Lakeland Bancorp (LBAI) 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 30, 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	'LAKELAND BANCORP INC	'
Entity Central Index Key	'0000846901	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	35,832,759

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS:	'	'
Cash	$130,035	$100,926
Interest-bearing deposits due from banks	15,219	6,619
Total cash and cash equivalents	145,254	107,545
Investment securities available for sale, at fair value	418,562	393,710
Investment securities held to maturity; fair value of $96,196 at September 30, 2013 and $99,784 at December 31, 2012	96,702	96,925
Federal Home Loan Bank Stock, at cost	5,965	5,382
Loans held for sale	901	'
Loans, net of deferred costs (fees)	2,427,684	2,146,843
Less: allowance for loan and lease losses	29,757	28,931
Net loans	2,397,927	2,117,912
Premises and equipment, net	37,351	33,280
Accrued interest receivable	8,173	7,643
Goodwill	110,381	87,111
Other identifiable intangible assets	2,548	'
Bank owned life insurance	55,534	46,143
Other assets	20,002	23,052
TOTAL ASSETS	3,299,300	2,918,703
Deposits:	'	'
Noninterest bearing	623,562	498,066
Savings and interest-bearing transaction accounts	1,770,299	1,569,139
Time deposits under $100 thousand	190,996	188,278
Time deposits $100 thousand and over	123,597	115,514
Total deposits	2,708,454	2,370,997
Federal funds purchased and securities sold under agreements to repurchase	110,525	117,289
Other borrowings	75,000	85,000
Subordinated debentures	42,548	51,548
Other liabilities	15,248	13,002
TOTAL LIABILITIES	2,951,775	2,637,836
STOCKHOLDERS' EQUITY	'	'
Common stock, no par value; authorized shares, 70,000,000; issued 35,823,147 shares at September 30, 2013 and 29,941,967 shares at December 31, 2012	362,549	303,794
Accumulated deficit	-13,192	-24,145
Treasury stock, at cost, 0 shares at September 30, 2013 and 216,077 at December 31, 2012	'	-2,718
Accumulated other comprehensive (loss) gain	-1,832	3,936
TOTAL STOCKHOLDERS' EQUITY	347,525	280,867
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$3,299,300	$2,918,703

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Investment securities held to maturity; fair value	$96,196	$99,784
Common stock, par value	'	'
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	35,823,147	29,941,967
Treasury stock, shares	0	216,077

Consolidated_Statements_of_Inc

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, leases and fees	$27,350	$24,929	$77,122	$75,659
Federal funds sold and interest-bearing deposits with banks	27	17	57	29
Taxable investment securities and other	2,017	2,121	5,544	6,668
Tax-exempt investment securities	461	428	1,331	1,371
TOTAL INTEREST INCOME	29,855	27,495	84,054	83,727
INTEREST EXPENSE	'	'	'	'
Deposits	1,518	2,026	4,740	6,421
Federal funds purchased and securities sold under agreements to repurchase	14	12	36	68
Other borrowings	836	1,802	2,709	5,889
TOTAL INTEREST EXPENSE	2,368	3,840	7,485	12,378
NET INTEREST INCOME	27,487	23,655	76,569	71,349
Provision for loan and lease losses	1,879	3,350	7,656	11,783
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	25,608	20,305	68,913	59,566
NONINTEREST INCOME	'	'	'	'
Service charges on deposit accounts	2,838	2,757	8,052	7,914
Commissions and fees	1,139	1,162	3,495	3,401
Gains on sales of investment securities	'	'	506	273
Gain on debt extinguishment	'	'	1,197	'
Income on bank owned life insurance	383	357	1,036	1,035
Other income	285	364	1,203	845
TOTAL NONINTEREST INCOME	4,645	4,640	15,489	13,468
NONINTEREST EXPENSE	'	'	'	'
Salaries and employee benefits	11,019	9,578	31,105	28,578
Net occupancy expense	2,060	1,807	5,921	5,131
Furniture and equipment	1,582	1,205	4,492	3,427
Stationery, supplies and postage	348	388	1,086	1,079
Marketing expense	715	718	1,438	1,646
FDIC insurance expense	436	519	1,505	1,620
Legal expense	406	135	934	880
Expenses on other real estate owned and other repossessed assets	-2	13	15	89
Long term debt prepayment fee	'	'	526	'
Merger related expenses	744	'	2,827	'
Core deposit intangible amortization	123	'	164	'
Other expenses	2,976	2,605	8,014	7,263
TOTAL NONINTEREST EXPENSE	20,407	16,968	58,027	49,713
Income before provision for income taxes	9,846	7,977	26,375	23,321
Income tax expense	3,229	2,488	8,747	7,408
NET INCOME	6,617	5,489	17,628	15,913
Dividends on Preferred Stock and Accretion	'	'	'	620
Net Income Available to Common Stockholders	$6,617	$5,489	$17,628	$15,293
PER SHARE OF COMMON STOCK	'	'	'	'
Basic earnings	$0.18	$0.20	$0.54	$0.56
Diluted earnings	$0.18	$0.20	$0.54	$0.56
Dividends	$0.07	$0.06	$0.21	$0.18

