Horizon Bancorp (HBNC) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 07, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'HORIZON BANCORP /IN/	'
Entity Central Index Key	'0000706129	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	8,695,721

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'	'
Cash and due from banks	$40,500	$30,735
Investment securities, available for sale	514,144	482,801
Investment securities, held to maturity	9,910	'
Loans held for sale	4,594	13,744
Loans, net of allowance for loan losses of $17,848 and $18,270	1,063,571	1,172,447
Premises and equipment	43,473	42,184
Federal Reserve and Federal Home Loan Bank stock	14,184	13,333
Goodwill	19,748	19,748
Other intangible assets	3,477	4,048
Interest receivable	7,506	7,716
Cash value life insurance	35,945	35,192
Other assets	23,972	26,279
Total assets	1,781,024	1,848,227
Deposits	'	'
Non-interest bearing	223,354	209,200
Interest bearing	1,104,966	1,084,953
Total deposits	1,328,320	1,294,153
Borrowings	242,505	345,764
Subordinated debentures	32,448	32,331
Interest payable	488	560
Other liabilities	13,804	16,451
Total liabilities	1,617,565	1,689,259
Commitments and contingent liabilities	'	'
Stockholders' Equity	'	'
Common stock, no par value Authorized, 22,500,000 shares Issued, 8,695,721 and 8,693,471 shares Outstanding, 8,619,716 and 8,617,466 shares	'	'
Additional paid-in capital	32,237	31,965
Retained earnings	118,157	105,402
Accumulated other comprehensive income	565	9,101
Total stockholders' equity	163,459	158,968
Total liabilities and stockholders' equity	1,781,024	1,848,227
Series B Preferred Stock [Member]	'	'
Stockholders' Equity	'	'
Preferred stock, Authorized, 1,000,000 shares Series B shares $.01 par value, $1,000 liquidation value Issued 12,500 shares	$12,500	$12,500

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Allowance for loan losses	$17,848	$18,270
Common stock, par value	'	'
Common stock, shares authorized	22,500,000	22,500,000
Common stock, shares issued	8,695,721	8,693,471
Common stock, shares outstanding	8,619,716	8,617,466
Series B Preferred Stock [Member]	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, liquidation value	$1,000	$1,000
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	12,500	12,500

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income	'	'	'	'
Loans receivable	$14,843	$15,527	$48,189	$42,386
Investment securities	'	'	'	'
Taxable	2,084	2,178	6,153	6,738
Tax exempt	1,114	1,014	3,105	2,944
Total interest income	18,041	18,719	57,447	52,068
Interest Expense	'	'	'	'
Deposits	1,395	1,638	4,320	4,803
Borrowed funds	1,465	1,597	4,369	4,635
Subordinated debentures	512	485	1,504	1,427
Total interest expense	3,372	3,720	10,193	10,865
Net Interest Income	14,669	14,999	47,254	41,203
Provision for loan losses	104	1,041	2,917	1,809
Net Interest Income after Provision for Loan Losses	14,565	13,958	44,337	39,394
Non-interest Income	'	'	'	'
Service charges on deposit accounts	1,083	1,002	2,984	2,477
Wire transfer fees	169	248	562	643
Interchange fees	1,123	885	3,049	2,227
Fiduciary activities	953	971	3,140	2,928
Gain on sale of investment securities (includes $6 and $374 for the three and nine months ended 2013 and $2 for the three and nine months ended 2012, respectively, related to accumulated other comprehensive earnings reclassifications)	6	2	374	2
Gain on sale of mortgage loans	1,667	4,436	7,580	10,121
Mortgage servicing income net of impairment	348	-355	813	-95
Increase in cash value of bank owned life insurance	278	300	787	760
Other income	283	221	930	344
Total non-interest income	5,910	7,710	20,219	19,407
Non-interest Expense	'	'	'	'
Salaries and employee benefits	7,694	7,905	22,919	20,407
Net occupancy expenses	1,172	1,186	3,778	3,216
Data processing	766	754	2,184	1,883
Professional fees	357	366	1,310	1,483
Outside services and consultants	436	624	1,634	1,621
Loan expense	1,040	1,311	3,556	2,879
FDIC insurance expense	270	291	821	798
Other losses	55	309	146	501
Other expense	2,271	2,094	6,487	5,392
Total non-interest expense	14,061	14,840	42,835	38,180
Income Before Income Tax	6,414	6,828	21,721	20,621
Income tax expense (includes $2 and $131 for the three and nine months ended 2013 and $0 for the three and nine months ended 2012, respectively, related to income tax expense from reclassification items)	1,629	1,978	5,960	6,248
Net Income	4,785	4,850	15,761	14,373
Preferred stock dividend and discount accretion	-66	-63	-308	-325
Net Income Available to Common Shareholders	$4,719	$4,787	$15,453	$14,048
Basic Earnings Per Share	$0.55	$0.56	$1.79	$1.81
Diluted Earnings Per Share	$0.52	$0.54	$1.72	$1.75

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Accumulated other comprehensive earnings reclasifications	$6	$2	$374	$2
Income tax expense from reclassification	$2	$0	$131	$0

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$4,785	$4,850	$15,761	$14,373
Change in fair value of derivative instruments:	'	'	'	'
Change in fair value of derivative instruments for the period	38	-259	2,058	-904
Income tax effect	-13	90	-720	316
Changes from derivative instruments	25	-169	1,338	-588
Change in securities available-for-sale:	'	'	'	'
Unrealized appreciation (depreciation) for the period	-959	2,453	-15,566	4,533
Reclassification adjustment for securities gains realized in income	6	2	374	2
Income tax effect	334	-860	5,318	-1,588
Unrealized gains (losses) on available-for-sale securities	-619	1,595	-9,874	2,947
Other Comprehensive Income (Loss), Net of Tax	-594	1,426	-8,536	2,359
Comprehensive Income	$4,191	$6,276	$7,225	$16,732

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Stockholders' Equity (USD $)	Total	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
In Thousands
Beginning Balances at Dec. 31, 2012	$158,968	$12,500	$31,965	$105,402	$9,101
Net income	15,761	'	'	15,761	'
Other comprehensive income (loss), net of tax	-8,536	'	'	'	-8,536
Amortization of unearned compensation	207	'	207	'	'
Exercise of stock options	34	'	34	'	'
Stock option expense	31	'	31	'	'
Cash dividends on preferred stock (3.29%)	-308	'	'	-308	'
Cash dividends on common stock ($.31 per share)	-2,698	'	'	-2,698	'
Ending Balances at Sep. 30, 2013	$163,459	$12,500	$32,237	$118,157	$565

Condensed_Consolidated_Stateme4

Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013
Cash dividends on preferred stock, rate	3.29%
Cash dividends on common stock, per share	$0.31
Retained Earnings [Member]	'
Cash dividends on preferred stock, rate	3.29%
Cash dividends on common stock, per share	$0.31

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating Activities	'	'
Net income	$15,761	$14,373
Items not requiring (providing) cash	'	'
Provision for loan losses	2,917	1,809
Depreciation and amortization	2,522	1,988
Share based compensation	31	25
Mortgage servicing rights impairment (recovery)	-208	369
Premium amortization on securities available for sale, net	2,221	2,387
Gain on sale of investment securities	-374	-2
Gain on sale of mortgage loans	-7,580	-10,121
Proceeds from sales of loans	306,505	293,909
Loans originated for sale	-289,775	-283,788
Change in cash value of life insurance	-753	-727
(Gain) loss on sale of other real estate owned	-270	-5
Net change in	'	'
Interest receivable	210	-757
Interest payable	-72	-107
Other assets	8,493	217
Other liabilities	326	-2,112
Net cash provided by operating activities	39,954	17,458
Investing Activities	'	'
Purchases of securities available for sale	-152,275	-96,713
Proceeds from sales, maturities, calls, and principal repayments of securities available for sale	103,893	92,734
Purchase of securities held to maturity	-9,910	'
Proceeds from maturities of securities held to maturity	'	4,177
Purchase of Federal Reserve Bank stock	-851	'
Net change in loans	101,796	-66,596
Proceeds on the sale of OREO and repossessed assets	2,138	2,661
Purchases of premises and equipment	-3,033	-4,520
Acquisition of Heartland	'	26,283
Net cash provided by (used in) by investing activities	41,758	-41,974
Net change in	'	'
Deposits	34,167	85,861
Borrowings	-103,142	-38,078
Proceeds from issuance of stock	34	341
Dividends paid on common shares	-2,698	-2,168
Dividends paid on preferred shares	-308	-325
Net cash provided by (used in) financing activities	-71,947	45,631
Net Change in Cash and Cash Equivalent	9,765	21,115
Cash and Cash Equivalents, Beginning of Period	30,735	20,447
Cash and Cash Equivalents, End of Period	40,500	41,562
Additional Cash Flows Information	'	'
Interest paid	10,265	10,882
Income taxes paid	3,100	3,925
Transfer of loans to other real estate owned	$2,528	$3,486

Accounting_Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Accounting Policies	'
	Note 1 – Accounting Policies
	The accompanying condensed consolidated financial statements include the accounts of Horizon Bancorp (“Horizon” or the “Company”) and its wholly-owned subsidiaries, including Horizon Bank, N.A. (“Bank”). All inter-company balances and transactions have been eliminated. The results of operations for the periods ended September 30, 2013 and September 30, 2012 are not necessarily indicative of the operating results for the full year of 2013 or 2012. The accompanying unaudited condensed consolidated financial statements reflect all adjustments that are, in the opinion of Horizon’s management, necessary to fairly present the financial position, results of operations and cash flows of Horizon for the periods presented. Those adjustments consist only of normal recurring adjustments.
	Certain information and note disclosures normally included in Horizon’s annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in Horizon’s Annual Report on Form 10-K for 2012 filed with the Securities and Exchange Commission on March 12, 2013. The consolidated condensed balance sheet of Horizon as of December 31, 2012 has been derived from the audited balance sheet as of that date.
	Basic earnings per share is computed by dividing net income available to common shareholders (net income less dividend requirements for preferred stock and accretion of preferred stock discount) by the weighted-average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. The following table shows computation of basic and diluted earnings per share.
			Three months ended				Nine months ended
			September 30				September 30
			2013		2012		2013		2012
			(Unaudited)		(Unaudited)		(Unaudited)		(Unaudited)
	Basic earnings per share
	Net income		$	4,785	$	4,850	$	15,761	$	14,373
	Less: Preferred stock dividends and accretion of discount			66		63		308		325
	Net income available to common shareholders		$	4,719	$	4,787	$	15,453	$	14,048
	Weighted average common shares outstanding (1)(2)			8,618,969		8,503,475		8,617,972		7,758,537
	Basic earnings per share		$	0.55	$	0.56	$	1.79	$	1.81
	Diluted earnings per share
	Net income available to common shareholders		$	4,719	$	4,787	$	15,453	$	14,048
	Weighted average common shares outstanding (1)(2)			8,618,969		8,503,475		8,617,972		7,758,537
	Effect of dilutive securities:
	Warrants			314,353		269,431		299,704		231,037
	Restricted stock			40,833		30,971		39,883		19,317
	Stock options			45,056		34,782		41,069		26,105
	Weighted average shares outstanding			9,019,211		8,838,659		8,998,628		8,034,996
	Diluted earnings per share		$	0.52	$	0.54	$	1.72	$	1.75
	-1	Adjusted for 3:2 stock split on November 9, 2012
	-2	Includes average shares issued for the Heartland acquisition for the three and nine months ending September 30, 2012
	For the nine months ended September 30, 2013 and 2012, there were no shares and 12,750 shares, respectively, which were not included in the computation of diluted earnings per share because they were non-dilutive.
	Horizon has share-based employee compensation plans, which are described in the notes to the financial statements included in the December 31, 2012 Annual Report on Form 10-K.
	Reclassifications
	Certain reclassifications have been made to the 2012 consolidated financial statements to be comparable to 2013. These reclassifications had no effect on net income.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Acquisition	'
	Note 2 – Acquisition
	On July 17, 2012, Horizon closed its acquisition of Heartland Bancshares, Inc. and Horizon Bank N.A.’s acquisition of Heartland Community Bank, through mergers effective as of that date. Under the final terms of the acquisition, the exchange ratio was 0.81 shares of Horizon’s common stock for each share of Heartland common stock outstanding. Heartland shares outstanding at the closing were 1,442,449, and the shares of Horizon common stock issued to Heartland shareholders totaled 1,168,383. Horizon’s stock price was $16.83 per share at the close of business on July 17, 2012. Based upon these numbers, the total value of the consideration, including the retirement of TARP, for the acquisition was $26.9 million. For the year ended December 31, 2012, the Company had approximately $1.5 million in costs related to the acquisition. These expenses are classified in the non-interest expense section of the income statement primarily located in the salaries and employee benefits, professional services and other expense line items. As a result of the acquisition, the Company has the opportunity to increase its deposit base and reduce transaction costs. The Company also expects to continue reducing costs through economies of scale.
	Under the purchase method of accounting, the total estimated purchase price is allocated to Heartland’s net tangible and intangible assets based on their current estimated fair values on the date of the acquisition. Based on management’s preliminary valuation of the fair value of tangible and intangible assets acquired and liabilities assumed, which are based on estimates and assumptions that are subject to change, the preliminary purchase price for the Heartland acquisition is allocated as follows (in thousands):
	ASSETS
	Cash and due from banks	$	33,531
	Investment securities, available for sale		63,707
	Commercial		70,343
	Residential mortgage		20,838
	Consumer		23,423
	Total loans		114,604
	Premises and equipment		2,647
	FRB and FHLB stock		943
	Goodwill		13,838
	Core deposit intangible		2,332
	Interest receivable		820
	Cash value life insurance		4,012
	Other assets		9,210
	Total assets purchased	$	245,644
	Common shares issued	$	19,668
	Retirement of TARP preferred shares		7,248
	Total estimated purchase price	$	26,916
	LIABILITIES
	Deposits
	Non-interest bearing	$	59,350
	NOW accounts		42,681
	Savings and money market		61,465
	Certificates of deposits		47,749
	Total deposits		211,245
	Borrowings		1,186
	Subordinated debentures		1,537
	Interest payable		90
	Other liabilities		4,670
	Total liabilities assumed	$	218,728
	Of the total estimated purchase price of $26.9 million, $2.3 million has been allocated to core deposit intangible. Additionally, $13.8 million has been allocated to goodwill and $10.8 million of the purchase price is deductible and was assigned to the business assets. The core deposit intangible will be amortized over seven years on a straight line basis.
	The Company acquired loans in the acquisition and the transferred loans had evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected.
	Loans purchased with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit impaired. Evidence of credit quality deterioration as of the purchase date may include information such as past-due and nonaccrual status, borrower credit scores and recent loan-to-value percentages. Purchased credit-impaired loans are accounted for under the accounting guidance for loans and debt securities acquired with deteriorated credit quality (ASC 310-30) and initially measured at fair value, which includes estimated future credit losses expected to be incurred over the life of the loan. Accordingly, an allowance for credit losses related to these loans is not carried over and recorded at the acquisition date. Management estimated the cash flows expected to be collected at acquisition using our internal risk models, which incorporate the estimate of current key assumptions, such as default rates, severity and prepayment speeds.
	The Company acquired the $131.1 million loan portfolio at a fair value discount of $16.5 million. The performing portion of the portfolio, $95.4 million, had an estimated fair value of $91.6 million. The excess of expected cash flows above the fair value of the performing portion of loans will be accreted to interest income over the remaining lives of the loans in accordance with ASC 310-20.
	Preliminary estimates of certain loans, those for which specific credit-related deterioration, since origination, was identified are recorded at fair value, reflecting the present value of the amounts expected to be collected. Income recognition of these loans is based on reasonable expectation about the timing and amount of cash flows to be collected.
	The following table details the acquired loans that are accounted for in accordance with ASC 310-30 (formerly Statement of Position “SOP” 03-3) as of July 17, 2012.
	Contractually required principal and interest at acquisition	$	35,574
	Contractual cash flows not expected to be collected (nonaccretable differences)		5,264
	Expected cash flows at acquisition		30,310
	Interest component of expected cash flows (accretable discount)		7,494
	Fair value of acquired loans accounted for under ASC 310-30	$	22,816
	Pro-forma statements were determined to be impracticable due to the materiality of the transaction.
	The carrying amount of those loans is included in the balance sheet amounts of loans receivable at September 30, 2013. The amounts of loans at September 30, 2013, are as follows:
	Commercial	$	44,717
	Real estate		13,146
	Consumer		12,612
	Outstanding balance	$	70,475
	Carrying amount, net of allowance of $488	$	69,987
	Accretable yield, or income expected to be collected, is as follows:
	Balance at December 31, 2012	$	6,111
	Additions		—
	Accretion		(1,016	)
	Reclassification from nonaccreatable difference		—
	Disposals		(1,629	)
	Balance at September 30, 2013	$	3,466
	During the nine months ended September 30, 2013, the Company increased the allowance for loan losses by a charge to the income statement of $1.6 million. No allowances for loan losses were reversed for the nine months ended 2013.

Securities

Securities	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Securities	'
	Note 3 – Securities
	The fair value of securities is as follows:
	September 30, 2013	Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
	Available for sale
	U.S. Treasury and federal agencies	$	43,161	$	243		$	(647	)	$	42,757
	State and municipal		176,711		5,505			(2,699	)		179,517
	Federal agency collateralized mortgage obligations		111,266		1,293			(1,777	)		110,782
	Federal agency mortgage-backed pools		176,880		3,907			(1,593	)		179,194
	Private labeled mortgage-backed pools		1,290		44			—			1,334
	Corporate notes		532		28			—			560
	Total available for sale investment securities	$	509,840	$	11,020		$	(6,716	)	$	514,144
	Held to maturity, State and Municipal	$	9,910	$	—		$	—		$	9,910
	December 31, 2012	Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
	Available for sale
	U.S. Treasury and federal agencies	$	51,458	$	351		$	(30	)	$	51,779
	State and municipal		162,147		10,842			(84	)		172,905
	Federal agency collateralized mortgage obligations		95,337		1,533			(39	)		96,831
	Federal agency mortgage-backed pools		152,372		6,847			(15	)		159,204
	Private labeled mortgage-backed pools		1,960		71			—			2,031
	Corporate notes		32		19			—			51
	Total available for sale investment securities	$	463,306	$	19,663		$	(168	)	$	482,801
	Based on evaluation of available evidence, including recent changes in market interest rates, credit rating information, and information obtained from regulatory filings, management believes the declines in fair value for these securities are temporary. While these securities are held in the available for sale portfolio, Horizon intends, and has the ability, to hold them until the earlier of a recovery in fair value or maturity.
	Should the impairment of any of these securities become other than temporary, the cost basis of the investment will be reduced and the resulting loss recognized in net income in the period the other-than-temporary impairment is identified. At September 30, 2013, no individual investment security had an unrealized loss that was determined to be other-than-temporary.
	The unrealized losses on the Company’s investments in securities of state and municipal governmental agencies, and federal agency mortgage-backed pools were caused by interest rate volatility and not a decline in credit quality. The contractual terms of those investments do not permit the issuer to settle the securities at a price less than the amortized cost basis of the investments. The Company expects to recover the amortized cost basis over the term of the securities. Because the Company does not intend to sell the investments and it is not likely that the Company will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity, the Company did not consider those investments to be other-than-temporarily impaired at September 30, 2013.
	The amortized cost and fair value of securities available for sale and held to maturity at September 30, 2013 and December 31, 2012, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
		September 30, 2013					December 31, 2012
		Amortized		Fair			Amortized			Fair
		Cost		Value			Cost			Value
	Available for sale
	Within one year	$	3,968	$	3,987		$	4,358		$	4,368
	One to five years		49,167		49,763			49,415			50,673
	Five to ten years		99,931		102,194			98,551			104,258
	After ten years		67,338		66,890			61,313			65,436
			220,404		222,834			213,637			224,735
	Federal agency collateralized mortgage obligations		111,266		110,782			95,337			96,831
	Federal agency mortgage-backed pools		176,880		179,194			152,372			159,204
	Private labeled mortgage-backed pools		1,290		1,334			1,960			2,031
	Total available for sale investment securities	$	509,840	$	514,144		$	463,306		$	482,801
	Held to maturity
	Within one year	$	9,910	$	9,910		$	—		$	—
	One to five years		—		—			—			—
	Total held to maturity investment securities	$	9,910	$	9,910		$	—		$	—
	The following table shows the gross unrealized losses and the fair value of the Company’s investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.
		Less than 12 Months					12 Months or More						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	September 30, 2013	Value		Losses			Value			Losses			Value		Losses
	U.S. Treasury and federal agencies	$	27,836	$	(647	)	$	—		$	—		$	27,836	$	(647	)
	State and municipal		53,822		(2,686	)		1,033			(13	)		54,855		(2,699	)
	Federal agency collateralized mortgage obligations		56,488		(1,645	)		4,499			(132	)		60,987		(1,777	)
	Federal agency mortgage-backed pools		52,517		(1,593	)		—			—			52,517		(1,593	)
	Total temporarily impaired securities	$	190,663	$	(6,571	)	$	5,532		$	(145	)	$	196,195	$	(6,716	)
		Less than 12 Months					12 Months or More						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	December 31, 2012	Value		Losses			Value			Losses			Value		Losses
	U.S. Treasury and federal agencies	$	13,064	$	(30	)	$	—		$	—		$	13,064	$	(30	)
	State and municipal		11,928		(84	)		—			—			11,928		(84	)
	Federal agency collateralized mortgage obligations		12,719		(39	)		—			—			12,719		(39	)
	Federal agency mortgage-backed pools		4,126		(15	)		—			—			4,126		(15	)
	Total temporarily impaired securities	$	41,837	$	(168	)	$	—		$	—		$	41,837	$	(168	)
	Three months ended September 30					Nine months ended September 30
	2013		2012			2013			2012
Sales of securities available for sale (Unaudited)
Proceeds	$	648	$	—		$	23,853		$	—
Gross gains		6		—			382			—
Gross losses		—		—			(8	)		—

