Franklin Financial Network (FSB) 10-Q 14 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 10, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'FRFN	'
Entity Registrant Name	'FRANKLIN FINANCIAL NETWORK INC.	'
Entity Central Index Key	'0001407067	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	7,739,644

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from financial institutions	$36,657	$18,217
Certificates of deposit at other financial institutions	250	0
Securities available for sale	346,750	268,515
Securities held to maturity (fair value 2014-$55,904 and 2013-$54,004)	56,293	56,575
Loans held for sale, at fair value	25,652	10,694
Loans	719,275	421,304
Allowance for loan losses	-5,883	-4,900
Net loans	713,392	416,404
Restricted equity securities, at cost	5,349	3,032
Premises and equipment, net	13,113	4,138
Accrued interest receivable	3,426	2,396
Bank owned life insurance	11,579	8,232
Deferred tax asset	8,028	3,995
Foreclosed assets	1,690	181
Servicing rights, net	2,956	2,640
Mortgage banking derivative asset	368	464
Goodwill	9,121	157
Core deposit intangible, net	2,876	0
Other assets	1,079	734
Total assets	1,238,579	796,374
Deposits	'	'
Non-interest bearing	136,830	52,686
Interest bearing	914,728	628,614
Total deposits	1,051,558	681,300
Federal funds purchased and repurchase agreements	34,238	24,291
Federal Home Loan Bank advances	33,000	23,000
Accrued interest payable	437	222
Mortgage banking derivative liability	54	0
Other liabilities	2,838	2,398
Total liabilities	1,122,125	731,211
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, 2014 and December 31, 2013, respectively	10,000	10,000
Common stock, no par value; 10,000,000 shares authorized; 7,739,644 and 4,862,875 issued at September 30, 2014 and December 31 2013, respectively	93,888	52,638
Retained earnings	12,562	7,058
Accumulated other comprehensive income (loss)	4	-4,533
Total shareholders' equity	116,454	65,163
Total liabilities and shareholders' equity	$1,238,579	$796,374

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Held-to-maturity securities, fair value	$55,904	$54,004
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	10,000,000	10,000,000
Common stock shares issued	7,739,644	4,862,875

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income and dividends	'	'	'	'
Loans, including fees	$10,168	$5,186	$22,466	$14,434
Securities:	'	'	'	'
Taxable	2,395	1,098	6,932	2,979
Tax-Exempt	20	17	60	46
Dividends on restricted equity securities	84	30	175	57
Federal funds sold and other	25	7	57	35
Total interest income and dividends	12,692	6,338	29,690	17,551
Interest expense	'	'	'	'
Deposits	1,446	874	3,808	2,733
Federal funds purchased and repurchase agreements	39	50	123	94
Federal Home Loan Bank advances	80	29	189	67
Total Interest Expense	1,565	953	4,120	2,894
Net interest income	11,127	5,385	25,570	14,657
Provision for loan losses	664	225	1,489	457
Net interest income after provision for loan losses	10,463	5,160	24,081	14,200
Noninterest income	'	'	'	'
Service charges on deposit accounts	13	12	37	39
Other service charges and fees	600	270	1,149	868
Net gains on sale of loans	1,875	714	4,226	3,611
Loan servicing fees, net	73	-19	173	-317
Gain on sale of securities	22	'	93	78
Net gain (loss) on sale and write-down of foreclosed assets	-3	-29	28	-250
Other	694	369	1,419	1,153
Total noninterest income	3,274	1,317	7,125	5,182
Noninterest expense	'	'	'	'
Salaries and employee benefits	6,144	3,339	13,494	9,830
Occupancy and equipment	1,443	666	3,238	1,990
FDIC assessment expense	181	101	420	254
Marketing	224	70	470	193
Professional fees	961	79	1,594	322
Other	1,436	587	2,743	1,690
Total noninterest expense	10,389	4,842	21,959	14,279
Income before income tax expense	3,348	1,635	9,247	5,103
Income tax expense	1,333	625	3,668	1,945
Net income	2,015	1,010	5,579	3,158
Dividends paid on Series A preferred stock	-25	-25	-75	-83
Net income available to common shareholders	$1,990	$985	$5,504	$3,075
Earnings per share:	'	'	'	'
Basic	$0.26	$0.27	$0.94	$0.84
Diluted	$0.25	$0.26	$0.91	$0.82

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$2,015	$1,010	$5,579	$3,158
Unrealized gains/losses on securities:	'	'	'	'
Unrealized holding gain (loss) arising during the period	-623	819	7,445	-4,138
Reclassification adjustment for gains included in net income	-22	'	-93	-78
Net unrealized gains (losses)	-645	819	7,352	-4,216
Tax effect	247	-313	-2,815	1,614
Total other comprehensive income (loss)	-398	506	4,537	-2,602
Comprehensive income	$1,617	$1,516	$10,116	$556

Condensed_Consolidated_Stateme2

Condensed Consolidated Statement of Changes In Shareholders' Equity (Unaudited) (USD $)	Total	Series A Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
					Series A Preferred Stock [Member]
Beginning balance at Dec. 31, 2012	$51,356,000	$10,000,000	$37,821,000	$2,606,000	'	$929,000
Exercise of common stock warrants, 2,775 shares	33,000	'	33,000	'	'	'
Exercise of common stock options	58,000	'	58,000	'	'	'
Issuance of 958,924 shares of common stock, net of stock offering costs of $601	11,865	'	11,865	'	'	'
Dividends paid on Series A preferred stock	-83,000	'	'	'	-83,000	'
Stock based compensation expense	261,000	'	261,000	'	'	'
Stock issued in conjunction with 401(k) employer match	229,000	'	229,000	'	'	'
Stock issued in conjunction with stock option exchange	-142,000	'	-142,000	'	'	'
Net income	3,158,000	'	'	3,158,000	'	'
Other comprehensive income (loss)	-2,602,000	'	'	'	'	-2,602,000
Ending balance at Sep. 30, 2013	64,133,000	10,000,000	50,125,000	5,681,000	'	-1,673,000
Beginning balance at Dec. 31, 2013	65,163,000	10,000,000	52,638,000	7,058,000	'	-4,533,000
Exercise of common stock options	56,000	'	56,000	'	'	'
Dividends paid on Series A preferred stock	-75,000	'	'	'	-75,000	'
Stock based compensation expense	457,000	'	457,000	'	'	'
Stock issued in conjunction with 401(k) employer match	275,000	'	275,000	'	'	'
Stock (2,766,191 shares) and stock options (137,280 options) issued related to MidSouth Bank acquisition, net of stock issuance costs of $514	40,462,000	'	40,462,000	'	'	'
Net income	5,579,000	'	'	5,579,000	'	'
Other comprehensive income (loss)	4,537,000	'	'	'	'	4,537,000
Ending balance at Sep. 30, 2014	$116,454,000	$10,000,000	$93,888,000	$12,562,000	'	$4,000

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Changes In Shareholders' Equity (Unaudited) (Parenthetical) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Exercise of common stock warrants, number of shares	'	2,775
Exercise of common stock options, number of shares	6,508	5,755
Stock issued in conjunction with 401(k) employer match, number of shares	20,345	17,596
Stock issued in conjunction with stock option exchange, number of shares	'	32,814
MidSouth Bank [Member]	'	'
Common stock, shares	2,766,191	'
Exercise of common stock options, number of shares	137,280,000	'
Proceeds from issuance of common stock, net of offering costs	514	'
Common Stock [Member]	'	'
Proceeds from issuance of common stock, net of offering costs	'	601
Issuance of common stock	'	958,924
Common Stock [Member] | MidSouth Bank [Member]	'	'
Common stock, shares	2,766,191	'
Exercise of common stock options, number of shares	137,280,000	'
Proceeds from issuance of common stock, net of offering costs	514	'

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities	'	'
Net income	$5,579	$3,158
Adjustments to reconcile net income to net cash from operating activities	'	'
Depreciation and amortization on premises and equipment	616	492
Accretion of purchase accounting adjustments	-831	0
Net amortization of securities	1,928	3,497
Amortization of loan servicing right asset	547	991
Amortization of core deposit intangible	184	0
Increase (decrease) in impairment of servicing asset	0	-90
Provision for loan losses	1,489	457
Origination of loans held for sale	-191,142	-244,491
Proceeds from sale of loans held for sale	186,618	253,939
Net gain on sale of loans	-4,226	-3,611
Gain on sale of available for sale securities	-93	-78
Income from bank owned life insurance	-203	-204
(Gain) loss on sale and write down of foreclosed assets	-28	250
Stock-based compensation	457	261
Compensation expense related to common stock issued to 401(k) plan	275	229
Net change in:	'	'
Accrued interest receivable and other assets	101	-688
Accrued interest payable and other liabilities	-719	891
Net cash from operating activities	552	15,003
Available for sale securities:	'	'
Sales	34,087	11,555
Purchases	-118,611	-88,211
Maturities, prepayments and calls	69,465	67,289
Held to maturity securities:	'	'
Purchases	-8,601	-19,656
Maturities, prepayments and calls	8,655	4,095
Net change in loans	-114,676	-79,196
Purchase of restricted equity securities	-745	-664
Proceeds from sale of foreclosed assets	634	1,870
Purchases of premises and equipment, net	-2,941	-978
Decrease in interest bearing deposits in financial institutions	0	100
Net cash acquired from acquisition (See Note 2)	12,197	0
Net cash from investing activities	-120,536	-103,796
Cash flows from financing activities	'	'
Increase in deposits	125,903	9,031
(Decrease) increase in federal funds purchased and repurchase agreements	9,054	37,995
Proceeds from Federal Home Loan Bank advances	4,000	21,449
Proceeds from exercise of common stock warrants	0	30
Proceeds from exercise of common stock options	56	58
Cash paid in conjunction with stock option exchange	0	-142
Proceeds from issuance of common stock, net of offering costs	-514	11,868
Dividends paid on preferred stock	-75	-83
Net cash from financing activities	138,424	80,206
Net change in cash and cash equivalents	18,440	-8,587
Cash and cash equivalents at beginning of period	18,217	24,977
Cash and cash equivalents at end of period	36,657	16,390
Supplemental information:	'	'
Interest paid	3,905	2,951
Income taxes paid	4,546	1,944
Non-cash supplemental information:	'	'
Fair value of stock and stock options issued related to MidSouth Bank acquisition (See Note 2)	40,976	0
Transfers from loans to foreclosed assets	1,315	761
Transfer from additional paid-in-capital to common stock	$0	$426

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Accounting Policies [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 Banc Compliance Group, Inc. (collectively, 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 prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended (the “Securities Act”), on May 15, 2014.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2014
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. The Company recognized goodwill on this acquisition of $8,964, after consideration of a measurement period adjustment discussed below, which is nondeductible for tax purposes as this acquisition was a nontaxable transaction. The goodwill is calculated based on the fair values of the assets acquired and liabilities assumed as of the acquisition date. Fair value estimates are based on the information available, and are subject to change for up to one year after the closing date of the acquisition as additional information relative to closing date fair values becomes available. Fair values are preliminary estimates due to pending appraisals on loans and other real estate owned.
	The Company acquired 100% of the outstanding preferred and common stock of MidSouth. The purchase price consisted of both cash and stock. MidSouth’s common shareholders received 0.425926 shares of FFN common stock for each share of MidSouth common stock. MidSouth’s preferred shareholders received 0.851852 shares of FFN common stock for each share of MidSouth preferred stock. Each MidSouth Series 2009A warrant holder received 0.18 shares of FFN common stock for each MidSouth Series 2009A warrant, and each Series 2011-A warrant holder received 0.146667 shares of FFN common stock for each MidSouth Series 2011-A warrant. In lieu of issuing fractional shares of FFN common stock, FFN paid former MidSouth shareholders an amount in cash determined by multiplying (i) $13.50 by (ii) the fraction of a share (rounded to the nearest ten thousandth when expressed in decimal form) of FFN common stock.
	MidSouth common stock options were converted into options to purchase shares of FFN common stock based on the 0.425926 exchange ratio, with the new exercise price becoming the exercise price of the MidSouth options divided by the exchange ratio. On the date of the merger, 2,766,191 shares of FFN common stock were exchanged for the common and preferred stock, and common stock warrants of MidSouth in accordance with the proration and allocation procedures contained in the merger agreement and as noted above. Subsequently, cash totaling $100 was paid to dissenting MidSouth shareholders representing 7,427 shares of FFN common stock. In addition, $18 of cash was paid to MidSouth shareholders for fractional shares in accordance with the merger agreement.
	Based on a valuation of the FFN’s common stock as of July 1, 2014, the resulting purchase price was $41,094. The following table summarizes the purchase price calculation:
	Number of shares of MidSouth common stock outstanding at July 1, 2014		3,912,503
	Common stock per share exchange ratio		0.425926
	Total FFN common shares issued, net of 1,048.5142 fractional shares					1,662,641
	Number of shares of MidSouth preferred stock outstanding at July 1, 2014		1,259,907
	Common stock per share exchange ratio		0.851852
	Total FFN common shares issued, net of 203.1097 fractional shares					1,068,366
	Number of MidSouth Series 2009A preferred warrants outstanding at July 1, 2014		242,350
	Common stock per share exchange ratio		0.18
	Total FFN common shares issued, net of 50.3800 fractional shares					34,157
	Number of MidSouth Series 2011-A preferred warrants outstanding at July 1, 2014		7,141
	Common stock per share exchange ratio		0.146667
	Total FFN common shares issued, net of 20.3482 fractional shares					1,027
	Total FFN common shares issued, net of 1,322.3521 fractional shares and 2,747.2227 MidSouth dissenting converted common shares							2,766,191
	Multiplied by FFN common stock value per share at July 1, 2014						$	14.5
	Total Stock Consideration—Fair value of FFN common stock issued						$	40,110
	FFN stock options granted to MidSouth option holders					137,280
	Grant date fair value per share of FFN options at July 1, 2014				$	6.31
	Fair value of FFN stock options granted to MidSouth option holders						$	866
	Total MidSouth dissenting common shares		6,450
	Common stock per share exchange ratio		0.425926
	Total converted MidSouth dissenting common shares, including 5.2227 fractional shares					2,747.22
	Total MidSouth dissenting preferred shares		5,500
	Preferred stock per share exchange ratio		0.851852
	Total converted MidSouth dissenting preferred shares, including 0.1860 fractional shares					4,685.19
	Total converted MidSouth dissenting shares					7,432.41
	Multiplied by the cash consideration each MidSouth share was entitled to receive				$	13.5
	Cash consideration paid to dissenting shareholders						$	100
	Total fractional shares resulting from acquisition of MidSouth					1,322.35
	Multiplied by the cash consideration each MidSouth share was entitled to receive				$	13.5
	Cash consideration paid for fractional shares						$	18
	Total Cash Consideration						$	118
	Total Purchase Price						$	41,094
	The table below summarizes the preliminary estimates of the fair value of the assets purchased, including goodwill, and liabilities assumed as of the July 1, 2014 purchase date.
	In Thousands	Fair Value
		Recorded
		by FFN
	Assets
	Cash and due from banks	$	1,369
	Interest-bearing accounts at other financial institutions		10,946
	Securities, available-for-sale		57,431
	Loans held for sale		7,071
	Loans		184,345
	Certificates of deposit at other financial institutions		250
	Restricted equity securities		1,572
	Bank premises and equipment, net		6,650
	Bank-owned life insurance		3,144
	Accrued interest receivable		728
	Foreclosed assets		800
	Core deposit intangible		3,060
	Deferred tax asset		6,753
	Other assets		747
	Total assets acquired	$	284,866
	Liabilities
	Deposits	$	(244,415	)
	Short-term borrowings		(6,893	)
	Other liabilities		(1,428	)
Total liabilities assumed	$	(252,736	)
Net assets acquired		32,130
Total consideration paid		41,094
Goodwill	$	8,964
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 June 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
The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance at acquisition date.
	Unpaid			Fair
	Principal			Value
	Balance
Loans:
Residential real estate	$	39,425		$	38,618
Commercial real estate		82,465			80,566
Construction and land development		43,766			42,454
Commercial loans		16,311			15,352
Consumer and other loans		1,865			1,828
Purchased credit-impaired		7,860			5,527
Total earning assets	$	191,692		$	184,345
In its assumption of the deposit liabilities, the Company believed the deposits assumed from the acquisition have 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 will be amortized utilizing an accelerated amortization method over an estimated economic life of 8.2 years. When determining the valuation amount, deposits were analyzed based on factors such as type of deposit, deposit retention, interest rates and age of deposit relationships.
Pro-forma information
Pro-forma data for the three and nine month periods ending September 30, 2013 listed in the table below presents pro-forma information as if the MidSouth acquisition occurred at the beginning of 2013. 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 period ending September 30, 2014, there is no pro-forma information for the three months ending September 30, 2014.
	Three months			Nine months
	ended Sept 30,			ended Sept 30,
	2013			2014		2013
Net interest income	$	8,019		$	30,014	$	22,547
Net income available to common shareholders		1,411			5,790		4,115
Earnings per share—basic	$	0.23		$	0.61	$	0.71
Earnings per share—diluted	$	0.23		$	0.6	$	0.69
Supplemental pro forma earnings for 2014 were adjusted to exclude $2,084 of acquisition-related costs incurred in 2014 and $665 of discount accretion and $124 of premium amortization related to the fair value adjustments to acquisition-date assets and liabilities. Supplemental pro forma earnings for 2013 were adjusted to include these items, as appropriate.
During the three and nine months ending September 30, 2014 the acquisition of MidSouth increased net interest income by approximately $2,994 and net income available to common shareholders by approximately $853.