Consolidated_Statements_of_Com

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	$6,617	$5,489	$17,628	$15,913
OTHER COMPREHENSIVE INCOME, NET OF TAX:	'	'	'	'
Unrealized securities gains (losses) during period	1,118	1,220	-5,454	2,174
Reclassification for gains included in net income	0	0	-329	-177
Change in pension liability, net	5	5	15	15
Other Comprehensive Income (Loss)	1,123	1,225	-5,768	2,012
TOTAL COMPREHENSIVE INCOME (LOSS)	$7,740	$6,714	$11,860	$17,925

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common stock [Member]	Accumulated deficit [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands, except Share data
BALANCE at Dec. 31, 2012	$280,867	$303,794	($24,145)	($2,718)	$3,936
BALANCE, Shares at Dec. 31, 2012	'	29,941,967	'	'	'
NET INCOME	17,628	'	17,628	'	'
Other comprehensive loss, net of tax	-5,768	'	'	'	-5,768
Stock based compensation	669	669	'	'	'
Issuance of restricted stock awards	'	-1,301	'	1,301	'
Issuance of stock for acquisition	57,419	57,419	'	'	'
Issuance of stock for acquisition, Shares	'	5,794,079	'	'	'
Issuance of stock options for acquisition	1,603	1,603	'	'	'
Issuance of stock to dividend reinvestment and stock purchase plan	145	108	-901	938	'
Issuance of stock to dividend reinvestment and stock purchase plan, Shares	'	27,270	'	'	'
Exercise of stock options, net of excess tax benefits	736	257	'	479	'
Exercise of stock options, net of excess tax benefits, Shares	98,895	59,831	'	'	'
Cash dividends, common stock	-5,774	'	-5,774	'	'
BALANCE at Sep. 30, 2013	$347,525	$362,549	($13,192)	'	($1,832)
BALANCE, Shares at Sep. 30, 2013	'	35,823,147	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
NET INCOME	$17,628	$15,913
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Net amortization of premiums, discounts and deferred loan fees and costs	3,695	4,616
Depreciation and amortization	2,770	2,229
Provision for loan and lease losses	7,656	11,783
Loans originated for sale	-27,125	'
Proceeds from sales of loans	29,368	'
Gains on securities	-506	-273
Gain on early debt extinguishment	-1,197	'
Gains on sales of loans held for sale	-612	'
Gains on leases	'	-365
Gains on sales of other real estate and other repossessed assets	-277	-240
Gains on sales of premises and equipment	-68	-2
Stock-based compensation	669	559
Decrease in other assets	7,837	1,131
Increase in other liabilities	468	2,171
NET CASH PROVIDED BY OPERATING ACTIVITIES	40,306	37,522
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash acquired in acquisition	74,316	'
Proceeds from repayments on and maturity of securities:	'	'
Available for sale	55,913	87,327
Held to maturity	20,397	24,640
Proceeds from sales of securities	'	'
Available for sale	53,670	53,718
Purchase of securities:	'	'
Available for sale	-144,004	-97,545
Held to maturity	-11,768	-49,066
Net (increase) decrease in Federal Home Loan Bank Stock	-90	2,484
Net increase in loans and leases	-47,537	-35,403
Proceeds from sales of other real estate and repossessed assets	1,751	1,299
Capital expenditures	-1,986	-7,549
Proceeds from sales of bank premises and equipment	462	2
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	1,124	-20,093
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net increase in deposits	25,739	91,455
Decrease in federal funds purchased and securities sold under agreements to repurchase	-6,764	-17,550
Proceeds from other borrowings	'	280,000
Repayments of other borrowings	-10,000	-340,000
Early extinguishment of subordinated debentures	-7,803	'
Redemption of preferred stock and common stock warrant	'	-21,800
Proceeds from issuance of common stock, net of expenses	'	25,021
Excess tax benefits	27	18
Exercise of stock options	709	'
Issuance of stock to dividend reinvestment and stock purchase plan	145	141
Dividends paid	-5,774	-4,221
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	-3,721	13,064
Net increase in cash and cash equivalents	37,709	30,493
Cash and cash equivalents, beginning of period	107,545	72,558
CASH AND CASH EQUIVALENTS, END OF PERIOD	$145,254	$103,051