Loans

Loans	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Loans	'
	Note 4 – Loans
		September 30			December 31
		2013			2012
	Commercial
	Working capital and equipment	$	239,305		$	198,805
	Real estate, including agriculture		243,262			247,108
	Tax exempt		3,093			4,579
	Other		13,924			9,979
	Total		499,584			460,471
	Real estate
	1-4 family		184,928			185,940
	Other		4,326			3,774
	Total		189,254			189,714
	Consumer
	Auto		137,991			142,149
	Recreation		4,955			5,163
	Real estate/home improvement		31,045			29,989
	Home equity		98,657			104,974
	Unsecured		3,785			4,194
	Other		2,557			2,615
	Total		278,990			289,084
	Mortgage warehouse		113,591			251,448
	Total loans		1,081,419			1,190,717
	Allowance for loan losses		(17,848	)		(18,270	)
	Loans, net	$	1,063,571		$	1,172,447
	Commercial
	Commercial loans are primarily based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected, and the collateral securing these loans may fluctuate in value. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short-term loans may be made on an unsecured basis. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers.
	Commercial real estate loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Commercial real estate lending typically involves larger loan principal amounts and the repayment of these loans is generally dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. The properties securing the Company’s commercial real estate portfolio are diverse in terms of property type, and are monitored for concentrations of credit. Management monitors and evaluates commercial real estate loans based on collateral, cash flow and risk grade criteria. As a general rule, the Company avoids financing single purpose projects unless other underwriting factors are present to help mitigate risk. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner occupied loans.
	Real Estate and Consumer
	With respect to residential loans that are secured by 1-4 family residences and are generally owner occupied, the Company generally establishes a maximum loan-to-value ratio and requires private mortgage insurance if that ratio is exceeded. Home equity loans are typically secured by a subordinate interest in 1-4 family residences, and consumer loans are secured by consumer assets such as automobiles or recreational vehicles. Some consumer loans are unsecured such as small installment loans and certain lines of credit. Repayment of these loans is primarily dependent on the personal income of the borrowers, which can be impacted by economic conditions in their market areas such as unemployment levels. Repayment can also be impacted by changes in property values on residential properties. Risk is mitigated by the fact that the loans are of smaller individual amounts and spread over a large number of borrowers.
	Mortgage Warehousing
	Horizon’s mortgage warehouse lending has specific mortgage companies as customers of Horizon Bank. Individual mortgage loans originated by these mortgage companies are funded as a secured borrowing with a pledge of collateral under Horizon’s agreement with the mortgage company. Each individual mortgage is assigned to Horizon until the loan is sold to the secondary market by the mortgage company. In addition, Horizon takes possession of each original note and forwards such note to the end investor once the mortgage company has sold the loan. At the time a loan is transferred to the secondary market, the mortgage company repurchases the loan under its option within the agreement. Due to the repurchase feature contained in the agreement, the transaction does not qualify as a sale and therefore is accounted for as a secured borrowing with a pledge of collateral pursuant to the agreement with the mortgage company. When the individual loan is sold to the end investor by the mortgage company, the proceeds from the sale of the loan are received by Horizon and used to pay off the loan balance with Horizon along with any accrued interest and any related fees. The remaining balance from the sale is forwarded to the mortgage company. These individual loans typically are sold by the mortgage company within 30 days and are seldom held more than 90 days. Interest income is accrued during this period and collected at the time each loan is sold. Fee income for each loan sold is collected when the loan is sold, and no costs are deferred due to the term between each loan funding and related payoff, which is typically less than 30 days.
	Based on the agreements with each mortgage company, at any time a mortgage company can repurchase from Horizon their outstanding loan balance on an individual mortgage and regain possession of the original note. Horizon also has the option to request that the mortgage company repurchase an individual mortgage. Should this occur, Horizon would return the original note and reassign the assignment of the mortgage to the mortgage company. Also, in the event that the end investor would not be able to honor the purchase commitment and the mortgage company would not be able to repurchase its loan on an individual mortgage, Horizon would be able to exercise its rights under the agreement.
	The following table shows the recorded investment of individual loan categories.
	September 30, 2013	Loan			Interest			Deferred			Recorded
		Balance			Due			Fees / (Costs)			Investment
	Owner occupied real estate	$	153,113		$	226		$	212		$	153,551
	Non owner occupied real estate		229,654			175			430			230,259
	Residential spec homes		242			—			—			242
	Development & spec land loans		15,621			39			43			15,703
	Commercial and industrial		100,194			732			75			101,001
	Total commercial		498,824			1,172			760			500,756
	Residential mortgage		179,964			567			409			180,940
	Residential construction		8,881			17			—			8,898
	Mortgage warehouse		113,591			480			—			114,071
	Total real estate		302,436			1,064			409			303,909
	Direct installment		28,968			92			(278	)		28,782
	Direct installment purchased		331			—			—			331
	Indirect installment		129,450			306			—			129,756
	Home equity		120,222			517			297			121,036
	Total consumer		278,971			915			19			279,905
	Total loans		1,080,231			3,151			1,188			1,084,570
	Allowance for loan losses		(17,848	)		—			—			(17,848	)
	Net loans	$	1,062,383		$	3,151		$	1,188		$	1,066,722
	December 31, 2012	Loan			Interest			Deferred			Recorded
		Balance			Due			Fees / (Costs)			Investment
	Owner occupied real estate	$	162,694		$	503		$	485		$	163,682
	Non owner occupied real estate		201,763			467			276			202,506
	Residential spec homes		1,056			8			—			1,064
	Development & spec land loans		6,963			11			—			6,974
	Commercial and industrial		87,082			380			152			87,614
	Total commercial		459,558			1,369			913			461,840
	Residential mortgage		181,450			565			583			182,598
Residential construction		7,681			13			—			7,694
Mortgage warehouse		251,448			480			—			251,928
Total real estate		440,579			1,058			583			442,220
Direct installment		27,831			115			(204	)		27,742
Direct installment purchased		429			—			—			429
Indirect installment		133,481			370			—			133,851
Home equity		126,588			605			959			128,152
Total consumer		288,329			1,090			755			290,174
Total loans		1,188,466			3,517			2,251			1,194,234
Allowance for loan losses		(18,270	)		—			—			(18,270	)
Net loans	$	1,170,196		$	3,517		$	2,251		$	1,175,964

Allowance_for_Loan_Losses

Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Allowance for Loan Losses	'
	Note 5 – Allowance for Loan Losses
	The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the prior one to five years. Management believes the five-year historical loss experience methodology is appropriate in the current economic environment, as it captures loss rates that are comparable to the current period being analyzed. The actual allowance for loan loss activity is provided below.
		Three Months Ended					Nine Months Ended
		September 30					September 30
		2013			2012		2013		2012
		(Unaudited)			(Unaudited)		(Unaudited)		(Unaudited)
	Balance at beginning of the period	$	18,880		$	18,374	$	18,270	$	18,882
	Loans charged-off:
	Commercial
	Owner occupied real estate		—			92		138		95
	Non owner occupied real estate		539			81		730		109
	Residential development		—			—		—		—
	Development & Spec Land Loans		182			—		182		—
	Commercial and industrial		35			221		948		548
	Total commercial		756			394		1,998		752
	Real estate
	Residential mortgage		43			247		602		451
	Residential construction		—			—		—		—
	Mortgage warehouse		—			—		—		—
	Total real estate		43			247		602		451
	Consumer
	Direct Installment		87			90		282		261
	Direct Installment Purchased		—			—		—		—
	Indirect Installment		329			313		953		922
	Home Equity		306			123		945		1,010
	Total consumer		722			526		2,180		2,193
	Total loans charged-off		1,520			1,167		4,780		3,396
	Recoveries of loans previously charged-off:
	Commercial
	Owner occupied real estate		15			—		61		352
	Non owner occupied real estate		35			—		38		7
	Residential development		—			—		—		—
	Development & Spec Land Loans		—			—		—		—
	Commercial and industrial		101			61		248		114
	Total commercial		151			61		347		473
	Real estate
	Residential mortgage		3			42		11		74
	Residential construction		—			—		—		—
	Mortgage warehouse		—			—		—		—
	Total real estate		3			42		11		74
	Consumer
	Direct Installment		10			28		458		63
	Direct Installment Purchased		—			—		—		—
	Indirect Installment		157			173		529		563
	Home Equity		63			16		95		100
	Total consumer		230			217		1,082		726
	Total loan recoveries		384			320		1,440		1,273
	Net loans charged-off		1,136			847		3,340		2,123
	Provision charged to operating expense
	Commercial		741			625		1,543		320
	Real estate		(381	)		254		606		900
	Consumer		(256	)		162		769		589
	Total provision charged to operating expense		104			1,041		2,917		1,809
	Balance at the end of the period	$	17,848		$	18,568	$	17,848	$	18,568
	Certain loans are individually evaluated for impairment, and the Company’s general practice is to proactively charge down impaired loans to the fair value of the underlying collateral.
	Consistent with regulatory guidance, charge-offs on all loan segments are taken when specific loans, or portions thereof, are considered uncollectible. The Company’s policy is to promptly charge these loans off in the period the uncollectible loss is reasonably determined.
	For all loan portfolio segments except 1-4 family residential properties and consumer, the Company promptly charges-off loans, or portions thereof, when available information confirms that specific loans are uncollectible based on information that includes, but is not limited to, (1) the deteriorating financial condition of the borrower, (2) declining collateral values, and/or (3) legal action, including bankruptcy, that impairs the borrower’s ability to adequately meet its obligations. For impaired loans that are considered to be solely collateral dependent, a partial charge-off is recorded when a loss has been confirmed by an updated appraisal or other appropriate valuation of the collateral.
	The Company charges-off 1-4 family residential and consumer loans, or portions thereof, when the Company reasonably determines the amount of the loss. The Company adheres to timeframes established by applicable regulatory guidance which provides for the charge-down or specific allocation of 1-4 family first and junior lien mortgages to the net realizable value less costs to sell when the value is known but no later than when a loan is 180 days past due. Pursuant to such guidelines, the Company also charges-off unsecured open-end loans when the loan is 90 days past due, and charges down to the net realizable value other secured loans when they are 90 days past due. Loans at these respective delinquency thresholds for which the Company can clearly document that the loan is both well-secured and in the process of collection, such that collection in full will occur regardless of delinquency status, are not charged off.
	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 analysis:
	September 30, 2013	Commercial			Real Estate		Mortgage		Consumer		Total
							Warehousing
	Allowance For Loan Losses
	Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	1,316		$	—	$	—	$	—	$	1,316
Collectively evaluated for impairment		6,347			3,238		1,686		5,261		16,532
Total ending allowance balance	$	7,663		$	3,238	$	1,686	$	5,261	$	17,848
Loans:
Individually evaluated for impairment	$	7,919		$	—	$	—	$	—	$	7,919
Collectively evaluated for impairment		492,837			189,838		114,071		279,905		1,076,651
Total ending loans balance	$	500,756		$	189,838	$	114,071	$	279,905	$	1,084,570
December 31, 2012	Commercial			Real Estate		Mortgage		Consumer		Total
						Warehousing
Allowance For Loan Losses
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	1,945		$	—	$	—	$	—	$	1,945
Collectively evaluated for impairment		5,826			3,204		1,705		5,590		16,325
Total ending allowance balance	$	7,771		$	3,204	$	1,705	$	5,590	$	18,270
Loans:
Individually evaluated for impairment	$	10,597		$	—	$	—	$	—	$	10,597
Collectively evaluated for impairment		451,243			190,292		251,928		290,174		1,183,637
Total ending loans balance	$	461,840		$	190,292	$	251,928	$	290,174	$	1,194,234

