Franklin Financial Network (FSB) 10-Q 13 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 09, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	FSB
Entity Registrant Name	FRANKLIN FINANCIAL NETWORK INC.
Entity Central Index Key	1,407,067
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		10,525,680

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from financial institutions	$ 47,658	$ 49,347
Certificates of deposit at other financial institutions	250	250
Securities available for sale	624,420	395,705
Securities held to maturity (fair value 2015-$134,028 and 2014-$53,741)	132,134	53,332
Loans held for sale, at fair value	14,666	18,462
Loans	1,123,826	787,188
Allowance for loan losses	(9,744)	(6,680)
Net loans	1,114,082	780,508
Restricted equity securities, at cost	7,691	5,349
Premises and equipment, net	9,360	9,664
Accrued interest receivable	6,108	3,545
Bank owned life insurance	22,452	11,664
Deferred tax asset	5,980	6,780
Buildings held for sale		4,080
Foreclosed assets	206	715
Servicing rights, net	3,415	3,053
Goodwill	9,124	9,124
Core deposit intangible, net	2,199	2,698
Other assets	2,793	1,551
Total assets	2,002,538	1,355,827
Deposits
Non-interest bearing	177,452	150,337
Interest bearing	1,537,142	1,021,896
Total deposits	1,714,594	1,172,233
Federal funds purchased and repurchase agreements	37,618	39,078
Federal Home Loan Bank advances	57,000	19,000
Accrued interest payable	587	421
Other liabilities	5,129	3,296
Total liabilities	1,814,928	1,234,028
Shareholders' equity
Senior non-cumulative preferred stock, no par value, $10,000 liquidation value: Series A, 1,000,000 shares authorized; 10,000 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	10,000	10,000
Common stock, no par value; 20,000,000 shares authorized; 10,524,630 and 7,756,411 shares issued and outstanding at September 30, 2015 and December 31 2014, respectively	146,645	94,251
Retained earnings	26,713	15,372
Accumulated other comprehensive income	4,252	2,176
Total shareholders' equity	187,610	121,799
Total liabilities and shareholders' equity	$ 2,002,538	$ 1,355,827

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Held-to-maturity securities, fair value	$ 134,028	$ 53,741
Preferred stock, par value	$ 0	$ 0
Preferred stock, liquidation value	$ 10,000	$ 10,000
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	10,000	10,000
Preferred stock, shares outstanding	10,000	10,000
Common stock, par value	$ 0	$ 0
Common stock shares authorized	20,000,000	20,000,000
Common stock shares issued	10,524,630	7,756,411
Common stock, share outstanding	10,524,630	7,756,411

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income and dividends
Loans, including fees	$ 14,744	$ 10,168	$ 38,071	$ 22,466
Securities:
Taxable	3,462	2,395	9,084	6,932
Tax-exempt	966	20	1,155	60
Dividends on restricted equity securities	100	84	250	175
Federal funds sold and other	29	25	80	57
Total interest income	19,301	12,692	48,640	29,690
Interest expense
Deposits	2,417	1,446	5,963	3,808
Federal funds purchased and repurchase agreements	69	39	232	123
Federal Home Loan Bank advances	79	80	225	189
Total interest expense	2,565	1,565	6,420	4,120
Net interest income	16,736	11,127	42,220	25,570
Provision for loan losses	1,724	664	3,154	1,489
Net interest income after provision for loan losses	15,012	10,463	39,066	24,081
Noninterest income
Service charges on deposit accounts	44	13	78	37
Other service charges and fees	679	600	1,987	1,149
Net gains on sale of loans	2,463	1,875	5,573	4,226
Loan servicing fees, net of amortization of servicing assets	84	73	187	173
Gain on sales and calls of securities	5	22	529	93
Net gain (loss) on foreclosed assets	3	(3)	30	28
Wealth management	327	287	914	364
Other	193	407	566	1,055
Total noninterest income	3,798	3,274	9,864	7,125
Noninterest expense
Salaries and employee benefits	6,208	6,144	17,960	13,494
Occupancy and equipment	1,683	1,443	4,961	3,238
FDIC assessment expense	362	181	792	420
Marketing	277	224	695	470
Professional fees	516	961	1,382	1,594
Amortization of core deposit intangible	160	184	499	184
Indirect expenses related to public offering			314
Other	1,647	1,252	4,443	2,559
Total noninterest expense	10,853	10,389	31,046	21,959
Income before income tax expense	7,957	3,348	17,884	9,247
Income tax expense	2,807	1,333	6,468	3,668
Net income	5,150	2,015	11,416	5,579
Dividends paid on Series A preferred stock	(25)	(25)	(75)	(75)
Net income available to common shareholders	$ 5,125	$ 1,990	$ 11,341	$ 5,504
Earnings per share:
Basic	$ 0.49	$ 0.26	$ 1.17	$ 0.94
Diluted	$ 0.46	$ 0.25	$ 1.12	$ 0.91

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 5,150	$ 2,015	$ 11,416	$ 5,579
Unrealized gains/losses on securities:
Unrealized holding gain (loss) arising during the period	7,871	(623)	4,006	7,445
Reclassification adjustment for gains included in net income	(5)	(22)	(529)	(93)
Net unrealized gains (losses)	7,866	(645)	3,477	7,352
Tax effect	(3,090)	247	(1,401)	(2,815)
Total other comprehensive income (loss)	4,776	(398)	2,076	4,537
Comprehensive income	$ 9,926	$ 1,617	$ 13,492	$ 10,116

Condensed Consolidated Statemen

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Series A Preferred Stock [Member]	MidSouth Bank [Member]	Common Stock [Member]	Common Stock [Member]Initial Public Offering [Member]	Common Stock [Member]MidSouth Bank [Member]	Retained Earnings [Member]	Retained Earnings [Member]Series A Preferred Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2013	$ 65,163	$ 10,000		$ 52,638			$ 7,058		$ (4,533)
Beginning balance,shares at Dec. 31, 2013				4,862,875
Issuance of restricted stock, net of forfeitures				83,725
Exercise of common stock options	56			$ 56
Stock based compensation expense, net of forfeitures	457			$ 457
Exercise of common stock options, number of shares			137,280	6,508		137,280
Dividends paid on Series A preferred stock	(75)							$ (75)
Stock issued in conjunction with 401(k) employer match, net of distributions	275			$ 275
Stock issued in conjunction with 401(k) employer match, net of distributions, number of shares				20,345
Stock and stock options (137,280 options) issued related to MidSouth Bank acquisition, net of stock issuance costs of $514	40,462			$ 40,462
Common stock, shares						2,766,191
Net income	5,579						5,579
Other comprehensive income	4,537								4,537
Ending balance at Sep. 30, 2014	116,454	10,000		$ 93,888			12,562		4
Ending balance,shares at Sep. 30, 2014				7,739,644
Beginning balance at Dec. 31, 2014	121,799	10,000		$ 94,251			15,372		2,176
Beginning balance,shares at Dec. 31, 2014				7,756,411
Issuance of restricted stock, net of forfeitures				28,229
Exercise of common stock options	780			$ 780
Stock based compensation expense, net of forfeitures	$ 619			$ 619
Exercise of common stock options, number of shares	93,754			80,331
Exercise of common stock warrants	$ 60			$ 60
Common stock warrants exercised, shares				4,970
Dividends paid on Series A preferred stock	(75)							$ (75)
Common stock, shares					2,640,000
Stock issued in conjunction with 401(k) employer match, net of distributions	365			$ 365
Stock issued in conjunction with 401(k) employer match, net of distributions, number of shares				14,689
Excess tax benefit from exercise of stock options	147			$ 147
Net income	11,416						11,416
Other comprehensive income	2,076								2,076
Ending balance at Sep. 30, 2015	187,610	$ 10,000		$ 146,645			$ 26,713		$ 4,252
Ending balance,shares at Sep. 30, 2015				10,524,630
Stock issued related to initial public offering, net of stock issuance costs of $5,017	$ 50,423			$ 50,423

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Proceeds from issuance of Stock options	93,754
Proceeds from issuance of common stock, net of offering costs	$ 5,017
MidSouth Bank [Member]
Proceeds from issuance of Stock options		137,280
Proceeds from issuance of common stock, net of offering costs		$ 514
Common Stock [Member]
Proceeds from issuance of Stock options	80,331	6,508
Common Stock [Member] | MidSouth Bank [Member]
Proceeds from issuance of Stock options		137,280
Proceeds from issuance of common stock, net of offering costs		$ 514
Initial Public Offering [Member]
Stock issued related to initial public offering, stock issuance costs	$ 5,017
Initial Public Offering [Member] | Common Stock [Member]
Stock issued related to initial public offering, stock issuance costs	$ 5,017

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 11,416	$ 5,579
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization on premises and equipment	996	616
Accretion of purchase accounting adjustments	(1,551)	(831)
Net amortization of securities	3,426	1,928
Amortization of loan servicing right asset	644	547
Amortization of core deposit intangible	499	184
Provision for loan losses	3,154	1,489
Excess tax benefit related to the exercise of stock options	(147)
Origination of loans held for sale	(236,831)	(191,142)
Proceeds from sale of loans held for sale	245,194	186,618
Net gain on sale of loans	(5,573)	(4,226)
Gain on sale of available for sale securities	(380)	(93)
Gain on call of held to maturity securities	(149)
Income from bank owned life insurance	(444)	(203)
(Gain) loss on sale of foreclosed assets	(22)	(28)
Stock-based compensation expense	619	457
Compensation expense related to common stock issued to 401(k) plan	356	294
Recognition of deferred gain on sale of loans	(27)	(31)
Recognition of deferred gain on sale of foreclosed assets	(8)	(2)
Net change in:
Accrued interest receivable and other assets	(4,406)	101
Accrued interest payable and other liabilities	2,190	(705)
Net cash from operating activities	18,956	552
Available for sale securities:
Sales	52,064	34,087
Purchases	(467,067)	(118,611)
Maturities, prepayments and calls	187,222	69,465
Held to maturity securities:
Purchases	(88,550)	(8,601)
Maturities, prepayments and calls	9,394	8,655
Net change in loans	(335,238)	(114,676)
Purchase of bank owned life insurance	(10,344)
Proceeds from sale of buildings held for sale	4,080
Purchase of restricted equity securities	(2,342)	(745)
Proceeds from sale of foreclosed assets	531	634
Purchases of premises and equipment, net	(692)	(2,941)
Net cash received from acquisition		12,197
Net cash from investing activities	(650,942)	(120,536)
Cash flows from financing activities
Increase in deposits	542,422	125,903
Increase (decrease) in federal funds purchased and repurchase agreements	(1,460)	9,054
Proceeds from Federal Home Loan Bank advances	157,000	15,000
Repayment of Federal Home Loan Bank advances	(119,000)	(11,000)
Proceeds from exercise of common stock warrants	60
Proceeds from exercise of common stock options, including excess tax benefit	927	56
Proceeds from issuance of common stock, net of offering costs	50,423	(514)
Dividends paid on preferred stock	(75)	(75)
Net cash from financing activities	630,297	138,424
Net change in cash and cash equivalents	(1,689)	18,440
Cash and cash equivalents at beginning of period	49,347	18,217
Cash and cash equivalents at end of period	47,658	36,657
Supplemental information:
Interest paid	6,254	3,905
Income taxes paid	$ 6,339	4,546
Non-cash supplemental information:
Transfers from loans to foreclosed assets		$ 1,315
Fair value of stock and stock options issued related to MidSouth Bank acquisition		40,976

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	NOTE 1—BASIS OF PRESENTATION The accompanying unaudited consolidated financial statements of Franklin Financial Network, Inc. (“FFN”), and its wholly owned subsidiaries, Franklin Synergy Bank and BCG Consulting Group, Inc. (“BCG”), together referred to as “the Company,” have been prepared in accordance with instructions to Form 10-Q and therefore do not include all information and footnotes necessary for a fair presentation of financial position, results of operations, and cash flows in conformity with U.S. generally accepted accounting principles (U.S. GAAP). All adjustments which are, in the opinion of management, necessary for a fair presentation of the results for the periods reported have been included as required by Regulation S-X, Rule 10-01. All such adjustments are of a normal recurring nature. It is suggested that these interim consolidated financial statements and notes be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 11, 2015.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisitions	NOTE 2—ACQUISITIONS Acquisition of MidSouth Bank On July 1, 2014 the Company completed the acquisition of MidSouth Bank (“MidSouth”), pursuant to the terms of the Agreement and Plan of Reorganization and Bank Merger (the “merger agreement”) dated November 19, 2013. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations At September 30, 2015, there were no circumstances or significant changes that have occurred since July 1, 2014 related to the acquisition of MidSouth that, in management’s assessment, would necessitate recording impairment of goodwill. In the acquisition, the Company purchased $184,345 of loans at fair value, net of $7,347, or 3.8%, estimated discount to the outstanding principal balance, representing 38.0% of the Company’s total loans at September 30, 2014. Of the total loans acquired, management identified loans totaling $5,527 as having credit deficiencies. All loans that were on non-accrual status and all loan relationships that were identified as substandard or impaired as of the acquisition date were considered by management to be credit-impaired and are accounted for pursuant to ASC Topic 310-30. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of July 1, 2014 for purchased credit-impaired (“PCI”) loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 8,510 Non-accretable difference (1,745 ) Cash flows expected to be collected 6,765 Accretable yield (1,238 ) Total purchased credit-impaired loans acquired $ 5,527 In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition had an intangible value. The Company applied ASC Topic 805, which prescribes the accounting for goodwill and other intangible assets such as core deposit intangibles, in a business combination. The Company determined the estimated fair value of the core deposit intangible asset totaled $3,060, which is being amortized utilizing an accelerated amortization method over an estimated economic life of 8.2 years. Through September 30, 2015, the Company has recorded amortization of core deposit intangibles totaling $861. Pro forma information Pro forma data for the nine-month period ended September 30, 2014 listed in the table below presents pro forma information as if the MidSouth acquisition occurred at the beginning of 2014. Because the MidSouth transaction closed on July 1, 2014, and its actual results are included in the Company’s actual operating results for the three-month periods ended September 30, 2014 and 2015 and for the nine-month period ended September 30, 2015, there is no pro forma information for those periods. Nine Months Ended Net interest income $ 31,619 Net income available to common shareholders 6,353 Earnings per share—basic $ 0.82 Earnings per share—diluted $ 0.80 Supplemental pro forma earnings for the nine months ended September 30, 2014 were adjusted to exclude acquisition-related costs that were incurred during the nine months ended September 30, 2014 of $2,112. Supplemental pro forma earnings for the nine months ended September 30, 2014 were adjusted to include discount accretion and premium amortization related to the fair value adjustments to acquisition date assets and liabilities, as appropriate. During the nine months ended September 30, 2014, the acquisition of MidSouth increased pro forma net interest income by approximately $6,049 and net income available to common shareholders by approximately $849.