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Note 1. Significant Accounting Policies
	Basis of Presentation.
	This quarterly report presents the consolidated financial statements of Lakeland Bancorp, Inc. (the Company) and its subsidiary, Lakeland Bank (Lakeland). The accounting and reporting policies of the Company conform with accounting principles generally accepted in the United States of America (U.S. GAAP) and predominant practices within the banking industry.
	The Company’s unaudited interim financial statements reflect all adjustments, such as normal recurring accruals that are, in the opinion of management, necessary for the fair presentation of the results of the interim periods. The results of operations for the quarter presented do not necessarily indicate the results that the Company will achieve for all of 2013. You should read these interim financial statements in conjunction with the audited consolidated financial statements and accompanying notes that are presented in the Lakeland Bancorp, Inc. Annual Report on Form 10-K for the year ended December 31, 2012.
	On May 31, 2013, the Company completed its acquisition of Somerset Hills Bancorp (“Somerset Hills”). For more information, see Note 14 below.
	The financial information in this quarterly report has been prepared in accordance with the Company’s customary accounting practices. Certain information and footnote disclosures required under U.S. GAAP have been condensed or omitted, as permitted by rules and regulations of the Securities and Exchange Commission.
	All weighted average, actual share and per share information set forth in this Quarterly Report on Form 10-Q have been adjusted retroactively for the effects of stock dividends.
	Certain reclassifications have been made to prior period financial statements to conform to the 2013 presentation.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	Note 2. Stock-Based Compensation
	Share-based compensation expense of $669,000 and $559,000 was recognized for the nine months ended September 30, 2013 and 2012, respectively. As of September 30, 2013, there was unrecognized compensation cost of $1.6 million related to unvested restricted stock; that cost is expected to be recognized over a weighted average period of approximately 2.9 years. Unrecognized compensation expense related to unvested stock options was approximately $138,000 as of September 30, 2013 and is expected to be recognized over a period of 2.5 years.
	In the first nine months of 2013, the Company granted 104,182 shares of restricted stock at an average grant date fair value of $9.88 per share under the Company’s 2009 equity compensation program. These shares vest over a five year period. Compensation expense on these shares is expected to average approximately $206,000 per year for the next five years. In the first nine months of 2012, the Company granted 91,269 shares of restricted stock at a grant date fair value of $9.50 per share under the 2009 program. Compensation expense on these shares is expected to average approximately $173,000 per year over a five year period.
	On May 31, 2013, the Company granted options to purchase 50,000 shares to two new non-employee directors of the Company at an exercise price of $9.91 per share under the 2009 program. Each director’s options are exercisable in five equal installments beginning at the date of grant and continuing on the next four anniversaries of the grant date. The fair value of these options were estimated using the Black-Scholes option pricing model with the following weighted average assumptions:
	Risk-free interest rates		1.55	%
	Expected dividend yield		2.82	%
	Expected volatility		45.45	%
	Expected lives (years)		7
	Weighted average fair value of options granted	$	3.48
	There were no grants of stock options in the first nine months of 2012.
	The Company also assumed the outstanding options granted under Somerset Hills’ stock option plans at the time of merger. Based on the conversion ratio in the merger, the Company assumed options to purchase 376,372 shares of Lakeland stock in these plans at a weighted average exercise price of $6.65.
	Option activity under the Company’s stock option plans is as follows:
							Weighted
							average
					Weighted		remaining
					average		contractual
		Number of			exercise		term		Aggregate
		shares			price		( in years)		intrinsic value
	Outstanding, January 1, 2013		475,697		$	12.31			$	53,853
	Issued		426,372			7.03
	Exercised		(98,895	)		7.18
	Forfeited		(7,826	)		12.93
	Outstanding, September 30, 2013		795,348		$	10.11		2.88	$	1,504,444
	Options exercisable at
	September 30, 2013		749,835		$	10.14		2.49	$	1,434,088
	The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the Company’s closing stock price on the last trading day of the first nine months of 2013 and the exercise price, multiplied by the number of in-the-money options).
	The aggregate intrinsic value of stock options exercised during the nine months ended September 30, 2013 was $391,000. Exercise of stock options during the first nine months of 2013 resulted in cash receipts of $709,000.
	Information regarding the Company’s restricted stock (all unvested) and changes during the nine months ended September 30, 2013 is as follows:
					Weighted
		Number of			average
		shares			price
	Outstanding, January 1, 2013		222,556		$	9.15
	Granted		104,182			9.88
	Vested		(65,782	)		8.6
	Forfeited		(2,711	)		9.26
	Outstanding, September 30, 2013		258,245		$	9.58

