Of Significant Accoun49

Summary Of Significant Accounting And Reporting Policies (Details) $ in Thousands	Oct. 09, 2015USD ($)	Dec. 31, 2016USD ($)entityitemshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares
Number Of Total Branches | item		1
Interest-bearing balances held at depository institutions		$ 38,800	$ 53,200
Interest paid		9,700	7,000	$ 6,900
Income taxes paid		9,400	7,100	4,000
Stock issued for Bancshares acquisition	$ 21,400		21,366
Other real estate		350	2,274
Transfer to Other Real Estate		500	300	2,200
Restricted cash and cash equivalents		$ 1,000	7,000
Threshold Period Past Due for Write-off of Financing Receivable		90 days
Net unamortized deferred loan fees		$ 2,500	1,500
Assets, Total		2,475,392	2,357,022	1,214
Deposits, Total		$ 1,946,018	1,884,105	$ 1,533,999
Number Of Days For Independent Appraisals On Real Estate Collateral		30 days
Reserve For Unfunded Loan Commitments		$ 2,500	$ 2,400
Antidilutive options to purchase common shares | shares		6,573	38,145	0
Fair value of loan servicing rights		$ 4,200	$ 3,700
Simmons First National Corporation [Member]
Number Of Total Branches | entity		150
Assets, Total		$ 8,400
Deposits, Total		6,700
Loans and Leases Receivable, Net Reported Amount		$ 5,600
Minimum [Member]
Percentage change in fair value to be considered highly effective		80.00%
Stock option expiration period after grant		5 years
Minimum [Member] | Building and Building Improvements [Member]
Premises and equipmet, useful life		10 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Premises and equipmet, useful life		3 years
Maximum [Member]
Percentage change in fair value to be considered highly effective		125.00%
Stock option expiration period after grant		10 years
Maximum [Member] | Building and Building Improvements [Member]
Premises and equipmet, useful life		40 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Premises and equipmet, useful life		10 years
2008 Stock Based Award Plan [Member]
Stock Plan Term		10 years
Common stock reserved for issuance | shares		800,000

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) $ in Thousands	Dec. 14, 2016USD ($)shares	Oct. 09, 2015USD ($)itemshares	Dec. 31, 2016USD ($)entityitem	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Business Acquisition [Line Items]
Number of total branches | item			1
Business Combination, Consideration Transferred	$ 564,400
Assets, Total			$ 2,475,392	$ 2,357,022	$ 1,214
Deposits, Total			1,946,018	1,884,105	1,533,999
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	7,250,000
Payments to Acquire Businesses, Gross	$ 95,000
Business Combination, Fair Value Of Assets Acquired		$ 301,500
Goodwill		12,300	$ 13,545	$ 13,467	$ 1,942,034
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits		245,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 2,700
Effective tax rate			35.70%	36.00%	37.50%
Oklahoma City [Member]
Business Acquisition [Line Items]
Number of branches acquired | entity			5
Number of total branches		10	10
Denver [Member]
Business Acquisition [Line Items]
Number of branches acquired | entity			3
Number of total branches | entity			1
Parent Company [Member]
Business Acquisition [Line Items]
Assets, Total			$ 334,869	$ 350,370
Bancshares [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 41,781
Business Acquisition, Percentage of Voting Interests Acquired		51.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		1,213,985
Business Acquisition, Percentage of Cash		49.00%
Payments to Acquire Businesses, Gross		$ 20,400
Business Combination, Fair Value Of Assets Acquired		301,499
Loans from merger		202,433
Goodwill		12,254
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits		245,230
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 2,701
Loans purchased evaluated in conjunction with the acquisition				200,000
Loans purchased evaluated in conjunction with the acquisition, discount				4,500
Loans, purchase credit impaired				7,800
Loans and debt securities acquired with deteriorated credit quality, discount				$ 3,300
Effective tax rate				36.00%
Bancshares [Member] | Oklahoma City [Member]
Business Acquisition [Line Items]
Number of branches acquired | item		5
Bancshares [Member] | Denver [Member]
Business Acquisition [Line Items]
Number of branches acquired | item		3

Acquisitions (Reconciliation Of

Acquisitions (Reconciliation Of Cash Received From The Acquisition) (Details) $ in Thousands	Oct. 09, 2015USD ($)
Business Acquisition [Line Items]
Fair value of assets acquired	$ 301,500
Bancshares [Member]
Business Acquisition [Line Items]
Fair value of assets acquired	301,499
Liabilities assumed	(259,718)
Net assets acquired	41,781
Stock issued as consideration	(21,366)
Cash acquired	(32,699)
Cash received in business combination, net of cash paid	$ (12,284)

Acquisitions (Schedule Of Asset

Acquisitions (Schedule Of Assets Acquired And Liabilities Assumed ) (Details) - USD ($) $ in Thousands	Dec. 14, 2016	Oct. 09, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Loans		$ 202,400
Core deposit intangible		2,700
Total Deposits		245,200
Purchase price	$ 564,400
Goodwill		12,300	$ 13,545	$ 13,467	$ 1,942,034
Bancshares [Member]
Business Acquisition [Line Items]
Cash and due from banks		5,874
Interest-bearing deposits with other banks		17,196
Federal funds sold		9,629
Cash and cash equivalents		32,699
Investment securities		34,578
Loans		202,433
Total loans receivable		202,433
Bank premises and equipment, net		5,582
Cash value of life insurance		7,153
Accrued interest receivable		790
Deferred tax asset		1,665
Core deposit intangible		2,701
Other assets		1,644
Total assets acquired		289,245
Demand and non-interest bearing		101,464
Savings and interest-bearing transaction accounts		59,356
Time deposits		84,410
Total Deposits		245,230
Other borrowings		7,180
Accrued interest payable and other liabilities		2,153
Subordinated debentures		5,155
Total liabilities assumed		259,718
Total liabilities and equity assumed		259,718
Net assets acquired		29,527
Purchase price		41,781
Goodwill		12,254
Bancshares [Member] | Acquired From Bancshares [Member]
Business Acquisition [Line Items]
Cash and due from banks		5,874
Interest-bearing deposits with other banks		17,196
Federal funds sold		9,629
Cash and cash equivalents		32,699
Investment securities		34,762
Loans		210,223
Allowance for loan losses		4,298
Total loans receivable		205,925
Bank premises and equipment, net		4,241
Cash value of life insurance		7,153
Accrued interest receivable		790
Deferred tax asset		1,650
Core deposit intangible		55
Other assets		1,644
Total assets acquired		288,919
Demand and non-interest bearing		101,464
Savings and interest-bearing transaction accounts		59,356
Time deposits		84,410
Total Deposits		245,230
Other borrowings		7,180
Accrued interest payable and other liabilities		1,833
Subordinated debentures		5,155
Total liabilities assumed		259,398
Equity		31,158
Total equity assumed		31,158
Total liabilities and equity assumed		290,556
Bancshares [Member] | Fair Value Adjustments [Member]
Business Acquisition [Line Items]
Investment securities		(184)
Loans		(7,790)
Allowance for loan losses		(4,298)
Total loans receivable		(3,492)
Bank premises and equipment, net		1,341
Deferred tax asset		15
Core deposit intangible		2,646
Total assets acquired		326
Accrued interest payable and other liabilities		320
Total liabilities assumed		320
Equity		(31,158)
Total equity assumed		(31,158)
Total liabilities and equity assumed		$ (30,838)