Securities

Securities	9 Months Ended
	Sep. 30, 2014
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, 2014 and December 31, 2013 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income.
			Amortized			Gross			Gross			Fair
			Cost			Unrealized			Unrealized			Value
						Gains			Losses
	September 30, 2014
	U.S. government sponsored entities and agencies		$	20,130		$	232		$	(550	)	$	19,812
	U.S. Treasury securities			7,000			—			—			7,000
	Mortgage-backed securities: residential			307,633			3,029			(2,776	)		307,886
	Mortgage-backed securities: commercial			6,490			26			(49	)		6,467
	State and political subdivisions			5,490			95			—			5,585
	Total		$	346,743		$	3,382		$	(3,375	)	$	346,750
			Amortized			Gross			Gross			Fair
			Cost			Unrealized			Unrealized			Value
						Gains			Losses
	December 31, 2013
	U.S. government sponsored entities and agencies		$	16,029		$	—		$	(1,305	)	$	14,724
	Mortgage-backed securities: residential			259,831			1,560			(7,600	)		253,791
	Total		$	275,860		$	1,560		$	(8,905	)	$	268,515
	The amortized cost and fair value of the held to maturity securities portfolio at September 30, 2014 and December 31, 2013 and the corresponding amounts of gross unrecognized gains and losses were as follows:
			Amortized			Gross			Gross			Fair
			Cost			Unrecognized			Unrecognized			Value
						Gains			Losses
	September 30, 2014
	U.S. government sponsored entities and agencies		$	6,546		$	119		$	(167	)	$	6,498
	Mortgage backed securities: residential			40,524			417			(940	)		40,001
	State and political subdivisions			9,223			275			(93	)		9,405
	Total		$	56,293		$	811		$	(1,200	)	$	55,904
			Gross			Gross			Gross			Fair
			Amortized			Unrecognized			Unrecognized			Value
			Cost			Gains			Losses
	December 31, 2013
	U.S. government sponsored entities and agencies		$	8,225		$	12		$	(484	)	$	7,753
	Mortgage backed securities: residential			39,043			293			(2,061	)		37,275
	State and political subdivisions			9,307			89			(420	)		8,976
	Total		$	56,575		$	394		$	(2,965	)	$	54,004
	Sales of available for sale securities were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Proceeds		$	9,767		$	—		$	34,087		$	11,555
	Gross gains			31			—			256			141
	Gross losses			(9	)		—			(163	)		(63	)
	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, 2014
			Amortized			Fair
			Cost			Value
	Available for sale
	Three months or less		$	7,000		$	7,000
	Over three months through one year			—			—
	Over one year through five years			259			263
	Over five years through ten years			13,030			13,147
	Over ten years			12,331			11,987
	Mortgage-backed securities: commercial			6,490			6,467
	Mortgage-backed securities: residential			307,633			307,886
	Total		$	346,743		$	346,750
	Held to maturity
	Over three months through one year		$	251		$	252
	Over one year through five years			1,422			1,478
	Over five years through ten years			1,106			1,116
	Over ten years			12,990			13,057
	Mortgage-backed securities: residential			40,524			40,001
	Total		$	56,293		$	55,904
Securities pledged at September 30, 2014 and December 31, 2013 had a carrying amount of $347,748 and $194,925 and were pledged to secure public deposits and repurchase agreements.
At September 30, 2014 and December 31, 2013, 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, 2014 and December 31, 2013, 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
		Value			Losses			Value			Losses			Value		Losses
September 30, 2014
Available for sale
U.S. government sponsored entities and agencies		$	1,048		$	(4	)	$	8,063		$	(546	)	$	9,111	$	(550	)
Mortgage-backed securities: commercial			5,611			(49	)		—			—			5,611		(49	)
Mortgage-backed securities: residential			82,851			(870	)		52,533			(1,906	)		135,384		(2,776	)
Total available for sale		$	89,510		$	(923	)	$	60,596		$	(2,452	)	$	150,106	$	(3,375	)
		Less Than 12 Months						12 Months or Longer						Total
		Fair			Unrecognized			Fair			Unrecognized			Fair		Unrecognized
		Value			Losses			Value			Losses			Value		Losses
Held to maturity
U.S. government sponsored entities and agencies		$	—		$	—		$	2,833		$	(167	)	$	2,833	$	(167	)
Mortgage-backed securities: residential			14,556			(449	)		11,189			(491	)		25,745		(940	)
State and political subdivisions			509			—	(1)		3,950			(93	)		4,459		(93	)
Total held to maturity		$	15,065		$	(449	)	$	17,972		$	(751	)	$	33,037	$	(1,200	)
-1	Unrecognized loss for this category was less than $1 when rounded.
		Less Than 12 Months						12 Months or Longer						Total
		Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
		Value			Losses			Value			Losses			Value		Losses
December 31, 2013
Available for sale
U.S. government sponsored entities and agencies		$	12,983		$	(1,128	)	$	1,741		$	(177	)	$	14,724	$	(1,305	)
Mortgage-backed securities: residential			168,817			(6,762	)		11,721			(838	)		180,538		(7,600	)
Total available for sale		$	181,800		$	(7,890	)	$	13,462		$	(1,015	)	$	195,262	$	(8,905	)
		Less Than 12 Months						12 Months or Longer						Total
		Fair			Unrecognized			Fair			Unrecognized			Fair		Unrecognized
		Value			Losses			Value			Losses			Value		Losses
Held to maturity
U.S. government sponsored entities and agencies		$	6,168		$	(332	)	$	848		$	(152	)	$	7,016	$	(484	)
Mortgage-backed securities: residential			19,952			(1,752	)		4,042			(309	)		23,994		(2,061	)
State and political subdivisions			5,762			(342	)		422			(78	)		6,184		(420	)
Total held to maturity		$	31,882		$	(2,426	)	$	5,312		$	(539	)	$	37,194	$	(2,965	)
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, 2014
Receivables [Abstract]	'
Loans	'
	NOTE 4—LOANS
	Loans at September 30, 2014 and December 31, 2013 were as follows:
		September 30,			December 31,
		2014			2013
	Loans that are not PCI loans
	Construction and land development	$	213,975		$	113,710
	Commercial real estate:
	Nonfarm, nonresidential		218,149			114,852
	Other		5,671			10,350
	Residential real estate:
	Closed-end 1-4 family		128,693			98,615
	Other		72,737			39,851
	Commercial and industrial		68,693			36,397
	Consumer and other		7,442			8,250
	Loans before net deferred loan fees		715,360			422,025
	Deferred loan fees, net		(873	)		(721	)
	Total loans that are not PCI loans		714,487			421,304
	PCI loans
	Construction and land development	$	78		$	—
	Commercial real estate:
	Nonfarm, nonresidential		1,830			—
	Other		532			—
	Residential real estate:
	Closed-end 1-4 family		842			—
	Other		152			—
	Commercial and industrial		1,352			—
	Consumer and other		2			—
	Total PCI loans		4,788			—
	Allowance for loan losses		(5,883	)		(4,900	)
	Total loans, net of allowance for loan losses	$	713,392		$	416,404
	The following table presents the activity in the allowance for loan losses by portfolio segment for the three month periods ending September 30, 2014 and 2013:
		Construction			Commercial			Residential			Commercial			Consumer			Total
		and Land			Real			Real			and			and
		Development			Estate			Estate			Industrial			Other
	Three Months Ending September 30, 2014
	Allowance for loan losses:
	Beginning balance	$	1,910		$	1,740		$	1,560		$	508		$	53		$	5,771
	Provision 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 no allowance for loan losses for PCI loans for the three months ended September 30, 2014 or for the three months ended September 30, 2013.
	The adequacy of the allowance for loan losses is assessed at the end of each calendar quarter. The level of the allowance is based upon evaluation of the loan portfolio, current asset quality trends, known and inherent risks in the portfolio, adverse situations that may affect the borrowers’ ability to repay (including the timing of future payment), the estimated value of any underlying collateral, composition of the loan portfolio, economic conditions, historical loss experience, industry and peer bank loan quality indications and other pertinent factors. The impact of the three months ended activity based allowance disclosures was not material to the Company’s results of operations during the three months ended September 30, 2013.
	The following table presents the activity in the allowance for loan losses by portfolio segment for the nine month periods ending September 30, 2014 and 2013:
		Construction			Commercial			Residential			Commercial			Consumer			Total
		and Land			Real			Real			and			and
		Development			Estate			Estate			Industrial			Other
	Nine Months Ending September 30, 2014
	Allowance for loan losses:
	Beginning balance	$	1,552		$	1,511		$	1,402		$	337		$	98		$	4,900
	Provision 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
	Nine Months Ending September 30, 2013
	Allowance for loan losses:
	Beginning balance	$	1,342		$	1,267		$	893		$	275		$	206		$	3,983
	Provision for loan losses		243			20			119			131			(56	)		457
	Loans charged-off		—			—			(107	)		—			—			(107	)
	Recoveries		—			—			99			—			—			99
	Total ending allowance balance	$	1,585		$	1,287		$	1,004		$	406		$	150		$	4,432
	There was no allowance for loan losses for PCI loans for the nine months ended September 30, 2014 or for the nine months ended September 30, 2013.
	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, 2014 and December 31, 2013. For purposes of this disclosure, recorded investment in loans excludes accrued interest receivable and loan fees, net due to immateriality.
	Construction			Commercial			Residential			Commercial			Consumer			Total
	and Land			Real			Real			and			and
	Development			Estate			Estate			Industrial			Other
September 30, 2014
Allowance for loan losses:
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	—		$	—		$	—		$	39		$	—		$	39
Collectively evaluated for impairment		2,141			1,373			1,744			537			49			5,844
Purchased credit-impaired loans		—			—			—			—			—			—
Total ending allowance balance	$	2,141		$	1,373		$	1,744		$	576		$	49		$	5,883
Loans:
Individually evaluated for impairment	$	—		$	835		$	—		$	59		$	—		$	894
Collectively evaluated for impairment		213,975			222,985			201,430			68,634			7,442			714,466
Purchased credit-impaired loans		78			2,362			994			1,352			2			4,788
Total ending loans balance	$	214,053		$	226,182		$	202,424		$	70,045		$	7,444		$	720,148
	Construction			Commercial			Residential			Commercial			Consumer			Total
	and Land			Real			Real			and			and
	Development			Estate			Estate			Industrial			Other
December 31, 2013
Allowance for loan losses:
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	—		$	455		$	93		$	—		$	—		$	548
Collectively evaluated for impairment		1,552			1,056			1,309			337			98			4,352
Purchased credit-impaired loans		—			—			—			—			—			—
Total ending allowance balance	$	1,552		$	1,511		$	1,402		$	337		$	98		$	4,900
Loans:
Individually evaluated for impairment	$	—		$	3,361		$	1,262		$	—		$	—		$	4,623
Collectively evaluated for impairment		113,710			121,841			137,204			36,397			8,250			417,402
Purchased credit-impaired loans		—			—			—			—			—			—
Total ending loans balance	$	113,710		$	125,202		$	138,466		$	36,397		$	8,250		$	422,025
Loans collectively evaluated for impairment reported at September 30, 2014 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. Management evaluated these loans for credit deterioration since acquisition and determined that no allowance for loan losses was necessary at September 30, 2014.
The following table presents information related to impaired loans by class of loans as of September 30, 2014 and December 31, 2013:
	Unpaid			Recorded			Allowance for
	Principal			Investment			Loan Losses
	Balance						Allocated
September 30, 2014
With no allowance recorded:
Commercial real estate:
Nonfarm, nonresidential	$	2,422		$	835		$	—
With an allowance recorded:
Commercial real estate:
Nonfarm, nonresidential		—			—			—
Commercial and industrial		59			59			39
Subtotal		59			59			39
Total	$	2,481		$	894		$	39
December 31, 2013
With no allowance recorded:
Commercial real estate:
Nonfarm, nonresidential	$	1,986		$	1,986		$	—
Residential real estate:
1-4 family		36			36			—
Subtotal		2,022			2,022			—
With an allowance recorded:
Commercial real estate:
Nonfarm, nonresidential	$	2,480		$	1,375		$	455
Residential real estate:
1-4 family		1,687			1,226			93
Subtotal		4,167			2,601			548
Total	$	6,189		$	4,623		$	548
The following table presents the average recorded investment of impaired loans by class of loans for the three and nine months ended September 30, 2014 and 2013:
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
Average Recorded Investment	2014			2013			2014			2013
With no allowance recorded:
Construction and land development	$	—		$	—		$	—		$	—
Commercial real estate:
Nonfarm, nonresidential		211			—			71			—
Residential real estate:
1-4 family		—			36			—			36
Subtotal		211			36			71			36
With an allowance recorded:
Construction and land development		—		$	74			—			73
Commercial real estate:
Nonfarm, nonresidential		1,194			1,375			837			1,375
Residential real estate:
1-4 family		—			1,226			476			1,226
Commercial and industrial		64			—			65			20
Subtotal		1,258			2,675			1,378			2,694
Total	$	1,469		$	2,711		$	1,449		$	2,730
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, 2014 and 2013.
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, 2014 and December 31, 2013:
	Nonaccrual			Loans Past Due
				Over 90 Days
September 30, 2014
Commercial real estate:
Nonfarm, nonresidential	$	1,628		$	—
Other		532			—
Residential real estate:
Closed-end1-4 family		337			411
Other		42			—
Construction and land development		78			—
Commercial and industrial		287			41
Total	$	2,904		$	452
December 31, 2013
Commercial real estate:
Nonfarm, nonresidential	$	1,375		$	—
Residential real estate:
1-4 family		1,226			—
Total	$	2,601		$	—
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, 2014 and December 31, 2013 by class of loans:
	30-59			60-89			Greater			Total			Loans Not			Total
	Days			Days			Than			Past Due			Past Due
	Past Due			Past Due			89 Days
							Past Due
September 30, 2014
Construction and land development	$	—		$	—		$	78		$	78		$	213,897		$	213,975
Commercial real estate:
Nonfarm, nonresidential		—			—			1,628			1,628			216,521			218,149
Other		—			—			532			532			5,139			5,671
Residential real estate:
Closed-end 1-4 family		861			—			748			1,609			127,084			128,693
Other		—			—			42			42			72,695			72,737
Commercial and industrial		—			32			328			360			68,333			68,693
Consumer and other		1			—			—			1			7,441			7,442
	$	862		$	32		$	3,356		$	4,250		$	711,110		$	715,360
							Greater
	30-59			60-89			Than			Total			Loans			Total
	Days			Days			89 Days			Past Due			Not
	Past Due			Past Due			Past Due						Past Due
December 31, 2013
Construction and land development	$	—		$	—		$	—		$	—		$	113,710		$	113,710
Commercial real estate:
Nonfarm, nonresidential		1,985			—			1,375			3,360			111,492			114,852
Other		—			—			—			—			10,350			10,350
Residential real estate:
Closed end 1-4 family		245			—			1,226			1,471			97,144			98,615
Other		—			—			—			—			39,851			39,851
Commercial and industrial		—			—			—			—			36,397			36,397
Consumer and other		—			—			—			—			8,250			8,250
	$	2,230		$	—		$	2,601		$	4,831		$	417,194		$	422,025
Credit Quality Indicators: The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans as well as non-homogeneous residential real estate loans. This analysis is performed on a quarterly basis. The Company uses the following definitions for risk ratings:
Special Mention. Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.
Substandard. Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.
Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass rated loans. Based on the most recent analysis performed, the risk category of loans by class of loans is as follows as of September 30, 2014 and December 31, 2013:
	Pass			Special			Substandard			Total
				Mention
September 30, 2014
Construction and land development	$	213,772		$	125		$	78		$	213,975
Commercial real estate:
Nonfarm, nonresidential		214,202			726			3,221			218,149
Other		5,142			—			529			5,671
Residential real estate:
Closed-end 1-4 family		125,676			355			2,662			128,693
Other		72,502			87			148			72,737
Commercial and industrial		66,462			886			1,345			68,693
Consumer and other		7,442			—			—			7,442
	$	705,198		$	2,179		$	7,983		$	715,360
	Pass			Special			Substandard			Total
				Mention
December 31, 2013
Construction and land development	$	113,710		$	—		$	—		$	113,710
Commercial real estate:
Nonfarm, nonresidential		110,938			—			3,914			114,852
Other		10,350			—			—			10,350
Residential real estate:
1-4 family		96,823			—			1,792			98,615
Other		39,851			—			—			39,851
Commercial and industrial		36,397			—			—			36,397
Consumer and other		8,250			—			—			8,250
	$	416,319		$	—		$	5,706		$	422,025
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, 2014. Contractually required principal and interest payments have been adjusted for estimated prepayments.
	September 30,
	2014
Contractually required principal and interest	$	7,535
Non-accretable difference		(1,629	)
Cash flows expected to be collected		5,906
Accretable yield		(1,118	)
Carrying value of acquired loans		4,788
Allowance for loan losses		—
Carrying value less allowance for loan losses	$	4,788
For the three and nine months ended September 30, 2014, the Company recognized $120 in accretion income from the accretable yield related to acquired PCI loans.
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, 2014
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, 2014 and December 31, 2013 are as follows:
		September 30,			December 31,
		2014			2013
	Loan portfolios serviced for:
	Federal Home Loan Mortgage Corporation	$	398,161		$	348,121
	Other		4,473			5,088
	The components of net loan servicing fees for the three and nine months ended September 30, 2014 and 2013 were as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Loan servicing fees, net:
	Loan servicing fees	$	253		$	217		$	720		$	584
	Amortization of loan servicing fees		(180	)		(326	)		(547	)		(991	)
	Decrease in impairment		—			90			—			90
	Total	$	73		$	(19	)	$	173		$	(317	)
	The fair value of servicing rights was estimated by management to be approximately $4,104 at September 30, 2014. Fair value for 2014 was determined using a weighted average discount rate of 10.5% and a weighted average prepayment speed of 10.1%. At December 31, 2013, the fair value of servicing rights was estimated by management to be approximately $3,714. Fair value for 2013 was determined using weighted average discount rate of 10.5% and a weighted average prepayment speed of 8.8%.
	The weighted average amortization period is 6.66 years. Estimated amortization expense for each of the next three years is:
	2014	$	444
	2015		444
	2016		444