Securities

Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Securities	NOTE 3—SECURITIES The following table summarizes the amortized cost and fair value of the available for sale securities portfolio at September 30, 2015 and December 31, 2014 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income. Amortized Gross Gross Fair September 30, 2015 U.S. government sponsored entities and agencies $ 14,211 $ 253 $ (46 ) $ 14,418 Mortgage-backed securities: residential 508,817 6,868 (1,086 ) 514,599 Mortgage-backed securities: commercial 20,169 161 — 20,330 State and political subdivisions 74,220 896 (43 ) 75,073 Total $ 617,417 $ 8,178 $ (1,175 ) $ 624,420 Amortized Gross Gross Fair December 31, 2014 U.S. government sponsored entities and agencies $ 30,070 $ 417 $ (314 ) $ 30,173 U.S. Treasury securities 20,000 — — 20,000 Mortgage-backed securities: residential 335,677 4,593 (1,203 ) 339,067 Mortgage-backed securities: commercial 6,432 33 — 6,465 Total $ 392,179 $ 5,043 $ (1,517 ) $ 395,705 The amortized cost and fair value of the held to maturity securities portfolio at September 30, 2015 and December 31, 2014 and the corresponding amounts of gross unrecognized gains and losses were as follows: Amortized Gross Gross Fair September 30, 2015 U.S. government sponsored entities and agencies $ 3,301 $ 13 $ (42 ) $ 3,272 Mortgage backed securities: residential 31,691 658 (318 ) 32,031 State and political subdivisions 97,142 1,605 (22 ) 98,725 Total $ 132,134 $ 2,276 $ (382 ) $ 134,028 Gross Gross Gross Fair December 31, 2014 U.S. government sponsored entities and agencies $ 5,550 $ 162 $ (87 ) $ 5,625 Mortgage backed securities: residential 38,587 555 (562 ) 38,580 State and political subdivisions 9,195 351 (10 ) 9,536 Total $ 53,332 $ 1,068 $ (659 ) $ 53,741 Sales and calls of available for sale securities were as follows: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Proceeds $ 19,776 $ 9,767 $ 54,064 $ 34,087 Gross gains 95 31 485 256 Gross losses (90 ) (9 ) (105 ) (163 ) Calls of held to maturity securities were as follows: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Proceeds $ — $ — $ 2,300 $ — Gross gains — — 149 — Gross losses — — — — The amortized cost and fair value of the investment securities portfolio are shown by contractual maturity. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. September 30, 2015 Amortized Fair Available for sale Three months or less $ — $ — Over three months through one year — — Over one year through five years — — Over five years through ten years 7,761 8,009 Over ten years 80,670 81,482 Mortgage-backed securities: residential 508,817 514,599 Mortgage-backed securities: commercial 20,169 20,330 Total $ 617,417 $ 624,420 Held to maturity Three months or less $ — $ — Over three months through one year — — Over one year through five years 1,307 1,366 Over five years through ten years 3,024 3,091 Over ten years 96,112 97,540 Mortgage-backed securities: residential 31,691 32,031 Total $ 132,134 $ 134,028 Securities pledged at September 30, 2015 and December 31, 2014 had a carrying amount of $467,080 and $366,764 and were pledged to secure public deposits and repurchase agreements. At September 30, 2015 and December 31, 2014, there were no holdings of securities of any one issuer, other than the U.S. government-sponsored entities and agencies, in an amount greater than 10% of shareholders’ equity. The following table summarizes the securities with unrealized and unrecognized losses at September 30, 2015 and December 31, 2014, aggregated by major security type and length of time in a continuous unrealized loss position: Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized September 30, 2015 Available for sale U.S. government sponsored entities and agencies $ — $ — $ 1,654 $ (46 ) $ 1,654 $ (46 ) Mortgage-backed securities: residential 77,224 (620 ) 26,253 (466 ) 103,477 (1,086 ) State and political subdivisions 2,981 (43 ) — — 2,981 (43 ) Total available for sale $ 80,205 $ (663 ) $ 27,907 $ (512 ) $ 108,112 $ (1,175 ) Less Than 12 Months 12 Months or Longer Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Held to maturity U.S. government sponsored entities and agencies $ 1,979 $ (21 ) $ 979 $ (21 ) $ 2,958 $ (42 ) Mortgage-backed securities: residential 1,800 (6 ) 5,690 (312 ) 7,490 (318 ) State and political subdivisions 4,671 (22 ) — — 4,671 (22 ) Total held to maturity $ 8,450 $ (49 ) $ 6,669 $ (333 ) $ 15,119 $ (382 ) Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized December 31, 2014 Available for sale U.S. government sponsored entities and agencies $ 9,999 $ (1 ) $ 8,232 $ (313 ) $ 18,231 $ (314 ) Mortgage-backed securities: residential 59,078 (323 ) 41,939 (880 ) 101,017 (1,203 ) Total available for sale $ 69,077 $ (324 ) $ 50,171 $ (1,193 ) $ 119,248 $ (1,517 ) Less Than 12 Months 12 Months or Longer Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Held to maturity U.S. government sponsored entities and agencies $ — $ — $ 2,913 $ (87 ) $ 2,913 $ (87 ) Mortgage-backed securities: residential 5,246 (25 ) 13,001 (537 ) 18,247 (562 ) State and political subdivisions 507 (1 ) 592 (9 ) 1,099 (10 ) Total held to maturity $ 5,753 $ (26 ) $ 16,506 $ (633 ) $ 22,259 $ (659 ) Unrealized losses on debt securities have not been recognized into income because the issuers bonds are of high credit quality (rated AA or higher), management does not intend to sell and it is likely that management will not be required to sell the securities prior to their anticipated recovery, and the decline in fair value is largely due to changes in interest rates and other market conditions. The fair value is expected to recover as the bonds approach maturity.

Loans

Loans	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans	NOTE 4—LOANS Loans at September 30, 2015 and December 31, 2014 were as follows: September 30, December 31, Loans that are not PCI loans Construction and land development $ 334,208 $ 239,225 Commercial real estate: Nonfarm, nonresidential 303,657 240,975 Other 9,478 5,377 Residential real estate: Closed-end 1-4 family 144,080 130,631 Other 104,371 83,129 Commercial and industrial 219,341 76,570 Consumer and other 6,893 8,025 Loans before net deferred loan fees 1,122,028 783,932 Deferred loan fees, net (2,115 ) (1,059 ) Total loans that are not PCI loans 1,119,913 782,873 PCI loans Construction and land development $ 77 $ 77 Commercial real estate: Nonfarm, nonresidential 1,452 1,798 Other — — Residential real estate: Closed-end 1-4 family 707 706 Other 2 108 Commercial and industrial 1,675 1,624 Consumer and other — 2 Total PCI loans 3,913 4,315 Allowance for loan losses (9,744 ) (6,680 ) Total loans, net of allowance for loan losses $ 1,114,082 $ 780,508 The following table presents the activity in the allowance for loan losses by portfolio segment for the three month periods ended September 30, 2015 and 2014: Construction Commercial Residential Commercial Consumer Total Three Months Ended September 30, 2015 Allowance for loan losses: Beginning balance $ 2,567 $ 2,321 $ 1,739 $ 1,324 $ 65 $ 8,016 Provision (credit) for loan losses 461 135 (71 ) 1,253 (54 ) 1,724 Loans charged-off — — (15 ) (15 ) (33 ) (63 ) Recoveries — — 6 — 61 67 Total ending allowance balance $ 3,028 $ 2,456 $ 1,659 $ 2,562 $ 39 $ 9,744 Three Months Ended September 30, 2014 Allowance for loan losses: Beginning balance $ 1,910 $ 1,740 $ 1,560 $ 508 $ 53 $ 5,771 Provision (credit) for loan losses 231 173 192 72 (4 ) 664 Loans charged-off — (540 ) (11 ) (4 ) — (555 ) Recoveries — — 3 — — 3 Total ending allowance balance $ 2,141 $ 1,373 $ 1,744 $ 576 $ 49 $ 5,883 There was $5 in allowance for loan losses for PCI loans for the three months ended September 30, 2015. There was no allowance for loan losses for the three months ended September 30, 2014. The following table presents the activity in the allowance for loan losses by portfolio segment for the nine-month periods ended September 30, 2015 and 2014: Construction Commercial Residential Commercial Consumer Total Nine Months Ended September 30, 2015 Allowance for loan losses: Beginning balance $ 2,690 $ 1,494 $ 1,791 $ 650 $ 55 $ 6,680 Provision (credit) for loan losses 338 962 (114 ) 1,927 41 3,154 Loans charged-off — — (32 ) (15 ) (121 ) (168 ) Recoveries — — 14 — 64 78 Total ending allowance balance $ 3,028 $ 2,456 $ 1,659 $ 2,562 $ 39 $ 9,744 Nine Months Ended September 30, 2014 Allowance for loan losses: Beginning balance $ 1,552 $ 1,511 $ 1,402 $ 337 $ 98 $ 4,900 Provision (credit) for loan losses 589 402 304 243 (49 ) 1,489 Loans charged-off — (540 ) (11 ) (4 ) — (555 ) Recoveries — — 49 — — 49 Total ending allowance balance $ 2,141 $ 1,373 $ 1,744 $ 576 $ 49 $ 5,883 There was $5 in allowance for loan losses for PCI loans for the nine months ended September 30, 2015. There was no allowance for loan losses for the nine months ended September 30, 2014. The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2015 and December 31, 2014. For purposes of this table, recorded investment in loans excludes accrued interest receivable and loan fees, net due to immateriality. Construction Commercial Residential Commercial Consumer Total September 30, 2015 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 80 $ — $ 80 Collectively evaluated for impairment 3,028 2,451 1,659 2,482 39 9,659 Purchased credit-impaired loans — 5 — — — 5 Total ending allowance balance $ 3,028 $ 2,456 $ 1,659 $ 2,562 $ 39 $ 9,744 Loans: Individually evaluated for impairment $ — $ 914 $ 709 $ 102 $ 25 $ 1,750 Collectively evaluated for impairment 334,208 312,221 247,742 219,239 6,868 1,120,278 Purchased credit-impaired loans 77 1,452 709 1,675 — 3,913 Total ending loans balance $ 334,285 $ 314,587 $ 249,160 $ 221,016 $ 6,893 $ 1,125,941 Construction Commercial Residential Commercial Consumer Total December 31, 2014 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 18 $ — $ 18 Collectively evaluated for impairment 2,690 1,494 1,791 632 55 6,662 Purchased credit-impaired loans — — — — — — Total ending allowance balance $ 2,690 $ 1,494 $ 1,791 $ 650 $ 55 $ 6,680 Loans: Individually evaluated for impairment $ — $ 835 $ 93 $ 18 $ — $ 946 Collectively evaluated for impairment 239,225 245,517 213,667 76,552 8,025 782,986 Purchased credit-impaired loans 77 1,798 814 1,624 2 4,315 Total ending loans balance $ 239,302 $ 248,150 $ 214,574 $ 78,194 $ 8,027 $ 788,247 Loans collectively evaluated for impairment reported at September 30, 2015 include certain loans acquired from MidSouth on July 1, 2014. The acquired loans were recorded at estimated fair value at date of acquisition, which included an estimated credit discount. On July 1, 2014, acquired non-PCI loans were recorded at an estimated fair value of $178,818, comprised of contractually unpaid principal totaling $183,832 net of estimated discounts totaling $5,014 which included both credit and interest rate discount components. At September 30, 2015, acquired non-PCI loans were recorded at $104,853, comprised of contractually unpaid principal totaling $107,563 net of discounts totaling $2,710. Management evaluated these loans for credit deterioration since acquisition and determined that no allowance for loan losses was necessary at September 30, 2015. The following table presents information related to impaired loans by class of loans as of September 30, 2015 and December 31, 2014: Unpaid Recorded Allowance for September 30, 2015 With no allowance recorded: Commercial real estate: Nonfarm, nonresidential $ 2,501 $ 914 $ — Residential real estate: Other 709 709 — Commercial and industrial 22 22 — Consumer and other 25 25 — Subtotal 3,257 1,670 — With an allowance recorded: Commercial and industrial 80 80 80 Subtotal 80 80 80 Total $ 3,337 $ 1,750 $ 80 December 31, 2014 With no allowance recorded: Commercial real estate: Nonfarm, nonresidential $ 2,422 $ 835 $ — Residential real estate: Closed-end 1-4 family 93 93 — Subtotal 2,515 928 — With an allowance recorded: Commercial and industrial 18 18 18 Subtotal 18 18 18 Total $ 2,533 $ 946 $ 18 The following table presents the average recorded investment of impaired loans by class of loans for the three and nine months ended September 30, 2015 and 2014: Three Months Ended Nine Months Ended Average Recorded Investment 2015 2014 2015 2014 With no allowance recorded: Construction and land development $ — $ — $ — $ — Commercial real estate: Nonfarm, nonresidential 918 211 873 71 Residential real estate: Closed-end 1-4 family 33 — 188 — Other 712 — 317 — Commercial and industrial 23 — 77 — Consumer and other 25 — 8 — Subtotal 1,711 211 1,463 71 With an allowance recorded: Construction and land development $ — $ — $ — $ — Commercial real estate: Nonfarm, nonresidential — 1,194 — 837 Residential real estate: 1-4 family — — — 476 Commercial and industrial 90 64 50 65 Consumer and other 16 — 10 — Subtotal 106 1,258 60 1,378 Total $ 1,817 $ 1,469 $ 1,523 $ 1,449 The impact on net interest income for these loans was not material to the Company’s results of operations for the three and nine months ended September 30, 2015 and 2014. The following table presents the recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans as of September 30, 2015 and December 31, 2014: Nonaccrual Loans Past Due September 30, 2015 Commercial real estate: Nonfarm, nonresidential $ 835 $ — Total $ 835 $ — December 31, 2014 Commercial real estate: Nonfarm, nonresidential $ 835 $ — Residential real estate: Closed-end 1-4 family — 316 Total $ 835 $ 316 Nonaccrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. The following table presents the aging of the recorded investment in past due loans as of September 30, 2015 and December 31, 2014 by class of loans: 30-59 60-89 Greater Total Loans PCI Total September 30, 2015 Construction and land development $ 1,358 $ — $ — $ 1,358 $ 332,850 $ 77 $ 334,285 Commercial real estate: Nonfarm, nonresidential — — 835 835 302,822 1,452 305,109 Other — — — — 9,478 — 9,478 Residential real estate: Closed-end 1-4 family 839 — — 839 143,241 707 144,787 Other — — — — 104,371 2 104,373 Commercial and industrial 123 — — 123 219,218 1,675 221,016 Consumer and other 1 — — 1 6,892 — 6,893 $ 2,321 $ — $ 835 $ 3,156 $ 1,118,872 $ 3,913 $ 1,125,941 December 31, 2014 Construction and land development $ 354 $ — $ — $ 354 $ 238,871 $ 77 $ 239,302 Commercial real estate: Nonfarm, nonresidential — — 835 835 240,140 1,798 242,773 Other — — — — 5,377 — 5,377 Residential real estate: Closed-end 1-4 family 299 165 316 780 129,851 706 131,337 Other 52 — — 52 83,077 108 83,237 Commercial and industrial — 212 — 212 76,358 1,624 78,194 Consumer and other — — — — 8,025 2 8,027 $ 705 $ 377 $ 1,151 $ 2,233 $ 781,699 $ 4,315 $ 788,247 Credit Quality Indicators: Special Mention. Substandard. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass-rated loans. The following table includes PCI loans, which are included in the “Substandard” column. Based on the most recent analysis performed, the risk category of loans by class of loans is as follows as of September 30, 2015 and December 31, 2014: Pass Special Substandard Total September 30, 2015 Construction and land development $ 334,208 $ — $ 77 $ 334,285 Commercial real estate: Nonfarm, nonresidential 302,387 — 2,722 305,109 Other 9,478 — — 9,478 Residential real estate: Closed-end 1-4 family 143,564 — 1,223 144,787 Other 103,663 — 710 104,373 Commercial and industrial 219,522 — 1,494 221,016 Consumer and other 6,868 — 25 6,893 $ 1,119,690 $ — $ 6,251 $ 1,125,941 December 31, 2014 Construction and land development $ 239,225 $ — $ 77 $ 239,302 Commercial real estate: Nonfarm, nonresidential 239,584 — 3,189 242,773 Other 5,377 — — 5,377 Residential real estate: Closed-end 1-4 family 128,869 — 2,468 131,337 Other 83,129 — 108 83,237 Commercial and industrial 76,552 — 1,642 78,194 Consumer and other 8,025 — 2 8,027 $ 780,761 $ — $ 7,486 $ 788,247 Purchased Credit-Impaired (“PCI”) Loans Income is recognized on PCI loans pursuant to ASC Topic 310-30. A portion of the fair value discount has been recognized as an accretable yield that is accreted into interest income over the estimated remaining life of the loans. The remaining non-accretable difference represents cash flows not expected to be collected. The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans as of September 30, 2015 and December 31, 2014. Contractually required principal and interest payments have been adjusted for estimated prepayments. Sept 30, 2015 Dec 31, 2014 Contractually required principal and interest $ 5,872 $ 6,532 Non-accretable difference (307 ) (1,270 ) Cash flows expected to be collected 5,565 5,262 Accretable yield (1,652 ) (947 ) Carrying value of acquired loans 3,913 4,315 Allowance for loan losses (5 ) — Carrying value less allowance for loan losses $ 3,908 $ 4,315 Management adjusted estimates of future expected losses, cash flows and renewal assumptions during the nine months ended September 30, 2015. These adjustments resulted in a decrease in expected cash flows and accretable yield, and a decrease in the non-accretable difference. The table below summarizes the changes in total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans during the three- and nine-month periods ended September 30, 2015. Activity during the three-month period ended September 30, 2015 Jun 30, 2015 Effect of Income All other Sept 30, 2015 Contractually required principal and interest $ 6,000 $ — $ — $ (128 ) $ 5,872 Non-accretable difference (973 ) — 839 (173 ) (307 ) Cash flows expected to be collected 5,027 — 839 (301 ) 5,565 Accretable yield (749 ) — 447 (1,350 ) (1,652 ) Carrying value of acquired loans $ 4,278 $ — $ 1,286 $ (1,651 ) $ 3,913 Activity during the nine-month period ended September 30, 2015 Dec 31, 2014 Effect of Income All other Sept 30, 2015 Contractually required principal and interest $ 6,532 $ — $ — $ (660 ) $ 5,872 Non-accretable difference (1,270 ) — 839 124 (307 ) Cash flows expected to be collected 5,262 — 839 (536 ) 5,565 Accretable yield (947 ) — 637 (1,342 ) (1,652 ) Carrying value of acquired loans $ 4,315 $ — $ 1,476 $ (1,878 ) $ 3,913 Troubled Debt Restructurings The Company’s loan portfolio contains no loans that have been modified in a troubled debt restructuring.