Acquisitions (Pro Forma Condens

Acquisitions (Pro Forma Condensed Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Business Acquisition [Line Items]
Net income			$ 17,704	$ 17,407		$ 21,030
Parent Company [Member]
Business Acquisition [Line Items]
Net income			$ 17,704	17,407		21,030
Bancshares [Member]
Business Acquisition [Line Items]
Interest Income				84,399	[1]	84,710
Interest expense				8,049	[1]	8,236
Net interest income				76,350	[1]	76,474
Provision for loan losses				(3,080)	[1]	(6,398)
Non-interest income				16,292	[1]	21,439
Non-interest expense	[2]			68,860	[1]	67,779
Income before taxes				26,862	[1]	36,532
Income taxes				9,601	[1]	13,646
Net income				17,261	[1]	22,886
Earnings allocated to participating securities				(258)	[1]	(253)
Numerator for earnings per common share				$ 17,003	[1]	$ 22,633
Earnings per share: Basic				$ 0.90	[1]	$ 1.10
Earnings per share: Diluted				$ 0.89	[1]	$ 1.09
Basic weighted average shares outstanding				18,975,450	[1]	20,631,471
Diluted weighted average shares outstanding				19,129,533	[1]	20,774,348
Revenues		$ 2,900
Costs and Expenses		1,200
Net income		1,100
Other Nonrecurring Expense		1,900
Nonrecurring Personnel Related Expense		500
Nonrecurring Data Processing Expenses		400
Nonrecurring Legal, Accounting And Investment Banker Expenses		500
Nonrecurring Marketing And Other Expenses		$ 500
Pro Forma Non-Recurring Expense				$ 2,500
Pro Forma Non-Recurring Expense, Employee Related Expense				700
Pro Forma Non-Recurring Expense, Legal Expenses				400
Pro Forma Non-Recurring Expense, Discount Loan Provision				$ 1,400
[1]	Subsequent to the Bancshares Merger date, activity related to Bancshares contributed pre-tax revenues of $2.9 million and incurred pre-tax expenses of $1.2 million, resulting in $1.1 million total contribution to our net income. We incurred pre-tax non-recurring expenses totaling $1.9 million, including: $0.5 million in personnel related expenses, $0.4 million in data processing expenses, $0.5 million in legal, accounting and investment banker expenses, and $0.5 million in marketing and other expenses.
[2]	The 2015 pro forma non-interest expense is adjusted to exclude $2.5 million of pre-tax non-recurring expenses incurred by Bancshares prior to the Bancshares Merger date attributed to the following: $0.7 million in employee related expenses, $0.4 million in legal expenses, and $1.4 million to discount a loan pursuant to a provision of the Bancshares Merger Agreement.

Acquisitions (Changes In Carryn

Acquisitions (Changes In Carryng Amounts And Accretable Yields) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquisitions [Abstract]
Balance at beginning of period, Accretable Yield	$ 807	$ 540
Acquisition, Accretable Yield		(11)
Payments received, Accretable Yield		1
Transfers to other real estate/ repossessed assets, Accretable Yield		541
Net charge-offs, Accretable Yield	(11)
Net reclassifications to / from nonaccretable amount, Accretable Yield		240
Accretion, Accretable yield	(166)	(504)
Balance at end of period, Accretable Yield	630	807
Balance at beginning of period, Carrying amount of loans	7,914	4,971
Acquisition, Carrying amount of loans		4,396
Payments Received, Carrying amount of loans	(2,964)	(1,814)
Net charged-offs, Carrying amount of loans	(318)	(81)
Accretion, Carrying amount of loans		442
Balance at end of period, Carrying amount of loans	$ 4,632	$ 7,914

Disposals (Narrative) (Details)

Disposals (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2016
Disposals [Abstract]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 4.4
Loans in disposal	27.9
Deposits in disposal	$ 130.6
Restructuring and Related Cost, Incurred Cost		$ 0.4

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investment Securities [Abstract]
Total investments carried at cost	$ 14.6	$ 10.4
Available for sale debt securities amortized cost pledged as collateral	$ 199	$ 174

Investment Securities (Summary

Investment Securities (Summary Of Amortized Cost And Fair Values Of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Held to Maturity	$ 10,443	$ 11,797
Gross Unrealized Gains, Held-to-maturity	242	488
Gross Unrealized Losses, Held to Maturity	(8)	(3)
Fair Value, Held to Maturity	10,677	12,282
Amortized Cost, Available for Sale	427,113	401,136
Gross Unrealized Gains, Available for Sale	1,620	1,924
Gross Unrealized Losses, Available for Sale	(2,515)	(2,729)
Available-for-sale Securities	426,218	400,331
Federal Agency Securities [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	69,691	78,363
Gross Unrealized Gains, Available for Sale	201	220
Gross Unrealized Losses, Available for Sale	(198)	(373)
Available-for-sale Securities	69,694	78,210
Obligations Of State And Political Subdivisions [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Held to Maturity	10,443	11,797
Gross Unrealized Gains, Held-to-maturity	242	488
Gross Unrealized Losses, Held to Maturity	(8)	(3)
Fair Value, Held to Maturity	10,677	12,282
Amortized Cost, Available for Sale	46,105	47,079
Gross Unrealized Gains, Available for Sale	461	620
Gross Unrealized Losses, Available for Sale	(191)	(134)
Available-for-sale Securities	46,375	47,565
Residential Mortgage-Backed Securities [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	282,035	240,804
Gross Unrealized Gains, Available for Sale	573	936
Gross Unrealized Losses, Available for Sale	(1,966)	(1,852)
Available-for-sale Securities	280,642	239,888
Asset-Backed Securities [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	9,265	9,639
Gross Unrealized Losses, Available for Sale	(88)	(224)
Available-for-sale Securities	9,177	9,415
Corporate Debt [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	20,017	25,251
Gross Unrealized Gains, Available for Sale	385	148
Gross Unrealized Losses, Available for Sale	(72)	(146)
Available-for-sale Securities	$ 20,330	$ 25,253

Investment Securities (Amortize

Investment Securities (Amortized Cost And Approximate Fair Value Of Investment Securities By Maturity Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized cost and approximate fair value [Abstract]
One year or less, Amortized cost, Available for Sale	$ 7,702
One year or less, Fair Value, Available for Sale	7,747
More than one year through five years, Amortized Cost, Available for Sale	309,028
More than one year through five years, Fair Value, Available for Sale	308,505
More than one year through five years, Amortized Cost, Held to Maturity	9,298
More than one year through five years, Fair Value, Held to Maturity	9,535
More than five years through ten years, Amortized Cost, Available for Sale	76,505
More than five years through ten years, Fair Value, Available for Sale	75,976
More than five years through ten years, Amortized Cost, Held to Maturity	1,145
More than five years through ten years, Fair Value, Held to Maturity	1,142
More than ten years, Amortized Cost, Available for Sale	33,878
More than ten years, Fair Value, Available for Sale	33,990
Total, Amortized Cost, Available for Sale	427,113
Total, Fair Value, Available for Sale	426,218
Held-to-maturity Securities, Total	10,443	$ 11,797
Fair Value, Held to Maturity	$ 10,677	$ 12,282

Investment Securities (Summar59

Investment Securities (Summary Of Sales Of Available For Sale Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment Securities [Abstract]
Proceeds from sales	$ 43,593	$ 162	$ 2,545
Gross realized gains	348	$ 162	$ 1,120
Gross realized losses	$ (54)

