Southwest Bancorp (OKSB) 10-Q 7 Aug 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 07, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	SOUTHWEST BANCORP INC
Entity Central Index Key	914,374
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Trading Symbol	oksb
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,685,050

Consolidated Statements Of Fina

Consolidated Statements Of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and due from banks	$ 37,898	$ 36,831
Interest-bearing deposits	41,941	38,819
Cash and cash equivalents	79,839	75,650
Securities held to maturity (fair values of $10,632 and $10,677, respectively)	10,382	10,443
Securities available for sale (amortized cost of $424,172 and $427,113, respectively)	424,031	426,218
Loans held for sale	6,036	4,386
Loans receivable	1,965,598	1,872,746
Less: Allowance for loan losses	(27,318)	(27,546)
Net loans receivable	1,938,280	1,845,200
Accrued interest receivable	6,328	6,194
Non-hedge derivative asset	2,698	1,235
Premises and equipment, net	21,901	22,808
Other real estate		350
Goodwill	13,545	13,545
Other intangible assets, net	5,727	5,790
Bank owned life insurance	28,450	28,575
Other assets	35,718	34,998
Total assets	2,572,935	2,475,392
Deposits:
Noninterest-bearing demand	557,159	551,709
Interest-bearing demand	176,724	152,656
Money market accounts	599,122	567,058
Savings accounts	57,905	56,410
Time deposits of $100,000 or more	403,918	360,307
Other time deposits	219,006	257,878
Total deposits	2,013,834	1,946,018
Accrued interest payable	1,259	1,132
Non-hedge derivative liability	2,698	1,235
Other liabilities	9,500	10,171
Other borrowings	203,705	183,814
Subordinated debentures	46,393	46,393
Total liabilities	2,277,389	2,188,763
Shareholders' equity:
Common stock - $1 par value; 40,000,000 shares authorized; 21,260,352 and 21,230,714 shares issued, respectively	21,260	21,231
Additional paid in capital	123,772	123,112
Retained earnings	192,961	184,840
Accumulated other comprehensive loss	(292)	(907)
Treasury stock, at cost; 2,574,079 and 2,555,987 shares, respectively	(42,155)	(41,647)
Total shareholders' equity	295,546	286,629
Total liabilities & shareholders' equity	$ 2,572,935	$ 2,475,392

Consolidated Statements Of Fin3

Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Consolidated Statements Of Financial Condition [Abstract]
Held to maturity securities, fair value	$ 10,632	$ 10,677
Available for sale securities, amortized cost	$ 424,172	$ 427,113
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,260,352	21,230,714
Treasury Stock, Shares	2,574,079	2,555,987

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Interest and fees on loans	$ 22,562	$ 20,031	$ 43,506	$ 40,061
Investment securities:
U.S. government and agency obligations	270	302	539	598
Mortgage-backed securities	1,084	1,038	2,207	2,115
State and political subdivisions	339	350	678	698
Other securities	342	272	663	516
Other interest-earning assets	111	51	186	104
Total interest income	24,708	22,044	47,779	44,092
Interest expense:
Interest-bearing demand	90	65	180	127
Money market accounts	815	329	1,287	650
Savings accounts	19	18	38	37
Time deposits of $100,000 or more	514	448	1,324	815
Other time deposits	686	568	1,135	1,106
Other borrowings	610	342	1,088	651
Subordinated debentures	604	579	1,194	1,171
Total interest expense	3,338	2,349	6,246	4,557
Net interest income	21,370	19,695	41,533	39,535
Provision for loan losses	1,729	10	3,505	4,385
Net interest income after provision for loan losses	19,641	19,685	38,028	35,150
Noninterest income:
Service charges and fees	2,800	2,556	5,481	5,105
Gain on sales of mortgage loans, net	695	722	1,247	1,123
Gain on sales/calls of investment securities, net		165	451	291
Other noninterest income	1,026	428	2,222	767
Total noninterest income	4,521	3,871	9,401	7,286
Noninterest expense:
Salaries and employee benefits	9,675	9,587	19,575	18,929
Occupancy	2,318	2,669	4,691	5,340
Data processing	459	430	868	900
FDIC and other insurance	273	432	546	800
Other real estate, net	50	8	53	21
Provision (credit) for unfunded loan commitments	30	(263)	(358)	(48)
General and administrative	2,350	2,405	5,083	5,322
Total noninterest expense	15,155	15,268	30,458	31,264
Income before taxes	9,007	8,288	16,971	11,172
Taxes on income	3,189	2,876	5,874	3,891
Net income	$ 5,818	$ 5,412	$ 11,097	$ 7,281
Basic earnings per common share	$ 0.31	$ 0.29	$ 0.59	$ 0.38
Diluted earnings per common share	0.31	0.28	0.59	0.38
Common dividends declared per share	$ 0.08	$ 0.08	$ 0.16	$ 0.16

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 5,818	$ 5,412	$ 11,097	$ 7,281
Other comprehensive income:
Unrealized holding gain (loss) on available for sale securities	(109)	1,693	754	4,804
Reclassification adjustment for net gains arising during the period		(165)		(291)
Change in fair value of derivative used for cash flow hedge	128	95	285	211
Other comprehensive income, before tax	19	1,623	1,039	4,724
Tax expense related to items of other comprehensive income	(9)	(666)	(424)	(1,931)
Other comprehensive income, net of tax	10	957	615	2,793
Comprehensive income	$ 5,828	$ 6,369	$ 11,712	$ 10,074

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 11,097	$ 7,281
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,505	4,385
Deferred tax expense	824	39
Asset depreciation	1,210	1,436
Securities premium amortization, net of discount accretion	1,895	1,539
Amortization of intangibles	425	1,193
Restricted stock amortization expense	353	448
Net gain on sales/calls of investment securities	(451)	(291)
Net gain on sales of mortgage loans	(1,247)	(1,123)
Net loss on sales of premises/equipment	7	7
Net loss on sales of other real estate	23	5
Proceeds from sales of held for sale loans	56,690	56,253
Held for sale loans originated for resale	(57,335)	(54,682)
Net changes in assets and liabilities:
Accrued interest receivable	(134)	37
Bank owned life insurance	125	(455)
Other assets	(1,143)	(5,396)
Accrued interest payable	127	64
Other liabilities	1,427	2,924
Net cash provided by operating activities	17,398	13,664
Investing activities:
Proceeds from sales of available for sale securities		41,530
Available for sale securities	43,476	33,828
Purchases of held to maturity securities		(444)
Purchases of available for sale securities	(42,370)	(81,817)
Net purchases of FHLB stock	(2,551)	(2,733)
Loans originated, net of principal repayments	(96,711)	(46,059)
Purchases of premises and equipment	(334)	(639)
Proceeds from sales of premises and equipment	24	44
Proceeds from sales of other real estate	337	147
Net cash used in investing activities	(98,129)	(56,143)
Financing activities:
Net increase in deposits	67,816	18,760
Net increase in other borrowings	19,891	42,641
Net proceeds from issuance of common stock	689	413
Purchases of treasury stock	(508)	(21,107)
Redemption of trust preferred securities		(5,155)
Common stock dividends paid	(2,967)	(3,113)
Preferred stock dividends paid	(1)	(1)
Net cash provided by financing activities	84,920	32,438
Net increase (decrease) in cash and cash equivalents	4,189	(10,041)
Cash and cash equivalents:
Beginning of period	75,650	78,129
End of period	$ 79,839	$ 68,088

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 Income Gain/(Loss) [Member]	Treasury Stock [Member]	Total
Beginning balance, Shares at Dec. 31, 2015	20,006,802
Beginning balance at Dec. 31, 2015	$ 21,138	$ 121,966	$ 173,210	$ (1,290)	$ (18,926)	$ 296,098
Dividends declared:
Preferred			(1)			(1)
Common			(3,117)			(3,117)
Net common stock issued under employee plans and related tax expense	$ 86	327				413
Net common stock issued under employee plans and related tax expense, shares	85,585
Other comprehensive income, net of tax				2,793		2,793
Treasury shares purchased					(21,107)	(21,107)
Treasury shares purchased, shares	(1,341,604)
Net income			7,281			7,281
Ending balance, Shares at Jun. 30, 2016	18,750,783
Ending balance at Jun. 30, 2016	$ 21,224	122,293	177,373	1,503	(40,033)	282,360
Beginning balance, Shares at Dec. 31, 2016	18,674,727
Beginning balance at Dec. 31, 2016	$ 21,231	123,112	184,840	(907)	(41,647)	286,629
Dividends declared:
Preferred			(1)			(1)
Common			(2,975)			(2,975)
Net common stock issued under employee plans and related tax expense	$ 29	660				689
Net common stock issued under employee plans and related tax expense, shares	29,638
Other comprehensive income, net of tax				615		615
Treasury shares purchased					(508)	(508)
Treasury shares purchased, shares	(18,092)
Net income			11,097			11,097
Ending balance, Shares at Jun. 30, 2017	18,686,273
Ending balance at Jun. 30, 2017	$ 21,260	$ 123,772	$ 192,961	$ (292)	$ (42,155)	$ 295,546

Consolidated Statement of Shar8

Consolidated Statement of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statement Of Shareholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.08	$ 0.08	$ 0.16	$ 0.16