Loan Servicing

Loan Servicing	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Loan Servicing	NOTE 5—LOAN SERVICING Loans serviced for others are not reported as assets. The principal balances of these loans at September 30, 2015 and December 31, 2014 are as follows: September 30, December 31, Loan portfolios serviced for: Federal Home Loan Mortgage Corporation $ 461,121 $ 414,222 Other 3,613 3,986 The components of net loan servicing fees for the three and nine months ended September 30, 2015 and 2014 were as follows: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Loan servicing fees, net: Loan servicing fees $ 287 $ 253 $ 831 $ 720 Amortization of loan servicing fees (203 ) (180 ) (644 ) (547 ) Change in impairment — — — — Total $ 84 $ 73 $ 187 $ 173 The fair value of servicing rights was estimated by management to be approximately $4,264 at September 30, 2015. Fair value for September 30, 2015 was determined using a weighted average discount rate of 10.5% and a weighted average prepayment speed of 11.5%. At December 31, 2014, the fair value of servicing rights was estimated by management to be approximately $4,180. Fair value for December 31, 2014 was determined using weighted average discount rate of 10.5% and a weighted average prepayment speed of 10.8%. The weighted average amortization period is 6.77 years. Estimated amortization expense for each of the next three years is: 2015 $ 782 2016 552 2017 552

Share-Based Payments

Share-Based Payments	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Payments	NOTE 6—SHARE-BASED PAYMENTS In connection with the Company’s 2010 private offering, 32,425 warrants were issued to shareholders, one warrant for every twenty shares of common stock purchased. Each warrant allows the shareholders to purchase an additional share of common stock at $12.00 per share. The warrants were issued with an effective date of March 30, 2010 and will be exercisable in whole or in part up to seven years following the date of issuance. The warrants are detachable from the common stock. There were 4,970 warrants exercised during the nine months ended September 30, 2015, for which the Company received cash proceeds of $60. The exercised warrants had an aggregate intrinsic value of $46 at the date of exercise. No warrants were exercised during the nine months ended September 30, 2014. At September 30, 2015, there were 26,907 outstanding warrants associated with the 2010 offering. Since the common stock of the Company has been registered under the Securities Act and has been traded on a national securities exchange at $15.00 or more for forty-five (45) consecutive days, the Company may redeem the 2010 warrants at any time with not less than thirty (30) days’ written notice to the holder of such 2010 warrant, in whole or in part, at a redemption price of $1.00 per warrant; provided, however, that the holder of the 2010 warrant may exercise the 2010 warrant, in whole or in part, during such thirty (30) day period. Stock Option Plan Employee, organizer and director awards are granted with an exercise price equal to the market price of the Company’s common stock at the date of grant; those option awards have a vesting period of 3 to 5 years and have a 10-year contractual term. The Company assigns discretion to its Board of Directors to make grants either as qualified incentive stock options or as non-qualified stock options. All employee grants are intended to be treated as qualified incentive stock options, if allowable. All other grants are expected to be treated as non-qualified. On July 1, 2014, 322,300 MidSouth common stock options were converted into 137,280 options to purchase shares of FFN common stock with an exercise price of $8.57 per option pursuant to the terms of the merger agreement (see Note 2). Using the Black-Scholes option valuation model, the grant date fair value was estimated to be $6.31 per converted option based on the $14.50 fair value per share of FFN common stock at July 1, 2014. No compensation expense was required related to the converted options. The fair value of each option award is estimated on the date of grant using a closed form option valuation (Black-Scholes) model that uses the assumptions noted in the table below. Expected stock price volatility is based on historical volatilities of a peer group. The Company uses historical data to estimate option exercise and post-vesting termination behavior. The expected term of options granted represents the period of time that options granted are expected to be outstanding, which takes into account that the options are not transferable. The risk-free interest rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The fair value of options granted was determined using the following weighted-average assumptions as of grant date. September 30, September 30, Risk-free interest rate 1.84 % 1.81 % Expected term 7.5 years 5.9 years Expected stock price volatility 25.00 % 10.85 % Dividend yield 0.22 % 0.23 % The weighted average fair value of options granted for the nine months ended September 30, 2015 and 2014 were $6.41 and $4.12, respectively. A summary of the activity in the stock option plans for the nine months ended September 30, 2015 follows: Shares Weighted Weighted Aggregate Outstanding at beginning of year 1,210,660 $ 11.32 6.53 $ 7,244 Granted 226,782 20.78 Exercised (93,754 ) 11.53 Forfeited, expired, or cancelled (4,417 ) 19.02 Outstanding at period end 1,339,271 $ 12.88 6.39 $ 12,685 Vested or expected to vest 1,272,307 $ 12.88 6.39 $ 12,051 Exercisable at period end 829,072 $ 10.76 5.06 $ 9,606 The Company received cash proceeds of $780 for the options exercised during the nine months ended September 30, 2015. The exercised options had an aggregate intrinsic value of $839 at the date of exercise. As of September 30, 2015, there was $1,733 of total unrecognized compensation cost related to non-vested stock options granted under the Plan. The cost is expected to be recognized over a weighted-average period of 1.7 years. Restricted Share Award Plan A summary of activity for non-vested restricted share awards for the nine months ended September 30, 2015 is as follows: Non-vested Shares Shares Weighted- Grant-Date Non-vested at beginning of year 102,710 $ 13.93 Granted 31,938 20.69 Vested (25,075 ) 14.08 Forfeited (3,709 ) 15.99 Non-vested at period end 105,864 $ 15.89 Compensation expense associated with the restricted share awards is recognized on a straight-line basis over the time period that the restrictions associated with the awards lapse based on the total cost of the award at the grant date. As of September 30, 2015, there was $1,524 of total unrecognized compensation cost related to non-vested shares granted under the Plan. The cost is expected to be recognized over a weighted-average period of 3.5 years.

Regulatory Capital Matters

Regulatory Capital Matters	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Regulatory Capital Matters	NOTE 7—REGULATORY CAPITAL MATTERS In July 2013, the Federal Reserve Board and the FDIC approved final rules that substantially amended the regulatory risk-based capital rules applicable to the Company and Bank. The final rules implement the regulatory capital reforms of the Basel Committee on Banking Supervision reflected in “Basel III: A Global Framework for More Resilient Banks and Banking Systems” (“Basel III”) and changes required by the Dodd-Frank Wall Street Reform and Consumer Protection Act. Under these rules, the leverage and risk-based capital ratios of financial holding companies may not be lower than the leverage and risk-based capital ratios for insured depository institutions. The final rules implementing the Basel III regulatory capital reforms became effective to the Company and Bank on January 1, 2015, and include new minimum risk-based capital and leverage ratios. Moreover, these rules refine the definition of what constitutes capital for purposes of calculating those ratios, including the definitions of Tier 1 capital and Tier 2 capital. In addition to the new minimum capital level requirements, the rules also establish a “capital conservation buffer” of 2.5% (to be phased in over three years) above the new regulatory minimum risk-based capital ratios, and result in the following minimum ratios once the capital conservation buffer is fully phased in: (i) a common Tier 1 risk-based capital ratio of 7.0%, (ii) a Tier 1 risk-based capital ratio of 8.5%, and (iii) a total risk-based capital ratio of 10.5%. The capital conservation buffer is to be phased in beginning in January 2016 at 0.625% of risk-weighted assets and will increase each year until fully implemented in January 2019. An institution will be subject to limitations on paying dividends, engaging in share repurchases, and paying discretionary bonuses if capital levels fall below minimum levels plus the buffer amounts. These limitations establish a maximum percentage of eligible retained income that could be utilized for such actions. The final rules allow banks and their holding companies with less than $250 billion in assets a one-time opportunity to opt-out of a requirement to include unrealized gains and losses in accumulated other comprehensive income in their capital calculation. The Company has opted out of this requirement. Management believes, as of September 30, 2015, that the Company and Bank met all capital adequacy requirements to which they are subject and met the requirements to be considered well-capitalized. The Company’s and Bank’s actual capital amounts and ratios are presented in the following table (in thousands): Actual Required To Be Well Amount Ratio Amount Ratio Amount Ratio September 30, 2015 Company common equity Tier 1 capital to risk-weighted assets $ 161,721 11.03 % $ 65,479 4.50 % $ 87,937 6.00 % Company Total Capital to risk weighted assets $ 178,516 12.18 % $ 116,407 8.00 % $ 146,562 10.00 % Company Tier 1 (Core) Capital to risk weighted assets $ 168,771 11.52 % $ 58,204 6.00 % $ 117,249 8.00 % Company Tier 1 (Core) Capital to average assets $ 168,771 8.90 % $ 75,824 4.00 % $ 94,781 5.00 % Bank common equity Tier 1 capital to risk-weighted assets $ 166,116 11.34 % $ 65,947 4.50 % $ 87,930 6.00 % Bank Total Capital to risk weighted assets $ 175,860 12.00 % $ 117,239 8.00 % $ 146,549 10.00 % Bank Tier 1 (Core) Capital to risk weighted assets $ 166,116 11.34 % $ 87,930 6.00 % $ 117,239 8.00 % Bank Tier 1 (Core) Capital to average assets $ 166,116 8.76 % $ 75,824 4.00 % $ 94,781 5.00 % December 31, 2014 Company Total Capital to risk weighted assets $ 114,475 12.30 % $ 74,464 8.00 % N/A N/A Company Tier 1 (Core) Capital to risk weighted assets $ 107,795 11.58 % $ 37,232 4.00 % N/A N/A Company Tier 1 (Core) Capital to average assets $ 107,795 8.57 % $ 50,291 4.00 % N/A N/A Bank Total Capital to risk weighted assets $ 113,830 12.23 % $ 74,447 8.00 % $ 93,059 10.00 % Bank Tier 1 (Core) Capital to risk weighted assets $ 107,150 11.51 % $ 37,223 4.00 % $ 55,835 6.00 % Bank Tier 1 (Core) Capital to average assets $ 107,150 8.52 % $ 50,279 4.00 % $ 62,849 5.00 % Dividend Restrictions

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value	NOTE 8—FAIR VALUE Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. The Company used the following methods and significant assumptions to estimate the fair value of each type of asset and liability: Securities Derivatives Impaired Loans Foreclosed Assets Loans Held For Sale: Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which the Company has elected the fair value option, are summarized below: Fair Value Measurements at Quoted Prices Significant Significant Financial Assets Securities available for sale U.S. government sponsored entities and agencies $ — $ 14,418 $ — Mortgage-backed securities-residential — 514,599 — Mortgage-backed securities-commercial — 20,330 — State and political subdivisions — 75,073 — Total securities available for sale $ — $ 624,420 $ — Loans held for sale $ — $ 14,666 $ — Mortgage banking derivatives $ — $ 559 $ — Financial Liabilities Mortgage banking derivatives $ — $ 131 $ — Fair Value Measurements at Quoted Prices Significant Significant Financial Assets Securities available for sale U.S. government sponsored entities and agencies $ — $ 30,173 $ — U.S. Treasury Bills 20,000 — — Mortgage-backed securities-residential — 339,067 — Mortgage-backed securities-commercial — 6,465 — State and political subdivisions — — — Total securities available for sale $ 20,000 $ 375,705 $ — Loans held for sale $ — $ 18,462 $ — Mortgage banking derivatives $ — $ 285 $ — Financial Liabilities Mortgage banking derivatives $ — $ 132 $ — As of September 30, 2015, the unpaid principal balance of loans held for sale was $14,124 resulting in an unrealized gain of $542 included in gains on sale of loans. For the three months ended September 30, 2015 and 2014, the change in fair value related to loans held for sale, which is included in gain on sale of loans, was $248 and $217, respectively. For the nine months ended September 30, 2015 and 2014, the change in fair value related to loans held for sale, which is included in gain on sale of loans, was ($22) and $755, respectively. None of these loans are 90 days or more past due or on nonaccrual as of September 30, 2015. There were no transfers between level 1 and 2 during 2015 and 2014. Assets measured at fair value on a non-recurring basis are summarized below: There were no collateral dependent impaired loans carried at fair value as of September 30, 2015 or December 31, 2014. For the three months ended September 30, 2015 and 2014, $0 and ($7), respectively, in additional provision for loan losses was recorded related to impaired loans recorded at fair value of collateral. For the nine months ended September 30, 2015 and 2014, $0 and $39, respectively, in additional provision for loan losses was recorded related to impaired loans recorded at fair value of collateral. Foreclosed assets measured at fair value less costs to sell, had a net carrying amount of $206 and $715 as of September 30, 2015 and December 31, 2014, respectively. There were no properties at September 30, 2015 or 2014 that had required write-downs to fair value resulting in no write downs for the three or nine months ended September 30, 2015 and 2014. The carrying amounts and estimated fair values of financial instruments, at September 30, 2015 and December 31, 2014 are as follows: Carrying Fair Value Measurements at Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 47,658 $ 47,658 $ — $ — $ 47,658 Securities available for sale 624,420 — 624,420 — 624,420 Certificates of deposit held at other financial institutions 250 — 250 — 250 Securities held to maturity 132,134 — 134,028 — 134,028 Loans held for sale 14,666 — 14,666 — 14,666 Net loans 1,114,082 — — 1,112,007 1,112,007 Restricted equity securities 7,691 n/a n/a n/a n/a Servicing rights, net 3,415 — 4,264 — 4,264 Accrued interest receivable 6,108 7 3,032 3,069 6,108 Financial liabilities Deposits $ 1,714,594 $ 956,892 $ 764,467 $ — $ 1,721,359 Federal funds purchased and repurchase agreements 37,618 — 37,618 — 37,618 Federal Home Loan Bank advances 57,000 — 57,123 — 57,123 Accrued interest payable 587 79 508 — 587 Carrying Fair Value Measurements at Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 49,347 $ 49,347 $ — $ — $ 49,347 Securities available for sale 395,705 20,000 375,705 — 395,705 Certificates of deposit held at other financial institutions 250 — 250 — 250 Securities held to maturity 53,332 — 53,741 — 53,741 Loans held for sale 18,462 — 18,462 — 18,462 Net loans 780,508 — — 782,745 782,745 Restricted equity securities 5,349 n/a n/a n/a n/a Servicing rights, net 3,053 — 4,180 — 4,180 Accrued interest receivable 3,545 — 1,368 2,177 3,545 Financial liabilities Deposits $ 1,172,233 $ 848,158 $ 326,644 $ — $ 1,174,802 Federal funds purchased and repurchase agreements 39,078 — 39,078 — 39,078 Federal Home Loan Bank advances 19,000 — 19,146 — 19,146 Accrued interest payable 421 33 388 — 421 The methods and assumptions not previously described used to estimate fair value are described as follows: (a) Cash and Cash Equivalents: (b) Loans: The fair value of loans held for sale is estimated based upon binding contracts and quotes from third party investors resulting in a Level 2 classification. (c) Restricted Equity Securities: (d) Mortgage Servicing Rights: (e) Deposits: (f) Federal Funds Purchased and Repurchase Agreements: (g) Federal Home Loan Bank Advances: (h) Accrued Interest Receivable/Payable: (i) Off-balance Sheet Instruments:

