Business First Bancshares (BFST) 10-Q 13 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 13, 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
Entity Registrant Name	BUSINESS FIRST BANCSHARES, INC.
Entity Central Index Key	1,624,322
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		7,035,913

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and Due from Banks	$ 45,965	$ 26,015
Federal Funds Sold	10,570	817
Securities Available for Sale, at Fair Values	214,017	74,503
Loans and Lease Receivable, Net of Allowance for Loan Losses of $7,171 at September 30, 2015 and $6,632 at December 31, 2014	738,170	551,754
Premises and Equipment, Net	12,251	2,180
Accrued Interest Receivable	2,572	1,772
Other Equity Securities	5,013	1,799
Other Real Estate Owned	3,817	3,028
Cash Value of Life Insurance	22,186	17,376
Goodwill	3,605
Core Deposit Intangible	2,624
Other Assets	5,986	5,258
Total Assets	1,066,776	684,502
Deposits:
Noninterest Bearing	204,415	108,965
Interest Bearing	659,880	478,287
Total Deposits	864,295	587,252
Securities Sold Under Agreements to Repurchase	2,349
Short Term Borrowings	3,000
Federal Home Loan Bank Borrowings	79,658	15,000
Accrued Interest Payable	544	416
Other Liabilities	4,825	2,989
Total Liabilities	954,671	605,657
STOCKHOLDERS' EQUITY
Common Stock, $1 Par Value; 10,000,000 Shares Authorized; 7,205,913 Shares Issued and 7,035,913 Shares Outstanding at September 30, 2015; and 5,314,925 Shares Issued and Outstanding at December 31, 2014	7,036	5,315
Additional Paid-in Capital	86,230	57,225
Retained Earnings	19,288	16,948
Accumulated Other Comprehensive Loss	(449)	(643)
Total Stockholders' Equity	112,105	78,845
Total Liabilities and Stockholders' Equity	$ 1,066,776	$ 684,502

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for Loan Losses	$ 7,171	$ 6,632
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	7,205,913	5,314,925
Common stock, shares outstanding	7,035,913	5,314,925

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	$ 10,068	$ 6,422	$ 25,448	$ 19,300
Interest and Dividends on Securities	937	395	2,348	1,266
Interest on Federal Funds Sold and Due From Banks	46	21	150	52
Total Interest Income	11,051	6,838	27,946	20,618
Interest Expense:
Interest on Deposits	972	934	2,875	2,763
Interest on Borrowings	163	79	427	232
Total Interest Expense	1,135	1,013	3,302	2,995
Net Interest Income	9,916	5,825	24,644	17,623
Provision for Loan Losses	150	400	450	700
Net Interest Income after Provision for Loan Losses	9,766	5,425	24,194	16,923
Other Income:
Service Charges on Deposit Accounts	467	137	1,056	429
Gain on Sales of Securities	2		2	6
Other Income	335	498	1,156	924
Total Other Income	804	635	2,214	1,359
Other Expenses:
Salaries and Employee Benefits	4,593	2,833	11,767	8,337
Occupancy and Equipment Expense	1,027	606	2,789	1,846
Other Expenses	3,634	1,234	7,564	3,788
Total Other Expenses	9,254	4,673	22,120	13,971
Income Before Income Taxes	1,316	1,387	4,288	4,311
Provision for Income Taxes	377	357	1,193	1,109
Net Income	$ 939	$ 1,030	$ 3,095	$ 3,202
Earnings Per Share:
Basic	$ 0.13	$ 0.19	$ 0.47	$ 0.60
Diluted	$ 0.12	$ 0.19	$ 0.45	$ 0.58

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]
Consolidated Net Income	$ 939	$ 1,030	$ 3,095	$ 3,202
Other Comprehensive Income (Loss):
Unrealized Gain (Loss) on Investment Securities	1,879	391	292	3,047
Reclassification Adjustment for Gains included in Net Income	2		2	6
Income Tax Effect	(640)	(133)	(100)	(1,038)
Other Comprehensive Income (Loss)	1,241	258	194	2,015
Consolidated Comprehensive Income (Loss)	$ 2,180	$ 1,288	$ 3,289	$ 5,217

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2013	$ 71,923	$ 5,315	$ 56,740	$ 12,915	$ (3,047)
Net Income	3,202			3,202
Other Comprehensive Income (Loss)	2,015				2,015
Stock Based Compensation Cost	374		374
Ending balance at Sep. 30, 2014	77,514	5,315	57,114	16,117	(1,032)
Beginning Balance at Dec. 31, 2014	78,845	5,315	57,225	16,948	(643)
Net Income	3,095			3,095
Other Comprehensive Income (Loss)	194				194
Merger Consideration - net	32,410	1,891	30,519
Stock Based Compensation Cost	366		366
Stock Repurchase	(2,805)	(170)	(1,880)	(755)
Ending balance at Sep. 30, 2015	$ 112,105	$ 7,036	$ 86,230	$ 19,288	$ (449)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ 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, 2014
Cash Flows From Operating Activities:
Consolidated Net Income	$ 939	$ 1,030	$ 3,095	$ 3,202
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities:
Provision for Loan Losses	150	400	450	700	$ 700
Depreciation and Amortization			847	609
Amortization of Purchase Accounting Valuations			(1,540)
Noncash Compensation Expense			364	373
Net Amortization of Securities			1,045	384
Gain on Sales of Securities	(2)		(2)	(6)
Gain on Sale of Other Real Estate Owned Net of Writedowns			(54)	(262)
(Gain) Loss on Sales of Other Assets			157
Increase in Cash Value of Life Insurance			(484)	(428)
Credit for Deferred Income Taxes			(926)	(83)
Changes in Assets and Liabilities:
(Increase) Decrease in Accrued Interest Receivable			(63)	288
(Increase) Decrease in Other Assets			(503)	242
Decrease in Accrued Interest Payable			(98)	(56)
Increase in Other Liabilities			216	1,012
Net Cash Provided by Operating Activities			2,504	5,975
Cash Flows From Investing Activities:
Purchases of Securities Available for Sale			(48,987)	(1,108)
Proceeds from Maturities / Sales of Securities Available for Sale			3,367	25,449
Proceeds from Paydowns of Securities Available for Sale			13,613	4,424
Net Cash Received in Merger			87,377
Purchases of Other Equity Securities			(3,038)	(544)
Proceeds from Sales of Other Equity Securities			1,902	1,866
Net Increase in Loans			(43,167)	(6,769)
Purchases of Premises and Equipment			(570)	(190)
Proceeds from Sales of Other Real Estate			682	337
Net Increase in Federal Funds Sold			(9,413)	(11,380)
Cash Paid in Dissenter Settlement			(243)
Net Cash Provided by (Used in) Investing Activities			1,523	12,085
Cash Flows From Financing Activities:
Net Increase (Decrease) in Deposits			(6,166)	5,938
Net Increase (Decrease) in Securities Sold Under Agreements to Repurchase			(1,927)
Net Advances on Federal Home Loan Bank Borrowings			23,821
Net Increase in Short Term Borrowings			3,000
Repurchase of Common Stock			(2,805)
Net Cash Provided by Financing Activities			15,923	5,938
Net Increase in Cash and Cash Equivalents			19,950	23,998
Cash and Cash Equivalents at Beginning of Period			26,015	10,074	10,074
Cash and Cash Equivalents at End of Period	$ 45,965	$ 34,072	45,965	34,072	$ 26,015
Supplemental Disclosures for Cash Flow Information:
Interest on Deposits			2,828	2,819
Interest on Borrowings			705	232
Income Tax Payments			2,502	1,511
Supplemental Schedule for Noncash Investing and Financing Activities:
Change in the Unrealized Gain on Securities Available for Sale			294	3,054
Change in Deferred Tax Effect on the Unrealized Gain on Securities Available for Sale			(100)	(1,038)
Transfer of Loans to Other Real Estate			$ 806	$ 1,641

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1 – Basis of Presentation – The unaudited consolidated financial statements include the accounts of Business First Bancshares, Inc. (the Company or Bancshares) and its wholly-owned subsidiary, Business First Bank (the Bank), and its wholly-owned subsidiaries, Business First Insurance, LLC and American Gateway Insurance Agency, LLC. The Bank operates in fifteen full service locations and two loan production offices in Louisiana (Baton Rouge metro region, Shreveport, Covington, Lafayette, Lake Charles, Houma (LPO) and New Orleans (LPO)). As a state bank, it is subject to regulation by the Office of Financial Institutions, State of Louisiana, and the Federal Deposit Insurance Corporation and undergoes periodic examinations by these agencies. The Company is regulated by the Federal Reserve and is also subject to periodic examinations. In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the Company’s consolidated balance sheet, statement of income, comprehensive income, changes in stockholders’ equity and cash flows for the periods presented, and all such adjustments are of a normal recurring nature. All material intercompany transactions are eliminated. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the entire year. These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with accounting principles generally accepted in the United State of America (“U.S. GAAP”) have been omitted or abbreviated. Preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions the Company may undertake in the future. Estimates are used in accounting for, among other items, the allowance for loan losses, useful lives for depreciation and amortization, fair value of financial instruments, deferred taxes, and contingencies. Estimates that are particularly susceptible to significant change for the Company include the determination of the allowance for loan losses and the assessment of deferred tax assets and liabilities, and therefore are critical accounting policies. Management does not anticipate any material changes to estimates in the near term. Factors that may cause sensitivity to the aforementioned estimates include but are not limited to: external market factors such as market interest rates and employment rates, changes to operating policies and procedures, economic conditions in our markets, and changes in applicable banking regulations. Actual results may ultimately differ from estimates, although management does not generally believe such differences would materially affect the consolidated financial statements in any individual reporting period presented.

Reclassifications

Reclassifications	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reclassifications	Note 2 – Reclassifications – Certain reclassifications may have been made to conform to the classifications adopted for reporting in 2015. These reclassifications have no effect on previously reported net income.

