Business First Bancshares (BFST) 10-Q 12 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Aug. 12, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Trading Symbol	ck0001624322
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		7,037,413

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and Due from Banks	$ 88,480	$ 40,911
Federal Funds Sold	28,288	2,496
Securities Available for Sale, at Fair Values	207,528	210,857
Loans and Lease Receivable, Net of Allowance for Loan Losses of $7,380 at June 30, 2016 and $7,244 at December 31, 2015	790,470	765,148
Premises and Equipment, Net	9,219	9,234
Accrued Interest Receivable	2,945	2,823
Other Equity Securities	6,181	5,350
Other Real Estate Owned	1,919	2,033
Cash Value of Life Insurance	22,269	22,339
Goodwill	6,824	3,376
Core Deposit Intangible	2,417	2,555
Other Assets	7,602	8,967
Total Assets	1,174,142	1,076,089
Deposits:
Noninterest Bearing	243,351	222,488
Interest Bearing	755,307	681,748
Total Deposits	998,658	904,236
Securities Sold Under Agreements to Repurchase	2,541	2,435
Short Term Borrowings	3,000	3,000
Federal Home Loan Bank Borrowings	48,109	49,144
Accrued Interest Payable	726	566
Other Liabilities	4,990	4,259
Total Liabilities	1,058,024	963,640
STOCKHOLDERS' EQUITY
Common Stock, $1 Par Value; 10,000,000 Shares Authorized; 7,037,413 and 7,035,913 Shares Issued and Outstanding at June 30, 2016 and December 31, 2015, respectively	7,037	7,036
Additional Paid-in Capital	86,083	85,913
Retained Earnings	22,182	20,289
Accumulated Other Comprehensive Income (Loss)	816	(789)
Total Stockholders' Equity	116,118	112,449
Total Liabilities and Stockholders' Equity	$ 1,174,142	$ 1,076,089

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for Loan Losses	$ 7,380	$ 7,244
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	7,037,413	7,035,913
Common stock, shares outstanding	7,037,413	7,035,913

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest Income:
Interest and Fees on Loans	$ 9,570	$ 8,747	$ 19,267	$ 15,380
Interest and Dividends on Securities	929	968	1,903	1,411
Interest on Federal Funds Sold and Due From Banks	77	78	118	104
Total Interest Income	10,576	9,793	21,288	16,895
Interest Expense:
Interest on Deposits	1,317	1,053	2,424	1,903
Interest on Borrowings	158	178	332	264
Total Interest Expense	1,475	1,231	2,756	2,167
Net Interest Income	9,101	8,562	18,532	14,728
Provision for Loan Losses	150	150	820	300
Net Interest Income after Provision for Loan Losses	8,951	8,412	17,712	14,428
Other Income:
Service Charges on Deposit Accounts	489	440	983	589
Gain (Loss) on Sales of Securities	56		231
Other Income	725	541	1,497	821
Total Other Income	1,270	981	2,711	1,410
Other Expenses:
Salaries and Employee Benefits	5,027	4,236	9,723	7,174
Occupancy and Equipment Expense	1,021	1,105	2,124	1,762
Other Expenses	3,102	2,643	5,704	3,930
Total Other Expenses	9,150	7,984	17,551	12,866
Income Before Income Taxes	1,071	1,409	2,872	2,972
Provision for Income Taxes	230	386	627	816
Net Income	$ 841	$ 1,023	$ 2,245	$ 2,156
Earnings Per Share:
Basic	$ 0.12	$ 0.14	$ 0.32	$ 0.34
Diluted	$ 0.11	$ 0.14	$ 0.31	$ 0.33

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Consolidated Net Income	$ 841	$ 1,023	$ 2,245	$ 2,156
Other Comprehensive Income:
Unrealized Gain on Investment Securities	831	(2,229)	2,201	(1,587)
Reclassification Adjustment for Gains Included in Net Income	56		231
Income Tax Effect	(302)	758	(827)	540
Other Comprehensive Income	585	(1,471)	1,605	(1,047)
Consolidated Comprehensive Income	$ 1,426	$ (448)	$ 3,850	$ 1,109

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, 2014	$ 78,845	$ 5,315	$ 57,225	$ 16,948	$ (643)
Net Income	2,156			2,156
Other Comprehensive Income (Loss)	(1,047)				(1,047)
Merger Consideration - net	32,410	1,891	30,519
Stock Based Compensation Cost	243		243
Ending balance at Jun. 30, 2015	112,607	7,206	87,987	19,104	(1,690)
Beginning Balance at Dec. 31, 2015	112,449	7,036	85,913	20,289	(789)
Net Income	2,245			2,245
Other Comprehensive Income (Loss)	1,605				1,605
Cash Dividends Declared, $0.05 Per Share	(352)			(352)
Stock Based Compensation Cost	156		156
Exercise of Stock Warrants	15	1	14
Ending balance at Jun. 30, 2016	$ 116,118	$ 7,037	$ 86,083	$ 22,182	$ 816

Consolidated Statements of Cha7

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)	6 Months Ended
	Jun. 30, 2016$ / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends declared	$ 0.05

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows From Operating Activities:
Consolidated Net Income	$ 2,245	$ 2,156
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Loan Losses	820	300
Depreciation and Amortization	636	544
Amortization of Purchase Accounting Valuations	(936)	(205)
Noncash Compensation Expense	156	243
Net Amortization of Securities	928	562
Gain on Sale of Securities	(231)
Gain on Sale of Premises and Equipment	(24)
Gain on Sale of Other Real Estate Owned Net of Writedowns	(3)	(7)
Increase in Cash Value of Life Insurance	(490)	(310)
Provision (Credit) for Deferred Income Taxes	62	(663)
Changes in Assets and Liabilities:
Increase in Accrued Interest Receivable	(122)	(78)
(Increase) Decrease in Other Assets	476	(1,035)
Increase in Accrued Interest Payable	160	58
Increase in Other Liabilities	731	526
Net Cash Provided by Operating Activities	4,408	2,091
Cash Flows From Investing Activities:
Purchases of Securities Available for Sale	(35,881)	(32,257)
Proceeds from Maturities / Sales of Securities Available for Sale	29,836	1,836
Proceeds from Paydowns of Securities Available for Sale	11,109	7,481
Net Cash Received in Merger		87,377
Purchases of Other Equity Securities	(833)	(1,898)
Redemption of Other Equity Securities	2	1,651
Life Insurance Proceeds	560
Net Increase in Loans	(25,799)	(31,279)
Proceeds from Sale of Premises and Equipment	68
Purchases of Premises and Equipment	(665)	(176)
Proceeds from Sales of Other Real Estate	584	413
Improvements to Other Real Estate	(102)
Consideration Settlement to Former AGFC Shareholders	(3,448)
Net Increase in Federal Funds Sold	(25,792)	(12,262)
Net Cash Used in Investing Activities	(50,361)	20,886
Cash Flows From Financing Activities:
Net Increase in Deposits	94,422	55,580
Net Increase in Securities Sold Under Agreements to Repurchase	106	2,505
Net Repayments on Federal Home Loan Bank Borrowings	(669)	(569)
Proceeds from Exercise of Stock Warrants	15
Payment of Dividends on Common Stock	(352)
Net Cash Provided by Financing Activities	93,522	57,516
Net Increase in Cash and Cash Equivalents	47,569	80,493
Cash and Cash Equivalents at Beginning of Period	40,911	26,015
Cash and Cash Equivalents at End of Period	88,480	106,508
Supplemental Disclosures for Cash Flow Information:
Interest on Deposits	2,238	1,805
Interest	358	145
Income Tax Payments		1,852
Supplemental Schedule for Noncash Investing and Financing Activities:
Change in the Unrealized Gain (Loss) on Securities Available for Sale	2,432	(1,587)
Change in Deferred Tax Effect on the Unrealized (Gain) Loss on Securities Available for Sale	(827)	540
Transfer of Loans to Other Real Estate	$ 365	$ 117

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
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 sixteen full service banking centers, one loan production office, and one wealth solutions office in Louisiana (Baton Rouge metro region, Shreveport, Covington, Lafayette, Lake Charles, Houma 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 also regulated by the Federal Reserve and is 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	6 Months Ended
	Jun. 30, 2016
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 2016. These reclassifications have no effect on previously reported net income.