Nonperforming_Loans_and_Impair

Non-performing Loans and Impaired Loans	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Non-performing Loans and Impaired Loans	'
	Note 6 – Non-performing Loans and Impaired Loans
	The following table presents the nonaccrual, loans past due over 90 days still on accrual, and troubled debt restructured (“TDRs”) by class of loans:
	September 30, 2013		Nonaccrual			Loans Past			Non Performing			Performing			Total Non-
						Due Over 90			TDR’s			TDR’s			Performing
						Days Still									Loans
						Accruing
	Commercial
	Owner occupied real estate		$	464		$	—		$	82		$	783		$	1,329
	Non owner occupied real estate			2,829			—			825			—			3,654
	Residential development			—			—			—			—			—
	Development & Spec Land Loans			170			—			—			—			170
	Commercial and industrial			1,953			—			781			—			2,734
	Total commercial			5,416			—			1,688			783			7,887
	Real estate
	Residential mortgage			3,436			2			2,693			1,678			7,809
	Residential construction			—			—			284			—			284
	Mortgage warehouse			—			—			—			—			—
	Total real estate			3,436			2			2,977			1,678			8,093
	Consumer
	Direct Installment			249			—			—			—			249
	Direct Installment Purchased			—			—			—			—			—
	Indirect Installment			657			—			—			—			657
	Home Equity			3,228			—			1,321			1,046			5,595
	Total Consumer			4,134			—			1,321			1,046			6,501
	Total		$	12,986		$	2		$	5,986		$	3,507		$	22,481
	December 31, 2012		Nonaccrual			Loans Past			Non Performing			Performing			Total Non-
						Due Over 90			TDR’s			TDR’s			Performing
						Days Still									Loans
						Accruing
	Commercial
	Owner occupied real estate		$	2,800		$	—		$	1,272		$	819		$	4,891
	Non owner occupied real estate			1,705			—			1,605			446			3,756
	Residential development			—			—			—			—			—
	Development & Spec Land Loans			705			—			—			—			705
	Commercial and industrial			544			—			797			—			1,341
	Total commercial			5,754			—			3,674			1,265			10,693
	Real estate
	Residential mortgage			4,565			2			2,536			1,761			8,864
	Residential construction			—			—			291			—			291
	Mortgage warehouse			—			—			—			—			—
	Total real estate			4,565			2			2,827			1,761			9,155
	Consumer
	Direct Installment			138			26			—			—			164
	Direct Installment Purchased			—			—			—			—			—
	Indirect Installment			866			26			—			—			892
	Home Equity			2,051			—			148			676			2,875
	Total Consumer			3,055			52			148			676			3,931
	Total		$	13,374		$	54		$	6,649		$	3,702		$	23,779
	Included in the $13.0 million of non-accrual loans and the $6.0 million of non-performing TDR’s at September 30, 2013 were $1.6 million and $857,000, respectively, of loans acquired for which accretable yield was recognized.
	From time to time, the Bank obtains information that may lead management to believe that the collection of payments may be doubtful on a particular loan. In recognition of this, it is management’s policy to convert the loan from an “earning asset” to a non-accruing loan. The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified due date. Further, it is management’s policy to place a loan on a non-accrual status when the payment is delinquent in excess of 90 days or the loan has had the accrual of interest discontinued by management. The officer responsible for the loan and the Chief Operating Officer or the Senior Vice President of Operations must review all loans placed on non-accrual status. Subsequent payments on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal in accordance with the loan terms. The Company requires a period of satisfactory performance of not less than nine months before returning a nonaccrual loan to accrual status.
	A loan becomes impaired when, based on current information, it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. When a loan is classified as impaired, the degree of impairment must be recognized by estimating future cash flows from the debtor. The present value of these cash flows is computed at a discount rate based on the interest rate contained in the loan agreement. However, if a particular loan has a determinable market value for its collateral, the creditor may use that value. Also, if the loan is secured and considered collateral dependent, the creditor may use the fair value of the collateral. Interest income on loans individually classified as impaired is recognized on a cash basis after all past due and current principal payments have been made.
	Smaller-balance, homogeneous loans are evaluated for impairment in total. Such loans include residential first mortgage loans secured by 1-4 family residences, residential construction loans, automobile, home equity, second mortgage loans and mortgage warehouse loans. Commercial loans and mortgage loans secured by other properties are evaluated individually for impairment. When analysis of borrower operating results and financial condition indicate that underlying cash flows of a borrower’s business are not adequate to meet its debt service requirements, the loan is evaluated for impairment. Often this is associated with a delay or shortfall in payments of 30 days or more. Loans are generally moved to non-accrual status when they are 90 days or more past due. These loans are often considered impaired. Impaired loans, or portions thereof, are charged off when deemed uncollectible.
	Loans for which it is probable that the Company will not collect all principal and interest due according to contractual terms, including TDRs, are measured for impairment. Allowable methods for determining the amount of impairment include estimating fair value using the fair value of the collateral for collateral-dependent loans.
	The Company’s TDRs are considered impaired loans and included in the allowance methodology using the guidance for impaired loans. At September 30, 2013, the type of concessions the Company has made on restructured loans has been temporary rate reductions and/or reductions in monthly payments and there have been no restructured loans with modified recorded balances. Any modification to a loan that is a concession and is not in the normal course of lending is considered a restructured loan. A restructured loan is returned to accruing status after nine consecutive payments but is still reported as TDR unless the loan bears interest at a market rate. As of September 30, 2013, the Company had $9.5 million in TDRs and $3.5 million were performing according to the restructured terms and no TDR’s were returned to accrual status in the first nine months of 2013. There was $440,000 million of specific reserves allocated to TDRs at September 30, 2013 based on the collateral deficiencies.
	Loans transferred and classified as troubled debt restructured loans during the nine months ended September 30, 2013 and 2012, segregated by class, are shown in the table below.
			September 30, 2013						September 30, 2012
			Number			Unpaid			Number			Unpaid
			of			Principal			of			Principal
			Defaults			Balance			Defaults			Balance
	Commercial
	Owner occupied real estate			2		$	81			3		$	1,472
	Non owner occupied real estate			1			68			3			637
	Residential development			—			—			—			—
Development & Spec Land Loans			—			—			—			—
Commercial and industrial			—			—			—			—
Total commercial			3			149			6			2,109
Real estate
Residential mortgage			8			1,132			1			582
Residential construction			—			—			—			—
Mortgage warehouse			—			—			—			—
Total real estate			8			1,132			1			582
Consumer
Direct Installment			—			—			—			—
Direct Installment Purchased			—			—			—			—
Indirect Installment			—			—			—			—
Home Equity			7			1,882			—			—
Total Consumer			7			1,882			—			—
Total			18		$	3,163			7		$	2,691
Troubled debt restructured loans which had payment defaults during the nine months ended September 30, 2013 and 2012, segregated by class, are shown in the table below. Default occurs when a loan is 90 days or more past due or has been transferred to nonaccrual.
		September 30, 2013						September 30, 2012
		Number			Unpaid			Number			Unpaid
		of			Principal			of			Principal
		Defaults			Balance			Defaults			Balance
Commercial
Owner occupied real estate			2		$	81			3		$	1,473
Non owner occupied real estate			1			68			2			261
Residential development			—			—			—			—
Development & Spec Land Loans			—			—			—			—
Commercial and industrial			—			—			—			—
Total commercial			3			149			5			1,734
Real estate
Residential mortgage			4			400			2			677
Residential construction			—			—			—			—
Mortgage warehouse			—			—			—			—
Total real estate			4			400			2			677
Consumer
Direct Installment			—			—			—			—
Direct Installment Purchased			—			—			—			—
Indirect Installment			—			—			—			—
Home Equity			4			1,175			—			—
Total Consumer			4			1,175			—			—
Total			11		$	1,724			7		$	2,411
The following table presents commercial loans individually evaluated for impairment by class of loan:
											Three Months Ending						Nine Months Ending
September 30, 2013		Unpaid			Recorded			Allowance For			Average			Cash/ Accrual			Average		Cash/ Accrual
		Principal			Investment			Loan Loss			Balance in			Interest			Balance in		Interest
		Balance						Allocated			Impaired			Income			Impaired		Income
											Loans			Recognized			Loans		Recognized
With no recorded allowance
Commercial
Owner occupied real estate		$	1,329		$	1,331		$	—		$	1,959			16		$	2,685	$	43
Non owner occupied real estate			3,167			3,170			—			3,814			8			3,298		21
Residential development			—			—			—			—			—			—		—
Development & Spec Land Loans			21			21			—			24			—			25		—
Commercial and industrial			546			561			—			1,297			—			1,311		—
Total commercial			5,063			5,083			—			7,094			24			7,319		64
With an allowance recorded
Commercial
Owner occupied real estate			—			—			—			(1	)		—			—		—
Non owner occupied real estate			487			487			302			491			—			502		—
Residential development			—			—			—			—			—			—		—
Development & Spec Land Loans			149			149			48			173			—			165		—
Commercial and industrial			2,188			2,200			966			2,379			—			1,808		23
Total commercial			2,824			2,836			1,316			3,042			—			2,475		23
Total		$	7,887		$	7,919		$	1,316		$	10,136		$	24		$	9,794	$	87
											Three Months Ending						Nine Months Ending
September 30, 2012		Unpaid			Recorded			Allowance For			Average			Cash/ Accrual			Average		Cash/ Accrual
		Principal			Investment			Loan Loss			Balance in			Interest			Balance in		Interest
		Balance						Allocated			Impaired			Income			Impaired		Income
											Loans			Recognized			Loans		Recognized
With no recorded allowance
Commercial
Owner occupied real estate		$	4,457		$	4,460		$	—		$	3,810		$	—		$	1,978	$	3
Non owner occupied real estate			2,521			2,542			—			2,429			70			1,920		72
Residential development			—			—			—			—			—			—		—
Development & Spec Land Loans			131			131			—			109			—			37		—
Commercial and industrial			456			471			—			382			—			129		—
Total commercial			7,565			7,604			—			6,730			70			4,064		75
With an allowance recorded
Commercial
Owner occupied real estate			903			903			450			910			—			1,109		1
Non owner occupied real estate			2,938			2,938			1,065			2,943			—			2,843		—
Residential development			—			—			—			—			—			—		—
Development & Spec Land Loans			658			658			615			660			—			523		6
Commercial and industrial			801			801			273			801			—			807		—
Total commercial			5,300			5,300			2,403			5,314			—			5,282		7
Total		$	12,865		$	12,904		$	2,403		$	12,044		$	70		$	9,346	$	82
The following table presents the payment status by class of loan:
September 30, 2013		30 - 59 Days			60 - 89 Days			Greater than 90			Total Past Due			Loans Not Past			Total
		Past Due			Past Due			Days Past Due						Due
Commercial
Owner occupied real estate		$	99		$	—		$	—		$	99		$	153,014		$	153,113
Non owner occupied real estate			45			—			—			45			229,609			229,654
Residential development			—			—			—			—			242			242
Development & Spec Land Loans			—			—			—			—			15,621			15,621
Commercial and industrial			13			—			—			13			100,181			100,194
Total commercial			157			—			—			157			498,667			498,824
Real estate
Residential mortgage			695			351			2			1,048			178,916			179,964
Residential construction			—			—			—			—			8,881			8,881
Mortgage warehouse			—			—			—			—			113,591			113,591
Total real estate			695			351			2			1,048			301,388			302,436
Consumer
Direct Installment			122			13			—			135			28,833			28,968
Direct Installment Purchased			—			—			—			—			331			331
Indirect Installment			894			60			—			954			128,496			129,450
Home Equity			173			227			—			400			119,822			120,222
Total consumer			1,189			300			—			1,489			277,482			278,971
Total		$	2,041		$	651		$	2		$	2,694		$	1,077,537		$	1,080,231
Percentage of total loans			0.19	%		0.06	%		0	%		0.25	%		99.75	%
December 31, 2012		30 - 59 Days			60 - 89 Days			Greater than 90			Total Past Due			Loans Not Past			Total
		Past Due			Past Due			Days Past Due						Due
Commercial
Owner occupied real estate		$	2,207		$	19		$	—		$	2,226		$	160,468		$	162,694
Non owner occupied real estate			669			147			—			816			200,947			201,763
Residential development			—			—			—			—			1,056			1,056
Development & Spec Land Loans			—			—			—			—			6,963			6,963
Commercial and industrial			538			16			—			554			86,528			87,082
Total commercial			3,414			182			—			3,596			455,962			459,558
Real estate
Residential mortgage			167			—			2			169			181,281			181,450
Residential construction			—			—			—			—			7,681			7,681
Mortgage warehouse			—			—			—			—			251,448			251,448
Total real estate			167			—			2			169			440,410			440,579
Consumer
Direct Installment			240			64			26			330			27,501			27,831
Direct Installment Purchased			—			—			—			—			429			429
Indirect Installment			1,105			177			26			1,308			132,173			133,481
Home Equity			1,072			321			—			1,393			125,195			126,588
Total consumer			2,417			562			52			3,031			285,298			288,329
Total		$	5,998		$	744		$	54		$	6,796		$	1,181,670		$	1,188,466
Percentage of total loans			0.5	%		0.06	%		0	%		0.57	%		99.43	%
The entire balance of a loan is considered delinquent if the minimum payment contractually required to be made is not received by the specified due date.
Horizon Bank’s processes for determining credit quality differ slightly depending on whether a new loan or a renewed loan is being underwritten, or whether an existing loan is being re-evaluated for credit quality. The latter usually occurs upon receipt of current financial information or other pertinent data that would trigger a change in the loan grade.
•		For new and renewed commercial loans, the Bank’s Credit Department, which acts independently of the loan officer, assigns the credit quality grade to the loan. Loan grades for loans with an aggregate credit exposure of $500,000 or greater are validated by the Loan Committee, which is chaired by the Chief Operating Officer (COO).
•		Commercial loan officers are responsible for reviewing their loan portfolios and report any adverse material change to the COO or Loan Committee. When circumstances warrant a change in the credit quality grade, loan officers are required to notify the COO and the Credit Department of the change in the loan grade. Downgrades are accepted immediately by the COO however, lenders must present their factual information to either the Loan Committee or the COO when recommending an upgrade.
•		The COO or his designee meets weekly with loan officers to discuss the status of past-due loans and classified loans. These meetings are also designed to give the loan officers an opportunity to identify an existing loan that should be downgraded to a classified grade.
•		Monthly, senior management meets with the Watch Committee, which reviews all of the past due, classified, and impaired loans and the relative trends of these assets. This committee also reviews the actions taken with respect to foreclosure mitigation, loan extensions, troubled debt restructures, and collateral repossessions. The information reviewed in this meeting act as a precursor for developing management’s analysis of the adequacy of the Allowance for Loan and Lease Losses.
For real estate and consumer loans, Horizon uses a grading system based on delinquency. Loans that are 90 days or more past due, on non-accrual, or are classified as a TDR are graded “Substandard.” After being 90 days delinquent a loan is charged off unless it is well secured and in the process of collection. If the latter case exists, the loan is placed on non-accrual. Occasionally a mortgage loan may be graded as “Special Mention.” When this situation arises, it is because the characteristics of the loan and the borrower fit the definition of a Risk Grade 5 described below, which is normally used for grading commercial loans. Loans not graded Substandard are considered Pass.
Horizon Bank employs an eight-grade rating system to determine the credit quality of commercial loans. The first four grades represent acceptable quality, and the last four grades mirror the criticized and classified grades used by the bank regulatory agencies (special mention, substandard, doubtful, and loss). The loan grade definitions are detailed below.
Risk Grade 1: Excellent (Pass)
Loans secured by liquid collateral, such as certificates of deposit, reputable bank letters of credit, or other cash equivalents; loans that are guaranteed or otherwise backed by the full faith and credit of the United States government or an agency thereof, such as the Small Business Administration; or loans to any publicly held company with a current long-term debt rating of A or better.
Risk Grade 2: Good (Pass)
Loans to businesses that have strong financial statements containing an unqualified opinion from a CPA firm and at least three consecutive years of profits; loans supported by unaudited financial statements containing strong balance sheets, five consecutive years of profits, a five-year satisfactory relationship with the Bank, and key balance sheet and income statement trends that are either stable or positive; loans secured by publicly traded marketable securities where there is no impediment to liquidation; loans to individuals backed by liquid personal assets and unblemished credit history; or loans to publicly held companies with current long-term debt ratings of Baa or better.
Risk Grade 3: Satisfactory (Pass)
Loans supported by financial statements (audited or unaudited) that indicate average or slightly below average risk and having some deficiency or vulnerability to changing economic conditions; loans with some weakness but offsetting features of other support are readily available; loans that are meeting the terms of repayment, but which may be susceptible to deterioration if adverse factors are encountered.
Loans may be graded Satisfactory when there is no recent information on which to base a current risk evaluation and the following conditions apply:
	•		At inception, the loan was properly underwritten, did not possess an unwarranted level of credit risk, and the loan met the above criteria for a risk grade of Excellent, Good, or Satisfactory;
	•		At inception, the loan was secured with collateral possessing a loan value adequate to protect the Bank from loss.
	•		The loan has exhibited two or more years of satisfactory repayment with a reasonable reduction of the principal balance.
	•		During the period that the loan has been outstanding, there has been no evidence of any credit weakness. Some examples of weakness include slow payment, lack of cooperation by the borrower, breach of loan covenants, or the borrower is in an industry known to be experiencing problems. If any of these credit weaknesses is observed, a lower risk grade may be warranted.
Risk Grade 4: Satisfactory/Monitored (Pass)
Loans in this category are considered to be of acceptable credit quality, but contain greater credit risk than Satisfactory loans due to weak balance sheets, marginal earnings or cash flow, lack of financial information, weakening markets, insufficient or questionable collateral coverage or other uncertainties. These loans warrant a higher than average level of monitoring to ensure that weaknesses do not advance. The level of risk in a Satisfactory/Monitored loan is within acceptable underwriting guidelines so long as the loan is given the proper level of management supervision. Loans that normally fall into this grade include construction of commercial real estate buildings, land development and subdivisions, and rental properties that have not attained stabilization.
Risk Grade 5: Special Mention
Loans which possess some credit deficiency or potential weakness which deserves close attention. Such loans pose an unwarranted financial risk that, if not corrected, could weaken the loan by adversely impacting the future repayment ability of the borrower. The key distinctions of a Special Mention classification are that (1) it is indicative of an unwarranted level of risk and (2) weaknesses are considered “potential,” not “defined,” impairments to the primary source of repayment. These loans may be to borrowers with adverse trends in financial performance, collateral value and/or marketability, or balance sheet strength.
Risk Grade 6: Substandard
One or more of the following characteristics may be exhibited in loans classified Substandard:
	•		Loans which possess a defined credit weakness. The likelihood that a loan will be paid from the primary source of repayment is uncertain. Financial deterioration is under way and very close attention is warranted to ensure that the loan is collected without loss.
	•		Loans are inadequately protected by the current net worth and paying capacity of the obligor.
	•		The primary source of repayment is gone, and the Bank is forced to rely on a secondary source of repayment, such as collateral liquidation or guarantees.
	•		Loans have a distinct possibility that the Bank will sustain some loss if deficiencies are not corrected.
	•		Unusual courses of action are needed to maintain a high probability of repayment.
	•		The borrower is not generating enough cash flow to repay loan principal; however, it continues to make interest payments.
	•		The lender is forced into a subordinated or unsecured position due to flaws in documentation.
	•		Loans have been restructured so that payment schedules, terms, and collateral represent concessions to the borrower when compared to the normal loan terms.
	•		The lender is seriously contemplating foreclosure or legal action due to the apparent deterioration in the loan.
	•		There is a significant deterioration in market conditions to which the borrower is highly vulnerable.
Risk Grade 7: Doubtful
One or more of the following characteristics may be present in loans classified Doubtful:
	•		Loans have all of the weaknesses of those classified as Substandard. However, based on existing conditions, these weaknesses make full collection of principal highly improbable.
	•		The primary source of repayment is gone, and there is considerable doubt as to the quality of the secondary source of repayment.
	•		The possibility of loss is high but because of certain important pending factors which may strengthen the loan, loss classification is deferred until the exact status of repayment is known.
Risk Grade 8: Loss
Loans are considered uncollectible and of such little value that continuing to carry them as assets is not feasible. Loans will be classified Loss when it is neither practical nor desirable to defer writing off or reserving all or a portion of a basically worthless asset, even though partial recovery may be possible at some time in the future.
The following table presents loans by credit grades.
September 30, 2013		Pass			Special			Substandard			Doubtful			Total
					Mention
Commercial
Owner occupied real estate		$	142,836		$	2,600		$	7,677		$	—		$	153,113
Non owner occupied real estate			210,632			3,119			15,903			—			229,654
Residential development			242			—			—			—			242
Development & Spec Land Loans			13,844			94			1,683			—			15,621
Commercial and industrial			90,221			5,410			4,563			—			100,194
Total commercial			457,775			11,223			29,826			—			498,824
Real estate
Residential mortgage			172,155			—			7,809			—			179,964
Residential construction			8,597			—			284			—			8,881
Mortgage warehouse			113,591			—			—			—			113,591
Total real estate			294,343			—			8,093			—			302,436
Consumer
Direct Installment			28,719			—			249			—			28,968
Direct Installment Purchased			331			—			—			—			331
Indirect Installment			128,793			—			657			—			129,450
Home Equity			114,627			—			5,595			—			120,222
Total Consumer			272,470			—			6,501			—			278,971
Total		$	1,024,587		$	11,223		$	44,420		$	—		$	1,080,231
Percentage of total loans			94.85	%		1.04	%		4.11	%		0	%
December 31, 2012		Pass			Special			Substandard			Doubtful			Total
					Mention
Commercial
Owner occupied real estate		$	137,664		$	6,407		$	17,029		$	1,594		$	162,694
Non owner occupied real estate			171,319			19,440			10,717			287			201,763
Residential development			405			—			651			—			1,056
Development & Spec Land Loans			3,171			178			3,614			—			6,963
Commercial and industrial			78,810			3,136			5,136			—			87,082
Total commercial			391,369			29,161			37,147			1,881			459,558
Real estate
Residential mortgage			172,586			—			8,864			—			181,450
Residential construction			7,390			—			291			—			7,681
Mortgage warehouse			251,448			—			—			—			251,448
Total real estate			431,424			—			9,155			—			440,579
Consumer
Direct Installment			27,667			—			164			—			27,831
Direct Installment Purchased			429			—			—			—			429
Indirect Installment			132,589			—			892			—			133,481
Home Equity			123,713			—			2,875			—			126,588
Total Consumer			284,398			—			3,931			—			288,329
Total		$	1,107,191		$	29,161		$	50,233		$	1,881		$	1,188,466
Percentage of total loans			93.16	%		2.45	%		4.23	%		0.16	%

Derivative_financial_instrumen

Derivative financial instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative financial instruments	'
	Note 7 – Derivative financial instruments
	Cash Flow Hedges
	As a strategy to maintain acceptable levels of exposure to the risk of changes in future cash flow due to interest rate fluctuations, the Company entered into interest rate swap agreements for a portion of its floating rate debt. The agreements provide for the Company to receive interest from the counterparty at three month LIBOR and to pay interest to the counterparty at a weighted average fixed rate of 6.14% on a notional amount of $30.5 million at September 30, 2013 and December 31, 2012. Under the agreements, the Company pays or receives the net interest amount monthly, with the monthly settlements included in interest expense.
	Management has designated the interest rate swap agreement as a cash flow hedging instrument. For derivative instruments that are designated and qualify as a cash flow hedge, the effective portion of the gain or loss on the derivative is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings. At September 30, 2013 the Company’s cash flow hedge was effective and is not expected to have a significant impact on the Company’s net income over the next 12 months.
	Fair Value Hedges
	Fair value hedges are intended to reduce the interest rate risk associated with the underlying hedged item. The Company enters into fixed rate loan agreements as part of its lending policy. To mitigate the risk of changes in fair value based on fluctuations in interest rates, the Company has entered into interest rate swap agreements on individual loans, converting the fixed rate loans to a variable rate. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in current earnings. At September 30, 2013 the Company’s fair value hedges were effective and are not expected to have a significant impact on the Company’s net income over the next 12 months.
	The change in fair value of both the hedge instruments and the underlying loan agreements are recorded as gains or losses in interest income. The fair value hedges are considered to be highly effective and any hedge ineffectiveness was deemed not material. The notional amounts of the loan agreements being hedged were $90.3 million at September 30, 2013 and $81.0 million at December 31, 2012.
	Other Derivative Instruments
	The Company enters into non-hedging derivatives in the form of mortgage loan forward sale commitments with investors and commitments to originate mortgage loans as part of its mortgage banking business. At September 30, 2013, the Company’s fair value of these derivatives were recorded and over the next 12 months are not expected to have a significant impact on the Company’s net income.
	The change in fair value of both the forward sale commitments and commitments to originate mortgage loans were recorded and the net gains or losses included in the Company’s gain on sale of loans.
	The following tables summarize the fair value of derivative financial instruments utilized by Horizon Bancorp:
		Asset Derivative						Liability Derivatives
		September 30, 2013						September 30, 2013
		Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments (Unaudited)
	Interest rate contracts	Loans		$	23			Other liabilities		$	579
	Interest rate contracts	Other Assets			556			Other liabilities			3,435
	Total derivatives designated as hedging instruments				579						4,014
	Derivatives not designated as hedging instruments
	Mortgage loan contracts	Other assets			619			Other liabilities			—
	Total derivatives not designated as hedging instruments				619						—
	Total derivatives			$	1,198					$	4,014
		Asset Derivative						Liability Derivatives
		December 31, 2012						December 31, 2012
		Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments (Unaudited)
	Interest rate contracts	Loans		$	279			Other liabilities		$	2,214
	Interest rate contracts	Other Assets			1,935			Other liabilities			5,493
	Total derivatives designated as hedging instruments				2,214						7,707
	Derivatives not designated as hedging instruments
	Mortgage loan contracts	Other assets			858			Other liabilities			—
	Total derivatives not designated as hedging instruments				858						—
	Total derivatives			$	3,072					$	7,707
	The effect of the derivative instruments on the condensed consolidated statement of income for the three and nine month periods ending 2013 and 2012 is as follows:
		Comprehensive Income on Derivative								Comprehensive Income on Derivative
		(Effective Portion)								(Effective Portion)
		Three Months Ended September 30								Nine Months Ended September 30
	Derivative in cash flow hedging relationship	2013				2012				2013				2012
		(Unaudited)				(Unaudited)				(Unaudited)				(Unaudited)
	Interest rate contracts	$	25			$	(169	)		$	1,338			$	(588	)
	FASB Accounting Standards Codification (“ASC”) Topic 820-10-20 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Topic 820-10-55 establishes a fair value hierarchy that emphasizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value.
				Amount of Gain (Loss) Recognized								Amount of Gain (Loss) Recognized
				on Derivative								on Derivative
				Three Months Ended September 30								Nine Months Ended September 30
	Derivative in fair value hedging	Location of gain (loss)		2013				2012				2013				2012
	relationship	recognized on derivative		(Unaudited)				(Unaudited)				(Unaudited)				(Unaudited)
	Interest rate contracts	Interest income - loans		$	211			$	112			$	(1,635	)		$	336
	Interest rate contracts	Interest income - loans			(211	)			(112	)			1,635				(336	)
	Total			$	—			$	—			$	—			$	—
				Amount of Gain (Loss) Recognized								Amount of Gain (Loss) Recognized
				on Derivative								on Derivative
				Three Months Ended September 30								Nine Months Ended September 30
	Derivative not designated as	Location of gain (loss)		2013				2012				2013				2012
	hedging relationship	recognized on derivative		(Unaudited)				(Unaudited)				(Unaudited)				(Unaudited)
	Mortgage contracts	Other income - gain on sale of loans		$	169			$	320			$	(239	)		$	600

Disclosures_about_fair_value_o

Disclosures about fair value of assets and liabilities	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Disclosures about fair value of assets and liabilities	'
	Note 8 – Disclosures about fair value of assets and liabilities
	The Fair Value Measurements topic of the FASB ASC defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. There are three levels of inputs that may be used to measure fair value:
	Level 1	Quoted prices in active markets for identical assets or liabilities
	Level 2	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 for substantially the full term of the assets or liabilities
	Level 3	Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities
	Following is a description of the valuation methodologies used for instruments measured at fair value on a recurring basis and recognized in the accompanying condensed consolidated financial statements, as well as the general classification of such instruments pursuant to the valuation hierarchy. There have been no significant changes in the valuation techniques during the period ended September 30, 2013. For assets classified within Level 3 of the fair value hierarchy, the process used to develop the reported fair value is described below.
	Available for sale securities
	When quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. If quoted market prices are not available, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows. Level 2 securities include U.S. Treasury and federal agency securities, state and municipal securities, federal agency mortgage obligations and mortgage-backed pools, private-label mortgage-backed pools and corporate notes. Level 2 securities are valued by a third party pricing service commonly used in the banking industry utilizing observable inputs. Observable inputs include dealer quotes, market spreads, cash flow analysis, the U.S. Treasury yield curve, trade execution data, market consensus prepayment spreads and available credit information and the bond’s terms and conditions. The pricing provider utilizes evaluated pricing models that vary based on asset class. These models incorporate available market information including quoted prices of securities with similar characteristics and, because many fixed-income securities do not trade on a daily basis, apply available information through processes such as benchmark curves, benchmarking of like securities, sector grouping, and matrix pricing. In addition, model processes, such as an option adjusted spread model is used to develop prepayment and interest rate scenarios for securities with prepayment features.
	Hedged loans
	Certain fixed rate loans have been converted to variable rate loans by entering into interest rate swap agreements. The fair value of those fixed rate loans is based on discounting the estimated cash flows using interest rates determined by the respective interest rate swap agreement. Loans are classified within Level 2 of the valuation hierarchy based on the unobservable inputs used.
	Interest rate swap agreements
	The fair value of the Company’s interest rate swap agreements is estimated by a third party using inputs that are primarily unobservable including a yield curve, adjusted for liquidity and credit risk, contracted terms and discounted cash flow analysis, therefore, are classified within Level 2 of the valuation hierarchy.
	The following table presents the fair value measurements of assets and liabilities recognized in the accompanying financial statements measured at fair value on a recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at the following:
		Fair Value			Quoted Prices in			Significant			Significant
					Active Markets			Other			Unobservable
					for Identical			Observable			Inputs
					Assets			Inputs			(Level 3)
					(Level 1)			(Level 2)
	September 30, 2013
	Available-for-sale securities
	U.S. Treasury and federal agencies	$	42,757		$	—		$	42,757		$	—
	State and municipal		179,517			—			179,517			—
	Federal agency collateralized mortgage obligations		110,782			—			110,782			—
	Federal agency mortgage-backed pools		179,194			—			179,194			—
	Private labeled mortgage-backed pools		1,334			—			1,334			—
	Corporate notes		560			—			560			—
	Total available-for-sale securities		514,144			—			514,144			—
	Hedged loans		89,718			—			89,718			—
	Forward sale commitments		619			—			619			—
	Interest rate swap agreements		(4,014	)		—			(4,014	)		—
	Commitments to originate loans		—			—			—			—
	December 31, 2012
	Available-for-sale securities
	U.S. Treasury and federal agencies	$	51,779		$	—		$	51,779		$	—
	State and municipal		172,905			—			172,905			—
	Federal agency collateralized mortgage obligations		96,831			—			96,831			—
	Federal agency mortgage-backed pools		159,204			—			159,204			—
	Private labeled mortgage-backed pools		2,031			—			2,031			—
	Corporate notes		51			—			51			—
	Total available-for-sale securities		482,801			—			482,801			—
	Hedged loans		81,018			—			81,018			—
	Forward sale commitments		858			—			858			—
	Interest rate swap agreements		(7,707	)		—			(7,707	)		—
	Commitments to originate loans		—			—			—			—
	Transfers between levels
	Transfers between Levels 1, 2 and 3 and the reasons for those transfers are as follows:
	December 31, 2012	Quoted Prices			Significant			Significant			Reason
		in Active			Other			Unobservable			for
		Markets for			Observable			Inputs			Transfer
		Identical			Inputs			(Level 3)
		Assets			(Level 2)
		(Level 1)
	Transfers to level:
	Hedged loans	$	—		$	59,911		$	—				(a)
	Forward sale commitments		—			510			—				(b)
	Interest rate swap agreements		—			(6,464	)		—				(a)
	Commitments to originate loans		—			(71	)		—				(b)
	Total transfers to level	$	—		$	53,886		$	—
	(a)	-		Valuation determined by widely accepted techniques including discounted cash flow analysis on expected cash flows of each derivative and observable market rate inputs such as yield curves and contractual terms on each instrument.
	(b)	-		Valuation determined by quoted prices for similar loans in the secondary market with an expected fallout rate (interest rate locked pipeline loans not expected to close). Fallout rate is not considered a significant input to the fair value in its entirety.
	The following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs:
		Hedged Loans			Forward Sale			Interest Rate			Commitments to
					Commitments			Swaps			Originate Loans
Beginning balance December 31, 2011	$	54,362		$	662		$	(7,101	)	$	—
Total realized and unrealized gains and losses
Included in net income		(74	)		(152	)		74			(71	)
Included in other comprehensive income, gross		—			—			563			—
Purchases, issuances, and settlements		6,114			—			—			—
Principal payments		(491	)		—			—			—
Transfers out to Level 2		(59,911	)		(510	)		6,464			71
Ending balance December 31, 2012	$	—		$	—		$	—		$	—
Realized gains and losses included in net income for the periods are reported in the condensed consolidated statements of income as follows:
	Three Months Ended September 30						Nine Months Ended September 30
	2013			2012			2013			2012
Non Interest Income	(Unaudited)			(Unaudited)			(Unaudited)			(Unaudited)
Total gains and losses from:
Hedged loans	$	211		$	112		$	(1,635	)	$	336
Fair value interest rate swap agreements		(211	)		(112	)		1,635			(336	)
Derivative loan commitments		169			320			(239	)		600
	$	169		$	320		$	(239	)	$	600
Certain other assets are measured at fair value on a nonrecurring basis in the ordinary course of business and are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment):
	Fair Value			Quoted Prices in			Significant Other			Significant
				Active Markets for			Observable			Unobservable
				Identical Assets			Inputs			Inputs
				(Level 1)			(Level 2)			(Level 3)
September 30, 2013
Impaired loans	$	6,571		$	—		$	—		$	6,571
Mortgage servicing rights		6,302			—			—			6,302
December 31, 2012
Impaired loans	$	8,652		$	—		$	—		$	8,652
Mortgage servicing rights		5,145			—			—			5,145
Impaired (collateral dependent): Loans for which it is probable that the Company will not collect all principal and interest due according to contractual terms are measured for impairment. Allowable methods for determining the amount of impairment include estimating fair value using the fair value of the collateral for collateral-dependent loans.
If the impaired loan is identified as collateral dependent, then the fair value method of measuring the amount of impairment is utilized. This method requires obtaining a current independent appraisal of the collateral and applying a discount factor to the value.
Impaired loans that are collateral dependent are classified within Level 3 of the fair value hierarchy when impairment is determined using the fair value method. Fair value adjustments on impaired loans were $1.3 million at September 30, 2013 and $1.9 million at December 31, 2012.
Mortgage Servicing Rights (MSRs): MSRs do not trade in an active market with readily observable prices. Accordingly, the fair value of these assets is classified as Level 3. The Company determines the fair value of MSRs using an income approach model based upon the Company’s month-end interest rate curve and prepayment assumptions. The model utilizes assumptions to estimate future net servicing income cash flows, including estimates of time decay, payoffs and changes in valuation inputs and assumptions. The Company reviews the valuation assumptions against this market data for reasonableness and adjusts the assumptions if deemed appropriate. The carrying amount of the MSR’s fair value increased by $208,000 during the first nine months of 2013 and decreased by $369,000 during the first nine months of 2012.
The following table presents qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill.
	Fair Value at			Valuation		Unobservable Inputs	Range (Weighted
	September 30, 2013			Technique			Average)
Impaired loans	$	6,571		Collateral based		Discount to reflect current market	10% - 15%(12%)
				measurement		conditions and ultimate
						collectability
Mortgage servicing rights	$	6,302		Discounted		Discount rate, Constant	10% - 15%(12%),
				cashflows		prepayment rate, Probably of	4% - 7%(4.6%),
						default	1% - 10%(4.5%)
	Fair Value at			Valuation		Unobservable Inputs	Range (Weighted
	December 31, 2012			Technique			Average)
Impaired loans	$	8,652		Collateral based		Discount to reflect current market	10% - 15%(12%)
				measurement		conditions and ultimate
						collectability
Mortgage servicing rights	$	5,145		Discounted		Discount rate, Constant	10% - 15%(12%),
				cashflows		prepayment rate, Probably of	4% - 7%(4.6%),
						default	1% - 10%(4.5%)