ShareBased_Payments

Share-Based Payments	9 Months Ended
	Sep. 30, 2014
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 2,500 warrants exercised during the nine months ended September 30, 2013, for which the Company received cash proceeds of $30. The exercised warrants had an intrinsic value of $3 at the date of exercise. No warrants have been exercised during 2014. At September 30, 2014, there were 31,877 outstanding warrants associated with the 2010 offering.
	In the event the common stock of the Company is to be registered under the Securities Act or is 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 thereafter 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: The Company’s 2007 Stock Option Plan (“stock option plan” or the “Plan”), which was shareholder-approved, permitted the grant of share options to its employees, organizers and directors for up to 551,250 shares of common stock. The Plan was amended during April 2010 to increase the number of shares available for issuance to 1,000,000. In April 2013, the Plan was amended to offer additional forms of equity compensation, to change the Plan’s name to the Franklin Financial Network, Inc. 2007 Omnibus Equity Incentive Plan, and to increase the number of authorized shares to 1,500,000. The Company believes that such awards better align the interests of its employees with those of its shareholders. In June 2014, shareholders approved to amend the Plan to increase the number of authorized shares to 2,000,000. At September 30, 2014, there were 604,551 authorized shares available for issuance.
	Employee, organizer and director awards are generally 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.
	During 2007, the Company granted 33,750 options to its organizers under the Plan. These options were granted in accordance with each organizer’s financial contribution to the Company during its organization period, and will vest over a five year period. No service element was included in the criteria used for determining grant awards. Accordingly, these options are not being expensed as stock-based compensation.
	During 2013, the Company granted employees the option to acquire common shares of the Company, plus a cash award, in exchange for existing vested options held by the employee. Options that were exchanged were surrendered and considered cancelled. As part of this exchange, a total of 166,448 options were cancelled in exchange for 32,814 shares of common stock and cash awards totaling $142.
	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.
	On the date of the merger, 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.
	The fair value of options granted was determined using the following weighted-average assumptions as of grant date.
		September 30,			September 30,
		2014			2013
	Risk-free interest rate		1.81	%		1.65	%
	Expected term		5.9 years			7.5 years
	Expected stock price volatility		10.85	%		12.63	%
	Dividend yield		0.23	%		0.99	%
	The weighted average fair value of options granted for the nine months ended September 30, 2014 and 2013 were $4.12 and $1.92, respectively.
	A summary of the activity in the stock option plans for the nine months ended September 30, 2014 follows:
		Shares			Weighted			Weighted		Aggregate
					Average			Average		Intrinsic
					Exercise			Remaining		Value
					Price			Contractual
								Term
	Outstanding at beginning of year		946,644		$	11.27			6.81	$	1,635
	Granted		316,960			11.36
	Exercised		(6,508	)		8.63
	Forfeited, expired, or cancelled		(19,134	)		11.71
	Outstanding at period end		1,237,962		$	11.3			6.93	$	2,076
	Vested or expected to vest		1,176,064		$	11.3			6.93	$	1,972
	Exercisable at period end		807,599		$	10.61			6.1	$	1,630
	As of September 30, 2014, there was $740 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: Additionally, the Company’s 2007 Omnibus Equity Incentive Plan provides for the granting of restricted share awards and other performance related incentives. During 2014, the Company awarded 87,374 restricted common shares to employees of the Company. When the restricted shares are awarded, a participant receives voting and dividend rights with respect to the shares, but is not able to transfer the shares until the restrictions have lapsed. These awards have a vesting period of three to five years and vest in equal annual installments on the anniversary date of the grant.
	A summary of activity for non-vested restricted share awards for the nine months ended September 30, 2014 is as follows:
	Non-vested Shares	Shares			Weighted-Average
					Grant-Date
					Fair Value
	Non-vested at December 31, 2013		28,685		$	13
	Granted		87,374			14.12
	Vested		(9,166	)		13
	Forfeited		(3,649	)		14.32
	Non-vested at September 30, 2014		103,244		$	13.91
	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, 2014, there was $931 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 4.02 years.

Regulatory_Capital_Matters

Regulatory Capital Matters	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Regulatory Capital Matters	'
	NOTE 7—REGULATORY CAPITAL MATTERS
	Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. Management believes as of September 30, 2014, the Company and Bank meet all capital adequacy requirements to which they are subject.
	Prompt corrective action regulations provide five classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. At September 30, 2014, the most recent regulatory notifications categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the institution’s category. Actual and required capital amounts and ratios are presented below as of September 30, 2014 and December 31, 2013 for the Company and Bank.
		Actual					Required					To Be Well
							For Capital					Capitalized Under
							Adequacy Purposes					Prompt Corrective
												Action Regulations
		Amount		Ratio			Amount		Ratio			Amount		Ratio
	September 30, 2014
	Company Total Capital to risk weighted assets	$	110,328		13.05	%	$	67,643		8	%		N/A		N/A
	Company Tier 1 (Core) Capital to risk weighted assets	$	104,445		12.35	%	$	33,821		4	%		N/A		N/A
	Company Tier 1 (Core) Capital to average assets	$	104,445		8.83	%	$	47,319		4	%		N/A		N/A
	Bank Total Capital to risk weighted assets	$	109,810		12.99	%	$	67,629		8	%	$	84,537		10	%
	Bank Tier 1 (Core) Capital to risk weighted assets	$	103,927		12.29	%	$	33,815		4	%	$	50,722		6	%
	Bank Tier 1 (Core) Capital to average assets	$	103,927		8.79	%	$	47,311		4	%	$	59,139		5	%
	December 31, 2013
	Company Total Capital to risk weighted assets	$	74,430		14.81	%	$	40,209		8	%		N/A		N/A
	Company Tier 1 (Core) Capital to risk weighted assets	$	69,530		13.83	%	$	20,105		4	%		N/A		N/A
	Company Tier 1 (Core) Capital to average assets	$	69,530		9.78	%	$	28,449		4	%		N/A		N/A
	Bank Total Capital to risk weighted assets	$	73,305		14.59	%	$	40,192		8	%	$	50,239		10	%
	Bank Tier 1 (Core) Capital to risk weighted assets	$	68,405		13.62	%	$	20,096		4	%	$	30,144		6	%
	Tier 1 (Core) Capital to average assets	$	68,405		9.62	%	$	28,455		4	%	$	35,569		5	%
	Dividend Restrictions: The Company’s principal source of funds for dividend payments is dividends received from the Bank. Banking regulations limit the amount of dividends that may be paid without prior approval of regulatory agencies. Under these regulations, the amount of dividends that may be paid in any calendar year is limited to the current year’s net profits, combined with the retained net profits of the preceding two years, subject to the capital requirements described above. During 2014 the Bank could declare, without prior approval, dividends of approximately $9,190 plus any 2014 net profits retained to the date of declaration.

Fair_Value

Fair Value	9 Months Ended
	Sep. 30, 2014
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: The fair values for investment securities are determined by quoted market prices, if available (Level 1). For securities where quoted prices are not available, fair values are calculated based on market prices of similar securities (Level 2). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows or other market indicators (Level 3).
	Derivatives: The fair values of derivatives are based on valuation models using observable market data as of the measurement date (Level 2).
	Impaired Loans: The fair value of impaired loans with specific allocations of the allowance for loan losses is generally based on recent real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. Non-real estate collateral may be valued using an appraisal, net book value per the borrower’s financial statements, or aging reports, adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Appraisals for impaired loans are generally obtained annually but may be obtained more frequently based on changing circumstances as part of the aforementioned quarterly evaluation.
	Foreclosed Assets: Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. Fair value is commonly based on recent real estate appraisals which are updated no less frequently than annually. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. Foreclosed assets are evaluated on a quarterly basis for additional impairment and adjusted accordingly.
	Loans Held For Sale: During 2014 the Company elected the fair value option for loans held for sale to align with other accounting policies related to mortgage banking, such as mortgage banking derivatives. These loans are typically sold to an investor following loan origination and the fair value of such accounts are readily available based on direct quotes from investors or similar transactions experienced in the secondary loan market. Fair value adjustments, as well as realized gains and losses are recorded in current earnings. Fair value is determined by market prices for similar transactions adjusted for specific attributes of that loan.
	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
		September 30, 2014 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Financial Assets
	Securities available for sale
	U.S. government sponsored entities and agencies	$	1,739	$	18,073	$	—
	U.S. Treasury Bills		7,000		—		—
	Mortgage-backed securities-residential		—		307,886		—
	Mortgage-backed securities-commercial		—		6,467		—
	State and political subdivisions		—		5,585		—
	Total securities available for sale	$	8,739	$	338,011	$	—
	Loans held for sale	$	—	$	25,652	$	—
	Mortgage banking derivatives	$	—	$	368	$	—
	Financial Liabilities
	Mortgage banking derivatives	$	—	$	54	$	—
		Fair Value Measurements at
		December 31, 2013 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Financial Assets
	Securities available for sale
	U.S. government sponsored entities and agencies	$	—	$	14,724	$	—
	Mortgage-backed securities-residential		—		253,791		—
	Total securities available for sale	$	—	$	268,515	$	—
	Mortgage banking derivatives	$	—	$	464	$	—
	As of September 30, 2014, the unpaid principal balance of loans held for sale was $24,897 resulting in an unrealized gain of $755 included in gains on sale of loans. For the three and nine months ended September 30, 2014, the change in fair value related to loans held for sale, which is included in gain on sale of loans, has increased $217 and $755, respectively. None of these loans are 90 days or more past due or on nonaccrual as of September 30, 2014. There were no loans held for sale carried at fair value as of December 31, 2013.
	There were no transfers between level 1 and 2 during 2014 and 2013.
	Assets measured at fair value on a non-recurring basis are summarized below:
		Fair Value Measurements at
		September 30, 2014 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Impaired loans with specific allocations
	Commercial and industrial		—		—		20
	Foreclosed assets
	Construction and land development		—		—		800
		Fair Value Measurements at
		December 31, 2013 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
Identical Assets		Inputs		(Level 3)
(Level 1)		(Level 2)
Impaired loans with specific allocations
Real estate:
Residential	$	—	$	—	$	1,133
Commercial		—		—		920
Impaired loans with specific allocations, which are measured for impairment using the fair value of the collateral for collateral dependent loans, had a carrying amount of $59, with a valuation allowance of $39 at September 30, 2014, resulting in provision for loan losses totaling ($7) and $39 for the three and nine month periods ending September 30, 2014. At December 31, 2013, impaired loans with specific allocations had a carrying amount of $2,601, with a valuation allowance of $548. For the three and nine months ended September 30, 2013, no 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 $1,690 and $181 as of September 30, 2014 and December 31, 2013, respectively. There were no properties at September 30, 2014 that had required write-downs to fair value resulting in no write downs for the three and nine month periods ending September 30, 2014. Foreclosed assets measured at fair value less costs to sell were written down to fair value resulting in a write-down of $190 for the nine month period ending September 30, 3013. There were no write downs to fair value for the three month period ending September 30, 2013.
The following table presents quantitative information about recurring Level 3 fair value measurements at September 30, 2014:
	Fair		Valuation		Unobservable		Range
	Value		Technique(s)		Input(s)		(Weighted
							Average)
Foreclosed assets
Construction and land development	$	800		Sales comparison	Adjustment for			0%-40%(40%)
					differences between
					comparable sales
The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2013:
	Fair		Valuation		Unobservable		Range
	Value		Technique(s)		Input(s)		(Weighted
							Average)
Impaired loans:
Residential real estate	$	1,133		Sales comparison	Adjustment for			3%-27%(16%)
					differences between
					comparable sales
Commercial real estate	$	920		Sales comparison	Adjustment for			0%-16%(16%)
					differences between
					comparable sales
The carrying amounts and estimated fair values of financial instruments, at September 30, 2014 and December 31, 2013 are as follows:
			Fair Value Measurements at
	Carrying		September 30, 2014 Using:
	Amount		Level 1		Level 2				Level 3		Total
Financial assets
Cash and cash equivalents	$	36,657	$	36,657	$	—			$	—	$	36,657
Securities available for sale		346,750		8,739		338,011				—		346,750
Certificates of deposit held at other financial institutions		250		—		250				—		250
Securities held to maturity		56,293		—		55,904				—		55,904
Loans held for sale		25,652		—		25,652				—		25,652
Net loans		713,392		—		—				709,009		709,009
Restricted equity securities		5,349		n/a		n/a				n/a		n/a
Servicing rights, net		2,956		—		4,104				—		4,104
Accrued interest receivable		3,426		13		1,400				2,013		3,426
Financial liabilities
Deposits	$	1,051,558	$	719,293	$	334,629			$	—	$	1,053,922
Federal funds purchased and repurchase agreements		34,238		—		34,238				—		34,238
Federal Home Loan Bank advances		33,000		—		33,181				—		33,181
Accrued interest payable		437		35		402				—		437
	Carrying		Fair Value Measurements at
	Amount		December 31, 2013 Using:
			Level 1		Level 2				Level 3		Total
Financial assets
Cash and cash equivalents	$	18,217	$	18,217	$	—			$	—	$	18,217
Securities available for sale		268,515		—		268,515				—		268,515
Securities held to maturity		56,575		—		54,004				—		54,004
Loans held for sale		10,694		—		10,694				—		10,694
Net loans		416,404		—		—				415,515		415,515
Restricted equity securities		3,032		n/a		n/a				n/a		n/a
Mortgage servicing rights		2,640		—		3,714				—		3,714
Accrued interest receivable		2,396		—		1,145				1,251		2,396
Financial liabilities
Deposits	$	681,300	$	480,000	$	202,300			$	—	$	682,300
Federal funds purchased and repurchase agreements		24,291		—		24,291				—		24,291
Federal Home Loan Bank advances		23,000		—		23,023				—		23,023
Accrued interest payable		222		17		205				—		222
The methods and assumptions not previously described used to estimate fair value are described as follows:
(a) Cash and Cash Equivalents: The carrying amounts of cash and short-term instruments approximate fair values and are classified as Level 1.
(b) Loans: Fair values of loans, excluding loans held for sale, are estimated as follows: For variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values resulting in a Level 3 classification. Fair values for other loans are estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality resulting in a Level 3 classification. Impaired loans are valued at the lower of cost or fair value as described previously. The methods utilized to estimate the fair value of loans do not necessarily represent an exit price.
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: It is not practical to determine the fair value of Federal Home Loan Bank or Federal Reserve Bank stock due to restrictions placed on its transferability.
(d) Mortgage Servicing Rights: Fair value of mortgage servicing rights is based on valuation models that calculate the present value of estimated net cash flows based on industry market data. The valuation model incorporates assumptions that market participants would use in estimating future net cash flows resulting in a Level 2 classification.
(e) Deposits: The fair values disclosed for demand deposits (e.g., interest and non-interest checking, passbook savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amount) resulting in a Level 1 classification. The carrying amounts of fixed-term money market accounts approximate their fair values at the reporting date resulting in a Level 1 classification. Fair values for certificates of deposit are estimated using a discounted cash flows calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on time deposits resulting in a Level 2 classification.
(f) Federal Funds Purchased and Repurchase Agreements: The carrying amounts of federal funds purchased, borrowings under repurchase agreements, and other short-term borrowings, generally maturing within ninety days, approximate their fair values resulting in a Level 2 classification.
(g) Federal Home Loan Bank Advances: The fair values of the Company’s long-term borrowings are estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements resulting in a Level 2 classification.
(h) Accrued Interest Receivable/Payable: The carrying amounts of accrued interest approximate fair value resulting in a Level 1 or Level 2 classification based on the asset/liability that they are associated with.
(i) Off-balance Sheet Instruments: Fair values for off-balance sheet, credit-related financial instruments are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The fair value of commitments is not material.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	NOTE 9—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						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Basic
	Net income available to common shareholders	$	1,990		$	985		$	5,504		$	3,075
	Less: earnings allocated to participating securities		(27	)		(8	)		(57	)		(11	)
	Net income allocated to common shareholders	$	1,963		$	977		$	5,447		$	3,064
	Weighted average common shares outstanding including participating securities		7,737,710			3,704,437			5,840,620			3,655,722
	Less: Participating securities		(105,129	)		(30,105	)		(60,840	)		(13,564	)
	Average shares		7,632,581			3,674,332			5,779,780			3,642,158
	Basic earnings per common share	$	0.26		$	0.27		$	0.94		$	0.84
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Diluted
	Net income allocated to common shareholders	$	1,963		$	977		$	5,447		$	3,064
	Weighted average common shares outstanding for basic earnings per common share		7,632,581			3,674,332			5,840,620			3,642,158
	Add: Dilutive effects of assumed exercises of stock options		272,634			85,987			170,470			105,052
	Add: Dilutive effects of assumed exercises of stock warrants		7,559			2,485			5,033			2,490
	Average shares and dilutive potential common shares		7,912,774			3,762,804			6,016,123			3,749,700
	Dilutive earnings per common share	$	0.25		$	0.26		$	0.91		$	0.82
	For the three months ended September 30, 2013, stock options for 57,952 shares of common stock were not considered in computing diluted earnings per common share because they were antidilutive. Stock options for 274,132 and 57,952 shares of common stock were not considered in computing diluted earnings per common share for the nine months ended September 30, 2014 and 2013 because they were antidilutive.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Summary of Purchase Price Calculation	'
	The following table summarizes the purchase price calculation:
	Number of shares of MidSouth common stock outstanding at July 1, 2014		3,912,503
	Common stock per share exchange ratio		0.425926
	Total FFN common shares issued, net of 1,048.5142 fractional shares					1,662,641
	Number of shares of MidSouth preferred stock outstanding at July 1, 2014		1,259,907
	Common stock per share exchange ratio		0.851852
	Total FFN common shares issued, net of 203.1097 fractional shares					1,068,366
	Number of MidSouth Series 2009A preferred warrants outstanding at July 1, 2014		242,350
	Common stock per share exchange ratio		0.18
	Total FFN common shares issued, net of 50.3800 fractional shares					34,157
	Number of MidSouth Series 2011-A preferred warrants outstanding at July 1, 2014		7,141
	Common stock per share exchange ratio		0.146667
	Total FFN common shares issued, net of 20.3482 fractional shares					1,027
	Total FFN common shares issued, net of 1,322.3521 fractional shares and 2,747.2227 MidSouth dissenting converted common shares							2,766,191
	Multiplied by FFN common stock value per share at July 1, 2014						$	14.5
	Total Stock Consideration—Fair value of FFN common stock issued						$	40,110
	FFN stock options granted to MidSouth option holders					137,280
	Grant date fair value per share of FFN options at July 1, 2014				$	6.31
	Fair value of FFN stock options granted to MidSouth option holders						$	866
	Total MidSouth dissenting common shares		6,450
	Common stock per share exchange ratio		0.425926
	Total converted MidSouth dissenting common shares, including 5.2227 fractional shares					2,747.22
	Total MidSouth dissenting preferred shares		5,500
	Preferred stock per share exchange ratio		0.851852
	Total converted MidSouth dissenting preferred shares, including 0.1860 fractional shares					4,685.19
	Total converted MidSouth dissenting shares					7,432.41
	Multiplied by the cash consideration each MidSouth share was entitled to receive				$	13.5
	Cash consideration paid to dissenting shareholders						$	100
	Total fractional shares resulting from acquisition of MidSouth					1,322.35
	Multiplied by the cash consideration each MidSouth share was entitled to receive				$	13.5
	Cash consideration paid for fractional shares						$	18
	Total Cash Consideration						$	118
	Total Purchase Price						$	41,094
Summary of Preliminary Estimates of Fair Value of the Assets Purchased , Including Goodwill, and Liabilities Assumed	'
	The table below summarizes the preliminary estimates of the fair value of the assets purchased, including goodwill, and liabilities assumed as of the July 1, 2014 purchase date.
	In Thousands	Fair Value
		Recorded
		by FFN
	Assets
	Cash and due from banks	$	1,369
	Interest-bearing accounts at other financial institutions		10,946
	Securities, available-for-sale		57,431
	Loans held for sale		7,071
	Loans		184,345
	Certificates of deposit at other financial institutions		250
	Restricted equity securities		1,572
	Bank premises and equipment, net		6,650
	Bank-owned life insurance		3,144
	Accrued interest receivable		728
	Foreclosed assets		800
	Core deposit intangible		3,060
	Deferred tax asset		6,753
	Other assets		747
	Total assets acquired	$	284,866
	Liabilities
	Deposits	$	(244,415	)
	Short-term borrowings		(6,893	)
	Other liabilities		(1,428	)
	Total liabilities assumed	$	(252,736	)
	Net assets acquired		32,130
	Total consideration paid		41,094
	Goodwill	$	8,964
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
Summary of Fair Value of Acquired Loans and Unpaid Principal Balance	'
	The table below presents information with respect to the fair value of acquired loans, as well as their unpaid principal balance at acquisition date.
		Unpaid			Fair
		Principal			Value
		Balance
	Loans:
	Residential real estate	$	39,425		$	38,618
	Commercial real estate		82,465			80,566
	Construction and land development		43,766			42,454
	Commercial loans		16,311			15,352
	Consumer and other loans		1,865			1,828
	Purchased credit-impaired		7,860			5,527
	Total earning assets	$	191,692		$	184,345
Pro-Forma Financial Information and Actual Results of Acquisition	'
	Pro-forma data for the three and nine month periods ending September 30, 2013 listed in the table below presents pro-forma information as if the MidSouth acquisition occurred at the beginning of 2013. 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 period ending September 30, 2014, there is no pro-forma information for the three months ending September 30, 2014.
		Three months			Nine months
		ended Sept 30,			ended Sept 30,
		2013			2014		2013
	Net interest income	$	8,019		$	30,014	$	22,547
	Net income available to common shareholders		1,411			5,790		4,115
	Earnings per share—basic	$	0.23		$	0.61	$	0.71
	Earnings per share—diluted	$	0.23		$	0.6	$	0.69