Summary of Significant Accounti

Summary of Significant Accounting And Reporting Policies	6 Months Ended
	Jun. 30, 2017
Significant Accounting And Reporting Policies [Abstract]
Significant Accounting And Reporting Policies	N OTE 1 : SIGNIFICANT ACCOUNTING AND REPORTING POLICIES  The accompanying unaudited consolidated financial statements were prepared in accordance with instructions for Form 10-Q and, therefore, do not include all information and notes necessary for a complete presentation of financial position, results of operations, shareholders’ equity, cash flows, and comprehensive income in conformity with accounting principles generally accepted in the United States. However, the unaudited consolidated financial statements include all adjustments which, in the opinion of management, are necessary for a fair presentation. Those adjustments consist of normal recurring adjustments. The results of operations for the three and six months ended June 30, 2017, and the cash flows for the six months ended June 30, 2017 , should not be considered indicative of the results to be expected for the full year. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Southwest Bancorp, Inc. Annual Report on Form 10-K for the year ended December 31, 201 6 .  The accompanying unaudited consolidated financial statements include the accounts of Southwest Bancorp, Inc. ( “we”, “our”, “us”, “Southwest”), and our consolidated subsidiaries, including Bank SNB, an Oklahoma state banking corporation (“Bank SNB”), our banking subsidiary, and the consolidated subsidiaries of Bank SNB. All significant intercompany transactions and balances have been eliminated in consolidation.  In accordance with Accounting Standards Codification (“ASC”) 855, Subsequent Events , we have evaluated subsequent events for potential recognition and disclosure through the date the consolidated financial statements included in this Quarterly Report on Form 10-Q were issued.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2017
Investment Securities [Abstract]
Investment Securities	 NOTE 2 : INVESTMENT SECURITIES  A summary of the amortized cost and fair values of investme nt securities at June 30, 2017 and December 31, 2016 follows:    Amortized Gross Unrealized Fair  (Dollars in thousands) Cost Gains Losses Value  At June 30, 2017  Held to Maturity:  Obligations of state and political subdivisions $ 10,382 $ 252 $ (2) $ 10,632  Total $ 10,382 $ 252 $ (2) $ 10,632   Available for Sale:  Federal agency securities $ 64,502 $ 353 $ (63) $ 64,792  Obligations of state and political subdivisions 45,306 624 (74) 45,856  Residential mortgage-backed securities 285,835 411 (1,771) 284,475  Asset-backed securities 8,511 18 (32) 8,497  Corporate debt 20,018 450 (57) 20,411  Total $ 424,172 $ 1,856 $ (1,997) $ 424,031   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  Residential mortgage-backed securities consist of agency securities underwritten and guaranteed by Government National Mortgage Association, Federal Home Loan Mortgage Corporation, and Federal National Mortgage Association. Other securities consist of corporate stock.  Securities with limited marketa bility, such as Federal Reserve Bank stock, Federal Home Loan Bank (“FHLB”) stock, and certain other investments, are carried at cost and included in other assets on the consolidated statement s of financial condition. Total investments carried at cost were $ 17.1 million at June 30, 2017 and $14.6 million at December 31, 2016 . 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 June 30, 2017 follows:    Available for Sale Held to Maturity  Amortized Fair Amortized Fair  (Dollars in thousands) Cost Value Cost Value  One year or less $ 26,829 $ 26,854 $ 371 $ 370  More than one year through five years 265,468 265,416 8,878 9,105  More than five years through ten years 103,256 102,849 1,133 1,157  More than ten years 28,619 28,912 - -  Total $ 424,172 $ 424,031 $ 10,382 $ 10,632  The foregoing analysis assumes that our residential mortgage-backed securities mature during the period in which they are estimated to be prepaid and are based on expected mat urities. Expected maturities differ from contractual maturities because borrowers of the underlying mortgages may have the right to call or prepay obligations with or without prepayment penalties. 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 specifi c identification method. The table below shows the proceeds, gross realized gains and gross realized losses recognized on the investment portfolio for the three and six months ended June 30, 2017 and June 30, 2016. Proceeds from sales recognized during t he six months ended June 30, 2017 resulted from the sale of a private equity investment carri ed at cost and recorded in other assets. Proceeds from the s ales during the three and six months ended June 30, 2016 resulted from a slight restructuring of our investment portfolio.     For the three months For the six months  ended June 30, ended June 30,  (Dollars in thousands) 2017 2016 2017 2016  Proceeds from sales $ - $ 18,726 $ 601 $ 41,530  Gross realized gains - 173 451 345  Gross realized losses - (8) - (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 June 30, 2017 and December 31, 2016 . 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 June 30, 2017  Held to Maturity:  Obligations of state and political subdivisions 5 $ 442 $ (1) $ (1) $ 440  5 $ 442 $ (1) $ (1) $ 440   Available for Sale:  Federal agency securities 11 $ 27,667 $ (42) $ (21) $ 27,604  Obligations of state and political subdivisions 11 8,343 (22) (52) 8,269  Residential mortgage-backed securities 101 236,213 (1,356) (415) 234,442  Asset-backed securities 1 3,958 - (32) 3,926  Corporate debt 2 5,007 - (57) 4,950  Total 126 $ 281,188 $ (1,420) $ (577) $ 279,191   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  Corporate debt 2 5,005 - (72) 4,933  Total 143 $ 293,273 $ (1,874) $ (641) $ 290,758  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 our intent and ability to retain our investment in the issuer for a period of time sufficient to allow for an anticipated recovery in fair value. We have the ability and intent to hold the securities classified as held to maturity until they mature, at which time we expect to receive full value for the securities. Furthermor e, as of June 30, 2017 , management does not have the intent to sell any of the securities classified as available for sale in the table above and believes that it is not likely that we will have to sell any such securities before a recovery of cost. The declines in fair value were attributable to recent 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 June 30, 2017 , 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, and borrowings from the FHLB. Securities with an amortized cost of $ 215.3 million and $ 199.0 million were pledged to meet such requirements at June 30, 2017 and December 31, 2016 , respectively. Any amount over-pledged can be released at any time.