Investment Securities (Summar60

Investment Securities (Summary Of Securities With Gross Unrealized Losses And Their Fair Values) (Details) $ in Thousands	Dec. 31, 2016USD ($)security	Dec. 31, 2015USD ($)security
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	143	124
Number of Securities, Held to Maturity | security	7	1
Amortized cost of securities with unrealized losses, Available for Sale	$ 293,273	$ 253,872
Amortized cost of securities with unrealized losses, Held to Maturity	1,987	1,677
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(1,874)	(1,632)
Continuous Unrealized Loss Existing for Less Than 12 Months, Held to Maturity	(8)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(641)	(1,097)
Continuous Unrealized Loss Existing for More Than 12 Months, Held to Maturity		(3)
Fair value of securities with unrealized losses, Available for Sale	290,758	251,143
Fair value of securities with unrealized losses, Held to Maturity	$ 1,979	$ 1,674
Federal Agency Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	13	14
Amortized cost of securities with unrealized losses, Available for Sale	$ 34,734	$ 42,438
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(111)	(138)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(87)	(235)
Fair value of securities with unrealized losses, Available for Sale	$ 34,536	$ 42,065
Obligations Of State And Political Subdivisions [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	36	14
Number of Securities, Held to Maturity | security	7
Amortized cost of securities with unrealized losses, Available for Sale	$ 18,283	$ 11,765
Amortized cost of securities with unrealized losses, Held to Maturity	1,987
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(145)	(57)
Continuous Unrealized Loss Existing for Less Than 12 Months, Held to Maturity	(8)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(46)	(77)
Fair value of securities with unrealized losses, Available for Sale	18,092	$ 11,631
Fair value of securities with unrealized losses, Held to Maturity	$ 1,979
Residential Mortgage-Backed Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	89	87
Amortized cost of securities with unrealized losses, Available for Sale	$ 225,986	$ 175,043
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(1,618)	(1,247)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(348)	(605)
Fair value of securities with unrealized losses, Available for Sale	$ 224,020	$ 173,191
Asset-Backed Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	3	3
Amortized cost of securities with unrealized losses, Available for Sale	$ 9,265	$ 9,639
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale		(115)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(88)	(109)
Fair value of securities with unrealized losses, Available for Sale	$ 9,177	$ 9,415
Other Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	2	6
Amortized cost of securities with unrealized losses, Available for Sale	$ 5,005	$ 14,987
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale		(75)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(72)	(71)
Fair value of securities with unrealized losses, Available for Sale	$ 4,933	$ 14,841

Loans And Allowance For Loan 61

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days for independent appraisals on real estate collateral	30 days
Loans held for sale	$ 4,400	$ 7,500
Period to sell loans from the date of closing	1 month
Accrued additional interest income	$ 1,000	800	$ 700
Cumulative charge-offs against noncovered nonaccrual loans	3,300	6,100
Interest income recognized on troubled debt restructurings	$ 900	1,200	$ 1,000
Troubled debt restructuring default period	90 days
Troubled debt restructuring Period	12 months
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to individuals and businesses	$ 608,600
Percentage of loans to individuals and businesses	32.00%
Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to individuals and businesses	$ 423,800
Percentage of loans to individuals and businesses	23.00%
Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal of mortgage loans serviced for others	$ 460,100	$ 432,300

Loans And Allowance For Loan 62

Loans And Allowance For Loan Losses (Southwest's Loan Classifications) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,877,132	$ 1,779,429
Less: Allowance for loan losses	(27,546)	(26,106)
Total loans, net	1,849,586	1,753,323
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	556,248	507,173
Installment And Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	19,631	21,429
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	882,071	938,462
Commercial Real Estate [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	199,113	129,070
One-To-Four Family Residential [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	199,123	161,958
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 20,946	$ 21,337

Loans And Allowance For Loan 63

Loans And Allowance For Loan Losses (Recorded Investment In Loans On Nonaccrual Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 16,267	$ 19,858
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	6,471	3,543
Commercial Real Estate Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	2,766	1,729
Residential Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	522	562
Residential Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	448	448
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	5,949	13,491
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 111	$ 85

Loans And Allowance For Loan 64

Loans And Allowance For Loan Losses (Age Analysis Of Past Due Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 20,154	$ 21,522
Current	1,856,978	1,757,907
Loans receivable	1,877,132	1,779,429	$ 1,399,991
Recorded loans > 90 days and accruing	343	500
30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,544	1,164
90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	16,610	20,358
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	882,071	938,462	752,971
One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	199,123	161,958	77,531
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,496	4,264
Current	875,575	934,198
Loans receivable	882,071	938,462
Recorded loans > 90 days and accruing		449
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	24	272
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,472	3,992
Commercial Real Estate Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,534	2,326
Current	195,589	159,632
Loans receivable	199,123	161,958
Recorded loans > 90 days and accruing	138	48
Commercial Real Estate Portfolio Segment [Member] | One-To-Four Family Residential [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	631	549
Commercial Real Estate Portfolio Segment [Member] | One-To-Four Family Residential [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,903	1,777
Residential Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	522	493
Current	198,591	128,577
Loans receivable	199,113	129,070
Residential Portfolio Segment [Member] | Commercial Real Estate [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	522	493
Residential Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	448	517
Current	20,498	20,820
Loans receivable	20,946	21,337
Residential Portfolio Segment [Member] | One-To-Four Family Residential [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	448	517
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	220,059	150,407	197,123
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,672	13,769
Current	547,576	493,404
Loans receivable	556,248	507,173	$ 350,410
Recorded loans > 90 days and accruing	193
Commercial Portfolio Segment [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,530	278
Commercial Portfolio Segment [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,142	13,491
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	482	153
Current	19,149	21,276
Loans receivable	19,631	21,429
Recorded loans > 90 days and accruing	12	3
Consumer Portfolio Segment [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	359	65
Consumer Portfolio Segment [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 123	$ 88

Loans And Allowance For Loan 65

Loans And Allowance For Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	$ 4,629	$ 19,112
With No Specific Allowance Unpaid Principal Balance	8,494	24,793
With A Specific Allowance Recorded Investment	12,816	20,969
With A Specific Allowance Unpaid Principal Balance	15,952	27,094
With A Specific Allowance Related Allowance	3,668	4,112
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	1,536	12,166
With No Specific Allowance Unpaid Principal Balance	3,057	15,747
With A Specific Allowance Recorded Investment	6,053	10,940
With A Specific Allowance Unpaid Principal Balance	6,529	10,940
With A Specific Allowance Related Allowance	2,219	1,575
One-To-Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	1,188	1,688
With No Specific Allowance Unpaid Principal Balance	1,535	2,195
With A Specific Allowance Recorded Investment	1,593	185
With A Specific Allowance Unpaid Principal Balance	1,698	186
With A Specific Allowance Related Allowance	63	11
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	762	1,078
With No Specific Allowance Unpaid Principal Balance	926	1,327
With A Specific Allowance Recorded Investment	207
With A Specific Allowance Unpaid Principal Balance	245
With A Specific Allowance Related Allowance	40
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	1,032	4,095
With No Specific Allowance Unpaid Principal Balance	2,861	5,430
With A Specific Allowance Recorded Investment	4,963	9,844
With A Specific Allowance Unpaid Principal Balance	7,480	15,968
With A Specific Allowance Related Allowance	1,346	2,526
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	111	85
With No Specific Allowance Unpaid Principal Balance	$ 115	$ 94

Loans And Allowance For Loan 66

Loans And Allowance For Loan Losses (Average Recorded Investment And Interest Income Recognized On Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 18,848	$ 36,942	$ 40,977
Interest Income	878	1,186	1,037
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	7,394	25,044	30,257
Interest Income	750	970	968
One-To-Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,448	2,323	2,764
Interest Income	15	1	1
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,050	997	222
Interest Income	14
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6,905	8,527	7,718
Interest Income	96	215	68
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	52	$ 51	$ 16
Interest Income	$ 3