Securities_Tables

Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
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, 2014 and December 31, 2013 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income.
			Amortized			Gross			Gross			Fair
			Cost			Unrealized			Unrealized			Value
						Gains			Losses
	September 30, 2014
	U.S. government sponsored entities and agencies		$	20,130		$	232		$	(550	)	$	19,812
	U.S. Treasury securities			7,000			—			—			7,000
	Mortgage-backed securities: residential			307,633			3,029			(2,776	)		307,886
	Mortgage-backed securities: commercial			6,490			26			(49	)		6,467
	State and political subdivisions			5,490			95			—			5,585
	Total		$	346,743		$	3,382		$	(3,375	)	$	346,750
			Amortized			Gross			Gross			Fair
			Cost			Unrealized			Unrealized			Value
						Gains			Losses
	December 31, 2013
	U.S. government sponsored entities and agencies		$	16,029		$	—		$	(1,305	)	$	14,724
	Mortgage-backed securities: residential			259,831			1,560			(7,600	)		253,791
	Total		$	275,860		$	1,560		$	(8,905	)	$	268,515
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, 2014 and December 31, 2013 and the corresponding amounts of gross unrecognized gains and losses were as follows:
			Amortized			Gross			Gross			Fair
			Cost			Unrecognized			Unrecognized			Value
						Gains			Losses
	September 30, 2014
	U.S. government sponsored entities and agencies		$	6,546		$	119		$	(167	)	$	6,498
	Mortgage backed securities: residential			40,524			417			(940	)		40,001
	State and political subdivisions			9,223			275			(93	)		9,405
	Total		$	56,293		$	811		$	(1,200	)	$	55,904
			Gross			Gross			Gross			Fair
			Amortized			Unrecognized			Unrecognized			Value
			Cost			Gains			Losses
	December 31, 2013
	U.S. government sponsored entities and agencies		$	8,225		$	12		$	(484	)	$	7,753
	Mortgage backed securities: residential			39,043			293			(2,061	)		37,275
	State and political subdivisions			9,307			89			(420	)		8,976
	Total		$	56,575		$	394		$	(2,965	)	$	54,004
Summary of Sales of Available for Sale Securities	'
	Sales of available for sale securities were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Proceeds		$	9,767		$	—		$	34,087		$	11,555
	Gross gains			31			—			256			141
	Gross losses			(9	)		—			(163	)		(63	)
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, 2014
			Amortized			Fair
			Cost			Value
	Available for sale
	Three months or less		$	7,000		$	7,000
	Over three months through one year			—			—
	Over one year through five years			259			263
	Over five years through ten years			13,030			13,147
	Over ten years			12,331			11,987
	Mortgage-backed securities: commercial			6,490			6,467
	Mortgage-backed securities: residential			307,633			307,886
	Total		$	346,743		$	346,750
	Held to maturity
	Over three months through one year		$	251		$	252
	Over one year through five years			1,422			1,478
	Over five years through ten years			1,106			1,116
	Over ten years			12,990			13,057
	Mortgage-backed securities: residential			40,524			40,001
	Total		$	56,293		$	55,904
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, 2014 and December 31, 2013 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
			Value			Losses			Value			Losses			Value		Losses
	September 30, 2014
	Available for sale
	U.S. government sponsored entities and agencies		$	1,048		$	(4	)	$	8,063		$	(546	)	$	9,111	$	(550	)
	Mortgage-backed securities: commercial			5,611			(49	)		—			—			5,611		(49	)
	Mortgage-backed securities: residential			82,851			(870	)		52,533			(1,906	)		135,384		(2,776	)
	Total available for sale		$	89,510		$	(923	)	$	60,596		$	(2,452	)	$	150,106	$	(3,375	)
			Less Than 12 Months						12 Months or Longer						Total
			Fair			Unrecognized			Fair			Unrecognized			Fair		Unrecognized
			Value			Losses			Value			Losses			Value		Losses
	Held to maturity
	U.S. government sponsored entities and agencies		$	—		$	—		$	2,833		$	(167	)	$	2,833	$	(167	)
	Mortgage-backed securities: residential			14,556			(449	)		11,189			(491	)		25,745		(940	)
	State and political subdivisions			509			—	(1)		3,950			(93	)		4,459		(93	)
	Total held to maturity		$	15,065		$	(449	)	$	17,972		$	(751	)	$	33,037	$	(1,200	)
	-1	Unrecognized loss for this category was less than $1 when rounded.
			Less Than 12 Months						12 Months or Longer						Total
			Fair			Unrealized			Fair			Unrealized			Fair		Unrealized
			Value			Losses			Value			Losses			Value		Losses
	December 31, 2013
	Available for sale
	U.S. government sponsored entities and agencies		$	12,983		$	(1,128	)	$	1,741		$	(177	)	$	14,724	$	(1,305	)
	Mortgage-backed securities: residential			168,817			(6,762	)		11,721			(838	)		180,538		(7,600	)
	Total available for sale		$	181,800		$	(7,890	)	$	13,462		$	(1,015	)	$	195,262	$	(8,905	)
			Less Than 12 Months						12 Months or Longer						Total
			Fair			Unrecognized			Fair			Unrecognized			Fair		Unrecognized
			Value			Losses			Value			Losses			Value		Losses
	Held to maturity
	U.S. government sponsored entities and agencies		$	6,168		$	(332	)	$	848		$	(152	)	$	7,016	$	(484	)
	Mortgage-backed securities: residential			19,952			(1,752	)		4,042			(309	)		23,994		(2,061	)
	State and political subdivisions			5,762			(342	)		422			(78	)		6,184		(420	)
	Total held to maturity		$	31,882		$	(2,426	)	$	5,312		$	(539	)	$	37,194	$	(2,965	)