Mergers and Acquisitions

Mergers and Acquisitions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Mergers and Acquisitions	Note 3 – Mergers and Acquisitions – After the close of business on March 31, 2015, the Company merged with American Gateway Financial Corporation (AGFC), parent bank holding company for American Gateway Bank, into which the operations of AGFC merged with the Company. Prior to the merger, AGFC was a full service bank with 10 branches located in the Baton Rouge metro region. As part of the merger, the Company issued common stock, as well as cash, for the outstanding shares of AGFC. The Company believes with this merger, it will not only increase its presence in the Baton Rouge region, but also in Louisiana statewide, by being able to offer more services to its customers. The Company also believes that the merger with AGFC will increase the Company’s core deposits and allow the opportunity to further increase the loan portfolio. Results of operations include the revenues and expenses of the acquired operations from the acquisition date forward. The following table provides the purchase price calculation as of the merger date and the identifiable assets purchased and the liabilities assumed at their estimated fair values. The purchase price calculation is an estimate, as the cash consideration to shareholders who have exercised their statutory rights of appraisal has not yet been finalized. The fair value measurements are subject to refinement for up to one year after the merger date based on additional information that may be obtained by us that existed as of the merger date. Cost and Allocation of Purchase Price for American Gateway Financial Corporation (AGFC): (Dollars in thousands, except per share data) Purchase Price: AGFC Shares Outstanding at March 31, 2015 217,944 Gross Business First Shares Issued for AGFC Shares 2,589,174 Exchange Ratio 11.88 Less: Shares Cashed Out Under Terms of Merger 698,186 Net Business First Shares to be Issued for AGFC Shares 1,890,988 Market Value per Share of Business First Stock 17.66 Aggregate Pro Forma Value of Business First Stock Issued in Merger $ 33,395 Aggregate Cash Consideration Paid in Merger 1,595 Cash Paid to Shareholders Exercising Appraisal Rights through September 30, 2015 * 9,419 Total Pro Forma Purchase Price $ 44,409 Net Assets Acquired: Cash and Cash Equivalents $ 98,489 Securities Available for Sale 108,358 Loans and Leases Receivable 143,223 Premises and Equipment, Net 10,459 Cash Value of Life Insurance 4,326 Other Real Estate Owned 593 Core Deposit Intangible 2,762 Other Assets 3,381 Total Assets 371,591 Noninterest Bearing Deposits 80,865 Interest Bearing Deposits 202,442 Total Deposits 283,307 Borrowings 45,509 Other Liabilities 1,971 Total Liablilites 330,787 Net Assets Acquired 40,804 Goodwill Resulting from Merger $ 3,605 * - Unsettled Appraisal Rights Shares at September 30, 2015 was 53,094. The following table provides the unaudited pro forma results of operations for the three and nine month periods ended September 30, 2015 and 2014, as if the acquisition occurred on January 1 of each year. These adjustments reflect the impact of certain purchase accounting fair value measurements, primarily comprised of AGFC’s loan, securities and deposit portfolios. The pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction been effected on the assumed date. For The Three Months For The Nine Months Ended September 30, Ended September 30, 2015 2014 2015 2014 (Dollars in thousands, except per share data) Interest Income $ 10,923 $ 9,951 $ 30,336 $ 30,026 Interest Expense 934 1,406 3,153 4,191 Net Interest Income 9,989 8,545 27,183 25,835 Provision for Loan Losses 150 450 450 950 Net Interest Income after Provision for Loan Losses 9,839 8,095 26,733 24,885 Noninterest Income 786 1,222 2,857 3,738 Noninterest Expense 9,365 7,417 25,039 22,903 Income Before Income Taxes 1,260 1,900 4,551 5,720 Income Tax Expense 358 364 1,298 1,088 Net Income $ 902 $ 1,536 $ 3,253 $ 4,632 Earnings Per Common Share Basic $ 0.13 $ 0.21 $ 0.45 $ 0.65 Diluted $ 0.12 $ 0.21 $ 0.43 $ 0.62

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings per Common Share	Note 4 – Earnings per Common Share – Basic earnings per share (EPS) represents income available to common stockholders divided by the weighted average number of common shares outstanding; no dilution for any potentially convertible shares is included in the calculation. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the Company. The potential common shares that may be issued by the Company relate to outstanding stock warrants and stock options. For The Three Months For The Nine Months Ended September 30, Ended September 30, 2015 2014 2015 2014 (Dollars in thousands, except per share data) Numerator: Net Income Available to Common Shares $ 939 $ 1,030 $ 3,095 $ 3,202 Denominator: Weighted Average Common Shares Outstanding 7,204,065 5,314,925 6,578,878 5,314,925 Dilutive Effect of Stock Options and Warrants 293,578 188,769 293,578 188,769 Weighted Average Dilutive Common Shares 7,497,643 5,503,694 6,872,456 5,503,694 Basic Earnings Per Common Share From Net Income Available to Common Shares $ 0.13 $ 0.19 $ 0.47 $ 0.60 Diluted Earnings Per Common Share From Net Income Available to Common Shares $ 0.12 $ 0.19 $ 0.45 $ 0.58

Securities

Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Securities	Note 5 – Securities – The amortized cost and fair values of securities available for sale as of September 30, 2015 and December 31, 2014 are summarized as follows: September 30, 2015 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 14,169 $ 49 $ 13 $ 14,205 Corporate Securities 11,184 15 53 11,146 Mortgage-Backed Securities 123,368 127 703 122,792 Municipal Securities 64,945 549 242 65,252 Other Securities 1,031 — 409 622 $ 214,697 $ 740 $ 1,420 $ 214,017 December 31, 2014 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 9,260 $ 31 $ 149 $ 9,142 Corporate Securities — — — — Mortgage-Backed Securities 34,591 51 616 34,026 Municipal Securities 30,324 562 226 30,660 Other Securities 1,302 — 627 675 $ 75,477 $ 644 $ 1,618 $ 74,503 The following table is a summary of securities with gross unrealized losses and fair values at September 30, 2015 and December 31, 2014, aggregated by investment category and length of time in a continued unrealized loss position. Due to the nature of these investments and current prevailing market prices, these unrealized losses are considered a temporary impairment of the securities. September 30, 2015 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross U.S. Government Agencies $ 4,487 $ 13 $ — $ — $ 4,487 $ 13 Corporate Securities 9,076 53 — — 9,076 53 Mortgage-Backed Securities 69,568 311 25,764 392 95,332 703 Municipal Securities 27,701 153 4,016 89 31,717 242 Other Securities — — 622 409 622 409 $ 110,832 $ 530 $ 30,402 $ 890 $ 141,234 $ 1,420 December 31, 2014 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross U.S. Government Agencies $ — $ — $ 8,003 $ 149 $ 8,003 $ 149 Corporate Securities — — — — — — Mortgage-Backed Securities — — 32,714 616 32,714 616 Municipal Securities 4,703 20 9,687 206 14,390 226 Other Securities — — 675 627 675 627 $ 4,703 $ 20 $ 51,079 $ 1,598 $ 55,782 $ 1,618 Management evaluates securities for other than temporary impairment when economic and market conditions warrant such evaluations. Consideration is given to the extent and length of time the fair value has been below cost, the reasons for the decline in value, and the Company’s intent to sell a security or whether it is more likely than not that the Company will be required to sell the security before the recovery of its amortized cost. The Company developed a process to identify securities that could potentially have a credit impairment that is other than temporary. This process involves evaluating each security for impairment by monitoring credit performance, collateral type, collateral geography, loan-to-value ratios, credit scores, loss severity levels, pricing levels, downgrades by rating agencies, cash flow projections and other factors as indicators of potential credit issues. When the Company determines that a security is deemed to be other than temporarily impaired, an impairment loss is recognized. The amortized cost and fair values of securities available for sale as of September 30, 2015 by contractual maturity are shown below. Actual maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Amortized Fair (Dollars in thousands) Less Than One Year $ 2,516 $ 2,520 One to Five Years 37,529 37,824 Over Five to Ten Years 62,156 62,166 Over Ten Years 112,496 111,507 $ 214,697 $ 214,017