Mergers and Acquisitions

Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2016
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 and liabilities assumed at their estimated fair values. The fair value measures were subject to refinement for up to one year after the merger date based on additional information that was 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 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 12,867 Total Purchase Price $ 47,857 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 7,395 Cash Value of Life Insurance 4,326 Other Real Estate Owned 593 Core Deposit Intangible 2,762 Other Assets 6,375 Total Assets 371,521 Noninterest Bearing Deposits 80,865 Interest Bearing Deposits 202,442 Total Deposits 283,307 Borrowings 45,509 Other Liabilities 1,672 Total Liabilities 330,488 Net Assets Acquired 41,033 Goodwill Resulting from Merger $ 6,824

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2016
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 Six Months 2016 2015 2016 2015 (Dollars in thousands, except per share data) Numerator: Net Income Available to Common Shares $ 841 $ 1,023 $ 2,245 $ 2,156 Denominator: Weighted Average Common Shares Outstanding 7,037,413 7,196,883 7,037,207 6,261,103 Dilutive Effect of Stock Options and Warrants 311,308 293,600 311,308 293,600 Weighted Average Dilutive Common Shares 7,348,721 7,490,483 7,348,515 6,554,703 Basic Earnings Per Common Share From Net Income Available to Common Shares $ 0.12 $ 0.14 $ 0.32 $ 0.34 Diluted Earnings Per Common Share From Net Income Available to Common Shares $ 0.11 $ 0.14 $ 0.31 $ 0.33

Securities

Securities	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Securities	Note 5 – Securities – The amortized cost and fair values of securities available for sale as of June 30, 2016 and December 31, 2015 are summarized as follows: June 30, 2016 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 6,771 $ 116 $ — $ 6,887 Corporate Securities 11,162 — 127 11,035 Mortgage-Backed Securities 114,769 228 209 114,788 Municipal Securities 72,656 1,527 26 74,157 Other Securities 934 — 273 661 $ 206,292 $ 1,871 $ 635 $ 207,528 December 31, 2015 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 13,656 $ 43 $ 32 $ 13,667 Corporate Securities 11,177 — 105 11,072 Mortgage-Backed Securities 120,599 39 1,568 119,070 Municipal Securities 65,679 874 112 66,441 Other Securities 942 — 335 607 $ 212,053 $ 956 $ 2,152 $ 210,857 The following table is a summary of securities with gross unrealized losses and fair values at June 30, 2016 and December 31, 2015, 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. June 30, 2016 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross Corporate Securities $ 4,526 $ 21 $ 6,510 $ 106 $ 11,036 $ 127 Mortgage-Backed Securities 17,346 23 50,540 186 67,886 209 Municipal Securities 5,830 24 213 2 6,043 26 Other Securities — — 661 273 661 273 $ 27,702 $ 68 $ 57,924 $ 567 $ 85,626 $ 635 December 31, 2015 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross U.S. Government Agencies $ 8,840 $ 32 $ — $ — $ 8,840 $ 32 Corporate Securities 11,072 105 — — 11,072 105 Mortgage-Backed Securities 91,384 1,029 23,386 539 114,770 1,568 Municipal Securities 13,983 43 2,498 69 16,481 112 Other Securities — — 607 335 607 335 $ 125,279 $ 1,209 $ 26,491 $ 943 $ 151,770 $ 2,152 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 June 30, 2016 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 $ 2,818 $ 2,827 One to Five Years 44,374 44,910 Over Five to Ten Years 53,195 53,743 Over Ten Years 105,905 106,048 $ 206,292 $ 207,528

