Independent Bank (IBTX) 10-Q 30 Oct 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 29, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	IBTX
Entity Registrant Name	Independent Bank Group, Inc.
Entity Central Index Key	1,564,618
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		17,107,444

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 126,991	$ 153,158
Interest-bearing deposits in other banks	226,959	170,889
Cash and cash equivalents	353,950	324,047
Securities available for sale (amortized cost of $196,695 and $203,277, respectively)	200,188	206,062
Loans held for sale	6,218	4,453
Loans, net of allowance for loan losses of $25,088 and $18,552, respectively	3,503,081	3,182,045
Premises and equipment, net	91,154	88,902
Other real estate owned	2,323	4,763
Federal Home Loan Bank (FHLB) of Dallas stock and other restricted stock	13,187	12,321
Bank-owned life insurance (BOLI)	40,590	39,784
Deferred tax asset	5,863	2,235
Goodwill	229,818	229,457
Core deposit intangible, net	11,353	12,455
Other assets	20,614	26,115
Total assets	4,478,339	4,132,639
Deposits:
Noninterest-bearing	884,272	818,022
Interest-bearing	2,649,768	2,431,576
Total deposits	3,534,040	3,249,598
FHLB advances	263,346	229,405
Repurchase agreements	0	4,012
Other borrowings	68,548	69,410
Other borrowings, related parties	2,591	3,320
Junior subordinated debentures	18,147	18,147
Other liabilities	23,410	17,896
Total liabilities	$ 3,910,082	$ 3,591,788
Commitments and contingencies
Stockholders’ equity:
Series A preferred stock (23,938.35 shares issued and outstanding)	$ 23,938	$ 23,938
Common stock (17,111,394 and 17,032,669 shares outstanding, respectively)	171	170
Additional paid-in capital	479,615	476,609
Retained earnings	61,670	37,731
Accumulated other comprehensive income	2,863	2,403
Total stockholders’ equity	568,257	540,851
Total liabilities and stockholders’ equity	$ 4,478,339	$ 4,132,639

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Amortized cost of securities available for sale	$ 196,695	$ 203,277
Allowance for loan losses	$ 25,088	$ 18,552
Preferred stock, shares issued (shares)	23,938.35	23,938.35
Preferred stock, shares outstanding (shares)	23,938.35	23,938.35
Common stock, shares outstanding (shares)	17,111,394	17,032,669

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income:
Interest and fees on loans	$ 42,145	$ 35,633	$ 123,350	$ 93,637
Interest on taxable securities	393	711	1,553	2,187
Interest on nontaxable securities	461	404	1,324	1,028
Interest on interest-bearing deposits and other	131	192	386	328
Total interest income	43,130	36,940	126,613	97,180
Interest expense:
Interest on deposits	3,067	2,530	8,794	6,874
Interest on FHLB advances	773	975	2,243	2,792
Interest on repurchase agreements and other borrowings	1,064	871	3,229	1,142
Interest on junior subordinated debentures	137	133	400	402
Total interest expense	5,041	4,509	14,666	11,210
Net interest income	38,089	32,431	111,947	85,970
Provision for loan losses	3,932	976	7,261	3,608
Net interest income after provision for loan losses	34,157	31,455	104,686	82,362
Noninterest income:
Service charges on deposit accounts	2,165	1,541	5,878	4,205
Mortgage fee income	1,353	1,080	4,082	2,777
Gain on sale of loans	116	1,078	116	1,078
Gain on sale of other real estate	41	20	220	59
Gain on sale of securities available for sale	0	0	90	0
Loss on sale of premises and equipment	(374)	(22)	(374)	(22)
Increase in cash surrender value of BOLI	268	281	806	690
Other	230	232	1,056	876
Total noninterest income	3,799	4,210	11,874	9,663
Noninterest expense:
Salaries and employee benefits	14,918	12,551	43,992	37,797
Occupancy	4,117	3,435	12,054	9,200
Data processing	786	472	2,140	1,420
FDIC assessment	541	426	1,553	1,246
Advertising and public relations	313	204	912	618
Communications	550	498	1,643	1,220
Net other real estate owned expenses (including taxes)	88	122	184	258
Operations of IBG Adriatica, net	0	0	0	23
Other real estate impairment	10	22	35	22
Core deposit intangible amortization	363	361	1,102	859
Professional fees	841	828	2,008	1,792
Acquisition expense, including legal	293	629	793	2,628
Other	3,010	2,614	8,255	6,498
Total noninterest expense	25,830	22,162	74,671	63,581
Income before taxes	12,126	13,503	41,889	28,444
Income tax expense	3,924	4,543	13,664	9,564
Net income	$ 8,202	$ 8,960	$ 28,225	$ 18,880
Basic earnings per share (usd per share)	$ 0.48	$ 0.54	$ 1.64	$ 1.26
Diluted earnings per share (usd per share)	$ 0.47	$ 0.54	$ 1.63	$ 1.25

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 8,202	$ 8,960	$ 28,225	$ 18,880
Other comprehensive income before tax:
Change in net unrealized gains on available for sale securities during the year	1,414	408	798	4,994
Reclassification adjustment for gain on sale of securities available for sale included in net income	0	0	(90)	0
Other comprehensive income before tax	1,414	408	708	4,994
Income tax expense	496	143	248	1,748
Other comprehensive income, net of tax	918	265	460	3,246
Comprehensive income	$ 9,120	$ 9,225	$ 28,685	$ 22,126

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Series A Preferred Stock $.01 Par Value 10 million shares authorized	Common Stock $.01 Par Value 100 million shares authorized	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (shares) at Dec. 31, 2013			12,330,158
Beginning balance at Dec. 31, 2013	$ 233,772	$ 0	$ 123	$ 222,116	$ 12,663	$ (1,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,880				18,880
Other comprehensive income, net of tax	3,246					3,246
Offering costs related to acquired bank	550
Restricted stock forfeited (shares)			(394)
Restricted stock forfeited	0			0	0
Restricted stock granted (shares)			189,069
Restricted stock granted	0		$ 2	(2)
Stock based compensation expense	2,011			2,011
Income tax benefit (deficiency) on restricted stock vested	1,326			1,326
Preferred stock dividends	(109)				(109)
Dividends ($0.24 per share in 2015 and $0.18 per share in 2014)	(2,720)				(2,720)
Series A preferred stock issued	23,938	23,938
Common stock issued for acquisition of bank, net of offering costs of $550 (shares)			3,851,480
Common stock issued for acquisition of bank, net of offering costs of $550	219,967		$ 39	219,928
Ending balance (shares) at Sep. 30, 2014			16,370,313
Ending balance at Sep. 30, 2014	500,311	23,938	$ 164	445,379	28,714	2,116
Beginning balance (shares) at Dec. 31, 2014			17,032,669
Beginning balance at Dec. 31, 2014	540,851	23,938	$ 170	476,609	37,731	2,403
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,225				28,225
Other comprehensive income, net of tax	460					460
Offering costs related to acquired bank	(144)			(144)
Restricted stock forfeited (shares)			(11,399)
Restricted stock forfeited	0
Restricted stock granted (shares)			90,124
Restricted stock granted	0		$ 1	(1)
Stock based compensation expense	3,214			3,214
Income tax benefit (deficiency) on restricted stock vested	(63)			(63)
Preferred stock dividends	(180)				(180)
Dividends ($0.24 per share in 2015 and $0.18 per share in 2014)	(4,106)				(4,106)
Ending balance (shares) at Sep. 30, 2015			17,111,394
Ending balance at Sep. 30, 2015	$ 568,257	$ 23,938	$ 171	$ 479,615	$ 61,670	$ 2,863

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Dividends paid (usd per share)	$ 0.24	$ 0.18
Common stock par value (in usd per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	100,000,000	100,000,000
Preferred stock par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	10,000,000	10,000,000
Offering costs related to acquired bank	$ (144)	$ 550

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 28,225	$ 18,880
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	4,646	3,787
Amortization of core deposit intangibles	1,102	859
Amortization of premium on securities, net	1,160	1,506
Stock based compensation expense	3,214	2,011
FHLB stock dividends	(32)	(33)
Gain on sale of securities available for sale	(90)	0
Net loss on sale of premises and equipment	374	22
Gain on sale of loans	(116)	(1,078)
Gain recognized on other real estate transactions	(220)	(59)
Impairment of other real estate	35	22
Deferred tax (benefit) expense	(2,992)	128
Provision for loan losses	7,261	3,608
Increase in cash surrender value of life insurance	(806)	(690)
Loans originated for sale	(166,506)	(103,165)
Proceeds from sale of loans	164,741	104,737
Net change in other assets	1,818	(4,981)
Net change in other liabilities	(4,678)	(1,587)
Net cash provided by operating activities	37,136	23,967
Cash flows from investing activities:
Proceeds from maturities, calls and pay downs of securities available for sale	528,863	67,927
Proceeds from sale of securities available for sale	12,128	0
Purchases of securities available for sale	(522,599)	(28,364)
Proceeds from sale of loans	8,765	12,147
Net (purchases) redemptions of FHLB stock	(834)	625
Net loans originated	(337,008)	(324,030)
Additions to premises and equipment	(11,500)	(3,423)
Proceeds from sale of premises and equipment	4,228	13
Proceeds from sale of other real estate owned	2,324	1,923
Capitalized additions to other real estate owned	(10)	(28)
Cash received from acquired banks	0	167,771
Cash paid in connection with acquisitions	0	(44,010)
Net cash used in investing activities	(315,643)	(149,449)
Cash flows from financing activities:
Net increase in demand deposits, NOW and savings accounts	191,392	85,935
Net increase in time deposits	89,038	91,139
Proceeds from FHLB advances	230,000	384,000
Repayments of FHLB advances	(196,059)	(342,060)
Net change in repurchase agreements	0	1,502
Repayments of other borrowings	(1,591)	0
Proceeds from other borrowings	0	65,000
Offering costs paid in connection with acquired banks	(144)	(550)
Dividends paid	(4,226)	(2,769)
Net cash provided by financing activities	308,410	282,197
Net change in cash and cash equivalents	29,903	156,715
Cash and cash equivalents at beginning of year	324,047	93,054
Cash and cash equivalents at end of period	$ 353,950	$ 249,769

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations: Independent Bank Group, Inc. (IBG) through its subsidiary, Independent Bank, a Texas state banking corporation (Bank) (collectively known as the Company), provides a full range of banking services to individual and corporate customers in the North Texas, Central Texas and Houston areas through its various branch locations in those areas. The Company is engaged in traditional community banking activities, which include commercial and retail lending, deposit gathering, investment and liquidity management activities. The Company’s primary deposit products are demand deposits, money market accounts and certificates of deposit, and its primary lending products are commercial business and real estate, real estate mortgage and consumer loans. Basis of Presentation: The accompanying consolidated financial statements include the accounts of IBG, its wholly-owned subsidiaries, the Bank and IBG Adriatica Holdings, Inc. (Adriatica) and the Bank’s wholly-owned subsidiaries, IBG Real Estate Holdings, Inc., IBG Aircraft Acquisition, Inc. and IBG Aircraft Company III. IBG Aircraft Company III was formed in the third quarter 2015 to hold the Company's new aircraft. Adriatica was formed in 2011 to acquire a mixed use residential and retail real estate development in McKinney, Texas. Adriatica became inactive during the first quarter of 2014. All material intercompany transactions and balances have been eliminated in consolidation. In addition, the Company wholly-owns IB Trust I (Trust I), IB Trust II (Trust II), IB Trust III (Trust III), IB Centex Trust I (Centex Trust I) and Community Group Statutory Trust I (CGI Trust I). The Trusts were formed to issue trust preferred securities and do not meet the criteria for consolidation. The consolidated interim financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in the Company's Annual Report of Form10-K for the year ended December 31, 2014. The consolidated statement of condition at December 31, 2014 had been derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. Segment Reporting: The Company has one reportable segment. The Company’s chief operating decision-maker uses consolidated results to make operating and strategic decisions. Subsequent events: Companies are required to evaluate events and transactions that occur after the balance sheet date but before the date the financial statements are issued. They must recognize in the financial statements the effect of all events or transactions that provide additional evidence of conditions that existed at the balance sheet date, including the estimates inherent in the financial statement preparation process. Entities shall not recognize the impact of events or transactions that provide evidence about conditions that did not exist at the balance sheet date but arose after that date. The Company has evaluated subsequent events through the date of filing these financial statements with the Securities and Exchange Commission (SEC) and noted no subsequent events requiring financial statement recognition or disclosure, except as disclosed in Note 12. Earnings per share: Basic earnings per common share are net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. The unvested share-based payment awards that contain rights to non forfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under stock warrants. The participating non vested common stock was not included in dulitive shares as it was anti-dilutive. Proceeds from the assumed exercise of dilutive stock warrants are assumed to be used to repurchase common stock at the average market price. Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Basic earnings per share: Net income $ 8,202 $ 8,960 $ 28,225 $ 18,880 Less: Preferred stock dividends (60 ) (60 ) (180 ) (109 ) Net income after preferred stock dividends 8,142 8,900 28,045 18,771 Less: Undistributed earnings allocated to participating securities 131 157 492 291 Dividends paid on participating securities 27 19 84 49 Net income available to common shareholders $ 7,984 $ 8,724 $ 27,469 $ 18,431 Weighted-average basic shares outstanding 16,778,405 16,046,935 16,753,526 14,657,873 Basic earnings per share $ 0.48 $ 0.54 $ 1.64 $ 1.26 Diluted earnings per share: Net income available to common shareholders $ 7,984 $ 8,724 $ 27,469 $ 18,431 Total weighted-average basic shares outstanding 16,778,405 16,046,935 16,753,526 14,657,873 Add dilutive stock warrants 89,191 98,725 85,161 100,595 Total weighted-average diluted shares outstanding 16,867,596 16,145,660 16,838,687 14,758,468 Diluted earnings per share $ 0.47 $ 0.54 $ 1.63 $ 1.25 Anti-dilutive participating securities 50,770 73,120 55,802 122,209

Statement of Cash Flows

Statement of Cash Flows	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Statement of Cash Flows	Statement of Cash Flows As allowed by the accounting standards, the Company has chosen to report on a net basis its cash receipts and cash payments for time deposits accepted and repayments of those deposits, and loans made to customers and principal collections on those loans. The Company uses the indirect method to present cash flows from operating activities. Other supplemental cash flow information is presented below: Nine Months Ended September 30, 2015 2014 Cash transactions: Interest expense paid $ 15,794 $ 10,222 Income taxes paid $ 16,600 $ 7,730 Noncash transactions: Accrued preferred stock dividends $ 60 $ 60 Transfers of loans to other real estate owned $ 221 $ 1,088 Loans to facilitate the sale of other real estate owned $ 159 $ 48 Securities purchased, not yet settled $ 12,880 $ — Excess tax benefit (tax deficiency) on restricted stock vested $ (63 ) $ 1,326 Transfer of bank premises to other real estate $ — $ 356 Transfer of repurchase agreements to deposits $ 4,012 $ — The supplemental schedule of noncash investing activities from Company acquisition activity is as follows: Nine Months Ended September 30, 2015 2014 Assets acquired Cash and cash equivalents $ — $ 167,771 Securities available for sale — 75,881 Loans — 856,899 Premises and equipment — 9,811 Other real estate owned — 1,224 Goodwill — 172,151 Core deposit intangibles — 8,147 Other assets — 27,804 Total assets $ — $ 1,319,688 Liabilities assumed: Deposits $ — $ 925,762 Repurchase agreements — 3,733 FHLB advances — 95,000 Other liabilities — 6,728 Total liabilities $ — $ 1,031,223 Cash paid to shareholders of acquired banks $ — $ 44,010 Series A preferred stock exchanged in connection with acquired bank $ — $ 23,938 Fair value of common stock issued to shareholders of acquired banks $ — $ 220,517 In addition, the following measurement-period adjustments were made during the period relating to Company acquisition activity: Nine Months Ended September 30, 2015 2014 Assets acquired: Loans $ — $ (328 ) Goodwill 361 752 Other real estate owned (373 ) — Core deposit intangibles — (18 ) Deferred tax asset 193 109 Other assets — 10 Total assets $ 181 $ 525 Liabilities assumed: Deposits $ — $ 505 Other liabilities 181 20 Total liabilities $ 181 $ 525