Loans and the Allowance for Loa

Loans and the Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans and the Allowance for Loan Losses	Note 6 – Loans and the Allowance for Loan Losses – Loans receivable at September 30, 2015 and December 31, 2014 are summarized as follows: September 30, December 31, (Dollars in thousands) Real estate loans: Construction and land $ 105,387 $ 61,062 Farmland 9,963 16,097 1-4 family residential 96,267 41,552 Multi-family residential 18,597 11,369 Nonfarm nonresidential 295,268 215,797 Commercial 193,226 185,291 Consumer 26,633 27,218 Total loans held for investment 745,341 558,386 Less: Allowance for loan losses (7,171 ) (6,632 ) Net loans $ 738,170 $ 551,754 The Bank grants loans and extensions of credit to individuals and a variety of businesses and corporations located in its general market areas throughout Louisiana. Management segregates the loan portfolio into portfolio segments which is defined as the level at which the Bank develops and documents a systematic method for determining its allowance for loan losses. The portfolio segments are segregated based on loan types and the underlying risk factors present in each loan type. Such risk factors are periodically reviewed by management and revised as deemed appropriate. Loans acquired in business combinations are initially recorded at fair value, which includes an estimate of credit losses expected to be realized over the remaining lives of the loans, and therefore no corresponding allowance for loan losses is recorded for these loans at acquisition. Methods utilized to estimate any subsequently required allowance for loan losses for acquired loans not deemed credit-impaired at acquisition are similar to originated loans; however, the estimate of loss is based on the unpaid principal balance and then compared to any remaining unaccreted purchase discount. To the extent the calculated loss is greater than the remaining unaccreted discount, an allowance is recorded for such difference. The following table sets forth, as of September 30, 2015 and December 31, 2014, the balance of the allowance for loan losses by portfolio segment, disaggregated by impairment methodology, which is then further segregated by amounts evaluated for impairment collectively and individually. The allowance for loan losses allocated to each portfolio segment is not necessarily indicative of future losses in any particular portfolio segment and does not restrict the use of the allowance to absorb losses in other portfolio segments. Allowance for Credit Losses and Recorded Investment in Loans Receivable September 30, 2015 (Dollars in thousands) Real Estate: Real Estate: Real Estate: Real Estate: Multi-family Real Estate: Commercial Consumer Total Allowance for credit losses: Beginning Balance $ 525 $ 19 $ 775 $ 35 $ 1,140 $ 3,813 $ 325 $ 6,632 Charge-offs — — (135 ) — (44 ) (60 ) — (239 ) Recoveries 34 — 67 — 12 129 86 328 Provision 59 5 90 12 123 146 15 450 Ending Balance $ 618 $ 24 $ 797 $ 47 $ 1,231 $ 4,028 $ 426 $ 7,171 Ending Balance: Individually evaluated for impairment $ 523 $ — $ 62 $ — $ — $ 470 $ — $ 1,055 Collectively evaluated for impairment $ 95 $ 24 $ 711 $ 47 $ 1,231 $ 3,558 $ 426 $ 6,092 Purchased Credit Impaired (1) $ — $ — $ 24 $ — $ — $ — $ — $ 24 Loans receivable: Ending Balance $ 105,387 $ 9,963 $ 96,267 $ 18,597 $ 295,268 $ 193,226 $ 26,633 $ 745,341 Ending Balance: Individually evaluated for impairment $ 3,016 $ — $ 3,082 $ — $ 3,947 $ 5,230 $ — $ 15,275 Collectively evaluated for impairment $ 102,078 $ 9,963 $ 92,670 $ 18,359 $ 288,293 $ 187,996 $ 26,633 $ 725,992 Purchased Credit Impaired (1) $ 293 $ — $ 515 $ 238 $ 3,028 $ — $ — $ 4,074 (1) Purchased credit impaired loans are evaluated for impairement on an individual basis. December 31, 2014 (Dollars in thousands) Real Estate: Real Estate: Real Estate: Real Estate: Multi-family Real Estate: Commercial Consumer Total Allowance for credit losses: Beginning balance $ 315 $ 6 $ 836 $ 22 $ 946 $ 3,647 $ 271 $ 6,043 Charge-offs — — (174 ) — — (10 ) — (184 ) Recoveries — — 29 — — 16 28 73 Provision 210 13 84 13 194 160 26 700 Ending Balance $ 525 $ 19 $ 775 $ 35 $ 1,140 $ 3,813 $ 325 $ 6,632 Ending Balance: Individually evaluated for impairment $ 505 $ — $ — $ — $ — $ 41 $ — $ 546 Collectively evaluated for impairment $ 20 $ 19 $ 775 $ 35 $ 1,140 $ 3,772 $ 325 $ 6,086 Loans receivable: Ending Balance $ 61,062 $ 16,097 $ 41,552 $ 11,369 $ 215,797 $ 185,291 $ 27,218 $ 558,386 Ending Balance: Individually evaluated for impairment $ 2,772 $ — $ 977 $ — $ 4,358 $ 3,714 $ 47 $ 11,868 Collectively evaluated for impairment $ 58,290 $ 16,097 $ 40,575 $ 11,369 $ 211,439 $ 181,577 $ 27,171 $ 546,518 Management further disaggregates the loan portfolio segments into classes of loans, which are based on the initial measurement of the loan, risk characteristics of the loan and the method for monitoring and assessing the credit risk of the loan. As of September 30, 2015 and December 31, 2014, the credit quality indicators, disaggregated by class of loan, are as follows: Credit Quality Indicators September 30, 2015 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 97,573 $ 3,445 $ 1,508 $ 2,861 $ 105,387 Farmland 9,963 — — — 9,963 1-4 family residential 88,189 1,890 3,489 2,699 96,267 Multi-family residential 17,278 945 374 — 18,597 Nonfarm nonresidential 263,292 12,437 18,008 1,531 295,268 Commercial 171,808 7,462 12,289 1,667 193,226 Consumer 26,220 381 32 — 26,633 Total $ 674,323 $ 26,560 $ 35,700 $ 8,758 $ 745,341 December 31, 2014 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 56,740 $ 2,069 $ 642 $ 1,611 $ 61,062 Farmland 16,097 — — — 16,097 1-4 family residential 39,702 912 786 152 41,552 Multi-family residential 10,463 906 — — 11,369 Nonfarm nonresidential 190,356 16,410 7,812 1,219 215,797 Commercial 161,904 12,087 11,254 46 185,291 Consumer 26,654 517 47 — 27,218 Total $ 501,916 $ 32,901 $ 20,541 $ 3,028 $ 558,386 The above classifications follow regulatory guidelines and can generally be described as follows: • Pass loans are of satisfactory quality. • Special mention loans have an existing weakness that could cause future impairment, including the deterioration of financial ratios, past due status, questionable management capabilities and possible reduction in the collateral values. • Substandard loans have an existing specific and well defined weakness that may include poor liquidity and deterioration of financial ratios. The loan may be past due and related deposit accounts experiencing overdrafts. Immediate corrective action is necessary. • Doubtful loans have specific weaknesses that are severe enough to make collection or liquidation in full highly questionable and improbable. The following table reflects certain information with respect to the loan portfolio delinquencies by loan class and amount as of September 30, 2015 and December 31, 2014. All loans greater than 90 days past due are generally placed on non-accrual status. Aged Analysis of Past Due Loans Receivable September 30, 2015 (Dollars in thousands) Recorded Greater Investment Over 30-59 Days 60-89 Days Than 90 Days Total Total Loans 90 Days Past Due Past Due Past Due Past Due Past Due Current Receivable and Still Accruing Real Estate Loans: Construction and land $ 367 $ 371 $ 1,441 $ 2,179 $ 103,208 $ 105,387 $ — Farmland — — — — 9,963 9,963 — 1-4 family residential 1,601 224 779 2,604 93,663 96,267 — Multi-family residential — — — — 18,597 18,597 — Nonfarm nonresidential 119 506 255 880 294,388 295,268 — Commercial 45 — 1,661 1,706 191,520 193,226 — Consumer 5 — — 5 26,628 26,633 — Total $ 2,137 $ 1,101 $ 4,136 $ 7,374 $ 737,967 $ 745,341 $ — December 31, 2014 (Dollars in thousands) Recorded Greater Investment Over 30-59 Days 60-89 Days Than 90 Days Total Total Loans 90 Days Past Due Past Due Past Due Past Due Past Due Current Receivable and Still Accruing Real Estate Loans: Construction and land $ — $ — $ 182 $ 182 $ 60,880 $ 61,062 $ — Farmland — — — — 16,097 16,097 — 1-4 family residential — — 63 63 41,489 41,552 5 Multi-family residential — — — — 11,369 11,369 — Nonfarm nonresidential — — 311 311 215,486 215,797 — Commercial 41 — — 41 185,250 185,291 — Consumer — — — — 27,218 27,218 — Total $ 41 $ — $ 556 $ 597 $ 557,789 $ 558,386 $ 5 The following is a summary of information pertaining to impaired loans as of September 30, 2015 and December 31, 2014. Acquired non-impaired loans are placed on nonaccrual status and reported as impaired using the same criteria applied to the originated portfolio. Purchased impaired credits are excluded from this table. The interest income recognized for impaired loans was insignificant. September 30, 2015 (Dollars in thousands) Unpaid Average Recorded Principal Related Recorded Investment Balance Allowance Investment With an allowance recorded: Real Estate Loans: Construction and land $ 1,413 $ 1,568 $ 523 $ 1,396 Farmland — — — — 1-4 family residential 109 110 62 12 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 1,661 1,661 470 743 Consumer — — — — $ 3,183 $ 3,339 $ 1,055 $ 2,151 With no allowance recorded: Real Estate Loans: Construction and land $ 1,603 $ 1,608 $ — $ 1,431 Farmland — — — — 1-4 family residential 2,973 3,453 — 1,554 Multi-family residential — — — — Nonfarm nonresidential 3,947 5,367 — 4,066 Other Loans: Commercial 3,569 3,573 — 3,583 Consumer — — — 19 $ 12,092 $ 14,001 $ — $ 10,653 Total Impaired Loans: Real Estate Loans: Construction and land $ 3,016 $ 3,176 $ 523 $ 2,827 Farmland — — — — 1-4 family residential 3,082 3,563 62 1,566 Multi-family residential — — — — Nonfarm nonresidential 3,947 5,367 — 4,066 Other Loans: Commercial 5,230 5,234 470 4,326 Consumer — — — 19 $ 15,275 $ 17,340 $ 1,055 $ 12,804 December 31, 2014 (Dollars in thousands) Unpaid Average Recorded Principal Related Recorded Investment Balance Allowance Investment With an allowance recorded: Real Estate Loans: Construction and land $ 1,428 $ 1,428 $ 505 $ 1,345 Farmland — — — — 1-4 family residential — — — 83 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 41 41 41 3 Consumer — — — — $ 1,469 $ 1,469 $ 546 $ 1,431 With no allowance recorded: Real Estate Loans: Construction and land $ 1,344 $ 1,344 $ — $ 1,905 Farmland — — — — 1-4 family residential 977 1,020 — 1,090 Multi-family residential — — — — Nonfarm nonresidential 4,358 5,264 — 5,069 Other Loans: Commercial 3,673 3,673 — 3,753 Consumer 47 47 — 205 $ 10,399 $ 11,348 $ — $ 12,022 Total Impaired Loans: Real Estate Loans: Construction and land $ 2,772 $ 2,772 $ 505 $ 3,250 Farmland — — — — 1-4 family residential 977 1,020 — 1,173 Multi-family residential — — — — Nonfarm nonresidential 4,358 5,264 — 5,069 Other Loans: Commercial 3,714 3,714 41 3,756 Consumer 47 47 — 205 $ 11,868 $ 12,817 $ 546 $ 13,453 The Company elected to account for certain loans acquired in the AGFC merger as acquired impaired loans under FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (“ASC 310-30”) The following table presents the fair value of loans acquired with deteriorated credit quality as of the date of the AGFC merger. The expected cash flows approximated fair value as of the date of merger and, as a result, no accretable yield was recognized at acquisition. April 1, 2015 (Dollars in thousands) Purchased Impaired Credits: Contractually required principal and interest $ 11,294 Nonaccretable difference 6,375 Cash flows expected to be collected 4,919 Accretable yield — Fair value of Purchased Impaired Credits $ 4,919 The following table presents the changes in the carrying amount of the purchased impaired credits from the April 1, 2015 merger date to September 30, 2015. Purchased Impaired Credits (Dollars in thousands) Carrying amount - April 1, 2015 (acquisition) $ 4,919 Payments received, net (845 ) Carrying amount - September 30, 2015 $ 4,074 Total loans acquired in the AGFC merger included $142.8 million of performing loans not accounted for under ASC 310-30. The Bank seeks to assist customers that are experiencing financial difficulty by renegotiating loans within lending regulations and guidelines. The Bank makes loan modifications, primarily utilizing internal renegotiation programs via direct customer contact, that manage customers’ debt exposures held only by the Bank. Additionally, the Bank makes loan modifications with customers who have elected to work with external renegotiation agencies and these modifications provide solutions to customers’ entire unsecured debt structures. During the periods ended September 30, 2015 and December 31, 2014, the concessions granted to certain borrowers included extending the payment due dates, lowering the contractual interest rate, reducing accrued interest, and reducing the debt’s face or maturity amount. Once modified in a troubled debt restructuring, a loan is generally considered impaired until its contractual maturity. At the time of the restructuring, the loan is evaluated for an asset-specific allowance for credit losses. The Bank continues to specifically reevaluate the loan in subsequent periods, regardless of the borrower’s performance under the modified terms. If a borrower subsequently defaults on the loan after it is restructured the Bank provides an allowance for credit losses for the amount of the loan that exceeds the value of the related collateral. The following tables present informative data regarding loan modifications occurring as of September 30, 2015 and December 31, 2014. Modifications as of September 30, 2015: Pre-Modification Post-Modification Number Outstanding Outstanding of Recorded Recorded Contracts Investment Investment (Dollars in thousands) Troubled Debt Restructing Real Estate Loans: Construction and land 1 $ 1,586 $ 1,162 1-4 family residential 5 1,568 1,024 Nonfarm nonresidential 3 5,143 3,675 Other Loans: Commercial 4 3,786 3,518 Total Loans 13 $ 12,083 $ 9,379 Modifications as of December 31, 2014: Pre-Modification Post-Modification Number Outstanding Outstanding of Recorded Recorded Contracts Investment Investment (Dollars in thousands) Troubled Debt Restructing Real Estate Loans: Construction and land 1 $ 1,586 $ 1,162 1-4 family residential 5 1,519 973 Nonfarm nonresidential 5 7,201 4,047 Other Loans: Commercial 6 3,888 3,658 Consumer 2 139 47 Total Loans 19 $ 14,333 $ 9,887