Loans And Allowance For Loan 67

Loans And Allowance For Loan Losses (Troubled Debt Restructured Loans Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Accruing	$ 1,178	$ 20,235
Nonaccrual	3,844	6,292
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	45	659
Nonaccrual	3,323	5,796
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,118	19,563
Nonaccrual	475	448
One-To-Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Accruing	15	13
Nonaccrual	$ 46	$ 48

Loans And Allowance For Loan 68

Loans And Allowance For Loan Losses (Loans Modified As Troubled Debt Restructurings) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Modifications | contract	2	1
Recorded Investment | $	$ 188	$ 5,511
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | contract	1
Recorded Investment | $	$ 164
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | contract	1	1
Recorded Investment | $	$ 24	$ 5,511

Loans And Allowance For Loan 69

Loans And Allowance For Loan Losses (Recorded Investment And The Number Of Loans Modified As Troubled Debt Restructuring Which Subsequently Defaulted) (Details)	24 Months Ended
	Dec. 31, 2016loan
Loans And Allowance For Loan Losses [Abstract]
Number of Contracts	0

Loans And Allowance For Loan 70

Loans And Allowance For Loan Losses (Classification Of Risk Category Of Loans, By Classes) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 1,877,132	$ 1,779,429	$ 1,399,991
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,778,022	1,710,969
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	38,821	9,522
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	59,894	54,482
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	395	4,456
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	220,059	150,407	197,123
Real Estate Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	210,780	148,811
Real Estate Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,720	586
Real Estate Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,559	1,010
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	556,248	507,173	350,410
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	498,039	480,928
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	24,639	2,941
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	33,175	18,848
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	395	4,456
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,631	21,429	21,956
Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,518	21,284
Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable		50
Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	113	95
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	882,071	938,462	752,971
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	857,290	902,034
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,479	5,916
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	20,302	30,512
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	882,071	938,462
Commercial Real Estate [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	199,113	129,070
One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	199,123	161,958	$ 77,531
One-To-Four Family Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	192,395	157,912
One-To-Four Family Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,983	29
One-To-Four Family Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	4,745	4,017
One-To-Four Family Residential [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	199,123	161,958
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 20,946	$ 21,337

Loans And Allowance For Loan 71

Loans And Allowance For Loan Losses (By Balance In The Allowance For Loan Losses And The Recorded Investment In Loans Portfolio Classification Disaggregated On The Basis Of Impairment Evaluation Method) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period	$ 26,106	$ 28,452	$ 36,663
Loans charged-off	(6,997)	(1,351)	(6,916)
Recoveries	3,668	2,571	5,329
Provision (credit) for loan losses	4,769	(3,566)	(6,624)
Balance at end of period	27,546	26,106	28,452
Individually evaluated for impairment				$ 3,628	$ 4,112	$ 3,869
Collectively evaluated for impairment				23,878	21,994	24,583
Total ending allowance balance	26,106	28,452	36,663	27,546	26,106	28,452
Individually evaluated for impairment				14,119	34,861	38,111
Collectively evaluated for impairment				1,858,381	1,736,654	1,356,909
Acquired With Deteriorated Credit Quality				4,632	7,914	4,971
Total ending loans balance				1,877,132	1,779,429	1,399,991
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at end of period	40
Total ending allowance balance	40			40
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period	2,533	4,159	5,523
Loans charged-off		(21)	(655)
Recoveries		47
Provision (credit) for loan losses	969	(1,652)	(709)
Balance at end of period	3,502	2,533	4,159
Collectively evaluated for impairment				3,462	2,533	4,159
Total ending allowance balance	2,533	4,159	5,523	3,502	2,533	4,159
Individually evaluated for impairment				390	391	104
Collectively evaluated for impairment				219,015	149,344	196,905
Acquired With Deteriorated Credit Quality				654	672	114
Total ending loans balance				220,059	150,407	197,123
Real Estate Construction [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at end of period	40
Total ending allowance balance	40			40
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period	9,965	9,614	10,985
Loans charged-off	(6,148)	(628)	(4,014)
Recoveries	3,079	1,479	1,119
Provision (credit) for loan losses	3,162	(500)	1,524
Balance at end of period	10,058	9,965	9,614
Individually evaluated for impairment				1,346	2,526	1,822
Collectively evaluated for impairment				8,712	7,439	7,792
Total ending allowance balance	9,965	9,614	10,985	10,058	9,965	9,614
Individually evaluated for impairment				5,357	13,396	13,560
Collectively evaluated for impairment				550,615	493,026	336,818
Acquired With Deteriorated Credit Quality				276	751	32
Total ending loans balance				556,248	507,173	350,410
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance				19,631	21,429
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period	192	289	451
Loans charged-off	(522)	(193)	(558)
Recoveries	112	205	264
Provision (credit) for loan losses	534	(109)	132
Balance at end of period	316	192	289
Collectively evaluated for impairment				316	192	289
Total ending allowance balance	192	289	451	316	192	289
Individually evaluated for impairment					47	2
Collectively evaluated for impairment				19,631	21,370	21,953
Acquired With Deteriorated Credit Quality					12	1
Total ending loans balance				19,631	21,429	21,956
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period	12,716	13,678	18,854
Loans charged-off	(193)	(489)	(1,400)
Recoveries	400	282	3,733
Provision (credit) for loan losses	(416)	(755)	(7,509)
Balance at end of period	12,507	12,716	13,678
Individually evaluated for impairment				2,219	1,575	2,047
Collectively evaluated for impairment				10,288	11,141	11,631
Total ending allowance balance	12,716	13,678	18,854	12,507	12,716	13,678
Individually evaluated for impairment				6,606	20,332	23,907
Collectively evaluated for impairment				872,997	913,242	725,635
Acquired With Deteriorated Credit Quality				2,468	4,888	3,429
Total ending loans balance				882,071	938,462	752,971
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance				882,071	938,462
Commercial Real Estate [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance				199,113	129,070
One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period	700	712	850
Loans charged-off	(134)	(20)	(289)
Recoveries	77	558	213
Provision (credit) for loan losses	520	(550)	(62)
Balance at end of period	1,163	700	712
Individually evaluated for impairment				63	11
Collectively evaluated for impairment				1,100	689	712
Total ending allowance balance	$ 700	$ 712	$ 850	1,163	700	712
Individually evaluated for impairment				1,766	695	538
Collectively evaluated for impairment				196,123	159,672	75,598
Acquired With Deteriorated Credit Quality				1,234	1,591	1,395
Total ending loans balance				199,123	161,958	$ 77,531
One-To-Four Family Residential [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance				199,123	161,958
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance				$ 20,946	$ 21,337

Premises And Equipment (Narrati

Premises And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Premises And Equipment [Abstract]
Depreciation of premises and equipment	$ 2.8	$ 2.5	$ 2.8
Total rental expense	$ 3.6	$ 2.9	$ 2.4

Premises And Equipment (Premise

Premises And Equipment (Premises And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Premises And Equipment [Abstract]
Land	$ 6,630	$ 6,630
Buildings and improvements	25,861	25,219
Furniture, fixtures, and equipment	32,409	30,813
Construction/remodeling in progress	38	965
Total premises and equipment, gross	64,938	63,627
Accumulated depreciation and amortization	(42,130)	(39,808)
Total premises and equipment, net	$ 22,808	$ 23,819

Premises And Equipment (Future

Premises And Equipment (Future Minimum Annual Rental Payments) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Premises And Equipment [Abstract]
2,017	$ 2,723
2,018	2,277
2,019	2,091
2,020	2,016
2,021	1,333
Thereafter	2,822
Total	$ 13,262