Securities Available for Sale

Securities Available for Sale	9 Months Ended
	Sep. 30, 2015
Available-for-sale Securities [Abstract]
Securities Available for Sale	Securities Available for Sale Securities available for sale have been classified in the consolidated balance sheets according to management’s intent. The amortized cost of securities and their approximate fair values at September 30, 2015 and December 31, 2014, are as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities Available for Sale September 30, 2015: U.S. treasuries $ 1,000 $ 6 $ — $ 1,006 Government agency securities 80,905 445 (36 ) 81,314 Obligations of state and municipal subdivisions 69,510 1,875 (305 ) 71,080 Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 45,280 1,509 (1 ) 46,788 $ 196,695 $ 3,835 $ (342 ) $ 200,188 December 31, 2014: U.S. treasuries $ 999 $ 7 $ — $ 1,006 Government agency securities 58,174 199 (350 ) 58,023 Obligations of state and municipal subdivisions 75,599 1,837 (537 ) 76,899 Corporate bonds 1,068 13 — 1,081 Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 67,437 1,616 — 69,053 $ 203,277 $ 3,672 $ (887 ) $ 206,062 Securities with a carrying amount of approximately $ 135,981 and $ 174,741 at September 30, 2015 and December 31, 2014, respectively, were pledged to secure public fund deposits and repurchase agreements. Proceeds from sale of securities available for sale and gross gains and gross losses for the three and nine months ended September 30, 2015 and 2014 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Proceeds from sale — — 12,128 — Gross gains — — 90 — Gross losses — — — — The amortized cost and estimated fair value of securities available for sale at September 30, 2015 , by contractual maturity, are shown below. Maturities of pass-through certificates will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2015 Securities Available for Sale Amortized Cost Fair Value Due in one year or less $ 5,394 $ 5,423 Due from one year to five years 80,718 81,047 Due from five to ten years 29,737 30,124 Thereafter 35,566 36,806 151,415 153,400 Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 45,280 46,788 $ 196,695 $ 200,188 The number of securities, unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of September 30, 2015 and December 31, 2014, are summarized as follows: Less Than 12 Months Greater Than 12 Months Total Description of Securities Number of Securities Estimated Fair Value Unrealized Losses Number of Securities Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Securities Available for Sale September 30, 2015 Government agency securities 1 $ 2,999 $ (1 ) 9 $ 14,965 $ (35 ) $ 17,964 $ (36 ) Obligations of state and municipal subdivisions 24 9,522 (56 ) 21 10,043 (249 ) 19,565 (305 ) Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 1 91 (1 ) — — — 91 (1 ) 26 $ 12,612 $ (58 ) 30 $ 25,008 $ (284 ) $ 37,620 $ (342 ) December 31, 2014 Government agency securities 6 $ 6,396 $ (24 ) 14 $ 22,671 $ (326 ) $ 29,067 $ (350 ) Obligations of state and municipal subdivisions 44 16,636 (197 ) 13 8,541 (340 ) 25,177 (537 ) 50 $ 23,032 $ (221 ) 27 $ 31,212 $ (666 ) $ 54,244 $ (887 ) Unrealized losses are generally due to changes in interest rates. The Company has the intent to hold these securities until maturity or a forecasted recovery, and it is more likely than not that the Company will not have to sell the securities before the recovery of their cost basis. As such, the losses are deemed to be temporary.

Loans, Net and Allowance for Lo

Loans, Net and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans, Net and Allowance for Loan Losses	Loans, Net and Allowance for Loan Losses Loans, net at September 30, 2015 and December 31, 2014, consisted of the following: September 30, December 31, 2015 2014 Commercial $ 668,001 $ 672,052 Real estate: Commercial 1,777,401 1,450,434 Commercial construction, land and land development 324,007 334,964 Residential 549,733 514,025 Single family interim construction 140,144 138,278 Agricultural 37,207 38,822 Consumer 32,621 52,267 Other 161 242 3,529,275 3,201,084 Deferred loan fees (1,106 ) (487 ) Allowance for loan losses (25,088 ) (18,552 ) $ 3,503,081 $ 3,182,045 The Company has certain lending policies and procedures in place that are designed to maximize loan income within an acceptable level of risk. Management reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies and non-performing and potential problem loans. Commercial loans are underwritten after evaluating and understanding the borrower’s ability to operate profitably and prudently expand its business. The Company’s management examines current and projected cash flows to determine the ability of the borrower to repay their obligations as agreed. Commercial loans are primarily made based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. These cash flows, however, may not be as expected and the value of collateral securing the loans may fluctuate. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short term loans may be made on an unsecured basis. Additionally, our commercial loan portfolio includes loans made to customers in the energy industry, which is a complex, technical and cyclical industry. Experienced bankers with specialized energy lending experience originate our energy loans. Companies in this industry produce, extract, develop, exploit and explore for oil and natural gas. Loans are primarily collateralized with proven producing oil and gas reserves based on a technical evaluation of these reserves. At September 30, 2015 and December 31, 2014, there were approximately $ 209.6 million and $ 231.7 million of exploration and production (E&P) energy loans outstanding, respectively. Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves higher loan principal amounts, and the repayment of these loans is generally largely dependent on the successful operation of the property or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. The properties securing the Company’s commercial real estate portfolio are diverse in terms of type and geographic location. Management monitors the diversification of the portfolio on a quarterly basis by type and geographic location. Management also tracks the level of owner occupied property versus non owner occupied property. Land and commercial land development loans are underwritten using feasibility studies, independent appraisal reviews and financial analysis of the developers or property owners. Generally, borrowers must have a proven track record of success. Commercial construction loans are generally based upon estimates of cost and value of the completed project. These estimates may not be accurate. Commercial construction loans often involve the disbursement of substantial funds with the repayment dependent on the success of the ultimate project. Sources of repayment for these loans may be pre-committed permanent financing or sale of the developed property. The loans in this portfolio are geographically diverse and due to the increased risk are monitored closely by management and the board of directors on a quarterly basis. Residential real estate and single family interim construction loans are underwritten primarily based on borrowers’ credit scores, documented income and minimum collateral values. Relatively small loan amounts are spread across many individual borrowers, which minimizes risk in the residential portfolio. In addition, management evaluates trends in past dues and current economic factors on a regular basis. Agricultural loans are collateralized by real estate and/or agricultural-related assets. Agricultural real estate loans are primarily comprised of loans for the purchase of farmland. Loan-to-value ratios on loans secured by farmland generally do not exceed 80% and have amortization periods limited to twenty years. Agricultural non-real estate loans are generally comprised of term loans to fund the purchase of equipment, livestock and seasonal operating lines to grain farmers to plant and harvest corn and soybeans. Specific underwriting standards have been established for agricultural-related loans, including the establishment of projections for each operating year based on industry developed estimates of farm input costs and expected commodity yields and prices. Operating lines are typically written for one year and secured by the crop and other farm assets as considered necessary. Agricultural loans carry significant credit risks as they involve larger balances concentrated with single borrowers or groups of related borrowers. In addition, repayment of such loans depends on the successful operation or management of the farm property securing the loan or for which an operating loan is utilized. Farming operations may be affected by adverse weather conditions such as drought, hail or floods that can severely limit crop yields. Consumer loans represent less than 2% of the outstanding total loan portfolio. Collateral consists primarily of automobiles and other personal assets. Credit score analysis is used to supplement the underwriting process. Most of the Company’s lending activity occurs within the State of Texas, primarily in the north, central and southeast Texas regions. A large percentage of the Company’s portfolio consists of commercial and residential real estate loans. As of September 30, 2015 and December 31, 2014 , there were no concentrations of loans related to a single industry in excess of 10% of total loans. The allowance for loan losses is an amount that management believes will be adequate to absorb estimated losses relating to specifically identified loans, as well as probable credit losses inherent in the balance of the loan portfolio. The allowance is derived from the following two components: 1) allowances established on individual impaired loans, which are based on a review of the individual characteristics of each loan, including the customer’s ability to repay the loan, the underlying collateral values, and the industry in which the customer operates, and 2) allowances based on actual historical loss experience for the last three years for similar types of loans in the Company’s loan portfolio adjusted for primarily changes in the lending policies and procedures; collection, charge-off and recovery practices; nature and volume of the loan portfolio; change in value of underlying collateral; volume and severity of nonperforming loans; existence and effect of any concentrations of credit and the level of such concentrations and current, national and local economic and business conditions. This second component also includes an unallocated allowance to cover uncertainties that could affect management’s estimate of probable losses. The unallocated allowance reflects the imprecision inherent in the underlying assumptions used in the methodologies for estimating this component. The Company’s management continually evaluates the allowance for loan losses determined from the allowances established on individual loans and the amounts determined from historical loss percentages adjusted for the qualitative factors above. Should any of the factors considered by management change, the Company’s estimate of loan losses could also change and would affect the level of future provision expense. While the calculation of the allowance for loan losses utilizes management’s best judgment and all the information available, the adequacy of the allowance for loan losses is dependent on a variety of factors beyond the Company’s control, including, among other things, the performance of the entire loan portfolio, the economy, changes in interest rates and the view of regulatory authorities towards loan classifications. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Bank’s allowance for loan losses, and may require the Bank to make additions to the allowance based on their judgment about information available to them at the time of their examinations. Loans requiring an allocated loan loss provision are generally identified at the servicing officer level based on review of weekly past due reports and/or the loan officer’s communication with borrowers. In addition, past due loans are discussed at weekly officer loan committee meetings to determine if classification is warranted. The Company’s credit department has implemented an internal risk based loan review process to identity potential internally classified loans that supplements the annual independent external loan review. The external review generally covers all loans greater than $2.4 million . These reviews include analysis of borrower’s financial condition, payment histories and collateral values to determine if a loan should be internally classified. Generally, once classified, an impaired loan analysis is completed by the credit department to determine if the loan is impaired and the amount of allocated allowance required. The Texas economy, specifically the Company’s lending area of north, central and southeast Texas, has generally performed better than certain other parts of the country. However, the recent drop in oil prices has the potential to have a negative impact on the Texas economy. The risk of loss associated with all segments of the portfolio could increase due to this impact. The Company increased its allowance for loan losses during the quarter ended September 30, 2015 in consideration of this risk to the energy portfolio. The economy and other risk factors are minimized by the Company’s underwriting standards, which include the following principles: 1) financial strength of the borrower including strong earnings, high net worth, significant liquidity and acceptable debt to worth ratio, 2) managerial business competence, 3) ability to repay, 4) loan to value, 5) projected cash flow and 6) guarantor financial statements as applicable. The following is a summary of the activity in the allowance for loan losses by loan class for the three and nine months ended September 30, 2015 and 2014 : Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Unallocated Total Three months ended September 30, 2015 Balance at the beginning of period $ 6,632 $ 11,720 $ 2,318 $ 738 $ 234 $ 181 $ — $ (59 ) $ 21,764 Provision for loan losses 3,866 318 (91 ) (19 ) (17 ) 48 — (173 ) 3,932 Charge-offs (500 ) (69 ) (9 ) — — (65 ) — — (643 ) Recoveries 17 7 1 — — 10 — — 35 Balance at end of period $ 10,015 $ 11,976 $ 2,219 $ 719 $ 217 $ 174 $ — $ (232 ) $ 25,088 Nine months ended September 30, 2015 Balance at the beginning of period $ 5,051 $ 10,110 $ 2,205 $ 669 $ 246 $ 146 $ — $ 125 $ 18,552 Provision for loan losses 5,547 1,898 18 50 (29 ) 134 — (357 ) 7,261 Charge-offs (606 ) (69 ) (9 ) — — (142 ) — — (826 ) Recoveries 23 37 5 — — 36 — — 101 Balance at end of period $ 10,015 $ 11,976 $ 2,219 $ 719 $ 217 $ 174 $ — $ (232 ) $ 25,088 Three months ended September 30, 2014 Balance at the beginning of period $ 3,676 $ 9,100 $ 2,291 $ 584 $ 272 $ 349 $ — $ (53 ) $ 16,219 Provision for loan losses 427 706 4 (26 ) 21 (109 ) — (47 ) 976 Charge-offs — (318 ) — — — (76 ) — — (394 ) Recoveries 6 23 3 — — 7 — — 39 Balance at end of period $ 4,109 $ 9,511 $ 2,298 $ 558 $ 293 $ 171 $ — $ (100 ) $ 16,840 Nine months ended September 30, 2014 Balance at the beginning of period $ 2,401 $ 7,872 $ 2,440 $ 577 $ 238 $ 363 $ — $ 69 $ 13,960 Provision for loan losses 2,061 1,907 (117 ) (30 ) 55 (99 ) — (169 ) 3,608 Charge-offs (368 ) (339 ) (32 ) — — (118 ) — — (857 ) Recoveries 15 71 7 11 — 25 — — 129 Balance at end of period $ 4,109 $ 9,511 $ 2,298 $ 558 $ 293 $ 171 $ — $ (100 ) $ 16,840 The following table details the amount of the allowance for loan losses and recorded investment in loans by class as of September 30, 2015 and December 31, 2014: Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Unallocated Total September 30, 2015 Allowance for losses: Individually evaluated for impairment $ 2,481 $ 64 $ — $ — $ — $ 9 $ — $ — $ 2,554 Collectively evaluated for impairment 7,534 11,912 2,219 719 217 165 — (232 ) 22,534 Loans acquired with deteriorated credit quality — — — — — — — — — Ending balance $ 10,015 $ 11,976 $ 2,219 $ 719 $ 217 $ 174 $ — $ (232 ) $ 25,088 Loans: Individually evaluated for impairment $ 4,317 $ 5,302 $ 3,083 $ — $ — $ 119 $ — $ — $ 12,821 Collectively evaluated for impairment 660,726 2,050,554 545,420 140,144 37,207 32,480 161 — 3,466,692 Acquired with deteriorated credit quality 2,958 45,552 1,230 — — 22 — — 49,762 Ending balance $ 668,001 $ 2,101,408 $ 549,733 $ 140,144 $ 37,207 $ 32,621 $ 161 $ — $ 3,529,275 December 31, 2014 Allowance for losses: Individually evaluated for impairment $ 339 $ 124 $ 8 $ — $ — $ 4 $ — $ — $ 475 Collectively evaluated for impairment 4,712 9,986 2,197 669 246 142 — 125 18,077 Loans acquired with deteriorated credit quality — — — — — — — — — Ending balance $ 5,051 $ 10,110 $ 2,205 $ 669 $ 246 $ 146 $ — $ 125 $ 18,552 Loans: Individually evaluated for impairment $ 1,479 $ 6,768 $ 3,387 $ — $ — $ 75 $ — $ — $ 11,709 Collectively evaluated for impairment 666,830 1,724,514 508,833 138,278 38,822 52,159 242 — 3,129,678 Acquired with deteriorated credit quality 3,743 54,116 1,805 — — 33 — — 59,697 Ending balance $ 672,052 $ 1,785,398 $ 514,025 $ 138,278 $ 38,822 $ 52,267 $ 242 $ — $ 3,201,084 Nonperforming loans by loan class at September 30, 2015 and December 31, 2014, are summarized as follows: Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Total September 30, 2015 Nonaccrual loans $ 4,297 $ 32 $ 496 $ — $ — $ 119 $ — $ 4,944 Loans past due 90 days and still accruing 16 — 95 — — — — 111 Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing) 20 4,061 2,576 — — — — 6,657 $ 4,333 $ 4,093 $ 3,167 $ — $ — $ 119 $ — $ 11,712 December 31, 2014 Nonaccrual loans $ 1,449 $ 70 $ 2,117 $ — $ — $ 67 $ — $ 3,703 Loans past due 90 days and still accruing 157 288 — — — 6 — 451 Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing) 30 4,668 1,254 — — 8 — 5,960 $ 1,636 $ 5,026 $ 3,371 $ — $ — $ 81 $ — $ 10,114 The accrual of interest is discontinued on a loan when management believes after considering collection efforts and other factors that the borrower's financial condition is such that collection of interest is doubtful. All interest accrued but not collected for loans that are placed on nonaccrual status or charged-off is reversed against interest income. Cash collections on nonaccrual loans are generally credited to the loan receivable balance, and no interest income is recognized on those loans until the principal balance has been collected. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Impaired loans are those loans where it is probable that all amounts due will not be collected according to contractual terms of the loan agreement. The Company has identified these loans through its normal loan review procedures. Impaired loans are measured based on 1) the present value of expected future cash flows discounted at the loans effective interest rate; 2) the loan's observable market price; or 3) the fair value of collateral if the loan is collateral dependent. Substantially all of the Company’s impaired loans are measured at the fair value of the collateral. In limited cases, the Company may use the other methods to determine the level of impairment of a loan if such loan is not collateral dependent. All commercial, real estate, agricultural loans and troubled debt restructurings are considered for individual impairment analysis. Smaller balance consumer loans are collectively evaluated for impairment. Impaired loans by loan class at September 30, 2015 and December 31, 2014, are summarized as follows: Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Total September 30, 2015 Recorded investment in impaired loans: Impaired loans with an allowance for loan losses $ 4,195 $ 1,417 $ — $ — $ — $ 23 $ — $ 5,635 Impaired loans with no allowance for loan losses 122 3,885 3,083 — — 96 — 7,186 Total $ 4,317 $ 5,302 $ 3,083 $ — $ — $ 119 $ — $ 12,821 Unpaid principal balance of impaired loans $ 4,322 $ 5,803 $ 3,175 $ — $ — $ 141 $ — $ 13,441 Allowance for loan losses on impaired loans $ 2,481 $ 64 $ — $ — $ — $ 9 $ — $ 2,554 December 31, 2014 Recorded investment in impaired loans: Impaired loans with an allowance for loan losses $ 1,475 $ 2,056 $ 13 $ — $ — $ 7 $ — $ 3,551 Impaired loans with no allowance for loan losses 4 4,712 3,374 — — 68 — 8,158 Total $ 1,479 $ 6,768 $ 3,387 $ — $ — $ 75 $ — $ 11,709 Unpaid principal balance of impaired loans $ 1,482 $ 7,274 $ 3,605 $ — $ — $ 93 $ — $ 12,454 Allowance for loan losses on impaired loans $ 339 $ 124 $ 8 $ — $ — $ 4 $ — $ 475 For the three months ended September 30, 2015 Average recorded investment in impaired loans $ 4,997 $ 5,797 $ 3,182 $ — $ — $ 101 $ — $ 14,077 Interest income recognized on impaired loans $ — $ 88 $ 44 $ — $ — $ — $ — $ 132 For the nine months ended September 30, 2015 Average recorded investment in impaired loans $ 4,343 $ 6,212 $ 3,242 $ — $ — $ 88 $ — $ 13,885 Interest income recognized on impaired loans $ 48 $ 258 $ 136 $ — $ — $ 2 $ — $ 444 For the three months ended September 30, 2014 Average recorded investment in impaired loans $ 139 $ 7,538 $ 3,232 $ — $ — $ 73 $ — $ 10,982 Interest income recognized on impaired loans $ 2 $ 101 $ 44 $ — $ — $ 1 $ — $ 148 For the nine months ended September 30, 2014 Average recorded investment in impaired loans $ 257 $ 7,663 $ 3,219 $ 43 $ — $ 68 $ — $ 11,250 Interest income recognized on impaired loans $ 7 $ 302 $ 126 $ — $ — $ 2 $ — $ 437 Certain impaired loans have adequate collateral and do not require a related allowance for loan loss. The Company will charge off that portion of any loan which management considers a loss. Commercial and real estate loans are generally considered for charge-off when exposure beyond collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition. The restructuring of a loan is considered a “troubled debt restructuring” if both 1) the borrower is experiencing financial difficulties and 2) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, extending amortization and other actions intended to minimize potential losses. A “troubled debt restructured” loan is identified as impaired and measured for credit impairment as of each reporting period in accordance with the guidance in Accounting Standards Codification (ASC) 310-10-35. The recorded investment in troubled debt restructurings, including those on nonaccrual, was $6,669 and $7,302 as of September 30, 2015 and December 31, 2014. Following is a summary of loans modified under troubled debt restructurings during the three months ended September 30, 2015 and 2014 : . Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Total Troubled debt restructurings during the three months ended September 30, 2015 Number of contracts — — — — — — — — Pre-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Post-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Troubled debt restructurings during the nine months ended September 30, 2015 Number of contracts — — — — — — — — Pre-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Post-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Troubled debt restructurings during the three months ended September 30, 2014 Number of contracts — — — — — 1 — 1 Pre-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ 9 $ — $ 9 Post-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ 9 $ — $ 9 Troubled debt restructurings during the nine months ended September 30, 2014 Number of contracts — 2 — — — — 1 3 Pre-restructuring outstanding recorded investment $ — $ 1,108 $ — $ — $ — $ — $ 9 $ 1,117 Post-restructuring outstanding recorded investment $ — $ 1,108 $ — $ — $ — $ — $ 9 $ 1,117 At September 30, 2015 and 2014, there were no loans modified under troubled debt restructurings during the previous twelve month period that subsequently defaulted during the three and nine months ended September 30, 2015 and 2014, respectively. At September 30, 2015 and 2014, the Company had no commitments to lend additional funds to any borrowers with loans whose terms have been modified under troubled debt restructurings. Modifications primarily relate to extending the amortization periods of the loans and interest rate concessions. The majority of these loans were identified as impaired prior to restructuring; therefore, the modifications did not materially impact the Company’s determination of the allowance for loan losses. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. The following table presents information regarding the aging of past due loans by loan class as of September 30, 2015 and December 31, 2014: Loans 30-89 Days Past Due Loans 90 or More Past Due Total Past Due Loans Current Loans Total Loans September 30, 2015 Commercial $ 582 $ 4,294 $ 4,876 $ 663,125 $ 668,001 Commercial real estate, land and land development 2,380 — 2,380 2,099,028 2,101,408 Residential real estate 475 375 850 548,883 549,733 Single-family interim construction — — — 140,144 140,144 Agricultural 186 — 186 37,021 37,207 Consumer 143 26 169 32,452 32,621 Other — — — 161 161 $ 3,766 $ 4,695 $ 8,461 $ 3,520,814 $ 3,529,275 December 31, 2014 Commercial $ 6,006 $ 157 $ 6,163 $ 665,889 $ 672,052 Commercial real estate, land and land development 973 288 1,261 1,784,137 1,785,398 Residential real estate 1,258 554 1,812 512,213 514,025 Single-family interim construction 410 — 410 137,868 138,278 Agricultural — — — 38,822 38,822 Consumer 1,899 8 1,907 50,360 52,267 Other — — — 242 242 $ 10,546 $ 1,007 $ 11,553 $ 3,189,531 $ 3,201,084 The Company’s internal classified report is segregated into the following categories: 1) Pass/Watch, 2) Other Assets Especially Mentioned (OAEM), 3) Substandard and 4) Doubtful. The loans placed in the Pass/Watch category reflect the Company’s opinion that the loans reflect potential weakness that requires monitoring on a more frequent basis. The loans in the OAEM category reflect the Company’s opinion that the credit contains weaknesses which represent a greater degree of risk and warrant extra attention. These loans are reviewed monthly by officers and senior management to determine if a change in category is warranted. The loans placed in the Substandard category are considered to be potentially inadequately protected by the current debt service capacity of the borrower and/or the pledged collateral. These credits, even if apparently protected by collateral value, have shown weakness related to adverse financial, managerial, economic, market or political conditions, which may jeopardize repayment of principal and interest. There is possibility that some future loss could be sustained by the Company if such weakness is not corrected. The Doubtful category includes loans that are in default or principal exposure is probable. Substandard and Doubtful loans are individually evaluated to determine if they should be classified as impaired and an allowance is allocated if deemed necessary under ASC 310-10. The loans that are not impaired are included with the remaining “pass” credits in determining the portion of the allowance for loan loss based on historical loss experience and other qualitative factors. The portfolio is segmented into categories including: commercial loans, consumer loans, commercial real estate loans, residential real estate loans and agricultural loans. The adjusted historical loss percentage is applied to each category. Each category is then added together to determine the allowance allocated under ASC 450-20. A summary of loans by credit quality indicator by class as of September 30, 2015 and December 31, 2014 , is as follows: Pass Pass/ Watch OAEM Substandard Doubtful Total September 30, 2015 Commercial $ 532,576 $ 78,006 $ 24,311 $ 33,108 $ — $ 668,001 Commercial real estate, construction, land and land development 2,077,651 10,635 2,749 10,373 — 2,101,408 Residential real estate 540,756 2,001 1,954 5,022 — 549,733 Single-family interim construction 140,144 — — — — 140,144 Agricultural 35,169 226 1,812 — — 37,207 Consumer 32,375 76 35 135 — 32,621 Other 161 — — — — 161 $ 3,358,832 $ 90,944 $ 30,861 $ 48,638 $ — $ 3,529,275 December 31, 2014 Commercial $ 647,894 $ 16,919 $ 977 $ 6,262 $ — $ 672,052 Commercial real estate, construction, land and land development 1,759,533 8,667 6,008 11,190 — 1,785,398 Residential real estate 505,920 2,188 325 5,592 — 514,025 Single-family interim construction 138,278 — — — — 138,278 Agricultural 38,422 57 — 343 — 38,822 Consumer 52,055 39 50 123 — 52,267 Other 242 — — — — 242 $ 3,142,344 $ 27,870 $ 7,360 $ 23,510 $ — $ 3,201,084 The Company has acquired certain loans which experienced credit deterioration since origination (purchased credit impaired (PCI) loans). Accretion on PCI loans is based on estimated future cash flows, regardless of contractual maturity. There are no PCI loans outstanding for acquisitions prior to 2012. No additional PCI loans were acquired during the nine months ended September 30, 2015. The following table summarizes the outstanding balance and related carrying amount of purchased credit impaired loans by acquired bank as of the respective acquisition date for the acquisitions occurring in 2014: Acquisition Date October 1, 2014 April 15, 2014 January 1, 2014 Houston City Bancshares, Inc. BOH Holdings, Inc. Live Oak Financial Corp. Outstanding balance $ 12,021 $ 55,718 $ 3,583 Nonaccretable difference (1,240 ) (5,798 ) (519 ) Accretable yield (561 ) (2,579 ) (182 ) Carrying amount $ 10,220 $ 47,341 $ 2,882 The carrying amount of all acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2015 and December 31, 2014, were as follows: September 30, 2015 December 31, 2014 Outstanding balance $ 57,648 $ 69,371 Carrying amount 49,762 59,697 There was no allocation established in the allowance for loan losses relating to PCI loans at September 30, 2015 or December 31, 2014. The changes in accretable yield during the nine months ended September 30, 2015 in regard to loans transferred at acquisition for which it was probable that all contractually required payments would not be collected are presented in the table below. Activity in accretable yield for the nine months ended September 30, 2014 was not material. Balance at January 1, 2015 $ 2,546 Additions — Accretion (791 ) Transfers from nonaccretable 748 Balance at September 30, 2015 $ 2,503