Loans_Tables

Loans (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Summary of Loans	'
	Loans at September 30, 2014 and December 31, 2013 were as follows:
		September 30,			December 31,
		2014			2013
	Loans that are not PCI loans
	Construction and land development	$	213,975		$	113,710
	Commercial real estate:
	Nonfarm, nonresidential		218,149			114,852
	Other		5,671			10,350
	Residential real estate:
	Closed-end 1-4 family		128,693			98,615
	Other		72,737			39,851
	Commercial and industrial		68,693			36,397
	Consumer and other		7,442			8,250
	Loans before net deferred loan fees		715,360			422,025
	Deferred loan fees, net		(873	)		(721	)
	Total loans that are not PCI loans		714,487			421,304
	PCI loans
	Construction and land development	$	78		$	—
	Commercial real estate:
	Nonfarm, nonresidential		1,830			—
	Other		532			—
	Residential real estate:
	Closed-end 1-4 family		842			—
	Other		152			—
	Commercial and industrial		1,352			—
	Consumer and other		2			—
	Total PCI loans		4,788			—
	Allowance for loan losses		(5,883	)		(4,900	)
	Total loans, net of allowance for loan losses	$	713,392		$	416,404
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 ending September 30, 2014 and 2013:
		Construction			Commercial			Residential			Commercial			Consumer			Total
		and Land			Real			Real			and			and
		Development			Estate			Estate			Industrial			Other
	Three Months Ending September 30, 2014
	Allowance for loan losses:
	Beginning balance	$	1,910		$	1,740		$	1,560		$	508		$	53		$	5,771
	Provision 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
	The following table presents the activity in the allowance for loan losses by portfolio segment for the nine month periods ending September 30, 2014 and 2013:
		Construction			Commercial			Residential			Commercial			Consumer			Total
		and Land			Real			Real			and			and
		Development			Estate			Estate			Industrial			Other
	Nine Months Ending September 30, 2014
	Allowance for loan losses:
	Beginning balance	$	1,552		$	1,511		$	1,402		$	337		$	98		$	4,900
	Provision 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
	Nine Months Ending September 30, 2013
	Allowance for loan losses:
	Beginning balance	$	1,342		$	1,267		$	893		$	275		$	206		$	3,983
	Provision for loan losses		243			20			119			131			(56	)		457
	Loans charged-off		—			—			(107	)		—			—			(107	)
	Recoveries		—			—			99			—			—			99
	Total ending allowance balance	$	1,585		$	1,287		$	1,004		$	406		$	150		$	4,432
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, 2014 and December 31, 2013. For purposes of this disclosure, recorded investment in loans excludes accrued interest receivable and loan fees, net due to immateriality.
		Construction			Commercial			Residential			Commercial			Consumer			Total
		and Land			Real			Real			and			and
		Development			Estate			Estate			Industrial			Other
	September 30, 2014
	Allowance for loan losses:
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment	$	—		$	—		$	—		$	39		$	—		$	39
	Collectively evaluated for impairment		2,141			1,373			1,744			537			49			5,844
	Purchased credit-impaired loans		—			—			—			—			—			—
	Total ending allowance balance	$	2,141		$	1,373		$	1,744		$	576		$	49		$	5,883
	Loans:
	Individually evaluated for impairment	$	—		$	835		$	—		$	59		$	—		$	894
	Collectively evaluated for impairment		213,975			222,985			201,430			68,634			7,442			714,466
	Purchased credit-impaired loans		78			2,362			994			1,352			2			4,788
	Total ending loans balance	$	214,053		$	226,182		$	202,424		$	70,045		$	7,444		$	720,148
		Construction			Commercial			Residential			Commercial			Consumer			Total
		and Land			Real			Real			and			and
		Development			Estate			Estate			Industrial			Other
	December 31, 2013
	Allowance for loan losses:
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment	$	—		$	455		$	93		$	—		$	—		$	548
	Collectively evaluated for impairment		1,552			1,056			1,309			337			98			4,352
	Purchased credit-impaired loans		—			—			—			—			—			—
	Total ending allowance balance	$	1,552		$	1,511		$	1,402		$	337		$	98		$	4,900
	Loans:
	Individually evaluated for impairment	$	—		$	3,361		$	1,262		$	—		$	—		$	4,623
	Collectively evaluated for impairment		113,710			121,841			137,204			36,397			8,250			417,402
	Purchased credit-impaired loans		—			—			—			—			—			—
	Total ending loans balance	$	113,710		$	125,202		$	138,466		$	36,397		$	8,250		$	422,025
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, 2014 and December 31, 2013:
		Unpaid			Recorded			Allowance for
		Principal			Investment			Loan Losses
		Balance						Allocated
	September 30, 2014
	With no allowance recorded:
	Commercial real estate:
	Nonfarm, nonresidential	$	2,422		$	835		$	—
	With an allowance recorded:
	Commercial real estate:
	Nonfarm, nonresidential		—			—			—
	Commercial and industrial		59			59			39
	Subtotal		59			59			39
	Total	$	2,481		$	894		$	39
	December 31, 2013
	With no allowance recorded:
	Commercial real estate:
	Nonfarm, nonresidential	$	1,986		$	1,986		$	—
	Residential real estate:
	1-4 family		36			36			—
	Subtotal		2,022			2,022			—
	With an allowance recorded:
	Commercial real estate:
	Nonfarm, nonresidential	$	2,480		$	1,375		$	455
	Residential real estate:
	1-4 family		1,687			1,226			93
	Subtotal		4,167			2,601			548
	Total	$	6,189		$	4,623		$	548
	The following table presents the average recorded investment of impaired loans by class of loans for the three and nine months ended September 30, 2014 and 2013:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
	Average Recorded Investment	2014			2013			2014			2013
	With no allowance recorded:
	Construction and land development	$	—		$	—		$	—		$	—
	Commercial real estate:
	Nonfarm, nonresidential		211			—			71			—
	Residential real estate:
	1-4 family		—			36			—			36
	Subtotal		211			36			71			36
	With an allowance recorded:
	Construction and land development		—		$	74			—			73
	Commercial real estate:
	Nonfarm, nonresidential		1,194			1,375			837			1,375
	Residential real estate:
	1-4 family		—			1,226			476			1,226
	Commercial and industrial		64			—			65			20
	Subtotal		1,258			2,675			1,378			2,694
	Total	$	1,469		$	2,711		$	1,449		$	2,730
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, 2014 and December 31, 2013:
		Nonaccrual			Loans Past Due
					Over 90 Days
	September 30, 2014
	Commercial real estate:
	Nonfarm, nonresidential	$	1,628		$	—
	Other		532			—
	Residential real estate:
	Closed-end1-4 family		337			411
	Other		42			—
	Construction and land development		78			—
	Commercial and industrial		287			41
	Total	$	2,904		$	452
	December 31, 2013
	Commercial real estate:
	Nonfarm, nonresidential	$	1,375		$	—
	Residential real estate:
	1-4 family		1,226			—
	Total	$	2,601		$	—
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, 2014 and December 31, 2013 by class of loans:
		30-59			60-89			Greater			Total			Loans Not			Total
		Days			Days			Than			Past Due			Past Due
		Past Due			Past Due			89 Days
								Past Due
	September 30, 2014
	Construction and land development	$	—		$	—		$	78		$	78		$	213,897		$	213,975
	Commercial real estate:
	Nonfarm, nonresidential		—			—			1,628			1,628			216,521			218,149
	Other		—			—			532			532			5,139			5,671
	Residential real estate:
	Closed-end 1-4 family		861			—			748			1,609			127,084			128,693
	Other		—			—			42			42			72,695			72,737
	Commercial and industrial		—			32			328			360			68,333			68,693
	Consumer and other		1			—			—			1			7,441			7,442
		$	862		$	32		$	3,356		$	4,250		$	711,110		$	715,360
								Greater
		30-59			60-89			Than			Total			Loans			Total
		Days			Days			89 Days			Past Due			Not
		Past Due			Past Due			Past Due						Past Due
	December 31, 2013
	Construction and land development	$	—		$	—		$	—		$	—		$	113,710		$	113,710
	Commercial real estate:
	Nonfarm, nonresidential		1,985			—			1,375			3,360			111,492			114,852
	Other		—			—			—			—			10,350			10,350
	Residential real estate:
	Closed end 1-4 family		245			—			1,226			1,471			97,144			98,615
	Other		—			—			—			—			39,851			39,851
	Commercial and industrial		—			—			—			—			36,397			36,397
	Consumer and other		—			—			—			—			8,250			8,250
		$	2,230		$	—		$	2,601		$	4,831		$	417,194		$	422,025
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, 2014 and December 31, 2013:
		Pass			Special			Substandard			Total
					Mention
	September 30, 2014
	Construction and land development	$	213,772		$	125		$	78		$	213,975
	Commercial real estate:
	Nonfarm, nonresidential		214,202			726			3,221			218,149
	Other		5,142			—			529			5,671
	Residential real estate:
	Closed-end 1-4 family		125,676			355			2,662			128,693
	Other		72,502			87			148			72,737
	Commercial and industrial		66,462			886			1,345			68,693
	Consumer and other		7,442			—			—			7,442
		$	705,198		$	2,179		$	7,983		$	715,360
		Pass			Special			Substandard			Total
					Mention
	December 31, 2013
	Construction and land development	$	113,710		$	—		$	—		$	113,710
	Commercial real estate:
	Nonfarm, nonresidential		110,938			—			3,914			114,852
	Other		10,350			—			—			10,350
	Residential real estate:
	1-4 family		96,823			—			1,792			98,615
	Other		39,851			—			—			39,851
	Commercial and industrial		36,397			—			—			36,397
	Consumer and other		8,250			—			—			8,250
		$	416,319		$	—		$	5,706		$	422,025
Pro-Forma Financial Information and Actual Results of Acquisition	'
	Contractually required principal and interest payments have been adjusted for estimated prepayments.
		September 30,
		2014
	Contractually required principal and interest	$	7,535
	Non-accretable difference		(1,629	)
	Cash flows expected to be collected		5,906
	Accretable yield		(1,118	)
	Carrying value of acquired loans		4,788
	Allowance for loan losses		—
	Carrying value less allowance for loan losses	$	4,788

Loan_Servicing_Tables

Loan Servicing (Tables)	9 Months Ended
	Sep. 30, 2014
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, 2014 and December 31, 2013 are as follows:
		September 30,			December 31,
		2014			2013
	Loan portfolios serviced for:
	Federal Home Loan Mortgage Corporation	$	398,161		$	348,121
	Other		4,473			5,088
Components of Net Loan Servicing Fees	'
	The components of net loan servicing fees for the three and nine months ended September 30, 2014 and 2013 were as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Loan servicing fees, net:
	Loan servicing fees	$	253		$	217		$	720		$	584
	Amortization of loan servicing fees		(180	)		(326	)		(547	)		(991	)
	Decrease in impairment		—			90			—			90
	Total	$	73		$	(19	)	$	173		$	(317	)
Schedule of Estimated Amortization Expense	'
	The weighted average amortization period is 6.66 years. Estimated amortization expense for each of the next three years is:
	2014	$	444
	2015		444
	2016		444

ShareBased_Payments_Tables

Share-Based Payments (Tables)	9 Months Ended
	Sep. 30, 2014
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,
		2014			2013
	Risk-free interest rate		1.81	%		1.65	%
	Expected term		5.9 years			7.5 years
	Expected stock price volatility		10.85	%		12.63	%
	Dividend yield		0.23	%		0.99	%
Summary of Company's Stock Option Activities	'
	A summary of the activity in the stock option plans for the nine months ended September 30, 2014 follows:
		Shares			Weighted			Weighted		Aggregate
					Average			Average		Intrinsic
					Exercise			Remaining		Value
					Price			Contractual
								Term
	Outstanding at beginning of year		946,644		$	11.27			6.81	$	1,635
	Granted		316,960			11.36
	Exercised		(6,508	)		8.63
	Forfeited, expired, or cancelled		(19,134	)		11.71
	Outstanding at period end		1,237,962		$	11.3			6.93	$	2,076
	Vested or expected to vest		1,176,064		$	11.3			6.93	$	1,972
	Exercisable at period end		807,599		$	10.61			6.1	$	1,630
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, 2014 is as follows:
	Non-vested Shares	Shares			Weighted-Average
					Grant-Date
					Fair Value
	Non-vested at December 31, 2013		28,685		$	13
	Granted		87,374			14.12
	Vested		(9,166	)		13
	Forfeited		(3,649	)		14.32
	Non-vested at September 30, 2014		103,244		$	13.91

Regulatory_Capital_Matters_Tab

Regulatory Capital Matters (Tables)	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Actual and Required Capital Amounts and Ratios	'
	Actual and required capital amounts and ratios are presented below as of September 30, 2014 and December 31, 2013 for the Company and Bank.
		Actual					Required					To Be Well
							For Capital					Capitalized Under
							Adequacy Purposes					Prompt Corrective
												Action Regulations
		Amount		Ratio			Amount		Ratio			Amount		Ratio
	September 30, 2014
	Company Total Capital to risk weighted assets	$	110,328		13.05	%	$	67,643		8	%		N/A		N/A
	Company Tier 1 (Core) Capital to risk weighted assets	$	104,445		12.35	%	$	33,821		4	%		N/A		N/A
	Company Tier 1 (Core) Capital to average assets	$	104,445		8.83	%	$	47,319		4	%		N/A		N/A
	Bank Total Capital to risk weighted assets	$	109,810		12.99	%	$	67,629		8	%	$	84,537		10	%
	Bank Tier 1 (Core) Capital to risk weighted assets	$	103,927		12.29	%	$	33,815		4	%	$	50,722		6	%
	Bank Tier 1 (Core) Capital to average assets	$	103,927		8.79	%	$	47,311		4	%	$	59,139		5	%
	December 31, 2013
	Company Total Capital to risk weighted assets	$	74,430		14.81	%	$	40,209		8	%		N/A		N/A
	Company Tier 1 (Core) Capital to risk weighted assets	$	69,530		13.83	%	$	20,105		4	%		N/A		N/A
	Company Tier 1 (Core) Capital to average assets	$	69,530		9.78	%	$	28,449		4	%		N/A		N/A
	Bank Total Capital to risk weighted assets	$	73,305		14.59	%	$	40,192		8	%	$	50,239		10	%
	Bank Tier 1 (Core) Capital to risk weighted assets	$	68,405		13.62	%	$	20,096		4	%	$	30,144		6	%
	Tier 1 (Core) Capital to average assets	$	68,405		9.62	%	$	28,455		4	%	$	35,569		5	%

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2014
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
		September 30, 2014 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Financial Assets
	Securities available for sale
	U.S. government sponsored entities and agencies	$	1,739	$	18,073	$	—
	U.S. Treasury Bills		7,000		—		—
	Mortgage-backed securities-residential		—		307,886		—
	Mortgage-backed securities-commercial		—		6,467		—
	State and political subdivisions		—		5,585		—
	Total securities available for sale	$	8,739	$	338,011	$	—
	Loans held for sale	$	—	$	25,652	$	—
	Mortgage banking derivatives	$	—	$	368	$	—
	Financial Liabilities
	Mortgage banking derivatives	$	—	$	54	$	—
		Fair Value Measurements at
		December 31, 2013 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Financial Assets
	Securities available for sale
	U.S. government sponsored entities and agencies	$	—	$	14,724	$	—
	Mortgage-backed securities-residential		—		253,791		—
	Total securities available for sale	$	—	$	268,515	$	—
	Mortgage banking derivatives	$	—	$	464	$	—
Assets Measured at Fair Value on Non-Recurring Basis	'
	Assets measured at fair value on a non-recurring basis are summarized below:
		Fair Value Measurements at
		September 30, 2014 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Impaired loans with specific allocations
	Commercial and industrial		—		—		20
	Foreclosed assets
	Construction and land development		—		—		800
		Fair Value Measurements at
		December 31, 2013 Using:
		Quoted Prices		Significant		Significant
		in Active		Other		Unobservable
		Markets for		Observable		Inputs
		Identical Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
	Impaired loans with specific allocations
	Real estate:
	Residential	$	—	$	—	$	1,133
	Commercial		—		—		920
Quantitative Information about Recurring Level 3 Fair Value Measurements	'
	The following table presents quantitative information about recurring Level 3 fair value measurements at September 30, 2014:
		Fair		Valuation		Unobservable		Range
		Value		Technique(s)		Input(s)		(Weighted
								Average)
	Foreclosed assets
	Construction and land development	$	800		Sales comparison	Adjustment for			0%-40%(40%)
						differences between
						comparable sales
	The following table presents quantitative information about recurring Level 3 fair value measurements at December 31, 2013:
		Fair		Valuation		Unobservable		Range
		Value		Technique(s)		Input(s)		(Weighted
								Average)
	Impaired loans:
	Residential real estate	$	1,133		Sales comparison	Adjustment for			3%-27%(16%)
						differences between
						comparable sales
	Commercial real estate	$	920		Sales comparison	Adjustment for			0%-16%(16%)
						differences between
						comparable sales
Carrying Amount and Estimated Fair Value of Financial Instruments	'
	The carrying amounts and estimated fair values of financial instruments, at September 30, 2014 and December 31, 2013 are as follows:
				Fair Value Measurements at
		Carrying		September 30, 2014 Using:
		Amount		Level 1		Level 2				Level 3		Total
	Financial assets
	Cash and cash equivalents	$	36,657	$	36,657	$	—			$	—	$	36,657
	Securities available for sale		346,750		8,739		338,011				—		346,750
	Certificates of deposit held at other financial institutions		250		—		250				—		250
	Securities held to maturity		56,293		—		55,904				—		55,904
	Loans held for sale		25,652		—		25,652				—		25,652
	Net loans		713,392		—		—				709,009		709,009
	Restricted equity securities		5,349		n/a		n/a				n/a		n/a
	Servicing rights, net		2,956		—		4,104				—		4,104
	Accrued interest receivable		3,426		13		1,400				2,013		3,426
	Financial liabilities
	Deposits	$	1,051,558	$	719,293	$	334,629			$	—	$	1,053,922
	Federal funds purchased and repurchase agreements		34,238		—		34,238				—		34,238
	Federal Home Loan Bank advances		33,000		—		33,181				—		33,181
	Accrued interest payable		437		35		402				—		437
		Carrying		Fair Value Measurements at
		Amount		December 31, 2013 Using:
				Level 1		Level 2				Level 3		Total
	Financial assets
	Cash and cash equivalents	$	18,217	$	18,217	$	—			$	—	$	18,217
	Securities available for sale		268,515		—		268,515				—		268,515
	Securities held to maturity		56,575		—		54,004				—		54,004
	Loans held for sale		10,694		—		10,694				—		10,694
	Net loans		416,404		—		—				415,515		415,515
	Restricted equity securities		3,032		n/a		n/a				n/a		n/a
	Mortgage servicing rights		2,640		—		3,714				—		3,714
	Accrued interest receivable		2,396		—		1,145				1,251		2,396
	Financial liabilities
	Deposits	$	681,300	$	480,000	$	202,300			$	—	$	682,300
	Federal funds purchased and repurchase agreements		24,291		—		24,291				—		24,291
	Federal Home Loan Bank advances		23,000		—		23,023				—		23,023
	Accrued interest payable		222		17		205				—		222

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Earning per Share	'
	The factors used in the earnings per share computation follow:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Basic
	Net income available to common shareholders	$	1,990		$	985		$	5,504		$	3,075
	Less: earnings allocated to participating securities		(27	)		(8	)		(57	)		(11	)
	Net income allocated to common shareholders	$	1,963		$	977		$	5,447		$	3,064
	Weighted average common shares outstanding including participating securities		7,737,710			3,704,437			5,840,620			3,655,722
	Less: Participating securities		(105,129	)		(30,105	)		(60,840	)		(13,564	)
	Average shares		7,632,581			3,674,332			5,779,780			3,642,158
	Basic earnings per common share	$	0.26		$	0.27		$	0.94		$	0.84
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Diluted
	Net income allocated to common shareholders	$	1,963		$	977		$	5,447		$	3,064
	Weighted average common shares outstanding for basic earnings per common share		7,632,581			3,674,332			5,840,620			3,642,158
	Add: Dilutive effects of assumed exercises of stock options		272,634			85,987			170,470			105,052
	Add: Dilutive effects of assumed exercises of stock warrants		7,559			2,485			5,033			2,490
	Average shares and dilutive potential common shares		7,912,774			3,762,804			6,016,123			3,749,700
	Dilutive earnings per common share	$	0.25		$	0.26		$	0.91		$	0.82

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Dec. 31, 2013

Jul. 01, 2014

Jul. 01, 2014

Jun. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jul. 01, 2014

Jun. 30, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Sep. 30, 2014

Jul. 01, 2014

Dissenting Preferred Shares [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

Common Stock [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Dissenting Preferred Shares [Member]

Fractional Shares [Member]

Midsouth Series Two Thousand Nine A Warrant [Member]

Midsouth Series Two Thousand Nine A Warrant [Member]

Midsouth Series Two Thousand Eleven A Warrant [Member]

Midsouth Series Two Thousand Eleven A Warrant [Member]

Core Deposit [Member]

Core Deposit [Member]

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition completed date

'

'

'

'

'

'

1-Jul-14

'

'

'

'

'

'

'

'

'

'

'

'

'

Name of the acquired entity

'

'

'

'

'

'

'MidSouth Bank

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition agreement date

'

'

'

'

'

'

19-Nov-13

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

$9,121

$157

'

'

'

'

'

$8,964

'

'

'

'

'

'

'

'

'

'

'

'

Business acquisition, percentage of shares acquired

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

Shares received by acquiree

'

'

'

'

'

'

'

'

'

$0.43

'

$0.85

'

'

'

$0.18

'

$0.15

'

'

Lieu of fractional shares description

'

'

'

'

'

'

'In lieu of issuing fractional shares of FFN common stock, FFN paid former MidSouth shareholders an amount in cash determined by multiplying (i) $13.50 by (ii) the fraction of a share (rounded to the nearest ten thousandth when expressed in decimal form) of FFN common stock.