Securities Sold under Agreement

Securities Sold under Agreement to Repurchase	9 Months Ended
	Sep. 30, 2015
Brokers and Dealers [Abstract]
Securities Sold under Agreement to Repurchase	NOTE 9—SECURITIES SOLD UNDER AGREEMENT TO REPURCHASE Our subsidiary bank enters into borrowing arrangements with our retail business customers through agreements to repurchase (“securities sold under agreements to repurchase”) under which the bank pledges investment securities owned and under its control as collateral against these one-day borrowing arrangements. At September 30, 2015 and December 31, 2014, these short-term borrowings totaled $37,618 and $22,253, respectively. The following table provides additional details as of September 30, 2015: As of September 30, 2015 U.S. Mortgage- Mortgage- Total Market value of securities pledged $ 6,039 $ 33,542 $ 3,471 $ 43,052 Borrowings related to pledged amounts $ 4,734 $ 29,623 $ 3,261 $ 37,618 Market value pledged as a % of borrowings 128 % 113 % 106 % 114 % Any risks related to these arrangements, primarily from market value changes, are minimized due to the overnight (one day) maturity and the additional collateral pledged over the borrowed amounts.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 10—EARNINGS PER SHARE The two-class method is used in the calculation of basic and diluted earnings per share. Under the two-class method, earnings available to common shareholders for the period are allocated between common shareholders and participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings. The factors used in the earnings per share computation follow: Three Months Ended 2015 2014 Basic Net income available to common shareholders $ 5,125 $ 1,990 Less: earnings allocated to participating securities (52 ) (27 ) Net income allocated to common shareholders $ 5,073 $ 1,963 Weighted average common shares outstanding including participating securities 10,516,290 7,737,710 Less: Participating securities (107,502 ) (105,129 ) Average shares 10,408,788 7,632,581 Basic earnings per common share $ 0.49 $ 0.26 Diluted Net income allocated to common shareholders $ 5,073 $ 1,963 Weighted average common shares outstanding for basic earnings per common share 10,408,788 7,632,581 Add: Dilutive effects of assumed exercises of stock options 534,148 272,634 Add: Dilutive effects of assumed exercises of stock warrants 13,265 7,559 Average shares and dilutive potential common shares 10,956,201 7,912,774 Dilutive earnings per common share $ 0.46 $ 0.25 Nine Months Ended 2015 2014 Basic Net income available to common shareholders $ 11,341 $ 5,504 Less: earnings allocated to participating securities (127 ) (57 ) Net income allocated to common shareholders $ 11,214 $ 5,447 Weighted average common shares outstanding including participating securities 9,668,497 5,840,620 Less: Participating securities (108,617 ) (60,840 ) Average shares 9,559,880 5,779,780 Basic earnings per common share $ 1.17 $ 0.94 Diluted Net income allocated to common shareholders $ 11,214 $ 5,447 Weighted average common shares outstanding for basic earnings per common share 9,559,880 5,779,780 Add: Dilutive effects of assumed exercises of stock options 466,955 170,470 Add: Dilutive effects of assumed exercises of stock warrants 13,257 5,033 Average shares and dilutive potential common shares 10,040,092 5,955,283 Dilutive earnings per common share $ 1.12 $ 0.91 For the three months ended September 30, 2015, stock options for 226,040 shares of common stock were not considered in computing diluted earnings per common share because they were antidilutive. Stock options for 228,691 and 274,132 shares of common stock were not considered in computing diluted earnings per common share for the nine months ended September 30, 2015 and 2014 because they were antidilutive.

Capital Offering

Capital Offering	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Capital Offering	NOTE 11—CAPITAL OFFERING The Company commenced its initial public offering on March 26, 2015. The Company issued 2,640,000 shares of common stock at a price of $21.00 per share and began trading on the New York Stock Exchange on March 26, 2015, under the ticker symbol “FSB”. Net proceeds were as follows: Gross proceeds $ 55,440 Less: Stock offering costs (5,017 ) Net proceeds from issuance of common stock $ 50,423

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Contractually Required Principal and Interest Cash Payments, Management's Estimates of Expected Total Cash Payments	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and fair value of the loans as of July 1, 2014 for purchased credit-impaired (“PCI”) loans. Contractually required principal and interest payments have been adjusted for estimated prepayments. Contractually required principal and interest $ 8,510 Non-accretable difference (1,745 ) Cash flows expected to be collected 6,765 Accretable yield (1,238 ) Total purchased credit-impaired loans acquired $ 5,527
Pro-Forma Financial Information and Actual Results of Acquisition	Pro forma data for the nine-month period ended September 30, 2014 listed in the table below presents pro forma information as if the MidSouth acquisition occurred at the beginning of 2014. Because the MidSouth transaction closed on July 1, 2014, and its actual results are included in the Company’s actual operating results for the three-month periods ended September 30, 2014 and 2015 and for the nine-month period ended September 30, 2015, there is no pro forma information for those periods. Nine Months Ended Net interest income $ 31,619 Net income available to common shareholders 6,353 Earnings per share—basic $ 0.82 Earnings per share—diluted $ 0.80

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2015
Summary of Amortized Cost and Fair Value of Available for Sale Securities	The following table summarizes the amortized cost and fair value of the available for sale securities portfolio at September 30, 2015 and December 31, 2014 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income. Amortized Gross Gross Fair September 30, 2015 U.S. government sponsored entities and agencies $ 14,211 $ 253 $ (46 ) $ 14,418 Mortgage-backed securities: residential 508,817 6,868 (1,086 ) 514,599 Mortgage-backed securities: commercial 20,169 161 — 20,330 State and political subdivisions 74,220 896 (43 ) 75,073 Total $ 617,417 $ 8,178 $ (1,175 ) $ 624,420 Amortized Gross Gross Fair December 31, 2014 U.S. government sponsored entities and agencies $ 30,070 $ 417 $ (314 ) $ 30,173 U.S. Treasury securities 20,000 — — 20,000 Mortgage-backed securities: residential 335,677 4,593 (1,203 ) 339,067 Mortgage-backed securities: commercial 6,432 33 — 6,465 Total $ 392,179 $ 5,043 $ (1,517 ) $ 395,705
Schedule of Amortized Cost and Fair Value of Held to Maturity Securities Portfolio	The amortized cost and fair value of the held to maturity securities portfolio at September 30, 2015 and December 31, 2014 and the corresponding amounts of gross unrecognized gains and losses were as follows: Amortized Gross Gross Fair September 30, 2015 U.S. government sponsored entities and agencies $ 3,301 $ 13 $ (42 ) $ 3,272 Mortgage backed securities: residential 31,691 658 (318 ) 32,031 State and political subdivisions 97,142 1,605 (22 ) 98,725 Total $ 132,134 $ 2,276 $ (382 ) $ 134,028 Gross Gross Gross Fair December 31, 2014 U.S. government sponsored entities and agencies $ 5,550 $ 162 $ (87 ) $ 5,625 Mortgage backed securities: residential 38,587 555 (562 ) 38,580 State and political subdivisions 9,195 351 (10 ) 9,536 Total $ 53,332 $ 1,068 $ (659 ) $ 53,741
Schedule of Amortized Cost and Fair Value of Investment Securities Portfolio by Contractual Maturity	The amortized cost and fair value of the investment securities portfolio are shown by contractual maturity. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately. September 30, 2015 Amortized Fair Available for sale Three months or less $ — $ — Over three months through one year — — Over one year through five years — — Over five years through ten years 7,761 8,009 Over ten years 80,670 81,482 Mortgage-backed securities: residential 508,817 514,599 Mortgage-backed securities: commercial 20,169 20,330 Total $ 617,417 $ 624,420 Held to maturity Three months or less $ — $ — Over three months through one year — — Over one year through five years 1,307 1,366 Over five years through ten years 3,024 3,091 Over ten years 96,112 97,540 Mortgage-backed securities: residential 31,691 32,031 Total $ 132,134 $ 134,028
Schedule of Unrealized Losses and Fair Value by Major Security Type	The following table summarizes the securities with unrealized and unrecognized losses at September 30, 2015 and December 31, 2014, aggregated by major security type and length of time in a continuous unrealized loss position: Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized September 30, 2015 Available for sale U.S. government sponsored entities and agencies $ — $ — $ 1,654 $ (46 ) $ 1,654 $ (46 ) Mortgage-backed securities: residential 77,224 (620 ) 26,253 (466 ) 103,477 (1,086 ) State and political subdivisions 2,981 (43 ) — — 2,981 (43 ) Total available for sale $ 80,205 $ (663 ) $ 27,907 $ (512 ) $ 108,112 $ (1,175 ) Less Than 12 Months 12 Months or Longer Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Held to maturity U.S. government sponsored entities and agencies $ 1,979 $ (21 ) $ 979 $ (21 ) $ 2,958 $ (42 ) Mortgage-backed securities: residential 1,800 (6 ) 5,690 (312 ) 7,490 (318 ) State and political subdivisions 4,671 (22 ) — — 4,671 (22 ) Total held to maturity $ 8,450 $ (49 ) $ 6,669 $ (333 ) $ 15,119 $ (382 ) Less Than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized December 31, 2014 Available for sale U.S. government sponsored entities and agencies $ 9,999 $ (1 ) $ 8,232 $ (313 ) $ 18,231 $ (314 ) Mortgage-backed securities: residential 59,078 (323 ) 41,939 (880 ) 101,017 (1,203 ) Total available for sale $ 69,077 $ (324 ) $ 50,171 $ (1,193 ) $ 119,248 $ (1,517 ) Less Than 12 Months 12 Months or Longer Total Fair Unrecognized Fair Unrecognized Fair Unrecognized Held to maturity U.S. government sponsored entities and agencies $ — $ — $ 2,913 $ (87 ) $ 2,913 $ (87 ) Mortgage-backed securities: residential 5,246 (25 ) 13,001 (537 ) 18,247 (562 ) State and political subdivisions 507 (1 ) 592 (9 ) 1,099 (10 ) Total held to maturity $ 5,753 $ (26 ) $ 16,506 $ (633 ) $ 22,259 $ (659 )
Available-for-sale Securities [Member]
Summary of Sales and Calls of Securities	Sales and calls of available for sale securities were as follows: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Proceeds $ 19,776 $ 9,767 $ 54,064 $ 34,087 Gross gains 95 31 485 256 Gross losses (90 ) (9 ) (105 ) (163 )
Held-to-maturity Securities [Member]
Summary of Sales and Calls of Securities	Calls of held to maturity securities were as follows: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Proceeds $ — $ — $ 2,300 $ — Gross gains — — 149 — Gross losses — — — —