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Financial Instruments with Off-Balance Sheet Risk The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. The commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the balance sheet. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of this instrument. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. At September 30, 2015 and December 31, 2014 , the approximate amounts of these financial instruments were as follows: September 30, December 31, 2015 2014 Commitments to extend credit $ 720,277 $ 565,881 Standby letters of credit 7,322 8,571 $ 727,599 $ 574,452 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained if deemed necessary by the Company upon extension of credit is based on management’s credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, farm crops, property, plant and equipment and income-producing commercial properties. Letters of credit are written conditional commitments used by the Company to guarantee the performance of a customer to a third party. The Company’s policies generally require that letter of credit arrangements contain security and debt covenants similar to those contained in loan arrangements. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount shown in the table above. If the commitment is funded, the Company would be entitled to seek recovery from the customer. As of September 30, 2015 and December 31, 2014 , no amounts have been recorded as liabilities for the Company’s potential obligations under these guarantees. Litigation The Company is involved in certain legal actions arising from normal business activities. Management believes that the outcome of such proceedings will not materially affect the financial position, results of operations or cash flows of the Company. Independent Bank is a party to a legal proceeding inherited by Independent Bank in connection with its acquisition of BOH Holdings, Inc. and its subsidiary, Bank of Houston. Please see Part II, Item 1. for more details on this lawsuit. Lease Commitments The Company leases certain branch facilities and other facilities. Rent expense related to these leases amounted to $ 583 and $1,567 for the three and nine months ended September 30, 2015, respectively, and $ 391 and $907 for the three and nine months ended September 30, 2014, respectively.