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 7 – Fair Value of Financial Instruments – Fair Value Disclosures The Company groups its financial assets and liabilities measured at fair value in three levels. Fair value should be based on the assumptions market participants would use when pricing the asset or liability and establishes a fair value hierarchy that prioritizes the inputs used to develop those assumptions and measure fair value. The hierarchy requires companies to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: • Level 1 – Includes the most reliable sources, and includes quoted prices in active markets for identical assets or liabilities. • Level 2 – Includes observable inputs. Observable inputs include inputs other than quoted prices that are observable for the asset or liability (for example, interest rates and yield curves at commonly quoted intervals, volatilities, prepayment speeds, loss severities, credit risks, and default rates) as well as inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs). • Level 3 – Includes unobservable inputs and should be used only when observable inputs are unavailable. Recurring Basis Fair values of investment securities available for sale were primarily measured using information from a third-party pricing service. This pricing service provides information by utilizing evaluated pricing models supported with market data information. Standard inputs include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, benchmark securities, bids, offers, and reference data from market research publications. The following tables present the balance of assets and liabilities measured on a recurring basis as of September 30, 2015 and December 31, 2014. The Company did not record any liabilities at fair value for which measurement of the fair value was made on a recurring basis. Quoted Prices in Significant Active Markets Other Significant for Identical Observable Unobservable Assets Inputs Inputs Fair Value (Level 1) (Level 2) (Level 3) (Dollars in thousands) September 30, 2015 Available for Sale: U.S. Government Agency Securities $ 14,205 $ — $ 14,205 $ — Corporate Securities 11,146 — 11,146 — Mortgage-Backed Securities 122,792 — 122,792 — Municipal Securities 65,252 — 65,252 — Other Securities 622 — 622 — Total $ 214,017 $ — $ 214,017 $ — December 31, 2014 Available for Sale: U.S. Government Agency Securities $ 9,142 $ — $ 9,142 $ — Corporate Securities — — — — Mortgage-Backed Securities 34,026 — 34,026 — Municipal Securities 30,660 — 30,660 — Other Securities 675 — 675 — Total $ 74,503 $ — $ 74,503 $ — Nonrecurring Basis The Company has segregated all financial assets and liabilities that are measured at fair value on a nonrecurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the table below. The Company did not record any liabilities at fair value for which measurement of the fair value was made on a nonrecurring basis. The fair value of the impaired loans is measured at the fair value of the collateral for collateral-dependent loans. Impaired loans are Level 2 assets measured using appraisals from external parties of the collateral less any prior liens. Repossessed assets are initially recorded at fair value less estimated cost to sell. The fair value of repossessed assets is based on property appraisals and an analysis of similar properties available. As such, the Bank records repossessed assets as Level 2. Fair Value Quoted Prices in Significant Significant (Dollars in thousands) September 30, 2015 Assets: Impaired Loans $ 18,270 $ — $ 18,270 $ — Repossessed Assets 3,817 — 3,817 — Total $ 22,087 $ — $ 22,087 $ — December 31, 2014 Assets: Impaired Loans $ 11,322 $ — $ 11,322 $ — Repossessed Assets 3,028 — 3,028 — Total $ 14,350 $ — $ 14,350 $ — Fair Value Financial Instruments The fair value of a financial instrument is the current amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. In accordance with generally accepted accounting principles, certain financial instruments and all non-financial instruments are excluded from these disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company. The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value: Cash and Short-Term Investments – For those short-term instruments, the carrying amount is a reasonable estimate of fair value. Securities – Fair value of securities is based on quoted market prices. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities. Loans – The fair value for loans is estimated using discounted cash flow analyses, with interest rates currently being offered for similar loans to borrowers with similar credit rates. Loans with similar classifications are aggregated for purposes of the calculations. The allowance for loan losses, which was used to measure the credit risk, is subtracted from loans. Cash Value of Bank-Owned Life Insurance (BOLI) – The carrying amount approximates its fair value. Deposits – The fair value of demand deposits and certain money market deposits is the amount payable at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated using discounted cash flow analyses, with interest rates currently offered for deposits of similar remaining maturities. Borrowings – The fair value of FHLB advances and other long-term borrowings is estimated using the rates currently offered for advances of similar maturities. The carrying amount of short-term borrowings maturing within ninety days approximates the fair value. Commitments to Extend Credit and Standby and Commercial Letters of Credit – The fair values of commitments to extend credit and standby and commercial letters of credit do not differ significantly from the commitment amount and are therefore omitted from this disclosure. The estimated approximate fair values of the Bank’s financial instruments as of September 30, 2015 and December 31, 2014 are as follows: Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) September 30, 2015 Financial Assets: Cash and Short-Term Investments $ 56,535 $ 56,535 $ 56,535 $ — $ — Securities 214,017 214,017 — 214,017 — Loans - Net 738,170 737,913 — — 737,913 Cash Value of BOLI 22,186 22,186 — 22,186 — $ 1,030,908 $ 1,030,651 $ 56,535 $ 236,203 $ 737,913 Financial Liabilities: Deposits $ 864,295 $ 858,439 $ — $ — $ 858,439 Borrowings 85,007 85,861 — 85,861 — $ 949,302 $ 944,300 $ — $ 85,861 $ 858,439 Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) December 31, 2014 Financial Assets: Cash and Short-Term Investments $ 26,832 $ 26,832 $ 26,832 $ — $ — Securities 74,503 74,503 — 74,503 — Loans - Net 551,754 551,037 — — 551,037 Cash Value of BOLI 17,376 17,376 — 17,376 — $ 670,465 $ 669,748 $ 26,832 $ 91,879 $ 551,037 Financial Liabilities: Deposits $ 587,252 $ 581,239 $ — $ — $ 581,239 Borrowings 15,000 14,986 — 14,986 — $ 602,252 $ 596,225 $ — $ 14,986 $ 581,239

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	9 Months Ended
	Sep. 30, 2015
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	Note 8 – Recently Issued Accounting Pronouncements – In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-01, Investments – Equity Method and Joint Venture – Accounting for Investments in Qualified Affordable Housing Projects, In January 2014, the FASB issued ASU No. 2014-04, Receivables – Troubled Debt Restructurings by Creditors – Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure, In August 2014, the FASB issued ASU No. 2014-14, Receivables – Troubled Debt Restructurings by Creditors – Classification of Certain Government-Guaranteed Residential Mortgage Loans Upon Foreclosure, In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements – Going Concern: Disclosures of Uncertainties about an Entity’s Ability to Continue as a Going Concern,

Recently Issued Accounting Pr16

Recently Issued Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements – In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-01, Investments – Equity Method and Joint Venture – Accounting for Investments in Qualified Affordable Housing Projects, In January 2014, the FASB issued ASU No. 2014-04, Receivables – Troubled Debt Restructurings by Creditors – Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure, In August 2014, the FASB issued ASU No. 2014-14, Receivables – Troubled Debt Restructurings by Creditors – Classification of Certain Government-Guaranteed Residential Mortgage Loans Upon Foreclosure, In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements – Going Concern: Disclosures of Uncertainties about an Entity’s Ability to Continue as a Going Concern,

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Cost of Acquisition and Allocation of Purchase Price	The following table provides the purchase price calculation as of the merger date and the identifiable assets purchased and the liabilities assumed at their estimated fair values. The purchase price calculation is an estimate, as the cash consideration to shareholders who have exercised their statutory rights of appraisal has not yet been finalized. The fair value measurements are subject to refinement for up to one year after the merger date based on additional information that may be obtained by us that existed as of the merger date. Cost and Allocation of Purchase Price for American Gateway Financial Corporation (AGFC): (Dollars in thousands, except per share data) Purchase Price: AGFC Shares Outstanding at March 31, 2015 217,944 Gross Business First Shares Issued for AGFC Shares 2,589,174 Exchange Ratio 11.88 Less: Shares Cashed Out Under Terms of Merger 698,186 Net Business First Shares to be Issued for AGFC Shares 1,890,988 Market Value per Share of Business First Stock 17.66 Aggregate Pro Forma Value of Business First Stock Issued in Merger $ 33,395 Aggregate Cash Consideration Paid in Merger 1,595 Cash Paid to Shareholders Exercising Appraisal Rights through September 30, 2015 * 9,419 Total Pro Forma Purchase Price $ 44,409 Net Assets Acquired: Cash and Cash Equivalents $ 98,489 Securities Available for Sale 108,358 Loans and Leases Receivable 143,223 Premises and Equipment, Net 10,459 Cash Value of Life Insurance 4,326 Other Real Estate Owned 593 Core Deposit Intangible 2,762 Other Assets 3,381 Total Assets 371,591 Noninterest Bearing Deposits 80,865 Interest Bearing Deposits 202,442 Total Deposits 283,307 Borrowings 45,509 Other Liabilities 1,971 Total Liablilites 330,787 Net Assets Acquired 40,804 Goodwill Resulting from Merger $ 3,605 * - Unsettled Appraisal Rights Shares at September 30, 2015 was 53,094.
Summary of Unaudited Pro Forma Results of Operations	The following table provides the unaudited pro forma results of operations for the three and nine month periods ended September 30, 2015 and 2014, as if the acquisition occurred on January 1 of each year. These adjustments reflect the impact of certain purchase accounting fair value measurements, primarily comprised of AGFC’s loan, securities and deposit portfolios. The pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction been effected on the assumed date. For The Three Months For The Nine Months Ended September 30, Ended September 30, 2015 2014 2015 2014 (Dollars in thousands, except per share data) Interest Income $ 10,923 $ 9,951 $ 30,336 $ 30,026 Interest Expense 934 1,406 3,153 4,191 Net Interest Income 9,989 8,545 27,183 25,835 Provision for Loan Losses 150 450 450 950 Net Interest Income after Provision for Loan Losses 9,839 8,095 26,733 24,885 Noninterest Income 786 1,222 2,857 3,738 Noninterest Expense 9,365 7,417 25,039 22,903 Income Before Income Taxes 1,260 1,900 4,551 5,720 Income Tax Expense 358 364 1,298 1,088 Net Income $ 902 $ 1,536 $ 3,253 $ 4,632 Earnings Per Common Share Basic $ 0.13 $ 0.21 $ 0.45 $ 0.65 Diluted $ 0.12 $ 0.21 $ 0.43 $ 0.62