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Summary of Loans	Loans at September 30, 2015 and December 31, 2014 were as follows: September 30, December 31, Loans that are not PCI loans Construction and land development $ 334,208 $ 239,225 Commercial real estate: Nonfarm, nonresidential 303,657 240,975 Other 9,478 5,377 Residential real estate: Closed-end 1-4 family 144,080 130,631 Other 104,371 83,129 Commercial and industrial 219,341 76,570 Consumer and other 6,893 8,025 Loans before net deferred loan fees 1,122,028 783,932 Deferred loan fees, net (2,115 ) (1,059 ) Total loans that are not PCI loans 1,119,913 782,873 PCI loans Construction and land development $ 77 $ 77 Commercial real estate: Nonfarm, nonresidential 1,452 1,798 Other — — Residential real estate: Closed-end 1-4 family 707 706 Other 2 108 Commercial and industrial 1,675 1,624 Consumer and other — 2 Total PCI loans 3,913 4,315 Allowance for loan losses (9,744 ) (6,680 ) Total loans, net of allowance for loan losses $ 1,114,082 $ 780,508
Activity in Allowance for Loan Losses by Portfolio Segment	The following table presents the activity in the allowance for loan losses by portfolio segment for the three month periods ended September 30, 2015 and 2014: Construction Commercial Residential Commercial Consumer Total Three Months Ended September 30, 2015 Allowance for loan losses: Beginning balance $ 2,567 $ 2,321 $ 1,739 $ 1,324 $ 65 $ 8,016 Provision (credit) for loan losses 461 135 (71 ) 1,253 (54 ) 1,724 Loans charged-off — — (15 ) (15 ) (33 ) (63 ) Recoveries — — 6 — 61 67 Total ending allowance balance $ 3,028 $ 2,456 $ 1,659 $ 2,562 $ 39 $ 9,744 Three Months Ended September 30, 2014 Allowance for loan losses: Beginning balance $ 1,910 $ 1,740 $ 1,560 $ 508 $ 53 $ 5,771 Provision (credit) for loan losses 231 173 192 72 (4 ) 664 Loans charged-off — (540 ) (11 ) (4 ) — (555 ) Recoveries — — 3 — — 3 Total ending allowance balance $ 2,141 $ 1,373 $ 1,744 $ 576 $ 49 $ 5,883 There was $5 in allowance for loan losses for PCI loans for the three months ended September 30, 2015. There was no allowance for loan losses for the three months ended September 30, 2014. The following table presents the activity in the allowance for loan losses by portfolio segment for the nine-month periods ended September 30, 2015 and 2014: Construction Commercial Residential Commercial Consumer Total Nine Months Ended September 30, 2015 Allowance for loan losses: Beginning balance $ 2,690 $ 1,494 $ 1,791 $ 650 $ 55 $ 6,680 Provision (credit) for loan losses 338 962 (114 ) 1,927 41 3,154 Loans charged-off — — (32 ) (15 ) (121 ) (168 ) Recoveries — — 14 — 64 78 Total ending allowance balance $ 3,028 $ 2,456 $ 1,659 $ 2,562 $ 39 $ 9,744 Nine Months Ended September 30, 2014 Allowance for loan losses: Beginning balance $ 1,552 $ 1,511 $ 1,402 $ 337 $ 98 $ 4,900 Provision (credit) for loan losses 589 402 304 243 (49 ) 1,489 Loans charged-off — (540 ) (11 ) (4 ) — (555 ) Recoveries — — 49 — — 49 Total ending allowance balance $ 2,141 $ 1,373 $ 1,744 $ 576 $ 49 $ 5,883
Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method	The following table presents the balance in the allowance for loan losses and the recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2015 and December 31, 2014. For purposes of this table, recorded investment in loans excludes accrued interest receivable and loan fees, net due to immateriality. Construction Commercial Residential Commercial Consumer Total September 30, 2015 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 80 $ — $ 80 Collectively evaluated for impairment 3,028 2,451 1,659 2,482 39 9,659 Purchased credit-impaired loans — 5 — — — 5 Total ending allowance balance $ 3,028 $ 2,456 $ 1,659 $ 2,562 $ 39 $ 9,744 Loans: Individually evaluated for impairment $ — $ 914 $ 709 $ 102 $ 25 $ 1,750 Collectively evaluated for impairment 334,208 312,221 247,742 219,239 6,868 1,120,278 Purchased credit-impaired loans 77 1,452 709 1,675 — 3,913 Total ending loans balance $ 334,285 $ 314,587 $ 249,160 $ 221,016 $ 6,893 $ 1,125,941 Construction Commercial Residential Commercial Consumer Total December 31, 2014 Allowance for loan losses: Ending allowance balance attributable to loans: Individually evaluated for impairment $ — $ — $ — $ 18 $ — $ 18 Collectively evaluated for impairment 2,690 1,494 1,791 632 55 6,662 Purchased credit-impaired loans — — — — — — Total ending allowance balance $ 2,690 $ 1,494 $ 1,791 $ 650 $ 55 $ 6,680 Loans: Individually evaluated for impairment $ — $ 835 $ 93 $ 18 $ — $ 946 Collectively evaluated for impairment 239,225 245,517 213,667 76,552 8,025 782,986 Purchased credit-impaired loans 77 1,798 814 1,624 2 4,315 Total ending loans balance $ 239,302 $ 248,150 $ 214,574 $ 78,194 $ 8,027 $ 788,247
Summary of Impaired Loans by Class of Loans	The following table presents information related to impaired loans by class of loans as of September 30, 2015 and December 31, 2014: Unpaid Recorded Allowance for September 30, 2015 With no allowance recorded: Commercial real estate: Nonfarm, nonresidential $ 2,501 $ 914 $ — Residential real estate: Other 709 709 — Commercial and industrial 22 22 — Consumer and other 25 25 — Subtotal 3,257 1,670 — With an allowance recorded: Commercial and industrial 80 80 80 Subtotal 80 80 80 Total $ 3,337 $ 1,750 $ 80 December 31, 2014 With no allowance recorded: Commercial real estate: Nonfarm, nonresidential $ 2,422 $ 835 $ — Residential real estate: Closed-end 1-4 family 93 93 — Subtotal 2,515 928 — With an allowance recorded: Commercial and industrial 18 18 18 Subtotal 18 18 18 Total $ 2,533 $ 946 $ 18 The following table presents the average recorded investment of impaired loans by class of loans for the three and nine months ended September 30, 2015 and 2014: Three Months Ended Nine Months Ended Average Recorded Investment 2015 2014 2015 2014 With no allowance recorded: Construction and land development $ — $ — $ — $ — Commercial real estate: Nonfarm, nonresidential 918 211 873 71 Residential real estate: Closed-end 1-4 family 33 — 188 — Other 712 — 317 — Commercial and industrial 23 — 77 — Consumer and other 25 — 8 — Subtotal 1,711 211 1,463 71 With an allowance recorded: Construction and land development $ — $ — $ — $ — Commercial real estate: Nonfarm, nonresidential — 1,194 — 837 Residential real estate: 1-4 family — — — 476 Commercial and industrial 90 64 50 65 Consumer and other 16 — 10 — Subtotal 106 1,258 60 1,378 Total $ 1,817 $ 1,469 $ 1,523 $ 1,449
Schedule of Recorded Investment in Nonaccrual and Loans Past Due Over 90 Days on Accrual by Class of Loans	The following table presents the recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans as of September 30, 2015 and December 31, 2014: Nonaccrual Loans Past Due September 30, 2015 Commercial real estate: Nonfarm, nonresidential $ 835 $ — Total $ 835 $ — December 31, 2014 Commercial real estate: Nonfarm, nonresidential $ 835 $ — Residential real estate: Closed-end 1-4 family — 316 Total $ 835 $ 316
Schedule of Aging of Recorded Investment in Past Due Loans by Class of Loans	The following table presents the aging of the recorded investment in past due loans as of September 30, 2015 and December 31, 2014 by class of loans: 30-59 60-89 Greater Total Loans PCI Total September 30, 2015 Construction and land development $ 1,358 $ — $ — $ 1,358 $ 332,850 $ 77 $ 334,285 Commercial real estate: Nonfarm, nonresidential — — 835 835 302,822 1,452 305,109 Other — — — — 9,478 — 9,478 Residential real estate: Closed-end 1-4 family 839 — — 839 143,241 707 144,787 Other — — — — 104,371 2 104,373 Commercial and industrial 123 — — 123 219,218 1,675 221,016 Consumer and other 1 — — 1 6,892 — 6,893 $ 2,321 $ — $ 835 $ 3,156 $ 1,118,872 $ 3,913 $ 1,125,941 December 31, 2014 Construction and land development $ 354 $ — $ — $ 354 $ 238,871 $ 77 $ 239,302 Commercial real estate: Nonfarm, nonresidential — — 835 835 240,140 1,798 242,773 Other — — — — 5,377 — 5,377 Residential real estate: Closed-end 1-4 family 299 165 316 780 129,851 706 131,337 Other 52 — — 52 83,077 108 83,237 Commercial and industrial — 212 — 212 76,358 1,624 78,194 Consumer and other — — — — 8,025 2 8,027 $ 705 $ 377 $ 1,151 $ 2,233 $ 781,699 $ 4,315 $ 788,247
Summary of Risk Category of Loans by Class of Loans	Based on the most recent analysis performed, the risk category of loans by class of loans is as follows as of September 30, 2015 and December 31, 2014: Pass Special Substandard Total September 30, 2015 Construction and land development $ 334,208 $ — $ 77 $ 334,285 Commercial real estate: Nonfarm, nonresidential 302,387 — 2,722 305,109 Other 9,478 — — 9,478 Residential real estate: Closed-end 1-4 family 143,564 — 1,223 144,787 Other 103,663 — 710 104,373 Commercial and industrial 219,522 — 1,494 221,016 Consumer and other 6,868 — 25 6,893 $ 1,119,690 $ — $ 6,251 $ 1,125,941 December 31, 2014 Construction and land development $ 239,225 $ — $ 77 $ 239,302 Commercial real estate: Nonfarm, nonresidential 239,584 — 3,189 242,773 Other 5,377 — — 5,377 Residential real estate: Closed-end 1-4 family 128,869 — 2,468 131,337 Other 83,129 — 108 83,237 Commercial and industrial 76,552 — 1,642 78,194 Consumer and other 8,025 — 2 8,027 $ 780,761 $ — $ 7,486 $ 788,247
Summary of Total Contractually Required Principal and Interest Cash Payments, Management's Estimate of Expected Total Cash Payments and Carrying Value of Purchased Credit-Impaired ("PCI") Loans	The table below summarizes the total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans as of September 30, 2015 and December 31, 2014. Contractually required principal and interest payments have been adjusted for estimated prepayments. Sept 30, 2015 Dec 31, 2014 Contractually required principal and interest $ 5,872 $ 6,532 Non-accretable difference (307 ) (1,270 ) Cash flows expected to be collected 5,565 5,262 Accretable yield (1,652 ) (947 ) Carrying value of acquired loans 3,913 4,315 Allowance for loan losses (5 ) — Carrying value less allowance for loan losses $ 3,908 $ 4,315
Summary of Changes in Total Contractually Required Principal and Interest Cash Payments, Managements Estimate of Expected Total Cash Payments and Carrying Value of Loans	The table below summarizes the changes in total contractually required principal and interest cash payments, management’s estimate of expected total cash payments and carrying value of the loans during the three- and nine-month periods ended September 30, 2015. Activity during the three-month period ended September 30, 2015 Jun 30, 2015 Effect of Income All other Sept 30, 2015 Contractually required principal and interest $ 6,000 $ — $ — $ (128 ) $ 5,872 Non-accretable difference (973 ) — 839 (173 ) (307 ) Cash flows expected to be collected 5,027 — 839 (301 ) 5,565 Accretable yield (749 ) — 447 (1,350 ) (1,652 ) Carrying value of acquired loans $ 4,278 $ — $ 1,286 $ (1,651 ) $ 3,913 Activity during the nine-month period ended September 30, 2015 Dec 31, 2014 Effect of Income All other Sept 30, 2015 Contractually required principal and interest $ 6,532 $ — $ — $ (660 ) $ 5,872 Non-accretable difference (1,270 ) — 839 124 (307 ) Cash flows expected to be collected 5,262 — 839 (536 ) 5,565 Accretable yield (947 ) — 637 (1,342 ) (1,652 ) Carrying value of acquired loans $ 4,315 $ — $ 1,476 $ (1,878 ) $ 3,913

Loan Servicing (Tables)

Loan Servicing (Tables)	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Schedule of Loans Serviced Not Reported as Assets	Loans serviced for others are not reported as assets. The principal balances of these loans at September 30, 2015 and December 31, 2014 are as follows: September 30, December 31, Loan portfolios serviced for: Federal Home Loan Mortgage Corporation $ 461,121 $ 414,222 Other 3,613 3,986
Components of Net Loan Servicing Fees	The components of net loan servicing fees for the three and nine months ended September 30, 2015 and 2014 were as follows: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Loan servicing fees, net: Loan servicing fees $ 287 $ 253 $ 831 $ 720 Amortization of loan servicing fees (203 ) (180 ) (644 ) (547 ) Change in impairment — — — — Total $ 84 $ 73 $ 187 $ 173
Schedule of Estimated Amortization Expense	The weighted average amortization period is 6.77 years. Estimated amortization expense for each of the next three years is: 2015 $ 782 2016 552 2017 552

Share-Based Payments (Tables)

Share-Based Payments (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Fair Value Assumptions of Stock Options	The fair value of options granted was determined using the following weighted-average assumptions as of grant date. September 30, September 30, Risk-free interest rate 1.84 % 1.81 % Expected term 7.5 years 5.9 years Expected stock price volatility 25.00 % 10.85 % Dividend yield 0.22 % 0.23 %
Summary of Company's Stock Option Activities	A summary of the activity in the stock option plans for the nine months ended September 30, 2015 follows: Shares Weighted Weighted Aggregate Outstanding at beginning of year 1,210,660 $ 11.32 6.53 $ 7,244 Granted 226,782 20.78 Exercised (93,754 ) 11.53 Forfeited, expired, or cancelled (4,417 ) 19.02 Outstanding at period end 1,339,271 $ 12.88 6.39 $ 12,685 Vested or expected to vest 1,272,307 $ 12.88 6.39 $ 12,051 Exercisable at period end 829,072 $ 10.76 5.06 $ 9,606
Summary of Activity for Nonvested Restricted Share Awards	A summary of activity for non-vested restricted share awards for the nine months ended September 30, 2015 is as follows: Non-vested Shares Shares Weighted- Grant-Date Non-vested at beginning of year 102,710 $ 13.93 Granted 31,938 20.69 Vested (25,075 ) 14.08 Forfeited (3,709 ) 15.99 Non-vested at period end 105,864 $ 15.89

Regulatory Capital Matters (Tab

Regulatory Capital Matters (Tables)	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Actual and Required Capital Amounts and Ratios	The Company’s and Bank’s actual capital amounts and ratios are presented in the following table (in thousands): Actual Required To Be Well Amount Ratio Amount Ratio Amount Ratio September 30, 2015 Company common equity Tier 1 capital to risk-weighted assets $ 161,721 11.03 % $ 65,479 4.50 % $ 87,937 6.00 % Company Total Capital to risk weighted assets $ 178,516 12.18 % $ 116,407 8.00 % $ 146,562 10.00 % Company Tier 1 (Core) Capital to risk weighted assets $ 168,771 11.52 % $ 58,204 6.00 % $ 117,249 8.00 % Company Tier 1 (Core) Capital to average assets $ 168,771 8.90 % $ 75,824 4.00 % $ 94,781 5.00 % Bank common equity Tier 1 capital to risk-weighted assets $ 166,116 11.34 % $ 65,947 4.50 % $ 87,930 6.00 % Bank Total Capital to risk weighted assets $ 175,860 12.00 % $ 117,239 8.00 % $ 146,549 10.00 % Bank Tier 1 (Core) Capital to risk weighted assets $ 166,116 11.34 % $ 87,930 6.00 % $ 117,239 8.00 % Bank Tier 1 (Core) Capital to average assets $ 166,116 8.76 % $ 75,824 4.00 % $ 94,781 5.00 % December 31, 2014 Company Total Capital to risk weighted assets $ 114,475 12.30 % $ 74,464 8.00 % N/A N/A Company Tier 1 (Core) Capital to risk weighted assets $ 107,795 11.58 % $ 37,232 4.00 % N/A N/A Company Tier 1 (Core) Capital to average assets $ 107,795 8.57 % $ 50,291 4.00 % N/A N/A Bank Total Capital to risk weighted assets $ 113,830 12.23 % $ 74,447 8.00 % $ 93,059 10.00 % Bank Tier 1 (Core) Capital to risk weighted assets $ 107,150 11.51 % $ 37,223 4.00 % $ 55,835 6.00 % Bank Tier 1 (Core) Capital to average assets $ 107,150 8.52 % $ 50,279 4.00 % $ 62,849 5.00 %