Repurchase Agreements and Other

Repurchase Agreements and Other Borrowings	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Repurchase Agreements and Other Borrowings	Repurchase Agreements and Other Borrowings At September 30, 2015 and December 31, 2014, repurchase agreements totaled $0 and $4,012 , respectively. During the three months ended September 30, 2015, repurchase agreements were transferred to deposit accounts. Other borrowings, including those borrowings due to related parties totaled $71,139 and $72,730 at September 30, 2015 and December 31, 2014, respectively. Scheduled principal payments of $625 , $341 and $625 were made on January 15, 2015, April 15, 2015 and July 15, 2015, respectively, for subordinated debentures issued to individuals. Line of Credit Renewal On July 22, 2015, the Company renewed its unsecured line of credit with two unrelated commercial banks and increased the line from $35 million to $50 million . The line bears interest at LIBOR plus 2.50% and matures on July 19, 2016. At September 30, 2015 and December 31, 2014, there were no advances outstanding on this line.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense for the three and nine months ended September 30, 2015 and 2014 was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Income tax expense for the period $ 3,924 $ 4,543 $ 13,664 $ 9,564 Effective tax rate 32.4 % 33.6 % 32.6 % 33.6 % The effective tax rates differ from the statutory federal tax rate of 35% largely due to tax exempt interest income earned on certain investment securities and loans and the nontaxable earnings on bank owned life insurance.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes 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 Topic 820, Fair Value Measurements and Disclosures , 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 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 Inputs – Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. The following table represents assets reported on the consolidated balance sheets at their fair value on a recurring basis as of September 30, 2015 and December 31, 2014 by level within the ASC Topic 820 fair value measurement hierarchy: Fair Value Measurements at Reporting Date Using Assets/ Liabilities Measured at Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2015 Measured on a recurring basis: Assets: Investment securities available for sale: U.S. treasuries $ 1,006 $ — $ 1,006 $ — Government agency securities 81,314 — 81,314 — Obligations of state and municipal subdivisions 71,080 — 71,080 — Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 46,788 — 46,788 — December 31, 2014 Measured on a recurring basis: Assets: Investment securities available for sale: U.S. treasuries $ 1,006 $ — $ 1,006 $ — Government agency securities 58,023 — 58,023 — Obligations of state and municipal subdivisions 76,899 — 76,899 — Corporate bonds 1,081 — 1,081 — Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 69,053 — 69,053 — There were no transfers between level categorizations and no changes in valuation methodologies for the periods presented. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. Securities classified as available for sale are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains 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 and other yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the security’s terms and conditions, among other things. In accordance with ASC Topic 820, certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the assets and liabilities 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). The following table presents the assets carried on the consolidated balance sheet by caption and by level in the fair value hierarchy at September 30, 2015 and December 31, 2014, for which a nonrecurring change in fair value has been recorded: Fair Value Measurements at Reporting Date Using Assets Measured at Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Period Ended Total Losses September 30, 2015 Measured on a nonrecurring basis: Assets: Impaired loans $ 1,992 $ — $ — $ 1,992 $ 2,380 Other real estate 577 — — 577 35 December 31, 2014 Measured on a nonrecurring basis: Assets: Impaired loans $ 4,943 $ — $ — $ 4,943 $ 188 Other real estate 138 — — 138 22 Impaired loans (loans which are not expected to repay all principal and interest amounts due in accordance with the original contractual terms) are measured at an observable market price (if available) or at the fair value of the loan’s collateral (if collateral dependent). Fair value of the loan’s collateral is determined by appraisals or independent valuation, which is then adjusted for the estimated costs related to liquidation of the collateral. Management’s ongoing review of appraisal information may result in additional discounts or adjustments to valuation based upon more recent market sales activity or more current appraisal information derived from properties of similar type and/or locale. Therefore, the Company has categorized its impaired loans as Level 3. The Company has no nonfinancial assets or nonfinancial liabilities measured at fair value on a recurring basis. Other real estate is measured at fair value on a nonrecurring basis (upon initial recognition or subsequent impairment). Other real estate is classified within Level 3 of the valuation hierarchy. When transferred from the loan portfolio, other real estate is adjusted to fair value less estimated selling costs and is subsequently carried at the lower of carrying value or fair value less estimated selling costs. The fair value is determined using an external appraisal process, discounted based on internal criteria. In addition, mortgage loans held for sale are required to be measured at the lower of cost or fair value. The fair value of mortgage loans held for sale is based upon binding quotes or bids from third party investors. As of September 30, 2015 and December 31, 2014, all mortgage loans held for sale were recorded at cost. The methods and assumptions used by the Company in estimating fair values of financial instruments as disclosed herein in accordance with ASC Topic 825, Financial Instruments , other than for those measured at fair value on a recurring and nonrecurring basis discussed above, are as follows: Cash and cash equivalents: The carrying amounts of cash and cash equivalents approximate their fair value. Loans and loans held for sale: For variable-rate loans that reprice frequently and have no significant changes in credit risk, fair values are based on carrying values. Fair values for certain mortgage loans (for example, one-to-four family residential), commercial real estate and commercial loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Federal Home Loan Bank of Dallas and other restricted stock: The carrying value of restricted securities such as stock in the Federal Home Loan Bank of Dallas and Independent Bankers Financial Corporation approximates fair value. Deposits: The fair values disclosed for demand deposits are, by definition, equal to the amount payable on demand at the reporting date (that is their carrying amounts). The carrying amounts of variable-rate certificates of deposit (CDs) approximate their fair values at the reporting date. Fair values for fixed-rate CDs are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits. Federal Home Loan Bank advances, line of credit and federal funds purchased: The fair value of advances maturing within 90 days approximates carrying value. Fair value of other advances is based on the Company’s current borrowing rate for similar arrangements. Repurchase agreements and other borrowings: The carrying value of repurchase agreements approximates fair value due to the short term nature. The fair values of private subordinated debentures are based upon prevailing rates on similar debt in the market place. The subordinated notes that are publicly traded are valued based on indicative bid prices based upon market pricing observations in the current market. Junior subordinated debentures: The fair value of junior subordinated debentures is estimated using discounted cash flow analyses based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements. Accrued interest: The carrying amounts of accrued interest approximate their fair values. Off-balance sheet instruments: Fair values for off-balance sheet, credit-related financial instruments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties' credit standing. The fair value of commitments is not material. The carrying amount, estimated fair value and the level of the fair value hierarchy of the Company’s financial instruments were as follows at September 30, 2015 and December 31, 2014: Fair Value Measurements at Reporting Date Using Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2015 Financial assets: Cash and cash equivalents $ 353,950 $ 353,950 $ 353,950 $ — $ — Securities available for sale 200,188 200,188 — 200,188 — Loans held for sale 6,218 6,218 — 6,218 — Loans, net 3,503,081 3,511,799 — 3,508,718 3,081 FHLB of Dallas stock and other restricted stock 13,187 13,187 — 13,187 — Accrued interest receivable 9,046 9,046 — 9,046 — Financial liabilities: Deposits 3,534,040 3,536,984 — 3,536,984 — Accrued interest payable 1,791 1,791 — 1,791 — FHLB advances 263,346 270,994 — 270,994 — Other borrowings 71,139 72,967 — 72,967 — Junior subordinated debentures 18,147 18,126 — 18,126 — Off-balance sheet assets (liabilities): Commitments to extend credit — — — — — Standby letters of credit — — — — — December 31, 2014 Financial assets: Cash and cash equivalents $ 324,047 $ 324,047 $ 324,047 $ — $ — Securities available for sale 206,062 206,062 — 206,062 — Loans held for sale 4,453 4,453 — 4,453 — Loans, net 3,182,045 3,203,337 — 3,200,261 3,076 FHLB of Dallas stock and other restricted stock 12,321 12,321 — 12,321 — Accrued interest receivable 9,655 9,655 — 9,655 — Financial liabilities: Deposits 3,249,598 3,252,114 — 3,252,114 — Accrued interest payable 2,919 2,919 — 2,919 — FHLB advances 229,405 228,607 — 228,607 — Repurchase agreements 4,012 4,012 — 4,012 — Other borrowings 72,730 75,164 — 75,164 — Junior subordinated debentures 18,147 18,134 — 18,134 — Off-balance sheet assets (liabilities): Commitments to extend credit — — — — — Standby letters of credit — — — — —

Stock Awards and Stock Warrants

Stock Awards and Stock Warrants	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Awards and Stock Warrants	Stock Awards and Stock Warrants The Company grants common stock awards to certain employees of the Company. The common stock issued prior to 2013 vests five years from the date the award is granted and the related compensation expense is recognized over the vesting period. In connection with the initial public offering in April 2013, the Board of Directors adopted a new 2013 Equity Incentive Plan. Under this plan, the Compensation Committee may grant awards in the form of restricted stock, restricted stock rights, restricted stock units, qualified and nonqualified stock options, performance-based share awards and other equity-based awards. The Plan reserved 800,000 shares of common stock to be awarded by the Company’s compensation committee. The shares currently issued under the 2013 Plan are restricted and will vest evenly over the required employment period, generally ranging from three to five years. Shares granted under a previous plan prior to 2012 and those in and subsequent to 2013 under the 2013 Equity Incentive Plan were issued at the date of grant and receive dividends. Shares issued under a revised plan in 2012 are not outstanding shares of the Company until they vest and do not receive dividends. The following table summarizes the activity in nonvested shares for the nine months ended September 30, 2015 and 2014 : Number of Shares Weighted Average Grant Date Fair Value Nonvested shares, December 31, 2014 373,886 $ 41.58 Granted during the period 90,124 31.84 Vested during the period (80,641 ) 42.12 Forfeited during the period (14,599 ) 28.82 Nonvested shares, September 30, 2015 368,770 $ 40.46 Nonvested shares, December 31, 2013 306,524 $ 22.75 Granted during the period 189,069 56.70 Vested during the period (121,364 ) 19.93 Forfeited during the period (1,194 ) 30.37 Nonvested shares, September 30, 2014 373,035 $ 40.85 Compensation expense related to these awards is recorded based on the fair value of the award at the date of grant and totaled $1,115 and $3,214 for the three and nine months ended September 30, 2015 , respectively and $841 and $2,011 for the three and nine months ended September 30, 2014, respectively. Compensation expense is recorded in salaries and employee benefits in the accompanying consolidated statements of income. At September 30, 2015 , future compensation expense is estimated to be $11,663 and will be recognized over a remaining weighted average period of 3.23 years. The fair value of common stock awards that vested during the nine months ended September 30, 2015 and 2014 was $3,192 and $6,288 , respectively. The Company has recorded $ (63) and $ 1,326 to additional paid in capital, which represents the income tax deficiency and excess tax benefit, respectively, recognized on the vested shares for the nine months ended September 30, 2015 and 2014, respectively. At September 30, 2015 , the future vesting schedule of the nonvested shares is as follows: First year 123,787 Second year 117,592 Third year 90,791 Fourth year 34,600 Fifth year 2,000 Total nonvested shares 368,770 The Company has warrants outstanding representing the right to purchase 150,544 shares of Company stock at $17.19 per share to certain Company directors and shareholders. The warrants were issued in return for the shareholders' agreement to repurchase the subordinated debt outstanding to an unaffiliated bank in the event of Company default. The subordinated debt was paid off by the Company in 2013. The warrants expire in December 2018.

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2015
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters Under banking law, there are legal restrictions limiting the amount of dividends the Bank can declare. Approval of the regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. For state banks, subject to regulatory capital requirements, payment of dividends is generally allowed to the extent of net profits. The Company (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. In July 2013, the Federal Reserve published final rules for the adoption of the Basel III regulatory capital framework (the "Basel III Capital Rules"). The Basel III Capital Rules, among other things, (i) introduce a new capital measure called "Common Equity Tier 1" ("CET1"), (ii) specify that Tier 1 capital consist of Common Equity Tier 1 and "Additional Tier 1 Capital" instruments meeting specified requirements, (iii) define Common Equity Tier 1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to Common Equity Tier 1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments as compared to existing regulations. The Basel III Capital Rules became effective for the Company on January 1, 2015 with certain transition provisions fully phased in on January 1, 2019. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total, CET1 and Tier 1 capital (as defined in the regulations) to risk weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of September 30, 2015 and December 31, 2014, the Company and the Bank meet all capital adequacy requirements to which they are subject. As of September 30, 2015 and December 31, 2014, the Bank’s capital ratios exceeded those levels necessary to be categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized," the Bank must maintain minimum total risk based, CET1, Tier 1 risk based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the Bank’s category. The actual capital amounts and ratios of the Company and Bank as of September 30, 2015 and December 31, 2014, are presented in the following table: Actual Minimum for Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio September 30, 2015 Total capital to risk weighted assets: Consolidated $ 443,245 11.86 % $ 299,064 8.00 % N/A N/A Bank 437,353 11.72 298,397 8.00 $ 372,996 10.00 % Tier 1 capital to risk weighted assets: Consolidated 350,224 9.37 224,298 6.00 N/A N/A Bank 412,265 11.05 223,798 6.00 298,397 8.00 % Common equity tier 1 to risk weighted assets Consolidated 308,686 8.26 168,224 4.50 N/A N/A Bank 412,265 11.05 167,848 4.50 242,447 6.50 % Tier 1 capital to average assets: Consolidated 350,224 8.67 161,513 4.00 N/A N/A Bank 412,265 10.21 161,453 4.00 201,817 5.00 % December 31, 2014 Total capital to risk weighted assets: Consolidated $ 402,326 12.59 % $ 255,633 8.00 % N/A N/A Bank 397,512 12.46 255,219 8.00 $ 319,024 10.00 % Tier 1 capital to risk weighted assets: Consolidated 314,136 9.83 127,817 4.00 N/A N/A Bank 378,960 11.88 127,609 4.00 191,414 6.00 % Tier 1 capital to average assets: Consolidated 314,136 8.15 154,270 4.00 N/A N/A Bank 378,960 9.93 152,598 4.00 190,747 5.00 %

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Business Combinations	Business Combinations BOH Holdings During the nine months ended September 30, 2015, the Company made measurement-period adjustments to previously-reported acquisition accounting estimates for the April 15, 2014 acquisition of BOH Holdings. Additional termination accruals were identified that related to BOH accounts that existed prior to the acquisition and resulted in increases of $118 to goodwill and $63 to deferred tax asset and a decrease of $181 to other liabilities. The measurement period for the BOH Holdings acquisition ended April 15, 2015. Houston Community Bancshares During the nine months ended September 30, 2015, the Company made measurement-period adjustments to previously-reported acquisition accounting estimates for the October 1, 2014 acquisition of Houston Community Bancshares (HCB). The adjustments related to the disposition of two other real estate owned properties and the writedown of one other real estate owned property due to a restriction on the property which the Company became aware of that affected the marketability. The adjustment resulted in increases of $243 to goodwill and $130 to deferred tax asset and a decrease to other real estate owned of $373 . The measurement period for the HCB acquisition ended October 1, 2015. Grand Bank On July 23, 2015, the Company announced that it has entered into a definitive agreement to acquire Grand Bank in Dallas, Texas for an approximate $80.1 million purchase price to be paid with a combination of cash and stock. The transaction is subject to certain conditions, including the approval by Grand Bank’s shareholders and customary regulatory approvals and is expected to close during the fourth quarter of 2015.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event Declaration of Dividends On October 30, 2015, the Company declared a quarterly cash dividend in the amount of $0.08 per share of common stock to the stockholders of record on November 9, 2015. The dividend will be paid on November 20, 2015.