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock issued

'

'

7,427

2,766,191

'

'

'

'

'

'

1,068,366

'

'

'

34,157

'

1,027

'

'

'

Cash consideration paid

'

'

'

118

'

'

'

'

'

'

'

'

100

18

'

'

'

'

'

'

Total consideration paid

'

'

'

41,094

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans acquired at fair value

'

'

'

'

'

'

'

'

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%

'

'

'

'

'

'

'

'

'

'

'

Acquired loans with credit deficiencies

'

'

'

'

'

5,527

5,527

'

'

'

'

'

'

'

'

'

'

'

'

'

Core deposit intangible

'

'

'

'

'

'

'

3,060

'

'

'

'

'

'

'

'

'

'

'

3,060

Estimated economic life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'8 years 2 months 12 days

'

Increase in interest income

'

'

'

'

'

2,994

2,994

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in net income available to common shareholders

'

'

'

'

'

853

853

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition related costs

2,084

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount accretion

665

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Premium amortization related to the fair value adjustments

$124

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions_Summary_of_Purcha

Acquisitions - Summary of Purchase Price Calculation (Detail) (USD $)

9 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

Preferred Stock [Member]

Preferred Stock [Member]

Dissenting Common Shares [Member]

Dissenting Preferred Shares [Member]

Dissenting Preferred Shares [Member]

Dissenting Preferred Shares [Member]

Fractional Shares [Member]

Converted [Member]

Converted [Member]

Converted [Member]

Common Stock [Member]

Common Stock [Member]

Midsouth Series Two Thousand Nine A Warrant [Member]

Midsouth Series Two Thousand Nine A Warrant [Member]

Midsouth Series Two Thousand Eleven A Warrant [Member]

Midsouth Series Two Thousand Eleven A Warrant [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

Dissenting Common Shares [Member]

Dissenting Preferred Shares [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares of MidSouth common stock outstanding

'

'

'

'

3,912,503

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares of MidSouth preferred stock outstanding

'

'

'

'

'

'

'

'

'

'

1,259,907

'

'

'

'

'

'

'

'

Number of MidSouth Series preferred warrants outstanding

'

'

'

'

'

'

242,350

'

7,141

'

'

'

'

'

'

'

'

'

'

Total converted MidSouth dissenting common shares

'

'

2,747.22

'

'

'

'

'

'

'

'

6,450

'

'

'

'

7,432.41

2,747.22

'

Common stock per share exchange ratio

'

'

'

'

0.425926

'

0.18

'

0.146667

'

0.851852

0.425926

'

'

'

'

'

'

'

Total FFN common shares issued, net

'

2,766,191

'

1,662,641

'

34,157

'

1,027

'

1,068,366

'

'

7,427

'

'

'

'

'

'

Total Stock Consideration-Fair value of FFN common stock issued

'

$40,110

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

FFN stock options granted to MidSouth option holders

316,960

137,280

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Grant date fair value per share of FFN options at July 1, 2014

'

$6.31

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of FFN stock options granted to MidSouth option holders

'

866

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total converted MidSouth dissenting preferred shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,500

'

'

'

4,685.19

Preferred stock per share exchange ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.851852

'

'

'

'

Multiplied by FFN common stock value per share

'

'

$13.50

'

$14.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total fractional shares resulting from acquisition of MidSouth

'

'

1,322.35

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Multiplied by the cash consideration each MidSouth share was entitled to receive

'

'

$13.50

'

$14.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash consideration paid

'

118

'

'

'

'

'

'

'

'

'

'

'

100

'

18

'

'

'

Total Purchase Price

'

$41,094

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions_Summary_of_Purcha1

Acquisitions - Summary of Purchase Price Calculation (Parenthetical) (Detail) (MidSouth Bank [Member])	Jul. 01, 2014
Business Acquisition [Line Items]	'
Fractional shares	1,322.35
Dissenting converted common shares	2,747.22
Common Stock [Member]	'
Business Acquisition [Line Items]	'
Fractional shares	1,048.51
Midsouth Series Two Thousand Nine A Warrant [Member]	'
Business Acquisition [Line Items]	'
Fractional shares	50.38
Midsouth Series Two Thousand Eleven A Warrant [Member]	'
Business Acquisition [Line Items]	'
Fractional shares	20.3482
Preferred Stock [Member]	'
Business Acquisition [Line Items]	'
Fractional shares	203.1097
Dissenting Common Shares [Member]	'
Business Acquisition [Line Items]	'
Fractional shares	5.2227
Dissenting converted common shares	6,450
Dissenting Preferred Shares [Member]	'
Business Acquisition [Line Items]	'
Fractional shares	0.186

Acquisitions_Summary_of_Prelim

Acquisitions - Summary of Preliminary Estimates of Fair Value of the Assets Purchased , Including Goodwill, and Liabilities Assumed (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Jul. 01, 2014	Jul. 01, 2014
In Thousands, unless otherwise specified			MidSouth Bank [Member]	MidSouth Bank [Member]
Assets	'	'	'	'
Cash and due from banks	'	'	'	$1,369
Interest-bearing accounts at other financial institutions	'	'	'	10,946
Securities, available-for-sale	'	'	'	57,431
Loans held for sale	'	'	'	7,071
Loans	'	'	'	184,345
Certificates of deposit at other financial institutions	'	'	'	250
Restricted equity securities	'	'	'	1,572
Bank premises and equipment, net	'	'	'	6,650
Bank-owned life insurance	'	'	'	3,144
Accrued interest receivable	'	'	'	728
Foreclosed assets	'	'	'	800
Core deposit intangible	'	'	'	3,060
Deferred tax asset	'	'	'	6,753
Other assets	'	'	'	747
Total assets acquired	'	'	'	284,866
Liabilities	'	'	'	'
Deposits	'	'	'	-244,415
Short-term borrowings	'	'	'	-6,893
Other liabilities	'	'	'	-1,428
Total liabilities assumed	'	'	'	-252,736
Net assets acquired	'	'	'	32,130
Total consideration paid	'	'	41,094	'
Goodwill	$9,121	$157	'	$8,964

Acquisitions_Contractually_Req

Acquisitions - Contractually Required Principal and Interest Cash Payments, Management's Estimates of Expected Total Cash Payments (Detail) (USD $)	Sep. 30, 2014	Jul. 01, 2014
In Thousands, unless otherwise specified		MidSouth Bank [Member]
Business Acquisition [Line Items]	'	'
Contractually required principal and interest	$7,535	$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_Summary_of_Fair_V

Acquisitions - Summary of Fair Value of Acquired Loans and Unpaid Principal Balance (Detail) (MidSouth Bank [Member], USD $)	Jul. 01, 2014
In Thousands, unless otherwise specified
Unpaid Principal Value [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	$191,692
Unpaid Principal Value [Member] | Residential real estate, 1-4 family [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	39,425
Unpaid Principal Value [Member] | Commercial real estate, Nonfarm, nonresidential [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	82,465
Unpaid Principal Value [Member] | Construction and Land Development [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	43,766
Unpaid Principal Value [Member] | Commercial Loans [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	16,311
Unpaid Principal Value [Member] | Consumer And Other Loans [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	1,865
Unpaid Principal Value [Member] | Purchased Credit Impaired [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	7,860
Fair Value [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	184,345
Fair Value [Member] | Residential real estate, 1-4 family [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	38,618
Fair Value [Member] | Commercial real estate, Nonfarm, nonresidential [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	80,566
Fair Value [Member] | Construction and Land Development [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	42,454
Fair Value [Member] | Commercial Loans [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	15,352
Fair Value [Member] | Consumer And Other Loans [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	1,828
Fair Value [Member] | Purchased Credit Impaired [Member]	'
Business Acquisition [Line Items]	'
Unpaid principal amount and Fair value of acquired loans	$5,527

Acquisitions_ProForma_Financia

Acquisitions - Pro-Forma Financial Information And Actual Results of Acquisition (Detail) (MidSouth Bank [Member], USD $)	3 Months Ended	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidSouth Bank [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Net interest income	$8,019	$30,014	$22,547
Net income available to common shareholders	$1,411	$5,790	$4,115
Earnings per share-basic	$0.23	$0.61	$0.71
Earnings per share-diluted	$0.23	$0.60	$0.69

Securities_Summary_of_Amortize

Securities - Summary of Amortized Cost and Fair Value of Available for Sale Securities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$346,743	$275,860
Gross Unrealized Gains	3,382	1,560
Gross Unrealized Losses	-3,375	-8,905
Fair Value	346,750	268,515
U.S. Government Sponsored Entities and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	20,130	16,029
Gross Unrealized Gains	232	'
Gross Unrealized Losses	-550	-1,305
Fair Value	19,812	14,724
U.S. Treasury Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	7,000	'
Fair Value	7,000	'
Mortgage-Backed Securities: Residential [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	307,633	259,831
Gross Unrealized Gains	3,029	1,560
Gross Unrealized Losses	-2,776	-7,600
Fair Value	307,886	253,791
Mortgage-Backed Securities: Commercial [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	6,490	'
Gross Unrealized Gains	26	'
Gross Unrealized Losses	-49	'
Fair Value	6,467	'
State and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	5,490	'
Gross Unrealized Gains	95	'
Fair Value	$5,585	'

Securities_Schedule_of_Amortiz

Securities - Schedule of Amortized Cost and Fair Value of Held to Maturity Securities Portfolio (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	$56,293	$56,575
Gross Unrecognized Gains	811	394
Gross Unrecognized Losses	-1,200	-2,965
Fair Value	55,904	54,004
U.S. Government Sponsored Entities and Agencies [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	6,546	8,225
Gross Unrecognized Gains	119	12
Gross Unrecognized Losses	-167	-484
Fair Value	6,498	7,753
Mortgage-Backed Securities: Residential [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	40,524	39,043
Gross Unrecognized Gains	417	293
Gross Unrecognized Losses	-940	-2,061
Fair Value	40,001	37,275
State and Political Subdivisions [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	9,223	9,307
Gross Unrecognized Gains	275	89
Gross Unrecognized Losses	-93	-420
Fair Value	$9,405	$8,976

Securities_Summary_of_Sales_of

Securities - Summary of Sales of Available for Sale Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Available-for-sale Securities [Abstract]	'	'	'	'
Proceeds	$9,767	'	$34,087	$11,555
Gross gains	31	'	256	141
Gross losses	($9)	'	($163)	($63)

Securities_Schedule_of_Amortiz1

Securities - Schedule of Amortized Cost and Fair Value of Investment Securities Portfolio by Contractual Maturity (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available for sale	'	'
Amortized Cost, Three months or less	$7,000	'
Amortized Cost, Over three months through one year	'	'
Amortized Cost, Over one year through five years	259	'
Amortized Cost, Over five years through ten years	13,030	'
Amortized Cost, Over ten years	12,331	'
Amortized Cost, Total	346,743	275,860
Held to maturity	'	'
Amortized Cost, Over three months through one year	251	'
Amortized Cost, Over one year through five years	1,422	'
Amortized Cost, Over five years through ten years	1,106	'
Amortized Cost, Over ten years	12,990	'
Amortized Cost, Mortgage-backed securities: residential	40,524	'
Amortized Cost, Total	56,293	56,575
Available for sale	'	'
Fair Value, Three months or less	7,000	'
Fair Value, Over three months through one year	'	'
Fair Value, Over one year through five years	263	'
Fair Value, Over five years through ten years	13,147	'
Fair Value, Over ten years	11,987	'
Fair Value, Mortgage-backed securities	6,467	'
Fair Value, Mortgage-backed securities	307,886	'
Fair Value	346,750	268,515
Held to maturity	'	'
Fair Value, Over three months through one year	252	'
Fair Value, Over one year through five years	1,478	'
Fair Value, Over five years through ten years	1,116	'
Fair Value, Over ten years	13,057	'
Fair Value, Mortgage-backed securities: residential	40,001	'
Fair Value	55,904	54,004
Mortgage-Backed Securities: Commercial [Member]	'	'
Available for sale	'	'
Amortized Cost, Mortgage-backed securities	6,490	'
Amortized Cost, Total	6,490	'
Available for sale	'	'
Fair Value	6,467	'
Mortgage-Backed Securities: Residential [Member]	'	'
Available for sale	'	'
Amortized Cost, Mortgage-backed securities	307,633	'
Amortized Cost, Total	307,633	259,831
Held to maturity	'	'
Amortized Cost, Total	40,524	39,043
Available for sale	'	'
Fair Value	307,886	253,791
Held to maturity	'	'
Fair Value	$40,001	$37,275

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Carrying value of pledged securities	$347,748,000	$194,925,000
Other Than US Government Sponsored Entities and Agencies[Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amount of holdings of securities of any one issuer	$0	$0

Securities_Schedule_of_Unreali

Securities - Schedule of Unrealized Losses and Fair Value by Major Security Type (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months Available for Sale Fair Value	$89,510	$181,800
Less Than 12 Months Available for sale Unrealized Losses	-923	-7,890
12 Months or Longer Available for sale Fair Value	60,596	13,462
12 Months or Longer Available for sale Unrealized Losses	-2,452	-1,015
Available for sale Fair Value, Total	150,106	195,262
Available for sale Unrealized Losses, Total	-3,375	-8,905
Less Than 12 Months Held to maturity Fair Value	15,065	31,882
Less Than 12 Months Held to maturity Unrealized Losses	-449	-2,426
12 Months or Longer Held to maturity Fair Value	17,972	5,312
12 Months or Longer Held to maturity Unrealized Losses	-751	-539
Held to maturity Fair Value, Total	33,037	37,194
Held to maturity Unrealized Losses, Total	-1,200	-2,965
U.S. Government Sponsored Entities and Agencies [Member]	'	'
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months Held to maturity Fair Value	'	6,168
Less Than 12 Months Held to maturity Unrealized Losses	'	-332
12 Months or Longer Held to maturity Fair Value	2,833	848
12 Months or Longer Held to maturity Unrealized Losses	-167	-152
Held to maturity Fair Value, Total	2,833	7,016
Held to maturity Unrealized Losses, Total	-167	-484
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	82,851	168,817
Less Than 12 Months Available for sale Unrealized Losses	-870	-6,762
12 Months or Longer Available for sale Fair Value	52,533	11,721
12 Months or Longer Available for sale Unrealized Losses	-1,906	-838
Available for sale Fair Value, Total	135,384	180,538
Available for sale Unrealized Losses, Total	-2,776	-7,600
Less Than 12 Months Held to maturity Fair Value	14,556	19,952
Less Than 12 Months Held to maturity Unrealized Losses	-449	-1,752
12 Months or Longer Held to maturity Fair Value	11,189	4,042
12 Months or Longer Held to maturity Unrealized Losses	-491	-309
Held to maturity Fair Value, Total	25,745	23,994
Held to maturity Unrealized Losses, Total	-940	-2,061
State and Political Subdivisions [Member]	'	'
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months Held to maturity Fair Value	509	5,762
Less Than 12 Months Held to maturity Unrealized Losses	'	-342
12 Months or Longer Held to maturity Fair Value	3,950	422
12 Months or Longer Held to maturity Unrealized Losses	-93	-78
Held to maturity Fair Value, Total	4,459	6,184
Held to maturity Unrealized Losses, Total	-93	-420
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	1,048	12,983
Less Than 12 Months Available for sale Unrealized Losses	-4	-1,128
12 Months or Longer Available for sale Fair Value	8,063	1,741
12 Months or Longer Available for sale Unrealized Losses	-546	-177
Available for sale Fair Value, Total	9,111	14,724
Available for sale Unrealized Losses, Total	-550	-1,305
Mortgage-Backed Securities: Commercial [Member]	'	'
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months Available for Sale Fair Value	5,611	'
Less Than 12 Months Available for sale Unrealized Losses	-49	'
Available for sale Fair Value, Total	5,611	'
Available for sale Unrealized Losses, Total	($49)	'

Securities_Schedule_of_Unreali1

Securities - Schedule of Unrealized Losses and Fair Value by Major Security Type (Parenthetical) (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months Held to maturity Unrealized Losses	$449	$2,426
Maximum [Member] | State and Political Subdivisions [Member]	'	'
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]	'	'
Less Than 12 Months Held to maturity Unrealized Losses	$1	'

Loans_Summary_of_Loans_Detail

Loans - Summary of Loans (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	$715,360	'	$422,025	'	'
Deferred loan fees, net	-873	'	-721	'	'
Total loans that are not PCI loans	714,487	'	421,304	'	'
Allowance for loan losses	-5,883	-5,771	-4,900	-4,432	-3,983
Total loans, net of allowance for loan losses	713,392	'	416,404	'	'
PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	4,788	'	'	'	'
Construction and Land Development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	213,975	'	113,710	'	'
Allowance for loan losses	-2,141	-1,910	-1,552	-1,585	-1,342
Construction and Land Development [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	78	'	'	'	'
Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	218,149	'	114,852	'	'
Commercial Real Estate Nonfarm and Nonresidential [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	1,830	'	'	'	'
Commercial Real Estate, Other [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	5,671	'	10,350	'	'
Commercial Real Estate, Other [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	532	'	'	'	'
Real Estate Residential One To Four Family [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	128,693	'	98,615	'	'
Real Estate Residential One To Four Family [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	842	'	'	'	'
Residential Real Estate, Other [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	72,737	'	39,851	'	'
Residential Real Estate, Other [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	152	'	'	'	'
Commercial and Industrial [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	68,693	'	36,397	'	'
Allowance for loan losses	-576	-508	-337	-406	-275
Commercial and Industrial [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	1,352	'	'	'	'
Consumer and Other Financing Receivable [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	7,442	'	8,250	'	'
Allowance for loan losses	-49	-53	-98	-150	-206
Consumer and Other Financing Receivable [Member] | PCI Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans	$2	'	'	'	'