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis, including financial assets and liabilities for which the Company has elected the fair value option, are summarized below: Fair Value Measurements at Quoted Prices Significant Significant Financial Assets Securities available for sale U.S. government sponsored entities and agencies $ — $ 14,418 $ — Mortgage-backed securities-residential — 514,599 — Mortgage-backed securities-commercial — 20,330 — State and political subdivisions — 75,073 — Total securities available for sale $ — $ 624,420 $ — Loans held for sale $ — $ 14,666 $ — Mortgage banking derivatives $ — $ 559 $ — Financial Liabilities Mortgage banking derivatives $ — $ 131 $ — Fair Value Measurements at Quoted Prices Significant Significant Financial Assets Securities available for sale U.S. government sponsored entities and agencies $ — $ 30,173 $ — U.S. Treasury Bills 20,000 — — Mortgage-backed securities-residential — 339,067 — Mortgage-backed securities-commercial — 6,465 — State and political subdivisions — — — Total securities available for sale $ 20,000 $ 375,705 $ — Loans held for sale $ — $ 18,462 $ — Mortgage banking derivatives $ — $ 285 $ — Financial Liabilities Mortgage banking derivatives $ — $ 132 $ —
Carrying Amount and Estimated Fair Value of Financial Instruments	The carrying amounts and estimated fair values of financial instruments, at September 30, 2015 and December 31, 2014 are as follows: Carrying Fair Value Measurements at Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 47,658 $ 47,658 $ — $ — $ 47,658 Securities available for sale 624,420 — 624,420 — 624,420 Certificates of deposit held at other financial institutions 250 — 250 — 250 Securities held to maturity 132,134 — 134,028 — 134,028 Loans held for sale 14,666 — 14,666 — 14,666 Net loans 1,114,082 — — 1,112,007 1,112,007 Restricted equity securities 7,691 n/a n/a n/a n/a Servicing rights, net 3,415 — 4,264 — 4,264 Accrued interest receivable 6,108 7 3,032 3,069 6,108 Financial liabilities Deposits $ 1,714,594 $ 956,892 $ 764,467 $ — $ 1,721,359 Federal funds purchased and repurchase agreements 37,618 — 37,618 — 37,618 Federal Home Loan Bank advances 57,000 — 57,123 — 57,123 Accrued interest payable 587 79 508 — 587 Carrying Fair Value Measurements at Amount Level 1 Level 2 Level 3 Total Financial assets Cash and cash equivalents $ 49,347 $ 49,347 $ — $ — $ 49,347 Securities available for sale 395,705 20,000 375,705 — 395,705 Certificates of deposit held at other financial institutions 250 — 250 — 250 Securities held to maturity 53,332 — 53,741 — 53,741 Loans held for sale 18,462 — 18,462 — 18,462 Net loans 780,508 — — 782,745 782,745 Restricted equity securities 5,349 n/a n/a n/a n/a Servicing rights, net 3,053 — 4,180 — 4,180 Accrued interest receivable 3,545 — 1,368 2,177 3,545 Financial liabilities Deposits $ 1,172,233 $ 848,158 $ 326,644 $ — $ 1,174,802 Federal funds purchased and repurchase agreements 39,078 — 39,078 — 39,078 Federal Home Loan Bank advances 19,000 — 19,146 — 19,146 Accrued interest payable 421 33 388 — 421

Securities Sold under Agreeme27

Securities Sold under Agreement to Repurchase (Tables)	9 Months Ended
	Sep. 30, 2015
Brokers and Dealers [Abstract]
Additional Details of Securities Sold under Agreement to Repurchase	The following table provides additional details as of September 30, 2015: As of September 30, 2015 U.S. Mortgage- Mortgage- Total Market value of securities pledged $ 6,039 $ 33,542 $ 3,471 $ 43,052 Borrowings related to pledged amounts $ 4,734 $ 29,623 $ 3,261 $ 37,618 Market value pledged as a % of borrowings 128 % 113 % 106 % 114 %

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Computation of Earnings per Share	The factors used in the earnings per share computation follow: Three Months Ended 2015 2014 Basic Net income available to common shareholders $ 5,125 $ 1,990 Less: earnings allocated to participating securities (52 ) (27 ) Net income allocated to common shareholders $ 5,073 $ 1,963 Weighted average common shares outstanding including participating securities 10,516,290 7,737,710 Less: Participating securities (107,502 ) (105,129 ) Average shares 10,408,788 7,632,581 Basic earnings per common share $ 0.49 $ 0.26 Diluted Net income allocated to common shareholders $ 5,073 $ 1,963 Weighted average common shares outstanding for basic earnings per common share 10,408,788 7,632,581 Add: Dilutive effects of assumed exercises of stock options 534,148 272,634 Add: Dilutive effects of assumed exercises of stock warrants 13,265 7,559 Average shares and dilutive potential common shares 10,956,201 7,912,774 Dilutive earnings per common share $ 0.46 $ 0.25 Nine Months Ended 2015 2014 Basic Net income available to common shareholders $ 11,341 $ 5,504 Less: earnings allocated to participating securities (127 ) (57 ) Net income allocated to common shareholders $ 11,214 $ 5,447 Weighted average common shares outstanding including participating securities 9,668,497 5,840,620 Less: Participating securities (108,617 ) (60,840 ) Average shares 9,559,880 5,779,780 Basic earnings per common share $ 1.17 $ 0.94 Diluted Net income allocated to common shareholders $ 11,214 $ 5,447 Weighted average common shares outstanding for basic earnings per common share 9,559,880 5,779,780 Add: Dilutive effects of assumed exercises of stock options 466,955 170,470 Add: Dilutive effects of assumed exercises of stock warrants 13,257 5,033 Average shares and dilutive potential common shares 10,040,092 5,955,283 Dilutive earnings per common share $ 1.12 $ 0.91

Capital Offering (Tables)

Capital Offering (Tables)	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Schedule of Net Proceeds	Net proceeds were as follows: Gross proceeds $ 55,440 Less: Stock offering costs (5,017 ) Net proceeds from issuance of common stock $ 50,423

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jul. 01, 2014
Business Acquisition [Line Items]
Goodwill		$ 9,124		$ 9,124
Aggregate amortization expense		$ 861
Acquisition related costs			$ 2,112
MidSouth Bank [Member]
Business Acquisition [Line Items]
Acquisition completed date		Jul. 1, 2014
Name of the acquired entity		MidSouth Bank
Acquisition agreement date		Nov. 19, 2013
Goodwill					$ 9,124
Loans acquired at fair value	$ 184,345		$ 184,345
Estimated discount to outstanding principal loan balance, value	$ 7,347
Estimated discount to outstanding principal loan balance, percentage	3.80%
Loans acquired, percentage	38.00%		38.00%
Increase in interest income			$ 6,049
Increase in net income available to common shareholders			$ 849
MidSouth Bank [Member] | Core Deposit Intangibles [Member]
Business Acquisition [Line Items]
Core deposit intangible					$ 3,060
Estimated economic life		8 years 2 months 12 days
PCI Loans [Member]
Business Acquisition [Line Items]
Acquired loans with credit impaired		$ 3,913		$ 4,315
PCI Loans [Member] | MidSouth Bank [Member]
Business Acquisition [Line Items]
Acquired loans with credit impaired		$ 5,527

Acquisitions - Contractually Re

Acquisitions - Contractually Required Principal and Interest Cash Payments, Management's Estimates of Expected Total Cash Payments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Jul. 01, 2014
Business Acquisition [Line Items]
Contractually required principal and interest	$ 5,872	$ 6,000	$ 6,532
Non-accretable difference	$ (307)	$ (973)	$ (1,270)
MidSouth Bank [Member]
Business Acquisition [Line Items]
Contractually required principal and interest				$ 8,510
Non-accretable difference				(1,745)
Cash flows expected to be collected				6,765
Accretable yield				(1,238)
Total purchased credit-impaired loans acquired				$ 5,527

Acquisitions - Pro-Forma Financ

Acquisitions - Pro-Forma Financial Information and Actual Results of Acquisition (Detail) - MidSouth Bank [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / shares
Business Acquisition [Line Items]
Net interest income	$ 31,619
Net income available to common shareholders	$ 6,353
Earnings per share-basic | $ / shares	$ 0.82
Earnings per share-diluted | $ / shares	$ 0.80

Securities - Summary of Amortiz

Securities - Summary of Amortized Cost and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 617,417	$ 392,179
Gross Unrealized Gains	8,178	5,043
Gross Unrealized Losses	(1,175)	(1,517)
Fair Value	624,420	395,705
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,211	30,070
Gross Unrealized Gains	253	417
Gross Unrealized Losses	(46)	(314)
Fair Value	14,418	30,173
Mortgage-Backed Securities: Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	508,817	335,677
Gross Unrealized Gains	6,868	4,593
Gross Unrealized Losses	(1,086)	(1,203)
Fair Value	514,599	339,067
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,169	6,432
Gross Unrealized Gains	161	33
Fair Value	20,330	6,465
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	74,220
Gross Unrealized Gains	896
Gross Unrealized Losses	(43)
Fair Value	$ 75,073
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		20,000
Fair Value		$ 20,000

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Held to Maturity Securities Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 132,134	$ 53,332
Gross Unrecognized Gains	2,276	1,068
Gross Unrecognized Losses	(382)	(659)
Fair Value	134,028	53,741
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	3,301	5,550
Gross Unrecognized Gains	13	162
Gross Unrecognized Losses	(42)	(87)
Fair Value	3,272	5,625
Mortgage-Backed Securities: Residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	31,691	38,587
Gross Unrecognized Gains	658	555
Gross Unrecognized Losses	(318)	(562)
Fair Value	32,031	38,580
State and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	97,142	9,195
Gross Unrecognized Gains	1,605	351
Gross Unrecognized Losses	(22)	(10)
Fair Value	$ 98,725	$ 9,536

Securities - Summary of Sales a

Securities - Summary of Sales and Calls of Available for Sale Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Available-for-sale Securities [Abstract]
Proceeds	$ 19,776	$ 9,767	$ 54,064	$ 34,087
Gross gains	95	31	485	256
Gross losses	$ (90)	$ (9)	$ (105)	$ (163)

Securities - Summary of Calls o

Securities - Summary of Calls of Held to Maturity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Held-to-maturity Securities [Abstract]
Proceeds			$ 2,300
Gross gains			149
Gross losses	$ 0	$ 0	$ 0	$ 0

Securities - Schedule of Amor37

Securities - Schedule of Amortized Cost and Fair Value of Investment Securities Portfolio by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Available for sale
Amortized Cost, Three months or less	$ 0
Amortized Cost, Over three months through one year	0
Amortized Cost, Over one year through five years	0
Amortized Cost, Over five years through ten years	7,761
Amortized Cost, Over ten years	80,670
Amortized Cost	617,417	$ 392,179
Held to maturity
Amortized Cost, Three months or less	0
Amortized Cost, Over three months through one year	0
Amortized Cost, Over one year through five years	1,307
Amortized Cost, Over five years through ten years	3,024
Amortized Cost, Over ten years	96,112
Amortized Cost, Mortgage-backed securities: residential	31,691
Amortized Cost	132,134	53,332
Available for sale
Fair Value, Three months or less	0
Fair Value, Over three months through one year	0
Fair Value, Over one year through five years	0
Fair Value, Over five years through ten years	8,009
Fair Value, Over ten years	81,482
Mortgage-backed securities: residential	514,599
Mortgage-backed securities: commercial	20,330
Fair Value, Total	624,420	395,705
Held to maturity
Fair Value, Three months or less	0
Over three months through one year	0
Fair Value, Over one year through five years	1,366
Fair Value, Over five years through ten years	3,091
Fair Value, Over ten years	97,540
Fair Value, Mortgage-backed securities: residential	32,031
Fair Value, Total	134,028	53,741
Mortgage-Backed Securities: Residential [Member]
Available for sale
Mortgage-backed securities:	508,817
Amortized Cost	508,817	335,677
Held to maturity
Amortized Cost	31,691	38,587
Available for sale
Fair Value, Total	514,599	339,067
Held to maturity
Fair Value, Total	32,031	38,580
Mortgage-Backed Securities: Commercial [Member]
Available for sale
Mortgage-backed securities:	20,169
Amortized Cost	20,169	6,432
Available for sale
Fair Value, Total	$ 20,330	$ 6,465

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	Sep. 30, 2015USD ($)Securities	Dec. 31, 2014USD ($)Securities
Marketable Securities [Line Items]
Carrying value of pledged securities	$ 467,080	$ 366,764
Other than US Government Sponsored Entities and Agencies [Member]
Marketable Securities [Line Items]
Amount of holdings of securities of any one issuer | Securities	0	0

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Losses and Fair Value by Major Security Type (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	$ 80,205	$ 69,077
Less Than 12 Months Available for sale Unrealized Losses	(663)	(324)
12 Months or Longer Available for sale Fair Value	27,907	50,171
12 Months or Longer Available for sale Unrealized Losses	(512)	(1,193)
Available for sale Fair Value, Total	108,112	119,248
Available for sale Unrealized Losses, Total	(1,175)	(1,517)
Less Than 12 Months Held to maturity Fair Value	8,450	5,753
Less Than 12 Months Held to maturity Unrealized Losses	(49)	(26)
12 Months or Longer Held to maturity Fair Value	6,669	16,506
12 Months or Longer Held to maturity Unrealized Losses	(333)	(633)
Held to maturity Fair Value, Total	15,119	22,259
Held to maturity Unrealized Losses, Total	(382)	(659)
U.S. Government Sponsored Entities and Agencies [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value		9,999
Less Than 12 Months Available for sale Unrealized Losses		(1)
12 Months or Longer Available for sale Fair Value	1,654	8,232
12 Months or Longer Available for sale Unrealized Losses	(46)	(313)
Available for sale Fair Value, Total	1,654	18,231
Available for sale Unrealized Losses, Total	(46)	(314)
Less Than 12 Months Held to maturity Fair Value	1,979
Less Than 12 Months Held to maturity Unrealized Losses	(21)
12 Months or Longer Held to maturity Fair Value	979	2,913
12 Months or Longer Held to maturity Unrealized Losses	(21)	(87)
Held to maturity Fair Value, Total	2,958	2,913
Held to maturity Unrealized Losses, Total	(42)	(87)
Mortgage-Backed Securities: Residential [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	77,224	59,078
Less Than 12 Months Available for sale Unrealized Losses	(620)	(323)
12 Months or Longer Available for sale Fair Value	26,253	41,939
12 Months or Longer Available for sale Unrealized Losses	(466)	(880)
Available for sale Fair Value, Total	103,477	101,017
Available for sale Unrealized Losses, Total	(1,086)	(1,203)
Less Than 12 Months Held to maturity Fair Value	1,800	5,246
Less Than 12 Months Held to maturity Unrealized Losses	(6)	(25)
12 Months or Longer Held to maturity Fair Value	5,690	13,001
12 Months or Longer Held to maturity Unrealized Losses	(312)	(537)
Held to maturity Fair Value, Total	7,490	18,247
Held to maturity Unrealized Losses, Total	(318)	(562)
State and Political Subdivisions [Member]
Schedule Of Held To Maturity And Available For Sale Securities [Line Items]
Less Than 12 Months Available for Sale Fair Value	2,981
Less Than 12 Months Available for sale Unrealized Losses	(43)
Available for sale Fair Value, Total	2,981
Available for sale Unrealized Losses, Total	(43)
Less Than 12 Months Held to maturity Fair Value	4,671	507
Less Than 12 Months Held to maturity Unrealized Losses	(22)	(1)
12 Months or Longer Held to maturity Fair Value		592
12 Months or Longer Held to maturity Unrealized Losses		(9)
Held to maturity Fair Value, Total	4,671	1,099
Held to maturity Unrealized Losses, Total	$ (22)	$ (10)