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The accompanying consolidated financial statements include the accounts of IBG, its wholly-owned subsidiaries, the Bank and IBG Adriatica Holdings, Inc. (Adriatica) and the Bank’s wholly-owned subsidiaries, IBG Real Estate Holdings, Inc., IBG Aircraft Acquisition, Inc. and IBG Aircraft Company III. IBG Aircraft Company III was formed in the third quarter 2015 to hold the Company's new aircraft. Adriatica was formed in 2011 to acquire a mixed use residential and retail real estate development in McKinney, Texas. Adriatica became inactive during the first quarter of 2014. All material intercompany transactions and balances have been eliminated in consolidation. In addition, the Company wholly-owns IB Trust I (Trust I), IB Trust II (Trust II), IB Trust III (Trust III), IB Centex Trust I (Centex Trust I) and Community Group Statutory Trust I (CGI Trust I). The Trusts were formed to issue trust preferred securities and do not meet the criteria for consolidation. The consolidated interim financial statements are unaudited, but include all adjustments, which, in the opinion of management, are necessary for a fair presentation of the results of the periods presented. All such adjustments were of a normal and recurring nature. These financial statements should be read in conjunction with the financial statements and the notes thereto in the Company's Annual Report of Form10-K for the year ended December 31, 2014. The consolidated statement of condition at December 31, 2014 had been derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.
Segment Reporting	Segment Reporting: The Company has one reportable segment. The Company’s chief operating decision-maker uses consolidated results to make operating and strategic decisions.
Subsequent Events	Subsequent events: Companies are required to evaluate events and transactions that occur after the balance sheet date but before the date the financial statements are issued. They must recognize in the financial statements the effect of all events or transactions that provide additional evidence of conditions that existed at the balance sheet date, including the estimates inherent in the financial statement preparation process. Entities shall not recognize the impact of events or transactions that provide evidence about conditions that did not exist at the balance sheet date but arose after that date. The Company has evaluated subsequent events through the date of filing these financial statements with the Securities and Exchange Commission (SEC) and noted no subsequent events requiring financial statement recognition or disclosure, except as disclosed in Note 12.
Earnings Per Share	Earnings per share: Basic earnings per common share are net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. The unvested share-based payment awards that contain rights to non forfeitable dividends are considered participating securities for this calculation. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under stock warrants. The participating non vested common stock was not included in dulitive shares as it was anti-dilutive. Proceeds from the assumed exercise of dilutive stock warrants are assumed to be used to repurchase common stock at the average market price.
Allowance for Loan Losses	The allowance is derived from the following two components: 1) allowances established on individual impaired loans, which are based on a review of the individual characteristics of each loan, including the customer’s ability to repay the loan, the underlying collateral values, and the industry in which the customer operates, and 2) allowances based on actual historical loss experience for the last three years for similar types of loans in the Company’s loan portfolio adjusted for primarily changes in the lending policies and procedures; collection, charge-off and recovery practices; nature and volume of the loan portfolio; change in value of underlying collateral; volume and severity of nonperforming loans; existence and effect of any concentrations of credit and the level of such concentrations and current, national and local economic and business conditions. This second component also includes an unallocated allowance to cover uncertainties that could affect management’s estimate of probable losses. The unallocated allowance reflects the imprecision inherent in the underlying assumptions used in the methodologies for estimating this component. The Company’s management continually evaluates the allowance for loan losses determined from the allowances established on individual loans and the amounts determined from historical loss percentages adjusted for the qualitative factors above. Should any of the factors considered by management change, the Company’s estimate of loan losses could also change and would affect the level of future provision expense. While the calculation of the allowance for loan losses utilizes management’s best judgment and all the information available, the adequacy of the allowance for loan losses is dependent on a variety of factors beyond the Company’s control, including, among other things, the performance of the entire loan portfolio, the economy, changes in interest rates and the view of regulatory authorities towards loan classifications.
Nonaccrual Loan and Lease Status	The accrual of interest is discontinued on a loan when management believes after considering collection efforts and other factors that the borrower's financial condition is such that collection of interest is doubtful. All interest accrued but not collected for loans that are placed on nonaccrual status or charged-off is reversed against interest income. Cash collections on nonaccrual loans are generally credited to the loan receivable balance, and no interest income is recognized on those loans until the principal balance has been collected. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Impaired Loan and Lease Receivable	Impaired loans are those loans where it is probable that all amounts due will not be collected according to contractual terms of the loan agreement. The Company has identified these loans through its normal loan review procedures. Impaired loans are measured based on 1) the present value of expected future cash flows discounted at the loans effective interest rate; 2) the loan's observable market price; or 3) the fair value of collateral if the loan is collateral dependent. Substantially all of the Company’s impaired loans are measured at the fair value of the collateral. In limited cases, the Company may use the other methods to determine the level of impairment of a loan if such loan is not collateral dependent.
Loan Charge off Amounts	The Company will charge off that portion of any loan which management considers a loss. Commercial and real estate loans are generally considered for charge-off when exposure beyond collateral coverage is apparent and when no further collection of the loss portion is anticipated based on the borrower’s financial condition.
Troubled Debt Restructuring	The restructuring of a loan is considered a “troubled debt restructuring” if both 1) the borrower is experiencing financial difficulties and 2) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, principal forgiveness, extending amortization and other actions intended to minimize potential losses. A “troubled debt restructured” loan is identified as impaired and measured for credit impairment as of each reporting period in accordance with the guidance in Accounting Standards Codification (ASC) 310-10-35.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Earning Per Share	Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Basic earnings per share: Net income $ 8,202 $ 8,960 $ 28,225 $ 18,880 Less: Preferred stock dividends (60 ) (60 ) (180 ) (109 ) Net income after preferred stock dividends 8,142 8,900 28,045 18,771 Less: Undistributed earnings allocated to participating securities 131 157 492 291 Dividends paid on participating securities 27 19 84 49 Net income available to common shareholders $ 7,984 $ 8,724 $ 27,469 $ 18,431 Weighted-average basic shares outstanding 16,778,405 16,046,935 16,753,526 14,657,873 Basic earnings per share $ 0.48 $ 0.54 $ 1.64 $ 1.26 Diluted earnings per share: Net income available to common shareholders $ 7,984 $ 8,724 $ 27,469 $ 18,431 Total weighted-average basic shares outstanding 16,778,405 16,046,935 16,753,526 14,657,873 Add dilutive stock warrants 89,191 98,725 85,161 100,595 Total weighted-average diluted shares outstanding 16,867,596 16,145,660 16,838,687 14,758,468 Diluted earnings per share $ 0.47 $ 0.54 $ 1.63 $ 1.25 Anti-dilutive participating securities 50,770 73,120 55,802 122,209

Statement of Cash Flows (Tables

Statement of Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Other Supplemental Cash Flow Information	Other supplemental cash flow information is presented below: Nine Months Ended September 30, 2015 2014 Cash transactions: Interest expense paid $ 15,794 $ 10,222 Income taxes paid $ 16,600 $ 7,730 Noncash transactions: Accrued preferred stock dividends $ 60 $ 60 Transfers of loans to other real estate owned $ 221 $ 1,088 Loans to facilitate the sale of other real estate owned $ 159 $ 48 Securities purchased, not yet settled $ 12,880 $ — Excess tax benefit (tax deficiency) on restricted stock vested $ (63 ) $ 1,326 Transfer of bank premises to other real estate $ — $ 356 Transfer of repurchase agreements to deposits $ 4,012 $ — The supplemental schedule of noncash investing activities from Company acquisition activity is as follows: Nine Months Ended September 30, 2015 2014 Assets acquired Cash and cash equivalents $ — $ 167,771 Securities available for sale — 75,881 Loans — 856,899 Premises and equipment — 9,811 Other real estate owned — 1,224 Goodwill — 172,151 Core deposit intangibles — 8,147 Other assets — 27,804 Total assets $ — $ 1,319,688 Liabilities assumed: Deposits $ — $ 925,762 Repurchase agreements — 3,733 FHLB advances — 95,000 Other liabilities — 6,728 Total liabilities $ — $ 1,031,223 Cash paid to shareholders of acquired banks $ — $ 44,010 Series A preferred stock exchanged in connection with acquired bank $ — $ 23,938 Fair value of common stock issued to shareholders of acquired banks $ — $ 220,517 In addition, the following measurement-period adjustments were made during the period relating to Company acquisition activity: Nine Months Ended September 30, 2015 2014 Assets acquired: Loans $ — $ (328 ) Goodwill 361 752 Other real estate owned (373 ) — Core deposit intangibles — (18 ) Deferred tax asset 193 109 Other assets — 10 Total assets $ 181 $ 525 Liabilities assumed: Deposits $ — $ 505 Other liabilities 181 20 Total liabilities $ 181 $ 525

Securities Available for Sale (

Securities Available for Sale (Tables)	9 Months Ended
	Sep. 30, 2015
Available-for-sale Securities [Abstract]
Amortized Cost of Securities and Approximate Fair Values	The amortized cost of securities and their approximate fair values at September 30, 2015 and December 31, 2014, are as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities Available for Sale September 30, 2015: U.S. treasuries $ 1,000 $ 6 $ — $ 1,006 Government agency securities 80,905 445 (36 ) 81,314 Obligations of state and municipal subdivisions 69,510 1,875 (305 ) 71,080 Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 45,280 1,509 (1 ) 46,788 $ 196,695 $ 3,835 $ (342 ) $ 200,188 December 31, 2014: U.S. treasuries $ 999 $ 7 $ — $ 1,006 Government agency securities 58,174 199 (350 ) 58,023 Obligations of state and municipal subdivisions 75,599 1,837 (537 ) 76,899 Corporate bonds 1,068 13 — 1,081 Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 67,437 1,616 — 69,053 $ 203,277 $ 3,672 $ (887 ) $ 206,062
Schedule of Realized Gain (Loss)	Proceeds from sale of securities available for sale and gross gains and gross losses for the three and nine months ended September 30, 2015 and 2014 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Proceeds from sale — — 12,128 — Gross gains — — 90 — Gross losses — — — —
Amortized Cost and Estimated Fair Value of Securities Available for Sale by Contractual Maturity	The amortized cost and estimated fair value of securities available for sale at September 30, 2015 , by contractual maturity, are shown below. Maturities of pass-through certificates will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2015 Securities Available for Sale Amortized Cost Fair Value Due in one year or less $ 5,394 $ 5,423 Due from one year to five years 80,718 81,047 Due from five to ten years 29,737 30,124 Thereafter 35,566 36,806 151,415 153,400 Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 45,280 46,788 $ 196,695 $ 200,188
Summary of Unrealized Losses and Fair Value Securities in Continuous Unrealized Loss Position	The number of securities, unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of September 30, 2015 and December 31, 2014, are summarized as follows: Less Than 12 Months Greater Than 12 Months Total Description of Securities Number of Securities Estimated Fair Value Unrealized Losses Number of Securities Estimated Fair Value Unrealized Losses Estimated Fair Value Unrealized Losses Securities Available for Sale September 30, 2015 Government agency securities 1 $ 2,999 $ (1 ) 9 $ 14,965 $ (35 ) $ 17,964 $ (36 ) Obligations of state and municipal subdivisions 24 9,522 (56 ) 21 10,043 (249 ) 19,565 (305 ) Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 1 91 (1 ) — — — 91 (1 ) 26 $ 12,612 $ (58 ) 30 $ 25,008 $ (284 ) $ 37,620 $ (342 ) December 31, 2014 Government agency securities 6 $ 6,396 $ (24 ) 14 $ 22,671 $ (326 ) $ 29,067 $ (350 ) Obligations of state and municipal subdivisions 44 16,636 (197 ) 13 8,541 (340 ) 25,177 (537 ) 50 $ 23,032 $ (221 ) 27 $ 31,212 $ (666 ) $ 54,244 $ (887 )

Loans, Net and Allowance for 25

Loans, Net and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Compositions of Loans	Loans, net at September 30, 2015 and December 31, 2014, consisted of the following: September 30, December 31, 2015 2014 Commercial $ 668,001 $ 672,052 Real estate: Commercial 1,777,401 1,450,434 Commercial construction, land and land development 324,007 334,964 Residential 549,733 514,025 Single family interim construction 140,144 138,278 Agricultural 37,207 38,822 Consumer 32,621 52,267 Other 161 242 3,529,275 3,201,084 Deferred loan fees (1,106 ) (487 ) Allowance for loan losses (25,088 ) (18,552 ) $ 3,503,081 $ 3,182,045
Summary of Activity in Allowance for Loan Losses by Loan Class	The following is a summary of the activity in the allowance for loan losses by loan class for the three and nine months ended September 30, 2015 and 2014 : Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Unallocated Total Three months ended September 30, 2015 Balance at the beginning of period $ 6,632 $ 11,720 $ 2,318 $ 738 $ 234 $ 181 $ — $ (59 ) $ 21,764 Provision for loan losses 3,866 318 (91 ) (19 ) (17 ) 48 — (173 ) 3,932 Charge-offs (500 ) (69 ) (9 ) — — (65 ) — — (643 ) Recoveries 17 7 1 — — 10 — — 35 Balance at end of period $ 10,015 $ 11,976 $ 2,219 $ 719 $ 217 $ 174 $ — $ (232 ) $ 25,088 Nine months ended September 30, 2015 Balance at the beginning of period $ 5,051 $ 10,110 $ 2,205 $ 669 $ 246 $ 146 $ — $ 125 $ 18,552 Provision for loan losses 5,547 1,898 18 50 (29 ) 134 — (357 ) 7,261 Charge-offs (606 ) (69 ) (9 ) — — (142 ) — — (826 ) Recoveries 23 37 5 — — 36 — — 101 Balance at end of period $ 10,015 $ 11,976 $ 2,219 $ 719 $ 217 $ 174 $ — $ (232 ) $ 25,088 Three months ended September 30, 2014 Balance at the beginning of period $ 3,676 $ 9,100 $ 2,291 $ 584 $ 272 $ 349 $ — $ (53 ) $ 16,219 Provision for loan losses 427 706 4 (26 ) 21 (109 ) — (47 ) 976 Charge-offs — (318 ) — — — (76 ) — — (394 ) Recoveries 6 23 3 — — 7 — — 39 Balance at end of period $ 4,109 $ 9,511 $ 2,298 $ 558 $ 293 $ 171 $ — $ (100 ) $ 16,840 Nine months ended September 30, 2014 Balance at the beginning of period $ 2,401 $ 7,872 $ 2,440 $ 577 $ 238 $ 363 $ — $ 69 $ 13,960 Provision for loan losses 2,061 1,907 (117 ) (30 ) 55 (99 ) — (169 ) 3,608 Charge-offs (368 ) (339 ) (32 ) — — (118 ) — — (857 ) Recoveries 15 71 7 11 — 25 — — 129 Balance at end of period $ 4,109 $ 9,511 $ 2,298 $ 558 $ 293 $ 171 $ — $ (100 ) $ 16,840 The following table details the amount of the allowance for loan losses and recorded investment in loans by class as of September 30, 2015 and December 31, 2014: Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Unallocated Total September 30, 2015 Allowance for losses: Individually evaluated for impairment $ 2,481 $ 64 $ — $ — $ — $ 9 $ — $ — $ 2,554 Collectively evaluated for impairment 7,534 11,912 2,219 719 217 165 — (232 ) 22,534 Loans acquired with deteriorated credit quality — — — — — — — — — Ending balance $ 10,015 $ 11,976 $ 2,219 $ 719 $ 217 $ 174 $ — $ (232 ) $ 25,088 Loans: Individually evaluated for impairment $ 4,317 $ 5,302 $ 3,083 $ — $ — $ 119 $ — $ — $ 12,821 Collectively evaluated for impairment 660,726 2,050,554 545,420 140,144 37,207 32,480 161 — 3,466,692 Acquired with deteriorated credit quality 2,958 45,552 1,230 — — 22 — — 49,762 Ending balance $ 668,001 $ 2,101,408 $ 549,733 $ 140,144 $ 37,207 $ 32,621 $ 161 $ — $ 3,529,275 December 31, 2014 Allowance for losses: Individually evaluated for impairment $ 339 $ 124 $ 8 $ — $ — $ 4 $ — $ — $ 475 Collectively evaluated for impairment 4,712 9,986 2,197 669 246 142 — 125 18,077 Loans acquired with deteriorated credit quality — — — — — — — — — Ending balance $ 5,051 $ 10,110 $ 2,205 $ 669 $ 246 $ 146 $ — $ 125 $ 18,552 Loans: Individually evaluated for impairment $ 1,479 $ 6,768 $ 3,387 $ — $ — $ 75 $ — $ — $ 11,709 Collectively evaluated for impairment 666,830 1,724,514 508,833 138,278 38,822 52,159 242 — 3,129,678 Acquired with deteriorated credit quality 3,743 54,116 1,805 — — 33 — — 59,697 Ending balance $ 672,052 $ 1,785,398 $ 514,025 $ 138,278 $ 38,822 $ 52,267 $ 242 $ — $ 3,201,084
Summary of Nonperforming Loans by Loan Class	Nonperforming loans by loan class at September 30, 2015 and December 31, 2014, are summarized as follows: Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Total September 30, 2015 Nonaccrual loans $ 4,297 $ 32 $ 496 $ — $ — $ 119 $ — $ 4,944 Loans past due 90 days and still accruing 16 — 95 — — — — 111 Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing) 20 4,061 2,576 — — — — 6,657 $ 4,333 $ 4,093 $ 3,167 $ — $ — $ 119 $ — $ 11,712 December 31, 2014 Nonaccrual loans $ 1,449 $ 70 $ 2,117 $ — $ — $ 67 $ — $ 3,703 Loans past due 90 days and still accruing 157 288 — — — 6 — 451 Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing) 30 4,668 1,254 — — 8 — 5,960 $ 1,636 $ 5,026 $ 3,371 $ — $ — $ 81 $ — $ 10,114
Impaired Loans by Loan Class	Impaired loans by loan class at September 30, 2015 and December 31, 2014, are summarized as follows: Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Total September 30, 2015 Recorded investment in impaired loans: Impaired loans with an allowance for loan losses $ 4,195 $ 1,417 $ — $ — $ — $ 23 $ — $ 5,635 Impaired loans with no allowance for loan losses 122 3,885 3,083 — — 96 — 7,186 Total $ 4,317 $ 5,302 $ 3,083 $ — $ — $ 119 $ — $ 12,821 Unpaid principal balance of impaired loans $ 4,322 $ 5,803 $ 3,175 $ — $ — $ 141 $ — $ 13,441 Allowance for loan losses on impaired loans $ 2,481 $ 64 $ — $ — $ — $ 9 $ — $ 2,554 December 31, 2014 Recorded investment in impaired loans: Impaired loans with an allowance for loan losses $ 1,475 $ 2,056 $ 13 $ — $ — $ 7 $ — $ 3,551 Impaired loans with no allowance for loan losses 4 4,712 3,374 — — 68 — 8,158 Total $ 1,479 $ 6,768 $ 3,387 $ — $ — $ 75 $ — $ 11,709 Unpaid principal balance of impaired loans $ 1,482 $ 7,274 $ 3,605 $ — $ — $ 93 $ — $ 12,454 Allowance for loan losses on impaired loans $ 339 $ 124 $ 8 $ — $ — $ 4 $ — $ 475 For the three months ended September 30, 2015 Average recorded investment in impaired loans $ 4,997 $ 5,797 $ 3,182 $ — $ — $ 101 $ — $ 14,077 Interest income recognized on impaired loans $ — $ 88 $ 44 $ — $ — $ — $ — $ 132 For the nine months ended September 30, 2015 Average recorded investment in impaired loans $ 4,343 $ 6,212 $ 3,242 $ — $ — $ 88 $ — $ 13,885 Interest income recognized on impaired loans $ 48 $ 258 $ 136 $ — $ — $ 2 $ — $ 444 For the three months ended September 30, 2014 Average recorded investment in impaired loans $ 139 $ 7,538 $ 3,232 $ — $ — $ 73 $ — $ 10,982 Interest income recognized on impaired loans $ 2 $ 101 $ 44 $ — $ — $ 1 $ — $ 148 For the nine months ended September 30, 2014 Average recorded investment in impaired loans $ 257 $ 7,663 $ 3,219 $ 43 $ — $ 68 $ — $ 11,250 Interest income recognized on impaired loans $ 7 $ 302 $ 126 $ — $ — $ 2 $ — $ 437
Summary of Troubled Debt Restructurings	Following is a summary of loans modified under troubled debt restructurings during the three months ended September 30, 2015 and 2014 : . Commercial Commercial Real Estate, Land and Land Development Residential Real Estate Single-Family Interim Construction Agricultural Consumer Other Total Troubled debt restructurings during the three months ended September 30, 2015 Number of contracts — — — — — — — — Pre-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Post-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Troubled debt restructurings during the nine months ended September 30, 2015 Number of contracts — — — — — — — — Pre-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Post-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ — $ — $ — Troubled debt restructurings during the three months ended September 30, 2014 Number of contracts — — — — — 1 — 1 Pre-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ 9 $ — $ 9 Post-restructuring outstanding recorded investment $ — $ — $ — $ — $ — $ 9 $ — $ 9 Troubled debt restructurings during the nine months ended September 30, 2014 Number of contracts — 2 — — — — 1 3 Pre-restructuring outstanding recorded investment $ — $ 1,108 $ — $ — $ — $ — $ 9 $ 1,117 Post-restructuring outstanding recorded investment $ — $ 1,108 $ — $ — $ — $ — $ 9 $ 1,117
Aging of Past Due Loans by Loan Class	The following table presents information regarding the aging of past due loans by loan class as of September 30, 2015 and December 31, 2014: Loans 30-89 Days Past Due Loans 90 or More Past Due Total Past Due Loans Current Loans Total Loans September 30, 2015 Commercial $ 582 $ 4,294 $ 4,876 $ 663,125 $ 668,001 Commercial real estate, land and land development 2,380 — 2,380 2,099,028 2,101,408 Residential real estate 475 375 850 548,883 549,733 Single-family interim construction — — — 140,144 140,144 Agricultural 186 — 186 37,021 37,207 Consumer 143 26 169 32,452 32,621 Other — — — 161 161 $ 3,766 $ 4,695 $ 8,461 $ 3,520,814 $ 3,529,275 December 31, 2014 Commercial $ 6,006 $ 157 $ 6,163 $ 665,889 $ 672,052 Commercial real estate, land and land development 973 288 1,261 1,784,137 1,785,398 Residential real estate 1,258 554 1,812 512,213 514,025 Single-family interim construction 410 — 410 137,868 138,278 Agricultural — — — 38,822 38,822 Consumer 1,899 8 1,907 50,360 52,267 Other — — — 242 242 $ 10,546 $ 1,007 $ 11,553 $ 3,189,531 $ 3,201,084
Summary of Loans by Credit Quality Indicator by Class	A summary of loans by credit quality indicator by class as of September 30, 2015 and December 31, 2014 , is as follows: Pass Pass/ Watch OAEM Substandard Doubtful Total September 30, 2015 Commercial $ 532,576 $ 78,006 $ 24,311 $ 33,108 $ — $ 668,001 Commercial real estate, construction, land and land development 2,077,651 10,635 2,749 10,373 — 2,101,408 Residential real estate 540,756 2,001 1,954 5,022 — 549,733 Single-family interim construction 140,144 — — — — 140,144 Agricultural 35,169 226 1,812 — — 37,207 Consumer 32,375 76 35 135 — 32,621 Other 161 — — — — 161 $ 3,358,832 $ 90,944 $ 30,861 $ 48,638 $ — $ 3,529,275 December 31, 2014 Commercial $ 647,894 $ 16,919 $ 977 $ 6,262 $ — $ 672,052 Commercial real estate, construction, land and land development 1,759,533 8,667 6,008 11,190 — 1,785,398 Residential real estate 505,920 2,188 325 5,592 — 514,025 Single-family interim construction 138,278 — — — — 138,278 Agricultural 38,422 57 — 343 — 38,822 Consumer 52,055 39 50 123 — 52,267 Other 242 — — — — 242 $ 3,142,344 $ 27,870 $ 7,360 $ 23,510 $ — $ 3,201,084
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period	The following table summarizes the outstanding balance and related carrying amount of purchased credit impaired loans by acquired bank as of the respective acquisition date for the acquisitions occurring in 2014: Acquisition Date October 1, 2014 April 15, 2014 January 1, 2014 Houston City Bancshares, Inc. BOH Holdings, Inc. Live Oak Financial Corp. Outstanding balance $ 12,021 $ 55,718 $ 3,583 Nonaccretable difference (1,240 ) (5,798 ) (519 ) Accretable yield (561 ) (2,579 ) (182 ) Carrying amount $ 10,220 $ 47,341 $ 2,882 The carrying amount of all acquired PCI loans included in the consolidated balance sheet and the related outstanding balance at September 30, 2015 and December 31, 2014, were as follows: September 30, 2015 December 31, 2014 Outstanding balance $ 57,648 $ 69,371 Carrying amount 49,762 59,697
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	The changes in accretable yield during the nine months ended September 30, 2015 in regard to loans transferred at acquisition for which it was probable that all contractually required payments would not be collected are presented in the table below. Activity in accretable yield for the nine months ended September 30, 2014 was not material. Balance at January 1, 2015 $ 2,546 Additions — Accretion (791 ) Transfers from nonaccretable 748 Balance at September 30, 2015 $ 2,503