Loans And Allowance For Loan Lo

Loans And Allowance For Loan Losses	6 Months Ended
	Jun. 30, 2017
Loans And Allowance For Loan Losses [Abstract]
Loans And Allowance For Loan Losses	NOTE 3 : LOANS AND ALLOWANCE FOR LOAN LOSSES We extend commercial and consumer credit primarily to customers in the states of Oklahom a, Texas, Kansas, and Colorado. Our commercial lending operations are concentrated in Oklahoma City, Tulsa, Dallas, San Antonio, Wichita, and other metropolitan markets in Oklahoma, Texas , Kansas, and Colorado . As a result, the collect a bility of our loan portfolio can be affected by changes in the economic conditions in those states and markets . Please see “Note 9: Operating Segments” in the Notes to Unaudited Consolidated Financial Statements for more detail regarding loans by market. At June 30, 2017 and December 31, 2016 , substantially all of our l oans 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 June 30, 2017 At December 31, 2016  Real estate mortgage:  Commercial $ 961,085 $ 882,071  One-to-four family residential 241,140 199,123  Real estate construction:  Commercial 182,620 199,113  One-to-four family residential 14,523 20,946  Commercial 554,094 556,248  Installment and consumer 18,172 19,631  1,971,634 1,877,132  Less: Allowance for loan losses (27,318) (27,546)  Total loans, net 1,944,316 1,849,586  Less: Loans held for sale (included above) (6,036) (4,386)  Net loans receivable $ 1,938,280 $ 1,845,200  Concentrations of Cred it . At June 30, 2017 , $662.6 million, or 34% , and $ 429.5 million, or 22 %, o f our loan s consisted of loans to individuals and businesses in the real estate and healthca re 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 held for sale of $ 6.0 million and $ 4.4 million at June 30, 2017 and December 31, 2016 , 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 our one-to-four family residential loans and loan servicing rights are sold to one buyer. 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. These loans are available for sale in the secondary market. 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 others totaled $ 463.8 million and $ 460.6 million at June 30, 2017 and December 31, 2016 , 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. Acquired Loan s . On October 9, 2015, we completed the acquisition of First Commercial Bancshares (“Bancshares”) by merging Bancshares with and into us (the “Merger”). In connection with the Merger, First Commercial Bank was merged with and into Bank SNB, with Bank SNB being the surviving bank. We evaluated $200.0 million of the loans purchased in conjunction with the merger 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 million 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 purchased credit impaired loans will recognize interest income through accretion of the difference between the carrying amount of the loans and the expected cash flows.      Changes in the carrying amounts and accretable yields for the ACS 310-30 loans that were acquired were as follows for the three and six months ended June 30, 2017 and June 30, 2016 :    For the three months ended June 30,  2017 2016  Carrying Carrying  Accretable amount Accretable amount  (Dollars in thousands) Yield of loans Yield of loans  Balance at beginning of period $ 487 $ 3,817 $ 742 $ 7,288  Payments received - (572) - (286)  Net charge-offs (2) (623) (11) (196)  Accretion (9) 896 (48) -  Balance at end of period $ 476 $ 3,518 $ 683 $ 6,806      For the six months ended June 30,  2017 2016  Carrying Carrying  Accretable amount Accretable amount  (Dollars in thousands) Yield of loans Yield of loans  Balance at beginning of period $ 630 $ 4,632 $ 807 $ 7,914  Payments received - (1,387) - (790)  Net charge-offs (2) (623) (11) (318)  Accretion (152) 896 (113) -  Balance at end of period $ 476 $ 3,518 $ 683 $ 6,806  Nonperforming / Past Due Loans . We identify past due loans based on contractual terms on a loan-by-loan basis and generally place loans, except for consumer loans, on nonaccrual when any portion of the principal or intere st is ninety d ays past due and collateral is insufficient to discharge the debt in full. Interest accrual may also be discontinued earlier if, in management’s opinion, collection is unlikely. Generally, past due consumer installment loans are not placed on nonaccrual but are charged-off when they are four months past due. Accrued interest is written off when a loan is placed on nonaccrual status. Subsequent interest income is recorded when cash receipts are received from the borrower and collectability of the principal amount is reasonably assured. Under generally accepted accounting principles and instructions to reports of condition and income of banking regulators, a nonaccrual loan may be returned to accrual status: (i) when none of its principal and interest is due and unpaid, repayment is expected, and there has been a sustained period (at least six months) of repayment performance; (ii) when the loan is well-secured, there is a sustained period of performance and repayment within a reasonable period is reasonably assured; or (iii) when the loan otherwise becomes well-secured and in the process of collection. Loans that have been restructured because of weakened financial positions of the borrowers also may be returned to accrual status if repayment is reasonably assured under the revised terms and there has been a sustained period of repayment performance. 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 to us t hat have not been identified as nonperformi ng or potential problem loans. Because the loan portfolio contains a significant number of commercial (including energy banking credits) and commercial real estate loans with relatively large balances , the unexpected deterioration of one or a few 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.  The following table shows the recorded investment in loans on nonaccrual status:      (Dollars in thousands) At June 30, 2017 At December 31, 2016  Real estate mortgage:  Commercial $ 6,694 $ 6,471  One-to-four family residential 2,752 2,766  Real estate construction:  Commercial 132 522  One-to-four family residential 447 448  Commercial 12,883 5,949  Other consumer 21 111  Total nonaccrual loans $ 22,929 $ 16,267  During the first six months of 2017 , $0.2 million of interest income was received on nonaccruing loans . If interest on all nonaccrual loans had been accrued for the six months ended June 30, 2017 , additional interest income of $ 0.5 million would have been recorded.  The following table shows an age analysis of past due loans at June 30, 2017 and December 31, 2016: December 31, 2016    90 days + Recorded loans  30-89 days past due and Total past Total > 90 days and  (Dollars in thousands) past due nonaccrual due Current loans accruing  At June 30, 2017  Real estate mortgage:  Commercial $ 285 $ 6,694 $ 6,979 $ 954,106 $ 961,085 $ -  One-to-four family residential 1,192 2,797 3,989 237,151 241,140 45  Real estate construction:  Commercial - 132 132 182,488 182,620 -  One-to-four family residential - 447 447 14,076 14,523 -  Commercial 498 12,884 13,382 540,712 554,094 1  Other 134 106 240 17,932 18,172 85  Total $ 2,109 $ 23,060 $ 25,169 $ 1,946,465 $ 1,971,634 $ 131   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   Impaired Loans . 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. Each loan deemed to be impaired (loans on nonaccrual status and greater than $100,000, and all troubled debt restructurings) is evaluated on an individual basis using the discounted present value of expected cash flows based on the loan’s initial effective interest rate, the fair value of collateral, or the market value of the loan. Smaller balance and homogeneous loans, including mortgage and consumer loans, are collectively evaluated for impairment. Interest payments on impaired loans are applied to principal until collectability of the principal amount is reasonably assured, and, at that time, interest is recognized on a cash basis. Impaired loans, or portions thereof, are charged-off when deemed uncollectible.  Impaired loans as of June 30, 2017 and December 31, 2016 are shown in the following table:     With No Specific Allowance With A Specific Allowance  Unpaid Unpaid  Recorded Principal Recorded Principal Related  (Dollars in thousands) Investment Balance Investment Balance Allowance  At June 30, 2017  Commercial real estate $ 7,789 $ 8,473 $ - $ - $ -  One-to-four family residential 2,769 3,162 - - -  Real estate construction 579 781 - - -  Commercial 477 1,450 12,408 16,034 2,461  Other 21 26 - - -  Total $ 11,635 $ 13,892 $ 12,408 $ 16,034 $ 2,461   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   The average recorded investment of loans classified as impaired and the interest income recognized on those loans for the six months ended June 30, 2017 and June 30, 2016 are shown in the following table:     As of and for the six months ended June 30,  2017 2016  Average Average  Recorded Interest Recorded Interest  (Dollars in thousands) Investment Income Investment Income  Commercial real estate $ 3,430 $ 97 $ 17,365 $ 871  One-to-four family residential 3,183 34 3,627 12  Real estate construction 651 - 1,408 -  Commercial 9,342 94 13,274 32  Other 26 - 77 -  Total $ 16,632 $ 225 $ 35,751 $ 915  Troubled Debt Restructurings. Our loan portfolio also includes certain lo ans that have been modified in troubled debt restructuring s , 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 are then further 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 modify loans in a troubled debt restructuring, an evaluation of any possible impairment is performed similar to the evaluation done with respect 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. Troubled debt restructured loans outstanding as of June 30, 2017 and December 31, 2016 were as follows:     At June 30, 2017 At December 31, 2016  (Dollars in thousands) Accruing Nonaccrual Accruing Nonaccrual  Commercial real estate $ 1,095 $ 107 $ 1,118 $ 475  One-to-four family residential 17 - 15 46  Commercial 2 7,335 45 3,323  Total $ 1,114 $ 7,442 $ 1,178 $ 3,844  At June 30, 2017 and December 31, 2016, we had no significant commitments to lend additional funds to debtors whose loan terms had been modified in a troubled debt restructuring.  There were three commercial loans modified as troubled debt restructurings that occurred during the three months ended June 30, 2017 and none for the three months ended June 30, 2016. There were three commercial loans modified as troubled debt restructurings that occurred during the six months ended June 30, 2017 and one commercial loan modified as a troubled debt restructuring for the six months ended June 30, 2016. Loans modified as troubled debt restructurings that occurred during the three and six months ended June 30, 2017 and June 30, 2016 are shown in the following table:     For the three months ended June 30,  2017 2016  Number of Recorded Number of Recorded  (Dollars in thousands) Modifications Investment Modifications Investment  Commercial 3 $ 4,174 - $ -  Total 3 $ 4,174 - $ -   For the six months ended June 30,  2017 2016  Number of Recorded Number of Recorded  (Dollars in thousands) Modifications Investment Modifications Investment  Commercial 3 $ 4,174 1 $ 26  Total 3 $ 4,174 1 $ 26  The modifications of loans identified as troubled debt restructurings primarily related to payment reductions, payment extensions, and/or reductions in the interest rate. The financial impact of troubled debt restructurings is not significant. There were no loans modified as a troubled debt restructuring that subsequently defaulted during the three or six months ended June 30, 2017 or June 30, 2016 . Default, for this purpose, is deemed to occur when a loan is 90 days o r 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 June 30, 2017 and December 31, 2016, based on the most recent analysis performed as of those dates, the risk category of loans by class was as follows:     Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At June 30, 2017  Grade:  Pass $ 919,620 $ 235,040 $ 185,916 $ 502,838 $ 18,151 $ 1,861,565  Special Mention 25,711 2,154 10,059 20,522 - 58,446  Substandard 15,754 3,946 1,168 29,730 21 50,619  Doubtful - - - 1,004 - 1,004  Total $ 961,085 $ 241,140 $ 197,143 $ 554,094 $ 18,172 $ 1,971,634   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  Allowance for Loan Losses . The allowance for loan losses is a reserve established through the 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 periodic review and evaluation of the loan portfolio and quarterly assessments of the probable losses inherent in the loan portfolio . The amount of the loan loss provision for a period is based solely upon the amount needed to cause the allowance to reach the level deemed appropriate after the effects of net charge-offs for the period. Management believes the level of the allowance is appropriate to absorb 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. There is no one factor, or group of factors, that produces the amount of an appropriate allowance for loan losses, as the methodology for assessing the allowance for loan losses makes use of evaluations of individual impaired loans along with other factors and analysis of loan categories. This assessment is highly qualitative and relies upon judgments and estimates by management. The specific allowance is recorded based on the result of an evaluation consistent with ASC 310.10.35, Receivables: Subsequent Measurement , for each impaired loan. Collateral dependent loans are evaluated for impairment based upon the fair value of the collateral. 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 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. Charge-offs against the allowance for impaired loans are made when and to the extent loans are deemed uncollectible. Any portion of a collateral dependent impaired loan in excess of the fair value of the collateral that is determined to be uncollectible is charged off. 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 . Commercial real estate pools are further segmented by market type for non-owner occupied and owner occupied collateral. Our primary markets are Oklahoma, Texas, Kansas, and Colorado. 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 following discovery of factors that may significantly affect the value of the collateral. Appraisals typically are received within 30 days of request. Results of appraisals on nonperforming and potential problem loans are reviewed promptly upon receipt 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. The following tables show the balance in the allowance for loan losses and the recorded investment in loans for the dates indicated by 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 June 30, 2017  Balance at beginning of fiscal year $ 12,507 $ 1,163 $ 3,502 $ 10,058 $ 316 $ 27,546  Loans charged-off (2,029) (3) - (2,165) (201) (4,398)  Recoveries 216 75 5 317 52 665  Provision for loan losses 1,632 136 (566) 2,193 110 3,505  Balance at end of period $ 12,326 $ 1,371 $ 2,941 $ 10,403 $ 277 $ 27,318   Allowance for loan losses ending balance:  Individually evaluated for impairment $ - $ - $ - $ 2,461 $ - $ 2,461  Collectively evaluated for impairment 12,326 1,371 2,941 7,942 277 24,857  Acquired with deteriorated credit quality - - - - - -  Total ending allowance balance $ 12,326 $ 1,371 $ 2,941 $ 10,403 $ 277 $ 27,318   Loans receivable ending balance:  Individually evaluated for impairment $ 7,011 $ 1,871 $ - $ 12,408 $ - $ 21,290  Collectively evaluated for impairment 952,524 238,120 196,514 541,496 18,172 1,946,826  Acquired with deteriorated credit quality 1,550 1,149 629 190 - 3,518  Total ending loans balance $ 961,085 $ 241,140 $ 197,143 $ 554,094 $ 18,172 $ 1,971,634    Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At June 30, 2016  Balance at beginning of fiscal year $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106  Loans charged-off (3) (83) - (3,801) (376) (4,263)  Recoveries 234 54 - 311 49 648  Provision for loan losses (2,234) 362 647 5,194 416 4,385  Balance at end of period $ 10,713 $ 1,033 $ 3,180 $ 11,669 $ 281 $ 26,876   Allowance for loan losses ending balances:  Individually evaluated for impairment $ 281 $ 116 $ - $ 2,915 $ - $ 3,312  Collectively evaluated for impairment 9,961 917 3,140 8,754 281 23,053  Acquired with deteriorated credit quality 471 - 40 - - 511  Total ending allowance balance $ 10,713 $ 1,033 $ 3,180 $ 11,669 $ 281 $ 26,876   Loans receivable ending balance:  Individually evaluated for impairment $ 13,192 $ 2,187 $ 754 $ 13,880 $ 38 $ 30,051  Collectively evaluated for impairment 844,739 180,213 194,646 544,221 20,702 1,784,521  Acquired with deteriorated credit quality 4,356 1,293 752 371 33 6,805  Total ending loans balance $ 862,287 $ 183,693 $ 196,152 $ 558,472 $ 20,773 $ 1,821,377  

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Measurements [Abstract]
Fair Value Measurements	NOTE 4: 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 and Disclosure , 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 determined 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 our estimated fair value amounts. There were no significant changes in valuation methods used to estimate fair value during the six months ended June 30, 2017. 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. 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 our independent pricing service, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. Derivative instruments – 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. We also offer 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 and collateral requirements. The fair value of the interest rate swap agreements are obtained from dealer quotes.  The following table summarizes financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016:     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 June 30, 2017  Available for sale securities:  Federal agency securities $ 64,792 $ - $ 64,792 $ -  Obligations of state and political subdivisions 45,856 - 45,856 -  Residential mortgage-backed securities 284,475 - 284,475 -  Asset-backed securities 8,497 - 8,497 -  Corporate debt 20,411 231 20,180 -   Derivative asset 2,698 - 2,698 -  Derivative liability (3,068) - (3,068) -  Total $ 423,661 $ 231 $ 423,430 $ -   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 $ -  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). These 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 inputs based on third-party appraisals. Certain other impaired loans are analyzed and reported through a specific valuation allowance 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 significant properties less the estimated costs to sell the asset. Mortgage loan servicing rights – 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 cha nges in market conditio ns. Core deposit premiums – T he fair value of core deposit premiums are based on third-party appraisals. Goodwill – Fair value of goodwill is based on the fair value of each of our reporting units to which goodwill is allocated compared with th eir respective carrying value.   Assets that were measured at fair value on a nonrecurring basis as of June 30, 2017 and December 31, 2016 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 June 30, 2017  Impaired loans at fair value :  Commercial 12,408 - - 12,408   Loans held for sale:  One-to-four family residential 6,036 - 6,036 -  Total $ 18,444 $ - $ 6,036 $ 12,408   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 For the six months ended June 30, 2017, i mpaired loans measured at fair value with a carryi ng amount of $ 15.9 million were written down to a fair value of $ 12.4 million, resulting in a life-to-date impairment of $ 3.5 m illion. For the year ended December 31, 2016 , 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 at December 31, 2016 , resulting in a life-to-date impairment charge of $ 6.5 million . No i mpairment was recognized for other real estate during the six months ended June 30, 2017 or the year ended December 31, 2016.  As of June 30, 2017, mortgage servicing rights had a fair value of $4.4 million, which exceeded the book value of $3.7 million. Because the fair value exceeded the book value, there was no impairment charge at June 30, 2017. As of December 31, 2016, the mortgage 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.  No impairment of core deposit premiums or goodwill was recognized during the six months ended June 30, 2017 or the year ended December 31, 2016.  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. Investments 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 maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. A ccrued interest payable and other liabilities – The estimated fair value of accrued interest payable and other liabilities, which primarily includes trade accounts payable, approximates their carrying values. Other borrowings – Included in other borrowings are FHLB advances and securities sold under 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 – Our two subordinated debentures have floating rates that reset quarterly. The fair value of the floating rate subordinated debentures approximates carrying value at June 30, 2017. 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 were as follow s :     At June 30, 2017 At December 31, 2016  Carrying Fair Carrying Fair  (Dollars in thousands) Values Values Values Values  Financial assets:  Level 2 inputs:  Cash and cash equivalents $ 79,839 $ 79,839 $ 75,650 $ 75,650  Securities held to maturity 10,382 10,632 10,443 10,677  Accrued interest receivable 6,328 6,328 6,194 6,194  Mortgage loan servicing rights 3,666 4,404 3,491 4,159  Bank-owned life insurance 28,450 28,450 28,575 28,575  Investments included in other assets 17,079 17,079 14,627 14,627  Level 3 inputs:  Total loans, net of allowance 1,944,316 1,934,986 1,849,586 1,839,960  Financial liabilities:  Level 2 inputs:  Deposits 2,013,834 1,967,298 1,946,018 1,897,927  Accrued interest payable 1,259 1,259 1,132 1,132  Other liabilities 9,130 9,130 9,516 9,516  Other borrowings 203,705 203,793 183,814 183,926  Subordinated debentures 46,393 46,393 46,393 46,393 