Loans - Summary of Loans (Detai

Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,122,028		$ 783,932
Deferred loan fees, net	(2,115)		(1,059)
Total loans that are not PCI loans	1,119,913		782,873
Allowance for loan losses	(9,744)	$ (8,016)	(6,680)	$ (5,883)	$ (5,771)	$ (4,900)
Net loans	1,114,082		780,508
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Construction and land development	334,208		239,225
Allowance for loan losses	(3,028)	(2,567)	(2,690)	(2,141)	(1,910)	(1,552)
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	219,341		76,570
Allowance for loan losses	(2,562)	(1,324)	(650)	(576)	(508)	(337)
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer and other	6,893		8,025
Allowance for loan losses	(39)	$ (65)	(55)	$ (49)	$ (53)	$ (98)
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,913		4,315
PCI Loans [Member] | Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	77		77
PCI Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,675		1,624
PCI Loans [Member] | Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans			2
Commercial Real Estate Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonfarm, nonresidential	303,657		240,975
Commercial Real Estate Financing Receivable [Member] | PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,452		1,798
Commercial Real Estate, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other	9,478		5,377
Real Estate Residential Closed-end 1-4 Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Closed-end 1-4 family	144,080		130,631
Real Estate Residential Closed-end 1-4 Family [Member] | PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	707		706
Residential Real Estate, Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other	104,371		83,129
Residential Real Estate, Other [Member] | PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2		$ 108

Loans - Activity in Allowance f

Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 8,016	$ 5,771	$ 6,680	$ 4,900
Provision (credit) for loan losses	1,724	664	3,154	1,489
Loans charged-off	(63)	(555)	(168)	(555)
Recoveries	67	3	78	49
Total ending allowance balance	9,744	5,883	9,744	5,883
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,567	1,910	2,690	1,552
Provision (credit) for loan losses	461	231	338	589
Total ending allowance balance	3,028	2,141	3,028	2,141
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,321	1,740	1,494	1,511
Provision (credit) for loan losses	135	173	962	402
Loans charged-off		(540)		(540)
Total ending allowance balance	2,456	1,373	2,456	1,373
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,739	1,560	1,791	1,402
Provision (credit) for loan losses	(71)	192	(114)	304
Loans charged-off	(15)	(11)	(32)	(11)
Recoveries	6	3	14	49
Total ending allowance balance	1,659	1,744	1,659	1,744
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,324	508	650	337
Provision (credit) for loan losses	1,253	72	1,927	243
Loans charged-off	(15)	(4)	(15)	(4)
Total ending allowance balance	2,562	576	2,562	576
Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	65	53	55	98
Provision (credit) for loan losses	(54)	(4)	41	(49)
Loans charged-off	(33)		(121)
Recoveries	61		64
Total ending allowance balance	$ 39	$ 49	$ 39	$ 49

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($)	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jul. 01, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal amount	$ 3,337,000		$ 2,533,000
Allowance for loan losses	9,744,000	$ 8,016,000	$ 6,680,000	$ 5,883,000		$ 5,771,000	$ 4,900,000
Non PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated credit discount	2,710,000				$ 5,014,000
Estimated fair value	104,853,000				178,818,000
Unpaid principal amount	107,563,000				$ 183,832,000
Allowance for loan losses	0
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for PCI loans	$ 5,000			$ 0

Loans - Allowance for Loan Loss

Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method (Detail) - USD ($)	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Individually evaluated for impairment	$ 80,000		$ 18,000
Allowance for loan losses, Collectively evaluated for impairment	9,659,000		6,662,000
Total ending allowance balance	9,744,000	$ 8,016,000	6,680,000	$ 5,883,000	$ 5,771,000	$ 4,900,000
Loans, Individually evaluated for impairment	1,750,000		946,000
Loans, Collectively evaluated for impairment	1,120,278,000		782,986,000
Aging of Recorded Investment, Total	1,125,941,000		788,247,000
PCI Loans [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Purchased credit-impaired loans	5,000			0
Purchased credit-impaired loans	3,913,000		4,315,000
Construction and Land Development [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	3,028,000		2,690,000
Total ending allowance balance	3,028,000	2,567,000	2,690,000	2,141,000	1,910,000	1,552,000
Loans, Collectively evaluated for impairment	334,208,000		239,225,000
Aging of Recorded Investment, Total	334,285,000		239,302,000
Construction and Land Development [Member] | PCI Loans [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Purchased credit-impaired loans	77,000		77,000
Commercial Real Estate [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	2,451,000		1,494,000
Total ending allowance balance	2,456,000	2,321,000	1,494,000	1,373,000	1,740,000	1,511,000
Loans, Individually evaluated for impairment	914,000		835,000
Loans, Collectively evaluated for impairment	312,221,000		245,517,000
Aging of Recorded Investment, Total	314,587,000		248,150,000
Commercial Real Estate [Member] | PCI Loans [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Purchased credit-impaired loans	5,000
Purchased credit-impaired loans	1,452,000		1,798,000
Residential Real Estate [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	1,659,000		1,791,000
Total ending allowance balance	1,659,000	1,739,000	1,791,000	1,744,000	1,560,000	1,402,000
Loans, Individually evaluated for impairment	709,000		93,000
Loans, Collectively evaluated for impairment	247,742,000		213,667,000
Aging of Recorded Investment, Total	249,160,000		214,574,000
Residential Real Estate [Member] | PCI Loans [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Purchased credit-impaired loans	709,000		814,000
Commercial and Industrial [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Individually evaluated for impairment	80,000		18,000
Allowance for loan losses, Collectively evaluated for impairment	2,482,000		632,000
Total ending allowance balance	2,562,000	1,324,000	650,000	576,000	508,000	337,000
Loans, Individually evaluated for impairment	102,000		18,000
Loans, Collectively evaluated for impairment	219,239,000		76,552,000
Aging of Recorded Investment, Total	221,016,000		78,194,000
Commercial and Industrial [Member] | PCI Loans [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Purchased credit-impaired loans	1,675,000		1,624,000
Consumer and Other [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Allowance for loan losses, Collectively evaluated for impairment	39,000		55,000
Total ending allowance balance	39,000	$ 65,000	55,000	$ 49,000	$ 53,000	$ 98,000
Loans, Individually evaluated for impairment	25,000
Loans, Collectively evaluated for impairment	6,868,000		8,025,000
Aging of Recorded Investment, Total	$ 6,893,000		8,027,000
Consumer and Other [Member] | PCI Loans [Member]
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]
Purchased credit-impaired loans			$ 2,000

Loans - Summary of Impaired Loa

Loans - Summary of Impaired Loans by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	$ 3,257		$ 3,257		$ 2,515
Unpaid Principal Balance	3,337		3,337		2,533
Recorded Investment, With no allowance recorded	1,670		1,670		928
Recorded Investment	1,750		1,750		946
Unpaid Principal Balance, With an allowance recorded	80		80		18
Recorded Investment, With an allowance recorded	80		80		18
Allowance for Loan Losses Allocated	80		80		18
Average Recorded Investment, With no allowance recorded	1,711	$ 211	1,463	$ 71
Average Recorded Investment, With an allowance recorded	106	1,258	60	1,378
Average Recorded Investment	1,817	1,469	1,523	1,449
Commercial Real Estate Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	2,501		2,501		2,422
Recorded Investment, With no allowance recorded	914		914		835
Average Recorded Investment, With no allowance recorded	918	211	873	71
Average Recorded Investment, With an allowance recorded		1,194		837
Residential Real Estate, Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	709		709
Recorded Investment, With no allowance recorded	709		709
Average Recorded Investment, With no allowance recorded	712		317
Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded					93
Recorded Investment, With no allowance recorded					93
Average Recorded Investment, With no allowance recorded	33		188
Average Recorded Investment, With an allowance recorded				476
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	22		22
Recorded Investment, With no allowance recorded	22		22
Unpaid Principal Balance, With an allowance recorded	80		80		18
Recorded Investment, With an allowance recorded	80		80		18
Allowance for Loan Losses Allocated	80		80		$ 18
Average Recorded Investment, With no allowance recorded	23		77
Average Recorded Investment, With an allowance recorded	90	$ 64	50	$ 65
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no allowance recorded	25		25
Recorded Investment, With no allowance recorded	25		25
Average Recorded Investment, With no allowance recorded	25		8
Average Recorded Investment, With an allowance recorded	$ 16		$ 10

Loans - Schedule of Recorded In

Loans - Schedule of Recorded Investment in Nonaccrual and Loans Past Due Over 90 Days on Accrual by Class of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]
Recorded Investment, Nonaccrual	$ 835	$ 835
Recorded Investment, Loans Past Due Over 90 Days		316
Commercial Real Estate Financing Receivable [Member]
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]
Recorded Investment, Nonaccrual	$ 835	835
Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]
Recorded Investment, Loans Past Due Over 90 Days		$ 316

Loans - Schedule of Aging of Re

Loans - Schedule of Aging of Recorded Investment in Past Due Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	$ 3,156	$ 2,233
Aging of Recorded Investment, Loans Not Past Due	1,118,872	781,699
Aging of Recorded Investment, Total	1,125,941	788,247
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1,358	354
Aging of Recorded Investment, Loans Not Past Due	332,850	238,871
Aging of Recorded Investment, Total	334,285	239,302
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	123	212
Aging of Recorded Investment, Loans Not Past Due	219,218	76,358
Aging of Recorded Investment, Total	221,016	78,194
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1
Aging of Recorded Investment, Loans Not Past Due	6,892	8,025
Aging of Recorded Investment, Total	6,893	8,027
PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans	3,913	4,315
PCI Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans	77	77
PCI Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans	1,675	1,624
PCI Loans [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans		2
Commercial Real Estate Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	835	835
Aging of Recorded Investment, Loans Not Past Due	302,822	240,140
Aging of Recorded Investment, Total	305,109	242,773
Commercial Real Estate Financing Receivable [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans	1,452	1,798
Commercial Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Loans Not Past Due	9,478	5,377
Aging of Recorded Investment, Total	9,478	5,377
Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	839	780
Aging of Recorded Investment, Loans Not Past Due	143,241	129,851
Aging of Recorded Investment, Total	144,787	131,337
Real Estate Residential Closed-end 1-4 Family [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans	707	706
Residential Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		52
Aging of Recorded Investment, Loans Not Past Due	104,371	83,077
Aging of Recorded Investment, Total	104,373	83,237
Residential Real Estate, Other [Member] | PCI Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, PCI Loans	2	108
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	2,321	705
30 to 59 Days Past Due [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1,358	354
30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	123
30 to 59 Days Past Due [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	1
30 to 59 Days Past Due [Member] | Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	839	299
30 to 59 Days Past Due [Member] | Residential Real Estate, Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		52
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		377
60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		212
60 to 89 Days Past Due [Member] | Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		165
Greater Than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	835	1,151
Greater Than 90 Days Past Due [Member] | Commercial Real Estate Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due	$ 835	835
Greater Than 90 Days Past Due [Member] | Real Estate Residential Closed-end 1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Aging of Recorded Investment, Total Past Due		$ 316

Loans - Summary of Risk Categor

Loans - Summary of Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Risk Category Of Loans [Line Items]
Total Loans	$ 1,125,941	$ 788,247
Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	334,285	239,302
Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	221,016	78,194
Consumer and Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	6,893	8,027
Commercial Real Estate Financing Receivable [Member]
Risk Category Of Loans [Line Items]
Total Loans	305,109	242,773
Commercial Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	9,478	5,377
Real Estate Residential Closed-end 1-4 Family [Member]
Risk Category Of Loans [Line Items]
Total Loans	144,787	131,337
Residential Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	104,373	83,237
Pass [Member]
Risk Category Of Loans [Line Items]
Total Loans	1,119,690	780,761
Pass [Member] | Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	334,208	239,225
Pass [Member] | Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	219,522	76,552
Pass [Member] | Consumer and Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	6,868	8,025
Pass [Member] | Commercial Real Estate Financing Receivable [Member]
Risk Category Of Loans [Line Items]
Total Loans	302,387	239,584
Pass [Member] | Commercial Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	9,478	5,377
Pass [Member] | Real Estate Residential Closed-end 1-4 Family [Member]
Risk Category Of Loans [Line Items]
Total Loans	143,564	128,869
Pass [Member] | Residential Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	103,663	83,129
Substandard [Member]
Risk Category Of Loans [Line Items]
Total Loans	6,251	7,486
Substandard [Member] | Construction and Land Development [Member]
Risk Category Of Loans [Line Items]
Total Loans	77	77
Substandard [Member] | Commercial and Industrial [Member]
Risk Category Of Loans [Line Items]
Total Loans	1,494	1,642
Substandard [Member] | Consumer and Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	25	2
Substandard [Member] | Commercial Real Estate Financing Receivable [Member]
Risk Category Of Loans [Line Items]
Total Loans	2,722	3,189
Substandard [Member] | Real Estate Residential Closed-end 1-4 Family [Member]
Risk Category Of Loans [Line Items]
Total Loans	1,223	2,468
Substandard [Member] | Residential Real Estate, Other [Member]
Risk Category Of Loans [Line Items]
Total Loans	$ 710	$ 108

Loans -Summary of Total Contrac

Loans -Summary of Total Contractually Required Principal and Interest Cash Payments, Management's Estimate of Expected Total Cash Payments and Carrying Value of Purchased Credit-Impaired ("PCI") Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Contractually required principal and interest	$ 5,872	$ 6,000	$ 6,532
Non-accretable difference	(307)	(973)	(1,270)
Cash flows expected to be collected	5,565	5,027	5,262
Accretable yield	(1,652)	(749)	(947)
Carrying value of acquired loans	3,913	$ 4,278	4,315
Allowance for loan losses	(5)
Carrying value less allowance for loan losses	$ 3,908		$ 4,315

Loans - Summary of Changes in T

Loans - Summary of Changes in Total Contractually Required Principal and Interest Cash Payments, Managements Estimate of Expected Total Cash Payments and Carrying Value of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Contractually required principal and interest	$ 5,872	$ 5,872	$ 6,000	$ 6,532
Non-accretable difference	(307)	(307)	(973)	(1,270)
Cash flows expected to be collected	5,565	5,565	5,027	5,262
Accretable yield	(1,652)	(1,652)	(749)	(947)
Carrying value of acquired loans	3,913	3,913	$ 4,278	$ 4,315
Contractually required principal and interest, Effect of Acquisitions	0	0
Non-accretable difference, Effect of Acquisitions	0	0
Cash flows expected to be collected, Effect of Acquisitions	0	0
Accretable yield, Effect of Acquisitions	0	0
Carrying value of acquired loans, Effect of Acquisitions	0	0
Contractually required principal and interest, Income Accretion	0	0
Non-accretable difference, Income Accretion	839	839
Cash flows expected to be collected, Income Accretion	839	839
Accretable yield, Income Accretion	447	637
Carrying value of acquired loans, Income Accretion	1,286	1,476
Contractually required principal and interest, All other Adjustments	(128)	(660)
Non-accretable difference, All other Adjustments	(173)	124
Cash flows expected to be collected, All other Adjustments	(301)	(536)
Accretable yield, All other Adjustments	(1,350)	(1,342)
Carrying value of acquired loans, All other Adjustments	$ (1,651)	$ (1,878)

Loan Servicing - Schedule of Lo

Loan Servicing - Schedule of Loans Serviced Not Reported as Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Federal Home Loan Mortgage Corporation [Member]
Loans Servicing For Institutional Investors [Line Items]
Loan servicing rights, at fair value	$ 461,121	$ 414,222
Other Serviced Loans [Member]
Loans Servicing For Institutional Investors [Line Items]
Loan servicing rights, at fair value	$ 3,613	$ 3,986

Loan Servicing - Components of

Loan Servicing - Components of Net Loan Servicing Fees (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Transfers and Servicing [Abstract]
Loan servicing fees	$ 287	$ 253	$ 831	$ 720
Amortization of loan servicing fees	(203)	(180)	(644)	(547)
Change in impairment	0	0	0	0
Total	$ 84	$ 73	$ 187	$ 173