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	At September 30, 2015 and December 31, 2014 , the approximate amounts of these financial instruments were as follows: September 30, December 31, 2015 2014 Commitments to extend credit $ 720,277 $ 565,881 Standby letters of credit 7,322 8,571 $ 727,599 $ 574,452

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense	Income tax expense for the three and nine months ended September 30, 2015 and 2014 was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Income tax expense for the period $ 3,924 $ 4,543 $ 13,664 $ 9,564 Effective tax rate 32.4 % 33.6 % 32.6 % 33.6 %

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Assets at Fair Value on Recurring Basis	The following table represents assets reported on the consolidated balance sheets at their fair value on a recurring basis as of September 30, 2015 and December 31, 2014 by level within the ASC Topic 820 fair value measurement hierarchy: Fair Value Measurements at Reporting Date Using Assets/ Liabilities Measured at Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2015 Measured on a recurring basis: Assets: Investment securities available for sale: U.S. treasuries $ 1,006 $ — $ 1,006 $ — Government agency securities 81,314 — 81,314 — Obligations of state and municipal subdivisions 71,080 — 71,080 — Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 46,788 — 46,788 — December 31, 2014 Measured on a recurring basis: Assets: Investment securities available for sale: U.S. treasuries $ 1,006 $ — $ 1,006 $ — Government agency securities 58,023 — 58,023 — Obligations of state and municipal subdivisions 76,899 — 76,899 — Corporate bonds 1,081 — 1,081 — Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR 69,053 — 69,053 —
Assets and Liabilities at Fair Value on Nonrecurring Basis	The following table presents the assets carried on the consolidated balance sheet by caption and by level in the fair value hierarchy at September 30, 2015 and December 31, 2014, for which a nonrecurring change in fair value has been recorded: Fair Value Measurements at Reporting Date Using Assets Measured at Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Period Ended Total Losses September 30, 2015 Measured on a nonrecurring basis: Assets: Impaired loans $ 1,992 $ — $ — $ 1,992 $ 2,380 Other real estate 577 — — 577 35 December 31, 2014 Measured on a nonrecurring basis: Assets: Impaired loans $ 4,943 $ — $ — $ 4,943 $ 188 Other real estate 138 — — 138 22
Carrying Amount and Estimated Fair Value of Financial Instruments	The carrying amount, estimated fair value and the level of the fair value hierarchy of the Company’s financial instruments were as follows at September 30, 2015 and December 31, 2014: Fair Value Measurements at Reporting Date Using Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2015 Financial assets: Cash and cash equivalents $ 353,950 $ 353,950 $ 353,950 $ — $ — Securities available for sale 200,188 200,188 — 200,188 — Loans held for sale 6,218 6,218 — 6,218 — Loans, net 3,503,081 3,511,799 — 3,508,718 3,081 FHLB of Dallas stock and other restricted stock 13,187 13,187 — 13,187 — Accrued interest receivable 9,046 9,046 — 9,046 — Financial liabilities: Deposits 3,534,040 3,536,984 — 3,536,984 — Accrued interest payable 1,791 1,791 — 1,791 — FHLB advances 263,346 270,994 — 270,994 — Other borrowings 71,139 72,967 — 72,967 — Junior subordinated debentures 18,147 18,126 — 18,126 — Off-balance sheet assets (liabilities): Commitments to extend credit — — — — — Standby letters of credit — — — — — December 31, 2014 Financial assets: Cash and cash equivalents $ 324,047 $ 324,047 $ 324,047 $ — $ — Securities available for sale 206,062 206,062 — 206,062 — Loans held for sale 4,453 4,453 — 4,453 — Loans, net 3,182,045 3,203,337 — 3,200,261 3,076 FHLB of Dallas stock and other restricted stock 12,321 12,321 — 12,321 — Accrued interest receivable 9,655 9,655 — 9,655 — Financial liabilities: Deposits 3,249,598 3,252,114 — 3,252,114 — Accrued interest payable 2,919 2,919 — 2,919 — FHLB advances 229,405 228,607 — 228,607 — Repurchase agreements 4,012 4,012 — 4,012 — Other borrowings 72,730 75,164 — 75,164 — Junior subordinated debentures 18,147 18,134 — 18,134 — Off-balance sheet assets (liabilities): Commitments to extend credit — — — — — Standby letters of credit — — — — —

Stock Awards and Stock Warran29

Stock Awards and Stock Warrants (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Nonvested Shares Activity	The following table summarizes the activity in nonvested shares for the nine months ended September 30, 2015 and 2014 : Number of Shares Weighted Average Grant Date Fair Value Nonvested shares, December 31, 2014 373,886 $ 41.58 Granted during the period 90,124 31.84 Vested during the period (80,641 ) 42.12 Forfeited during the period (14,599 ) 28.82 Nonvested shares, September 30, 2015 368,770 $ 40.46 Nonvested shares, December 31, 2013 306,524 $ 22.75 Granted during the period 189,069 56.70 Vested during the period (121,364 ) 19.93 Forfeited during the period (1,194 ) 30.37 Nonvested shares, September 30, 2014 373,035 $ 40.85
Schedule of Vesting of Restricted Stock Award	At September 30, 2015 , the future vesting schedule of the nonvested shares is as follows: First year 123,787 Second year 117,592 Third year 90,791 Fourth year 34,600 Fifth year 2,000 Total nonvested shares 368,770

Regulatory Matters (Tables)

Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2015
Regulated Operations [Abstract]
Schedule of Compliance with Regulatory Capital Requirements	The actual capital amounts and ratios of the Company and Bank as of September 30, 2015 and December 31, 2014, are presented in the following table: Actual Minimum for Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Amount Ratio Amount Ratio September 30, 2015 Total capital to risk weighted assets: Consolidated $ 443,245 11.86 % $ 299,064 8.00 % N/A N/A Bank 437,353 11.72 298,397 8.00 $ 372,996 10.00 % Tier 1 capital to risk weighted assets: Consolidated 350,224 9.37 224,298 6.00 N/A N/A Bank 412,265 11.05 223,798 6.00 298,397 8.00 % Common equity tier 1 to risk weighted assets Consolidated 308,686 8.26 168,224 4.50 N/A N/A Bank 412,265 11.05 167,848 4.50 242,447 6.50 % Tier 1 capital to average assets: Consolidated 350,224 8.67 161,513 4.00 N/A N/A Bank 412,265 10.21 161,453 4.00 201,817 5.00 % December 31, 2014 Total capital to risk weighted assets: Consolidated $ 402,326 12.59 % $ 255,633 8.00 % N/A N/A Bank 397,512 12.46 255,219 8.00 $ 319,024 10.00 % Tier 1 capital to risk weighted assets: Consolidated 314,136 9.83 127,817 4.00 N/A N/A Bank 378,960 11.88 127,609 4.00 191,414 6.00 % Tier 1 capital to average assets: Consolidated 314,136 8.15 154,270 4.00 N/A N/A Bank 378,960 9.93 152,598 4.00 190,747 5.00 %

Summary of Significant Accoun31

Summary of Significant Accounting Policies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015segment
Accounting Policies [Abstract]
Number of reportable segments (segment)	1

Summary of Significant Accoun32

Summary of Significant Accounting Policies - EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Net income	$ 8,202	$ 8,960	$ 28,225	$ 18,880
Less: Preferred stock dividends	(60)	(60)	(180)	(109)
Net income after preferred stock dividends	8,142	8,900	28,045	18,771
Undistributed earnings allocated to participating securities	131	157	492	291
Dividends paid on participating securities	27	19	84	49
Net income available to common shareholders	$ 7,984	$ 8,724	$ 27,469	$ 18,431
Weighted-average basic shares outstanding (shares)	16,778,405	16,046,935	16,753,526	14,657,873
Basic earnings per share (usd per share)	$ 0.48	$ 0.54	$ 1.64	$ 1.26
Add dilutive stock warrants (shares)	89,191	98,725	85,161	100,595
Total weighted-average diluted shares outstanding (shares)	16,867,596	16,145,660	16,838,687	14,758,468
Diluted earnings per share (usd per share)	$ 0.47	$ 0.54	$ 1.63	$ 1.25
Anti-dilutive participating securities (shares)	50,770	73,120	55,802	122,209

Statement of Cash Flows - Addit

Statement of Cash Flows - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash transactions:
Interest expense paid	$ 15,794	$ 10,222
Income taxes paid	16,600	7,730
Noncash transactions:
Transfers of loans to other real estate owned	221	1,088
Loans to facilitate the sale of other real estate owned	159	48
Securities purchased, not yet settled	12,880	0
Excess tax benefit (tax deficiency) on restricted stock vested	(63)	1,326
Transfer of bank premises to other real estate	0	356
Transfer of repurchase agreements to deposits	4,012	0
Series A Preferred Stock
Noncash transactions:
Dividends declared, not yet paid	$ 60	$ 60

Statement of Cash Flows - Nonca

Statement of Cash Flows - Noncash Investing Activities from Acquisitions and Branch Sale (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Assets acquired
Cash and cash equivalents	$ 0	$ 167,771
Securities available for sale	0	75,881
Loans	0	856,899
Premises and equipment	0	9,811
Other real estate owned	0	1,224
Goodwill	0	172,151
Core deposit intangibles	0	8,147
Other assets	0	27,804
Total assets	0	1,319,688
Liabilities assumed:
Deposits	0	925,762
Repurchase agreements	0	3,733
FHLB advances	0	95,000
Other liabilities	0	6,728
Total liabilities	0	1,031,223
Cash paid to shareholders of acquired banks	0	44,010
Fair value of common stock issued to shareholders of acquired banks	0	220,517
Series A Preferred Stock
Liabilities assumed:
Fair value of common stock issued to shareholders of acquired banks	$ 0	$ 23,938