Loans and the Allowance for Loa

Loans and the Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Loans and the Allowance for Loan Losses	Note 6 – Loans and the Allowance for Loan Losses – Loans receivable at June 30, 2016 and December 31, 2015 are summarized as follows: June 30, December 31, (Dollars in thousands) Real estate loans: Construction and land $ 107,832 $ 97,872 Farmland 7,115 8,897 1-4 family residential 122,024 112,954 Multi-family residential 20,736 26,058 Nonfarm nonresidential 290,703 312,207 Commercial 205,847 185,276 Consumer 43,593 29,128 Total loans held for investment 797,850 772,392 Less: Allowance for loan losses (7,380 ) (7,244 ) Net loans $ 790,470 $ 765,148 The performing one-to-four family residential, multi-family residential, commercial real estate, and commercial loans are pledged, under a blanket lien, as collateral securing advances from the FHLB at June 30, 2016 and December 31, 2015. Net deferred loan origination fees were $800,000 and $740,000 at June 30, 2016 and December 31, 2015, respectively, and are netted in their respective loan categories above. In addition to loans issued in the normal course of business, the Company considers overdrafts on customer deposit accounts to be loans, and reclassifies overdrafts as loans in its consolidated balance sheets. At June 30, 2016 and December 31, 2015, overdrafts of $326,000 and $150,000, respectively, have been reclassified to loans. The Bank is the lead lender on participations sold, without recourse, to other financial institutions which are not included in the consolidated balance sheets. The unpaid principal balances of mortgages and other loans serviced for others were approximately $58.0 million and $44.7 million at June 30, 2016 and December 31, 2015, respectively. 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 June 30, 2016 and December 31, 2015, 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 June 30, 2016 (Dollars in thousands) Real Estate: Real Estate: Real Estate: Real Estate: Multi-family Real Estate: Commercial Consumer Total Allowance for credit losses: Beginning Balance $ 600 $ 30 $ 1,021 $ 101 $ 1,416 $ 3,618 $ 458 $ 7,244 Charge-offs (2 ) — (99 ) — (361 ) (390 ) — (852 ) Recoveries 9 — 95 — 1 30 33 168 Provision 251 21 369 75 739 (371 ) (264 ) 820 Ending Balance $ 858 $ 51 $ 1,386 $ 176 $ 1,795 $ 2,887 $ 227 $ 7,380 Ending Balance: Individually evaluated for impairment $ 505 $ — $ 180 $ — $ — $ 317 $ — $ 1,002 Collectively evaluated for impairment $ 353 $ 51 $ 1,152 $ 132 $ 1,795 $ 2,570 $ 227 $ 6,280 Purchased Credit Impaired (1) $ — $ — $ 54 $ 44 $ — $ — $ — $ 98 Loans receivable: Ending Balance $ 107,832 $ 7,115 $ 122,024 $ 20,736 $ 290,703 $ 205,847 $ 43,593 $ 797,850 Ending Balance: Individually evaluated for impairment $ 1,434 $ — $ 3,755 $ — $ 4,286 $ 3,441 $ — $ 12,916 Collectively evaluated for impairment $ 106,225 $ 7,115 $ 117,789 $ 20,534 $ 284,553 $ 202,406 $ 43,593 $ 782,215 Purchased Credit Impaired (1) $ 173 $ — $ 480 $ 202 $ 1,864 $ — $ — $ 2,719 (1) Purchased credit impaired loans are evaluated for impairment on an individual basis. December 31, 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 (102 ) — (144 ) — (44 ) (695 ) — (985 ) Recoveries 34 — 94 — 13 164 92 397 Provision 143 11 296 66 307 336 41 1,200 Ending Balance $ 600 $ 30 $ 1,021 $ 101 $ 1,416 $ 3,618 $ 458 $ 7,244 Ending Balance: Individually evaluated for impairment $ 504 $ — $ 129 $ — $ — $ 475 $ — $ 1,108 Collectively evaluated for impairment $ 96 $ 30 $ 838 $ 57 $ 1,416 $ 3,143 $ 458 $ 6,038 Purchased Credit Impaired (1) $ — $ — $ 54 $ 44 $ — $ — $ — $ 98 Loans receivable: Ending Balance $ 97,872 $ 8,897 $ 112,954 $ 26,058 $ 312,207 $ 185,276 $ 29,128 $ 772,392 Ending Balance: Individually evaluated for impairment $ 1,732 $ — $ 3,666 $ — $ 4,172 $ 2,226 $ — $ 11,796 Collectively evaluated for impairment $ 96,046 $ 8,897 $ 108,778 $ 25,829 $ 305,234 $ 183,050 $ 29,128 $ 756,962 Purchased Credit Impaired (1) $ 94 $ — $ 510 $ 229 $ 2,801 $ — $ — $ 3,634 (1) Purchased credit impaired loans are evaluated for impairment on an individual basis. 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 June 30, 2016 and December 31, 2015, the credit quality indicators, disaggregated by class of loan, are as follows: Credit Quality Indicators June 30, 2016 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 102,205 $ 2,319 $ 1,775 $ 1,533 $ 107,832 Farmland 7,115 — — — 7,115 1-4 family residential 113,267 2,342 3,126 3,289 122,024 Multi-family residential 19,879 — 655 202 20,736 Nonfarm nonresidential 263,811 13,782 11,320 1,790 290,703 Commercial 173,740 22,302 7,511 2,294 205,847 Consumer 43,156 268 169 — 43,593 Total $ 723,173 $ 41,013 $ 24,556 $ 9,108 $ 797,850 December 31, 2015 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 93,740 $ 1,300 $ 1,094 $ 1,738 $ 97,872 Farmland 8,897 — — — 8,897 1-4 family residential 104,720 1,824 3,205 3,205 112,954 Multi-family residential 24,884 945 — 229 26,058 Nonfarm nonresidential 281,503 12,727 16,171 1,806 312,207 Commercial 157,734 22,222 4,341 979 185,276 Consumer 28,702 396 30 — 29,128 Total $ 700,180 $ 39,414 $ 24,841 $ 7,957 $ 772,392 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 June 30, 2016 and December 31, 2015. All loans greater than 90 days past due are generally placed on non-accrual status. Aged Analysis of Past Due Loans Receivable June 30, 2016 (Dollars in thousands) 30-59 Days 60-89 Days Greater Total Current Total Loans Recorded Real Estate Loans: Construction and land $ 385 $ — $ 196 $ 581 $ 107,251 $ 107,832 $ — Farmland — — — — 7,115 7,115 — 1-4 family residential 1,314 76 793 2,183 119,841 122,024 — Multi-family residential — — — — 20,736 20,736 — Nonfarm nonresidential 317 — 681 998 289,705 290,703 — Commercial — 246 — 246 205,601 205,847 — Consumer — — — — 43,593 43,593 — Total $ 2,016 $ 322 $ 1,670 $ 4,008 $ 793,842 $ 797,850 $ — December 31, 2015 (Dollars in thousands) 30-59 Days 60-89 Days Greater Total Current Total Loans Recorded Real Estate Loans: Construction and land $ — $ 10 $ 384 $ 394 $ 97,478 $ 97,872 $ — Farmland — — — — 8,897 8,897 — 1-4 family residential 289 132 1,086 1,507 111,447 112,954 — Multi-family residential — — — — 26,058 26,058 — Nonfarm nonresidential 1,185 178 309 1,672 310,535 312,207 — Commercial 78 13 — 91 185,185 185,276 — Consumer — — — — 29,128 29,128 — Total $ 1,552 $ 333 $ 1,779 $ 3,664 $ 768,728 $ 772,392 $ — The following is a summary of information pertaining to impaired loans as of June 30, 2016 and December 31, 2015. 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 $138,000 and $303,000 for the six months ending June 30, 2016 and 2015, respectively. June 30, 2016 (Dollars in thousands) Recorded Unpaid Related Average With an allowance recorded: Real Estate Loans: Construction and land $ 1,288 $ 1,514 $ 505 $ 1,309 Farmland — — — — 1-4 family residential 340 373 180 304 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 1,831 1,851 317 1,141 Consumer — — — — $ 3,459 $ 3,738 $ 1,002 $ 2,754 With no allowance recorded: Real Estate Loans: Construction and land $ 146 $ 153 $ — $ 158 Farmland — — — — 1-4 family residential 3,415 3,983 — 3,432 Multi-family residential — — — — Nonfarm nonresidential 4,286 5,755 — 4,272 Other Loans: Commercial 1,610 2,721 — 1,820 Consumer — — — — $ 9,457 $ 12,612 $ — $ 9,682 Total Impaired Loans: Real Estate Loans: Construction and land $ 1,434 $ 1,667 $ 505 $ 1,467 Farmland — — — — 1-4 family residential 3,755 4,356 180 3,736 Multi-family residential — — — — Nonfarm nonresidential 4,286 5,755 — 4,272 Other Loans: Commercial 3,441 4,572 317 2,961 Consumer — — — — $ 12,916 $ 16,350 $ 1,002 $ 12,436 December 31, 2015 (Dollars in thousands) Recorded Unpaid Related Average With an allowance recorded: Real Estate Loans: Construction and land $ 1,336 $ 1,514 $ 504 $ 1,392 Farmland — — — — 1-4 family residential 305 313 129 78 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 975 1,653 475 908 Consumer — — — — $ 2,616 $ 3,480 $ 1,108 $ 2,378 With no allowance recorded: Real Estate Loans: Construction and land $ 396 $ 401 $ — $ 1,530 Farmland — — — — 1-4 family residential 3,361 3,898 — 1,933 Multi-family residential — — — — Nonfarm nonresidential 4,172 5,588 — 4,062 Other Loans: Commercial 1,251 1,255 — 3,368 Consumer — — — 14 $ 9,180 $ 11,142 $ — $ 10,907 Total Impaired Loans: Real Estate Loans: Construction and land $ 1,732 $ 1,915 $ 504 $ 2,922 Farmland — — — — 1-4 family residential 3,666 4,211 129 2,011 Multi-family residential — — — — Nonfarm nonresidential 4,172 5,588 — 4,062 Other Loans: Commercial 2,226 2,908 475 4,276 Consumer — — — 14 $ 11,796 $ 14,622 $ 1,108 $ 13,285 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 at Acquisition $ 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 June 30, 2016. Purchased (Dollars in thousands) Carrying amount - April 1, 2015 (acquisition) $ 4,919 Payments received, net of discounts realized (469 ) Charge-offs (204 ) Transfer to Other Real Estate (612 ) Carrying amount - December 31, 2015 3,634 Payments received, net of discounts realized (502 ) Charge-offs (263 ) Transfer to Other Real Estate (150 ) Carrying amount - June 30, 2016 $ 2,719 Total loans acquired in the AGFC merger included $142.8 million of performing loans not accounted for under ASC 310-30, which had an estimated fair value of $138.1 million as of the date of acquisition. As of June 30, 2016 and December 31, 2015, the AGFC performing loans totaled $76.9 million and $93.1 million, respectively, with a related purchase discount of $2.7 million and $3.2 million, respectively. 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 June 30, 2016 and December 31, 2015, 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 June 30, 2016 and December 31, 2015. The Bank had $54,000 in troubled debt restructurings that had subsequently defaulted during the year ended December 31, 2015, and none that subsequently defaulted during the six months ended June 30, 2016. Modifications as of June 30, 2016: Number Pre-Modification Post-Modification (Dollars in thousands) Troubled Debt Restructuring Real Estate Loans: 1-4 family residential 5 $ 1,568 $ 907 Nonfarm nonresidential 3 5,143 3,521 Other Loans: Commercial 4 3,294 2,690 Total Loans 12 $ 10,005 $ 7,118 Modifications as of December 31, 2015: Number Pre-Modification Post-Modification (Dollars in thousands) Troubled Debt Restructuring Real Estate Loans: 1-4 family residential 5 $ 1,568 $ 1,008 Nonfarm nonresidential 3 5,143 3,623 Other Loans: Commercial 3 1,736 1,234 Total Loans 11 $ 8,447 $ 5,865