Comprehensive_Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Comprehensive Income	'
	Note 3. Comprehensive Income
	The components of other comprehensive income are as follows:
			September 30, 2013									September 30, 2012
	For the quarter ended:		Before tax			Tax Benefit			Net of			Before tax			Tax Benefit			Net of tax
			amount			(Expense)			tax amount			amount			(Expense)			amount
			(in thousands)									(in thousands)
	Net unrealized gains on available for sale securities
	Net unrealized holding gains arising during period		$	1,765		($	647	)	$	1,118		$	1,933		($	713	)	$	1,220
	Reclassification adjustment for net gains arising during the period			—			—			—			—			—			—
	Net unrealized gains		$	1,765		($	647	)	$	1,118		$	1,933		($	713	)	$	1,220
	Change in minimum pension liability			8			(3	)		5			8			(3	)		5
	Other comprehensive income, net		$	1,773		($	650	)	$	1,123		$	1,941		($	716	)	$	1,225
	For the nine months ended:		Before tax			Tax Benefit			Net of			Before tax			Tax Benefit			Net of tax
			amount			(Expense)			tax amount			amount			(Expense)			amount
			(in thousands)									(in thousands)
	Net unrealized gains (losses) on available for sale securities
	Net unrealized holding gains (losses) arising during period		($	8,635	)	$	3,181		($	5,454	)	$	3,441		($	1,267	)	$	2,174
	Reclassification adjustment for net gains arising during the period			(506	)		177			(329	)		(273	)		96			(177	)
	Net unrealized gains (losses)		($	9,141	)	$	3,358		($	5,783	)	$	3,168		($	1,171	)	$	1,997
	Change in minimum pension liability			23			(8	)		15			23			(8	)		15
	Other comprehensive income (loss), net		($	9,118	)	$	3,350		($	5,768	)	$	3,191		($	1,179	)	$	2,012
	The following table shows the changes in the balances of each of the components of other comprehensive income for the periods presented:
	Changes in Accumulated Other Comprehensive Income by Component (a)
			For the Three Months Ended									For the Three Months Ended
			September 30, 2013									September 30, 2012
			Unrealized Gains			Pension Items			Total			Unrealized Gains			Pension Items			Total
			and Losses on									and Losses on
			Available-for-sale									Available-for-sale
			Securities									Securities
	Beginning Balance		($	2,348	)	($	607	)	($	2,955	)	$	4,283		($	625	)	$	3,658
			(in thousands)
	Other comprehensive income before classifications			1,118			5			1,123			1,220			5			1,225
	Amounts reclassified from accumulated other comprehensive income			—			—			—			—			—			—
	Net current period other comprehensive income			1,118			5			1,123			1,220			5			1,225
	Ending balance		($	1,230	)	($	602	)	($	1,832	)	$	5,503		($	620	)	$	4,883
	(a)	All amounts are net of tax.
	Changes in Accumulated Other Comprehensive Income by Component (a)
			For the Nine Months Ended									For the Nine Months Ended
			September 30, 2013									September 30, 2012
			Unrealized Gains			Pension Items			Total			Unrealized Gains			Pension Items			Total
			and Losses on									and Losses on
			Available-for-sale									Available-for-sale
			Securities									Securities
	Beginning Balance		$	4,553		($	617	)	$	3,936		$	3,506		($	635	)	$	2,871
			(in thousands)
	Other comprehensive income (loss) before classifications			(5,454	)		15			(5,439	)		2,174			15			2,189
	Amounts reclassified from accumulated other comprehensive income			(329	)		—			(329	)		(177	)		—			(177	)
	Net current period other comprehensive income (loss)			(5,783	)		15			(5,768	)		1,997			15			2,012
	Ending balance		($	1,230	)	($	602	)	($	1,832	)	$	5,503		($	620	)	$	4,883
	(a)	All amounts are net of tax.