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments [Abstract]
Derivative Instruments	NOTE 5: DERIVATIVE INSTRUMENTS  We utilize derivatives instruments to manage exposure to various types of interest rate risk for us and our customers within our policy guidelines. All derivative instruments are carried at fair value and 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 committee. Our credit exposure on interest rate swaps is limited to the net favorable value and interest payments of all swaps with each counterparty. Access to collateral in the event of default is reasonably assured. Therefore, c redit 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 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, except for a fixed pricing spread or fee paid to us by the dealer counterparty and the collateral requirements. These interest rate swaps carry varying degrees of credit, interest rate and market or liquidity risks. The fair value of derivative instruments is recognized as either assets or liabilities in the consolidated statements of financial condition.  We have entered into seventeen customer interest rate swap agreements that effectively convert the loan interest rate from floating rate based on LIBOR or prime rate to a fixed rate for the customer. As of June 30, 2017, these loans had an outstanding balance of $180.6 million. We have entered into offsetting agreement s 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 condition:     As of June 30, 2017 At December 31, 2016  (Dollars in thousands) Notional Fair Value Notional Fair Value  Non-hedge derivative assets $ 180,631 $ 2,698 $ 123,953 $ 1,235  Non-hedge derivative liabilities 180,631 2,698 123,953 1,235  The margin rates to us in connection with these instruments are a contractual percentage over the one-month LIBOR or a minimal percentage under the prime rate. 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 June 30, 2017, we had posted $1.5 million in collateral with our dealer counterparties. These interest rate swaps are not designated as hedging instruments.  Interest Rate Swap  We have an interest rate swap agreement with a total notional amount of $ 25.0 million. The interest rate swap agreement was designated as a hedging instrument in cash flow hedges 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 London Interbank Offered Rate (“LIBOR”). Under the swap agreement, we 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 June 30, 2017 was 4.01 %. The estimated fair value of the interest rate swap contract outstanding as of June 30, 2017 and December 31, 2016 resulted in a pre-tax loss of $ 0.4 million and $ 0.7 million, respectively, and was included in other liabilities in the consolidated statements of financial condition. We obtained the counterparty valuation to validate the interest rate derivative contract as of June 30, 2017 and December 31, 2016 . The effective portion of our gain or loss due to changes in the fair value of the interest rate swap contract, a $ 0.2 million loss and a $0.1 million loss for the six months ended June 30, 2017 and June 30, 2016 , 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 outflows as a result of the interest rate swap contract were $ 0.3 million for both the six months ended June 30, 2017 and June 30, 2016 and were included in interest expense on subordinated debentures. We posted cash collateral with our counterparty related to the interest rate swap contract in excess of the required $0.5 million and $0.7 million at June 30, 2017 and December 31, 2016, respectively .  There are no credit-risk-related contingent features associated with our derivative contract.

Taxes On Income

Taxes On Income	6 Months Ended
	Jun. 30, 2017
Taxes On Income [Abstract]
Taxes On Income	 NOTE 6: TAXES ON INCOME  Net deferred tax as sets totaled $ 11.9 million at June 30, 2017 and $ 13.2 million at December 31, 2016 . Net deferred tax assets are included in other assets and no valuation allowance is considered necessary. We or one of our subsidiaries file 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.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2017
Shareholders' Equity [Abstract]
Shareholders' Equity	 NOTE 7: SHAREHOLDERS’ EQUITY  Sto ck 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 outstanding common stock and became effective February 23, 2017, which was the original expiration date of the third program. During the first six months of 2017, we have made no repurchases. 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 of $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 our planned merger with Simmons First National Corporation is pending.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	 NOTE 8: EARNINGS PER SHARE  Earnings per common share is computed using the two-class method prescribed by ASC 260, Earnings Per Share . Using the two-class method, basic earnings per common share is computed based upon net income divided by the weighted average number of common shares outstanding during each period, which excludes outstand ing 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 stock compensation using the treasury stock method. The following table shows the computation of basic and diluted earnings per common share:     For the three months For the six months  ended June 30, ended June 30,  (Dollars in thousands, except earnings per share data) 2017 2016 2017 2016  Numerator:  Net income $ 5,818 $ 5,412 $ 11,097 $ 7,281  Earnings allocated to participating securities (104) (110) (193) (131)  Numerator for earnings per common share $ 5,714 $ 5,302 $ 10,904 $ 7,150   Denominator:  Denominator for basic earnings per common share 18,354,631 18,574,300 18,362,549 18,916,686  Dilutive effect of stock compensation 138,108 102,261 136,485 18,918  Denominator for diluted earnings per common share 18,492,739 18,676,561 18,499,034 18,935,604  Earnings per common share:  Basic $ 0.31 $ 0.29 $ 0.59 $ 0.38  Diluted $ 0.31 $ 0.28 $ 0.59 $ 0.38 

Operating Segments

Operating Segments	6 Months Ended
	Jun. 30, 2017
Operating Segments [Abstract]
Operating Segments	NOTE 9: OPERATING SEGMENTS We operate four principal segments: Oklahoma Banking, Texas Banking, Kansas Banking, and Other Operations. The Oklahoma Banking segment provides deposit and l ending services, including residential mortgage lending services to customers. Due to its size and our management structure, our Colorado banking operations are included within the Oklahoma Banking segment. The Texas Banking segment and the Kansas Banking segment provide deposit and lending services. Other Operations includes our funds management unit and corporate investments.  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. The following table summarizes financial results by operating segment:     For the three months ended June 30, 2017  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations Company  Net interest income $ 13,349 $ 6,197 $ 1,614 $ 210 $ 21,370  Provision (credit) for loan losses 1,424 354 (52) 3 1,729  Noninterest income 3,146 466 290 619 4,521  Noninterest expenses 9,735 3,219 1,314 887 15,155  Income (loss) before taxes 5,336 3,090 642 (61) 9,007  Taxes on income (loss) 1,892 1,095 227 (25) 3,189  Net income (loss) $ 3,444 $ 1,995 $ 415 $ (36) $ 5,818      For the six months ended June 30, 2017  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company  Net interest income (loss) $ 26,143 $ 12,285 $ 3,172 $ (67) $ 41,533  Provision (credit) for loan losses 2,846 845 (186) - 3,505  Noninterest income 6,406 922 592 1,481 9,401  Noninterest expenses 19,432 6,416 2,721 1,889 30,458  Income (loss) before taxes 10,271 5,946 1,229 (475) 16,971  Taxes on income (loss) 3,555 2,058 425 (164) 5,874  Net income (loss) $ 6,716 $ 3,888 $ 804 $ (311) $ 11,097   * Includes externally generated revenue of $2.3 million, primarily from investing services, and an internally generated loss of $0.9 million from the funds management unit.   Total loans at period end $ 1,193,108 $ 636,709 $ 141,817 $ - $ 1,971,634  Total assets at period end 1,228,506 632,773 140,702 570,954 2,572,935  Total deposits at period end 1,369,810 196,390 156,383 291,251 2,013,834      For the three months ended June 30, 2016  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations Company  Net interest income $ 12,339 $ 5,640 $ 1,638 $ 78 $ 19,695  Provision (credit) for loan losses (210) 330 (113) 3 10  Noninterest income 2,657 290 300 624 3,871  Noninterest expenses 9,879 3,256 1,347 786 15,268  Income (loss) before taxes 5,327 2,344 704 (87) 8,288  Taxes on income (loss) 1,837 816 250 (27) 2,876  Net income (loss) $ 3,490 $ 1,528 $ 454 $ (60) $ 5,412      For the six months ended June 30, 2016  Oklahoma Texas Kansas Other Total  (Dollars in thousands) Banking Banking Banking Operations* Company  Net interest income (loss) $ 25,277 $ 11,206 $ 3,466 $ (414) $ 39,535  Provision for loan losses 50 2,245 2,086 4 4,385  Noninterest income 4,852 592 618 1,224 7,286  Noninterest expenses 19,839 6,987 2,764 1,674 31,264  Income (loss) before taxes 10,240 2,566 (766) (868) 11,172  Taxes on income (loss) 3,566 894 (267) (302) 3,891  Net income (loss) $ 6,674 $ 1,672 $ (499) $ (566) $ 7,281   * Includes externally generated revenue of $1.9 million, primarily from investing services, and an internally generated loss of $1.0 million from the funds management unit.   Total loans at period end $ 1,085,986 $ 577,333 $ 158,058 $ - $ 1,821,377  Total assets at period end 1,130,161 573,199 157,054 541,848 2,402,262  Total deposits at period end 1,322,430 190,475 135,585 254,375 1,902,865  

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies [Abstract]
Commitments and contingencies	NOTE 10 : COMMITMENTS 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.  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.  As of June 30, 2017 and December 31, 2016, our loan commitments were $429.3 million and $429.4 million, respectively. As of June 30, 2017 and December 31, 2016, our standby letters of credit obligations were $6.1 million and $7.2 million, respectively.      Customer Ris k 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 a floating rate based on LIBOR to a fixed rate for the customer. As of June 30, 2017 , the floating rate loan had an outstanding balance of $ 14.2 million. The option to execute the swap is conditional on the borrower’s 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.  As of June 30, 2017 and December 31, 2016, we had eight risk participation agreements an d seven risk participation agreements, respectively, 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 June 30, 2017 and December 31, 2016, the current notional amount for these transactions were $51.6 million and $34.7 million, respectively.  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. Plaintiff s 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 to vigorously defend the action. On March 26, 2014, the Court denied the plaintiffs’ request to certify the class; however, the Court permitted the plaintiff s 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 respec t to plaintiffs’ usury claims. Plaintiffs thereafter filed a motion seeking leave to amend their complaint to add addition al 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 specifically 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 t he 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) whether a class will ultimately be certified, (iii) the particular class members, (iv) the interest rate on loans made by Bank SNB charged to particular class members, (v) the late fees charged to particular class members, (vi) the time period that will ultimately be at issue if a class is certified in the Ubaldi Case, (vii) the theories, if any, under which the plaintiffs might prevail, (viii) whether Sallie Mae will make a claim against us for indemnification or repurchase, and (ix) 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.  Pending Merger Update  We previously announced a definitive agreement and plan of merger with and into Simmons First National Corporation (NASDAQ-GS: SFNC). The merger application for this transaction was filed on July 14, 2017. Conversion and integration plans are in process. Subject to regulatory approval and the satisfaction of other closing conditions, we anticipate a closing date as early as October 2017 or as late as January 2018.