Goodwill And Other Intangible75

Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 09, 2015
Goodwill impairment		$ 0	$ 0	$ 0
Goodwill		$ 13,545,000	13,467,000	1,942,034,000	$ 12,300,000
Weighted average amortization period for Core Deposit Intangibles		10 years
Impairment on Core Deposit Premiums		$ 0	0	0
Servicing Asset at Amortized Cost		3,500,000
Fair value of loan servicing rights		4,200,000	3,700,000
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ 600,000		100,000
Oklahoma Banking [Member]
Goodwill		12,525,000		805,704,000	$ 12,300,000
Texas Banking [Member]
Goodwill		1,020,000		458,489,000
Core Deposits [Member]
Amortization		600,000	300,000	400,000
Servicing Contracts [Member]
Amortization		$ 700,000	$ 600,000	$ 400,000

Goodwill and Other Intangible76

Goodwill and Other Intangible Assets (Gross Carrying Amount of Other Intangible Assets and Accumulated Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Intangible assets, net	$ 5,790	$ 6,615
Core Deposits [Member]
Finite-Lived Intangible Assets, Gross	6,119	6,119
Finite-Lived Intangible Assets, Accumulated Amortization	(3,820)	(3,225)
Other Intangible assets, net	2,299	2,894
Servicing Contracts [Member]
Finite-Lived Intangible Assets, Gross	14,710	13,635
Finite-Lived Intangible Assets, Accumulated Amortization	(11,219)	(9,914)
Other Intangible assets, net	$ 3,491	$ 3,721

Goodwill and Other Intangible77

Goodwill and Other Intangible Assets (Estimated Aggregate Future Amortization Expense for Other Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
2,017	$ 1,105
2,018	962
2,019	864
2,020	782
2,021	709
Thereafter	1,368
Other Intangible assets, net	5,790	$ 6,615
Core Deposits [Member]
2,017	451
2,018	391
2,019	386
2,020	386
2,021	386
Thereafter	299
Other Intangible assets, net	2,299	2,894
Servicing Contracts [Member]
2,017	654
2,018	571
2,019	478
2,020	396
2,021	323
Thereafter	1,069
Other Intangible assets, net	$ 3,491	$ 3,721

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Fair value of loan servicing rights		$ 3.7	$ 4.2
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ 0.6	0.1
Noncovered [Member]
Finite-Lived Intangible Assets [Line Items]
Noncovered impaired loans carrying amount		25.9	19.7
Noncovered impaired loans measured at fair value		21.6	13.2
Noncovered impaired loans life to date impairment		4.3	$ 6.5
Impairment charge of other real estate assets		$ 0.1

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 426,218	$ 400,331
Derivative asset	1,235	1,793
Derivative liability	(1,235)	(1,793)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,235	1,793
Total Assets at Fair Value on a recurring basis	425,563	398,961
Fair Value, Measurements, Recurring [Member] | Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	69,694	78,211
Fair Value, Measurements, Recurring [Member] | Obligations Of State And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	46,375	47,564
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	280,642	239,888
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	9,177	9,415
Fair Value, Measurements, Recurring [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	20,330	25,253
Fair Value, Measurements, Recurring [Member] | Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	(1,890)	(3,163)
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Assets at Fair Value on a recurring basis	213	137
Fair Value, Measurements, Recurring [Member] | Level 1 Inputs [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	213	137
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,235	1,793
Total Assets at Fair Value on a recurring basis	425,350	398,824
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Federal Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	69,694	78,211
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Obligations Of State And Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	46,375	47,564
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	280,642	239,888
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	9,177	9,415
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	20,117	25,116
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member] | Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ (1,890)	$ (3,163)

Fair Value Measurements (Asset

Fair Value Measurements (Asset Measured At Fair Value On A Nonrecurring Basis) (Details) - Fair Value Measurements Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Noncovered impaired loans at fair value:
Assets fair value, Total	$ 17,596	$ 35,050
Commercial Real Estate [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	6,053	11,182
One-To-Four Family Residential [Member]
Noncovered impaired loans at fair value:
Loans held for sale	4,386	7,453
Assets fair value, Total	1,593	185
Real Estate Construction [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	207	390
Commercial [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	5,357	9,845
Noncovered Other Real Estate [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		2,274
Mortgage Loan Servicing Rights [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		3,721
Level 2 Inputs [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	4,386	11,174
Level 2 Inputs [Member] | One-To-Four Family Residential [Member]
Noncovered impaired loans at fair value:
Loans held for sale	4,386	7,453
Level 2 Inputs [Member] | Mortgage Loan Servicing Rights [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		3,721
Level 3 Inputs [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	13,210	23,876
Level 3 Inputs [Member] | Commercial Real Estate [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	6,053	11,182
Level 3 Inputs [Member] | One-To-Four Family Residential [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	1,593	185
Level 3 Inputs [Member] | Real Estate Construction [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	207	390
Level 3 Inputs [Member] | Commercial [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	$ 5,357	9,845
Level 3 Inputs [Member] | Noncovered Other Real Estate [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		$ 2,274

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Values And Estimated Fair Values Of Financial Instruments Segregated By The Level Of The Valuation Inputs) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Assets:
Held to maturity securities, fair value	$ 10,677	$ 12,282
Accrued interest receivable	6,194	5,767
Servicing Asset at Amortized Cost	3,500
Mortgage loan servicing rights	4,200
Bank owned life insurance	28,575	27,676
Derivative Assets	1,235	1,793
Financial Liabilities:
Accrued interest payable	1,132	867
Derivative instrument	1,235	1,793
Other borrowings	183,814	110,927
Carrying Values [Member] | Level 2 Inputs [Member]
Financial Assets:
Cash and cash equivalents	75,650	78,129
Held to maturity securities, fair value	10,443	11,797
Accrued interest receivable	6,194	5,767
Mortgage loan servicing rights	3,491	3,721
Bank owned life insurance	28,575	27,676
Investments included in other assets	14,627	10,383
Financial Liabilities:
Deposits	1,946,018	1,884,105
Accrued interest payable	1,132	867
Other liabilities	9,516	10,314
Other borrowings	183,814	110,927
Subordinated debentures	46,393	51,548
Carrying Values [Member] | Level 3 Inputs [Member]
Financial Assets:
Total loans, net of allowance	1,849,586	1,753,323
Fair Values [Member] | Level 2 Inputs [Member]
Financial Assets:
Cash and cash equivalents	75,650	78,129
Held to maturity securities, fair value	10,677	12,282
Accrued interest receivable	6,194	5,767
Mortgage loan servicing rights	4,159	3,721
Bank owned life insurance	28,575	27,676
Investments included in other assets	14,627	10,383
Financial Liabilities:
Deposits	1,897,927	1,780,954
Accrued interest payable	1,132	867
Other liabilities	9,516	10,314
Other borrowings	183,926	112,149
Subordinated debentures	46,393	51,548
Fair Values [Member] | Level 3 Inputs [Member]
Financial Assets:
Total loans, net of allowance	$ 1,839,960	$ 1,728,114

Deposits (Narrative) (Details)

Deposits (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Deposit Liabilities Reclassified as Loans Receivable	$ 300	$ 300
Time Deposits $250,000 or More	122,000	95,400
Certificate of Deposits Account Registry Services Deposits	29,000	22,500
Capital Market Certificate of Deposits	$ 35,600	$ 17,300

Deposits (Schedule Of Deposits)

Deposits (Schedule Of Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Noninterest-bearing demand	$ 551,709	$ 596,494
Interest-bearing demand	152,656	151,015
Money market accounts	567,058	534,357
Savings accounts	56,410	56,333
Time deposits of $100,000 or more	360,307	311,538
Other time deposits	257,878	234,368
Total deposits	$ 1,946,018	$ 1,884,105	$ 1,533,999