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Note 9 – Fair Value of Financial Instruments
	The estimated fair value amounts of the Company’s financial instruments were determined using available market information, current pricing information applicable to Horizon and various valuation methodologies. Where market quotations were not available, considerable management judgment was involved in the determination of estimated fair values. Therefore, the estimated fair value of financial instruments shown below may not be representative of the amounts at which they could be exchanged in a current or future transaction. Due to the inherent uncertainties of expected cash flows of financial instruments, the use of alternate valuation assumptions and methods could have a significant effect on the estimated fair value amounts.
	The estimated fair values of financial instruments, as shown below, are not intended to reflect the estimated liquidation or market value of Horizon taken as a whole. The disclosed fair value estimates are limited to Horizon’s significant financial instruments at September 30, 2013 and December 31, 2012. These include financial instruments recognized as assets and liabilities on the consolidated balance sheet as well as certain off-balance sheet financial instruments. The estimated fair values shown below do not include any valuation of assets and liabilities, which are not financial instruments as defined by the FASB ASC fair value hierarchy.
	The following methods and assumptions were used to estimate the fair value of each class of financial instrument:
	Cash and Due from Banks — The carrying amounts approximate fair value.
	Held-to-Maturity Securities — For debt securities held to maturity, fair values are based on quoted market prices or dealer quotes. For those securities where a quoted market price is not available, carrying amount is a reasonable estimate of fair value based upon comparison with similar securities.
	Loans Held for Sale — The carrying amounts approximate fair value.
	Net Loans — The fair value of portfolio loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. The carrying amounts of loans held for sale approximate fair value.
	FHLB and FRB Stock — Fair value of FHLB and FRB stock is based on the price at which it may be resold to the FHLB and FRB.
	Interest Receivable/Payable — The carrying amounts approximate fair value.
	Deposits — The fair value of demand deposits, savings accounts, interest-bearing checking accounts and money market deposits is the amount payable on demand at the reporting date. The fair value of fixed maturity certificates of deposit is estimated by discounting the future cash flows using rates currently offered for deposits of similar remaining maturity.
	Borrowings — Rates currently available to Horizon for debt with similar terms and remaining maturities are used to estimate fair values of existing borrowings.
	Subordinated Debentures — Rates currently available for debentures with similar terms and remaining maturities are used to estimate fair values of existing debentures.
	Commitments to Extend Credit and Standby Letter of Credit — The fair value of commitments is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of letters of credit is based on fees currently charged for similar agreements or on the estimated cost to terminate them or otherwise settle the obligations with the counterparties at the reporting date. Due to the short-term nature of these agreements, carrying amounts approximate fair value.
	The following table presents estimated fair values of the Company’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall (unaudited).
		September 30, 2013
		Carrying		Quoted Prices		Significant		Significant
		Amount		in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets
	Cash and due from banks	$	40,500	$	40,500	$	—	$	—
	Investment securities, held to maturity		9,910		—		—		9,910
	Loans held for sale		4,594		—		—		4,594
	Loans excluding loan level hedges, net		973,300		—		—		996,408
	Stock in FHLB and FRB		14,184		—		14,184		—
	Interest receivable		7,506		—		7,506		—
	Liabilities
	Non-interest bearing deposits	$	223,354	$	223,354	$	—	$	—
	Interest-bearing deposits		1,104,966		—		1,060,853		—
	Borrowings		242,505		—		245,043		—
	Subordinated debentures		32,448		—		32,483		—
	Interest payable		488		—		488		—
		December 31, 2012
		Carrying		Quoted Prices		Significant		Significant
		Amount		in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets
	Cash and due from banks	$	30,735	$	30,735	$	—	$	—
	Loans held for sale		13,744		—		—		13,744
	Loans excluding loan level hedges, net		1,089,215		—		—		1,118,255
	Stock in FHLB and FRB		13,333		—		13,333		—
	Interest receivable		7,716		—		7,716		—
	Liabilities
	Non-interest bearing deposits	$	209,200	$	209,200	$	—	$	—
	Interest-bearing deposits		1,084,953		—		1,092,184		—
	Borrowings		345,764		—		352,891		—
	Subordinated debentures		32,331		—		32,268		—
	Interest payable		560		—		560		—

Other_Comprehensive_Income

Other Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Other Comprehensive Income	'
	Note 10 – Other Comprehensive Income
			Accumulated Other Comprehensive Income (1)
	Unaudited		Unrealized			Unrealized			Total
			Gains (Losses) on			Gains (Losses)
			Securities			on Derivative
			Available-for-Sale			Instruments
	Balance at December 31, 2012		$	12,671		$	(3,570	)	$	9,101
	Other comprehensive income (loss) before reclassifications			(9,631	)		1,338			(8,293	)
	Amounts reclassified from other comprehensive income			(243	)		—			(243	)
	Period change			(9,874	)		1,338			(8,536	)
	Balance at September 30, 2013		$	2,797		$	(2,232	)	$	565
	Balance at December 31, 2011		$	11,036		$	(3,194	)	$	7,842
	Other comprehensive income (loss) before reclassifications			2,947			(588	)		2,359
	Amounts reclassified from other comprehensive income			—			—			—
	Period change			2,947			(588	)		2,359
	Balance at September 30, 2012		$	13,983		$	(3,782	)	$	10,201
	(1)	All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 35%.
			Amount Reclassified from
	Details About Accumulated Other Comprehensive Income Components		Accumulated Other Comprehensive						Affected Line Items in the
			Income For the Three						Statement of Net Income
			Months Ended September 30,
	Unaudited		2013			2012
	Securities available-for-sale (1)
	Net securities gains reclassified into earnings		$	6		$	—		Gain on sale of investment securities
	Related income tax expense			(2	)		—		Income tax expense
	Net effect on accumulated other comprehensive income for the period			4			—		Net of tax
	Total reclassifications for the period		$	4		$	—		Net of tax
	(1)	For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income see Note 3, “Securities”
	Details About Accumulated Other Comprehensive Income Components		Amount Reclassified from						Affected Line Items in the
			Accumulated Other Comprehensive						Statement of Net Income
			Income For the Nine
			Months Ended  September 30,
	Unaudited		2013			2012
	Securities available-for-sale (1)
	Net securities gains reclassified into earnings		$	374		$	—		Gain on sale of investment securities
	Related income tax expense			(131	)		—		Income tax expense
	Net effect on accumulated other comprehensive income for the period			243			—		Net of tax
	Total reclassifications for the period		$	243		$	—		Net of tax
	(1)	For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income see Note 3, “Securities”

Future_accounting_matters

Future accounting matters	9 Months Ended
	Sep. 30, 2013
Accounting Changes And Error Corrections [Abstract]	'
Future accounting matters	'
	Note 11 – Future accounting matters
	Accounting Standards Update No. 2013-04 — Liabilities (Topic 405) — On February 28, 2013, FASB issued ASU 2013-04. The amendments in this Update provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this Update is fixed at the reporting date, except for obligations addressed within existing guidance in U.S. GAAP. The guidance requires an entity to measure those obligations as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and any additional amount the reporting entity expects to pay on behalf of its co-obligors.
	The guidance in this Update also requires an entity to disclose the nature and amount of the obligation as well as other information about those obligations. This Accounting Standards Update is the final version of Proposed Accounting Standards Update EITF12D — Liabilities (Topic 405) which has been deleted.
	The amendments in this Update are effective for fiscal years beginning after December 31, 2013. Early adoption is permitted. The Company will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.
	Accounting Standards Update No. 2013-07 — Presentation of Financial Statements (Topic 205) — On April 22, 2013, FASB issued ASU 2013-07. The objective of this Update is to clarify when an entity should apply the liquidation basis of accounting and to provide principles for the measurement of assets and liabilities under the liquidation basis of accounting, as well as any required disclosures. This Accounting Standards Update is the final version of Proposed Accounting Standards Update 2012-210 — Presentation of Financial Statements (Topic 205), which has been deleted.
	The amendments are effective for entities that determine liquidation is imminent during annual reporting periods beginning after December 15, 2013, and interim reporting periods therein. Entities should apply the requirements prospectively from the day that liquidation becomes imminent. Early adoption is permitted. The Company will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.
	Accounting Standards Update No. 2013-10 — Derivatives and Hedging (Topic 815) — In July 2013, FASB issued ASU 2013-10. The objective of this Update is to provide for the inclusion of the Fed Funds Effective Swap Rate — Overnight Index Swap Rate (OIS) as a U.S. benchmark interest rate for hedge accounting purposes, in addition to U.S. Treasury (UST) or London Interbank Offered Rate (LIBOR) indices. The Update also removes a restriction stating that entities must use the same rates for similar hedges, offering greater flexibility in hedge accounting.
	The amendments in this Update are effective prospectively for qualifying new or re-designated hedging relationships entered into on or after July 17, 2013. The Company has adopted the applicable methodologies prescribed by this ASU and does not anticipate that the ASU will have a material effect on its financial position or results of operations.
	Accounting Standards Update No. 2013-11 — Income Taxes (Topic 740) — In July 2013, FASB issued ASU 2013-11. This update pertains to the unrecognized tax benefit when a net operating loss carry forward, a similar tax loss or a tax credit carry forward exists. The ASU is intended to end the varying ways that entities present these situations since GAAP is non-specific and leads to diversity in practice. The new standard deems that any unrecognized tax benefit or portion of an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carry forward, a similar tax loss, or a tax credit carry forward except for certain defined situations.
	The amendments in this Update are effective for fiscal years beginning after December 15, 2013. Early adoption is permitted. The Company will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.

Accounting_Policies_Policies

Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Changes And Error Corrections [Abstract]	'
Reclassifications	'
	Reclassifications
	Certain reclassifications have been made to the 2012 consolidated financial statements to be comparable to 2013. These reclassifications had no effect on net income.
Liabilities	'
	Accounting Standards Update No. 2013-04 — Liabilities (Topic 405) — On February 28, 2013, FASB issued ASU 2013-04. The amendments in this Update provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this Update is fixed at the reporting date, except for obligations addressed within existing guidance in U.S. GAAP. The guidance requires an entity to measure those obligations as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and any additional amount the reporting entity expects to pay on behalf of its co-obligors.
	The guidance in this Update also requires an entity to disclose the nature and amount of the obligation as well as other information about those obligations. This Accounting Standards Update is the final version of Proposed Accounting Standards Update EITF12D — Liabilities (Topic 405) which has been deleted.
	The amendments in this Update are effective for fiscal years beginning after December 31, 2013. Early adoption is permitted. The Company will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.
Presentation of Financial Statements	'
	Accounting Standards Update No. 2013-07 — Presentation of Financial Statements (Topic 205) — On April 22, 2013, FASB issued ASU 2013-07. The objective of this Update is to clarify when an entity should apply the liquidation basis of accounting and to provide principles for the measurement of assets and liabilities under the liquidation basis of accounting, as well as any required disclosures. This Accounting Standards Update is the final version of Proposed Accounting Standards Update 2012-210 — Presentation of Financial Statements (Topic 205), which has been deleted.
	The amendments are effective for entities that determine liquidation is imminent during annual reporting periods beginning after December 15, 2013, and interim reporting periods therein. Entities should apply the requirements prospectively from the day that liquidation becomes imminent. Early adoption is permitted. The Company will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.
Derivatives and Hedging	'
	Accounting Standards Update No. 2013-10 — Derivatives and Hedging (Topic 815) — In July 2013, FASB issued ASU 2013-10. The objective of this Update is to provide for the inclusion of the Fed Funds Effective Swap Rate — Overnight Index Swap Rate (OIS) as a U.S. benchmark interest rate for hedge accounting purposes, in addition to U.S. Treasury (UST) or London Interbank Offered Rate (LIBOR) indices. The Update also removes a restriction stating that entities must use the same rates for similar hedges, offering greater flexibility in hedge accounting.
	The amendments in this Update are effective prospectively for qualifying new or re-designated hedging relationships entered into on or after July 17, 2013. The Company has adopted the applicable methodologies prescribed by this ASU and does not anticipate that the ASU will have a material effect on its financial position or results of operations.
Income Taxes	'
	Accounting Standards Update No. 2013-11 — Income Taxes (Topic 740) — In July 2013, FASB issued ASU 2013-11. This update pertains to the unrecognized tax benefit when a net operating loss carry forward, a similar tax loss or a tax credit carry forward exists. The ASU is intended to end the varying ways that entities present these situations since GAAP is non-specific and leads to diversity in practice. The new standard deems that any unrecognized tax benefit or portion of an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carry forward, a similar tax loss, or a tax credit carry forward except for certain defined situations.
	The amendments in this Update are effective for fiscal years beginning after December 15, 2013. Early adoption is permitted. The Company will adopt the methodologies prescribed by this ASU by the date required, and does not anticipate that the ASU will have a material effect on its financial position or results of operations.

Accounting_Policies_Tables

Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary of Computation of Basic and Diluted Earnings Per Share	'
	The following table shows computation of basic and diluted earnings per share.
			Three months ended				Nine months ended
			September 30				September 30
			2013		2012		2013		2012
			(Unaudited)		(Unaudited)		(Unaudited)		(Unaudited)
	Basic earnings per share
	Net income		$	4,785	$	4,850	$	15,761	$	14,373
	Less: Preferred stock dividends and accretion of discount			66		63		308		325
	Net income available to common shareholders		$	4,719	$	4,787	$	15,453	$	14,048
	Weighted average common shares outstanding (1)(2)			8,618,969		8,503,475		8,617,972		7,758,537
	Basic earnings per share		$	0.55	$	0.56	$	1.79	$	1.81
	Diluted earnings per share
	Net income available to common shareholders		$	4,719	$	4,787	$	15,453	$	14,048
	Weighted average common shares outstanding (1)(2)			8,618,969		8,503,475		8,617,972		7,758,537
	Effect of dilutive securities:
	Warrants			314,353		269,431		299,704		231,037
	Restricted stock			40,833		30,971		39,883		19,317
	Stock options			45,056		34,782		41,069		26,105
	Weighted average shares outstanding			9,019,211		8,838,659		8,998,628		8,034,996
	Diluted earnings per share		$	0.52	$	0.54	$	1.72	$	1.75
	-1	Adjusted for 3:2 stock split on November 9, 2012
	-2	Includes average shares issued for the Heartland acquisition for the three and nine months ending September 30, 2012

Acquisition_Tables

Acquisition (Tables) (Heartland Bancshares Inc [Member])	9 Months Ended
	Sep. 30, 2013
Heartland Bancshares Inc [Member]	'
Schedule of Preliminary Purchase Price of Assets Acquired and Liabilities Assumed	'
	the preliminary purchase price for the Heartland acquisition is allocated as follows (in thousands):
	ASSETS
	Cash and due from banks	$	33,531
	Investment securities, available for sale		63,707
	Commercial		70,343
	Residential mortgage		20,838
	Consumer		23,423
	Total loans		114,604
	Premises and equipment		2,647
	FRB and FHLB stock		943
	Goodwill		13,838
	Core deposit intangible		2,332
	Interest receivable		820
	Cash value life insurance		4,012
	Other assets		9,210
	Total assets purchased	$	245,644
	Common shares issued	$	19,668
	Retirement of TARP preferred shares		7,248
	Total estimated purchase price	$	26,916
	LIABILITIES
	Deposits
	Non-interest bearing	$	59,350
	NOW accounts		42,681
	Savings and money market		61,465
	Certificates of deposits		47,749
	Total deposits		211,245
	Borrowings		1,186
	Subordinated debentures		1,537
	Interest payable		90
	Other liabilities		4,670
	Total liabilities assumed	$	218,728
Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30	'
	The following table details the acquired loans that are accounted for in accordance with ASC 310-30 (formerly Statement of Position “SOP” 03-3) as of July 17, 2012.
	Contractually required principal and interest at acquisition	$	35,574
	Contractual cash flows not expected to be collected (nonaccretable differences)		5,264
	Expected cash flows at acquisition		30,310
	Interest component of expected cash flows (accretable discount)		7,494
	Fair value of acquired loans accounted for under ASC 310-30	$	22,816
Accretable Yield or Income Expected to be Collected	'
	Accretable yield, or income expected to be collected, is as follows:
	Balance at December 31, 2012	$	6,111
	Additions		—
	Accretion		(1,016	)
	Reclassification from nonaccreatable difference		—
	Disposals		(1,629	)
	Balance at September 30, 2013	$	3,466

Loans_Tables

Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Amounts of Loans	'
		September 30			December 31
		2013			2012
	Commercial
	Working capital and equipment	$	239,305		$	198,805
	Real estate, including agriculture		243,262			247,108
	Tax exempt		3,093			4,579
	Other		13,924			9,979
	Total		499,584			460,471
	Real estate
	1-4 family		184,928			185,940
	Other		4,326			3,774
	Total		189,254			189,714
	Consumer
	Auto		137,991			142,149
	Recreation		4,955			5,163
	Real estate/home improvement		31,045			29,989
	Home equity		98,657			104,974
	Unsecured		3,785			4,194
	Other		2,557			2,615
	Total		278,990			289,084
	Mortgage warehouse		113,591			251,448
	Total loans		1,081,419			1,190,717
	Allowance for loan losses		(17,848	)		(18,270	)
	Loans, net	$	1,063,571		$	1,172,447
Recorded Investment of Individual Loan Categories	'
	The following table shows the recorded investment of individual loan categories.
	September 30, 2013	Loan			Interest			Deferred			Recorded
		Balance			Due			Fees / (Costs)			Investment
	Owner occupied real estate	$	153,113		$	226		$	212		$	153,551
	Non owner occupied real estate		229,654			175			430			230,259
	Residential spec homes		242			—			—			242
	Development & spec land loans		15,621			39			43			15,703
	Commercial and industrial		100,194			732			75			101,001
	Total commercial		498,824			1,172			760			500,756
	Residential mortgage		179,964			567			409			180,940
	Residential construction		8,881			17			—			8,898
	Mortgage warehouse		113,591			480			—			114,071
	Total real estate		302,436			1,064			409			303,909
	Direct installment		28,968			92			(278	)		28,782
	Direct installment purchased		331			—			—			331
	Indirect installment		129,450			306			—			129,756
	Home equity		120,222			517			297			121,036
	Total consumer		278,971			915			19			279,905
	Total loans		1,080,231			3,151			1,188			1,084,570
	Allowance for loan losses		(17,848	)		—			—			(17,848	)
	Net loans	$	1,062,383		$	3,151		$	1,188		$	1,066,722
	December 31, 2012	Loan			Interest			Deferred			Recorded
		Balance			Due			Fees / (Costs)			Investment
	Owner occupied real estate	$	162,694		$	503		$	485		$	163,682
	Non owner occupied real estate		201,763			467			276			202,506
	Residential spec homes		1,056			8			—			1,064
	Development & spec land loans		6,963			11			—			6,974
	Commercial and industrial		87,082			380			152			87,614
	Total commercial		459,558			1,369			913			461,840
	Residential mortgage		181,450			565			583			182,598
	Residential construction		7,681			13			—			7,694
	Mortgage warehouse		251,448			480			—			251,928
	Total real estate		440,579			1,058			583			442,220
	Direct installment		27,831			115			(204	)		27,742
	Direct installment purchased		429			—			—			429
	Indirect installment		133,481			370			—			133,851
	Home equity		126,588			605			959			128,152
	Total consumer		288,329			1,090			755			290,174
	Total loans		1,188,466			3,517			2,251			1,194,234
	Allowance for loan losses		(18,270	)		—			—			(18,270	)
	Net loans	$	1,170,196		$	3,517		$	2,251		$	1,175,964
Heartland Bancshares Inc [Member]	'
Amounts of Loans	'
	The carrying amount of those loans is included in the balance sheet amounts of loans receivable at September 30, 2013. The amounts of loans at September 30, 2013, are as follows:
	Commercial	$	44,717
	Real estate		13,146
	Consumer		12,612
	Outstanding balance	$	70,475
	Carrying amount, net of allowance of $488	$	69,987