New Authoritative Accounting Gu

New Authoritative Accounting Guidance	6 Months Ended
	Jun. 30, 2017
New Authoritative Accounting Guidance [Abstract]
New Authoritative Accounting Guidance	NOTE 11: NEW AUTHORITATIVE ACCOUNTING GUIDANCE  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 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 740): 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 2017, the FASB issued Accounting Standards Update (“ASU”) 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The main objective of this new standard is to help financial statement preparers evaluate whether a set of transferred assets and activities (either acquired or disposed of) is a business. Accounting for a business combination differs significantly from that of an asset acquisition. Because the definition of a business affects acquisitions, disposals, goodwill, and consolidation, the revised definition of a business is generally expected to reduce the number of transactions that qualify as a business combination. This guidance requires an entity to evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. The set is not a business if this screen is met. If this screen is not met, however, the entity then evaluates whether the set meets the requirement that a business include, at a minimum, 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 we are evaluating the impact of this ASU on our financial statements and disclosures.  In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment . The new guidance will simplify financial reporting because it eliminates the need to determine the fair value of individual assets and liabilities of a reporting unit to measure the goodwill impairment. This ASU simplifies how all entities assess goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Entities will still perform their annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. If the fair value exceeds the carrying amount, no impairment should be recorded. If a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charged based on that difference. Impairment losses on goodwill cannot be reversed once recognized. This guidance becomes effective for us on January 1, 2020, and we are evaluating the impact of this ASU on our financial statements and disclosures.  In February 2017, the FASB issued ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets . This ASU primarily defines in-substance nonfinancial assets and provides guidance for partial sales of nonfinancial assets. It also eliminates rules specifically addressing sales of real estate, removes exceptions to the financial asset derecognition model, and clarifies the accounting for contributions of nonfinancial assets to joint ventures. This guidance becomes effective for us on January 1, 2019, and we are evaluating the impact of this ASU on our financial statements and disclosures.  In March 2017, the FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities , which is intended to enhance the accounting for the amortization of premiums for purchased callable debt securities. This ASU amends the amortization period for certain callable debt securities held at a premium by more closely aligning the amortization period of premiums and discounts to expectations incorporated in market pricing on the underlying securities. Previously, the premiums on callable debt securities generally were required to be amortized based on the maturity date. Under this update, the premiums on certain callable debt securities held at a premium are to be amortized based on the earliest call date. This update is effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. The Company has elected to early adopt this update effective January 1, 2017, which did not have a material impact on our financial statements and disclosures.  In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU provides relief to entities that make non-substantive changes to their share-based payment awards. It provides guidance that will allow companies to make certain changes to awards without applying modification accounting. Under the new guidance, an entity will not apply modification accounting to a share-based payment award if the award’s fair value, vesting conditions, and classification as an equity or liability instrument are the same immediately before and after the change. This guidance becomes effective for us on January 1, 2018, and we are evaluating the impact of this ASU on our financial statements and disclosures.

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017  Held to Maturity:  Obligations of state and political subdivisions $ 10,382 $ 252 $ (2) $ 10,632  Total $ 10,382 $ 252 $ (2) $ 10,632   Available for Sale:  Federal agency securities $ 64,502 $ 353 $ (63) $ 64,792  Obligations of state and political subdivisions 45,306 624 (74) 45,856  Residential mortgage-backed securities 285,835 411 (1,771) 284,475  Asset-backed securities 8,511 18 (32) 8,497  Corporate debt 20,018 450 (57) 20,411  Total $ 424,172 $ 1,856 $ (1,997) $ 424,031   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 
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 $ 26,829 $ 26,854 $ 371 $ 370  More than one year through five years 265,468 265,416 8,878 9,105  More than five years through ten years 103,256 102,849 1,133 1,157  More than ten years 28,619 28,912 - -  Total $ 424,172 $ 424,031 $ 10,382 $ 10,632 
Summary Of Sales Of Available For Sale Securities	  For the three months For the six months  ended June 30, ended June 30,  (Dollars in thousands) 2017 2016 2017 2016  Proceeds from sales $ - $ 18,726 $ 601 $ 41,530  Gross realized gains - 173 451 345  Gross realized losses - (8) - (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 June 30, 2017  Held to Maturity:  Obligations of state and political subdivisions 5 $ 442 $ (1) $ (1) $ 440  5 $ 442 $ (1) $ (1) $ 440   Available for Sale:  Federal agency securities 11 $ 27,667 $ (42) $ (21) $ 27,604  Obligations of state and political subdivisions 11 8,343 (22) (52) 8,269  Residential mortgage-backed securities 101 236,213 (1,356) (415) 234,442  Asset-backed securities 1 3,958 - (32) 3,926  Corporate debt 2 5,007 - (57) 4,950  Total 126 $ 281,188 $ (1,420) $ (577) $ 279,191   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  Corporate debt 2 5,005 - (72) 4,933  Total 143 $ 293,273 $ (1,874) $ (641) $ 290,758 

Loans And Allowance For Loan 21

Loans And Allowance For Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2017
Loans And Allowance For Loan Losses [Abstract]
Southwest's Loan Classifications	    (Dollars in thousands) At June 30, 2017 At December 31, 2016  Real estate mortgage:  Commercial $ 961,085 $ 882,071  One-to-four family residential 241,140 199,123  Real estate construction:  Commercial 182,620 199,113  One-to-four family residential 14,523 20,946  Commercial 554,094 556,248  Installment and consumer 18,172 19,631  1,971,634 1,877,132  Less: Allowance for loan losses (27,318) (27,546)  Total loans, net 1,944,316 1,849,586  Less: Loans held for sale (included above) (6,036) (4,386)  Net loans receivable $ 1,938,280 $ 1,845,200 
Changes In The Carrying Amounts And Accretable Yields For ASC 310.30 Loans	   For the three months ended June 30,  2017 2016  Carrying Carrying  Accretable amount Accretable amount  (Dollars in thousands) Yield of loans Yield of loans  Balance at beginning of period $ 487 $ 3,817 $ 742 $ 7,288  Payments received - (572) - (286)  Net charge-offs (2) (623) (11) (196)  Accretion (9) 896 (48) -  Balance at end of period $ 476 $ 3,518 $ 683 $ 6,806      For the six months ended June 30,  2017 2016  Carrying Carrying  Accretable amount Accretable amount  (Dollars in thousands) Yield of loans Yield of loans  Balance at beginning of period $ 630 $ 4,632 $ 807 $ 7,914  Payments received - (1,387) - (790)  Net charge-offs (2) (623) (11) (318)  Accretion (152) 896 (113) -  Balance at end of period $ 476 $ 3,518 $ 683 $ 6,806 
Recorded Investment In Loans On Nonaccrual Status	    (Dollars in thousands) At June 30, 2017 At December 31, 2016  Real estate mortgage:  Commercial $ 6,694 $ 6,471  One-to-four family residential 2,752 2,766  Real estate construction:  Commercial 132 522  One-to-four family residential 447 448  Commercial 12,883 5,949  Other consumer 21 111  Total nonaccrual loans $ 22,929 $ 16,267 
Age Analysis Of Past Due Loans	   90 days + Recorded loans  30-89 days past due and Total past Total > 90 days and  (Dollars in thousands) past due nonaccrual due Current loans accruing  At June 30, 2017  Real estate mortgage:  Commercial $ 285 $ 6,694 $ 6,979 $ 954,106 $ 961,085 $ -  One-to-four family residential 1,192 2,797 3,989 237,151 241,140 45  Real estate construction:  Commercial - 132 132 182,488 182,620 -  One-to-four family residential - 447 447 14,076 14,523 -  Commercial 498 12,884 13,382 540,712 554,094 1  Other 134 106 240 17,932 18,172 85  Total $ 2,109 $ 23,060 $ 25,169 $ 1,946,465 $ 1,971,634 $ 131   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  
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 June 30, 2017  Commercial real estate $ 7,789 $ 8,473 $ - $ - $ -  One-to-four family residential 2,769 3,162 - - -  Real estate construction 579 781 - - -  Commercial 477 1,450 12,408 16,034 2,461  Other 21 26 - - -  Total $ 11,635 $ 13,892 $ 12,408 $ 16,034 $ 2,461   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  
Average Recorded Investment And Interest Income Recognized On Impaired Loans	   As of and for the six months ended June 30,  2017 2016  Average Average  Recorded Interest Recorded Interest  (Dollars in thousands) Investment Income Investment Income  Commercial real estate $ 3,430 $ 97 $ 17,365 $ 871  One-to-four family residential 3,183 34 3,627 12  Real estate construction 651 - 1,408 -  Commercial 9,342 94 13,274 32  Other 26 - 77 -  Total $ 16,632 $ 225 $ 35,751 $ 915 
Troubled Debt Restructured Loans Outstanding	   At June 30, 2017 At December 31, 2016  (Dollars in thousands) Accruing Nonaccrual Accruing Nonaccrual  Commercial real estate $ 1,095 $ 107 $ 1,118 $ 475  One-to-four family residential 17 - 15 46  Commercial 2 7,335 45 3,323  Total $ 1,114 $ 7,442 $ 1,178 $ 3,844 
Loans Modified As Troubled Debt Restructurings	    For the three months ended June 30,  2017 2016  Number of Recorded Number of Recorded  (Dollars in thousands) Modifications Investment Modifications Investment  Commercial 3 $ 4,174 - $ -  Total 3 $ 4,174 - $ -   For the six months ended June 30,  2017 2016  Number of Recorded Number of Recorded  (Dollars in thousands) Modifications Investment Modifications Investment  Commercial 3 $ 4,174 1 $ 26  Total 3 $ 4,174 1 $ 26 
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 June 30, 2017  Grade:  Pass $ 919,620 $ 235,040 $ 185,916 $ 502,838 $ 18,151 $ 1,861,565  Special Mention 25,711 2,154 10,059 20,522 - 58,446  Substandard 15,754 3,946 1,168 29,730 21 50,619  Doubtful - - - 1,004 - 1,004  Total $ 961,085 $ 241,140 $ 197,143 $ 554,094 $ 18,172 $ 1,971,634   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 
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 June 30, 2017  Balance at beginning of fiscal year $ 12,507 $ 1,163 $ 3,502 $ 10,058 $ 316 $ 27,546  Loans charged-off (2,029) (3) - (2,165) (201) (4,398)  Recoveries 216 75 5 317 52 665  Provision for loan losses 1,632 136 (566) 2,193 110 3,505  Balance at end of period $ 12,326 $ 1,371 $ 2,941 $ 10,403 $ 277 $ 27,318   Allowance for loan losses ending balance:  Individually evaluated for impairment $ - $ - $ - $ 2,461 $ - $ 2,461  Collectively evaluated for impairment 12,326 1,371 2,941 7,942 277 24,857  Acquired with deteriorated credit quality - - - - - -  Total ending allowance balance $ 12,326 $ 1,371 $ 2,941 $ 10,403 $ 277 $ 27,318   Loans receivable ending balance:  Individually evaluated for impairment $ 7,011 $ 1,871 $ - $ 12,408 $ - $ 21,290  Collectively evaluated for impairment 952,524 238,120 196,514 541,496 18,172 1,946,826  Acquired with deteriorated credit quality 1,550 1,149 629 190 - 3,518  Total ending loans balance $ 961,085 $ 241,140 $ 197,143 $ 554,094 $ 18,172 $ 1,971,634    Commercial 1-4 Family Real Estate  (Dollars in thousands) Real Estate Residential Construction Commercial Other Total  At June 30, 2016  Balance at beginning of fiscal year $ 12,716 $ 700 $ 2,533 $ 9,965 $ 192 $ 26,106  Loans charged-off (3) (83) - (3,801) (376) (4,263)  Recoveries 234 54 - 311 49 648  Provision for loan losses (2,234) 362 647 5,194 416 4,385  Balance at end of period $ 10,713 $ 1,033 $ 3,180 $ 11,669 $ 281 $ 26,876   Allowance for loan losses ending balances:  Individually evaluated for impairment $ 281 $ 116 $ - $ 2,915 $ - $ 3,312  Collectively evaluated for impairment 9,961 917 3,140 8,754 281 23,053  Acquired with deteriorated credit quality 471 - 40 - - 511  Total ending allowance balance $ 10,713 $ 1,033 $ 3,180 $ 11,669 $ 281 $ 26,876   Loans receivable ending balance:  Individually evaluated for impairment $ 13,192 $ 2,187 $ 754 $ 13,880 $ 38 $ 30,051  Collectively evaluated for impairment 844,739 180,213 194,646 544,221 20,702 1,784,521  Acquired with deteriorated credit quality 4,356 1,293 752 371 33 6,805  Total ending loans balance $ 862,287 $ 183,693 $ 196,152 $ 558,472 $ 20,773 $ 1,821,377 