Loan Servicing - Additional Inf

Loan Servicing - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Transfers and Servicing [Abstract]
Fair value of servicing rights	$ 4,264	$ 4,180
Weighted average discount rate	10.50%	10.50%
Weighted average prepayment speed	11.50%	10.80%
Weighted average amortization period	6 years 9 months 7 days

Loan Servicing - Schedule of Es

Loan Servicing - Schedule of Estimated Amortization Expense (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,015	$ 782
2,016	552
2,017	$ 552

Share-Based Payments - Addition

Share-Based Payments - Additional Information (Detail) - USD ($)	Jul. 01, 2014	Feb. 28, 2015	Jun. 30, 2014	Apr. 30, 2013	Apr. 30, 2010	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants exercised						4,970	0
Cash proceeds on warrants exercised						$ 60,000
Aggregate intrinsic value of warrants exercised						$ 46,000
Trigger value of 2010 warrant, price per share						$ 15
Warrants, contingent redemption price						$ 1
Number of shares authorized for issuance						2,364,492
Exercise price of options						$ 12.88
Share-based compensation arrangements by share-based payment award, estimated grant date fair value	$ 14.50					$ 6.41	$ 4.12
Exercise of stock options						$ 780,000
Intrinsic value of shares exercised						839,000
Unrecognized compensation cost, nonvested stock options						$ 1,733,000
Unrecognized compensation cost, period of recognition						1 year 8 months 12 days
2010 Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant shares issued						32,425
Warrant exercise price per share						$ 12
Warrants exercisable period						7 years
Warrants outstanding						26,907
2007 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options authorized								551,250
Increase in shares authorized				1,500,000
Increased number of authorized shares		4,000,000	2,000,000
Options contractual term						10 years
2007 Stock Option Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares						3 years
2007 Stock Option Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares						5 years
Two Thousand Ten Amended Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options authorized					1,000,000
MidSouth Bank [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares of common stock	137,280
Exercise price of options	$ 8.57
Share-based compensation arrangements by share-based payment award, estimated grant date fair value	$ 6.31
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense						$ 0
Common Stock [Member] | MidSouth Bank [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock options converted	322,300
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, nonvested stock options						$ 1,524,000
Unrecognized compensation cost, period of recognition						3 years 6 months
Number of shares granted						87,374
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares						3 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares						5 years

Share-Based Payments - Fair Val

Share-Based Payments - Fair Value Assumptions of Stock Options (Detail)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	1.84%	1.81%
Expected term	7 years 6 months	5 years 10 months 24 days
Expected stock price volatility	25.00%	10.85%
Dividend yield	0.22%	0.23%

Share-Based Payments - Summary

Share-Based Payments - Summary of Company's Stock Option Activities (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Outstanding, Beginning Balance	1,210,660
Shares, Granted	226,782
Shares, Exercised	(93,754)
Shares, Forfeited, expired, or canceled	(4,417)
Shares, Outstanding, Ending Balance	1,339,271	1,210,660
Shares, Vested or expected to vest	1,272,307
Shares, Exercisable at period end	829,072
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 11.32
Weighted Average Exercise Price, Granted	20.78
Weighted Average Exercise Price, Exercised	11.53
Weighted Average Exercise Price, Forfeited, expired, or cancelled	19.02
Weighted Average Exercise Price, Outstanding, Ending Balance	12.88	$ 11.32
Weighted Average Exercise Price, Vested or expected to vest	12.88
Weighted Average Exercise Price, Exercisable at period end	$ 10.76
Weighted Average Remaining Contractual Term, beginning of year	6 years 4 months 21 days	6 years 6 months 11 days
Weighted Average Remaining Contractual Term, Vested or expected to vest	6 years 4 months 21 days
Weighted Average Remaining Contractual Term, Exercisable at period end	5 years 22 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 12,685	$ 7,244
Aggregate Intrinsic Value, Vested or expected to vest	12,051
Aggregate Intrinsic Value, Exercisable at period end	$ 9,606

Share-Based Payments - Summar57

Share-Based Payments - Summary of Activity for Nonvested Restricted Share Awards (Detail) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested, Beginning Balance	102,710
Shares, Granted	31,938
Shares, Vested	(25,075)
Shares, Forfeited	(3,709)
Shares, Nonvested, Ending Balance	105,864
Weighted-Average Grant-Date Fair Value, Nonvested, Beginning Balance | $ / shares	$ 13.93
Weighted-Average Grant-Date Fair Value, Granted | $ / shares	20.69
Weighted-Average Grant-Date Fair Value, Vested | $ / shares	14.08
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares	15.99
Weighted-Average Grant-Date Fair Value, Nonvested, Ending Balance | $ / shares	$ 15.89

Regulatory Capital Matters - Ac

Regulatory Capital Matters - Actual and Required Capital Amounts and Ratios (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Bank common equity Tier 1 capital to risk weighted assets, Actual Amount	$ 161,721
Total Capital to risk weighted assets	178,516	$ 114,475
Tier 1 (Core) Capital to risk weighted assets, Actual Amount	168,771	107,795
Tier 1 (Core) Capital to average assets, Actual Amount	$ 168,771	$ 107,795
Bank common equity Tier 1 capital to risk weighted assets	11.03%
Total Capital to risk weighted assets, Actual Ratio	12.18%	12.30%
Tier 1 (Core) Capital to risk weighted assets, Actual Ratio	11.52%	11.58%
Tier 1 (Core) Capital to average assets, Actual Ratio	8.90%	8.57%
Bank common equity Tier 1 capital to risk weighted assets	$ 65,479
Total Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	116,407	$ 74,464
Tier 1 (Core) Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	58,204	37,232
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Amount	$ 75,824	$ 50,291
Bank common equity Tier 1 capital to risk weighted assets	4.50%
Total Capital to risk weighted assets, Required For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 (Core) Capital to risk weighted assets, Required For Capital Adequacy Purposes Ratio	6.00%	4.00%
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Ratio	4.00%	4.00%
Bank common equity Tier 1 capital to risk-weighted assets	$ 87,937
Total Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	146,562
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	117,249
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 94,781
Bank common equity Tier 1 capital to risk-weighted assets	6.00%
Total Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	10.00%
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	8.00%
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	5.00%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Bank common equity Tier 1 capital to risk weighted assets, Actual Amount	$ 166,116
Total Capital to risk weighted assets	175,860	$ 113,830
Tier 1 (Core) Capital to risk weighted assets, Actual Amount	166,116	107,150
Tier 1 (Core) Capital to average assets, Actual Amount	$ 166,116	$ 107,150
Bank common equity Tier 1 capital to risk weighted assets	11.34%
Total Capital to risk weighted assets, Actual Ratio	12.00%	12.23%
Tier 1 (Core) Capital to risk weighted assets, Actual Ratio	11.34%	11.51%
Tier 1 (Core) Capital to average assets, Actual Ratio	8.76%	8.52%
Bank common equity Tier 1 capital to risk weighted assets	$ 65,947
Total Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	117,239	$ 74,447
Tier 1 (Core) Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	87,930	37,223
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Amount	$ 75,824	$ 50,279
Bank common equity Tier 1 capital to risk weighted assets	4.50%
Total Capital to risk weighted assets, Required For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 (Core) Capital to risk weighted assets, Required For Capital Adequacy Purposes Ratio	6.00%	4.00%
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Ratio	4.00%	4.00%
Bank common equity Tier 1 capital to risk-weighted assets	$ 87,930
Total Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	146,549	$ 93,059
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	117,239	55,835
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 94,781	$ 62,849
Bank common equity Tier 1 capital to risk-weighted assets	6.00%
Total Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	10.00%	10.00%
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	8.00%	6.00%
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	5.00%	5.00%

Regulatory Capital Matters - Ad

Regulatory Capital Matters - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Description of dividend restriction pertaining to the dividends that the company could declare	13,836 plus any 2015 net profits retained to the date of declaration

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 624,420	$ 395,705
Loans held for sale	14,666	18,462
U.S. Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	14,418	30,173
Mortgage-Backed Securities: Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	514,599	339,067
Mortgage-Backed Securities: Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	20,330	6,465
U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale		20,000
State and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	75,073
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale		20,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale		20,000
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]
Total securities available for sale	624,420	375,705
Loans held for sale	14,666	18,462
Mortgage banking derivatives	559	285
Mortgage banking derivatives	131	132
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	14,418	30,173
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities: Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	514,599	339,067
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities: Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	20,330	$ 6,465
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 75,073

Fair Value - Additional informa

Fair Value - Additional information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value Measurements Of Financial Instruments [Line Items]
Change in fair value related to loans held for sale	$ 2,463,000	$ 1,875,000	$ 5,573,000	$ 4,226,000
Change in fair value of loans held for sale	248,000	217,000	(22,000)	755,000
Carrying amount of impaired loans with specific allocations	1,750,000		1,750,000		$ 946,000
Additional provision for loan losses	1,724,000	664,000	3,154,000	1,489,000
Foreclosed assets	206,000		206,000		715,000
Write-down value during period	0	0	0	0
Fair Value [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Carrying amount of impaired loans with specific allocations	0		0		$ 0
Changes Measurement [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Additional provision for loan losses	0	$ (7,000)	0	$ 39,000
Loans Held For Sale [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Unpaid principal balance of loans held for sale	$ 14,124,000		14,124,000
Change in fair value related to loans held for sale			$ 542,000
Maximum [Member] | Loans Held For Sale [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Term of loan			90 days

Fair Value - Carrying Amount an

Fair Value - Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 47,658	$ 49,347	$ 36,657	$ 18,217
Securities available for sale	624,420	395,705
Certificates of deposit held at other financial institutions	250	250
Securities held to maturity, Carrying Amount	132,134	53,332
Securities held to maturity, Fair Value	134,028	53,741
Loans held for sale, Fair Value	14,666	18,462
Net loans, Carrying Amount	1,114,082	780,508
Servicing rights, net, Carrying Amount	3,415	3,053
Servicing rights, net, Fair Value	4,264	4,180
Accrued interest receivable	6,108	3,545
Deposits, Carrying Amount	1,714,594	1,172,233
Federal funds purchased and repurchase agreements, Carrying Amount	37,618	39,078
Federal Home Loan Bank advances, Carrying Amount	57,000	19,000
Accrued interest payable	587	421
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents , Fair Value	47,658	49,347
Securities available for sale	624,420	395,705
Certificates of deposit held at other financial institutions, Fair Value	250	250
Securities held to maturity, Fair Value	134,028	53,741
Loans held for sale, Fair Value	14,666	18,462
Net loans, Fair Value	1,112,007	782,745
Restricted equity securities, Fair Value	0	0
Servicing rights, net, Fair Value	4,264	4,180
Accrued interest receivable	6,108	3,545
Deposits, Fair Value	1,721,359	1,174,802
Federal funds purchased and repurchase agreements, Fair Value	37,618	39,078
Federal Home Loan Bank advances, Fair Value	57,123	19,146
Accrued interest payable	587	421
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents , Fair Value	47,658	49,347
Securities available for sale		20,000
Restricted equity securities, Fair Value	0	0
Accrued interest receivable	7
Deposits, Fair Value	956,892	848,158
Accrued interest payable	79	33
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	624,420	375,705
Certificates of deposit held at other financial institutions, Fair Value	250	250
Securities held to maturity, Fair Value	134,028	53,741
Loans held for sale, Fair Value	14,666	18,462
Restricted equity securities, Fair Value	0	0
Servicing rights, net, Fair Value	4,264	4,180
Accrued interest receivable	3,032	1,368
Deposits, Fair Value	764,467	326,644
Federal funds purchased and repurchase agreements, Fair Value	37,618	39,078
Federal Home Loan Bank advances, Fair Value	57,123	19,146
Accrued interest payable	508	388
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net loans, Fair Value	1,112,007	782,745
Restricted equity securities, Fair Value	0	0
Accrued interest receivable	3,069	2,177
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	47,658	49,347
Securities available for sale	624,420	395,705
Certificates of deposit held at other financial institutions	250	250
Securities held to maturity, Carrying Amount	132,134	53,332
Loans held for sale, Carrying Amount	14,666	18,462
Net loans, Carrying Amount	1,114,082	780,508
Restricted equity securities, Carrying Amount	7,691	5,349
Servicing rights, net, Carrying Amount	3,415	3,053
Accrued interest receivable	6,108	3,545
Deposits, Carrying Amount	1,714,594	1,172,233
Federal funds purchased and repurchase agreements, Carrying Amount	37,618	39,078
Federal Home Loan Bank advances, Carrying Amount	57,000	19,000
Accrued interest payable	$ 587	$ 421

Securities Sold under Agreeme63

Securities Sold under Agreement to Repurchase - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Disclosure of Repurchase Agreements [Abstract]
Total short-term borrowings	$ 37,618	$ 22,253
Securities sold under agreements to repurchase, maturity period	1 day

Securities Sold under Agreeme64

Securities Sold under Agreement to Repurchase - Additional Details of Securities Sold under Agreement to Repurchase (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Market value of securities pledged	$ 43,052
Borrowings related to pledged amounts	$ 37,618
Market value pledged as a % of borrowings	114.00%
U.S. Government Sponsored Entities and Agencies [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Market value of securities pledged	$ 6,039
Borrowings related to pledged amounts	$ 4,734
Market value pledged as a % of borrowings	128.00%
Mortgage-Backed Securities: Residential [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Market value of securities pledged	$ 33,542
Borrowings related to pledged amounts	$ 29,623
Market value pledged as a % of borrowings	113.00%
Mortgage-Backed Securities: Commercial [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Market value of securities pledged	$ 3,471
Borrowings related to pledged amounts	$ 3,261
Market value pledged as a % of borrowings	106.00%

Earnings Per Share - Computatio

Earnings Per Share - Computation of Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic
Net income available to common shareholders	$ 5,125	$ 1,990	$ 11,341	$ 5,504
Less: earnings allocated to participating securities	(52)	(27)	(127)	(57)
Net income allocated to common shareholders	$ 5,073	$ 1,963	$ 11,214	$ 5,447
Weighted average common shares outstanding including participating securities	10,516,290	7,737,710	9,668,497	5,840,620
Less: Participating securities	(107,502)	(105,129)	(108,617)	(60,840)
Average shares	10,408,788	7,632,581	9,559,880	5,779,780
Basic earnings per common share	$ 0.49	$ 0.26	$ 1.17	$ 0.94
Diluted
Net income allocated to common shareholders	$ 5,073	$ 1,963	$ 11,214	$ 5,447
Weighted average common shares outstanding for basic earnings per common share	10,408,788	7,632,581	9,559,880	5,779,780
Add: Dilutive effects of assumed exercises of stock options	534,148	272,634	466,955	170,470
Add: Dilutive effects of assumed exercises of stock warrants	13,265	7,559	13,257	5,033
Average shares and dilutive potential common shares	10,956,201	7,912,774	10,040,092	5,955,283
Dilutive earnings per common share	$ 0.46	$ 0.25	$ 1.12	$ 0.91

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Stock options to purchase shares of the Company's common stock	226,040	228,691	274,132

Capital Offering - Additional I

Capital Offering - Additional Information (Detail)	Mar. 26, 2015$ / sharesshares
Equity [Abstract]
Offering price per share in private placement | $ / shares	$ 21
Common shares issued	2,640,000

Capital Offering - Schedule of

Capital Offering - Schedule of Net Proceeds (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Proceeds from Issuance or Sale of Equity [Abstract]
Gross proceeds	$ 55,440
Less: Stock offering costs	(5,017)
Net proceeds from issuance of common stock	$ 50,423	$ (514)