Securities_Tables

Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Fair Value of Securities	'
	The fair value of securities is as follows:
	September 30, 2013	Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
	Available for sale
	U.S. Treasury and federal agencies	$	43,161	$	243		$	(647	)	$	42,757
	State and municipal		176,711		5,505			(2,699	)		179,517
	Federal agency collateralized mortgage obligations		111,266		1,293			(1,777	)		110,782
	Federal agency mortgage-backed pools		176,880		3,907			(1,593	)		179,194
	Private labeled mortgage-backed pools		1,290		44			—			1,334
	Corporate notes		532		28			—			560
	Total available for sale investment securities	$	509,840	$	11,020		$	(6,716	)	$	514,144
	Held to maturity, State and Municipal	$	9,910	$	—		$	—		$	9,910
	December 31, 2012	Amortized		Gross			Gross			Fair
		Cost		Unrealized			Unrealized			Value
				Gains			Losses
	Available for sale
	U.S. Treasury and federal agencies	$	51,458	$	351		$	(30	)	$	51,779
	State and municipal		162,147		10,842			(84	)		172,905
	Federal agency collateralized mortgage obligations		95,337		1,533			(39	)		96,831
	Federal agency mortgage-backed pools		152,372		6,847			(15	)		159,204
	Private labeled mortgage-backed pools		1,960		71			—			2,031
	Corporate notes		32		19			—			51
	Total available for sale investment securities	$	463,306	$	19,663		$	(168	)	$	482,801
Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity	'
	The amortized cost and fair value of securities available for sale and held to maturity at September 30, 2013 and December 31, 2012, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
		September 30, 2013					December 31, 2012
		Amortized		Fair			Amortized			Fair
		Cost		Value			Cost			Value
	Available for sale
	Within one year	$	3,968	$	3,987		$	4,358		$	4,368
	One to five years		49,167		49,763			49,415			50,673
	Five to ten years		99,931		102,194			98,551			104,258
	After ten years		67,338		66,890			61,313			65,436
			220,404		222,834			213,637			224,735
	Federal agency collateralized mortgage obligations		111,266		110,782			95,337			96,831
	Federal agency mortgage-backed pools		176,880		179,194			152,372			159,204
	Private labeled mortgage-backed pools		1,290		1,334			1,960			2,031
	Total available for sale investment securities	$	509,840	$	514,144		$	463,306		$	482,801
	Held to maturity
	Within one year	$	9,910	$	9,910		$	—		$	—
	One to five years		—		—			—			—
	Total held to maturity investment securities	$	9,910	$	9,910		$	—		$	—
Gross Unrealized Losses and Fair Value of Company's Investments	'
	The following table shows the gross unrealized losses and the fair value of the Company’s investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.
		Less than 12 Months					12 Months or More						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	September 30, 2013	Value		Losses			Value			Losses			Value		Losses
	U.S. Treasury and federal agencies	$	27,836	$	(647	)	$	—		$	—		$	27,836	$	(647	)
	State and municipal		53,822		(2,686	)		1,033			(13	)		54,855		(2,699	)
	Federal agency collateralized mortgage obligations		56,488		(1,645	)		4,499			(132	)		60,987		(1,777	)
	Federal agency mortgage-backed pools		52,517		(1,593	)		—			—			52,517		(1,593	)
	Total temporarily impaired securities	$	190,663	$	(6,571	)	$	5,532		$	(145	)	$	196,195	$	(6,716	)
		Less than 12 Months					12 Months or More						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
	December 31, 2012	Value		Losses			Value			Losses			Value		Losses
	U.S. Treasury and federal agencies	$	13,064	$	(30	)	$	—		$	—		$	13,064	$	(30	)
	State and municipal		11,928		(84	)		—			—			11,928		(84	)
	Federal agency collateralized mortgage obligations		12,719		(39	)		—			—			12,719		(39	)
	Federal agency mortgage-backed pools		4,126		(15	)		—			—			4,126		(15	)
	Total temporarily impaired securities	$	41,837	$	(168	)	$	—		$	—		$	41,837	$	(168	)
Sales of Securities Available for Sale	'
		Three months ended September 30					Nine months ended September 30
		2013		2012			2013			2012
	Sales of securities available for sale (Unaudited)
	Proceeds	$	648	$	—		$	23,853		$	—
	Gross gains		6		—			382			—
	Gross losses		—		—			(8	)		—

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Allowance for Loan Losses	'
	The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the prior one to five years. Management believes the five-year historical loss experience methodology is appropriate in the current economic environment, as it captures loss rates that are comparable to the current period being analyzed. The actual allowance for loan loss activity is provided below.
		Three Months Ended					Nine Months Ended
		September 30					September 30
		2013			2012		2013		2012
		(Unaudited)			(Unaudited)		(Unaudited)		(Unaudited)
	Balance at beginning of the period	$	18,880		$	18,374	$	18,270	$	18,882
	Loans charged-off:
	Commercial
	Owner occupied real estate		—			92		138		95
	Non owner occupied real estate		539			81		730		109
	Residential development		—			—		—		—
	Development & Spec Land Loans		182			—		182		—
	Commercial and industrial		35			221		948		548
	Total commercial		756			394		1,998		752
	Real estate
	Residential mortgage		43			247		602		451
	Residential construction		—			—		—		—
	Mortgage warehouse		—			—		—		—
	Total real estate		43			247		602		451
	Consumer
	Direct Installment		87			90		282		261
	Direct Installment Purchased		—			—		—		—
	Indirect Installment		329			313		953		922
	Home Equity		306			123		945		1,010
	Total consumer		722			526		2,180		2,193
	Total loans charged-off		1,520			1,167		4,780		3,396
	Recoveries of loans previously charged-off:
	Commercial
	Owner occupied real estate		15			—		61		352
	Non owner occupied real estate		35			—		38		7
	Residential development		—			—		—		—
	Development & Spec Land Loans		—			—		—		—
	Commercial and industrial		101			61		248		114
	Total commercial		151			61		347		473
	Real estate
	Residential mortgage		3			42		11		74
	Residential construction		—			—		—		—
	Mortgage warehouse		—			—		—		—
	Total real estate		3			42		11		74
	Consumer
	Direct Installment		10			28		458		63
	Direct Installment Purchased		—			—		—		—
	Indirect Installment		157			173		529		563
	Home Equity		63			16		95		100
	Total consumer		230			217		1,082		726
	Total loan recoveries		384			320		1,440		1,273
	Net loans charged-off		1,136			847		3,340		2,123
	Provision charged to operating expense
	Commercial		741			625		1,543		320
	Real estate		(381	)		254		606		900
	Consumer		(256	)		162		769		589
	Total provision charged to operating expense		104			1,041		2,917		1,809
	Balance at the end of the period	$	17,848		$	18,568	$	17,848	$	18,568
Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment	'
	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 analysis:
	September 30, 2013	Commercial			Real Estate		Mortgage		Consumer		Total
							Warehousing
	Allowance For Loan Losses
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment	$	1,316		$	—	$	—	$	—	$	1,316
	Collectively evaluated for impairment		6,347			3,238		1,686		5,261		16,532
	Total ending allowance balance	$	7,663		$	3,238	$	1,686	$	5,261	$	17,848
	Loans:
	Individually evaluated for impairment	$	7,919		$	—	$	—	$	—	$	7,919
	Collectively evaluated for impairment		492,837			189,838		114,071		279,905		1,076,651
	Total ending loans balance	$	500,756		$	189,838	$	114,071	$	279,905	$	1,084,570
	December 31, 2012	Commercial			Real Estate		Mortgage		Consumer		Total
							Warehousing
	Allowance For Loan Losses
	Ending allowance balance attributable to loans:
	Individually evaluated for impairment	$	1,945		$	—	$	—	$	—	$	1,945
	Collectively evaluated for impairment		5,826			3,204		1,705		5,590		16,325
	Total ending allowance balance	$	7,771		$	3,204	$	1,705	$	5,590	$	18,270
	Loans:
	Individually evaluated for impairment	$	10,597		$	—	$	—	$	—	$	10,597
	Collectively evaluated for impairment		451,243			190,292		251,928		290,174		1,183,637
	Total ending loans balance	$	461,840		$	190,292	$	251,928	$	290,174	$	1,194,234

Nonperforming_Loans_and_Impair1

Non-performing Loans and Impaired Loans (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Nonaccrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans	'
	The following table presents the nonaccrual, loans past due over 90 days still on accrual, and troubled debt restructured (“TDRs”) by class of loans:
	September 30, 2013	Nonaccrual			Loans Past			Non Performing			Performing			Total Non-
					Due Over 90			TDR’s			TDR’s			Performing
					Days Still									Loans
					Accruing
	Commercial
	Owner occupied real estate	$	464		$	—		$	82		$	783		$	1,329
	Non owner occupied real estate		2,829			—			825			—			3,654
	Residential development		—			—			—			—			—
	Development & Spec Land Loans		170			—			—			—			170
	Commercial and industrial		1,953			—			781			—			2,734
	Total commercial		5,416			—			1,688			783			7,887
	Real estate
	Residential mortgage		3,436			2			2,693			1,678			7,809
	Residential construction		—			—			284			—			284
	Mortgage warehouse		—			—			—			—			—
	Total real estate		3,436			2			2,977			1,678			8,093
	Consumer
	Direct Installment		249			—			—			—			249
	Direct Installment Purchased		—			—			—			—			—
	Indirect Installment		657			—			—			—			657
	Home Equity		3,228			—			1,321			1,046			5,595
	Total Consumer		4,134			—			1,321			1,046			6,501
	Total	$	12,986		$	2		$	5,986		$	3,507		$	22,481
	December 31, 2012	Nonaccrual			Loans Past			Non Performing			Performing			Total Non-
					Due Over 90			TDR’s			TDR’s			Performing
					Days Still									Loans
					Accruing
	Commercial
	Owner occupied real estate	$	2,800		$	—		$	1,272		$	819		$	4,891
	Non owner occupied real estate		1,705			—			1,605			446			3,756
	Residential development		—			—			—			—			—
	Development & Spec Land Loans		705			—			—			—			705
	Commercial and industrial		544			—			797			—			1,341
	Total commercial		5,754			—			3,674			1,265			10,693
	Real estate
	Residential mortgage		4,565			2			2,536			1,761			8,864
	Residential construction		—			—			291			—			291
	Mortgage warehouse		—			—			—			—			—
	Total real estate		4,565			2			2,827			1,761			9,155
	Consumer
	Direct Installment		138			26			—			—			164
	Direct Installment Purchased		—			—			—			—			—
	Indirect Installment		866			26			—			—			892
	Home Equity		2,051			—			148			676			2,875
	Total Consumer		3,055			52			148			676			3,931
	Total	$	13,374		$	54		$	6,649		$	3,702		$	23,779
Loans Transferred and Classified as Troubled Debt Restructured Loans	'
	Loans transferred and classified as troubled debt restructured loans during the nine months ended September 30, 2013 and 2012, segregated by class, are shown in the table below.
		September 30, 2013						September 30, 2012
		Number			Unpaid			Number			Unpaid
		of			Principal			of			Principal
		Defaults			Balance			Defaults			Balance
	Commercial
	Owner occupied real estate		2		$	81			3		$	1,472
	Non owner occupied real estate		1			68			3			637
	Residential development		—			—			—			—
	Development & Spec Land Loans		—			—			—			—
	Commercial and industrial		—			—			—			—
	Total commercial		3			149			6			2,109
	Real estate
	Residential mortgage		8			1,132			1			582
	Residential construction		—			—			—			—
	Mortgage warehouse		—			—			—			—
	Total real estate		8			1,132			1			582
	Consumer
	Direct Installment		—			—			—			—
	Direct Installment Purchased		—			—			—			—
	Indirect Installment		—			—			—			—
	Home Equity		7			1,882			—			—
	Total Consumer		7			1,882			—			—
	Total		18		$	3,163			7		$	2,691
	Troubled debt restructured loans which had payment defaults during the nine months ended September 30, 2013 and 2012, segregated by class, are shown in the table below. Default occurs when a loan is 90 days or more past due or has been transferred to nonaccrual.
		September 30, 2013						September 30, 2012
		Number			Unpaid			Number			Unpaid
		of			Principal			of			Principal
		Defaults			Balance			Defaults			Balance
	Commercial
	Owner occupied real estate		2		$	81			3		$	1,473
	Non owner occupied real estate		1			68			2			261
	Residential development		—			—			—			—
	Development & Spec Land Loans		—			—			—			—
	Commercial and industrial		—			—			—			—
	Total commercial		3			149			5			1,734
	Real estate
	Residential mortgage		4			400			2			677
	Residential construction		—			—			—			—
	Mortgage warehouse		—			—			—			—
	Total real estate		4			400			2			677
	Consumer
	Direct Installment		—			—			—			—
	Direct Installment Purchased		—			—			—			—
	Indirect Installment		—			—			—			—
	Home Equity		4			1,175			—			—
	Total Consumer		4			1,175			—			—
	Total		11		$	1,724			7		$	2,411
Commercial Loans Individually Evaluated for Impairment by Class of Loans	'
	The following table presents commercial loans individually evaluated for impairment by class of loan:
											Three Months Ending						Nine Months Ending
	September 30, 2013	Unpaid			Recorded			Allowance For			Average			Cash/ Accrual			Average		Cash/ Accrual
		Principal			Investment			Loan Loss			Balance in			Interest			Balance in		Interest
		Balance						Allocated			Impaired			Income			Impaired		Income
											Loans			Recognized			Loans		Recognized
	With no recorded allowance
	Commercial
	Owner occupied real estate	$	1,329		$	1,331		$	—		$	1,959			16		$	2,685	$	43
	Non owner occupied real estate		3,167			3,170			—			3,814			8			3,298		21
	Residential development		—			—			—			—			—			—		—
	Development & Spec Land Loans		21			21			—			24			—			25		—
	Commercial and industrial		546			561			—			1,297			—			1,311		—
	Total commercial		5,063			5,083			—			7,094			24			7,319		64
	With an allowance recorded
	Commercial
	Owner occupied real estate		—			—			—			(1	)		—			—		—
	Non owner occupied real estate		487			487			302			491			—			502		—
	Residential development		—			—			—			—			—			—		—
	Development & Spec Land Loans		149			149			48			173			—			165		—
	Commercial and industrial		2,188			2,200			966			2,379			—			1,808		23
	Total commercial		2,824			2,836			1,316			3,042			—			2,475		23
	Total	$	7,887		$	7,919		$	1,316		$	10,136		$	24		$	9,794	$	87
											Three Months Ending						Nine Months Ending
	September 30, 2012	Unpaid			Recorded			Allowance For			Average			Cash/ Accrual			Average		Cash/ Accrual
		Principal			Investment			Loan Loss			Balance in			Interest			Balance in		Interest
		Balance						Allocated			Impaired			Income			Impaired		Income
											Loans			Recognized			Loans		Recognized
	With no recorded allowance
	Commercial
	Owner occupied real estate	$	4,457		$	4,460		$	—		$	3,810		$	—		$	1,978	$	3
	Non owner occupied real estate		2,521			2,542			—			2,429			70			1,920		72
	Residential development		—			—			—			—			—			—		—
	Development & Spec Land Loans		131			131			—			109			—			37		—
	Commercial and industrial		456			471			—			382			—			129		—
	Total commercial		7,565			7,604			—			6,730			70			4,064		75
	With an allowance recorded
	Commercial
	Owner occupied real estate		903			903			450			910			—			1,109		1
	Non owner occupied real estate		2,938			2,938			1,065			2,943			—			2,843		—
	Residential development		—			—			—			—			—			—		—
	Development & Spec Land Loans		658			658			615			660			—			523		6
	Commercial and industrial		801			801			273			801			—			807		—
	Total commercial		5,300			5,300			2,403			5,314			—			5,282		7
	Total	$	12,865		$	12,904		$	2,403		$	12,044		$	70		$	9,346	$	82
Payment Status by Class of Loan	'
	The following table presents the payment status by class of loan:
	September 30, 2013	30 - 59 Days			60 - 89 Days			Greater than 90			Total Past Due			Loans Not Past			Total
		Past Due			Past Due			Days Past Due						Due
	Commercial
	Owner occupied real estate	$	99		$	—		$	—		$	99		$	153,014		$	153,113
	Non owner occupied real estate		45			—			—			45			229,609			229,654
	Residential development		—			—			—			—			242			242
	Development & Spec Land Loans		—			—			—			—			15,621			15,621
	Commercial and industrial		13			—			—			13			100,181			100,194
	Total commercial		157			—			—			157			498,667			498,824
	Real estate
	Residential mortgage		695			351			2			1,048			178,916			179,964
	Residential construction		—			—			—			—			8,881			8,881
	Mortgage warehouse		—			—			—			—			113,591			113,591
	Total real estate		695			351			2			1,048			301,388			302,436
	Consumer
	Direct Installment		122			13			—			135			28,833			28,968
	Direct Installment Purchased		—			—			—			—			331			331
	Indirect Installment		894			60			—			954			128,496			129,450
	Home Equity		173			227			—			400			119,822			120,222
	Total consumer		1,189			300			—			1,489			277,482			278,971
	Total	$	2,041		$	651		$	2		$	2,694		$	1,077,537		$	1,080,231
	Percentage of total loans		0.19	%		0.06	%		0	%		0.25	%		99.75	%
	December 31, 2012	30 - 59 Days			60 - 89 Days			Greater than 90			Total Past Due			Loans Not Past			Total
		Past Due			Past Due			Days Past Due						Due
	Commercial
	Owner occupied real estate	$	2,207		$	19		$	—		$	2,226		$	160,468		$	162,694
	Non owner occupied real estate		669			147			—			816			200,947			201,763
	Residential development		—			—			—			—			1,056			1,056
	Development & Spec Land Loans		—			—			—			—			6,963			6,963
	Commercial and industrial		538			16			—			554			86,528			87,082
	Total commercial		3,414			182			—			3,596			455,962			459,558
	Real estate
	Residential mortgage		167			—			2			169			181,281			181,450
	Residential construction		—			—			—			—			7,681			7,681
	Mortgage warehouse		—			—			—			—			251,448			251,448
	Total real estate		167			—			2			169			440,410			440,579
	Consumer
	Direct Installment		240			64			26			330			27,501			27,831
	Direct Installment Purchased		—			—			—			—			429			429
	Indirect Installment		1,105			177			26			1,308			132,173			133,481
	Home Equity		1,072			321			—			1,393			125,195			126,588
	Total consumer		2,417			562			52			3,031			285,298			288,329
	Total	$	5,998		$	744		$	54		$	6,796		$	1,181,670		$	1,188,466
	Percentage of total loans		0.5	%		0.06	%		0	%		0.57	%		99.43	%
Loans by Credit Grades	'
	The following table presents loans by credit grades.
	September 30, 2013	Pass			Special			Substandard			Doubtful			Total
					Mention
	Commercial
	Owner occupied real estate	$	142,836		$	2,600		$	7,677		$	—		$	153,113
	Non owner occupied real estate		210,632			3,119			15,903			—			229,654
	Residential development		242			—			—			—			242
	Development & Spec Land Loans		13,844			94			1,683			—			15,621
	Commercial and industrial		90,221			5,410			4,563			—			100,194
	Total commercial		457,775			11,223			29,826			—			498,824
	Real estate
	Residential mortgage		172,155			—			7,809			—			179,964
	Residential construction		8,597			—			284			—			8,881
	Mortgage warehouse		113,591			—			—			—			113,591
	Total real estate		294,343			—			8,093			—			302,436
	Consumer
	Direct Installment		28,719			—			249			—			28,968
	Direct Installment Purchased		331			—			—			—			331
	Indirect Installment		128,793			—			657			—			129,450
	Home Equity		114,627			—			5,595			—			120,222
	Total Consumer		272,470			—			6,501			—			278,971
	Total	$	1,024,587		$	11,223		$	44,420		$	—		$	1,080,231
	Percentage of total loans		94.85	%		1.04	%		4.11	%		0	%
	December 31, 2012	Pass			Special			Substandard			Doubtful			Total
					Mention
	Commercial
	Owner occupied real estate	$	137,664		$	6,407		$	17,029		$	1,594		$	162,694
	Non owner occupied real estate		171,319			19,440			10,717			287			201,763
	Residential development		405			—			651			—			1,056
	Development & Spec Land Loans		3,171			178			3,614			—			6,963
	Commercial and industrial		78,810			3,136			5,136			—			87,082
	Total commercial		391,369			29,161			37,147			1,881			459,558
	Real estate
	Residential mortgage		172,586			—			8,864			—			181,450
	Residential construction		7,390			—			291			—			7,681
	Mortgage warehouse		251,448			—			—			—			251,448
	Total real estate		431,424			—			9,155			—			440,579
	Consumer
	Direct Installment		27,667			—			164			—			27,831
	Direct Installment Purchased		429			—			—			—			429
	Indirect Installment		132,589			—			892			—			133,481
	Home Equity		123,713			—			2,875			—			126,588
	Total Consumer		284,398			—			3,931			—			288,329
	Total	$	1,107,191		$	29,161		$	50,233		$	1,881		$	1,188,466
	Percentage of total loans		93.16	%		2.45	%		4.23	%		0.16	%