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017  Available for sale securities:  Federal agency securities $ 64,792 $ - $ 64,792 $ -  Obligations of state and political subdivisions 45,856 - 45,856 -  Residential mortgage-backed securities 284,475 - 284,475 -  Asset-backed securities 8,497 - 8,497 -  Corporate debt 20,411 231 20,180 -   Derivative asset 2,698 - 2,698 -  Derivative liability (3,068) - (3,068) -  Total $ 423,661 $ 231 $ 423,430 $ -   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 $ - 
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 June 30, 2017  Impaired loans at fair value :  Commercial 12,408 - - 12,408   Loans held for sale:  One-to-four family residential 6,036 - 6,036 -  Total $ 18,444 $ - $ 6,036 $ 12,408   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 
Carrying Values And Estimated Fair Values Of Financial Instruments Segregated By The Level Of The Valuation Inputs	   At June 30, 2017 At December 31, 2016  Carrying Fair Carrying Fair  (Dollars in thousands) Values Values Values Values  Financial assets:  Level 2 inputs:  Cash and cash equivalents $ 79,839 $ 79,839 $ 75,650 $ 75,650  Securities held to maturity 10,382 10,632 10,443 10,677  Accrued interest receivable 6,328 6,328 6,194 6,194  Mortgage loan servicing rights 3,666 4,404 3,491 4,159  Bank-owned life insurance 28,450 28,450 28,575 28,575  Investments included in other assets 17,079 17,079 14,627 14,627  Level 3 inputs:  Total loans, net of allowance 1,944,316 1,934,986 1,849,586 1,839,960  Financial liabilities:  Level 2 inputs:  Deposits 2,013,834 1,967,298 1,946,018 1,897,927  Accrued interest payable 1,259 1,259 1,132 1,132  Other liabilities 9,130 9,130 9,516 9,516  Other borrowings 203,705 203,793 183,814 183,926  Subordinated debentures 46,393 46,393 46,393 46,393 

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments [Abstract]
Non-Hedge Derivative Assets and Liabilities	  As of June 30, 2017 At December 31, 2016  (Dollars in thousands) Notional Fair Value Notional Fair Value  Non-hedge derivative assets $ 180,631 $ 2,698 $ 123,953 $ 1,235  Non-hedge derivative liabilities 180,631 2,698 123,953 1,235 

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Computation Of Basic And Diluted Earnings Per Common Share	   For the three months For the six months  ended June 30, ended June 30,  (Dollars in thousands, except earnings per share data) 2017 2016 2017 2016  Numerator:  Net income $ 5,818 $ 5,412 $ 11,097 $ 7,281  Earnings allocated to participating securities (104) (110) (193) (131)  Numerator for earnings per common share $ 5,714 $ 5,302 $ 10,904 $ 7,150   Denominator:  Denominator for basic earnings per common share 18,354,631 18,574,300 18,362,549 18,916,686  Dilutive effect of stock compensation 138,108 102,261 136,485 18,918  Denominator for diluted earnings per common share 18,492,739 18,676,561 18,499,034 18,935,604  Earnings per common share:  Basic $ 0.31 $ 0.29 $ 0.59 $ 0.38  Diluted $ 0.31 $ 0.28 $ 0.59 $ 0.38 

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investment Securities [Abstract]
Total investments carried at cost	$ 17.1	$ 14.6
Available for sale debt securities amortized cost pledged as collateral	$ 215.3	$ 199

Investment Securities (Summary

Investment Securities (Summary Of Amortized Cost And Fair Values Of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Held to Maturity	$ 10,382	$ 10,443
Gross Unrealized Gains, Held-to-maturity	252	242
Gross Unrealized Losses, Held to Maturity	(2)	(8)
Fair Value, Held to Maturity	10,632	10,677
Amortized Cost, Available for Sale	424,172	427,113
Gross Unrealized Gains, Available for Sale	1,856	1,620
Gross Unrealized Losses, Available for Sale	(1,997)	(2,515)
Available-for-sale Securities	424,031	426,218
Federal Agency Securities [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	64,502	69,691
Gross Unrealized Gains, Available for Sale	353	201
Gross Unrealized Losses, Available for Sale	(63)	(198)
Available-for-sale Securities	64,792	69,694
Obligations Of State And Political Subdivisions [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Held to Maturity	10,382	10,443
Gross Unrealized Gains, Held-to-maturity	252	242
Gross Unrealized Losses, Held to Maturity	(2)	(8)
Fair Value, Held to Maturity	10,632	10,677
Amortized Cost, Available for Sale	45,306	46,105
Gross Unrealized Gains, Available for Sale	624	461
Gross Unrealized Losses, Available for Sale	(74)	(191)
Available-for-sale Securities	45,856	46,375
Residential Mortgage-Backed Securities [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	285,835	282,035
Gross Unrealized Gains, Available for Sale	411	573
Gross Unrealized Losses, Available for Sale	(1,771)	(1,966)
Available-for-sale Securities	284,475	280,642
Asset-Backed Securities [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	8,511	9,265
Gross Unrealized Gains, Available for Sale	18
Gross Unrealized Losses, Available for Sale	(32)	(88)
Available-for-sale Securities	8,497	9,177
Corporate Debt [Member]
Held To Maturity Securities And Available For Sale Securities [Line Items]
Amortized Cost, Available for Sale	20,018	20,017
Gross Unrealized Gains, Available for Sale	450	385
Gross Unrealized Losses, Available for Sale	(57)	(72)
Available-for-sale Securities	$ 20,411	$ 20,330

Investment Securities (Amortize

Investment Securities (Amortized Cost And Approximate Fair Value Of Investment Securities By Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Amortized cost and approximate fair value [Abstract]
One year or less, Amortized cost, Available for Sale	$ 26,829
One year or less, Fair Value, Available for Sale	26,854
One year or less, Amortized Cost, Held to Maturity	371
One year or less, Fair Value, Held to Maturity	370
More than one year through five years, Amortized Cost, Available for Sale	265,468
More than one year through five years, Fair Value, Available for Sale	265,416
More than one year through five years, Amortized Cost, Held to Maturity	8,878
More than one year through five years, Fair Value, Held to Maturity	9,105
More than five years through ten years, Amortized Cost, Available for Sale	103,256
More than five years through ten years, Fair Value, Available for Sale	102,849
More than five years through ten years, Amortized Cost, Held to Maturity	1,133
More than five years through ten years, Fair Value, Held to Maturity	1,157
More than ten years, Amortized Cost, Available for Sale	28,619
More than ten years, Fair Value, Available for Sale	28,912
Total, Amortized Cost, Available for Sale	424,172
Total, Fair Value, Available for Sale	424,031
Held-to-maturity Securities, Total	10,382	$ 10,443
Fair Value, Held to Maturity	$ 10,632	$ 10,677

Investment Securities (Summar28

Investment Securities (Summary Of Sales Of Available For Sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investment Securities [Abstract]
Proceeds from sales	$ 18,726	$ 601	$ 41,530
Gross realized gains	173	$ 451	345
Gross realized losses	$ (8)		$ (54)

Investment Securities (Summar29

Investment Securities (Summary Of Securities With Gross Unrealized Losses And Their Fair Values) (Details) $ in Thousands	Jun. 30, 2017USD ($)security	Dec. 31, 2016USD ($)security
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	126	143
Number of Securities, Held to Maturity | security	5	7
Amortized cost of securities with unrealized losses, Available for Sale	$ 281,188	$ 293,273
Amortized cost of securities with unrealized losses, Held to Maturity	442	1,987
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(1,420)	(1,874)
Continuous Unrealized Loss Existing for Less Than 12 Months, Held to Maturity	(1)	(8)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(577)	(641)
Continuous Unrealized Loss Existing for More Than 12 Months, Held to Maturity	(1)
Fair value of securities with unrealized losses, Available for Sale	279,191	290,758
Fair value of securities with unrealized losses, Held to Maturity	$ 440	$ 1,979
Federal Agency Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	11	13
Amortized cost of securities with unrealized losses, Available for Sale	$ 27,667	$ 34,734
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(42)	(111)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(21)	(87)
Fair value of securities with unrealized losses, Available for Sale	$ 27,604	$ 34,536
Obligations Of State And Political Subdivisions [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	11	36
Number of Securities, Held to Maturity | security	5	7
Amortized cost of securities with unrealized losses, Available for Sale	$ 8,343	$ 18,283
Amortized cost of securities with unrealized losses, Held to Maturity	442	1,987
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(22)	(145)
Continuous Unrealized Loss Existing for Less Than 12 Months, Held to Maturity	(1)	(8)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(52)	(46)
Continuous Unrealized Loss Existing for More Than 12 Months, Held to Maturity	(1)
Fair value of securities with unrealized losses, Available for Sale	8,269	18,092
Fair value of securities with unrealized losses, Held to Maturity	$ 440	$ 1,979
Residential Mortgage-Backed Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	101	89
Amortized cost of securities with unrealized losses, Available for Sale	$ 236,213	$ 225,986
Continuous Unrealized Loss Existing for Less Than 12 Months, Available for Sale	(1,356)	(1,618)
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(415)	(348)
Fair value of securities with unrealized losses, Available for Sale	$ 234,442	$ 224,020
Asset-Backed Securities [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	1	3
Amortized cost of securities with unrealized losses, Available for Sale	$ 3,958	$ 9,265
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(32)	(88)
Fair value of securities with unrealized losses, Available for Sale	$ 3,926	$ 9,177
Corporate Debt [Member]
Available-for-sale Securities and Held-to-maturity Securities
Number of Securities, Available for Sale | security	2	2
Amortized cost of securities with unrealized losses, Available for Sale	$ 5,007	$ 5,005
Continuous Unrealized Loss Existing for More Than 12 Months, Available for Sale	(57)	(72)
Fair value of securities with unrealized losses, Available for Sale	$ 4,950	$ 4,933

Loans And Allowance For Loan 30

Loans And Allowance For Loan Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Oct. 09, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 6	$ 6	$ 4.4
Actual loss period		3 years
Period to sell loans from the date of closing		1 month
Loans Purchased Evaluated in Conjunction With The Acquisition				$ 200
Loans Purchased Evaluated in Conjunction With The Acquisition, Discount				4.5
Loans, purchase credit impaired				7.8
Loans and debt securities acquired with deteriorated credit quality, discount				$ 3.3
Accrued additional interest income		$ 0.5
Interest And Fee Income Nonaccruing Loans		$ 0.2
Troubled debt restructuring default period		90 days
Troubled debt restructuring Period		12 months
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to individuals and businesses	$ 662.6
Percentage of loans to individuals and businesses	34.00%	34.00%
Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal of mortgage loans serviced for others	$ 463.8	$ 463.8	$ 460.6
Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans to individuals and businesses	$ 429.5
Percentage of loans to individuals and businesses	22.00%	22.00%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days for independent appraisals on real estate collateral		30 days