Statement_of_Cash_Flow_Informa

Statement of Cash Flow Information, Supplemental Information	9 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Elements [Abstract]	'
Statement of Cash Flow Information, Supplemental Information	'
	Note 4. Statement of Cash Flow Information, Supplemental Information
		For the Nine Months Ended
		September 30,
		2013		2012
		(in thousands)
	Supplemental schedule of noncash investing and financing activities:
	Cash paid during the period for income taxes	$	8,497	$	6,467
	Cash paid during the period for interest		7,750		12,504
	Transfer of loans and leases into other repossessed assets and other real estate owned		3,098		651

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Note 5. Earnings Per Share
	The following schedule shows the Company’s earnings per share for the periods presented:
		For the Three Months Ended				For the Nine Months Ended
		September 30,				September 30,
	(In thousands, except per share data)	2013		2012		2013		2012
	Net income available to common shareholders	$	6,617	$	5,489	$	17,628	$	15,293
	Less: earnings allocated to participating securities		48		49		125		134
	Net income allocated to common shareholders	$	6,569	$	5,440	$	17,503	$	15,159
	Weighted average number of common shares outstanding—basic		35,512		27,550		32,223		26,998
	Share-based plans		224		92		131		67
	Weighted average number of common shares—diluted		35,736		27,642		32,354		27,065
	Basic earnings per share	$	0.18	$	0.2	$	0.54	$	0.56
	Diluted earnings per share	$	0.18	$	0.2	$	0.54	$	0.56
	Options to purchase 461,366 shares of common stock at a weighted average price of $12.41 per share were outstanding and were not included in the computation of diluted earnings per share for the quarter ended September 30, 2013 because the exercise price was greater than the average market price. Options to purchase 569,222 shares of common stock at a weighted average price of $12.79 were outstanding and were not included in the computation of diluted earnings per share for the quarter ended September 30, 2012 because the exercise price was greater than the average market price.
	Options to purchase 490,307 shares of common stock at a weighted average price of $12.29 per share were outstanding and were not included in the computation of diluted earnings per share for the nine months ended September 30, 2013 because the exercise price was greater than the average market price. Options to purchase 569,222 shares of common stock at a weighted average price of $12.79 were outstanding and were not included in the computation of diluted earnings per share for the nine months ended September 30, 2012 because the exercise price was greater than the average market price.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	Note 6. Investment Securities
	AVAILABLE FOR SALE		September 30, 2013										December 31, 2012
			Amortized		Gross		Gross			Fair Value			Amortized		Gross		Gross			Fair Value
			Cost		Unrealized		Unrealized						Cost		Unrealized		Unrealized
					Gains		Losses								Gains		Losses
			(in thousands)										(in thousands)
	U.S. treasury and U.S. government agencies		$	62,117	$	—	$	(1,953	)	$	60,164		$	86,002	$	577	$	(8	)	$	86,571
	Mortgage-backed securities, residential			291,961		3,031		(3,994	)		290,998			235,052		5,086		(579	)		239,559
	Obligations of states and political subdivisions			37,210		922		(441	)		37,691			36,848		1,832		(60	)		38,620
	Other debt securities			13,560		59		(215	)		13,404			13,576		189		(321	)		13,444
	Equity securities			15,607		991		(293	)		16,305			14,984		608		(76	)		15,516
			$	420,455	$	5,003	$	(6,896	)	$	418,562		$	386,462	$	8,292	$	(1,044	)	$	393,710
	HELD TO MATURITY		September 30, 2013										December 31, 2012
			Amortized		Gross		Gross			Fair Value			Amortized		Gross		Gross			Fair Value
			Cost		Unrealized		Unrealized						Cost		Unrealized		Unrealized
					Gains		Losses								Gains		Losses
			(in thousands)										(in thousands)
	U.S. government agencies		$	15,989	$	63	$	(326	)	$	15,726		$	16,089	$	385	$	—		$	16,474
	Mortgage-backed securities, residential			36,081		569		(753	)		35,897			39,065		1,313		(27	)		40,351
	Mortgage-backed securities, multifamily			2,380		—		(159	)		2,221			1,421		—		(13	)		1,408
	Obligations of states and political subdivisions			40,710		594		(658	)		40,646			38,801		1,068		(68	)		39,801
	Other debt securities			1,542		164		—			1,706			1,549		201		—			1,750
			$	96,702	$	1,390	$	(1,896	)	$	96,196		$	96,925	$	2,967	$	(108	)	$	99,784
	The following table shows investment securities by stated maturity. Securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay, and are, therefore, classified separately with no specific maturity date (in thousands):
			September 30, 2013
			Available for Sale				Held to Maturity
			Amortized		Fair Value		Amortized			Fair Value
			Cost				Cost
	Due in one year or less		$	5,848	$	5,896	$	6,065		$	6,096
	Due after one year through five years			36,066		36,365		14,046			14,619
	Due after five years through ten years			68,169		66,502		30,659			30,206
	Due after ten years			2,804		2,496		7,471			7,157
				112,887		111,259		58,241			58,078
	Mortgage-backed securities			291,961		290,998		38,461			38,118
	Equity securities			15,607		16,305		—			—
	Total securities		$	420,455	$	418,562	$	96,702		$	96,196
	The following table shows proceeds from sales of securities, gross gains and gross losses on sales or calls of securities and other than temporary impairments for the periods indicated (in thousands):
			For the Three Months Ended				For the Nine Months Ended
			September 30,				September 30,
			2013		2012		2013			2012
	Sale proceeds		$	—	$	—	$	53,670		$	53,718
	Gross gains			—		—		509			584