Derivative_financial_instrumen1

Derivative financial instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Fair Value of Derivative Financial Instruments	'
	The following tables summarize the fair value of derivative financial instruments utilized by Horizon Bancorp:
		Asset Derivative						Liability Derivatives
		September 30, 2013						September 30, 2013
		Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments (Unaudited)
	Interest rate contracts	Loans		$	23			Other liabilities		$	579
	Interest rate contracts	Other Assets			556			Other liabilities			3,435
	Total derivatives designated as hedging instruments				579						4,014
	Derivatives not designated as hedging instruments
	Mortgage loan contracts	Other assets			619			Other liabilities			—
	Total derivatives not designated as hedging instruments				619						—
	Total derivatives			$	1,198					$	4,014
		Asset Derivative						Liability Derivatives
		December 31, 2012						December 31, 2012
		Balance Sheet		Fair Value				Balance Sheet		Fair Value
		Location						Location
	Derivatives designated as hedging instruments (Unaudited)
	Interest rate contracts	Loans		$	279			Other liabilities		$	2,214
	Interest rate contracts	Other Assets			1,935			Other liabilities			5,493
	Total derivatives designated as hedging instruments				2,214						7,707
	Derivatives not designated as hedging instruments
	Mortgage loan contracts	Other assets			858			Other liabilities			—
	Total derivatives not designated as hedging instruments				858						—
	Total derivatives			$	3,072					$	7,707
Effect of the Derivative Instruments on the Consolidated Statement of Income Derivative in Cash Flow Hedging Relationship	'
	The effect of the derivative instruments on the condensed consolidated statement of income for the three and nine month periods ending 2013 and 2012 is as follows:
		Comprehensive Income on Derivative								Comprehensive Income on Derivative
		(Effective Portion)								(Effective Portion)
		Three Months Ended September 30								Nine Months Ended September 30
	Derivative in cash flow hedging relationship	2013				2012				2013				2012
		(Unaudited)				(Unaudited)				(Unaudited)				(Unaudited)
	Interest rate contracts	$	25			$	(169	)		$	1,338			$	(588	)
Effect of the Derivative Instruments on the Consolidated Statement of Income Derivative in Fair Value Hedging Relationship	'
	Topic 820-10-55 establishes a fair value hierarchy that emphasizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value.
				Amount of Gain (Loss) Recognized								Amount of Gain (Loss) Recognized
				on Derivative								on Derivative
				Three Months Ended September 30								Nine Months Ended September 30
	Derivative in fair value hedging	Location of gain (loss)		2013				2012				2013				2012
	relationship	recognized on derivative		(Unaudited)				(Unaudited)				(Unaudited)				(Unaudited)
	Interest rate contracts	Interest income - loans		$	211			$	112			$	(1,635	)		$	336
	Interest rate contracts	Interest income - loans			(211	)			(112	)			1,635				(336	)
	Total			$	—			$	—			$	—			$	—
				Amount of Gain (Loss) Recognized								Amount of Gain (Loss) Recognized
				on Derivative								on Derivative
				Three Months Ended September 30								Nine Months Ended September 30
	Derivative not designated as	Location of gain (loss)		2013				2012				2013				2012
	hedging relationship	recognized on derivative		(Unaudited)				(Unaudited)				(Unaudited)				(Unaudited)
	Mortgage contracts	Other income - gain on sale of loans		$	169			$	320			$	(239	)		$	600

Disclosures_about_fair_value_o1

Disclosures about fair value of assets and liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis	'
	The following table presents the fair value measurements of assets and liabilities recognized in the accompanying financial statements measured at fair value on a recurring basis and the level within the FASB ASC fair value hierarchy in which the fair value measurements fall at the following:
		Fair Value			Quoted Prices in			Significant			Significant
					Active Markets			Other			Unobservable
					for Identical			Observable			Inputs
					Assets			Inputs			(Level 3)
					(Level 1)			(Level 2)
	September 30, 2013
	Available-for-sale securities
	U.S. Treasury and federal agencies	$	42,757		$	—		$	42,757		$	—
	State and municipal		179,517			—			179,517			—
	Federal agency collateralized mortgage obligations		110,782			—			110,782			—
	Federal agency mortgage-backed pools		179,194			—			179,194			—
	Private labeled mortgage-backed pools		1,334			—			1,334			—
	Corporate notes		560			—			560			—
	Total available-for-sale securities		514,144			—			514,144			—
	Hedged loans		89,718			—			89,718			—
	Forward sale commitments		619			—			619			—
	Interest rate swap agreements		(4,014	)		—			(4,014	)		—
	Commitments to originate loans		—			—			—			—
	December 31, 2012
	Available-for-sale securities
	U.S. Treasury and federal agencies	$	51,779		$	—		$	51,779		$	—
	State and municipal		172,905			—			172,905			—
	Federal agency collateralized mortgage obligations		96,831			—			96,831			—
	Federal agency mortgage-backed pools		159,204			—			159,204			—
	Private labeled mortgage-backed pools		2,031			—			2,031			—
	Corporate notes		51			—			51			—
	Total available-for-sale securities		482,801			—			482,801			—
	Hedged loans		81,018			—			81,018			—
	Forward sale commitments		858			—			858			—
	Interest rate swap agreements		(7,707	)		—			(7,707	)		—
	Commitments to originate loans		—			—			—			—
Schedule of Fair Value Transfer Among Levels	'
	Transfers between Levels 1, 2 and 3 and the reasons for those transfers are as follows:
	December 31, 2012	Quoted Prices			Significant			Significant			Reason
		in Active			Other			Unobservable			for
		Markets for			Observable			Inputs			Transfer
		Identical			Inputs			(Level 3)
		Assets			(Level 2)
		(Level 1)
	Transfers to level:
	Hedged loans	$	—		$	59,911		$	—				(a)
	Forward sale commitments		—			510			—				(b)
	Interest rate swap agreements		—			(6,464	)		—				(a)
	Commitments to originate loans		—			(71	)		—				(b)
	Total transfers to level	$	—		$	53,886		$	—
	(a)	-		Valuation determined by widely accepted techniques including discounted cash flow analysis on expected cash flows of each derivative and observable market rate inputs such as yield curves and contractual terms on each instrument.
	(b)	-		Valuation determined by quoted prices for similar loans in the secondary market with an expected fallout rate (interest rate locked pipeline loans not expected to close). Fallout rate is not considered a significant input to the fair value in its entirety.
Reconciliation of the Beginning and Ending Balances of Recurring Fair Value Measurements Recognized in the Accompanying Condensed Consolidated Balance Sheet Using Significant Unobservable (Level 3) Inputs	'
	The following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs:
		Hedged Loans			Forward Sale			Interest Rate			Commitments to
					Commitments			Swaps			Originate Loans
	Beginning balance December 31, 2011	$	54,362		$	662		$	(7,101	)	$	—
	Total realized and unrealized gains and losses
	Included in net income		(74	)		(152	)		74			(71	)
	Included in other comprehensive income, gross		—			—			563			—
	Purchases, issuances, and settlements		6,114			—			—			—
	Principal payments		(491	)		—			—			—
	Transfers out to Level 2		(59,911	)		(510	)		6,464			71
	Ending balance December 31, 2012	$	—		$	—		$	—		$	—
Realized Gains and Losses Included in Net Income for the Periods in the Condensed Consolidated Statements of Income	'
	Realized gains and losses included in net income for the periods are reported in the condensed consolidated statements of income as follows:
		Three Months Ended September 30						Nine Months Ended September 30
		2013			2012			2013			2012
	Non Interest Income	(Unaudited)			(Unaudited)			(Unaudited)			(Unaudited)
	Total gains and losses from:
	Hedged loans	$	211		$	112		$	(1,635	)	$	336
	Fair value interest rate swap agreements		(211	)		(112	)		1,635			(336	)
	Derivative loan commitments		169			320			(239	)		600
		$	169		$	320		$	(239	)	$	600
Other Assets Measured at Fair Value on a Nonrecurring Basis	'
	Certain other assets are measured at fair value on a nonrecurring basis in the ordinary course of business and are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment):
		Fair Value			Quoted Prices in			Significant Other			Significant
					Active Markets for			Observable			Unobservable
					Identical Assets			Inputs			Inputs
					(Level 1)			(Level 2)			(Level 3)
	September 30, 2013
	Impaired loans	$	6,571		$	—		$	—		$	6,571
	Mortgage servicing rights		6,302			—			—			6,302
	December 31, 2012
	Impaired loans	$	8,652		$	—		$	—		$	8,652
	Mortgage servicing rights		5,145			—			—			5,145
Qualitative Information About Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements, Other than Goodwill	'
	The following table presents qualitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill.
		Fair Value at			Valuation		Unobservable Inputs	Range (Weighted
		September 30, 2013			Technique			Average)
	Impaired loans	$	6,571		Collateral based		Discount to reflect current market	10% - 15%(12%)
					measurement		conditions and ultimate
							collectability
	Mortgage servicing rights	$	6,302		Discounted		Discount rate, Constant	10% - 15%(12%),
					cashflows		prepayment rate, Probably of	4% - 7%(4.6%),
							default	1% - 10%(4.5%)
		Fair Value at			Valuation		Unobservable Inputs	Range (Weighted
		December 31, 2012			Technique			Average)
	Impaired loans	$	8,652		Collateral based		Discount to reflect current market	10% - 15%(12%)
					measurement		conditions and ultimate
							collectability
	Mortgage servicing rights	$	5,145		Discounted		Discount rate, Constant	10% - 15%(12%),
					cashflows		prepayment rate, Probably of	4% - 7%(4.6%),
							default	1% - 10%(4.5%)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Summary of Estimated Fair Values of the Financial Instruments	'
	The following table presents estimated fair values of the Company’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall (unaudited).
		September 30, 2013
		Carrying		Quoted Prices		Significant		Significant
		Amount		in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets
	Cash and due from banks	$	40,500	$	40,500	$	—	$	—
	Investment securities, held to maturity		9,910		—		—		9,910
	Loans held for sale		4,594		—		—		4,594
	Loans excluding loan level hedges, net		973,300		—		—		996,408
	Stock in FHLB and FRB		14,184		—		14,184		—
	Interest receivable		7,506		—		7,506		—
	Liabilities
	Non-interest bearing deposits	$	223,354	$	223,354	$	—	$	—
	Interest-bearing deposits		1,104,966		—		1,060,853		—
	Borrowings		242,505		—		245,043		—
	Subordinated debentures		32,448		—		32,483		—
	Interest payable		488		—		488		—
		December 31, 2012
		Carrying		Quoted Prices		Significant		Significant
		Amount		in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Assets		(Level 2)
				(Level 1)
	Assets
	Cash and due from banks	$	30,735	$	30,735	$	—	$	—
	Loans held for sale		13,744		—		—		13,744
	Loans excluding loan level hedges, net		1,089,215		—		—		1,118,255
	Stock in FHLB and FRB		13,333		—		13,333		—
	Interest receivable		7,716		—		7,716		—
	Liabilities
	Non-interest bearing deposits	$	209,200	$	209,200	$	—	$	—
	Interest-bearing deposits		1,084,953		—		1,092,184		—
	Borrowings		345,764		—		352,891		—
	Subordinated debentures		32,331		—		32,268		—
	Interest payable		560		—		560		—

Other_Comprehensive_Income_Tab

Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Components of Accumulated Other Comprehensive Income	'
			Accumulated Other Comprehensive Income (1)
	Unaudited		Unrealized			Unrealized			Total
			Gains (Losses) on			Gains (Losses)
			Securities			on Derivative
			Available-for-Sale			Instruments
	Balance at December 31, 2012		$	12,671		$	(3,570	)	$	9,101
	Other comprehensive income (loss) before reclassifications			(9,631	)		1,338			(8,293	)
	Amounts reclassified from other comprehensive income			(243	)		—			(243	)
	Period change			(9,874	)		1,338			(8,536	)
	Balance at September 30, 2013		$	2,797		$	(2,232	)	$	565
	Balance at December 31, 2011		$	11,036		$	(3,194	)	$	7,842
	Other comprehensive income (loss) before reclassifications			2,947			(588	)		2,359
	Amounts reclassified from other comprehensive income			—			—			—
	Period change			2,947			(588	)		2,359
	Balance at September 30, 2012		$	13,983		$	(3,782	)	$	10,201
	(1)	All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 35%.
Details about Accumulated Other Comprehensive Income Components	'
			Amount Reclassified from
	Details About Accumulated Other Comprehensive Income Components		Accumulated Other Comprehensive						Affected Line Items in the
			Income For the Three						Statement of Net Income
			Months Ended September 30,
	Unaudited		2013			2012
	Securities available-for-sale (1)
	Net securities gains reclassified into earnings		$	6		$	—		Gain on sale of investment securities
	Related income tax expense			(2	)		—		Income tax expense
	Net effect on accumulated other comprehensive income for the period			4			—		Net of tax
	Total reclassifications for the period		$	4		$	—		Net of tax
	(1)	For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income see Note 3, “Securities”
	Details About Accumulated Other Comprehensive Income Components		Amount Reclassified from						Affected Line Items in the
			Accumulated Other Comprehensive						Statement of Net Income
			Income For the Nine
			Months Ended  September 30,
	Unaudited		2013			2012
	Securities available-for-sale (1)
	Net securities gains reclassified into earnings		$	374		$	—		Gain on sale of investment securities
	Related income tax expense			(131	)		—		Income tax expense
	Net effect on accumulated other comprehensive income for the period			243			—		Net of tax
	Total reclassifications for the period		$	243		$	—		Net of tax
	(1)	For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income see Note 3, “Securities”

Accounting_Policies_Summary_of

Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic earnings per share	'	'	'	'
Net income	$4,785	$4,850	$15,761	$14,373
Less: Preferred stock dividends and accretion of discount	66	63	308	325
Net Income Available to Common Shareholders	4,719	4,787	15,453	14,048
Weighted average common shares outstanding	8,618,969	8,503,475	8,617,972	7,758,537
Basic Earnings Per Share	$0.55	$0.56	$1.79	$1.81
Diluted earnings per share	'	'	'	'
Net income available to common shareholders	$4,719	$4,787	$15,453	$14,048
Weighted average common shares outstanding	8,618,969	8,503,475	8,617,972	7,758,537
Effect of dilutive securities:	'	'	'	'
Warrants	314,353	269,431	299,704	231,037
Weighted average shares outstanding	9,019,211	8,838,659	8,998,628	8,034,996
Diluted Earnings Per Share	$0.52	$0.54	$1.72	$1.75
Restricted Stock [Member]	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Effect of dilutive securities	40,833	30,971	39,883	19,317
Stock Options [Member]	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Effect of dilutive securities	45,056	34,782	41,069	26,105

Accounting_Policies_Summary_of1

Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)	Nov. 09, 2012
Accounting Policies [Abstract]	'
Stock split conversion ratio	1.5

Accounting_Policies_Additional

Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]	'	'
Shares, non-dilutive	0	12,750
Reclassifications effect on net income	$0	'

Acquisition_Additional_Informa

Acquisition - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended	12 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jul. 17, 2012	Sep. 30, 2013	Dec. 31, 2012	Jul. 17, 2012	Sep. 30, 2013
							Heartland [Member]	Heartland [Member]	Heartland [Member]	Heartland Bancshares Inc [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Date of acquisition agreement	'	'	17-Jul-12	'	'	'	'	'	'	'
Exchange ratio per share to Heartland shareholder	'	'	'	'	'	'	'	'	$0.81	'
Common stock outstanding	8,619,716	'	8,619,716	'	8,617,466	'	'	'	1,442,449	'
Common stock issued	'	'	'	'	'	'	1,168,383	'	'	'
Market closing price per share	'	'	'	'	'	'	'	'	$16.83	'
Transaction value is estimated	'	'	'	'	'	'	'	'	$26,900,000	'
Costs related to the acquisition	'	'	'	'	'	'	'	1,500,000	'	'
Net tangible assets acquired	'	'	'	'	'	'	'	'	26,900,000	'
Net intangible assets acquired	'	'	'	'	'	2,332,000	'	'	2,300,000	'
Acquisition of goodwill	'	'	'	'	'	13,838,000	'	'	13,800,000	'
Purchase price of the business assets	'	'	'	'	'	2,647,000	'	'	10,800,000	'
Core deposit intangible amortization period	'	'	'	'	'	'	'7 years	'	'	'
Loan portfolio acquired	'	'	'	'	'	'	'	'	131,100,000	'
Discount on loan portfolio acquired	'	'	'	'	'	'	'	'	16,500,000	'
Performing portion of the loan portfolio acquired	'	'	'	'	'	'	'	'	95,400,000	'
Estimated fair value of performing portion of the loan portfolio	'	'	'	'	'	'	'	'	91,600,000	'
Total provision charged to operating expense	104,000	1,041,000	2,917,000	1,809,000	'	'	'	'	'	1,600,000
Allowances for loan losses	'	'	'	'	'	'	'	'	'	$0

Acquisition_Schedule_of_Prelim

Acquisition - Schedule of Preliminary Purchase Price of Assets Acquired and Liabilities Assumed (Detail) (USD $)	Jul. 17, 2012
In Thousands, unless otherwise specified
ASSETS	'
Cash and due from banks	$33,531
Investment securities, available for sale	63,707
Total loans	114,604
Premises and equipment	2,647
FRB and FHLB stock	943
Goodwill	13,838
Core deposit intangible	2,332
Interest receivable	820
Cash value life insurance	4,012
Other assets	9,210
Total assets purchased	245,644
Common shares issued	19,668
Retirement of TARP preferred shares	7,248
Total estimated purchase price	26,916
Deposits	'
Non-interest bearing	59,350
NOW accounts	42,681
Savings and money market	61,465
Certificates of deposits	47,749
Total deposits	211,245
Borrowings	1,186
Subordinated debentures	1,537
Interest payable	90
Other liabilities	4,670
Total liabilities assumed	218,728
Residential mortgage [Member]	'
ASSETS	'
Total loans	20,838
Commercial [Member]	'
ASSETS	'
Total loans	70,343
Consumer [Member]	'
ASSETS	'
Total loans	$23,423

Acquisition_Schedule_of_Acquir

Acquisition - Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30 (Detail) (USD $)	Jul. 17, 2012
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'
Contractually required principal and interest at acquisition	$35,574
Contractual cash flows not expected to be collected (nonaccretable differences)	5,264
Expected cash flows at acquisition	30,310
Interest component of expected cash flows (accretable discount)	7,494
Fair value of acquired loans accounted for under ASC 310-30	$22,816

Acquisition_Amounts_of_Loans_D

Acquisition - Amounts of Loans (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Outstanding balance	$1,081,419	$1,190,717
Carrying amount, net of allowance of $488	1,062,383	1,170,196
Heartland Bancshares Inc [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Outstanding balance	70,475	'
Carrying amount, net of allowance of $488	69,987	'
Commercial [Member] | Heartland Bancshares Inc [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Outstanding balance	44,717	'
Real Estate [Member] | Heartland Bancshares Inc [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Outstanding balance	13,146	'
Consumer [Member] | Heartland Bancshares Inc [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Outstanding balance	$12,612	'

Acquisition_Amounts_of_Loans_P

Acquisition - Amounts of Loans (Parenthetical) (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Net of allowance	$17,848	$18,880	$18,270	$18,568	$18,374	$18,882
Heartland Bancshares Inc [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Net of allowance	$488	'	'	'	'	'

Acquisition_Accretable_Yield_o

Acquisition - Accretable Yield or Income Expected to be Collected (Detail) (Heartland Bancshares Inc [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Heartland Bancshares Inc [Member]	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'
Balance at December 31, 2012	$6,111
Additions	'
Accretion	-1,016
Reclassification from nonaccretable difference	'
Disposals	-1,629
Balance at September 30, 2013	$3,466

Securities_Fair_Value_of_Secur

Securities - Fair Value of Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	$509,840	$463,306
Held-to-maturity, Amortized Cost	9,910	'
Gross Unrealized Gains	11,020	19,663
Gross Unrealized Losses	-6,716	-168
Available-for-sale Securities, Fair Value	514,144	482,801
Held-to-maturity, Fair Value	9,910	'
U.S.Treasury and Federal Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	43,161	51,458
Gross Unrealized Gains	243	351
Gross Unrealized Losses	-647	-30
Available-for-sale Securities, Fair Value	42,757	51,779
State and Municipal [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	176,711	162,147
Held-to-maturity, Amortized Cost	9,910	'
Gross Unrealized Gains	5,505	10,842
Held-to-maturity, Gross Unrealized Gains	'	'
Gross Unrealized Losses	-2,699	-84
Held-to-maturity, Gross Unrealized Losses	'	'
Available-for-sale Securities, Fair Value	179,517	172,905
Held-to-maturity, Fair Value	9,910	'
Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	111,266	95,337
Gross Unrealized Gains	1,293	1,533
Gross Unrealized Losses	-1,777	-39
Available-for-sale Securities, Fair Value	110,782	96,831
Federal Agency Mortgage-Backed Pools [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	176,880	152,372
Gross Unrealized Gains	3,907	6,847
Gross Unrealized Losses	-1,593	-15
Available-for-sale Securities, Fair Value	179,194	159,204
Private Labeled Mortgage-Backed Pools [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	1,290	1,960
Gross Unrealized Gains	44	71
Gross Unrealized Losses	'	'
Available-for-sale Securities, Fair Value	1,334	2,031
Corporate Notes [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	532	32
Gross Unrealized Gains	28	19
Gross Unrealized Losses	'	'
Available-for-sale Securities, Fair Value	$560	$51

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	Sep. 30, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]	'
Unrealized loss, other than temporary securities	$0

Securities_Amortized_Cost_and_

Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost within one year	$3,968	$4,358
Amortized cost one to five years	49,167	49,415
Amortized cost for five to ten years	99,931	98,551
Amortized cost for after ten years	67,338	61,313
Total amortized cost	220,404	213,637
Total available for sale investment securities, Amortized Cost	509,840	463,306
Within one year, amortized cost	9,910	'
One to five years, amortized cost	'	'
Total held to maturity investment securities, amortized cost	9,910	'
Fair value within one year	3,987	4,368
Fair value for one to five years	49,763	50,673
Fair value for five to ten years	102,194	104,258
Fair value for after ten years	66,890	65,436
Total fair value	222,834	224,735
Investment securities, available for sale	514,144	482,801
Within one year, fair value	9,910	'
One to five years, fair value	'	'
Held-to-maturity, fair value	9,910	'
Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	111,266	95,337
Investment securities, available for sale	110,782	96,831
Federal Agency Mortgage-Backed Pools [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	176,880	152,372
Investment securities, available for sale	179,194	159,204
Private Labeled Mortgage-Backed Pools [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale investment securities, Amortized Cost	1,290	1,960
Investment securities, available for sale	$1,334	$2,031