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 and December 31, 2015. The Company did not record any liabilities at fair value for which measurement of the fair value was made on a recurring basis. Fair Value Quoted Prices in Significant Significant (Dollars in thousands) June 30, 2016 Available for Sale: U.S. Government Agency Securities $ 6,887 $ — $ 6,887 $ — Corporate Securities 11,035 — 11,035 — Mortgage-Backed Securities 114,788 — 114,788 — Municipal Securities 74,157 — 74,157 — Other Securities 661 — 661 — Total $ 207,528 $ — $ 207,528 $ — December 31, 2015 Available for Sale: U.S. Government Agency Securities $ 13,667 $ — $ 13,667 $ — Corporate Securities 11,072 — 11,072 — Mortgage-Backed Securities 119,070 — 119,070 — Municipal Securities 66,441 — 66,441 — Other Securities 607 — 607 — Total $ 210,857 $ — $ 210,857 $ — 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) June 30, 2016 Assets: Impaired Loans $ 14,535 $ — $ 14,535 $ — Repossessed Assets 1,919 — 1,919 — Total $ 16,454 $ — $ 16,454 $ — December 31, 2015 Assets: Impaired Loans $ 14,224 $ — $ 14,224 $ — Repossessed Assets 2,033 — 2,033 — Total $ 16,257 $ — $ 16,257 $ — 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. Other Equity Securities – 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 June 30, 2016 and December 31, 2015 are as follows: Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) June 30, 2016 Financial Assets: Cash and Short-Term Investments $ 116,768 $ 116,768 $ 116,768 $ — $ — Securities 207,528 207,528 — 207,528 — Loans - Net 790,470 787,596 — — 787,596 Cash Value of BOLI 22,269 22,269 — 22,269 — Other Equity Securities 6,181 6,181 — — 6,181 $ 1,143,216 $ 1,140,342 $ 116,768 $ 229,797 $ 793,777 Financial Liabilities: Deposits $ 998,658 $ 984,769 $ — $ — $ 984,769 Borrowings 53,650 53,634 — 53,634 — $ 1,052,308 $ 1,038,403 $ — $ 53,634 $ 984,769 Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) December 31, 2015 Financial Assets: Cash and Short-Term Investments $ 43,407 $ 43,407 $ 43,407 $ — $ — Securities 210,857 210,857 — 210,857 — Loans - Net 765,148 761,241 — — 761,241 Cash Value of BOLI 22,339 22,339 — 22,339 — Other Equity Securities 5,350 5,350 — — 5,350 $ 1,047,101 $ 1,043,194 $ 43,407 $ 233,196 $ 766,591 Financial Liabilities: Deposits $ 904,236 $ 897,771 $ — $ — $ 897,771 Borrowings 54,579 54,561 — 54,561 — $ 958,815 $ 952,332 $ — $ 54,561 $ 897,771

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	6 Months Ended
	Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	Note 8 – Recently Issued Accounting Pronouncements – In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805), Simplifying the Accounting for Measurement-Period Adjustments, In January 2016, the FASB issued ASU No. 2016-16, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities.

Recently Issued Accounting Pr17

Recently Issued Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements – In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805), Simplifying the Accounting for Measurement-Period Adjustments, In January 2016, the FASB issued ASU No. 2016-16, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2016
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 and liabilities assumed at their estimated fair values. The fair value measures were subject to refinement for up to one year after the merger date based on additional information that was 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 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 12,867 Total Purchase Price $ 47,857 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 7,395 Cash Value of Life Insurance 4,326 Other Real Estate Owned 593 Core Deposit Intangible 2,762 Other Assets 6,375 Total Assets 371,521 Noninterest Bearing Deposits 80,865 Interest Bearing Deposits 202,442 Total Deposits 283,307 Borrowings 45,509 Other Liabilities 1,672 Total Liabilities 330,488 Net Assets Acquired 41,033 Goodwill Resulting from Merger $ 6,824

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Common Share	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 Six Months 2016 2015 2016 2015 (Dollars in thousands, except per share data) Numerator: Net Income Available to Common Shares $ 841 $ 1,023 $ 2,245 $ 2,156 Denominator: Weighted Average Common Shares Outstanding 7,037,413 7,196,883 7,037,207 6,261,103 Dilutive Effect of Stock Options and Warrants 311,308 293,600 311,308 293,600 Weighted Average Dilutive Common Shares 7,348,721 7,490,483 7,348,515 6,554,703 Basic Earnings Per Common Share From Net Income Available to Common Shares $ 0.12 $ 0.14 $ 0.32 $ 0.34 Diluted Earnings Per Common Share From Net Income Available to Common Shares $ 0.11 $ 0.14 $ 0.31 $ 0.33

Securities (Tables)

Securities (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 and December 31, 2015 are summarized as follows: June 30, 2016 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 6,771 $ 116 $ — $ 6,887 Corporate Securities 11,162 — 127 11,035 Mortgage-Backed Securities 114,769 228 209 114,788 Municipal Securities 72,656 1,527 26 74,157 Other Securities 934 — 273 661 $ 206,292 $ 1,871 $ 635 $ 207,528 December 31, 2015 (Dollars in thousands) Amortized Gross Gross Fair U.S. Government Agencies $ 13,656 $ 43 $ 32 $ 13,667 Corporate Securities 11,177 — 105 11,072 Mortgage-Backed Securities 120,599 39 1,568 119,070 Municipal Securities 65,679 874 112 66,441 Other Securities 942 — 335 607 $ 212,053 $ 956 $ 2,152 $ 210,857
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 June 30, 2016 and December 31, 2015, 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. June 30, 2016 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross Corporate Securities $ 4,526 $ 21 $ 6,510 $ 106 $ 11,036 $ 127 Mortgage-Backed Securities 17,346 23 50,540 186 67,886 209 Municipal Securities 5,830 24 213 2 6,043 26 Other Securities — — 661 273 661 273 $ 27,702 $ 68 $ 57,924 $ 567 $ 85,626 $ 635 December 31, 2015 Less Than 12 Months 12 Months or Greater Total (Dollars in thousands) Fair Gross Fair Gross Fair Gross U.S. Government Agencies $ 8,840 $ 32 $ — $ — $ 8,840 $ 32 Corporate Securities 11,072 105 — — 11,072 105 Mortgage-Backed Securities 91,384 1,029 23,386 539 114,770 1,568 Municipal Securities 13,983 43 2,498 69 16,481 112 Other Securities — — 607 335 607 335 $ 125,279 $ 1,209 $ 26,491 $ 943 $ 151,770 $ 2,152
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 June 30, 2016 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 $ 2,818 $ 2,827 One to Five Years 44,374 44,910 Over Five to Ten Years 53,195 53,743 Over Ten Years 105,905 106,048 $ 206,292 $ 207,528