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Common Share	For The Three Months For The Nine Months Ended September 30, Ended September 30, 2015 2014 2015 2014 (Dollars in thousands, except per share data) Numerator: Net Income Available to Common Shares $ 939 $ 1,030 $ 3,095 $ 3,202 Denominator: Weighted Average Common Shares Outstanding 7,204,065 5,314,925 6,578,878 5,314,925 Dilutive Effect of Stock Options and Warrants 293,578 188,769 293,578 188,769 Weighted Average Dilutive Common Shares 7,497,643 5,503,694 6,872,456 5,503,694 Basic Earnings Per Common Share From Net Income Available to Common Shares $ 0.13 $ 0.19 $ 0.47 $ 0.60 Diluted Earnings Per Common Share From Net Income Available to Common Shares $ 0.12 $ 0.19 $ 0.45 $ 0.58

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Fair Values of Securities Available for Sale	The amortized cost and fair values of securities available for sale as of September 30, 2015 and December 31, 2014 are summarized as follows: September 30, 2015 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 14,169 $ 49 $ 13 $ 14,205 Corporate Securities 11,184 15 53 11,146 Mortgage-Backed Securities 123,368 127 703 122,792 Municipal Securities 64,945 549 242 65,252 Other Securities 1,031 — 409 622 $ 214,697 $ 740 $ 1,420 $ 214,017 December 31, 2014 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 9,260 $ 31 $ 149 $ 9,142 Corporate Securities — — — — Mortgage-Backed Securities 34,591 51 616 34,026 Municipal Securities 30,324 562 226 30,660 Other Securities 1,302 — 627 675 $ 75,477 $ 644 $ 1,618 $ 74,503
Summary of Securities with Gross Unrealized Losses and Fair Values	The following table is a summary of securities with gross unrealized losses and fair values at September 30, 2015 and December 31, 2014, aggregated by investment category and length of time in a continued unrealized loss position. Due to the nature of these investments and current prevailing market prices, these unrealized losses are considered a temporary impairment of the securities. September 30, 2015 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross U.S. Government Agencies $ 4,487 $ 13 $ — $ — $ 4,487 $ 13 Corporate Securities 9,076 53 — — 9,076 53 Mortgage-Backed Securities 69,568 311 25,764 392 95,332 703 Municipal Securities 27,701 153 4,016 89 31,717 242 Other Securities — — 622 409 622 409 $ 110,832 $ 530 $ 30,402 $ 890 $ 141,234 $ 1,420 December 31, 2014 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross U.S. Government Agencies $ — $ — $ 8,003 $ 149 $ 8,003 $ 149 Corporate Securities — — — — — — Mortgage-Backed Securities — — 32,714 616 32,714 616 Municipal Securities 4,703 20 9,687 206 14,390 226 Other Securities — — 675 627 675 627 $ 4,703 $ 20 $ 51,079 $ 1,598 $ 55,782 $ 1,618
Summary of Amortized Cost and Fair Values of Securities Available for Sale by Contractual Maturity	The amortized cost and fair values of securities available for sale as of September 30, 2015 by contractual maturity are shown below. Actual maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Amortized Fair (Dollars in thousands) Less Than One Year $ 2,516 $ 2,520 One to Five Years 37,529 37,824 Over Five to Ten Years 62,156 62,166 Over Ten Years 112,496 111,507 $ 214,697 $ 214,017

Loans and the Allowance for L20

Loans and the Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable at September 30, 2015 and December 31, 2014 are summarized as follows: September 30, December 31, (Dollars in thousands) Real estate loans: Construction and land $ 105,387 $ 61,062 Farmland 9,963 16,097 1-4 family residential 96,267 41,552 Multi-family residential 18,597 11,369 Nonfarm nonresidential 295,268 215,797 Commercial 193,226 185,291 Consumer 26,633 27,218 Total loans held for investment 745,341 558,386 Less: Allowance for loan losses (7,171 ) (6,632 ) Net loans $ 738,170 $ 551,754
Summary of Allowance for Credit Losses and Recorded Investment in Loans Receivable	Allowance for Credit Losses and Recorded Investment in Loans Receivable September 30, 2015 (Dollars in thousands) Real Estate: Real Estate: Real Estate: Real Estate: Multi-family Real Estate: Commercial Consumer Total Allowance for credit losses: Beginning Balance $ 525 $ 19 $ 775 $ 35 $ 1,140 $ 3,813 $ 325 $ 6,632 Charge-offs — — (135 ) — (44 ) (60 ) — (239 ) Recoveries 34 — 67 — 12 129 86 328 Provision 59 5 90 12 123 146 15 450 Ending Balance $ 618 $ 24 $ 797 $ 47 $ 1,231 $ 4,028 $ 426 $ 7,171 Ending Balance: Individually evaluated for impairment $ 523 $ — $ 62 $ — $ — $ 470 $ — $ 1,055 Collectively evaluated for impairment $ 95 $ 24 $ 711 $ 47 $ 1,231 $ 3,558 $ 426 $ 6,092 Purchased Credit Impaired (1) $ — $ — $ 24 $ — $ — $ — $ — $ 24 Loans receivable: Ending Balance $ 105,387 $ 9,963 $ 96,267 $ 18,597 $ 295,268 $ 193,226 $ 26,633 $ 745,341 Ending Balance: Individually evaluated for impairment $ 3,016 $ — $ 3,082 $ — $ 3,947 $ 5,230 $ — $ 15,275 Collectively evaluated for impairment $ 102,078 $ 9,963 $ 92,670 $ 18,359 $ 288,293 $ 187,996 $ 26,633 $ 725,992 Purchased Credit Impaired (1) $ 293 $ — $ 515 $ 238 $ 3,028 $ — $ — $ 4,074 (1) Purchased credit impaired loans are evaluated for impairement on an individual basis. December 31, 2014 (Dollars in thousands) Real Estate: Real Estate: Real Estate: Real Estate: Multi-family Real Estate: Commercial Consumer Total Allowance for credit losses: Beginning balance $ 315 $ 6 $ 836 $ 22 $ 946 $ 3,647 $ 271 $ 6,043 Charge-offs — — (174 ) — — (10 ) — (184 ) Recoveries — — 29 — — 16 28 73 Provision 210 13 84 13 194 160 26 700 Ending Balance $ 525 $ 19 $ 775 $ 35 $ 1,140 $ 3,813 $ 325 $ 6,632 Ending Balance: Individually evaluated for impairment $ 505 $ — $ — $ — $ — $ 41 $ — $ 546 Collectively evaluated for impairment $ 20 $ 19 $ 775 $ 35 $ 1,140 $ 3,772 $ 325 $ 6,086 Loans receivable: Ending Balance $ 61,062 $ 16,097 $ 41,552 $ 11,369 $ 215,797 $ 185,291 $ 27,218 $ 558,386 Ending Balance: Individually evaluated for impairment $ 2,772 $ — $ 977 $ — $ 4,358 $ 3,714 $ 47 $ 11,868 Collectively evaluated for impairment $ 58,290 $ 16,097 $ 40,575 $ 11,369 $ 211,439 $ 181,577 $ 27,171 $ 546,518
Summary of Credit Quality Indicators, Disaggregated by Class of Loan	Credit Quality Indicators September 30, 2015 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 97,573 $ 3,445 $ 1,508 $ 2,861 $ 105,387 Farmland 9,963 — — — 9,963 1-4 family residential 88,189 1,890 3,489 2,699 96,267 Multi-family residential 17,278 945 374 — 18,597 Nonfarm nonresidential 263,292 12,437 18,008 1,531 295,268 Commercial 171,808 7,462 12,289 1,667 193,226 Consumer 26,220 381 32 — 26,633 Total $ 674,323 $ 26,560 $ 35,700 $ 8,758 $ 745,341 December 31, 2014 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 56,740 $ 2,069 $ 642 $ 1,611 $ 61,062 Farmland 16,097 — — — 16,097 1-4 family residential 39,702 912 786 152 41,552 Multi-family residential 10,463 906 — — 11,369 Nonfarm nonresidential 190,356 16,410 7,812 1,219 215,797 Commercial 161,904 12,087 11,254 46 185,291 Consumer 26,654 517 47 — 27,218 Total $ 501,916 $ 32,901 $ 20,541 $ 3,028 $ 558,386
Summary of Aged Analysis of Past Due Loans Receivable	The following table reflects certain information with respect to the loan portfolio delinquencies by loan class and amount as of September 30, 2015 and December 31, 2014. All loans greater than 90 days past due are generally placed on non-accrual status. Aged Analysis of Past Due Loans Receivable September 30, 2015 (Dollars in thousands) Recorded Greater Investment Over 30-59 Days 60-89 Days Than 90 Days Total Total Loans 90 Days Past Due Past Due Past Due Past Due Past Due Current Receivable and Still Accruing Real Estate Loans: Construction and land $ 367 $ 371 $ 1,441 $ 2,179 $ 103,208 $ 105,387 $ — Farmland — — — — 9,963 9,963 — 1-4 family residential 1,601 224 779 2,604 93,663 96,267 — Multi-family residential — — — — 18,597 18,597 — Nonfarm nonresidential 119 506 255 880 294,388 295,268 — Commercial 45 — 1,661 1,706 191,520 193,226 — Consumer 5 — — 5 26,628 26,633 — Total $ 2,137 $ 1,101 $ 4,136 $ 7,374 $ 737,967 $ 745,341 $ — December 31, 2014 (Dollars in thousands) Recorded Greater Investment Over 30-59 Days 60-89 Days Than 90 Days Total Total Loans 90 Days Past Due Past Due Past Due Past Due Past Due Current Receivable and Still Accruing Real Estate Loans: Construction and land $ — $ — $ 182 $ 182 $ 60,880 $ 61,062 $ — Farmland — — — — 16,097 16,097 — 1-4 family residential — — 63 63 41,489 41,552 5 Multi-family residential — — — — 11,369 11,369 — Nonfarm nonresidential — — 311 311 215,486 215,797 — Commercial 41 — — 41 185,250 185,291 — Consumer — — — — 27,218 27,218 — Total $ 41 $ — $ 556 $ 597 $ 557,789 $ 558,386 $ 5
Summary of Information Pertaining to Impaired Loans	The following is a summary of information pertaining to impaired loans as of September 30, 2015 and December 31, 2014. Acquired non-impaired loans are placed on nonaccrual status and reported as impaired using the same criteria applied to the originated portfolio. Purchased impaired credits are excluded from this table. The interest income recognized for impaired loans was insignificant. September 30, 2015 (Dollars in thousands) Unpaid Average Recorded Principal Related Recorded Investment Balance Allowance Investment With an allowance recorded: Real Estate Loans: Construction and land $ 1,413 $ 1,568 $ 523 $ 1,396 Farmland — — — — 1-4 family residential 109 110 62 12 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 1,661 1,661 470 743 Consumer — — — — $ 3,183 $ 3,339 $ 1,055 $ 2,151 With no allowance recorded: Real Estate Loans: Construction and land $ 1,603 $ 1,608 $ — $ 1,431 Farmland — — — — 1-4 family residential 2,973 3,453 — 1,554 Multi-family residential — — — — Nonfarm nonresidential 3,947 5,367 — 4,066 Other Loans: Commercial 3,569 3,573 — 3,583 Consumer — — — 19 $ 12,092 $ 14,001 $ — $ 10,653 Total Impaired Loans: Real Estate Loans: Construction and land $ 3,016 $ 3,176 $ 523 $ 2,827 Farmland — — — — 1-4 family residential 3,082 3,563 62 1,566 Multi-family residential — — — — Nonfarm nonresidential 3,947 5,367 — 4,066 Other Loans: Commercial 5,230 5,234 470 4,326 Consumer — — — 19 $ 15,275 $ 17,340 $ 1,055 $ 12,804 December 31, 2014 (Dollars in thousands) Unpaid Average Recorded Principal Related Recorded Investment Balance Allowance Investment With an allowance recorded: Real Estate Loans: Construction and land $ 1,428 $ 1,428 $ 505 $ 1,345 Farmland — — — — 1-4 family residential — — — 83 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 41 41 41 3 Consumer — — — — $ 1,469 $ 1,469 $ 546 $ 1,431 With no allowance recorded: Real Estate Loans: Construction and land $ 1,344 $ 1,344 $ — $ 1,905 Farmland — — — — 1-4 family residential 977 1,020 — 1,090 Multi-family residential — — — — Nonfarm nonresidential 4,358 5,264 — 5,069 Other Loans: Commercial 3,673 3,673 — 3,753 Consumer 47 47 — 205 $ 10,399 $ 11,348 $ — $ 12,022 Total Impaired Loans: Real Estate Loans: Construction and land $ 2,772 $ 2,772 $ 505 $ 3,250 Farmland — — — — 1-4 family residential 977 1,020 — 1,173 Multi-family residential — — — — Nonfarm nonresidential 4,358 5,264 — 5,069 Other Loans: Commercial 3,714 3,714 41 3,756 Consumer 47 47 — 205 $ 11,868 $ 12,817 $ 546 $ 13,453
Fair Value of Loans Acquired with Deteriorated Credit Quality	The following table presents the fair value of loans acquired with deteriorated credit quality as of the date of the AGFC merger. The expected cash flows approximated fair value as of the date of merger and, as a result, no accretable yield was recognized at acquisition. April 1, 2015 (Dollars in thousands) Purchased Impaired Credits: Contractually required principal and interest $ 11,294 Nonaccretable difference 6,375 Cash flows expected to be collected 4,919 Accretable yield — Fair value of Purchased Impaired Credits $ 4,919
Summary of Changes in Carrying Amount of Purchased Impaired Credits	The following table presents the changes in the carrying amount of the purchased impaired credits from the April 1, 2015 merger date to September 30, 2015. Purchased Impaired Credits (Dollars in thousands) Carrying amount - April 1, 2015 (acquisition) $ 4,919 Payments received, net (845 ) Carrying amount - September 30, 2015 $ 4,074
Summary of Informative Data Regarding Loan Modifications	The following tables present informative data regarding loan modifications occurring as of September 30, 2015 and December 31, 2014. Modifications as of September 30, 2015: Pre-Modification Post-Modification Number Outstanding Outstanding of Recorded Recorded Contracts Investment Investment (Dollars in thousands) Troubled Debt Restructing Real Estate Loans: Construction and land 1 $ 1,586 $ 1,162 1-4 family residential 5 1,568 1,024 Nonfarm nonresidential 3 5,143 3,675 Other Loans: Commercial 4 3,786 3,518 Total Loans 13 $ 12,083 $ 9,379 Modifications as of December 31, 2014: Pre-Modification Post-Modification Number Outstanding Outstanding of Recorded Recorded Contracts Investment Investment (Dollars in thousands) Troubled Debt Restructing Real Estate Loans: Construction and land 1 $ 1,586 $ 1,162 1-4 family residential 5 1,519 973 Nonfarm nonresidential 5 7,201 4,047 Other Loans: Commercial 6 3,888 3,658 Consumer 2 139 47 Total Loans 19 $ 14,333 $ 9,887