Securities_Gross_Unrealized_Lo

Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value less than 12 months	$190,663	$41,837
Fair value more than 12 months	5,532	'
Total fair value	196,195	41,837
Unrealized losses less than 12 months	-6,571	-168
Unrealized losses more than 12 months	-145	'
Total unrealized losses	-6,716	-168
U.S.Treasury and Federal Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value less than 12 months	27,836	13,064
Fair value more than 12 months	'	'
Total fair value	27,836	13,064
Unrealized losses less than 12 months	-647	-30
Unrealized losses more than 12 months	'	'
Total unrealized losses	-647	-30
State and Municipal [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value less than 12 months	53,822	11,928
Fair value more than 12 months	1,033	'
Total fair value	54,855	11,928
Unrealized losses less than 12 months	-2,686	-84
Unrealized losses more than 12 months	-13	'
Total unrealized losses	-2,699	-84
Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value less than 12 months	56,488	12,719
Fair value more than 12 months	4,499	'
Total fair value	60,987	12,719
Unrealized losses less than 12 months	-1,645	-39
Unrealized losses more than 12 months	-132	'
Total unrealized losses	-1,777	-39
Federal Agency Mortgage-Backed Pools [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value less than 12 months	52,517	4,126
Fair value more than 12 months	'	'
Total fair value	52,517	4,126
Unrealized losses less than 12 months	-1,593	-15
Unrealized losses more than 12 months	'	'
Total unrealized losses	($1,593)	($15)

Securities_Sales_of_Securities

Securities - Sales of Securities Available for Sale (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments Debt And Equity Securities [Abstract]	'	'	'	'
Proceeds	$648	'	$23,853	'
Gross gains	6	'	382	'
Gross losses	'	'	($8)	'

Loans_Amounts_of_Loans_Detail

Loans - Amounts of Loans (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Commercial, Total	$499,584	'	$460,471	'	'	'
Real Estate, Total	189,254	'	189,714	'	'	'
Consumer, Total	278,990	'	289,084	'	'	'
Mortgage warehouse	113,591	'	251,448	'	'	'
Total loans	1,081,419	'	1,190,717	'	'	'
Allowance for loan losses	-17,848	-18,880	-18,270	-18,568	-18,374	-18,882
Loans, net	1,063,571	'	1,172,447	'	'	'
Consumer Loans Auto Financing Receivable [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Consumer, Total	137,991	'	142,149	'	'	'
Home Equity Line of Credit [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Consumer, Total	98,657	'	104,974	'	'	'
Working Capital and Equipment [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Commercial, Total	239,305	'	198,805	'	'	'
Real Estate Including Agriculture [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Commercial, Total	243,262	'	247,108	'	'	'
Tax Exempt Loans Receivable [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Commercial, Total	3,093	'	4,579	'	'	'
Other Commercial Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Commercial, Total	13,924	'	9,979	'	'	'
1-4 Family [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Real Estate, Total	184,928	'	185,940	'	'	'
Other [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Real Estate, Total	4,326	'	3,774	'	'	'
Recreation Consumer Loans Receivable [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Consumer, Total	4,955	'	5,163	'	'	'
Real Estate Home Improvement Loans Receivable [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Consumer, Total	31,045	'	29,989	'	'	'
Unsecured Debt [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Consumer, Total	3,785	'	4,194	'	'	'
Other Consumer Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Consumer, Total	$2,557	'	$2,615	'	'	'

Loans_Additional_Information_D

Loans - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Period of loan sold	'30 days
Minimum period seldom held	'90 days
Mortgage warehousing maximum pay off period	'30 days

Loans_Recorded_Investment_of_I

Loans - Recorded Investment of Individual Loan Categories (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	$1,080,231	'	$1,188,466	'	'	'
Net loans	1,062,383	'	1,170,196	'	'	'
Interest Due	3,151	'	3,517	'	'	'
Deferred Fees / (Costs)	1,188	'	2,251	'	'	'
Recorded Investment	1,066,722	'	1,175,964	'	'	'
Allowance for loan losses	-17,848	-18,880	-18,270	-18,568	-18,374	-18,882
Commercial [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	498,824	'	459,558	'	'	'
Interest Due	1,172	'	1,369	'	'	'
Deferred Fees / (Costs)	760	'	913	'	'	'
Recorded Investment	500,756	'	461,840	'	'	'
Real Estate [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	302,436	'	440,579	'	'	'
Interest Due	1,064	'	1,058	'	'	'
Deferred Fees / (Costs)	409	'	583	'	'	'
Recorded Investment	303,909	'	442,220	'	'	'
Consumer [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	278,971	'	288,329	'	'	'
Interest Due	915	'	1,090	'	'	'
Deferred Fees / (Costs)	19	'	755	'	'	'
Recorded Investment	279,905	'	290,174	'	'	'
Loan Receivable [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	1,080,231	'	1,188,466	'	'	'
Interest Due	3,151	'	3,517	'	'	'
Deferred Fees / (Costs)	1,188	'	2,251	'	'	'
Recorded Investment	1,084,570	'	1,194,234	'	'	'
Owner Occupied Real Estate [Member] | Commercial [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	153,113	'	162,694	'	'	'
Interest Due	226	'	503	'	'	'
Deferred Fees / (Costs)	212	'	485	'	'	'
Recorded Investment	153,551	'	163,682	'	'	'
Non Owner Occupied Real Estate [Member] | Commercial [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	229,654	'	201,763	'	'	'
Interest Due	175	'	467	'	'	'
Deferred Fees / (Costs)	430	'	276	'	'	'
Recorded Investment	230,259	'	202,506	'	'	'
Residential Spec Homes [Member] | Commercial [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	242	'	1,056	'	'	'
Interest Due	'	'	8	'	'	'
Deferred Fees / (Costs)	'	'	'	'	'	'
Recorded Investment	242	'	1,064	'	'	'
Development & Spec Land Loans [Member] | Commercial [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	15,621	'	6,963	'	'	'
Interest Due	39	'	11	'	'	'
Deferred Fees / (Costs)	43	'	'	'	'	'
Recorded Investment	15,703	'	6,974	'	'	'
Commercial and Industrial [Member] | Commercial [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	100,194	'	87,082	'	'	'
Interest Due	732	'	380	'	'	'
Deferred Fees / (Costs)	75	'	152	'	'	'
Recorded Investment	101,001	'	87,614	'	'	'
Residential mortgage [Member] | Real Estate [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	179,964	'	181,450	'	'	'
Interest Due	567	'	565	'	'	'
Deferred Fees / (Costs)	409	'	583	'	'	'
Recorded Investment	180,940	'	182,598	'	'	'
Residential Construction [Member] | Real Estate [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	8,881	'	7,681	'	'	'
Interest Due	17	'	13	'	'	'
Deferred Fees / (Costs)	'	'	'	'	'	'
Recorded Investment	8,898	'	7,694	'	'	'
Mortgage Warehouse [Member] | Real Estate [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	113,591	'	251,448	'	'	'
Interest Due	480	'	480	'	'	'
Deferred Fees / (Costs)	'	'	'	'	'	'
Recorded Investment	114,071	'	251,928	'	'	'
Direct Installment [Member] | Consumer [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	28,968	'	27,831	'	'	'
Interest Due	92	'	115	'	'	'
Deferred Fees / (Costs)	-278	'	-204	'	'	'
Recorded Investment	28,782	'	27,742	'	'	'
Direct Installment Purchased [Member] | Consumer [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	331	'	429	'	'	'
Interest Due	'	'	'	'	'	'
Deferred Fees / (Costs)	'	'	'	'	'	'
Recorded Investment	331	'	429	'	'	'
Indirect Installment [Member] | Consumer [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	129,450	'	133,481	'	'	'
Interest Due	306	'	370	'	'	'
Deferred Fees / (Costs)	'	'	'	'	'	'
Recorded Investment	129,756	'	133,851	'	'	'
Home Equity [Member] | Consumer [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loan Balance	120,222	'	126,588	'	'	'
Interest Due	517	'	605	'	'	'
Deferred Fees / (Costs)	297	'	959	'	'	'
Recorded Investment	$121,036	'	$128,152	'	'	'

Allowance_for_Loan_Losses_Addi

Allowance for Loan Losses - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Scenario, Actual [Member]	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'
Actual loss history experienced by the Company	'5 years
Maximum [Member]	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'
Actual loss history experienced by the Company	'5 years
Allowance for loan losses charge down family first and junior lien mortgages past due period	'180 days
Allowance for loan losses charge down unsecured open end loans past due period	'90 days
Allowance for loan losses charge down other secured loans past due period	'90 days
Minimum [Member]	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'
Actual loss history experienced by the Company	'1 year

Allowance_for_Loan_Losses_Allo

Allowance for Loan Losses - Allowance for Loan Losses (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Balance at beginning of the period	$18,880	$18,374	$18,270	$18,882
Total loans charged-off	1,520	1,167	4,780	3,396
Total loan recoveries	384	320	1,440	1,273
Net loans charged-off	1,136	847	3,340	2,123
Total provision charged to operating expense	104	1,041	2,917	1,809
Balance at the end of the period	17,848	18,568	17,848	18,568
Commercial [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	756	394	1,998	752
Total loan recoveries	151	61	347	473
Total provision charged to operating expense	741	625	1,543	320
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	'	92	138	95
Total loan recoveries	15	'	61	352
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	539	81	730	109
Total loan recoveries	35	'	38	7
Commercial [Member] | Residential Development [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	'	'	'	'
Total loan recoveries	'	'	'	'
Commercial [Member] | Development & Spec Land Loans [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	182	'	182	'
Total loan recoveries	'	'	'	'
Commercial [Member] | Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	35	221	948	548
Total loan recoveries	101	61	248	114
Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	43	247	602	451
Total loan recoveries	3	42	11	74
Total provision charged to operating expense	-381	254	606	900
Real Estate [Member] | Residential mortgage [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	43	247	602	451
Total loan recoveries	3	42	11	74
Real Estate [Member] | Residential Construction [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	'	'	'	'
Total loan recoveries	'	'	'	'
Real Estate [Member] | Mortgage Warehouse [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	'	'	'	'
Total loan recoveries	'	'	'	'
Consumer [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	722	526	2,180	2,193
Total loan recoveries	230	217	1,082	726
Total provision charged to operating expense	-256	162	769	589
Consumer [Member] | Direct Installment [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	87	90	282	261
Total loan recoveries	10	28	458	63
Consumer [Member] | Direct Installment Purchased [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	'	'	'	'
Total loan recoveries	'	'	'	'
Consumer [Member] | Indirect Installment [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	329	313	953	922
Total loan recoveries	157	173	529	563
Consumer [Member] | Home Equity [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Total loans charged-off	306	123	945	1,010
Total loan recoveries	$63	$16	$95	$100

Allowance_for_Loan_Losses_Allo1

Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Total ending allowance balance	$17,848	$18,880	$18,270	$18,568	$18,374	$18,882
Total ending loans balance	7,919	'	'	12,904	'	'
Allowance for Loan Losses [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance For Loan Losses, Individually evaluated for impairment	1,316	'	1,945	'	'	'
Allowance For Loan Losses, Collectively evaluated for impairment	16,532	'	16,325	'	'	'
Total ending allowance balance	17,848	'	18,270	'	'	'
Loans [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Loans: Individually evaluated for impairment	7,919	'	10,597	'	'	'
Loans: Collectively evaluated for impairment	1,076,651	'	1,183,637	'	'	'
Total ending loans balance	1,084,570	'	1,194,234	'	'	'
Commercial [Member] | Allowance for Loan Losses [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance For Loan Losses, Individually evaluated for impairment	1,316	'	1,945	'	'	'
Allowance For Loan Losses, Collectively evaluated for impairment	6,347	'	5,826	'	'	'
Total ending allowance balance	7,663	'	7,771	'	'	'
Commercial [Member] | Loans [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Loans: Individually evaluated for impairment	7,919	'	10,597	'	'	'
Loans: Collectively evaluated for impairment	492,837	'	451,243	'	'	'
Total ending loans balance	500,756	'	461,840	'	'	'
Real Estate [Member] | Allowance for Loan Losses [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance For Loan Losses, Individually evaluated for impairment	'	'	'	'	'	'
Allowance For Loan Losses, Collectively evaluated for impairment	3,238	'	3,204	'	'	'
Total ending allowance balance	3,238	'	3,204	'	'	'
Real Estate [Member] | Loans [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Loans: Individually evaluated for impairment	'	'	'	'	'	'
Loans: Collectively evaluated for impairment	189,838	'	190,292	'	'	'
Total ending loans balance	189,838	'	190,292	'	'	'
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance For Loan Losses, Individually evaluated for impairment	'	'	'	'	'	'
Allowance For Loan Losses, Collectively evaluated for impairment	1,686	'	1,705	'	'	'
Total ending allowance balance	1,686	'	1,705	'	'	'
Mortgage Warehousing [Member] | Loans [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Loans: Individually evaluated for impairment	'	'	'	'	'	'
Loans: Collectively evaluated for impairment	114,071	'	251,928	'	'	'
Total ending loans balance	114,071	'	251,928	'	'	'
Consumer [Member] | Allowance for Loan Losses [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance For Loan Losses, Individually evaluated for impairment	'	'	'	'	'	'
Allowance For Loan Losses, Collectively evaluated for impairment	5,261	'	5,590	'	'	'
Total ending allowance balance	5,261	'	5,590	'	'	'
Consumer [Member] | Loans [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Loans: Individually evaluated for impairment	'	'	'	'	'	'
Loans: Collectively evaluated for impairment	279,905	'	290,174	'	'	'
Total ending loans balance	$279,905	'	$290,174	'	'	'

Nonperforming_Loans_and_Impair2

Non-performing Loans and Impaired Loans - Nonaccrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	$12,986	$13,374
Loans Past Due Over 90 Days Still Accruing	2	54
Non Performing TDR's	5,986	6,649
Performing TDR's	3,507	3,702
Total Non-Performing Loans	22,481	23,779
Commercial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	5,416	5,754
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	1,688	3,674
Performing TDR's	783	1,265
Total Non-Performing Loans	7,887	10,693
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	464	2,800
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	82	1,272
Performing TDR's	783	819
Total Non-Performing Loans	1,329	4,891
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	2,829	1,705
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	825	1,605
Performing TDR's	'	446
Total Non-Performing Loans	3,654	3,756
Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	'	'
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	'	'
Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	170	705
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	170	705
Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	1,953	544
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	781	797
Performing TDR's	'	'
Total Non-Performing Loans	2,734	1,341
Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	3,436	4,565
Loans Past Due Over 90 Days Still Accruing	2	2
Non Performing TDR's	2,977	2,827
Performing TDR's	1,678	1,761
Total Non-Performing Loans	8,093	9,155
Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	3,436	4,565
Loans Past Due Over 90 Days Still Accruing	2	2
Non Performing TDR's	2,693	2,536
Performing TDR's	1,678	1,761
Total Non-Performing Loans	7,809	8,864
Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	'	'
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	284	291
Performing TDR's	'	'
Total Non-Performing Loans	284	291
Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	'	'
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	'	'
Real Estate [Member] | Mortgage Warehousing [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	'	'
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	'	'
Consumer [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	4,134	3,055
Loans Past Due Over 90 Days Still Accruing	'	52
Non Performing TDR's	1,321	148
Performing TDR's	1,046	676
Total Non-Performing Loans	6,501	3,931
Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	249	138
Loans Past Due Over 90 Days Still Accruing	'	26
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	249	164
Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	'	'
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	'	'
Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	657	866
Loans Past Due Over 90 Days Still Accruing	'	26
Non Performing TDR's	'	'
Performing TDR's	'	'
Total Non-Performing Loans	657	892
Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Nonaccrual	3,228	2,051
Loans Past Due Over 90 Days Still Accruing	'	'
Non Performing TDR's	1,321	148
Performing TDR's	1,046	676
Total Non-Performing Loans	$5,595	$2,875

Nonperforming_Loans_and_Impair3

Non-performing Loans and Impaired Loans - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
	Contract
	ConsecutivePayment
Financing Receivable, Modifications [Line Items]	'	'
Non-accrual loans	$12,986,000	$13,374,000
Non-performing TDR's	6,000,000	'
Loans acquired included in non-accrual loans	1,600,000	'
Loans acquired included in non-performing TDR's	857,000	'
Loan delinquent period	'90 days	'
Minimum period required for satisfactory performance before returning to accrual status	'9 months	'
Restructured loans with modified recorded balances	0	'
Restructured loan returned to accruing status number of Consecutive Payments of loan	9	'
Restructured loan reported in TDRs	9,500,000	'
Specific reserves allocated to troubled debt restructuring	440,000,000,000	'
Number TDR's returned to accrual status	0	'
Loans with an aggregate credit exposure	500,000	'
Loans classified as TDR after a period	'90 days	'
Performing Financing Receivable [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Restructured loan	$3,500,000	'
Good Pass [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating	'5 years	'
Number of years of Satisfactory Relationship with bank for Good Pass Rating	'5 years	'
Minimum [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Delay or shortfall in payments of loan	'30 days	'
Period for loans moved to non accrual status	'90 days	'
Minimum [Member] | Good Pass [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of consecutive years of profit for Good Pass Rating	'3 years	'
Minimum [Member] | Satisfactory Pass [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating	'2 years	'

Nonperforming_Loans_and_Impair4

Non-performing Loans and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
	Defaults	Defaults
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	18,000	7,000
Unpaid Principal Balance	$3,163	$2,691
Commercial [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	3,000	6,000
Unpaid Principal Balance	149	2,109
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	2,000	3,000
Unpaid Principal Balance	81	1,472
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	1,000	3,000
Unpaid Principal Balance	68	637
Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Real Estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	8,000	1,000
Unpaid Principal Balance	1,132	582
Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	8,000	1,000
Unpaid Principal Balance	1,132	582
Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Real Estate [Member] | Mortgage Warehousing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	7,000	'
Unpaid Principal Balance	1,882	'
Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Defaults	7,000	'
Unpaid Principal Balance	$1,882	'

Nonperforming_Loans_and_Impair5

Non-performing Loans and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans Nonaccrual (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
	Defaults	Defaults
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	11,000	7,000
Unpaid Principal Balance	$1,724	$2,411
Commercial [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	3,000	5,000
Unpaid Principal Balance	149	1,734
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	2,000	3,000
Unpaid Principal Balance	81	1,473
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	1,000	2,000
Unpaid Principal Balance	68	261
Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Real Estate [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	4,000	2,000
Unpaid Principal Balance	400	677
Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	4,000	2,000
Unpaid Principal Balance	400	677
Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Real Estate [Member] | Mortgage Warehousing [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	4,000	'
Unpaid Principal Balance	1,175	'
Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	'	'
Unpaid Principal Balance	'	'
Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable Modifications Number Of Contracts [Line Items]	'	'
Number of Defaults	4,000	'
Unpaid Principal Balance	$1,175	'

Nonperforming_Loans_and_Impair6

Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance total	$7,887	$12,865	$7,887	$12,865
Total ending loans balance	7,919	12,904	7,919	12,904
Allowance For Loan Loss Allocated	1,316	2,403	1,316	2,403
Average Balance in Impaired Loans total	10,136	12,044	9,794	9,346
Cash/Accrual Interest Income Recognized, Total	24	70	87	82
Commercial [Member]	'	'	'	'
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance With no recorded allowance	5,063	7,565	5,063	7,565
Recorded Investment With no recorded allowance	5,083	7,604	5,083	7,604
Allowance For Loan Loss Allocated With no recorded allowance	'	'	'	'
Average Balance in Impaired Loans With no recorded allowance	7,094	6,730	7,319	4,064
Cash/Accrual Interest Income Recognized, With no recorded allowance	24	70	64	75
Unpaid Principal Balance With an allowance recorded	2,824	5,300	2,824	5,300
Recorded Investment With an allowance recorded	2,836	5,300	2,836	5,300
Allowance For Loan Loss Allocated	1,316	2,403	1,316	2,403
Average Balance in Impaired Loans With an allowance recorded	3,042	5,314	2,475	5,282
Cash/Accrual Interest Income Recognized, With an allowance recorded	'	'	23	7
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'	'	'
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance With no recorded allowance	1,329	4,457	1,329	4,457
Recorded Investment With no recorded allowance	1,331	4,460	1,331	4,460
Allowance For Loan Loss Allocated With no recorded allowance	'	'	'	'
Average Balance in Impaired Loans With no recorded allowance	1,959	3,810	2,685	1,978
Cash/Accrual Interest Income Recognized, With no recorded allowance	16	'	43	3
Unpaid Principal Balance With an allowance recorded	'	903	'	903
Recorded Investment With an allowance recorded	'	903	'	903
Allowance For Loan Loss Allocated	'	450	'	450
Average Balance in Impaired Loans With an allowance recorded	-1	910	'	1,109
Cash/Accrual Interest Income Recognized, With an allowance recorded	'	'	'	1
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'	'	'
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance With no recorded allowance	3,167	2,521	3,167	2,521
Recorded Investment With no recorded allowance	3,170	2,542	3,170	2,542
Allowance For Loan Loss Allocated With no recorded allowance	'	'	'	'
Average Balance in Impaired Loans With no recorded allowance	3,814	2,429	3,298	1,920
Cash/Accrual Interest Income Recognized, With no recorded allowance	8	70	21	72
Unpaid Principal Balance With an allowance recorded	487	2,938	487	2,938
Recorded Investment With an allowance recorded	487	2,938	487	2,938
Allowance For Loan Loss Allocated	302	1,065	302	1,065
Average Balance in Impaired Loans With an allowance recorded	491	2,943	502	2,843
Cash/Accrual Interest Income Recognized, With an allowance recorded	'	'	'	'
Commercial [Member] | Residential Development [Member]	'	'	'	'
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance With no recorded allowance	'	'	'	'
Recorded Investment With no recorded allowance	'	'	'	'
Allowance For Loan Loss Allocated With no recorded allowance	'	'	'	'
Average Balance in Impaired Loans With no recorded allowance	'	'	'	'
Cash/Accrual Interest Income Recognized, With no recorded allowance	'	'	'	'
Unpaid Principal Balance With an allowance recorded	'	'	'	'
Recorded Investment With an allowance recorded	'	'	'	'
Allowance For Loan Loss Allocated	'	'	'	'
Average Balance in Impaired Loans With an allowance recorded	'	'	'	'
Cash/Accrual Interest Income Recognized, With an allowance recorded	'	'	'	'
Commercial [Member] | Development & Spec Land Loans [Member]	'	'	'	'
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance With no recorded allowance	21	131	21	131
Recorded Investment With no recorded allowance	21	131	21	131
Allowance For Loan Loss Allocated With no recorded allowance	'	'	'	'
Average Balance in Impaired Loans With no recorded allowance	24	109	25	37
Cash/Accrual Interest Income Recognized, With no recorded allowance	'	'	'	'
Unpaid Principal Balance With an allowance recorded	149	658	149	658
Recorded Investment With an allowance recorded	149	658	149	658
Allowance For Loan Loss Allocated	48	615	48	615
Average Balance in Impaired Loans With an allowance recorded	173	660	165	523
Cash/Accrual Interest Income Recognized, With an allowance recorded	'	'	'	6
Commercial [Member] | Commercial and Industrial [Member]	'	'	'	'
Schedule Of Financial Receivables [Line Items]	'	'	'	'
Unpaid Principal Balance With no recorded allowance	546	456	546	456
Recorded Investment With no recorded allowance	561	471	561	471
Allowance For Loan Loss Allocated With no recorded allowance	'	'	'	'
Average Balance in Impaired Loans With no recorded allowance	1,297	382	1,311	129
Cash/Accrual Interest Income Recognized, With no recorded allowance	'	'	'	'
Unpaid Principal Balance With an allowance recorded	2,188	801	2,188	801
Recorded Investment With an allowance recorded	2,200	801	2,200	801
Allowance For Loan Loss Allocated	966	273	966	273
Average Balance in Impaired Loans With an allowance recorded	2,379	801	1,808	807
Cash/Accrual Interest Income Recognized, With an allowance recorded	'	'	$23	'