Loans_Activity_in_Allowance_fo

Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance For Loan Losses [Line Items]	'	'	'	'
Beginning balance	$5,771	'	$4,900	$3,983
Provision for loan losses	664	225	1,489	457
Loans charged-off	-555	'	-555	-107
Recoveries	3	'	49	99
Total ending allowance balance	5,883	4,432	5,883	4,432
Construction and Land Development [Member]	'	'	'	'
Allowance For Loan Losses [Line Items]	'	'	'	'
Beginning balance	1,910	'	1,552	1,342
Provision for loan losses	231	'	589	243
Total ending allowance balance	2,141	1,585	2,141	1,585
Commercial Real Estate [Member]	'	'	'	'
Allowance For Loan Losses [Line Items]	'	'	'	'
Beginning balance	1,740	'	1,511	1,267
Provision for loan losses	173	'	402	20
Loans charged-off	-540	'	-540	'
Total ending allowance balance	1,373	1,287	1,373	1,287
Residential Portfolio Segment [Member]	'	'	'	'
Allowance For Loan Losses [Line Items]	'	'	'	'
Beginning balance	1,560	'	1,402	893
Provision for loan losses	192	'	304	119
Loans charged-off	-11	'	-11	-107
Recoveries	3	'	49	99
Total ending allowance balance	1,744	1,004	1,744	1,004
Commercial and Industrial [Member]	'	'	'	'
Allowance For Loan Losses [Line Items]	'	'	'	'
Beginning balance	508	'	337	275
Provision for loan losses	72	'	243	131
Loans charged-off	-4	'	-4	'
Total ending allowance balance	576	406	576	406
Consumer and Other Financing Receivable [Member]	'	'	'	'
Allowance For Loan Losses [Line Items]	'	'	'	'
Beginning balance	53	'	98	206
Provision for loan losses	-4	'	-49	-56
Total ending allowance balance	$49	$150	$49	$150

Loans_Additional_Information_D

Loans - Additional Information (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Jul. 01, 2014
			PCI Loans [Member]	PCI Loans [Member]	PCI Loans [Member]
Loans [Line Items]	'	'	'	'	'
Allowance for loan losses for PCI loans	$0	$0	'	'	'
Estimated credit discount	'	'	'	'	5,014,000
Estimated fair value	'	'	'	'	178,818,000
Unpaid principal amount	'	'	'	'	183,832,000
Accretion income	'	'	$120,000	$120,000	'

Loans_Allowance_for_Loan_Losse

Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]	'	'	'	'	'
Allowance for loan losses, Individually evaluated for impairment	$39	'	$548	'	'
Allowance for loan losses, Collectively evaluated for impairment	5,844	'	4,352	'	'
Purchased credit-impaired loans	'	'	0	'	'
Purchased credit-impaired loans	0	'	'	'	'
Total ending allowance balance	5,883	5,771	4,900	4,432	3,983
Total ending allowance balance	5,883	5,771	4,900	4,432	3,983
Loans, Individually evaluated for impairment	894	'	4,623	'	'
Loans, Collectively evaluated for impairment	714,466	'	417,402	'	'
Purchased credit-impaired loans	4,788	'	0	'	'
Total ending loans balance	720,148	'	422,025	'	'
Construction and Land Development [Member]	'	'	'	'	'
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]	'	'	'	'	'
Allowance for loan losses, Collectively evaluated for impairment	2,141	'	1,552	'	'
Total ending allowance balance	2,141	1,910	1,552	1,585	1,342
Total ending allowance balance	2,141	1,910	1,552	1,585	1,342
Loans, Collectively evaluated for impairment	213,975	'	113,710	'	'
Purchased credit-impaired loans	78	'	'	'	'
Total ending loans balance	214,053	'	113,710	'	'
Commercial Real Estate [Member]	'	'	'	'	'
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]	'	'	'	'	'
Allowance for loan losses, Individually evaluated for impairment	'	'	455	'	'
Allowance for loan losses, Collectively evaluated for impairment	1,373	'	1,056	'	'
Total ending allowance balance	1,373	1,740	1,511	1,287	1,267
Total ending allowance balance	1,373	1,740	1,511	1,287	1,267
Loans, Individually evaluated for impairment	835	'	3,361	'	'
Loans, Collectively evaluated for impairment	222,985	'	121,841	'	'
Purchased credit-impaired loans	2,362	'	'	'	'
Total ending loans balance	226,182	'	125,202	'	'
Residential Portfolio Segment [Member]	'	'	'	'	'
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]	'	'	'	'	'
Allowance for loan losses, Individually evaluated for impairment	'	'	93	'	'
Allowance for loan losses, Collectively evaluated for impairment	1,744	'	1,309	'	'
Total ending allowance balance	1,744	1,560	1,402	1,004	893
Total ending allowance balance	1,744	1,560	1,402	1,004	893
Loans, Individually evaluated for impairment	'	'	1,262	'	'
Loans, Collectively evaluated for impairment	201,430	'	137,204	'	'
Purchased credit-impaired loans	994	'	'	'	'
Total ending loans balance	202,424	'	138,466	'	'
Commercial and Industrial [Member]	'	'	'	'	'
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]	'	'	'	'	'
Allowance for loan losses, Individually evaluated for impairment	39	'	'	'	'
Allowance for loan losses, Collectively evaluated for impairment	537	'	337	'	'
Total ending allowance balance	576	508	337	406	275
Total ending allowance balance	576	508	337	406	275
Loans, Individually evaluated for impairment	59	'	'	'	'
Loans, Collectively evaluated for impairment	68,634	'	36,397	'	'
Purchased credit-impaired loans	1,352	'	'	'	'
Total ending loans balance	70,045	'	36,397	'	'
Consumer and Other Financing Receivable [Member]	'	'	'	'	'
Allowance For Loan Losses And Recorded Investment In Loans [Line Items]	'	'	'	'	'
Allowance for loan losses, Collectively evaluated for impairment	49	'	98	'	'
Total ending allowance balance	49	53	98	150	206
Total ending allowance balance	49	53	98	150	206
Loans, Collectively evaluated for impairment	7,442	'	8,250	'	'
Purchased credit-impaired loans	2	'	'	'	'
Total ending loans balance	$7,444	'	$8,250	'	'

Loans_Summary_of_Impaired_Loan

Loans - Summary of Impaired Loans by Class of Loans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance, With no allowance recorded	'	'	'	'	$4,167
Unpaid Principal Balance	2,481	'	2,481	'	6,189
Recorded Investment, With no allowance recorded	'	'	'	'	2,601
Recorded Investment	894	'	894	'	4,623
Unpaid Principal Balance, With an allowance recorded	59	'	59	'	4,167
Recorded Investment, With an allowance recorded	59	'	59	'	2,601
Allowance for Loan Losses Allocated	39	'	39	'	548
Average Recorded Investment, With no allowance recorded	211	36	71	36	'
Average Recorded Investment, With an allowance recorded	1,258	2,675	1,378	2,694	'
Average Recorded Investment	1,469	2,711	1,449	2,730	'
Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance, With no allowance recorded	2,422	'	2,422	'	2,480
Recorded Investment, With no allowance recorded	835	'	835	'	1,375
Unpaid Principal Balance, With an allowance recorded	'	'	'	'	2,480
Recorded Investment, With an allowance recorded	'	'	'	'	1,375
Allowance for Loan Losses Allocated	'	'	'	'	455
Average Recorded Investment, With no allowance recorded	211	'	71	'	'
Average Recorded Investment, With an allowance recorded	1,194	1,375	837	1,375	'
Commercial and Industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance, With an allowance recorded	59	'	59	'	'
Recorded Investment, With an allowance recorded	59	'	59	'	'
Allowance for Loan Losses Allocated	39	'	39	'	'
Average Recorded Investment, With an allowance recorded	64	'	65	20	'
Real Estate Residential One To Four Family [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance, With no allowance recorded	'	'	'	'	1,687
Recorded Investment, With no allowance recorded	'	'	'	'	1,226
Unpaid Principal Balance, With an allowance recorded	'	'	'	'	1,687
Recorded Investment, With an allowance recorded	'	'	'	'	1,226
Allowance for Loan Losses Allocated	'	'	'	'	93
Average Recorded Investment, With no allowance recorded	'	36	'	36	'
Average Recorded Investment, With an allowance recorded	'	1,226	476	1,226	'
Construction and Land Development [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Average Recorded Investment, With no allowance recorded	'	'	'	'	'
Average Recorded Investment, With an allowance recorded	'	$74	'	$73	'

Loans_Schedule_of_Recorded_Inv

Loans - Schedule of Recorded Investment in Nonaccrual and Loans Past Due Over 90 Days on Accrual by Class of Loans (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	$2,904	$2,601
Recorded Investment, Loans Past Due Over 90 Days	452	'
Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	1,628	1,375
Commercial Real Estate, Other [Member]	'	'
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	532	'
Real Estate Residential One To Four Family [Member]	'	'
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	337	1,226
Recorded Investment, Loans Past Due Over 90 Days	411	'
Residential Real Estate, Other [Member]	'	'
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	42	'
Construction and Land Development [Member]	'	'
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	78	'
Commercial and Industrial Financing Receivable [Member]	'	'
Financing Receivable Recorded Investment Nonaccrual Loans [Line Items]	'	'
Recorded Investment, Nonaccrual	287	'
Recorded Investment, Loans Past Due Over 90 Days	$41	'

Loans_Schedule_of_Aging_of_Rec

Loans - Schedule of Aging of Recorded Investment in Past Due Loans by Class of Loans (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, 30-59 Days Past Due	$862	$2,230
Aging of Recorded Investment, 60-89 Days Past Due	32	'
Aging of Recorded Investment, Greater Than 89 Days Past Due	3,356	2,601
Aging of Recorded Investment, Total Past Due	4,250	4,831
Aging of Recorded Investment, Loans Not Past Due	711,110	417,194
Aging of Recorded Investment, Total	715,360	422,025
Construction and Land Development [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, Greater Than 89 Days Past Due	78	'
Aging of Recorded Investment, Total Past Due	78	'
Aging of Recorded Investment, Loans Not Past Due	213,897	113,710
Aging of Recorded Investment, Total	213,975	113,710
Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, 30-59 Days Past Due	'	1,985
Aging of Recorded Investment, Greater Than 89 Days Past Due	1,628	1,375
Aging of Recorded Investment, Total Past Due	1,628	3,360
Aging of Recorded Investment, Loans Not Past Due	216,521	111,492
Aging of Recorded Investment, Total	218,149	114,852
Commercial Real Estate, Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, Greater Than 89 Days Past Due	532	'
Aging of Recorded Investment, Total Past Due	532	'
Aging of Recorded Investment, Loans Not Past Due	5,139	10,350
Aging of Recorded Investment, Total	5,671	10,350
Real Estate Residential One To Four Family [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, 30-59 Days Past Due	861	245
Aging of Recorded Investment, Greater Than 89 Days Past Due	748	1,226
Aging of Recorded Investment, Total Past Due	1,609	1,471
Aging of Recorded Investment, Loans Not Past Due	127,084	97,144
Aging of Recorded Investment, Total	128,693	98,615
Residential Real Estate, Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, Greater Than 89 Days Past Due	42	'
Aging of Recorded Investment, Total Past Due	42	'
Aging of Recorded Investment, Loans Not Past Due	72,695	39,851
Aging of Recorded Investment, Total	72,737	39,851
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, 60-89 Days Past Due	32	'
Aging of Recorded Investment, Greater Than 89 Days Past Due	328	'
Aging of Recorded Investment, Total Past Due	360	'
Aging of Recorded Investment, Loans Not Past Due	68,333	36,397
Aging of Recorded Investment, Total	68,693	36,397
Consumer and Other Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Aging of Recorded Investment, 30-59 Days Past Due	1	'
Aging of Recorded Investment, Total Past Due	1	'
Aging of Recorded Investment, Loans Not Past Due	7,441	8,250
Aging of Recorded Investment, Total	$7,442	$8,250

Loans_Summary_of_Risk_Category

Loans - Summary of Risk Category of Loans by Class of Loans (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Risk Category Of Loans [Line Items]	'	'
Total Loans	$715,360	$422,025
Construction and Land Development [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	213,975	113,710
Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	218,149	114,852
Commercial Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	5,671	10,350
Real Estate Residential One To Four Family [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	128,693	98,615
Residential Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	72,737	39,851
Commercial and Industrial [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	68,693	36,397
Consumer and Other Financing Receivable [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	7,442	8,250
Pass [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	705,198	416,319
Pass [Member] | Construction and Land Development [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	213,772	113,710
Pass [Member] | Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	214,202	110,938
Pass [Member] | Commercial Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	5,142	10,350
Pass [Member] | Real Estate Residential One To Four Family [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	125,676	96,823
Pass [Member] | Residential Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	72,502	39,851
Pass [Member] | Commercial and Industrial [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	66,462	36,397
Pass [Member] | Consumer and Other Financing Receivable [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	7,442	8,250
Special Mention [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	2,179	'
Special Mention [Member] | Construction and Land Development [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	125	'
Special Mention [Member] | Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	726	'
Special Mention [Member] | Real Estate Residential One To Four Family [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	355	'
Special Mention [Member] | Residential Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	87	'
Special Mention [Member] | Commercial and Industrial [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	886	'
Substandard [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	7,983	5,706
Substandard [Member] | Construction and Land Development [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	78	'
Substandard [Member] | Commercial Real Estate Nonfarm and Nonresidential [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	3,221	3,914
Substandard [Member] | Commercial Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	529	'
Substandard [Member] | Real Estate Residential One To Four Family [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	2,662	1,792
Substandard [Member] | Residential Real Estate, Other [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	148	'
Substandard [Member] | Commercial and Industrial [Member]	'	'
Risk Category Of Loans [Line Items]	'	'
Total Loans	$1,345	'

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 Loans (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Receivables [Abstract]	'
Contractually required principal and interest	$7,535
Non-accretable difference	-1,629
Cash flows expected to be collected	5,906
Accretable yield	-1,118
Carrying value of acquired loans	4,788
Allowance for loan losses	'
Carrying value less allowance for loan losses	$4,788

Loan_Servicing_Schedule_of_Loa

Loan Servicing - Schedule of Loans Serviced Not Reported as Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Loans Servicing For Institutional Investors [Line Items]	'	'
Loan portfolios serviced	$4,104	$3,714
Federal Home Loan Mortgage Corporation [Member]	'	'
Loans Servicing For Institutional Investors [Line Items]	'	'
Loan portfolios serviced	398,161	348,121
Other [Member]	'	'
Loans Servicing For Institutional Investors [Line Items]	'	'
Loan portfolios serviced	$4,473	$5,088

Loan_Servicing_Components_of_N

Loan Servicing - Components of Net Loan Servicing Fees (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Transfers and Servicing [Abstract]	'	'	'	'
Loan servicing fees	$253	$217	$720	$584
Amortization of loan servicing fees	-180	-326	-547	-991
Decrease in impairment	0	90	0	90
Total	$73	($19)	$173	($317)

Loan_Servicing_Additional_Info

Loan Servicing - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Transfers and Servicing [Abstract]	'	'
Fair value of servicing rights	$4,104	$3,714
Weighted average discount rate	10.50%	10.50%
Weighted average prepayment speed	10.10%	8.80%
Weighted average amortization period	'6 years 7 months 28 days	'

Loan_Servicing_Schedule_of_Est

Loan Servicing - Schedule of Estimated Amortization Expense (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'
2014	$444
2015	444
2016	$444

ShareBased_Payments_Additional

Share-Based Payments - Additional Information (Detail) (USD $)

9 Months Ended

12 Months Ended

0 Months Ended

9 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2007

Jul. 01, 2014

Jul. 01, 2014

Jul. 01, 2014

Sep. 30, 2014

Sep. 30, 2014

Apr. 30, 2013

Dec. 31, 2007

Sep. 30, 2014

Sep. 30, 2014

Apr. 30, 2010

Sep. 30, 2014

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

2010 Offering [Member]

2007 Stock Option Plan [Member]

2007 Stock Option Plan [Member]

2007 Stock Option Plan [Member]

2007 Stock Option Plan [Member]

2007 Stock Option Plan [Member]

2010 Amended Stock Plan [Member]

Restricted Stock [Member]

MidSouth Bank [Member]

MidSouth Bank [Member]

Minimum [Member]

Maximum [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

'

'

'

'

'

'

'

Number of warrants exercised

0

2,500

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash proceeds on warrants exercised

$0

$30

'

'

'

'

'

'

'

'

'

'

'

'

'

Intrinsic value of warrants exercised

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants outstanding

'

'

'

'

'

'

'

31,877

'

'

'

'

'

'

'

Trigger value of 2010 warrant, price per share.