Loans And Allowance For Loan 31

Loans And Allowance For Loan Losses (Southwest's Loan Classifications) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 1,971,634	$ 1,877,132
Less: Allowance for loan losses	(27,318)	(27,546)
Total loans, net	1,944,316	1,849,586
Less: Loans held for sale (included above)	(6,036)	(4,386)
Net loans receivable	1,938,280	1,845,200
Real Estate Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	961,085	882,071
Real Estate Mortgage [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	241,140	199,123
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	554,094	556,248
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	182,620	199,113
Construction Loans [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	14,523	20,946
Installment And Consumer [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 18,172	$ 19,631

Loans And Allowance For Loan 32

Loans And Allowance For Loan Losses (Changes In Carryng Amounts And Accretable Yields) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loan And Allowance For Loans Losses [Abstract]
Balance at beginning of period, Accretable Yield	$ 487	$ 742	$ 630	$ 807
Net charge-offs, Accretable Yield	(2)	(11)	(2)	(11)
Accretion, Accretable yield	(9)	(48)	(152)	(113)
Balance at end of period, Accretable Yield	476	683	476	683
Balance at beginning of period, Carrying amount of loans	3,817	7,288	4,632	7,914
Payments received, Carrying amount of loans	(572)	(286)	(1,387)	(790)
Net charged-offs, Carrying amount of loans	(623)	(196)	(623)	(318)
Accretion, Carrying amount of loans	896		896
Balance at end of period, Carrying amount of loans	$ 3,518	$ 6,806	$ 3,518	$ 6,806

Loans And Allowance For Loan 33

Loans And Allowance For Loan Losses (Recorded Investment In Loans On Nonaccrual Status) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 22,929	$ 16,267
Commercial Real Estate Portfolio Segment [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	6,694	6,471
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	132	522
Residential Portfolio Segment [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	2,752	2,766
Real Estate Construction [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	447	448
Commercial Portfolio Segment [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	12,883	5,949
Consumer Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 21	$ 111

Loans And Allowance For Loan 34

Loans And Allowance For Loan Losses (Age Analysis Of Past Due Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 25,169	$ 20,154
Current	1,946,465	1,856,978
Loans receivable	1,971,634	1,877,132	$ 1,821,377
Recorded loans > 90 days and accruing	131	343
30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,109	3,544
90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	23,060	16,610
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	961,085	882,071
One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	241,140	199,123
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	197,143	220,059
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	554,094	556,248
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	961,085		862,287
Commercial Real Estate Portfolio Segment [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,979	6,496
Current	954,106	875,575
Loans receivable	961,085	882,071
Commercial Real Estate Portfolio Segment [Member] | Real Estate Mortgage [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	285	24
Commercial Real Estate Portfolio Segment [Member] | Real Estate Mortgage [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,694	6,472
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	132	522
Current	182,488	198,591
Loans receivable	182,620	199,113
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	132	522
Residential Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,989	3,534
Current	237,151	195,589
Loans receivable	241,140	199,123	183,693
Recorded loans > 90 days and accruing	45	138
Residential 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	1,192	631
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	2,797	2,903
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	447	448
Current	14,076	20,498
Loans receivable	14,523	20,946
Residential Portfolio Segment [Member] | Construction Loans [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	447	448
Real Estate Construction [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	197,143		196,152
Commercial Portfolio Segment [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	13,382	8,672
Current	540,712	547,576
Loans receivable	554,094	556,248	$ 558,472
Recorded loans > 90 days and accruing	1	193
Commercial Portfolio Segment [Member] | Commercial [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	498	2,530
Commercial Portfolio Segment [Member] | Commercial [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	12,884	6,142
Consumer Portfolio Segment [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	240	482
Current	17,932	19,149
Loans receivable	18,172	19,631
Recorded loans > 90 days and accruing	85	12
Consumer Portfolio Segment [Member] | Other [Member] | 30 Days To 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	134	359
Consumer Portfolio Segment [Member] | Other [Member] | 90 Days And Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 106	$ 123

Loans And Allowance For Loan 35

Loans And Allowance For Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	$ 11,635	$ 4,629
With No Specific Allowance Unpaid Principal Balance	13,892	8,494
With A Specific Allowance Recorded Investment	12,408	12,816
With A Specific Allowance Unpaid Principal Balance	16,034	15,952
With A Specific Allowance Related Allowance	2,461	3,668
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	7,789	1,536
With No Specific Allowance Unpaid Principal Balance	8,473	3,057
With A Specific Allowance Recorded Investment		6,053
With A Specific Allowance Unpaid Principal Balance		6,529
With A Specific Allowance Related Allowance		2,219
Residential Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	2,769	1,188
With No Specific Allowance Unpaid Principal Balance	3,162	1,535
With A Specific Allowance Recorded Investment		1,593
With A Specific Allowance Unpaid Principal Balance		1,698
With A Specific Allowance Related Allowance		63
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	579	762
With No Specific Allowance Unpaid Principal Balance	781	926
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] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	477	1,032
With No Specific Allowance Unpaid Principal Balance	1,450	2,861
With A Specific Allowance Recorded Investment	12,408	4,963
With A Specific Allowance Unpaid Principal Balance	16,034	7,480
With A Specific Allowance Related Allowance	2,461	1,346
Consumer Portfolio Segment [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
With No Specific Allowance Recorded Investment	21	111
With No Specific Allowance Unpaid Principal Balance	$ 26	$ 115

Loans And Allowance For Loan 36

Loans And Allowance For Loan Losses (Average Recorded Investment And Interest Income Recognized On Impaired Loans) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 16,632	$ 35,751
Interest Income	225	915
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,430	17,365
Interest Income	97	871
Residential Portfolio Segment [Member] | One-To-Four Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,183	3,627
Interest Income	34	12
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	651	1,408
Commercial Portfolio Segment [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	9,342	13,274
Interest Income	94	32
Consumer Portfolio Segment [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 26	$ 77

Loans And Allowance For Loan 37

Loans And Allowance For Loan Losses (Troubled Debt Restructured Loans Outstanding) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Accruing	$ 1,114	$ 1,178
Nonaccrual	7,442	3,844
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,095	1,118
Nonaccrual	107	475
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	17	15
Nonaccrual		46
Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	2	45
Nonaccrual	$ 7,335	$ 3,323

Loans And Allowance For Loan 38

Loans And Allowance For Loan Losses (Loans Modified As Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Modifications | loan	3	3	1
Recorded Investment | $	$ 4,174	$ 4,174	$ 26
Commercial Portfolio Segment [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | loan	3	3	1
Recorded Investment | $	$ 4,174	$ 4,174	$ 26

Loans And Allowance For Loan 39

Loans And Allowance For Loan Losses (Classification Of Risk Category Of Loans, By Classes) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 1,971,634	$ 1,877,132	$ 1,821,377
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,861,565	1,778,022
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	58,446	38,821
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	50,619	59,894
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,004	395
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	18,172	19,631	20,773
Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	18,151	19,518
Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21	113
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	961,085	882,071
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	919,620	857,290
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	25,711	4,479
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	15,754	20,302
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	961,085		862,287
One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	241,140	199,123
One-To-Four Family Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	235,040	192,395
One-To-Four Family Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	2,154	1,983
One-To-Four Family Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,946	4,745
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	241,140	199,123	183,693
Real Estate Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	961,085	882,071
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	197,143	220,059
Real Estate Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	185,916	210,780
Real Estate Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	10,059	7,720
Real Estate Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,168	1,559
Real Estate Construction [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	197,143		196,152
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	554,094	556,248
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	502,838	498,039
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	20,522	24,639
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	29,730	33,175
Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,004	395
Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	554,094	556,248	$ 558,472
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	182,620	199,113
Construction Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 14,523	$ 20,946

Loans And Allowance For Loan 40

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	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period			$ 27,546	$ 26,106
Loans charged-off			(4,398)	(4,263)
Recoveries			665	648
Provision for loan losses	$ 1,729	$ 10	3,505	4,385
Balance at end of period	27,318	26,876	27,318	26,876
Individually evaluated for impairment					$ 2,461		$ 3,312
Collectively evaluated for impairment					24,857		23,053
Acquired with deteriorated credit quality				511
Total ending allowance balance	27,318	26,876	27,546	26,106	27,318	$ 27,546	26,876
Individually evaluated for impairment					21,290		30,051
Collectively evaluated for impairment					1,946,826		1,784,521
Acquired With Deteriorated Credit Quality							6,805
Total ending loans balance					1,971,634	1,877,132	1,821,377
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Acquired With Deteriorated Credit Quality					3,518
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period			316	192
Loans charged-off			(201)	(376)
Recoveries			52	49
Provision for loan losses			110	416
Balance at end of period	277	281	277	281
Collectively evaluated for impairment					277		281
Total ending allowance balance	277	281	316	192	277	316	281
Individually evaluated for impairment							38
Collectively evaluated for impairment					18,172		20,702
Acquired With Deteriorated Credit Quality							33
Total ending loans balance					18,172	19,631	20,773
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					961,085	882,071
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period			12,507	12,716
Loans charged-off			(2,029)	(3)
Recoveries			216	234
Provision for loan losses			1,632	(2,234)
Balance at end of period	12,326	10,713	12,326	10,713
Individually evaluated for impairment							281
Collectively evaluated for impairment					12,326		9,961
Acquired with deteriorated credit quality				471
Total ending allowance balance	12,326	10,713	12,507	12,716	12,326	12,507	10,713
Individually evaluated for impairment					7,011		13,192
Collectively evaluated for impairment					952,524		844,739
Acquired With Deteriorated Credit Quality							4,356
Total ending loans balance					961,085		862,287
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Acquired With Deteriorated Credit Quality					1,550
One-To-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					241,140	199,123
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period			1,163	700
Loans charged-off			(3)	(83)
Recoveries			75	54
Provision for loan losses			136	362
Balance at end of period	1,371	1,033	1,371	1,033
Individually evaluated for impairment							116
Collectively evaluated for impairment					1,371		917
Total ending allowance balance	1,371	1,033	1,163	700	1,371	1,163	1,033
Individually evaluated for impairment					1,871		2,187
Collectively evaluated for impairment					238,120		180,213
Acquired With Deteriorated Credit Quality							1,293
Total ending loans balance					241,140	199,123	183,693
One-To-Four Family Residential [Member] | Residential Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Acquired With Deteriorated Credit Quality					1,149
Real Estate Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					961,085	882,071
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					182,620	199,113
Construction Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					14,523	20,946
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					554,094	556,248
Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period			10,058	9,965
Loans charged-off			(2,165)	(3,801)
Recoveries			317	311
Provision for loan losses			2,193	5,194
Balance at end of period	10,403	11,669	10,403	11,669
Individually evaluated for impairment					2,461		2,915
Collectively evaluated for impairment					7,942		8,754
Total ending allowance balance	10,403	11,669	10,058	9,965	10,403	10,058	11,669
Individually evaluated for impairment					12,408		13,880
Collectively evaluated for impairment					541,496		544,221
Acquired With Deteriorated Credit Quality							371
Total ending loans balance					554,094	556,248	558,472
Commercial [Member] | Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Acquired With Deteriorated Credit Quality					190
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loans balance					197,143	220,059
Real Estate Construction [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance at beginning of period			3,502	2,533
Recoveries			5
Provision for loan losses			(566)	647
Balance at end of period	2,941	3,180	2,941	3,180
Collectively evaluated for impairment					2,941		3,140
Acquired with deteriorated credit quality				40
Total ending allowance balance	$ 2,941	$ 3,180	$ 3,502	$ 2,533	2,941	$ 3,502	3,180
Individually evaluated for impairment							754
Collectively evaluated for impairment					196,514		194,646
Acquired With Deteriorated Credit Quality							752
Total ending loans balance					197,143		$ 196,152
Real Estate Construction [Member] | Real Estate Construction [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Acquired With Deteriorated Credit Quality					$ 629