Nonperforming_Loans_and_Impair7

Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	$2,041	$5,998
60 - 89 Days Past Due	651	744
Greater than 90 Days Past Due	2	54
Total Past Due	2,694	6,796
Loans Not Past Due	1,077,537	1,181,670
Total	1,080,231	1,188,466
30 - 59 Days Past Due, Percentage of Total Loans	0.19%	0.50%
60 - 89 Days Past Due, Percentage of Total Loans	0.06%	0.06%
Greater than 90 Days Past Due, Percentage of Total Loans	0.00%	0.00%
Total Past Due, Percentage of Total Loans	0.25%	0.57%
Loans Not Past Due, Percentage of Total Loans	99.75%	99.43%
Commercial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	157	3,414
60 - 89 Days Past Due	'	182
Greater than 90 Days Past Due	'	'
Total Past Due	157	3,596
Loans Not Past Due	498,667	455,962
Total	498,824	459,558
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	99	2,207
60 - 89 Days Past Due	'	19
Greater than 90 Days Past Due	'	'
Total Past Due	99	2,226
Loans Not Past Due	153,014	160,468
Total	153,113	162,694
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	45	669
60 - 89 Days Past Due	'	147
Greater than 90 Days Past Due	'	'
Total Past Due	45	816
Loans Not Past Due	229,609	200,947
Total	229,654	201,763
Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	'	'
60 - 89 Days Past Due	'	'
Greater than 90 Days Past Due	'	'
Total Past Due	'	'
Loans Not Past Due	242	1,056
Total	242	1,056
Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	'	'
60 - 89 Days Past Due	'	'
Greater than 90 Days Past Due	'	'
Total Past Due	'	'
Loans Not Past Due	15,621	6,963
Total	15,621	6,963
Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	13	538
60 - 89 Days Past Due	'	16
Greater than 90 Days Past Due	'	'
Total Past Due	13	554
Loans Not Past Due	100,181	86,528
Total	100,194	87,082
Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	695	167
60 - 89 Days Past Due	351	'
Greater than 90 Days Past Due	2	2
Total Past Due	1,048	169
Loans Not Past Due	301,388	440,410
Total	302,436	440,579
Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	695	167
60 - 89 Days Past Due	351	'
Greater than 90 Days Past Due	2	2
Total Past Due	1,048	169
Loans Not Past Due	178,916	181,281
Total	179,964	181,450
Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	'	'
60 - 89 Days Past Due	'	'
Greater than 90 Days Past Due	'	'
Total Past Due	'	'
Loans Not Past Due	8,881	7,681
Total	8,881	7,681
Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	'	'
60 - 89 Days Past Due	'	'
Greater than 90 Days Past Due	'	'
Total Past Due	'	'
Loans Not Past Due	113,591	251,448
Total	113,591	251,448
Consumer [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	1,189	2,417
60 - 89 Days Past Due	300	562
Greater than 90 Days Past Due	'	52
Total Past Due	1,489	3,031
Loans Not Past Due	277,482	285,298
Total	278,971	288,329
Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	122	240
60 - 89 Days Past Due	13	64
Greater than 90 Days Past Due	'	26
Total Past Due	135	330
Loans Not Past Due	28,833	27,501
Total	28,968	27,831
Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	'	'
60 - 89 Days Past Due	'	'
Greater than 90 Days Past Due	'	'
Total Past Due	'	'
Loans Not Past Due	331	429
Total	331	429
Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	894	1,105
60 - 89 Days Past Due	60	177
Greater than 90 Days Past Due	'	26
Total Past Due	954	1,308
Loans Not Past Due	128,496	132,173
Total	129,450	133,481
Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30 - 59 Days Past Due	173	1,072
60 - 89 Days Past Due	227	321
Greater than 90 Days Past Due	'	'
Total Past Due	400	1,393
Loans Not Past Due	119,822	125,195
Total	$120,222	$126,588

Nonperforming_Loans_and_Impair8

Non-performing Loans and Impaired Loans - Loans by Credit Grades (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	$1,080,231	$1,188,466
Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	498,824	459,558
Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	153,113	162,694
Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	229,654	201,763
Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	242	1,056
Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	15,621	6,963
Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	100,194	87,082
Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	302,436	440,579
Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	179,964	181,450
Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	8,881	7,681
Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	113,591	251,448
Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	278,971	288,329
Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	28,968	27,831
Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	331	429
Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	129,450	133,481
Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	120,222	126,588
Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	1,024,587	1,107,191
Percentage of total loans	94.85%	93.16%
Pass [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	457,775	391,369
Pass [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	142,836	137,664
Pass [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	210,632	171,319
Pass [Member] | Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	242	405
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	13,844	3,171
Pass [Member] | Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	90,221	78,810
Pass [Member] | Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	294,343	431,424
Pass [Member] | Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	172,155	172,586
Pass [Member] | Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	8,597	7,390
Pass [Member] | Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	113,591	251,448
Pass [Member] | Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	272,470	284,398
Pass [Member] | Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	28,719	27,667
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	331	429
Pass [Member] | Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	128,793	132,589
Pass [Member] | Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	114,627	123,713
Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	11,223	29,161
Percentage of total loans	1.04%	2.45%
Special Mention [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	11,223	29,161
Special Mention [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	2,600	6,407
Special Mention [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	3,119	19,440
Special Mention [Member] | Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	94	178
Special Mention [Member] | Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	5,410	3,136
Special Mention [Member] | Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Special Mention [Member] | Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	44,420	50,233
Percentage of total loans	4.11%	4.23%
Substandard [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	29,826	37,147
Substandard [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	7,677	17,029
Substandard [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	15,903	10,717
Substandard [Member] | Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	651
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	1,683	3,614
Substandard [Member] | Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	4,563	5,136
Substandard [Member] | Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	8,093	9,155
Substandard [Member] | Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	7,809	8,864
Substandard [Member] | Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	284	291
Substandard [Member] | Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Substandard [Member] | Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	6,501	3,931
Substandard [Member] | Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	249	164
Substandard [Member] | Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	657	892
Substandard [Member] | Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	5,595	2,875
Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	1,881
Percentage of total loans	0.00%	0.16%
Doubtful [Member] | Commercial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	1,881
Doubtful [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	1,594
Doubtful [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	287
Doubtful [Member] | Commercial [Member] | Residential Development [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Commercial [Member] | Development & Spec Land Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Commercial [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Real Estate [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Real Estate [Member] | Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Real Estate [Member] | Mortgage Warehouse [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Consumer [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Consumer [Member] | Direct Installment Purchased [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Consumer [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'
Doubtful [Member] | Consumer [Member] | Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	'	'

Recovered_Sheet1

Derivative Financial Instruments - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
		Cash Flow Hedging [Member]	Derivative in Fair Value Hedging Relationship [Member]	Derivative in Fair Value Hedging Relationship [Member]
Derivative [Line Items]	'	'	'	'
LIBOR period	'3 months	'	'	'
Weighted average fixed rate	6.14%	'	'	'
Notional amount of interest	'	$30.50	$90.30	$81
Recorded period of effectiveness of cash flow hedges on net income	'12 months	'	'	'
Recorded period of effectiveness of fair value hedges on net income	'12 months	'	'	'
Recorded period of effectiveness of fair value of derivatives on net income	'12 months	'	'	'

Recovered_Sheet2

Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Asset Derivative	$1,198	$3,072
Total Liability Derivative	4,014	7,707
Derivatives Designated as Hedging Instruments [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Asset Derivative	579	2,214
Total Liability Derivative	4,014	7,707
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Loans [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Asset Derivative	23	279
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Liabilities [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Liability Derivative	579	2,214
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Assets [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Asset Derivative	556	1,935
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Liabilities [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Liability Derivative	3,435	5,493
Derivatives Not Designated as Hedging Instruments [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Asset Derivative	619	858
Total Liability Derivative	'	'
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Assets [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Asset Derivative	619	858
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Liabilities [Member]	'	'
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]	'	'
Total Liability Derivative	'	'

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Effect of the Derivative Instruments on the Consolidated Statement of Income Derivative in Cash Flow Hedging Relationship (Detail) (Cash Flow Hedging [Member], Interest Rate Contracts One [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cash Flow Hedging [Member] | Interest Rate Contracts One [Member]	'	'	'	'
Derivative Instruments and Hedging Activities Disclosures [Line Items]	'	'	'	'
Comprehensive Income on Derivative (Effective Portion)	$25	($169)	$1,338	($588)

Derivative_Financial_Instrumen3

Derivative Financial Instruments - Effect of the Derivative Instruments on the Consolidated Statement of Income Derivative in Fair Value Hedging Relationship (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative in Fair Value Hedging Relationship [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Location of (gain) loss recognized on derivative	'	'	'	'
Interest Income - Loans [Member] | Derivative in Fair Value Hedging Relationship [Member] | Interest Rate Contracts One [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Location of (gain) loss recognized on derivative	211	112	-1,635	336
Interest Income - Loans [Member] | Derivative in Fair Value Hedging Relationship [Member] | Interest Rate Contracts Two [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Location of (gain) loss recognized on derivative	-211	-112	1,635	-336
Derivatives Not Designated as Hedging Instruments [Member] | Other income - Gain on Sale of Loans [Member] | Mortgage Loan Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Location of (gain) loss recognized on derivative	$169	$320	($239)	$600

Disclosures_about_fair_value_o2

Disclosures about fair value of assets and liabilities - Fair Value Measurements of Assets and Liabilities Recognized on a Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	$514,144	$482,801
Recurring Basis [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	514,144	482,801
Recurring Basis [Member] | U.S.Treasury and Federal Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	42,757	51,779
Recurring Basis [Member] | Municipal Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	179,517	172,905
Recurring Basis [Member] | Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	110,782	96,831
Recurring Basis [Member] | Federal Agency Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	179,194	159,204
Recurring Basis [Member] | Private Labeled Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	1,334	2,031
Recurring Basis [Member] | Corporate Notes [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	560	51
Recurring Basis [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 available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S.Treasury and Federal Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Municipal Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal Agency Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Private Labeled Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Notes [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	514,144	482,801
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S.Treasury and Federal Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	42,757	51,779
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	179,517	172,905
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	110,782	96,831
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	179,194	159,204
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private Labeled Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	1,334	2,031
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	560	51
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S.Treasury and Federal Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Municipal Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal Agency Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private Labeled Mortgage-Backed Pools [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Notes [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total available for sale securities, Fair Value	'	'
Hedged Loans [Member] | Recurring Basis [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	89,718	81,018
Hedged Loans [Member] | Recurring Basis [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]	'	'
Available-for-sale securities	'	'
Hedged Loans [Member] | Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	89,718	81,018
Hedged Loans [Member] | Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	'	'
Forward Sale Commitments [Member] | Recurring Basis [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	619	858
Forward Sale Commitments [Member] | Recurring Basis [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]	'	'
Available-for-sale securities	'	'
Forward Sale Commitments [Member] | Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	619	858
Forward Sale Commitments [Member] | Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	'	'
Interest Rate Swap Agreements [Member] | Recurring Basis [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	-4,014	-7,707
Interest Rate Swap Agreements [Member] | Recurring Basis [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]	'	'
Available-for-sale securities	'	'
Interest Rate Swap Agreements [Member] | Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	-4,014	-7,707
Interest Rate Swap Agreements [Member] | Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	'	'
Commitments to Originate Loans [Member] | Recurring Basis [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	'	'
Commitments to Originate Loans [Member] | Recurring Basis [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]	'	'
Available-for-sale securities	'	'
Commitments to Originate Loans [Member] | Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	'	'
Commitments to Originate Loans [Member] | Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale securities	'	'

Recovered_Sheet3

Disclosures about Fair Value of Assets an Liabilities - Schedule of Fair Value Transfer Among Levels (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Reason for Transfer (a)	'Valuation determined by widely accepted techniques including discounted cash flow analysis on expected cash flows of each derivative and observable market rate inputs such as yield curves and contractual terms on each instrument.
Reason for Transfer (b)	'Valuation determined by quoted prices for similar loans in the secondary market with an expected fallout rate (interest rate locked pipeline loans not expected to close). Fallout rate is not considered a significant input to the fair value in its entirety.
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Significant Other Observable Inputs (Level 2) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	53,886
Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Hedged Loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	-59,911
Hedged Loans [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Hedged Loans [Member] | Significant Other Observable Inputs (Level 2) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	59,911
Hedged Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Forward Sale Commitments [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	-510
Forward Sale Commitments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Forward Sale Commitments [Member] | Significant Other Observable Inputs (Level 2) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	510
Forward Sale Commitments [Member] | Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Interest Rate Swap Agreements [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	6,464
Interest Rate Swap Agreements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Interest Rate Swap Agreements [Member] | Significant Other Observable Inputs (Level 2) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	-6,464
Interest Rate Swap Agreements [Member] | Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Commitments to Originate Loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	71
Commitments to Originate Loans [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'
Commitments to Originate Loans [Member] | Significant Other Observable Inputs (Level 2) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	-71
Commitments to Originate Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Transfers out to Level 1, 2, and 3	'

Recovered_Sheet4

Disclosures about Fair Value of Assets and Liabilities - Reconciliation of the Beginning and Ending Balances of Recurring Fair Value Measurements Recognized in the Accompanying Condensed Consolidated Balance Sheet Using Significant Unobservable (Level 3) Inputs (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012
Hedged Loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Beginning balance	$54,362
Included in net income	-74
Purchases, issuances, and settlements	6,114
Principal payments	-491
Transfers out to Level 2	-59,911
Ending balance	'
Forward Sale Commitments [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Beginning balance	662
Included in net income	-152
Transfers out to Level 2	-510
Ending balance	'
Interest Rate Swap Agreements [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Beginning balance	-7,101
Included in net income	74
Included in other comprehensive income, gross	563
Transfers out to Level 2	6,464
Ending balance	'
Commitments to Originate Loans [Member]	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'
Included in net income	-71
Transfers out to Level 2	71
Ending balance	'

Recovered_Sheet5

Disclosures about Fair Value of Assets and Liabilities - Realized Gains and Losses included in Net Income for the Periods in the Condensed Consolidated Statements of Income (Detail) (USD $)

12 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Hedged Loans [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Non Interest Income [Member]

Hedged Loans [Member]

Hedged Loans [Member]

Hedged Loans [Member]

Hedged Loans [Member]

Fair Value Interest Rate Swap Agreements [Member]

Fair Value Interest Rate Swap Agreements [Member]

Fair Value Interest Rate Swap Agreements [Member]

Fair Value Interest Rate Swap Agreements [Member]

Derivative Loan Commitments [Member]

Derivative Loan Commitments [Member]

Derivative Loan Commitments [Member]

Derivative Loan Commitments [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Included in net income

$74

$169

$320

($239)

$600

$211

$112

($1,635)

$336

($211)

($112)

$1,635

($336)

$169

$320

($239)

$600

Disclosures_about_Fair_Value_o3

Disclosures about Fair Value of Assets and Liabilities - Other Assets Measured at Fair Value on a Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans	$6,571	$8,652
Mortgage servicing rights	6,302	5,145
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans	'	'
Mortgage servicing rights	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans	'	'
Mortgage servicing rights	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans	6,571	8,652
Mortgage servicing rights	$6,302	$5,145

Disclosures_about_Fair_Value_o4

Disclosures about Fair Value of Assets and Liabilities - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'	'	'
Fair value adjustments on impaired loans	$1,300,000	'	$1,900,000
Increase in carrying amount of mortgage servicing rights	$208,000	$369,000	'

Disclosures_about_Fair_Value_o5

Disclosures about Fair Value of Assets and Liabilities - Qualitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements, Other than Goodwill (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Impaired Loans [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Fair Value	$6,571	$8,652
Valuation Technique	'Collateral based measurement	'Collateral based measurement
Unobservable Inputs	'Discount to reflect current market conditions and ultimate collectability	'Discount to reflect current market conditions and ultimate collectability
Mortgage Servicing Rights [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Fair Value	$6,302	$5,145
Valuation Technique	'Discounted cashflows	'Discounted cashflows
Unobservable Inputs	'Discount rate, Constant prepayment rate, Probably of default	'Discount rate, Constant prepayment rate, Probably of default
Minimum [Member] | Impaired Loans [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Discount to reflect current market conditions and ultimate collectability	10.00%	10.00%
Minimum [Member] | Mortgage Servicing Rights [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Discount rate	10.00%	10.00%
Constant prepayment rate	4.00%	4.00%
Probably of default	1.00%	1.00%
Maximum [Member] | Impaired Loans [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Discount to reflect current market conditions and ultimate collectability	15.00%	15.00%
Maximum [Member] | Mortgage Servicing Rights [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Discount rate	15.00%	15.00%
Constant prepayment rate	7.00%	7.00%
Probably of default	10.00%	10.00%
Weighted Average [Member] | Impaired Loans [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Discount to reflect current market conditions and ultimate collectability	12.00%	12.00%
Weighted Average [Member] | Mortgage Servicing Rights [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Discount rate	12.00%	12.00%
Constant prepayment rate	4.60%	4.60%
Probably of default	4.50%	4.50%

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Summary of Estimated Fair Values of the Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'	'
Cash and due from banks	$40,500	$30,735
Investment securities, held to maturity	9,910	'
Loans held for sale	4,594	13,744
Interest receivable	7,506	7,716
Liabilities	'	'
Non-interest bearing deposits	223,354	209,200
Interest payable	488	560
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets	'	'
Cash and due from banks	40,500	30,735
Investment securities, held to maturity	'	'
Loans held for sale	'	'
Loans excluding loan level hedges, net	'	'
Stock in FHLB and FRB	'	'
Interest receivable	'	'
Liabilities	'	'
Non-interest bearing deposits	223,354	209,200
Interest-bearing deposits	'	'
Borrowings	'	'
Subordinated debentures	'	'
Interest payable	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets	'	'
Cash and due from banks	'	'
Investment securities, held to maturity	'	'
Loans held for sale	'	'
Loans excluding loan level hedges, net	'	'
Stock in FHLB and FRB	14,184	13,333
Interest receivable	7,506	7,716
Liabilities	'	'
Non-interest bearing deposits	'	'
Interest-bearing deposits	1,060,853	1,092,184
Borrowings	245,043	352,891
Subordinated debentures	32,483	32,268
Interest payable	488	560
Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets	'	'
Cash and due from banks	'	'
Investment securities, held to maturity	9,910	'
Loans held for sale	4,594	13,744
Loans excluding loan level hedges, net	996,408	1,118,255
Stock in FHLB and FRB	'	'
Interest receivable	'	'
Liabilities	'	'
Non-interest bearing deposits	'	'
Interest-bearing deposits	'	'
Borrowings	'	'
Subordinated debentures	'	'
Interest payable	'	'
Carrying Amount [Member]	'	'
Assets	'	'
Cash and due from banks	40,500	30,735
Investment securities, held to maturity	9,910	'
Loans held for sale	4,594	13,744
Loans excluding loan level hedges, net	973,300	1,089,215
Stock in FHLB and FRB	14,184	13,333
Interest receivable	7,506	7,716
Liabilities	'	'
Non-interest bearing deposits	223,354	209,200
Interest-bearing deposits	1,104,966	1,084,953
Borrowings	242,505	345,764
Subordinated debentures	32,448	32,331
Interest payable	$488	$560

Other_Comprehensive_Income_Com

Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning Balance	$9,101	$7,842
Other comprehensive income (loss) before reclassifications	-8,293	2,359
Amounts reclassified from other comprehensive income	-243	'
Period change	-8,536	2,359
Ending Balance	565	10,201
Unrealized Gains (Losses) on Securities Available-for-Sale [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning Balance	12,671	11,036
Other comprehensive income (loss) before reclassifications	-9,631	2,947
Amounts reclassified from other comprehensive income	-243	'
Period change	-9,874	2,947
Ending Balance	2,797	13,983
Unrealized Gains (Losses) on Derivative Instruments [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Beginning Balance	-3,570	-3,194
Other comprehensive income (loss) before reclassifications	1,338	-588
Period change	1,338	-588
Ending Balance	($2,232)	($3,782)

Other_Comprehensive_Income_Com1

Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Federal and state income tax rate	35.00%

Other_Comprehensive_Income_Det

Other Comprehensive Income - Details about Accumulated Other Comprehensive Income Components (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Gain on sale of investment securities	$6	$2	$374	$2
Income tax expense	-1,629	-1,978	-5,960	-6,248
Net Income	4,785	4,850	15,761	14,373
Net of tax	4,785	4,850	15,761	14,373
Securities Available-for-sale [Member] | Reclassification from Accumulated Other Comprehensive Income [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Gain on sale of investment securities	6	'	374	'
Income tax expense	-2	'	-131	'
Net Income	4	'	243	'
Net of tax	$4	'	$243	'