	Gross losses			—		—		(3	)		(311	)
	Gains or losses on sales of investment securities are based on the net proceeds and the adjusted carrying amount of the securities sold using the specific identification method.
	Securities with a carrying value of approximately $334.5 million and $328.4 million at September 30, 2013 and December 31, 2012, respectively, were pledged to secure public deposits and for other purposes required by applicable laws and regulations.
	The following table indicates the length of time individual securities have been in a continuous unrealized loss position at September 30, 2013 and December 31, 2012:
	September 30, 2013		Less than 12 months				12 months or longer						Total
	AVAILABLE FOR SALE		Fair value		Unrealized		Fair value			Unrealized			Number of		Fair value		Unrealized
					Losses					Losses			securities				Losses
							(dollars in thousands)
	U.S. treasury and U.S. government agencies		$	60,164	$	1,953	$	—		$	—			13	$	60,164	$	1,953
	Mortgage-backed securities, residential			129,802		3,734		6,251			260			35		136,053		3,994
	Obligations of states and political subdivisions			6,122		298		1,585			143			15		7,707		441
	Other debt securities			—		—		5,764			215			2		5,764		215
	Equity securities			9,996		272		225			21			3		10,221		293
			$	206,084	$	6,257	$	13,825		$	639			68	$	219,909	$	6,896
	HELD TO MATURITY
	U.S. government agencies		$	10,658	$	326	$	—		$	—			2	$	10,658	$	326
	Mortgage-backed securities, residential			22,325		753		—			—			9		22,325		753
	Mortgage-backed securities, multifamily			2,221		159		—			—			2		2,221		159
	Obligations of states and political subdivisions			14,453		654		351			4			44		14,804		658
			$	49,657	$	1,892	$	351		$	4			57	$	50,008	$	1,896
	December 31, 2012		Less than 12 months				12 months or longer						Total
AVAILABLE FOR SALE		Fair value		Unrealized		Fair value			Unrealized			Number of		Fair value		Unrealized
				Losses					Losses			securities				Losses
		(dollars in thousands)
U.S. government agencies		$	3,992	$	8	$	—		$	—			1	$	3,992	$	8
Mortgage-backed securities, residential			30,359		572		3,239			7			10		33,598		579
Obligations of states and political subdivisions			2,825		60		—			—			7		2,825		60
Other debt securities			—		—		5,661			321			2		5,661		321
Equity securities			4,621		76		—			—			2		4,621		76
		$	41,797	$	716	$	8,900		$	328			22	$	50,697	$	1,044
HELD TO MATURITY
Mortgage-backed securities, residential		$	1,239	$	27	$	—		$	—			1	$	1,239	$	27
Mortgage-backed securities, multifamily			1,408		13		—			—			1		1,408		13
Obligations of states and political subdivisions			3,705		63		371			5			10		4,076		68
		$	6,352	$	103	$	371		$	5			12	$	6,723	$	108
Management has evaluated the securities in the above table and has concluded that none of the securities with unrealized losses have impairments that are other-than-temporary. Fair value below cost is due to interest rate movements and is deemed temporary. All investment securities are evaluated on a periodic basis to determine if factors are identified that would require further analysis. In evaluating the Company’s securities, management considers the following items:
	•		The Company’s ability and intent to hold the securities, including an evaluation of the need to sell the security to meet certain liquidity measures, or whether the Company has sufficient levels of cash to hold the identified security in order to recover the entire amortized cost of the security;
	•		The financial condition of the underlying issuer;
	•		The credit ratings of the underlying issuer and if any changes in the credit rating have occurred;
	•		The length of time the security’s fair value has been less than amortized cost; and
	•		Adverse conditions related to the security or its issuer if the issuer has failed to make scheduled payments or other factors.
If the above factors indicate that additional analysis is required, management will consider the results of discounted cash flow analysis.
As of September 30, 2013, the equity securities include investments in other financial institutions for market appreciation purposes. Those equities had a net amortized cost of $2.4 million and a market value of $3.4 million as of September 30, 2013.
As of September 30, 2013, equity securities also included $12.9 million in investment funds that do not have a quoted market price but use net asset value per share or its equivalent to measure fair value.
The funds include $2.9 million in funds that are primarily invested in community development loans that are guaranteed by the Small Business Administration (SBA). Because the funds are primarily guaranteed by the federal government there are minimal changes in market value between accounting periods. These funds can be redeemed within 60 days notice at the net asset value less unpaid management fees with the approval of the fund manager. As of September 30, 2013, the net amortized cost equaled the market value of the investment. There are no unfunded commitments related to this investment.
The funds also include $10.0 million in funds that are invested in government guaranteed loans, mortgage-backed securities, small business loans and other instruments supporting affordable housing and economic development. The Company may redeem these funds at the net asset value calculated at the end of the current business day less any unpaid management fees. As of September 30, 2013, the amortized cost of these securities was $10.3 million and the fair value was $10.0 million. There are no restrictions on redemptions for the holdings in these investments other than the notice required by the fund manager. There are no unfunded commitments related to this investment.