Loans and the Allowance for L21

Loans and the Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable at June 30, 2016 and December 31, 2015 are summarized as follows: June 30, December 31, (Dollars in thousands) Real estate loans: Construction and land $ 107,832 $ 97,872 Farmland 7,115 8,897 1-4 family residential 122,024 112,954 Multi-family residential 20,736 26,058 Nonfarm nonresidential 290,703 312,207 Commercial 205,847 185,276 Consumer 43,593 29,128 Total loans held for investment 797,850 772,392 Less: Allowance for loan losses (7,380 ) (7,244 ) Net loans $ 790,470 $ 765,148
Summary of Allowance for Credit Losses and Recorded Investment in Loans Receivable	Allowance for Credit Losses and Recorded Investment in Loans Receivable June 30, 2016 (Dollars in thousands) Real Estate: Real Estate: Real Estate: Real Estate: Multi-family Real Estate: Commercial Consumer Total Allowance for credit losses: Beginning Balance $ 600 $ 30 $ 1,021 $ 101 $ 1,416 $ 3,618 $ 458 $ 7,244 Charge-offs (2 ) — (99 ) — (361 ) (390 ) — (852 ) Recoveries 9 — 95 — 1 30 33 168 Provision 251 21 369 75 739 (371 ) (264 ) 820 Ending Balance $ 858 $ 51 $ 1,386 $ 176 $ 1,795 $ 2,887 $ 227 $ 7,380 Ending Balance: Individually evaluated for impairment $ 505 $ — $ 180 $ — $ — $ 317 $ — $ 1,002 Collectively evaluated for impairment $ 353 $ 51 $ 1,152 $ 132 $ 1,795 $ 2,570 $ 227 $ 6,280 Purchased Credit Impaired (1) $ — $ — $ 54 $ 44 $ — $ — $ — $ 98 Loans receivable: Ending Balance $ 107,832 $ 7,115 $ 122,024 $ 20,736 $ 290,703 $ 205,847 $ 43,593 $ 797,850 Ending Balance: Individually evaluated for impairment $ 1,434 $ — $ 3,755 $ — $ 4,286 $ 3,441 $ — $ 12,916 Collectively evaluated for impairment $ 106,225 $ 7,115 $ 117,789 $ 20,534 $ 284,553 $ 202,406 $ 43,593 $ 782,215 Purchased Credit Impaired (1) $ 173 $ — $ 480 $ 202 $ 1,864 $ — $ — $ 2,719 (1) Purchased credit impaired loans are evaluated for impairment on an individual basis. December 31, 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 (102 ) — (144 ) — (44 ) (695 ) — (985 ) Recoveries 34 — 94 — 13 164 92 397 Provision 143 11 296 66 307 336 41 1,200 Ending Balance $ 600 $ 30 $ 1,021 $ 101 $ 1,416 $ 3,618 $ 458 $ 7,244 Ending Balance: Individually evaluated for impairment $ 504 $ — $ 129 $ — $ — $ 475 $ — $ 1,108 Collectively evaluated for impairment $ 96 $ 30 $ 838 $ 57 $ 1,416 $ 3,143 $ 458 $ 6,038 Purchased Credit Impaired (1) $ — $ — $ 54 $ 44 $ — $ — $ — $ 98 Loans receivable: Ending Balance $ 97,872 $ 8,897 $ 112,954 $ 26,058 $ 312,207 $ 185,276 $ 29,128 $ 772,392 Ending Balance: Individually evaluated for impairment $ 1,732 $ — $ 3,666 $ — $ 4,172 $ 2,226 $ — $ 11,796 Collectively evaluated for impairment $ 96,046 $ 8,897 $ 108,778 $ 25,829 $ 305,234 $ 183,050 $ 29,128 $ 756,962 Purchased Credit Impaired (1) $ 94 $ — $ 510 $ 229 $ 2,801 $ — $ — $ 3,634 (1) Purchased credit impaired loans are evaluated for impairment on an individual basis.
Summary of Credit Quality Indicators, Disaggregated by Class of Loan	Credit Quality Indicators June 30, 2016 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 102,205 $ 2,319 $ 1,775 $ 1,533 $ 107,832 Farmland 7,115 — — — 7,115 1-4 family residential 113,267 2,342 3,126 3,289 122,024 Multi-family residential 19,879 — 655 202 20,736 Nonfarm nonresidential 263,811 13,782 11,320 1,790 290,703 Commercial 173,740 22,302 7,511 2,294 205,847 Consumer 43,156 268 169 — 43,593 Total $ 723,173 $ 41,013 $ 24,556 $ 9,108 $ 797,850 December 31, 2015 Pass Special Mention Substandard Doubtful Total (Dollars in thousands) Real Estate Loans: Construction and land $ 93,740 $ 1,300 $ 1,094 $ 1,738 $ 97,872 Farmland 8,897 — — — 8,897 1-4 family residential 104,720 1,824 3,205 3,205 112,954 Multi-family residential 24,884 945 — 229 26,058 Nonfarm nonresidential 281,503 12,727 16,171 1,806 312,207 Commercial 157,734 22,222 4,341 979 185,276 Consumer 28,702 396 30 — 29,128 Total $ 700,180 $ 39,414 $ 24,841 $ 7,957 $ 772,392
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 June 30, 2016 and December 31, 2015. All loans greater than 90 days past due are generally placed on non-accrual status. Aged Analysis of Past Due Loans Receivable June 30, 2016 (Dollars in thousands) 30-59 Days 60-89 Days Greater Total Current Total Loans Recorded Real Estate Loans: Construction and land $ 385 $ — $ 196 $ 581 $ 107,251 $ 107,832 $ — Farmland — — — — 7,115 7,115 — 1-4 family residential 1,314 76 793 2,183 119,841 122,024 — Multi-family residential — — — — 20,736 20,736 — Nonfarm nonresidential 317 — 681 998 289,705 290,703 — Commercial — 246 — 246 205,601 205,847 — Consumer — — — — 43,593 43,593 — Total $ 2,016 $ 322 $ 1,670 $ 4,008 $ 793,842 $ 797,850 $ — December 31, 2015 (Dollars in thousands) 30-59 Days 60-89 Days Greater Total Current Total Loans Recorded Real Estate Loans: Construction and land $ — $ 10 $ 384 $ 394 $ 97,478 $ 97,872 $ — Farmland — — — — 8,897 8,897 — 1-4 family residential 289 132 1,086 1,507 111,447 112,954 — Multi-family residential — — — — 26,058 26,058 — Nonfarm nonresidential 1,185 178 309 1,672 310,535 312,207 — Commercial 78 13 — 91 185,185 185,276 — Consumer — — — — 29,128 29,128 — Total $ 1,552 $ 333 $ 1,779 $ 3,664 $ 768,728 $ 772,392 $ —
Summary of Information Pertaining to Impaired Loans	The following is a summary of information pertaining to impaired loans as of June 30, 2016 and December 31, 2015. 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 $138,000 and $303,000 for the six months ending June 30, 2016 and 2015, respectively. June 30, 2016 (Dollars in thousands) Recorded Unpaid Related Average With an allowance recorded: Real Estate Loans: Construction and land $ 1,288 $ 1,514 $ 505 $ 1,309 Farmland — — — — 1-4 family residential 340 373 180 304 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 1,831 1,851 317 1,141 Consumer — — — — $ 3,459 $ 3,738 $ 1,002 $ 2,754 With no allowance recorded: Real Estate Loans: Construction and land $ 146 $ 153 $ — $ 158 Farmland — — — — 1-4 family residential 3,415 3,983 — 3,432 Multi-family residential — — — — Nonfarm nonresidential 4,286 5,755 — 4,272 Other Loans: Commercial 1,610 2,721 — 1,820 Consumer — — — — $ 9,457 $ 12,612 $ — $ 9,682 Total Impaired Loans: Real Estate Loans: Construction and land $ 1,434 $ 1,667 $ 505 $ 1,467 Farmland — — — — 1-4 family residential 3,755 4,356 180 3,736 Multi-family residential — — — — Nonfarm nonresidential 4,286 5,755 — 4,272 Other Loans: Commercial 3,441 4,572 317 2,961 Consumer — — — — $ 12,916 $ 16,350 $ 1,002 $ 12,436 December 31, 2015 (Dollars in thousands) Recorded Unpaid Related Average With an allowance recorded: Real Estate Loans: Construction and land $ 1,336 $ 1,514 $ 504 $ 1,392 Farmland — — — — 1-4 family residential 305 313 129 78 Multi-family residential — — — — Nonfarm nonresidential — — — — Other Loans: Commercial 975 1,653 475 908 Consumer — — — — $ 2,616 $ 3,480 $ 1,108 $ 2,378 With no allowance recorded: Real Estate Loans: Construction and land $ 396 $ 401 $ — $ 1,530 Farmland — — — — 1-4 family residential 3,361 3,898 — 1,933 Multi-family residential — — — — Nonfarm nonresidential 4,172 5,588 — 4,062 Other Loans: Commercial 1,251 1,255 — 3,368 Consumer — — — 14 $ 9,180 $ 11,142 $ — $ 10,907 Total Impaired Loans: Real Estate Loans: Construction and land $ 1,732 $ 1,915 $ 504 $ 2,922 Farmland — — — — 1-4 family residential 3,666 4,211 129 2,011 Multi-family residential — — — — Nonfarm nonresidential 4,172 5,588 — 4,062 Other Loans: Commercial 2,226 2,908 475 4,276 Consumer — — — 14 $ 11,796 $ 14,622 $ 1,108 $ 13,285
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 at Acquisition $ 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 June 30, 2016. Purchased (Dollars in thousands) Carrying amount - April 1, 2015 (acquisition) $ 4,919 Payments received, net of discounts realized (469 ) Charge-offs (204 ) Transfer to Other Real Estate (612 ) Carrying amount - December 31, 2015 3,634 Payments received, net of discounts realized (502 ) Charge-offs (263 ) Transfer to Other Real Estate (150 ) Carrying amount - June 30, 2016 $ 2,719
Summary of Informative Data Regarding Loan Modifications	The following tables present informative data regarding loan modifications occurring as of June 30, 2016 and December 31, 2015. The Bank had $54,000 in troubled debt restructurings that had subsequently defaulted during the year ended December 31, 2015, and none that subsequently defaulted during the six months ended June 30, 2016. Modifications as of June 30, 2016: Number Pre-Modification Post-Modification (Dollars in thousands) Troubled Debt Restructuring Real Estate Loans: 1-4 family residential 5 $ 1,568 $ 907 Nonfarm nonresidential 3 5,143 3,521 Other Loans: Commercial 4 3,294 2,690 Total Loans 12 $ 10,005 $ 7,118 Modifications as of December 31, 2015: Number Pre-Modification Post-Modification (Dollars in thousands) Troubled Debt Restructuring Real Estate Loans: 1-4 family residential 5 $ 1,568 $ 1,008 Nonfarm nonresidential 3 5,143 3,623 Other Loans: Commercial 3 1,736 1,234 Total Loans 11 $ 8,447 $ 5,865