Fair Value of Financial Instr21

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Summary of Financial Assets Measured at Fair Value on Recurring Basis	The following tables present the balance of assets and liabilities measured on a recurring basis as of September 30, 2015 and December 31, 2014. The Company did not record any liabilities at fair value for which measurement of the fair value was made on a recurring basis. Quoted Prices in Significant Active Markets Other Significant for Identical Observable Unobservable Assets Inputs Inputs Fair Value (Level 1) (Level 2) (Level 3) (Dollars in thousands) September 30, 2015 Available for Sale: U.S. Government Agency Securities $ 14,205 $ — $ 14,205 $ — Corporate Securities 11,146 — 11,146 — Mortgage-Backed Securities 122,792 — 122,792 — Municipal Securities 65,252 — 65,252 — Other Securities 622 — 622 — Total $ 214,017 $ — $ 214,017 $ — December 31, 2014 Available for Sale: U.S. Government Agency Securities $ 9,142 $ — $ 9,142 $ — Corporate Securities — — — — Mortgage-Backed Securities 34,026 — 34,026 — Municipal Securities 30,660 — 30,660 — Other Securities 675 — 675 — Total $ 74,503 $ — $ 74,503 $ —
Summary of Financial Assets Measured at Fair Value on a Nonrecurring Basis	The fair value of repossessed assets is based on property appraisals and an analysis of similar properties available. As such, the Bank records repossessed assets as Level 2. Fair Value Quoted Prices in Significant Significant (Dollars in thousands) September 30, 2015 Assets: Impaired Loans $ 18,270 $ — $ 18,270 $ — Repossessed Assets 3,817 — 3,817 — Total $ 22,087 $ — $ 22,087 $ — December 31, 2014 Assets: Impaired Loans $ 11,322 $ — $ 11,322 $ — Repossessed Assets 3,028 — 3,028 — Total $ 14,350 $ — $ 14,350 $ —
Schedule of Estimated Fair Values of Banks Financial Instruments	The estimated approximate fair values of the Bank’s financial instruments as of September 30, 2015 and December 31, 2014 are as follows: Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) September 30, 2015 Financial Assets: Cash and Short-Term Investments $ 56,535 $ 56,535 $ 56,535 $ — $ — Securities 214,017 214,017 — 214,017 — Loans - Net 738,170 737,913 — — 737,913 Cash Value of BOLI 22,186 22,186 — 22,186 — $ 1,030,908 $ 1,030,651 $ 56,535 $ 236,203 $ 737,913 Financial Liabilities: Deposits $ 864,295 $ 858,439 $ — $ — $ 858,439 Borrowings 85,007 85,861 — 85,861 — $ 949,302 $ 944,300 $ — $ 85,861 $ 858,439 Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) December 31, 2014 Financial Assets: Cash and Short-Term Investments $ 26,832 $ 26,832 $ 26,832 $ — $ — Securities 74,503 74,503 — 74,503 — Loans - Net 551,754 551,037 — — 551,037 Cash Value of BOLI 17,376 17,376 — 17,376 — $ 670,465 $ 669,748 $ 26,832 $ 91,879 $ 551,037 Financial Liabilities: Deposits $ 587,252 $ 581,239 $ — $ — $ 581,239 Borrowings 15,000 14,986 — 14,986 — $ 602,252 $ 596,225 $ — $ 14,986 $ 581,239

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail)	Jun. 30, 2015Branches
American Gateway Financial Corporation [Member]
Business Acquisition [Line Items]
Number of branches	10

Mergers and Acquisitions - Cost

Mergers and Acquisitions - Cost of Acquisition and Allocation of Purchase Price (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Purchase Price:
AGFC Shares Outstanding at March 31, 2015 | shares	53,094
Net Assets Acquired:
Goodwill Resulting from Merger	$ 3,605
American Gateway Financial Corporation [Member]
Purchase Price:
AGFC Shares Outstanding at March 31, 2015 | shares	217,944
Gross Business First Shares Issued for AGFC Shares | shares	2,589,174
Exchange Ratio	11.88
Less: Shares Cashed Out Under Terms of Merger | shares	698,186
Net Business First Shares to be Issued for AGFC Shares | shares	1,890,988
Market Value per Share of Business First Stock | $ / shares	$ 17.66
Aggregate Pro Forma Value of Business First Stock Issued in Merger	$ 33,395
Aggregate Cash Consideration Paid in Merger	1,595
Cash Paid to Shareholders Exercising Appraisal Rights through September 30, 2015	9,419
Total Pro Forma Purchase Price	44,409
Net Assets Acquired:
Cash and Cash Equivalents	98,489
Securities Available for Sale	108,358
Loans and Leases Receivable	143,223
Premises and Equipment, Net	10,459
Cash Value of Life Insurance	4,326
Other Real Estate Owned	593
Core Deposit Intangible	2,762
Other Assets	3,381
Total Assets	371,591
Noninterest Bearing Deposits	80,865
Interest Bearing Deposits	202,442
Total Deposits	283,307
Borrowings	45,509
Other Liabilities	1,971
Total Liabilities	330,787
Net Assets Acquired	40,804
Goodwill Resulting from Merger	$ 3,605