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value Measurements [Abstract]
Impaired loans carrying amount	$ 15.9	$ 19.7
Impaired loans measured at fair value	12.4	13.2
Impaired loans life to date impairment	3.5	6.5
Servicing Asset at Fair Value, Amount	4.4	4.2
Servicing Asset at Amortized Cost	$ 3.7	$ 3.5

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 424,031	$ 426,218
Derivative asset	2,698	1,235
Derivative liability	(2,698)	(1,235)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,698	1,235
Total Assets at Fair Value on a recurring basis	423,661	425,563
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	64,792	69,694
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	45,856	46,375
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	284,475	280,642
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	8,497	9,177
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	20,411	20,330
Fair Value, Measurements, Recurring [Member] | Derivative Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	(3,068)	(1,890)
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	231	213
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	231	213
Fair Value, Measurements, Recurring [Member] | Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,698	1,235
Total Assets at Fair Value on a recurring basis	423,430	425,350
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	64,792	69,694
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	45,856	46,375
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	284,475	280,642
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	8,497	9,177
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	20,180	20,117
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	$ (3,068)	$ (1,890)

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	Jun. 30, 2017	Dec. 31, 2016
Noncovered impaired loans at fair value:
Assets fair value, Total	$ 18,444	$ 17,596
Commercial Real Estate [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		6,053
One-To-Four Family Residential [Member]
Noncovered impaired loans at fair value:
Loans held for sale	6,036	4,386
Assets fair value, Total		1,593
Real Estate Construction [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		207
Commercial [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	12,408	5,357
Level 2 Inputs [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	6,036	4,386
Level 2 Inputs [Member] | One-To-Four Family Residential [Member]
Noncovered impaired loans at fair value:
Loans held for sale	6,036	4,386
Level 3 Inputs [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	12,408	13,210
Level 3 Inputs [Member] | Commercial Real Estate [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		6,053
Level 3 Inputs [Member] | One-To-Four Family Residential [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		1,593
Level 3 Inputs [Member] | Real Estate Construction [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total		207
Level 3 Inputs [Member] | Commercial [Member]
Noncovered impaired loans at fair value:
Assets fair value, Total	$ 12,408	$ 5,357

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	Jun. 30, 2017	Dec. 31, 2016
Financial Assets:
Held to maturity securities, fair value	$ 10,632	$ 10,677
Accrued interest receivable	6,328	6,194
Servicing Asset at Amortized Cost	3,700	3,500
Mortgage loan servicing rights	4,400	4,200
Bank owned life insurance	28,450	28,575
Derivative Assets	2,698	1,235
Financial Liabilities:
Accrued interest payable	1,259	1,132
Derivative instrument	2,698	1,235
Other borrowings	203,705	183,814
Carrying Values [Member] | Level 2 Inputs [Member]
Financial Assets:
Cash and cash equivalents	79,839	75,650
Held to maturity securities, fair value	10,382	10,443
Accrued interest receivable	6,328	6,194
Mortgage loan servicing rights	3,666	3,491
Bank owned life insurance	28,450	28,575
Investments included in other assets	17,079	14,627
Financial Liabilities:
Deposits	2,013,834	1,946,018
Accrued interest payable	1,259	1,132
Other liabilities	9,130	9,516
Other borrowings	203,705	183,814
Subordinated debentures	46,393	46,393
Carrying Values [Member] | Level 3 Inputs [Member]
Financial Assets:
Total loans, net of allowance	1,944,316	1,849,586
Fair Values [Member] | Level 2 Inputs [Member]
Financial Assets:
Cash and cash equivalents	79,839	75,650
Held to maturity securities, fair value	10,632	10,677
Accrued interest receivable	6,328	6,194
Mortgage loan servicing rights	4,404	4,159
Bank owned life insurance	28,450	28,575
Investments included in other assets	17,079	14,627
Financial Liabilities:
Deposits	1,967,298	1,897,927
Accrued interest payable	1,259	1,132
Other liabilities	9,130	9,516
Other borrowings	203,793	183,926
Subordinated debentures	46,393	46,393
Fair Values [Member] | Level 3 Inputs [Member]
Financial Assets:
Total loans, net of allowance	$ 1,934,986	$ 1,839,960

Derivative Instruments (Details

Derivative Instruments (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)item	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Interest rate swap agreement Notional amount	$ 51,600		$ 34,700
Interest payment period	7 years
Fixed interest rate	6.15%
Rate received by Southwest	4.01%
Pretax loss related to derivative contracts	$ 400		700
Gain or loss due to changes in the fair value of the derivative hedging instrument	(200)	$ (100)
Net cash flows as a result of the interest rate swap agreement	300	$ 300
The fair value of cash and securities posted as collateral	500		700
Fair Value Net of Cash Collateral	1,500
Interest Rate Swap on Trust Preferred Securities [Member]
Derivative [Line Items]
Interest rate swap agreement Notional amount	$ 25,000
Variable interest rate	2.85%
Customer Risk Management Swaps [Member]
Derivative [Line Items]
Number of customer interest rate swap agreements | item	17
Interest rate swap agreement Notional amount	$ 180,600
Non-Hedge Derivative Asset [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	180,631		123,953
Non-hedge derivative asset, fair value	2,698		1,235
Non-Hedge Derivative Liability [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount	180,631		123,953
Non-hedge derivative liability, fair value	$ 2,698		$ 1,235

Taxes On Income (Details)

Taxes On Income (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Taxes On Income [Abstract]
Net deferred tax assets	$ 11.9	$ 13.2

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended	29 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2016	Feb. 23, 2017
Shareholders' Equity [Abstract]
Stock Repurchase Program Authorized Percent Of Common Stock				5.00%
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				921,000
Treasury Stock, Shares, Acquired	0	1,398,026	2,519,584
Treasury Stock, Amount, Acquired		$ 22.1	$ 40.8

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income	$ 5,818	$ 5,412	$ 11,097	$ 7,281
Earnings allocated to participating securities	(104)	(110)	(193)	(131)
Numerator for earnings per common share	$ 5,714	$ 5,302	$ 10,904	$ 7,150
Denominator:
Denominator for basic earnings per common share	18,354,631	18,574,300	18,362,549	18,916,686
Effect of dilutive securities:
Stock compensation	138,108	102,261	136,485	18,918
Denominator for diluted earnings per common share	18,492,739	18,676,561	18,499,034	18,935,604
Earnings per common share:
Basic	$ 0.31	$ 0.29	$ 0.59	$ 0.38
Diluted	$ 0.31	$ 0.28	$ 0.59	$ 0.38

Operating Segments (Narrative)

Operating Segments (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017segment
Operating Segments [Abstract]
Number of principal segments	4

Operating Segments (Financial R

Operating Segments (Financial Results By Operating Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financial results by operating segment
Net interest income (loss)	$ 21,370	$ 19,695	$ 41,533	$ 39,535
Provision for loan losses	1,729	10	3,505	4,385
Noninterest income	4,521	3,871	9,401	7,286
Noninterest expenses	15,155	15,268	30,458	31,264
Income before taxes	9,007	8,288	16,971	11,172
Taxes on income (loss)	3,189	2,876	5,874	3,891
Net income	5,818	5,412	11,097	7,281
Externally generated revenue from investing activities			2,300	1,900
Internally generated loss from fund management			900	1,000
Total loans at period end	1,971,634	1,821,377	1,971,634	1,821,377
Total assets at period end	2,572,935	2,402,262	2,572,935	2,402,262
Total deposits at period end	2,013,834	1,902,865	2,013,834	1,902,865
Oklahoma Banking [Member]
Financial results by operating segment
Net interest income (loss)	13,349	12,339	26,143	25,277
Provision for loan losses	1,424	(210)	2,846	50
Noninterest income	3,146	2,657	6,406	4,852
Noninterest expenses	9,735	9,879	19,432	19,839
Income before taxes	5,336	5,327	10,271	10,240
Taxes on income (loss)	1,892	1,837	3,555	3,566
Net income	3,444	3,490	6,716	6,674
Total loans at period end	1,193,108	1,085,986	1,193,108	1,085,986
Total assets at period end	1,228,506	1,130,161	1,228,506	1,130,161
Total deposits at period end	1,369,810	1,322,430	1,369,810	1,322,430
Texas Banking [Member]
Financial results by operating segment
Net interest income (loss)	6,197	5,640	12,285	11,206
Provision for loan losses	354	330	845	2,245
Noninterest income	466	290	922	592
Noninterest expenses	3,219	3,256	6,416	6,987
Income before taxes	3,090	2,344	5,946	2,566
Taxes on income (loss)	1,095	816	2,058	894
Net income	1,995	1,528	3,888	1,672
Total loans at period end	636,709	577,333	636,709	577,333
Total assets at period end	632,773	573,199	632,773	573,199
Total deposits at period end	196,390	190,475	196,390	190,475
Kansas Banking [Member]
Financial results by operating segment
Net interest income (loss)	1,614	1,638	3,172	3,466
Provision for loan losses	(52)	(113)	(186)	2,086
Noninterest income	290	300	592	618
Noninterest expenses	1,314	1,347	2,721	2,764
Income before taxes	642	704	1,229	(766)
Taxes on income (loss)	227	250	425	(267)
Net income	415	454	804	(499)
Total loans at period end	141,817	158,058	141,817	158,058
Total assets at period end	140,702	157,054	140,702	157,054
Total deposits at period end	156,383	135,585	156,383	135,585
Other Operations [Member]
Financial results by operating segment
Net interest income (loss)	210	78	(67)	(414)
Provision for loan losses	3	3		4
Noninterest income	619	624	1,481	1,224
Noninterest expenses	887	786	1,889	1,674
Income before taxes	(61)	(87)	(475)	(868)
Taxes on income (loss)	(25)	(27)	(164)	(302)
Net income	(36)	(60)	(311)	(566)
Total assets at period end	570,954	541,848	570,954	541,848
Total deposits at period end	$ 291,251	$ 254,375	$ 291,251	$ 254,375

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)agreement	Dec. 31, 2016USD ($)agreement
Loss Contingency, Information about Litigation Matters [Abstract]
Loan Balance of Swap Commitment	$ 14.2
Loss Contingency, Lawsuit Filing Date	March 18, 2011
Derivative Asset, Number of Instruments Held | agreement	8	7
Interest rate swap agreement Notional amount	$ 51.6	$ 34.7
Loan commitments	429.3	429.4
Letters of credit	$ 6.1	$ 7.2