Fair Value of Financial Instr22

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 and December 31, 2015. The Company did not record any liabilities at fair value for which measurement of the fair value was made on a recurring basis. Fair Value Quoted Prices in Significant Significant (Dollars in thousands) June 30, 2016 Available for Sale: U.S. Government Agency Securities $ 6,887 $ — $ 6,887 $ — Corporate Securities 11,035 — 11,035 — Mortgage-Backed Securities 114,788 — 114,788 — Municipal Securities 74,157 — 74,157 — Other Securities 661 — 661 — Total $ 207,528 $ — $ 207,528 $ — December 31, 2015 Available for Sale: U.S. Government Agency Securities $ 13,667 $ — $ 13,667 $ — Corporate Securities 11,072 — 11,072 — Mortgage-Backed Securities 119,070 — 119,070 — Municipal Securities 66,441 — 66,441 — Other Securities 607 — 607 — Total $ 210,857 $ — $ 210,857 $ —
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) June 30, 2016 Assets: Impaired Loans $ 14,535 $ — $ 14,535 $ — Repossessed Assets 1,919 — 1,919 — Total $ 16,454 $ — $ 16,454 $ — December 31, 2015 Assets: Impaired Loans $ 14,224 $ — $ 14,224 $ — Repossessed Assets 2,033 — 2,033 — Total $ 16,257 $ — $ 16,257 $ —
Schedule of Estimated Fair Values of Banks Financial Instruments	The estimated approximate fair values of the Bank’s financial instruments as of June 30, 2016 and December 31, 2015 are as follows: Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) June 30, 2016 Financial Assets: Cash and Short-Term Investments $ 116,768 $ 116,768 $ 116,768 $ — $ — Securities 207,528 207,528 — 207,528 — Loans - Net 790,470 787,596 — — 787,596 Cash Value of BOLI 22,269 22,269 — 22,269 — Other Equity Securities 6,181 6,181 — — 6,181 $ 1,143,216 $ 1,140,342 $ 116,768 $ 229,797 $ 793,777 Financial Liabilities: Deposits $ 998,658 $ 984,769 $ — $ — $ 984,769 Borrowings 53,650 53,634 — 53,634 — $ 1,052,308 $ 1,038,403 $ — $ 53,634 $ 984,769 Carrying Total Quoted Prices in Significant Significant (Dollars in thousands) December 31, 2015 Financial Assets: Cash and Short-Term Investments $ 43,407 $ 43,407 $ 43,407 $ — $ — Securities 210,857 210,857 — 210,857 — Loans - Net 765,148 761,241 — — 761,241 Cash Value of BOLI 22,339 22,339 — 22,339 — Other Equity Securities 5,350 5,350 — — 5,350 $ 1,047,101 $ 1,043,194 $ 43,407 $ 233,196 $ 766,591 Financial Liabilities: Deposits $ 904,236 $ 897,771 $ — $ — $ 897,771 Borrowings 54,579 54,561 — 54,561 — $ 958,815 $ 952,332 $ — $ 54,561 $ 897,771

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016BankingCentersOffice
Basis Of Presentation [Abstract]
Number of banking centers the company provides services | BankingCenters	16
Number of office	1
Number of wealth solutions office	1

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail)	Mar. 31, 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	6 Months Ended
	Jun. 30, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)
Net Assets Acquired:
Goodwill Resulting from Merger	$ 6,824	$ 3,376
American Gateway Financial Corporation [Member]
Purchase Price:
AGFC Shares Outstanding | 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 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	12,867
Total Purchase Price	47,857
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	7,395
Cash Value of Life Insurance	4,326
Other Real Estate Owned	593
Core Deposit Intangible	2,762
Other Assets	6,375
Total Assets	371,521
Noninterest Bearing Deposits	80,865
Interest Bearing Deposits	202,442
Total Deposits	283,307
Borrowings	45,509
Other Liabilities	1,672
Total Liabilities	330,488
Net Assets Acquired	41,033
Goodwill Resulting from Merger	$ 6,824

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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net Income Available to Common Shares	$ 841	$ 1,023	$ 2,245	$ 2,156
Weighted Average Common Shares Outstanding	7,037,413	7,196,883	7,037,207	6,261,103
Dilutive Effect of Stock Options and Warrants	311,308	293,600	311,308	293,600
Weighted Average Dilutive Common Shares	7,348,721	7,490,483	7,348,515	6,554,703
Basic Earnings Per Common Share From Net Income Available to Common Shares	$ 0.12	$ 0.14	$ 0.32	$ 0.34
Diluted Earnings Per Common Share From Net Income Available to Common Shares	$ 0.11	$ 0.14	$ 0.31	$ 0.33

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 206,292	$ 212,053
Gross Unrealized Gains	1,871	956
Gross Unrealized Losses	635	2,152
Fair Value	207,528	210,857
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,771	13,656
Gross Unrealized Gains	116	43
Gross Unrealized Losses		32
Fair Value	6,887	13,667
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,162	11,177
Gross Unrealized Losses	127	105
Fair Value	11,035	11,072
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	114,769	120,599
Gross Unrealized Gains	228	39
Gross Unrealized Losses	209	1,568
Fair Value	114,788	119,070
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	72,656	65,679
Gross Unrealized Gains	1,527	874
Gross Unrealized Losses	26	112
Fair Value	74,157	66,441
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	934	942
Gross Unrealized Losses	273	335
Fair Value	$ 661	$ 607

Securities - Summary of Securit

Securities - Summary of Securities with Gross Unrealized Losses and Fair Values (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	$ 27,702	$ 125,279
Gross Unrealized Losses, Less Than 12 Months	68	1,209
Fair Value, 12 Months or Greater	57,924	26,491
Gross Unrealized Losses, 12 Months or Greater	567	943
Fair Value	85,626	151,770
Gross Unrealized Losses	635	2,152
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months		8,840
Gross Unrealized Losses, Less Than 12 Months		32
Fair Value		8,840
Gross Unrealized Losses		32
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	4,526	11,072
Gross Unrealized Losses, Less Than 12 Months	21	105
Fair Value, 12 Months or Greater	6,510
Gross Unrealized Losses, 12 Months or Greater	106
Fair Value	11,036	11,072
Gross Unrealized Losses	127	105
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	17,346	91,384
Gross Unrealized Losses, Less Than 12 Months	23	1,029
Fair Value, 12 Months or Greater	50,540	23,386
Gross Unrealized Losses, 12 Months or Greater	186	539
Fair Value	67,886	114,770
Gross Unrealized Losses	209	1,568
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	5,830	13,983
Gross Unrealized Losses, Less Than 12 Months	24	43
Fair Value, 12 Months or Greater	213	2,498
Gross Unrealized Losses, 12 Months or Greater	2	69
Fair Value	6,043	16,481
Gross Unrealized Losses	26	112
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, 12 Months or Greater	661	607
Gross Unrealized Losses, 12 Months or Greater	273	335
Fair Value	661	607
Gross Unrealized Losses	$ 273	$ 335