Mergers and Acquisitions - Co24

Mergers and Acquisitions - Cost of Acquisition and Allocation of Purchase Price (Parenthetical) (Detail)	Sep. 30, 2015shares
Business Combinations [Abstract]
Unsettled Appraisal Rights Shares at September 30, 2015	53,094

Mergers and Acquisitions - Summ

Mergers and Acquisitions - Summary of Unaudited Pro Forma Results of Operations (Detail) - American Gateway Financial Corporation [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Interest Income	$ 10,923	$ 9,951	$ 30,336	$ 30,026
Interest Expense	934	1,406	3,153	4,191
Net Interest Income	9,989	8,545	27,183	25,835
Provision for Loan Losses	150	450	450	950
Net Interest Income after Provision for Loan Losses	9,839	8,095	26,733	24,885
Noninterest Income	786	1,222	2,857	3,738
Noninterest Expense	9,365	7,417	25,039	22,903
Income Before Income Taxes	1,260	1,900	4,551	5,720
Income Tax Expense	358	364	1,298	1,088
Net Income	$ 902	$ 1,536	$ 3,253	$ 4,632
Basic	$ 0.13	$ 0.21	$ 0.45	$ 0.65
Diluted	$ 0.12	$ 0.21	$ 0.43	$ 0.62

Earnings per Common Share - Com

Earnings per Common Share - Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net Income Available to Common Shares	$ 939	$ 1,030	$ 3,095	$ 3,202
Weighted Average Common Shares Outstanding	7,204,065	5,314,925	6,578,878	5,314,925
Dilutive Effect of Stock Options and Warrants	293,578	188,769	293,578	188,769
Weighted Average Dilutive Common Shares	7,497,643	5,503,694	6,872,456	5,503,694
Basic Earnings Per Common Share From Net Income Available to Common Shares	$ 0.13	$ 0.19	$ 0.47	$ 0.60
Diluted Earnings Per Common Share From Net Income Available to Common Shares	$ 0.12	$ 0.19	$ 0.45	$ 0.58

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 214,697	$ 75,477
Gross Unrealized Gains	740	644
Gross Unrealized Losses	1,420	1,618
Fair Value	214,017	74,503
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,169	9,260
Gross Unrealized Gains	49	31
Gross Unrealized Losses	13	149
Fair Value	14,205	9,142
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,184
Gross Unrealized Gains	15
Gross Unrealized Losses	53
Fair Value	11,146
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	123,368	34,591
Gross Unrealized Gains	127	51
Gross Unrealized Losses	703	616
Fair Value	122,792	34,026
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	64,945	30,324
Gross Unrealized Gains	549	562
Gross Unrealized Losses	242	226
Fair Value	65,252	30,660
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,031	1,302
Gross Unrealized Losses	409	627
Fair Value	$ 622	$ 675

Securities - Summary of Securit

Securities - Summary of Securities with Gross Unrealized Losses and Fair Values (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	$ 110,832	$ 4,703
Gross Unrealized Losses, Less Than 12 Months	530	20
Fair Value, 12 Months or Greater	30,402	51,079
Gross Unrealized Losses, 12 Months or Greater	890	1,598
Fair Value	141,234	55,782
Gross Unrealized Losses	1,420	1,618
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	4,487
Gross Unrealized Losses, Less Than 12 Months	13
Fair Value, 12 Months or Greater		8,003
Gross Unrealized Losses, 12 Months or Greater		149
Fair Value	4,487	8,003
Gross Unrealized Losses	13	149
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	9,076
Gross Unrealized Losses, Less Than 12 Months	53
Fair Value	9,076
Gross Unrealized Losses	53
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	69,568
Gross Unrealized Losses, Less Than 12 Months	311
Fair Value, 12 Months or Greater	25,764	32,714
Gross Unrealized Losses, 12 Months or Greater	392	616
Fair Value	95,332	32,714
Gross Unrealized Losses	703	616
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	27,701	4,703
Gross Unrealized Losses, Less Than 12 Months	153	20
Fair Value, 12 Months or Greater	4,016	9,687
Gross Unrealized Losses, 12 Months or Greater	89	206
Fair Value	31,717	14,390
Gross Unrealized Losses	242	226
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, 12 Months or Greater	622	675
Gross Unrealized Losses, 12 Months or Greater	409	627
Fair Value	622	675
Gross Unrealized Losses	$ 409	$ 627

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Fair Values of Securities Available for Sale by Contractual Maturity (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Investments, Debt and Equity Securities [Abstract]
Less Than One Year, Amortized cost	$ 2,516
One to Five Years, Amortized cost	37,529
Over Five to Ten Years, Amortized cost	62,156
Over Ten Years, Amortized cost	112,496
Total, Amortized cost	214,697
Less Than One Year, Fair Value	2,520
One to Five Years, Fair Value	37,824
Over Five to Ten Years, Fair Value	62,166
Over Ten Years, Fair Value	111,507
Total, Fair Value	$ 214,017

Loans and the Allowance for L30

Loans and the Allowance for Loan Losses - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	$ 745,341	$ 558,386
Allowance for loan losses	(7,171)	(6,632)	$ (6,043)
Net loans	738,170	551,754
Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	105,387	61,062
Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	9,963	16,097
1-4 Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	96,267	41,552
Multi-family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	18,597	11,369
Nonfarm Nonresidential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	295,268	215,797
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	193,226	185,291
Allowance for loan losses	(4,028)	(3,813)	(3,647)
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	26,633	27,218
Allowance for loan losses	$ (426)	$ (325)	$ (271)

Loans and the Allowance for L31

Loans and the Allowance for Loan Losses - Summary of Allowance for Credit Losses and Recorded Investment in Loans Receivable (Detail) - USD ($) $ 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, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			$ 6,632	$ 6,043	$ 6,043
Allowance for credit losses, Charge-offs			(239)		(184)
Allowance for credit losses, Recoveries			328		73
Allowance for credit losses, Provision	$ 150	$ 400	450	700	700
Allowance for credit losses, Ending Balance	7,171		7,171		6,632
Allowance for credit losses, Individually evaluated for impairment	1,055		1,055		546
Allowance for credit losses, Collectively evaluated for impairment	6,092		6,092		6,086
Allowance for credit losses, Purchased Credit Impaired	24		24
Loans receivable, Ending Balance	745,341		745,341		558,386
Loans receivable, Individually evaluated for impairment	15,275		15,275		11,868
Loans receivable, Collectively evaluated for impairment	725,992		725,992		546,518
Loans receivable, Purchased Credit Impaired	4,074		4,074
Real Estate Construction And Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			525	315	315
Allowance for credit losses, Recoveries			34
Allowance for credit losses, Provision			59		210
Allowance for credit losses, Ending Balance	618		618		525
Allowance for credit losses, Individually evaluated for impairment	523		523		505
Allowance for credit losses, Collectively evaluated for impairment	95		95		20
Loans receivable, Ending Balance	105,387		105,387		61,062
Loans receivable, Individually evaluated for impairment	3,016		3,016		2,772
Loans receivable, Collectively evaluated for impairment	102,078		102,078		58,290
Loans receivable, Purchased Credit Impaired	293		293
Real Estate Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			19	6	6
Allowance for credit losses, Provision			5		13
Allowance for credit losses, Ending Balance	24		24		19
Allowance for credit losses, Collectively evaluated for impairment	24		24		19
Loans receivable, Ending Balance	9,963		9,963		16,097
Loans receivable, Collectively evaluated for impairment	9,963		9,963		16,097
Real Estate 1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			775	836	836
Allowance for credit losses, Charge-offs			(135)		(174)
Allowance for credit losses, Recoveries			67		29
Allowance for credit losses, Provision			90		84
Allowance for credit losses, Ending Balance	797		797		775
Allowance for credit losses, Individually evaluated for impairment	62		62
Allowance for credit losses, Collectively evaluated for impairment	711		711		775
Allowance for credit losses, Purchased Credit Impaired	24		24
Loans receivable, Ending Balance	96,267		96,267		41,552
Loans receivable, Individually evaluated for impairment	3,082		3,082		977
Loans receivable, Collectively evaluated for impairment	92,670		92,670		40,575
Loans receivable, Purchased Credit Impaired	515		515
Real Estate Multi-family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			35	22	22
Allowance for credit losses, Provision			12		13
Allowance for credit losses, Ending Balance	47		47		35
Allowance for credit losses, Collectively evaluated for impairment	47		47		35
Loans receivable, Ending Balance	18,597		18,597		11,369
Loans receivable, Collectively evaluated for impairment	18,359		18,359		11,369
Loans receivable, Purchased Credit Impaired	238		238
Real Estate Nonfarm Nonresidential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			1,140	946	946
Allowance for credit losses, Charge-offs			(44)
Allowance for credit losses, Recoveries			12
Allowance for credit losses, Provision			123		194
Allowance for credit losses, Ending Balance	1,231		1,231		1,140
Allowance for credit losses, Collectively evaluated for impairment	1,231		1,231		1,140
Loans receivable, Ending Balance	295,268		295,268		215,797
Loans receivable, Individually evaluated for impairment	3,947		3,947		4,358
Loans receivable, Collectively evaluated for impairment	288,293		288,293		211,439
Loans receivable, Purchased Credit Impaired	3,028		3,028
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			3,813	3,647	3,647
Allowance for credit losses, Charge-offs			(60)		(10)
Allowance for credit losses, Recoveries			129		16
Allowance for credit losses, Provision			146		160
Allowance for credit losses, Ending Balance	4,028		4,028		3,813
Allowance for credit losses, Individually evaluated for impairment	470		470		41
Allowance for credit losses, Collectively evaluated for impairment	3,558		3,558		3,772
Loans receivable, Ending Balance	193,226		193,226		185,291
Loans receivable, Individually evaluated for impairment	5,230		5,230		3,714
Loans receivable, Collectively evaluated for impairment	187,996		187,996		181,577
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			325	$ 271	271
Allowance for credit losses, Recoveries			86		28
Allowance for credit losses, Provision			15		26
Allowance for credit losses, Ending Balance	426		426		325
Allowance for credit losses, Collectively evaluated for impairment	426		426		325
Loans receivable, Ending Balance	26,633		26,633		27,218
Loans receivable, Individually evaluated for impairment					47
Loans receivable, Collectively evaluated for impairment	$ 26,633		$ 26,633		$ 27,171