Statement of Cash Flows - Measu

Statement of Cash Flows - Measurement-Period Adjustments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Assets acquired
Loans	$ 0	$ (328)
Goodwill	361	752
Other real estate owned	(373)	0
Core deposit intangibles	0	(18)
Deferred tax asset	193	109
Other assets	0	10
Total assets	181	525
Liabilities assumed:
Deposits	0	505
Other liabilities	181	20
Total liabilities	$ 181	$ 525

Securities Available for Sale -

Securities Available for Sale - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Carrying value of securities pledged	$ 135,981	$ 174,741

Securities Available for Sale-A

Securities Available for Sale-Amortized Cost of Securities and Approximate Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 196,695	$ 203,277
Gross Unrealized Gains	3,835	3,672
Gross Unrealized Losses	(342)	(887)
Fair Value	200,188	206,062
U.S. treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,000	999
Gross Unrealized Gains	6	7
Gross Unrealized Losses	0	0
Fair Value	1,006	1,006
Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	80,905	58,174
Gross Unrealized Gains	445	199
Gross Unrealized Losses	(36)	(350)
Fair Value	81,314	58,023
Obligations of state and municipal subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,510	75,599
Gross Unrealized Gains	1,875	1,837
Gross Unrealized Losses	(305)	(537)
Fair Value	71,080	76,899
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,068
Gross Unrealized Gains		13
Gross Unrealized Losses		0
Fair Value		1,081
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	45,280	67,437
Gross Unrealized Gains	1,509	1,616
Gross Unrealized Losses	(1)	0
Fair Value	$ 46,788	$ 69,053

Securities Available for Sale-P

Securities Available for Sale-Proceeds from Sale of Securities and Gross Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Available-for-sale Securities [Abstract]
Proceeds from sale	$ 0	$ 0	$ 12,128	$ 0
Gross gains	0	0	90	0
Gross losses	$ 0	$ 0	$ 0	$ 0

Securities Available for Sale39

Securities Available for Sale-Amortized Cost and Estimated Fair Value of Securities Available for Sale by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amortized Cost
Due in one year or less	$ 5,394
Due from one year to five years	80,718
Due from five to ten years	29,737
Thereafter	35,566
Total	151,415
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	45,280
Amortized Cost	196,695	$ 203,277
Fair Value
Due in one year or less	5,423
Due from one year to five years	81,047
Due from five to ten years	30,124
Thereafter	36,806
Total	153,400
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR	46,788
Fair Value	$ 200,188	$ 206,062

Securities Available for Sale-S

Securities Available for Sale-Summary of Unrealized Losses and Fair Value of Securities in Continuous Unrealized Loss Positions (Details) $ in Thousands	Sep. 30, 2015USD ($)security	Dec. 31, 2014USD ($)security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months | security	26	50
Less than 12 months: Estimated Fair Value	$ 12,612	$ 23,032
Less than 12 months: Unrealized Losses	$ (58)	$ (221)
Number of Securities, Greater than 12 Months | security	30	27
Greater Than 12 Months: Estimated Fair Value	$ 25,008	$ 31,212
Greater Than 12 Months: Unrealized Losses	(284)	(666)
Total: Estimated Fair Value	37,620	54,244
Total: Unrealized Losses	$ (342)	$ (887)
Government agency securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months | security	1	6
Less than 12 months: Estimated Fair Value	$ 2,999	$ 6,396
Less than 12 months: Unrealized Losses	$ (1)	$ (24)
Number of Securities, Greater than 12 Months | security	9	14
Greater Than 12 Months: Estimated Fair Value	$ 14,965	$ 22,671
Greater Than 12 Months: Unrealized Losses	(35)	(326)
Total: Estimated Fair Value	17,964	29,067
Total: Unrealized Losses	$ (36)	$ (350)
Obligations of state and municipal subdivisions
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months | security	24	44
Less than 12 months: Estimated Fair Value	$ 9,522	$ 16,636
Less than 12 months: Unrealized Losses	$ (56)	$ (197)
Number of Securities, Greater than 12 Months | security	21	13
Greater Than 12 Months: Estimated Fair Value	$ 10,043	$ 8,541
Greater Than 12 Months: Unrealized Losses	(249)	(340)
Total: Estimated Fair Value	19,565	25,177
Total: Unrealized Losses	$ (305)	$ (537)
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than 12 Months | security	1
Less than 12 months: Estimated Fair Value	$ 91
Less than 12 months: Unrealized Losses	$ (1)
Number of Securities, Greater than 12 Months | security	0
Greater Than 12 Months: Estimated Fair Value	$ 0
Greater Than 12 Months: Unrealized Losses	0
Total: Estimated Fair Value	91
Total: Unrealized Losses	$ (1)

Loans, Net and Allowance for 41

Loans, Net and Allowance for Loan Losses - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)component	Dec. 31, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 3,503,081	$ 3,182,045
Number of components allowance for loan losses is derived from | component	2
Recorded investment in troubled debt restructuring including nonaccraul	$ 6,669	7,302
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans requiring external review (greater than)	2,400
Commercial, E&P Energy Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 209,600	$ 231,700
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan to value ratio (percent)	80.00%
Loan, amortization period	20 years
Period of operating lines	1 year
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total loan portfolio (less than)	2.00%

Loans, Net and Allowance for 42

Loans, Net and Allowance for Loan Losses - Composition of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 3,529,275		$ 3,201,084
Deferred loan fees	(1,106)		(487)
Allowance for loan losses	(25,088)	$ (21,764)	(18,552)	$ (16,840)	$ (16,219)	$ (13,960)
Loans, net	3,503,081		3,182,045
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	668,001		672,052
Allowance for loan losses	(10,015)	(6,632)	(5,051)	(4,109)	(3,676)	(2,401)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,777,401		1,450,434
Commercial construction, land and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	324,007		334,964
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	549,733		514,025
Allowance for loan losses	(2,219)	(2,318)	(2,205)	(2,298)	(2,291)	(2,440)
Single-Family Interim Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	140,144		138,278
Allowance for loan losses	(719)	(738)	(669)	(558)	(584)	(577)
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	37,207		38,822
Allowance for loan losses	(217)	(234)	(246)	(293)	(272)	(238)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	32,621		52,267
Allowance for loan losses	(174)	(181)	(146)	(171)	(349)	(363)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	161		242
Allowance for loan losses	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

Loans, Net and Allowance for 43

Loans, Net and Allowance for Loan Losses - Rollforward of Activity in Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	$ 21,764	$ 16,219	$ 18,552	$ 13,960
Provision for loan losses	3,932	976	7,261	3,608
Charge-offs	(643)	(394)	(826)	(857)
Recoveries	35	39	101	129
Balance at end of period	25,088	16,840	25,088	16,840
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	6,632	3,676	5,051	2,401
Provision for loan losses	3,866	427	5,547	2,061
Charge-offs	(500)	0	(606)	(368)
Recoveries	17	6	23	15
Balance at end of period	10,015	4,109	10,015	4,109
Commercial Real Estate, Land and Land Development
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	11,720	9,100	10,110	7,872
Provision for loan losses	318	706	1,898	1,907
Charge-offs	(69)	(318)	(69)	(339)
Recoveries	7	23	37	71
Balance at end of period	11,976	9,511	11,976	9,511
Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	2,318	2,291	2,205	2,440
Provision for loan losses	(91)	4	18	(117)
Charge-offs	(9)	0	(9)	(32)
Recoveries	1	3	5	7
Balance at end of period	2,219	2,298	2,219	2,298
Single-Family Interim Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	738	584	669	577
Provision for loan losses	(19)	(26)	50	(30)
Charge-offs	0	0	0	0
Recoveries	0	0	0	11
Balance at end of period	719	558	719	558
Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	234	272	246	238
Provision for loan losses	(17)	21	(29)	55
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	217	293	217	293
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	181	349	146	363
Provision for loan losses	48	(109)	134	(99)
Charge-offs	(65)	(76)	(142)	(118)
Recoveries	10	7	36	25
Balance at end of period	174	171	174	171
Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	0	0	0	0
Provision for loan losses	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	0	0	0	0
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at the beginning of period	(59)	(53)	125	69
Provision for loan losses	(173)	(47)	(357)	(169)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	$ (232)	$ (100)	$ (232)	$ (100)

Loans, Net and Allowance for 44

Loans, Net and Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Allowance for losses:
Individually evaluated for impairment	$ 2,554		$ 475
Collectively evaluated for impairment	22,534		18,077
Ending balance	25,088	$ 21,764	18,552	$ 16,840	$ 16,219	$ 13,960
Loans:
Individually evaluated for impairment	12,821		11,709
Collectively evaluated for impairment	3,466,692		3,129,678
Ending balance	3,529,275		3,201,084
Commercial
Allowance for losses:
Individually evaluated for impairment	2,481		339
Collectively evaluated for impairment	7,534		4,712
Ending balance	10,015	6,632	5,051	4,109	3,676	2,401
Loans:
Individually evaluated for impairment	4,317		1,479
Collectively evaluated for impairment	660,726		666,830
Ending balance	668,001		672,052
Commercial Real Estate, Land and Land Development
Allowance for losses:
Individually evaluated for impairment	64		124
Collectively evaluated for impairment	11,912		9,986
Ending balance	11,976	11,720	10,110	9,511	9,100	7,872
Loans:
Individually evaluated for impairment	5,302		6,768
Collectively evaluated for impairment	2,050,554		1,724,514
Ending balance	2,101,408		1,785,398
Residential Real Estate
Allowance for losses:
Individually evaluated for impairment	0		8
Collectively evaluated for impairment	2,219		2,197
Ending balance	2,219	2,318	2,205	2,298	2,291	2,440
Loans:
Individually evaluated for impairment	3,083		3,387
Collectively evaluated for impairment	545,420		508,833
Ending balance	549,733		514,025
Single-Family Interim Construction
Allowance for losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	719		669
Ending balance	719	738	669	558	584	577
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	140,144		138,278
Ending balance	140,144		138,278
Agricultural
Allowance for losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	217		246
Ending balance	217	234	246	293	272	238
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	37,207		38,822
Ending balance	37,207		38,822
Consumer
Allowance for losses:
Individually evaluated for impairment	9		4
Collectively evaluated for impairment	165		142
Ending balance	174	181	146	171	349	363
Loans:
Individually evaluated for impairment	119		75
Collectively evaluated for impairment	32,480		52,159
Ending balance	32,621		52,267
Other
Allowance for losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	0		0
Ending balance	0	0	0	0	0	0
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	161		242
Ending balance	161		242
Unallocated
Allowance for losses:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	(232)		125
Ending balance	(232)	$ (59)	125	$ (100)	$ (53)	$ 69
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	0		0
Ending balance	0		0
Receivables Acquired with Deteriorated Credit Quality
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	49,762		59,697
Receivables Acquired with Deteriorated Credit Quality | Commercial
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	2,958		3,743
Receivables Acquired with Deteriorated Credit Quality | Commercial Real Estate, Land and Land Development
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	45,552		54,116
Receivables Acquired with Deteriorated Credit Quality | Residential Real Estate
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	1,230		1,805
Receivables Acquired with Deteriorated Credit Quality | Single-Family Interim Construction
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Receivables Acquired with Deteriorated Credit Quality | Agricultural
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Receivables Acquired with Deteriorated Credit Quality | Consumer
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	22		33
Receivables Acquired with Deteriorated Credit Quality | Other
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Receivables Acquired with Deteriorated Credit Quality | Unallocated
Allowance for losses:
Loans acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	$ 0		$ 0

Loans, Net and Allowance for 45

Loans, Net and Allowance for Loan Losses - Summary of Non Performing Loans by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 4,944	$ 3,703
Loans past due 90 days and still accruing	111	451
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	6,657	5,960
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	11,712	10,114
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	4,297	1,449
Loans past due 90 days and still accruing	16	157
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	20	30
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	4,333	1,636
Commercial Real Estate, Land and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	32	70
Loans past due 90 days and still accruing	0	288
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	4,061	4,668
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	4,093	5,026
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	496	2,117
Loans past due 90 days and still accruing	95	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	2,576	1,254
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	3,167	3,371
Single-Family Interim Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	0
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	0	0
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	0
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	119	67
Loans past due 90 days and still accruing	0	6
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	8
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	119	81
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Loans past due 90 days and still accruing	0	0
Troubled debt restructurings (not included in nonaccrual or loans past due and still accruing)	0	0
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest, Total	$ 0	$ 0

Loans, Net and Allowance for 46

Loans, Net and Allowance for Loan Losses - Impaired Loans by Loan Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	$ 5,635		$ 5,635		$ 3,551
Impaired loans with no allowance for loan losses	7,186		7,186		8,158
Total	12,821		12,821		11,709
Unpaid principal balance of impaired loans	13,441		13,441		12,454
Allowance for loan losses on impaired loans	2,554		2,554		475
Average recorded investment in impaired loans	14,077	$ 10,982	13,885	$ 11,250
Interest income recognized on impaired loans	132	148	444	437
Commercial
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	4,195		4,195		1,475
Impaired loans with no allowance for loan losses	122		122		4
Total	4,317		4,317		1,479
Unpaid principal balance of impaired loans	4,322		4,322		1,482
Allowance for loan losses on impaired loans	2,481		2,481		339
Average recorded investment in impaired loans	4,997	139	4,343	257
Interest income recognized on impaired loans	0	2	48	7
Commercial Real Estate, Land and Land Development
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	1,417		1,417		2,056
Impaired loans with no allowance for loan losses	3,885		3,885		4,712
Total	5,302		5,302		6,768
Unpaid principal balance of impaired loans	5,803		5,803		7,274
Allowance for loan losses on impaired loans	64		64		124
Average recorded investment in impaired loans	5,797	7,538	6,212	7,663
Interest income recognized on impaired loans	88	101	258	302
Residential Real Estate
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0		13
Impaired loans with no allowance for loan losses	3,083		3,083		3,374
Total	3,083		3,083		3,387
Unpaid principal balance of impaired loans	3,175		3,175		3,605
Allowance for loan losses on impaired loans	0		0		8
Average recorded investment in impaired loans	3,182	3,232	3,242	3,219
Interest income recognized on impaired loans	44	44	136	126
Single-Family Interim Construction
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0		0
Impaired loans with no allowance for loan losses	0		0		0
Total	0		0		0
Unpaid principal balance of impaired loans	0		0		0
Allowance for loan losses on impaired loans	0		0		0
Average recorded investment in impaired loans	0	0	0	43
Interest income recognized on impaired loans	0	0	0	0
Agricultural
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0		0
Impaired loans with no allowance for loan losses	0		0		0
Total	0		0		0
Unpaid principal balance of impaired loans	0		0		0
Allowance for loan losses on impaired loans	0		0		0
Average recorded investment in impaired loans	0	0	0	0
Interest income recognized on impaired loans	0	0	0	0
Consumer
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	23		23		7
Impaired loans with no allowance for loan losses	96		96		68
Total	119		119		75
Unpaid principal balance of impaired loans	141		141		93
Allowance for loan losses on impaired loans	9		9		4
Average recorded investment in impaired loans	101	73	88	68
Interest income recognized on impaired loans	0	1	2	2
Other
Recorded investment in impaired loans:
Impaired loans with an allowance for loan losses	0		0		0
Impaired loans with no allowance for loan losses	0		0		0
Total	0		0		0
Unpaid principal balance of impaired loans	0		0		0
Allowance for loan losses on impaired loans	0		0		$ 0
Average recorded investment in impaired loans	0	0	0	0
Interest income recognized on impaired loans	$ 0	$ 0	$ 0	$ 0