Deposits (Time Deposits Maturit

Deposits (Time Deposits Maturities) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Deposits [Abstract]
2,017	$ 465,324
2,018	115,862
2,019	22,025
2,020	8,372
2,021	6,575
Thereafter	27
Total time deposits	$ 618,185

Borrowed Funds (Narrative) (Det

Borrowed Funds (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)entity	Dec. 31, 2015USD ($)
Federal funds purchase line available under repurchase agreements	$ 60
Number of Entities with Repurchase Agreement Lines Available | entity	3
Repurchase Agreement transaction period	one-to-four day
Loans pledged under FHLB agreement	$ 577.7	$ 447.9
Investment Securities Pledged Under FHLB Agreement	0	0
Collateral Pledged For Repurchase Agreements	61.5	$ 58.9
First Year of Scheduled FHLB Principal Payments	138
Line of Credit Facility, Maximum Borrowing Capacity	106.7
Bank SNB [Member]
Federal Home Loan Bank Advances	$ 138

Borrowed Funds (Schedule Of Bor

Borrowed Funds (Schedule Of Borrowed Funds) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt	$ 183,814	$ 110,927
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt	45,814	37,273
Short-term Debt, Average Outstanding Amount	$ 45,812	$ 44,218
Short-term Debt, Weighted Average Interest Rate	0.05%	0.07%
Federal Home Loan Bank Advances [Member]
Short-term Debt	$ 138,000	$ 73,654
Short-term Debt, Average Outstanding Amount	$ 97,569	$ 28,289
Short-term Debt, Weighted Average Interest Rate	1.31%	3.11%

Trust Preferred Securities an87

Trust Preferred Securities and Subordinated Debentures (Narrative) (Details) - USD ($)	Oct. 14, 2003	Jun. 26, 2003	Dec. 31, 2016	Dec. 31, 2015	Sep. 04, 2003
Subordinated Borrowing [Line Items]
Trust Preferred Securities			$ 45,000,000	$ 50,000,000
Subordinated debentures			46,393,000	51,548,000
Investment in common equity issued by Trusts			$ 1,400,000
Federal Reserve Limit On Trust Preferred			25.00%
OKSB Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Trust Preferred Securities		$ 20,000,000	$ 20,000,000	20,000,000
Adjustable rate			90-day LIBOR
Adjustable rate, additional percentage			3.10%
Amount of trust common equity sold to Southwest		$ 600,000
Subordinated debentures			$ 20,619,000	20,619,000
Outstanding common securities of the Trust		619
Trust liquidation value per share		$ 1,000
SBI Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Trust Preferred Securities	$ 25,000,000		$ 25,000,000	25,000,000
Adjustable rate			90-day LIBOR
Adjustable rate, additional percentage			2.85%
Amount of trust common equity sold to Southwest	$ 800,000
Subordinated debentures			$ 25,774,000	25,774,000
Outstanding common securities of the Trust	774
Trust liquidation value per share	$ 1,000
FCBI Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Trust Preferred Securities				5,000,000	$ 5,000,000
Adjustable rate			90-day LIBOR
Adjustable rate, additional percentage			3.00%
Amount of trust common equity sold to Southwest					200,000
Subordinated debentures				$ 5,155,000
OKSB Subordinated Debentures [Member]
Subordinated Borrowing [Line Items]
Adjustable rate			90-day LIBOR
Adjustable rate, additional percentage			3.10%
Principal amount of subordinated debentures		$ 20,600,000
SBI II Subordinated Debentures [Member]
Subordinated Borrowing [Line Items]
Adjustable rate			90-day LIBOR
Adjustable rate, additional percentage			2.85%
Principal amount of subordinated debentures	$ 25,800,000
FCBI I Subordinated Debentures [Member]
Subordinated Borrowing [Line Items]
Adjustable rate			90-day LIBOR
Adjustable rate, additional percentage			3.00%
Principal amount of subordinated debentures					$ 5,200,000
Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Tier one capital			$ 45,000,000

Trust Preferred Securities an88

Trust Preferred Securities and Subordinated Debentures (Schedule of Trust Preferred Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Oct. 14, 2003	Sep. 04, 2003	Jun. 26, 2003
Subordinated Borrowing [Line Items]
Subordinated debentures	$ 46,393	$ 51,548
Trust Preferred Securities of the Trusts	45,000	50,000
OKSB Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures	20,619	20,619
Trust Preferred Securities of the Trusts	$ 20,000	$ 20,000			$ 20,000
Rates	4.10%	3.70%
Final Maturity Date	Jun. 26, 2033	Jun. 26, 2033
SBI Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures	$ 25,774	$ 25,774
Trust Preferred Securities of the Trusts	$ 25,000	$ 25,000	$ 25,000
Rates	3.73%	3.17%
Final Maturity Date	Oct. 7, 2033	Oct. 7, 2033
FCBI Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures		$ 5,155
Trust Preferred Securities of the Trusts		$ 5,000		$ 5,000
Rates		3.33%
Final Maturity Date		Sep. 4, 2033

Derivative Instruments (Details

Derivative Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)agreement	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Derivative [Line Items]
Interest rate swap agreement Notional amount	$ 34,700
The fair value of cash and securities posted as collateral	700	$ 1,400
Interest Rate Swap on Trust Preferred Securities [Member]
Derivative [Line Items]
Interest rate swap agreement Notional amount	$ 25,000
Interest payment period	7 years
Fixed interest rate	6.15%
Variable interest rate	2.85%
Rate received by Southwest	3.73%
Pretax loss related to derivative contracts	$ 700	1,400
Gain or loss due to changes in the fair value of the derivative hedging instrument	400	100
Net cash flows as a result of the interest rate swap agreement	$ 700	800	$ 800
Customer Risk Management Swaps [Member]
Derivative [Line Items]
Number of customer interest rate swap agreements | agreement	9
Derivative Asset, Notional Amount	$ 123,953	101,629
Derivative Liability, Notional Amount	123,953	101,629
Non-hedge derivative asset, fair value	1,235	1,793
Non-hedge derivative liability, fair value	$ 1,235	$ 1,793

Taxes On Income (Details)

Taxes On Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective tax rate	35.70%	36.00%	37.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax				$ 2,500
Net deferred tax assets	$ 13,155	$ 13,953
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforward Expiration Date				2,031
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration				$ 10,700
State and Local Jurisdiction [Member]
Operating Loss Carryforward Expiration Date	2,031			2,031
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 10,300			$ 53,100
State And Local Jurisdiction Second Expiration [Member]
Operating Loss Carryforward Expiration Date				2,021
Deferred Tax Assets, Operating Loss Carryforwards, State and Local				$ 600

Taxes On Income (Tax Components

Taxes On Income (Tax Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current tax (benefit) expense:
Federal	$ 8,809	$ 7,534	$ 3,251
State	173	143	186
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	44	1,126	7,970
State	783	990	1,210
Income Tax Expense (Benefit), Total	$ 9,809	$ 9,793	$ 12,617

Taxes On Income (Reconciliation

Taxes On Income (Reconciliation from the Expected Tax Expense (Benefit) Using the U.S. Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Taxes On Income [Abstract]
Computed tax (benefit) expense at statutory rates	$ 9,630	$ 9,520	$ 11,777
Increase (decrease) in income taxes results from:
Benefit of income not subject to U.S. Federal income tax	(632)	(621)	(209)
Expenses not deductible for U.S. Federal income tax	216	220	129
State income taxes, net of Federal income tax benefit	621	736	907
Other	(26)	(62)	13
Income Tax Expense (Benefit), Total	$ 9,809	$ 9,793	$ 12,617