$15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrants, contingent redemption price

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of options authorized

'

'

'

'

'

'

'

'

'

'

551,250

'

'

1,000,000

'

Increase in shares authorized

'

'

'

'

'

'

'

'

'

1,500,000

'

'

'

'

'

Increased number of authorized shares

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

Vesting period of shares

'

'

'

'5 years

'

'

'

'

'

'

'

'3 years

'5 years

'

'5 years

Options contractual term

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

Number of shares authorized for issuance

604,551

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of options granted

'

'

'

33,750

'

'

'

'

'

'

'

'

'

'

87,374

Number of options cancelled

'

'

166,448

'

'

'

'

'

'

'

'

'

'

'

'

Number of options exchanged for common stock

'

'

32,814

'

'

'

'

'

'

'

'

'

'

'

'

Cash awards

'

'

142

'

'

'

'

'

'

'

'

'

'

'

'

Common stock options converted

'

'

'

'

'

322,300

'

'

'

'

'

'

'

'

'

Options to purchase shares of common stock

'

'

'

'

'

'

137,280

'

'

'

'

'

'

'

'

Exercise price of options

$11.30

'

'

'

'

'

$8.57

'

'

'

'

'

'

'

'

Share-based compensation arrangements by share-based payment award, estimated grant date fair value

$4.12

$1.92

'

'

$14.50

$6.31

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost, nonvested stock options

$740

'

'

'

'

'

'

'

'

'

'

'

'

'

$931

Unrecognized compensation cost, period of recognition

'1 year 8 months 12 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'4 years 7 days

ShareBased_Payments_Fair_Value

Share-Based Payments - Fair Value Assumptions of Stock Options (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Risk-free interest rate	1.81%	1.65%
Expected term	'5 years 10 months 24 days	'7 years 6 months
Expected stock price volatility	10.85%	12.63%
Dividend yield	0.23%	0.99%

ShareBased_Payments_Summary_of

Share-Based Payments - Summary of Company's Stock Option Activities (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'
Shares, Outstanding, Beginning Balance	946,644	'	'
Shares, Granted	316,960	'	'
Shares, Exercised	-6,508	-5,755	'
Shares, Forfeited, expired, or cancelled	-19,134	'	'
Shares, Outstanding, Ending Balance	1,237,962	'	946,644
Shares, Vested or expected to vest	1,176,064	'	'
Shares, Exercisable at period end	807,599	'	'
Weighted Average Exercise Price, Outstanding, Beginning Balance	$11.27	'	'
Weighted Average Exercise Price, Granted	$11.36	'	'
Weighted Average Exercise Price, Exercised	$8.63	'	'
Weighted Average Exercise Price, Forfeited, expired, or cancelled	$11.71	'	'
Weighted Average Exercise Price, Outstanding, Ending Balance	$11.30	'	$11.27
Weighted Average Exercise Price, Vested or expected to vest	$11.30	'	'
Weighted Average Exercise Price, Exercisable at period end	$10.61	'	'
Weighted Average Remaining Contractual Term, Outstanding	'6 years 11 months 5 days	'	'6 years 9 months 22 days
Weighted Average Remaining Contractual Term, Vested or expected to vest	'6 years 11 months 5 days	'	'
Weighted Average Remaining Contractual Term, Exercisable at period end	'6 years 1 month 6 days	'	'
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$1,635	'	'
Aggregate Intrinsic Value, Outstanding, Ending Balance	2,076	'	1,635
Aggregate Intrinsic Value, Vested or expected to vest	1,972	'	'
Aggregate Intrinsic Value, Exercisable at period end	$1,630	'	'

ShareBased_Payments_Summary_of1

Share-Based Payments - Summary of Activity for Nonvested Restricted Share Awards (Detail) (Restricted Stock [Member], USD $)	9 Months Ended
	Sep. 30, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Shares, Nonvested, Beginning Balance	28,685
Shares, Granted	87,374
Shares, Vested	-9,166
Shares, Forfeited	-3,649
Shares, Nonvested, Ending Balance	103,244
Weighted-Average Grant-Date Fair Value, Nonvested, Beginning Balance	$13
Weighted-Average Grant-Date Fair Value, Granted	$14.12
Weighted-Average Grant-Date Fair Value, Vested	$13
Weighted-Average Grant-Date Fair Value, Forfeited	$14.32
Weighted-Average Grant-Date Fair Value, Nonvested, Ending Balance	$13.91

Regulatory_Capital_Matters_Act

Regulatory Capital Matters - Actual and Required Capital Amounts and Ratios (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Bank [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital to risk weighted assets, Actual Amount	$109,810	$73,305
Tier 1 (Core) Capital to risk weighted assets, Actual Amount	103,927	68,405
Tier 1 (Core) Capital to average assets, Actual Amount	103,927	68,405
Total Capital to risk weighted assets, Actual Ratio	12.99%	14.59%
Tier 1 (Core) Capital to risk weighted assets, Actual Ratio	12.29%	13.62%
Tier 1 (Core) Capital to average assets, Actual Ratio	8.79%	9.62%
Total Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	67,629	40,192
Tier 1 (Core) Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	33,815	20,096
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Amount	47,311	28,455
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	4.00%	4.00%
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Ratio	4.00%	4.00%
Total Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	84,537	50,239
Tier 1 (Core) Capital to risk weighted assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	50,722	30,144
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	59,139	35,569
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	6.00%	6.00%
Tier 1 (Core) Capital to average assets, To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	5.00%	5.00%
Company [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital to risk weighted assets, Actual Amount	110,328	74,430
Tier 1 (Core) Capital to risk weighted assets, Actual Amount	104,445	69,530
Tier 1 (Core) Capital to average assets, Actual Amount	104,445	69,530
Total Capital to risk weighted assets, Actual Ratio	13.05%	14.81%
Tier 1 (Core) Capital to risk weighted assets, Actual Ratio	12.35%	13.83%
Tier 1 (Core) Capital to average assets, Actual Ratio	8.83%	9.78%
Total Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	67,643	40,209
Tier 1 (Core) Capital to risk weighted assets, Required For Capital Adequacy Purposes Amount	33,821	20,105
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Amount	$47,319	$28,449
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	4.00%	4.00%
Tier 1 (Core) Capital to average assets, Required For Capital Adequacy Purposes Ratio	4.00%	4.00%

Regulatory_Capital_Matters_Add

Regulatory Capital Matters - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2014
						Loans Held For Sale [Member]	Loans Held For Sale [Member]	Loans Held For Sale [Member]	Maximum [Member]
									Loans Held For Sale [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'	'	'	'	'	'	'	'
Description of dividend restriction pertaining to the dividends that the company could declare	'	'	'9,190 plus any 2014 net profits retained to the date of declaration	'	'	'	'	'	'
Unpaid principal balance of loans held for sale	$2,481	'	$2,481	'	$6,189	$24,897	$24,897	'	'
Change in fair value related to loans held for sale	1,875	714	4,226	3,611	'	217	755	'	'
Loans held for sale carried at fair value	$25,652	'	$25,652	'	$10,694	'	'	$0	'
Term of loan	'	'	'	'	'	'	'	'	'90 days

Fair_Value_Assets_and_Liabilit

Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	$346,750	$268,515
Loans held for sale	25,652	10,694
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	19,812	14,724
U.S. Treasury Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	7,000	'
Mortgage-Backed Securities: Residential [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	307,886	253,791
Mortgage-Backed Securities: Commercial [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	6,467	'
State and Political Subdivisions [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	5,585	'
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	8,739	'
Loans held for sale	'	'
Mortgage banking derivatives	'	'
Mortgage banking derivatives	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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	1,739	'
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	7,000	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-Backed Securities: Residential [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-Backed Securities: Commercial [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Political Subdivisions [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
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	338,011	268,515
Loans held for sale	25,652	'
Mortgage banking derivatives	368	464
Mortgage banking derivatives	54	'
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	18,073	14,724
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
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	307,886	253,791
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	6,467	'
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	5,585	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
Loans held for sale	'	'
Mortgage banking derivatives	'	'
Mortgage banking derivatives	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [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	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-Backed Securities: Residential [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-Backed Securities: Commercial [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities available for sale	'	'

Fair_Value_Assets_Measured_at_

Fair Value - Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Significant Other Observable Inputs (Level 2) [Member]

Significant Other Observable Inputs (Level 2) [Member]

Significant Other Observable Inputs (Level 2) [Member]

Significant Other Observable Inputs (Level 2) [Member]

Significant Unobservable Inputs (Level 3) [Member]

Significant Unobservable Inputs (Level 3) [Member]

Significant Unobservable Inputs (Level 3) [Member]

Significant Unobservable Inputs (Level 3) [Member]

Commercial and industrial [Member]

Construction and Land Development [Member]

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Commercial and industrial [Member]

Construction and Land Development [Member]

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Commercial and industrial [Member]

Construction and Land Development [Member]

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Impaired loans

'

'

'

'

'

'

'

'

$20

$800

$1,133

$920

Fair_Value_Additional_informat

Fair Value - Additional information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value Measurements Of Financial Instruments [Line Items]	'	'	'	'	'
Carrying amount of impaired loans with specific allocations	$894	'	$894	'	$4,623
Valuation allowance for impaired loans	39	'	39	'	548
Additional provision for loan losses	664	225	1,489	457	'
Foreclosed assets	1,690	'	1,690	'	181
Write-down value during period	'	0	'	190	'
Portion at Fair Value Measurement [Member]	'	'	'	'	'
Fair Value Measurements Of Financial Instruments [Line Items]	'	'	'	'	'
Carrying amount of impaired loans with specific allocations	59	'	59	'	2,601
Valuation allowance for impaired loans	39	'	39	'	548
Changes Measurement [Member]	'	'	'	'	'
Fair Value Measurements Of Financial Instruments [Line Items]	'	'	'	'	'
Additional provision for loan losses	($7)	$0	$39	$0	'

Fair_Value_Quantitative_Inform

Fair Value - Quantitative Information about Recurring Level 3 Fair Value Measurements (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $)

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

In Thousands, unless otherwise specified

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Construction and Land Development [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Weighted Average [Member]

Weighted Average [Member]

Weighted Average [Member]

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Construction and Land Development [Member]

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Construction and Land Development [Member]

Residential Portfolio Segment [Member]

Commercial Real Estate [Member]

Construction and Land Development [Member]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value

$1,133

$920

$800

'

'

'

'

'

'

'

'

'

Valuation Technique(s)

'

'

'Sales comparison

'

'

'

'

'

'

'

'

'

Unobservable Input(s)

'

'

'Adjustment for differences between comparable sales

'

'

'

'

'

'

'

'

'

Range (Weighted Average)

'

'

'

3.00%

0.00%

0.00%

27.00%

16.00%

40.00%

16.00%

16.00%

40.00%

Fair_Value_Carrying_Amount_and

Fair Value - Carrying Amount and Estimated Fair Value of Financial Instruments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents, Carrying Amount	$36,657	$18,217	$16,390	$24,977
Securities available for sale	346,750	268,515	'	'
Securities held to maturity, Carrying Amount	56,293	56,575	'	'
Securities held to maturity, Fair Value	55,904	54,004	'	'
Loans held for sale, Fair Value	25,652	10,694	'	'
Net loans, Carrying Amount	713,392	416,404	'	'
Restricted equity securities, Carrying Amount	5,349	3,032	'	'
Mortgage servicing rights, Carrying Amount	2,956	2,640	'	'
Mortgage servicing rights, Fair Value	4,104	3,714	'	'
Accrued interest receivable	3,426	2,396	'	'
Deposits, Carrying Amount	1,051,558	681,300	'	'
Federal funds purchased and repurchase agreements, Carrying Amount	34,238	24,291	'	'
Federal Home Loan Bank advances, Carrying Amount	33,000	23,000	'	'
Accrued interest payable	437	222	'	'
Portion at Fair Value Measurement [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents , Fair Value	36,657	18,217	'	'
Securities available for sale	346,750	268,515	'	'
Certificates of deposit held at other financial institutions	250	'	'	'
Securities held to maturity, Fair Value	55,904	54,004	'	'
Loans held for sale, Fair Value	25,652	10,694	'	'
Net loans, Fair Value	709,009	415,515	'	'
Restricted equity securities, Fair Value	'	'	'	'
Mortgage servicing rights, Fair Value	4,104	3,714	'	'
Accrued interest receivable	3,426	2,396	'	'
Deposits, Fair Value	1,053,922	682,300	'	'
Federal funds purchased and repurchase agreements, Fair Value	34,238	24,291	'	'
Federal Home Loan Bank advances, Fair Value	33,181	23,023	'	'
Accrued interest payable	437	222	'	'
Portion at Fair Value Measurement [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	36,657	18,217	'	'
Securities available for sale	8,739	'	'	'
Certificates of deposit held at other financial institutions	'	'	'	'
Securities held to maturity, Fair Value	'	'	'	'
Loans held for sale, Fair Value	'	'	'	'
Net loans, Fair Value	'	'	'	'
Mortgage servicing rights, Fair Value	'	'	'	'
Accrued interest receivable	13	'	'	'
Deposits, Fair Value	719,293	480,000	'	'
Federal funds purchased and repurchase agreements, Fair Value	'	'	'	'
Federal Home Loan Bank advances, Fair Value	'	'	'	'
Accrued interest payable	35	17	'	'
Portion at Fair Value Measurement [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents , Fair Value	'	'	'	'
Securities available for sale	338,011	268,515	'	'
Certificates of deposit held at other financial institutions	250	'	'	'
Securities held to maturity, Fair Value	55,904	54,004	'	'
Loans held for sale, Fair Value	25,652	10,694	'	'
Net loans, Fair Value	'	'	'	'
Mortgage servicing rights, Fair Value	4,104	3,714	'	'
Accrued interest receivable	1,400	1,145	'	'
Deposits, Fair Value	334,629	202,300	'	'
Federal funds purchased and repurchase agreements, Fair Value	34,238	24,291	'	'
Federal Home Loan Bank advances, Fair Value	33,181	23,023	'	'
Accrued interest payable	402	205	'	'
Portion at Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents , Fair Value	'	'	'	'
Securities available for sale	'	'	'	'
Certificates of deposit held at other financial institutions	'	'	'	'
Securities held to maturity, Fair Value	'	'	'	'
Loans held for sale, Fair Value	'	'	'	'
Net loans, Fair Value	709,009	415,515	'	'
Mortgage servicing rights, Fair Value	'	'	'	'
Accrued interest receivable	2,013	1,251	'	'
Deposits, Fair Value	'	'	'	'
Federal funds purchased and repurchase agreements, Fair Value	'	'	'	'
Federal Home Loan Bank advances, Fair Value	'	'	'	'
Accrued interest payable	'	'	'	'
Reported Value Measurement [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents, Carrying Amount	36,657	18,217	'	'
Securities available for sale	346,750	268,515	'	'
Certificates of deposit held at other financial institutions	250	'	'	'
Securities held to maturity, Carrying Amount	56,293	56,575	'	'
Loans held for sale, Carrying Amount	25,652	10,694	'	'
Net loans, Carrying Amount	713,392	416,404	'	'
Restricted equity securities, Carrying Amount	5,349	3,032	'	'
Mortgage servicing rights, Carrying Amount	2,956	2,640	'	'
Accrued interest receivable	3,426	2,396	'	'
Deposits, Carrying Amount	1,051,558	681,300	'	'
Federal funds purchased and repurchase agreements, Carrying Amount	34,238	24,291	'	'
Federal Home Loan Bank advances, Carrying Amount	33,000	23,000	'	'
Accrued interest payable	$437	$222	'	'

Earnings_per_Share_Computation

Earnings per Share - Computation of Earnings per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic	'	'	'	'
Net income available to common shareholders	$1,990	$985	$5,504	$3,075
Less: earnings allocated to participating securities	-27	-8	-57	-11
Net income allocated to common shareholders	1,963	977	5,447	3,064
Weighted average common shares outstanding including participating securities	7,737,710	3,704,437	5,840,620	3,655,722
Less: Participating securities	-105,129	-30,105	-60,840	-13,564
Average shares	7,632,581	3,674,332	5,779,780	3,642,158
Basic earnings per common share	$0.26	$0.27	$0.94	$0.84
Diluted	'	'	'	'
Net income allocated to common shareholders	$1,963	$977	$5,447	$3,064
Weighted average common shares outstanding for basic earnings per common share	7,632,581	3,674,332	5,779,780	3,642,158
Add: Dilutive effects of assumed exercises of stock options	272,634	85,987	170,470	105,052
Add: Dilutive effects of assumed exercises of stock warrants	7,559	2,485	5,033	2,490
Average shares and dilutive potential common shares	7,912,774	3,762,804	6,016,123	3,749,700
Dilutive earnings per common share	$0.25	$0.26	$0.91	$0.82

Earnings_per_Share_Additional_

Earnings per Share - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'
Stock options to purchase shares of the Company's common stock	57,952	274,132	57,952