Loans, Net and Allowance for 47

Loans, Net and Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)contract	Sep. 30, 2014USD ($)contract	Sep. 30, 2015USD ($)contract	Sep. 30, 2014USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	1	0	3
Pre-restructuring outstanding recorded investment	$ 0	$ 9	$ 0	$ 1,117
Post-restructuring outstanding recorded investment	$ 0	$ 9	$ 0	$ 1,117
Commercial
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate, Land and Land Development
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	2
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 1,108
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 1,108
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Single-Family Interim Construction
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Agricultural
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	1	0	0
Pre-restructuring outstanding recorded investment	$ 0	$ 9	$ 0	$ 0
Post-restructuring outstanding recorded investment	$ 0	$ 9	$ 0	$ 0
Other Loan
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	1
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 9
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 9

Loans, Net and Allowance for 48

Loans, Net and Allowance for Loan Losses - Aging of Past Due Loans by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 8,461	$ 11,553
Current Loans	3,520,814	3,189,531
Ending balance	3,529,275	3,201,084
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,876	6,163
Current Loans	663,125	665,889
Ending balance	668,001	672,052
Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,380	1,261
Current Loans	2,099,028	1,784,137
Ending balance	2,101,408	1,785,398
Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	850	1,812
Current Loans	548,883	512,213
Ending balance	549,733	514,025
Single-Family Interim Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	410
Current Loans	140,144	137,868
Ending balance	140,144	138,278
Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	186	0
Current Loans	37,021	38,822
Ending balance	37,207	38,822
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	169	1,907
Current Loans	32,452	50,360
Ending balance	32,621	52,267
Other Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Current Loans	161	242
Ending balance	161	242
Loans 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	3,766	10,546
Loans 30-89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	582	6,006
Loans 30-89 Days Past Due | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	2,380	973
Loans 30-89 Days Past Due | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	475	1,258
Loans 30-89 Days Past Due | Single-Family Interim Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	410
Loans 30-89 Days Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	186	0
Loans 30-89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	143	1,899
Loans 30-89 Days Past Due | Other Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,695	1,007
Loans 90 or More Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	4,294	157
Loans 90 or More Past Due | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	288
Loans 90 or More Past Due | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	375	554
Loans 90 or More Past Due | Single-Family Interim Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Past Due | Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	0	0
Loans 90 or More Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	26	8
Loans 90 or More Past Due | Other Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due Loans	$ 0	$ 0

Loans, Net and Allowance for 49

Loans, Net and Allowance for Loan Losses - Summary of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 3,529,275	$ 3,201,084
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	668,001	672,052
Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	2,101,408	1,785,398
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	549,733	514,025
Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	140,144	138,278
Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	37,207	38,822
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	32,621	52,267
Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	161	242
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	3,358,832	3,142,344
Pass | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	532,576	647,894
Pass | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	2,077,651	1,759,533
Pass | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	540,756	505,920
Pass | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	140,144	138,278
Pass | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	35,169	38,422
Pass | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	32,375	52,055
Pass | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	161	242
Pass/ Watch
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	90,944	27,870
Pass/ Watch | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	78,006	16,919
Pass/ Watch | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	10,635	8,667
Pass/ Watch | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	2,001	2,188
Pass/ Watch | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Pass/ Watch | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	226	57
Pass/ Watch | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	76	39
Pass/ Watch | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	30,861	7,360
OAEM | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	24,311	977
OAEM | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	2,749	6,008
OAEM | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	1,954	325
OAEM | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
OAEM | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	1,812	0
OAEM | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	35	50
OAEM | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	48,638	23,510
Substandard | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	33,108	6,262
Substandard | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	10,373	11,190
Substandard | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	5,022	5,592
Substandard | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Substandard | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	343
Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	135	123
Substandard | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Commercial Real Estate, Land and Land Development
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Single-Family Interim Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	0	0
Doubtful | Other Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 0	$ 0

Loans, Net and Allowance for 50

Loans, Net and Allowance for Loan Losses - Outstanding Balance and Related Carrying Amount of Purchased Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Oct. 01, 2014	Apr. 15, 2014	Jan. 01, 2014
Business Acquisition [Line Items]
Outstanding balance	$ 57,648	$ 69,371
Carrying amount	$ 49,762	$ 59,697
Houston City Bancshares, Inc.
Business Acquisition [Line Items]
Outstanding balance			$ 12,021
Nonaccretable difference			(1,240)
Accretable yield			(561)
Carrying amount			$ 10,220
BOH Holdings, Inc.
Business Acquisition [Line Items]
Outstanding balance				$ 55,718
Nonaccretable difference				(5,798)
Accretable yield				(2,579)
Carrying amount				$ 47,341
Live Oak Financial Corp.
Business Acquisition [Line Items]
Outstanding balance					$ 3,583
Nonaccretable difference					(519)
Accretable yield					(182)
Carrying amount					$ 2,882

Loans, Net and Allowance for 51

Loans, Net and Allowance for Loan Losses - Purchased Credit Impaired Loans in Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Outstanding balance	$ 57,648	$ 69,371
Carrying amount	$ 49,762	$ 59,697

Loans, Net and Allowance for 52

Loans, Net and Allowance for Loan Losses - Accretable Yield Rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at January 1, 2015	$ 2,546
Additions	0
Accretion	(791)
Transfers from nonaccretable	748
Balance at September 30, 2015	$ 2,503

Commitments and Contingencies53

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	$ 727,599	$ 574,452
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	720,277	565,881
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	$ 7,322	$ 8,571

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 583	$ 391	$ 1,567	$ 907

Repurchase Agreements and Oth55

Repurchase Agreements and Other Borrowings (Details)	Jul. 22, 2015USD ($)bank	Jul. 15, 2015USD ($)	Apr. 15, 2015USD ($)	Jan. 15, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Jul. 21, 2015USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Repurchase agreements					$ 0			$ 4,012,000
Other borrowings and due to related parties					71,139,000			72,730,000
Repayments of subordinated debt		$ 625,000	$ 341,000	$ 625,000	1,591,000	$ 0
Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Long-term Line of Credit					$ 0			$ 0
Line of credit facility, number of unaffiliated banks | bank	2
Maximum borrowing capacity	$ 50,000,000						$ 35,000,000
Revolving credit facility | Line of credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%

Income Taxes - Tax Expense (Det

Income Taxes - Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense for the period	$ 3,924	$ 4,543	$ 13,664	$ 9,564
Effective tax rates (percent)	32.40%	33.60%	32.60%	33.60%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate (percent)	35.00%

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	$ 1,006	$ 1,006
Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	81,314	58,023
Obligations of state and municipal subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	71,080	76,899
Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	46,788	69,053
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis		1,081
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of state and municipal subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis		0
Significant Other Observable Inputs (Level 2) | U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	1,006	1,006
Significant Other Observable Inputs (Level 2) | Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	81,314	58,023
Significant Other Observable Inputs (Level 2) | Obligations of state and municipal subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	71,080	76,899
Significant Other Observable Inputs (Level 2) | Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	46,788	69,053
Significant Other Observable Inputs (Level 2) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis		1,081
Significant Unobservable Inputs (Level 3) | U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Obligations of state and municipal subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Residential pass-through securities guaranteed by FNMA, GNMA, FHLMC and FHR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis	$ 0	0
Significant Unobservable Inputs (Level 3) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale measured on a recurring basis		$ 0

Fair Value Measurements - Ass59

Fair Value Measurements - Assets and Liabilities at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	$ 1,992	$ 4,943
Period Ended Total Losses	2,380	188
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	577	138
Period Ended Total Losses	35	22
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	0	0
Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	1,992	4,943
Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, measured on a nonrecurring basis	$ 577	$ 138

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial assets:
Securities available for sale	$ 200,188	$ 206,062
Financial liabilities:
Repurchase agreements	0	4,012
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	727,599	574,452
Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	720,277	565,881
Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	7,322	8,571
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	353,950	324,047
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	0	0
FHLB of Dallas stock and other restricted stock	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Accrued interest payable	0	0
FHLB advances	0	0
Repurchase agreements		0
Other borrowings	0	0
Junior subordinated debentures	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale	200,188	206,062
Loans held for sale	6,218	4,453
Loans, net	3,508,718	3,200,261
FHLB of Dallas stock and other restricted stock	13,187	12,321
Accrued interest receivable	9,046	9,655
Financial liabilities:
Deposits	3,536,984	3,252,114
Accrued interest payable	1,791	2,919
FHLB advances	270,994	228,607
Repurchase agreements		4,012
Other borrowings	72,967	75,164
Junior subordinated debentures	18,126	18,134
Significant Other Observable Inputs (Level 2) | Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Significant Other Observable Inputs (Level 2) | Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale	0	0
Loans held for sale	0	0
Loans, net	3,081	3,076
FHLB of Dallas stock and other restricted stock	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Accrued interest payable	0	0
FHLB advances	0	0
Repurchase agreements		0
Other borrowings	0	0
Junior subordinated debentures	0	0
Significant Unobservable Inputs (Level 3) | Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Significant Unobservable Inputs (Level 3) | Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Carrying Amount
Financial assets:
Cash and cash equivalents	353,950	324,047
Securities available for sale	200,188	206,062
Loans held for sale	6,218	4,453
Loans, net	3,503,081	3,182,045
FHLB of Dallas stock and other restricted stock	13,187	12,321
Accrued interest receivable	9,046	9,655
Financial liabilities:
Deposits	3,534,040	3,249,598
Accrued interest payable	1,791	2,919
FHLB advances	263,346	229,405
Repurchase agreements		4,012
Other borrowings	71,139	72,730
Junior subordinated debentures	18,147	18,147
Carrying Amount | Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Carrying Amount | Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Estimated Fair Value
Financial assets:
Cash and cash equivalents	353,950	324,047
Securities available for sale	200,188	206,062
Loans held for sale	6,218	4,453
Loans, net	3,511,799	3,203,337
FHLB of Dallas stock and other restricted stock	13,187	12,321
Accrued interest receivable	9,046	9,655
Financial liabilities:
Deposits	3,536,984	3,252,114
Accrued interest payable	1,791	2,919
FHLB advances	270,994	228,607
Repurchase agreements		4,012
Other borrowings	72,967	75,164
Junior subordinated debentures	18,126	18,134
Estimated Fair Value | Commitments to extend credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	0	0
Estimated Fair Value | Standby letters of credit
Off-balance sheet assets (liabilities):
Financial instruments with off-balance sheet risk	$ 0	$ 0

Stock Awards and Stock Warran61

Stock Awards and Stock Warrants - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock vesting period					5 years
Compensation expense	$ 1,115	$ 841	$ 3,214	$ 2,011
Period for recognition			3 years 2 months 22 days
Estimated future compensation expense	$ 11,663		$ 11,663
Fair value of common stock awards vested			3,192	6,288
AOCI income tax effect from share-based compensation, net			$ (63)	$ 1,326
Issuance of warrant (shares)			150,544
Purchase price of common stock, per share (usd per share)			$ 17.19
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (shares)	800,000		800,000
Minimum | 2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock vesting period			3 years
Maximum | 2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock vesting period			5 years

Stock Awards and Stock Warran62

Stock Awards and Stock Warrants - Nonvested Shares Activity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Number of Shares
Nonvested shares, beginning balance (shares)	373,886	306,524
Granted during the period (shares)	90,124	189,069
Vested during the period (shares)	(80,641)	(121,364)
Forfeited during the period (shares)	(14,599)	(1,194)
Nonvested shares, ending balance (shares)	368,770	373,035
Weighted Average Grant Date Fair Value
Nonvested shares, beginning balance (usd per share)	$ 41.58	$ 22.75
Granted during the period (usd per share)	31.84	56.70
Vested during the period (usd per share)	42.12	19.93
Forfeited during the period (usd per share)	28.82	30.37
Nonvested shares, ending balance (usd per share)	$ 40.46	$ 40.85

Stock Awards and Stock Warran63

Stock Awards and Stock Warrants - Future Vesting Schedule of Nonvested Shares (Details)	Sep. 30, 2015shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	368,770
First year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	123,787
Second year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	117,592
Third year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	90,791
Fourth year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	34,600
Fifth year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares	2,000

Regulatory Matters-Actual Capit

Regulatory Matters-Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Consolidated
Total capital to risk weighted assets:
Actual Amount	$ 443,245	$ 402,326
Actual Ratio (percent)	11.86%	12.59%
Minimum Required for Capital Adequacy Purposes Amount	$ 299,064	$ 255,633
Minimum Required for Capital Adequacy Purposes Ratio (percent)	8.00%	8.00%
Tier 1 capital to risk weighted assets:
Actual Amount	$ 350,224	$ 314,136
Actual Ratio (percent)	9.37%	9.83%
Minimum Required for Capital Adequacy Purposes Amount	$ 224,298	$ 127,817
Minimum Required for Capital Adequacy Purposes Ratio (percent)	6.00%	4.00%
Common equity tier 1 to risk weighted assets
Actual Amount	$ 308,686
Actual Ratio (percent)	8.26%
Minimum Required for Capital Adequacy Purposes Amount	$ 168,224
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.50%
Tier 1 capital to average assets:
Actual Amount	$ 350,224	$ 314,136
Actual Ratio (percent)	8.67%	8.15%
Minimum Required for Capital Adequacy Purposes Amount	$ 161,513	$ 154,270
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.00%	4.00%
Bank
Total capital to risk weighted assets:
Actual Amount	$ 437,353	$ 397,512
Actual Ratio (percent)	11.72%	12.46%
Minimum Required for Capital Adequacy Purposes Amount	$ 298,397	$ 255,219
Minimum Required for Capital Adequacy Purposes Ratio (percent)	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 372,996	$ 319,024
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	10.00%	10.00%
Tier 1 capital to risk weighted assets:
Actual Amount	$ 412,265	$ 378,960
Actual Ratio (percent)	11.05%	11.88%
Minimum Required for Capital Adequacy Purposes Amount	$ 223,798	$ 127,609
Minimum Required for Capital Adequacy Purposes Ratio (percent)	6.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 298,397	$ 191,414
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	8.00%	6.00%
Common equity tier 1 to risk weighted assets
Actual Amount	$ 412,265
Actual Ratio (percent)	11.05%
Minimum Required for Capital Adequacy Purposes Amount	$ 167,848
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 242,447
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	6.50%
Tier 1 capital to average assets:
Actual Amount	$ 412,265	$ 378,960
Actual Ratio (percent)	10.21%	9.93%
Minimum Required for Capital Adequacy Purposes Amount	$ 161,453	$ 152,598
Minimum Required for Capital Adequacy Purposes Ratio (percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 201,817	$ 190,747
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (percent)	5.00%	5.00%

Business Combination - Addition

Business Combination - Additional Information (Details)	Jul. 23, 2015USD ($)	Sep. 30, 2015USD ($)property	Sep. 30, 2014USD ($)
Business Acquisition [Line Items]
Increase (decrease) in Goodwill		$ 361,000	$ 752,000
Increase (decrease) in deferred tax asset		193,000	109,000
Increase (decrease) in other liabilities		0	505,000
Increase (decrease) in real estate owned		(373,000)	$ 0
BOH Holdings, Inc.
Business Acquisition [Line Items]
Increase (decrease) in Goodwill		118,000
Increase (decrease) in deferred tax asset		63,000
Increase (decrease) in other liabilities		(181,000)
Houston Community Bancshares
Business Acquisition [Line Items]
Increase (decrease) in Goodwill		243,000
Increase (decrease) in deferred tax asset		$ 130,000
Disposition of real estate owned properties, number | property		2
Writedown of real estate owned property, number | property		1
Increase (decrease) in real estate owned		$ (373,000)
Grand Bank
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 80,100,000

Subsequent Events (Details)

Subsequent Events (Details)	Oct. 30, 2015$ / shares
Subsequent event
Subsequent Event [Line Items]
Dividends declared (per share)	$ 0.08