Taxes on Income (Temporary Diff

Taxes on Income (Temporary Differences That Give Rise to the Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Provision for loan losses	$ 10,976	$ 10,291
Net operating loss carryforward	380	858
Write-down on other real estate		57
Nonaccrual loan interest	510	603
Deferred compensation & profit sharing accrual	782	711
Investments	306	311
Section 597 gain - FDIC-assisted acquistion	388	472
Accrued expenses	859	1,013
Loan purchase accounting adjustment	1,392	2,725
Stock-based compensation	805	629
Other	659	(2)
Total deferred tax assets	17,057	17,668
Deferred tax liabilities:
Accumulated depreciation	(2,966)	(2,877)
Amortizable assets	(933)	(1,089)
Dividend - Equity vs. Cost Method	(471)	(393)
Prepaid expenses	(110)	(109)
FHLB stock dividends	(65)	(132)
Total deferred tax liabilities	(4,545)	(4,600)
Deferred taxes payable on investment securities available for sale	643	885
Net deferred tax assets	$ 13,155	$ 13,953

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended		29 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	May 25, 2016
Treasury Stock, Shares, Acquired	1,398,026		2,519,584
Treasury Stock, Amount, Acquired	$ 22.1		$ 40.8
Employee Stock Purchase Plan [Member]
Common stock reserved for issuance	150,000		150,000
Common stock issued, shares	61,115	59,873
Treasury shares reissued	52,500	52,500
2008 Stock Based Award Plan [Member]
Common stock reserved for issuance	800,000		800,000
Common stock issued, shares	603,545	512,101
Treasury shares reissued	25,725	25,725
2016 Stock Repurchase Program [Member]
Stock Repurchase Program Authorized Percent Of Common Stock				5.00%
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				921,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income	$ 17,704	$ 17,407	$ 21,030
Earnings allocated to participating securities	(279)	(258)	(253)
Numerator for earnings per common share	$ 17,425	$ 17,149	$ 20,777
Denominator:
Denominator for basic earnings per common share	18,660,951	18,975,450	19,417,486
Effect of dilutive securities:
Stock compensation	205,916	148,059	142,877
Denominator for diluted earnings per common share	18,866,867	19,123,509	19,560,363
Earnings per common share:
Basic	$ 0.93	$ 0.90	$ 1.07
Diluted	$ 0.92	$ 0.90	$ 1.06
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,573	38,145	0

Capital Requirements And Regu96

Capital Requirements And Regulatory Agreements (Southwest’s and Bank SNB's Actual Capital Amounts And Ratios) (Details) $ in Thousands	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Southwest [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital, Actual, Amount	$ 272,882	$ 282,737
CET1 Capital to risk-weighted assets, Actual, Ratio	12.36	13.21
CET1 Capital, To Be Well Capitalized, Amount	$ 143,488	$ 139,122
CET1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio	6.50	6.50
CET1 Capital, For Capital Adequacy Purposes, Amount	$ 99,338	$ 96,316
CET1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	4.50	4.50
Total Capital, Actual, Amount	$ 345,597	$ 359,300
Total Capital to risk-weighted assets, Actual, Ratio	15.66%	16.79%
Total Capital, To Be Well Capitalized, Amount	$ 220,751	$ 214,034
Total Capital to risk-weighted assets, To Be Well Capitalized, Ratio	10.00%	10.00%
Total Capital, For Capital Adequacy Purposes, Amount	$ 176,601	$ 171,228
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital, Actual, Amount	$ 317,882	$ 332,468
Tier 1 Capital to risk-weighted assets, Actual, Ratio	14.40%	15.53%
Tier 1 Capital, To Be Well Capitalized, Amount	$ 176,601	$ 171,228
Tier 1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio	8.00%	8.00%
Tier 1 Capital, For Capital Adequacy Purposes, Amount	$ 132,450	$ 128,421
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 Leverage, Actual, Amount	$ 317,882	$ 332,468
Tier 1 Leverage to average assets, Actual, Ratio	13.02%	14.41%
Tier 1 Leverage, To Be Well Capitalized, Amount	$ 122,046	$ 115,371
Tier 1 Leverage to average assets, To Be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount	$ 97,637	$ 92,297
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Bank SNB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital, Actual, Amount	$ 301,023	$ 291,125
CET1 Capital to risk-weighted assets, Actual, Ratio	13.66	13.65
CET1 Capital, To Be Well Capitalized, Amount	$ 143,189	$ 138,637
CET1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio	6.50	6.50
CET1 Capital, For Capital Adequacy Purposes, Amount	$ 99,131	$ 95,980
CET1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	4.50	4.50
Total Capital, Actual, Amount	$ 328,681	$ 317,865
Total Capital to risk-weighted assets, Actual, Ratio	14.92%	14.90%
Total Capital, To Be Well Capitalized, Amount	$ 220,291	$ 213,288
Total Capital to risk-weighted assets, To Be Well Capitalized, Ratio	10.00%	10.00%
Total Capital, For Capital Adequacy Purposes, Amount	$ 176,232	$ 170,631
Total Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital, Actual, Amount	$ 301,023	$ 291,125
Tier 1 Capital to risk-weighted assets, Actual, Ratio	13.66%	13.65%
Tier 1 Capital, To Be Well Capitalized, Amount	$ 176,232	$ 170,631
Tier 1 Capital to risk-weighted assets, To Be Well Capitalized, Ratio	8.00%	8.00%
Tier 1 Capital, For Capital Adequacy Purposes, Amount	$ 132,174	$ 127,973
Tier 1 Capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 Leverage, Actual, Amount	$ 301,023	$ 291,125
Tier 1 Leverage to average assets, Actual, Ratio	12.37%	12.66%
Tier 1 Leverage, To Be Well Capitalized, Amount	$ 121,686	$ 114,939
Tier 1 Leverage to average assets, To Be Well Capitalized, Ratio	5.00%	5.00%
Tier 1 Leverage, For Capital Adequacy Purposes, Amount	$ 97,349	$ 91,951
Tier 1 Leverage to average assets, For Capital Adequacy Purposes, Ratio	4.00%	4.00%

Employee Benefits (Narrative) (

Employee Benefits (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Maximum percentage of elegible compensation able to be contributed to the defined contribution plan	90.00%
Employer match contribution		3.00%	3.00%
Amount contributed to the defined contribution plan	$ 800,000	$ 700,000	$ 600,000
Share-based compensation expense	$ 0	$ 0	$ 0
Restricted shares granted	546,895	462,024	453,987
Recognized compensation expense related to restricted shares outstanding	$ 1,500,000	$ 1,300,000	$ 600,000
Unrecognized compensation expense, expected to be recognized in next fiscal year	$ 1,000,000
Unrecognized compensation expense, period of recognition	2 years
Number of Options Outstanding	0	0
Exercised, Number of Options	0	0	0
Expiration period of restricted shares	1 year
Restricted Stock [Member]
Unrecognized compensation expense related to restricted shares granted	$ 1,600,000
Maximum [Member]
Vesting period of restriced stock	3 years
Minimum [Member]
Vesting period of restriced stock	1 year

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Related Party Transactions [Abstract]
Related party indebtedness	$ 14,200,000	$ 26,100,000
New loans and advances on existing loans	26,900,000	41,200,000
Related party loan repayments	38,900,000	24,200,000
Related party deposits	1,800,000	2,100,000
Related party savings and interest-bearing transaction accounts	13,200,000	14,000,000
Related party time certificates of deposit	$ 0	$ 500,000

Off-Balance-Sheet Arrangements,

Off-Balance-Sheet Arrangements, Commitments, Guarantees And Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies [Abstract]
Commitments to extend commercial and real estate mortgage credit	$ 429,383	$ 446,412
Standby and commercial letters of credit	7,160	6,595
Total	436,543	$ 453,007
Maximum amount payable for Severance Compensation Plan	$ 12,100