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Fair Values of Securities Available for Sale by Contractual Maturity (Detail) $ in Thousands	Jun. 30, 2016USD ($)
Investments, Debt and Equity Securities [Abstract]
Less Than One Year, Amortized cost	$ 2,818
One to Five Years, Amortized cost	44,374
Over Five to Ten Years, Amortized cost	53,195
Over Ten Years, Amortized cost	105,905
Total, Amortized cost	206,292
Less Than One Year, Fair Value	2,827
One to Five Years, Fair Value	44,910
Over Five to Ten Years, Fair Value	53,743
Over Ten Years, Fair Value	106,048
Total, Fair Value	$ 207,528

Loans and the Allowance for L30

Loans and the Allowance for Loan Losses - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	$ 797,850	$ 772,392
Allowance for loan losses	(7,380)	(7,244)	$ (6,632)
Net loans	790,470	765,148
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	107,832	97,872
Allowance for loan losses	(858)	(600)	(525)
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	7,115	8,897
Allowance for loan losses	(51)	(30)	(19)
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	290,703	312,207
Allowance for loan losses	(1,795)	(1,416)	(1,140)
Residential Portfolio Segment [Member] | Real Estate Residential One To Four Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	122,024	112,954
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	20,736	26,058
Allowance for loan losses	(176)	(101)	(35)
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	205,847	185,276
Allowance for loan losses	(2,887)	(3,618)	(3,813)
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans held for investment	43,593	29,128
Allowance for loan losses	$ (227)	$ (458)	$ (325)

Loans and the Allowance for L31

Loans and the Allowance for Loan Losses - Additional Information (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Apr. 01, 2015
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan origination fees	$ 800,000		$ 740,000
Loans and leases receivable reclassified from overdraft	326,000		150,000
Unpaid principal balances of mortgages and other loans serviced	58,000,000		44,700,000
Interest income recognized for impaired loans	138,000,000	$ 303,000,000
Troubled debt restructurings subsequently defaulted	0		54,000,000
American Gateway Financial Corporation [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing loans	76,900,000		93,100,000	$ 142,800,000
Performing loans estimated fair value				$ 138,100,000
Unaccreted purchase discount	$ 2,700,000		$ 3,200,000

Loans and the Allowance for L32

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		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			$ 7,244	$ 6,632	$ 6,632
Allowance for credit losses, Charge-offs			(852)		(985)
Allowance for credit losses, Recoveries			168		397
Allowance for credit losses, Provision	$ 150	$ 150	820	300	1,200
Allowance for credit losses, Ending Balance	7,380		7,380		7,244
Allowance for credit losses, Individually evaluated for impairment	1,002		1,002		1,108
Allowance for credit losses, Collectively evaluated for impairment	6,280		6,280		6,038
Allowance for credit losses, Purchased Credit Impaired	98		98		98
Loans receivable, Ending Balance	797,850		797,850		772,392
Loans receivable, Individually evaluated for impairment	12,916		12,916		11,796
Loans receivable, Collectively evaluated for impairment	782,215		782,215		756,962
Loans receivable, Purchased Credit Impaired	2,719		2,719		3,634
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			600	525	525
Allowance for credit losses, Charge-offs			(2)		(102)
Allowance for credit losses, Recoveries			9		34
Allowance for credit losses, Provision			251		143
Allowance for credit losses, Ending Balance	858		858		600
Allowance for credit losses, Individually evaluated for impairment	505		505		504
Allowance for credit losses, Collectively evaluated for impairment	353		353		96
Loans receivable, Ending Balance	107,832		107,832		97,872
Loans receivable, Individually evaluated for impairment	1,434		1,434		1,732
Loans receivable, Collectively evaluated for impairment	106,225		106,225		96,046
Loans receivable, Purchased Credit Impaired	173		173		94
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			30	19	19
Allowance for credit losses, Provision			21		11
Allowance for credit losses, Ending Balance	51		51		30
Allowance for credit losses, Collectively evaluated for impairment	51		51		30
Loans receivable, Ending Balance	7,115		7,115		8,897
Loans receivable, Collectively evaluated for impairment	7,115		7,115		8,897
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			1,416	1,140	1,140
Allowance for credit losses, Charge-offs			(361)		(44)
Allowance for credit losses, Recoveries			1		13
Allowance for credit losses, Provision			739		307
Allowance for credit losses, Ending Balance	1,795		1,795		1,416
Allowance for credit losses, Collectively evaluated for impairment	1,795		1,795		1,416
Loans receivable, Ending Balance	290,703		290,703		312,207
Loans receivable, Individually evaluated for impairment	4,286		4,286		4,172
Loans receivable, Collectively evaluated for impairment	284,553		284,553		305,234
Loans receivable, Purchased Credit Impaired	1,864		1,864		2,801
Residential Portfolio Segment [Member] | Real Estate 1-4 Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			1,021	775	775
Allowance for credit losses, Charge-offs			(99)		(144)
Allowance for credit losses, Recoveries			95		94
Allowance for credit losses, Provision			369		296
Allowance for credit losses, Ending Balance	1,386		1,386		1,021
Allowance for credit losses, Individually evaluated for impairment	180		180		129
Allowance for credit losses, Collectively evaluated for impairment	1,152		1,152		838
Allowance for credit losses, Purchased Credit Impaired	54		54		54
Loans receivable, Ending Balance	122,024		122,024		112,954
Loans receivable, Individually evaluated for impairment	3,755		3,755		3,666
Loans receivable, Collectively evaluated for impairment	117,789		117,789		108,778
Loans receivable, Purchased Credit Impaired	480		480		510
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			101	35	35
Allowance for credit losses, Provision			75		66
Allowance for credit losses, Ending Balance	176		176		101
Allowance for credit losses, Collectively evaluated for impairment	132		132		57
Allowance for credit losses, Purchased Credit Impaired	44		44		44
Loans receivable, Ending Balance	20,736		20,736		26,058
Loans receivable, Collectively evaluated for impairment	20,534		20,534		25,829
Loans receivable, Purchased Credit Impaired	202		202		229
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			3,618	3,813	3,813
Allowance for credit losses, Charge-offs			(390)		(695)
Allowance for credit losses, Recoveries			30		164
Allowance for credit losses, Provision			(371)		336
Allowance for credit losses, Ending Balance	2,887		2,887		3,618
Allowance for credit losses, Individually evaluated for impairment	317		317		475
Allowance for credit losses, Collectively evaluated for impairment	2,570		2,570		3,143
Loans receivable, Ending Balance	205,847		205,847		185,276
Loans receivable, Individually evaluated for impairment	3,441		3,441		2,226
Loans receivable, Collectively evaluated for impairment	202,406		202,406		183,050
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, Beginning balance			458	$ 325	325
Allowance for credit losses, Recoveries			33		92
Allowance for credit losses, Provision			(264)		41
Allowance for credit losses, Ending Balance	227		227		458
Allowance for credit losses, Collectively evaluated for impairment	227		227		458
Loans receivable, Ending Balance	43,593		43,593		29,128
Loans receivable, Collectively evaluated for impairment	$ 43,593		$ 43,593		$ 29,128

Loans and the Allowance for L33

Loans and the Allowance for Loan Losses - Summary of Credit Quality Indicators, Disaggregated by Class of Loan (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	$ 797,850	$ 772,392
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	107,832	97,872
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	7,115	8,897
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	290,703	312,207
Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	122,024	112,954
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	20,736	26,058
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	205,847	185,276
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	43,593	29,128
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	723,173	700,180
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	102,205	93,740
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	7,115	8,897
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	263,811	281,503
Pass [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	113,267	104,720
Pass [Member] | Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	19,879	24,884
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	173,740	157,734
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	43,156	28,702
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	41,013	39,414
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	2,319	1,300
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	13,782	12,727
Special Mention [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	2,342	1,824
Special Mention [Member] | Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators		945
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	22,302	22,222
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	268	396
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	24,556	24,841
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	1,775	1,094
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	11,320	16,171
Substandard [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	3,126	3,205
Substandard [Member] | Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	655
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	7,511	4,341
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	169	30
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	9,108	7,957
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	1,533	1,738
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	1,790	1,806
Doubtful [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	3,289	3,205
Doubtful [Member] | Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	202	229
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit quality indicators	$ 2,294	$ 979