Loans and the Allowance for L32

Loans and the Allowance for Loan Losses - Summary of Credit Quality Indicators, Disaggregated by Class of Loan (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	$ 745,341	$ 558,386
Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	105,387	61,062
Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	9,963	16,097
1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	96,267	41,552
Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	18,597	11,369
Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	295,268	215,797
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	193,226	185,291
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	26,633	27,218
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	674,323	501,916
Pass [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	97,573	56,740
Pass [Member] | Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	9,963	16,097
Pass [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	88,189	39,702
Pass [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	17,278	10,463
Pass [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	263,292	190,356
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	171,808	161,904
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	26,220	26,654
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	26,560	32,901
Special Mention [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	3,445	2,069
Special Mention [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	1,890	912
Special Mention [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	945	906
Special Mention [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	12,437	16,410
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	7,462	12,087
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	381	517
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	35,700	20,541
Substandard [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	1,508	642
Substandard [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	3,489	786
Substandard [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	374
Substandard [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	18,008	7,812
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	12,289	11,254
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	32	47
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	8,758	3,028
Doubtful [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	2,861	1,611
Doubtful [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	2,699	152
Doubtful [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	1,531	1,219
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	$ 1,667	$ 46

Loans and the Allowance for L33

Loans and the Allowance for Loan Losses - Summary of Aged Analysis of Past Due Loans Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 7,374	$ 597
Current	737,967	557,789
Total Loans Receivables	745,341	558,386
Recorded Investment Over 90 Days Past Due and Still Accruing		5
Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,179	182
Current	103,208	60,880
Total Loans Receivables	105,387	61,062
Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,963	16,097
Total Loans Receivables	9,963	16,097
1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,604	63
Current	93,663	41,489
Total Loans Receivables	96,267	41,552
Recorded Investment Over 90 Days Past Due and Still Accruing		5
Multi-family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	18,597	11,369
Total Loans Receivables	18,597	11,369
Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	880	311
Current	294,388	215,486
Total Loans Receivables	295,268	215,797
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,706	41
Current	191,520	185,250
Total Loans Receivables	193,226	185,291
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5
Current	26,628	27,218
Total Loans Receivables	26,633	27,218
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,137	41
30-59 Days Past Due [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	367
30-59 Days Past Due [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,601
30-59 Days Past Due [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	119
30-59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	41
30-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,101
60-89 Days Past Due [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	371
60-89 Days Past Due [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	224
60-89 Days Past Due [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	506
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,136	556
Greater Than 90 Days Past Due [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,441	182
Greater Than 90 Days Past Due [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	779	63
Greater Than 90 Days Past Due [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	255	$ 311
Greater Than 90 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,661

Loans and the Allowance for L34

Loans and the Allowance for Loan Losses - Summary of Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	$ 3,183	$ 1,469
Unpaid Principal Balance, with an allowance recorded	3,339	1,469
Related Allowance	1,055	546
Average Recorded Investment, with an allowance recorded	2,151	1,431
Recorded Investment, with no allowance recorded	12,092	10,399
Unpaid Principal Balance, with no allowance recorded	14,001	11,348
Average Recorded Investment, with no allowance recorded	10,653	12,022
Recorded Investment	15,275	11,868
Unpaid Principal Balance	17,340	12,817
Related Allowance	1,055	546
Average Recorded Investment	12,804	13,453
Construction and Land [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	1,413	1,428
Unpaid Principal Balance, with an allowance recorded	1,568	1,428
Related Allowance	523	505
Average Recorded Investment, with an allowance recorded	1,396	1,345
Recorded Investment, with no allowance recorded	1,603	1,344
Unpaid Principal Balance, with no allowance recorded	1,608	1,344
Average Recorded Investment, with no allowance recorded	1,431	1,905
Recorded Investment	3,016	2,772
Unpaid Principal Balance	3,176	2,772
Related Allowance	523	505
Average Recorded Investment	2,827	3,250
1-4 Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	109
Unpaid Principal Balance, with an allowance recorded	110
Related Allowance	62
Average Recorded Investment, with an allowance recorded	12	83
Recorded Investment, with no allowance recorded	2,973	977
Unpaid Principal Balance, with no allowance recorded	3,453	1,020
Average Recorded Investment, with no allowance recorded	1,554	1,090
Recorded Investment	3,082	977
Unpaid Principal Balance	3,563	1,020
Related Allowance	62
Average Recorded Investment	1,566	1,173
Nonfarm Nonresidential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with no allowance recorded	3,947	4,358
Unpaid Principal Balance, with no allowance recorded	5,367	5,264
Average Recorded Investment, with no allowance recorded	4,066	5,069
Recorded Investment	3,947	4,358
Unpaid Principal Balance	5,367	5,264
Average Recorded Investment	4,066	5,069
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	1,661	41
Unpaid Principal Balance, with an allowance recorded	1,661	41
Related Allowance	470	41
Average Recorded Investment, with an allowance recorded	743	3
Recorded Investment, with no allowance recorded	3,569	3,673
Unpaid Principal Balance, with no allowance recorded	3,573	3,673
Average Recorded Investment, with no allowance recorded	3,583	3,753
Recorded Investment	5,230	3,714
Unpaid Principal Balance	5,234	3,714
Related Allowance	470	41
Average Recorded Investment	4,326	3,756
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with no allowance recorded		47
Unpaid Principal Balance, with no allowance recorded		47
Average Recorded Investment, with no allowance recorded	19	205
Recorded Investment		47
Unpaid Principal Balance		47
Average Recorded Investment	$ 19	$ 205

Loans and the Allowance for L35

Loans and the Allowance for Loan Losses - Fair Value of Loans Acquired with Deteriorated Credit Quality (Detail) - American Gateway Financial Corporation [Member] $ in Thousands	Apr. 01, 2015USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Purchased Impaired Credits, Contractually required principal and interest	$ 11,294
Purchased Impaired Credits, Nonaccretable difference	6,375
Purchased Impaired Credits, Cash flows expected to be collected	4,919
Purchased Impaired Credits, Accretable yield	0
Purchased Impaired Credits, Fair value of Purchased Impaired Credits	$ 4,919

Loans and the Allowance for L36

Loans and the Allowance for Loan Losses - Summary of Changes in Carrying Amount of Purchased Impaired Credits (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Carrying amount, ending balance	$ 4,074
American Gateway Financial Corporation [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Carrying amount, beginning balance	4,919
Payments received, net	(845)
Carrying amount, ending balance	$ 4,074

Loans and the Allowance for L37

Loans and the Allowance for Loan Losses - Additional Information (Detail) $ in Millions	Sep. 30, 2015USD ($)
American Gateway Financial Corporation [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Performing loans	$ 142.8

Loans and the Allowance for L38

Loans and the Allowance for Loan Losses - Summary of Informative Data Regarding Loan Modifications (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015USD ($)Contracts	Dec. 31, 2014USD ($)Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	13	19
Pre-Modification Outstanding Recorded Investment	$ 12,083	$ 14,333
Post-Modification Outstanding Recorded Investment	$ 9,379	$ 9,887
Construction and Land [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	1	1
Pre-Modification Outstanding Recorded Investment	$ 1,586	$ 1,586
Post-Modification Outstanding Recorded Investment	$ 1,162	$ 1,162
1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	5	5
Pre-Modification Outstanding Recorded Investment	$ 1,568	$ 1,519
Post-Modification Outstanding Recorded Investment	$ 1,024	$ 973
Nonfarm Nonresidential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	3	5
Pre-Modification Outstanding Recorded Investment	$ 5,143	$ 7,201
Post-Modification Outstanding Recorded Investment	$ 3,675	$ 4,047
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	4	6
Pre-Modification Outstanding Recorded Investment	$ 3,786	$ 3,888
Post-Modification Outstanding Recorded Investment	$ 3,518	$ 3,658
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts		2
Pre-Modification Outstanding Recorded Investment		$ 139
Post-Modification Outstanding Recorded Investment		$ 47

Fair Value of Financial Instr39

Fair Value of Financial Instruments - Additional Information (Detail)	Sep. 30, 2015USD ($)
Fair Value Disclosures [Abstract]
Liabilities measured at fair value on a recurring basis	$ 0
Liabilities measured at fair value on a nonrecurring basis	$ 0

Fair Value of Financial Instr40

Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	$ 214,017	$ 74,503
U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	14,205	9,142
Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	11,146
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	122,792	34,026
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	65,252	30,660
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	622	675
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	214,017	74,503
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	214,017	74,503
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	14,205	9,142
Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	11,146
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	122,792	34,026
Fair Value, Measurements, Recurring [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	65,252	30,660
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	622	675
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	214,017	74,503
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	14,205	9,142
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	11,146
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	122,792	34,026
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	65,252	30,660
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	$ 622	$ 675

Fair Value of Financial Instr41

Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 22,087	$ 14,350
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	18,270	11,322
Repossessed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	3,817	3,028
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	22,087	14,350
Significant Other Observable Inputs (Level 2) [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	18,270	11,322
Significant Other Observable Inputs (Level 2) [Member] | Repossessed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 3,817	$ 3,028

Fair Value of Financial Instr42

Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Banks Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	$ 214,017	$ 74,503
Borrowings	79,658	15,000
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Short-Term Investments	56,535	26,832
Securities	214,017	74,503
Loans - Net	738,170	551,754
Cash Value of BOLI	22,186	17,376
Total Assets	1,030,908	670,465
Deposits	864,295	587,252
Borrowings	85,007	15,000
Total Liabilities	949,302	602,252
Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Short-Term Investments	56,535	26,832
Securities	214,017	74,503
Loans - Net	737,913	551,037
Cash Value of BOLI	22,186	17,376
Total Assets	1,030,651	669,748
Deposits	858,439	581,239
Borrowings	85,861	14,986
Total Liabilities	944,300	596,225
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Short-Term Investments	56,535	26,832
Total Assets	56,535	26,832
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	214,017	74,503
Cash Value of BOLI	22,186	17,376
Total Assets	236,203	91,879
Borrowings	85,861	14,986
Total Liabilities	85,861	14,986
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans - Net	737,913	551,037
Total Assets	737,913	551,037
Deposits	858,439	581,239
Total Liabilities	$ 858,439	$ 581,239