Operating Segments (Narrative)

Operating Segments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016segment
Operating Segments [Abstract]
Number of principal segments	4

Operating Segments (Financial R

Operating Segments (Financial Results By Operating Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 09, 2015
Financial results by operating segment
Net interest income (loss)	$ 79,443	$ 67,417	$ 65,004
Provision (credit) for loan losses	4,769	(3,566)	(6,624)
Noninterest income	16,085	14,457	18,931
Noninterest expenses	63,246	58,240	56,912
Income before taxes	27,513	27,200	33,647
Taxes on income (loss)	9,809	9,793	12,617
Net income	17,704	17,407	21,030
Total loans at period end	1,877,132	1,779,429	1,399,991
Total assets at period end	2,475,392	2,357,022	1,214
Total goodwill at period end	13,545	13,467	1,942,034	$ 12,300
Total deposits at period end	1,946,018	1,884,105	1,533,999
Oklahoma Banking [Member]
Financial results by operating segment
Net interest income (loss)	50,590		38,846
Provision (credit) for loan losses	2,007		(2,561)
Noninterest income	11,576		9,030
Noninterest expenses	40,083		31,363
Income before taxes	20,076		19,074
Taxes on income (loss)	7,157		7,152
Net income	12,919		11,922
Total loans at period end	1,095,930		793,262
Total assets at period end	1,138,969		194
Total goodwill at period end	12,525		805,704	$ 12,300
Total deposits at period end	1,330,176		1,113,477
Texas Banking [Member]
Financial results by operating segment
Net interest income (loss)	22,697		19,187
Provision (credit) for loan losses	973		(3,640)
Noninterest income	1,273		1,594
Noninterest expenses	13,734		13,387
Income before taxes	9,263		11,034
Taxes on income (loss)	3,303		4,138
Net income	5,960		6,896
Total loans at period end	636,643		460,680
Total assets at period end	633,328		1,020
Total goodwill at period end	1,020		458,489
Total deposits at period end	195,603		224,634
Kansas Banking [Member]
Financial results by operating segment
Net interest income (loss)	6,694		9,469
Provision (credit) for loan losses	1,786		(425)
Noninterest income	1,202		1,576
Noninterest expenses	5,275		8,616
Income before taxes	835		2,854
Taxes on income (loss)	298		1,070
Net income	537		1,784
Total loans at period end	144,559		146,043
Total assets at period end	143,558
Total goodwill at period end			147,256
Total deposits at period end	147,823		110,901
Other Operations [Member]
Financial results by operating segment
Net interest income (loss)	(538)		(2,498)
Provision (credit) for loan losses	3		2
Noninterest income	2,034		6,731
Noninterest expenses	4,154		3,546
Income before taxes	(2,661)		685
Taxes on income (loss)	(949)		257
Net income	(1,712)		428
Externally generated revenue from investing activities	3,000	2,100	7,600
Internally generated loss from fund management	1,500	$ 2,800	3,300
Total loans at period end			6
Total assets at period end	559,537
Total goodwill at period end			530,585
Total deposits at period end	$ 272,416		$ 84,987

Parent Company Condensed Fin102

Parent Company Condensed Financial Information (Statements Of Financial Condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash and cash equivalents	$ 75,650	$ 78,129	$ 140,936	$ 279,839
Available-for-sale Securities	426,218	400,331
Other assets	34,998	32,031
Total assets	2,475,392	2,357,022	1,214
Subordinated debentures	46,393	51,548
Other liabilities	10,171	11,684
Common stock and related accounts	21,231	21,138
Total liabilities & shareholders' equity	2,475,392	2,357,022
Parent Company [Member]
Cash and cash equivalents	12,105	30,469	$ 21,526	$ 12,039
Investment in subsidiary banks	315,181	305,064
Investments in other subsidiaries	2,084	8,444
Other assets	5,499	6,393
Total assets	334,869	350,370
Subordinated debentures	46,393	51,548
Other liabilities	1,847	2,724
Common stock and related accounts	286,629	296,098
Total liabilities & shareholders' equity	$ 334,869	$ 350,370

Parent Company Condensed Fin103

Parent Company Condensed Financial Information (Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Noninterest income	$ 16,085	$ 14,457	$ 18,931
Subordinated debentures	2,350	2,284	2,233
Noninterest expenses	63,246	58,240	56,912
Total income (loss) before taxes and equity in undistributed income of subsidiaries	27,513	27,200	33,647
Taxes on income (loss)	9,809	9,793	12,617
Net income	17,704	17,407	21,030
Parent Company [Member]
Cash dividends from subsidiaries	10,052	20,046	18,045
Noninterest income	25	45	34
Investment income		20	1,337
Other operating income	15	25	3
Security gains		163
Total income	10,092	20,299	19,419
Subordinated debentures	1,740	1,566	1,505
Noninterest expenses	2,191	1,756	1,317
Total expense	3,931	3,322	2,822
Total income (loss) before taxes and equity in undistributed income of subsidiaries	6,161	16,977	16,597
Taxes on income (loss)	(1,377)	(1,167)	(582)
Income (loss) before equity in undistributed income of subsidiaries	7,538	18,144	17,179
Equity in undistributed income (loss) of subsidiaries	10,166	(737)	3,851
Net income	$ 17,704	$ 17,407	$ 21,030

Parent Company Condensed Fin104

Parent Company Condensed Financial Information (Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 17,704	$ 17,407	$ 21,030
Net cash provided by operating activities	26,981	14,932	26,703
Payments to Acquire Available-for-sale Securities	159,542	115,710	51,344
Purchases of available for sale securities	(159,542)	(115,710)	(51,344)
Net cash used in investing activities	(131,535)	(194,433)	(231,795)
Net proceeds from issuance of common stock	1,239	682	385
Purchases of treasury stock	(22,721)	(8,624)	(10,302)
Common stock dividends paid	(6,088)	(4,607)	(3,131)
Net cash provided by financing activities	102,075	116,694	66,189
Net decrease in cash and cash equivalents	(2,479)	(62,807)	(138,903)
Beginning of period	78,129	140,936	279,839
End of period	75,650	78,129	140,936
Parent Company [Member]
Net income	17,704	17,407	21,030
Equity in undistributed (income) loss of subsidiaries	(10,166)	737	(3,851)
Other, net	6,823	2,295	2,937
Net cash provided by operating activities	14,361	20,439	20,116
Payments to Acquire Available-for-sale Securities			1,121
Purchases of available for sale securities			(1,121)
Sales/Maturities of available for sale securities		750	2,540
Proceeds from Sale and Maturity of Available-for-sale Securities		750	2,540
Outlays For Business Acquisitions		(4,697)
Other, net		(155)
Net cash used in investing activities		(4,102)	1,419
Net proceeds from issuance of common stock	1,239	682	1,386
Purchases of treasury stock	(22,721)	(8,624)	(10,302)
Common stock dividends paid	(6,088)	(4,607)	(3,132)
Other, net	(5,155)	5,155
Net cash provided by financing activities	(32,725)	(7,394)	(12,048)
Net decrease in cash and cash equivalents	(18,364)	8,943	9,487
Beginning of period	30,469	21,526	12,039
End of period	$ 12,105	$ 30,469	$ 21,526

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Mar. 18, 2011	Dec. 31, 2016
Loss Contingency, Information about Litigation Matters [Abstract]
Loan Balance of Swap Commitment		$ 14,700
Loss Contingency, Lawsuit Filing Date	March 18, 2011
Interest rate swap agreement Notional amount		$ 34,700