Loans and the Allowance for L34

Loans and the Allowance for Loan Losses - Summary of Aged Analysis of Past Due Loans Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 4,008	$ 3,664
Current	793,842	768,728
Total Loans Receivables	797,850	772,392
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	581	394
Current	107,251	97,478
Total Loans Receivables	107,832	97,872
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,115	8,897
Total Loans Receivables	7,115	8,897
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	998	1,672
Current	289,705	310,535
Total Loans Receivables	290,703	312,207
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,183	1,507
Current	119,841	111,447
Total Loans Receivables	122,024	112,954
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	20,736	26,058
Total Loans Receivables	20,736	26,058
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	246	91
Current	205,601	185,185
Total Loans Receivables	205,847	185,276
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	43,593	29,128
Total Loans Receivables	43,593	29,128
Recorded Investment Over 90 Days Past Due and Still Accruing	0	0
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,016	1,552
30-59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	385
30-59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	317	1,185
30-59 Days Past Due [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,314	289
30-59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		78
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	322	333
60-89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10
60-89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		178
60-89 Days Past Due [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	76	132
60-89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	246	13
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,670	1,779
Greater Than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	196	384
Greater Than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	681	309
Greater Than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 793	$ 1,086

Loans and the Allowance for L35

Loans and the Allowance for Loan Losses - Summary of Information Pertaining to Impaired Loans (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	$ 3,459	$ 2,616
Unpaid Principal Balance, with an allowance recorded	3,738	3,480
Related Allowance	1,002	1,108
Average Recorded Investment, with an allowance recorded	2,754	2,378
Recorded Investment, with no allowance recorded	9,457	9,180
Unpaid Principal Balance, with no allowance recorded	12,612	11,142
Average Recorded Investment, with no allowance recorded	9,682	10,907
Recorded Investment	12,916	11,796
Unpaid Principal Balance	16,350	14,622
Related Allowance	1,002	1,108
Average Recorded Investment	12,436	13,285
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	1,288	1,336
Unpaid Principal Balance, with an allowance recorded	1,514	1,514
Related Allowance	505	504
Average Recorded Investment, with an allowance recorded	1,309	1,392
Recorded Investment, with no allowance recorded	146	396
Unpaid Principal Balance, with no allowance recorded	153	401
Average Recorded Investment, with no allowance recorded	158	1,530
Recorded Investment	1,434	1,732
Unpaid Principal Balance	1,667	1,915
Related Allowance	505	504
Average Recorded Investment	1,467	2,922
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with no allowance recorded	4,286	4,172
Unpaid Principal Balance, with no allowance recorded	5,755	5,588
Average Recorded Investment, with no allowance recorded	4,272	4,062
Recorded Investment	4,286	4,172
Unpaid Principal Balance	5,755	5,588
Average Recorded Investment	4,272	4,062
Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	340	305
Unpaid Principal Balance, with an allowance recorded	373	313
Related Allowance	180	129
Average Recorded Investment, with an allowance recorded	304	78
Recorded Investment, with no allowance recorded	3,415	3,361
Unpaid Principal Balance, with no allowance recorded	3,983	3,898
Average Recorded Investment, with no allowance recorded	3,432	1,933
Recorded Investment	3,755	3,666
Unpaid Principal Balance	4,356	4,211
Related Allowance	180	129
Average Recorded Investment	3,736	2,011
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, with an allowance recorded	1,831	975
Unpaid Principal Balance, with an allowance recorded	1,851	1,653
Related Allowance	317	475
Average Recorded Investment, with an allowance recorded	1,141	908
Recorded Investment, with no allowance recorded	1,610	1,251
Unpaid Principal Balance, with no allowance recorded	2,721	1,255
Average Recorded Investment, with no allowance recorded	1,820	3,368
Recorded Investment	3,441	2,226
Unpaid Principal Balance	4,572	2,908
Related Allowance	317	475
Average Recorded Investment	$ 2,961	4,276
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment, with no allowance recorded		14
Average Recorded Investment		$ 14

Loans and the Allowance for L36

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 at Acquisition	$ 4,919

Loans and the Allowance for L37

Loans and the Allowance for Loan Losses - Summary of Changes in Carrying Amount of Purchased Impaired Credits (Detail) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Carrying amount, beginning balance	$ 3,634
Carrying amount, ending balance	2,719	$ 3,634
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	3,634	4,919
Payments received, net of discounts realized	(502)	(469)
Charge-offs	(263)	(204)
Transfer to Other Real Estate	(150)	(612)
Carrying amount, ending balance	$ 2,719	$ 3,634

Loans and the Allowance for L38

Loans and the Allowance for Loan Losses - Summary of Informative Data Regarding Loan Modifications (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016USD ($)Contracts	Dec. 31, 2015USD ($)Contracts
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	12	11
Pre-Modification Outstanding Recorded Investment	$ 10,005	$ 8,447
Post-Modification Outstanding Recorded Investment	$ 7,118	$ 5,865
Residential Portfolio Segment [Member] | 1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	5	5
Pre-Modification Outstanding Recorded Investment	$ 1,568	$ 1,568
Post-Modification Outstanding Recorded Investment	$ 907	$ 1,008
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	3	3
Pre-Modification Outstanding Recorded Investment	$ 5,143	$ 5,143
Post-Modification Outstanding Recorded Investment	$ 3,521	$ 3,623
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contracts	4	3
Pre-Modification Outstanding Recorded Investment	$ 3,294	$ 1,736
Post-Modification Outstanding Recorded Investment	$ 2,690	$ 1,234

Fair Value of Financial Instr39

Fair Value of Financial Instruments - Additional Information (Detail)	Jun. 30, 2016USD ($)
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	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	$ 207,528	$ 210,857
U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	6,887	13,667
Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	11,035	11,072
Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	114,788	119,070
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	74,157	66,441
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	661	607
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	207,528	210,857
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale Securities	207,528	210,857
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	6,887	13,667
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	11,035	11,072
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	114,788	119,070
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	74,157	66,441
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	661	607
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	207,528	210,857
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	6,887	13,667
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	11,035	11,072
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	114,788	119,070
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	74,157	66,441
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	$ 661	$ 607

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	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 16,454	$ 16,257
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	14,535	14,224
Repossessed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,919	2,033
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	16,454	16,257
Significant Other Observable Inputs (Level 2) [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	14,535	14,224
Significant Other Observable Inputs (Level 2) [Member] | Repossessed Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 1,919	$ 2,033

Fair Value of Financial Instr42

Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Banks Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	$ 207,528	$ 210,857
Other Equity Securities	6,181	5,350
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Short-Term Investments	116,768	43,407
Securities	207,528	210,857
Loans - Net	790,470	765,148
Cash Value of BOLI	22,269	22,339
Other Equity Securities	6,181	5,350
Total Assets	1,143,216	1,047,101
Deposits	998,658	904,236
Borrowings	53,650	54,579
Total Liabilities	1,052,308	958,815
Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Short-Term Investments	116,768	43,407
Securities	207,528	210,857
Loans - Net	787,596	761,241
Cash Value of BOLI	22,269	22,339
Other Equity Securities	6,181	5,350
Total Assets	1,140,342	1,043,194
Deposits	984,769	897,771
Borrowings	53,634	54,561
Total Liabilities	1,038,403	952,332
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	116,768	43,407
Total Assets	116,768	43,407
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	207,528	210,857
Cash Value of BOLI	22,269	22,339
Total Assets	229,797	233,196
Borrowings	53,634	54,561
Total Liabilities	53,634	54,561
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans - Net	787,596	761,241
Other Equity Securities	6,181	5,350
Total Assets	793,777	766,591
Deposits	984,769	897,771
Total Liabilities	$ 984,769	$ 897,771