Loans_and_Leases

Loans and Leases	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Loans and Leases	'
	Note 7. Loans and Leases.
	The following sets forth the composition of Lakeland’s loan and lease portfolio as of September 30, 2013 and December 31, 2012:
			September 30,			December 31,
			2013			2012
			(in thousands)
	Commercial, secured by real estate		$	1,348,314		$	1,125,137
	Commercial, industrial and other			214,877			216,129
	Leases			37,845			26,781
	Real estate-residential mortgage			437,788			423,262
	Real estate-construction			50,121			46,272
	Home equity and consumer			339,805			309,626
	Total loans			2,428,750			2,147,207
	Plus: deferred fees			(1,066	)		(364	)
	Loans, net of deferred fees		$	2,427,684		$	2,146,843
	At September 30, 2013 and December 31, 2012, home equity and consumer loans included overdraft deposit balances of $381,000 and $532,000, respectively. At September 30, 2013 and December 31, 2012, the Company had $273.3 million and $203.1 million in residential loans pledged for potential borrowings at the Federal Home Loan Bank of New York (FHLB).
	The carrying value of loans acquired and accounted for in accordance with ASC Subtopic 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality,” was $1.6 million at September 30, 2013, which was substantially the same as the balance at the acquisition date of May 31, 2013. Under ASC Subtopic 310-30, loans may be aggregated and accounted for as pools of loans if the loans being aggregated have common risk characteristics. The Company elected to account for the loans with evidence of credit deterioration individually rather than aggregate them into pools. The difference between the undiscounted cash flows expected at acquisition and the investment in the acquired loans, or the “accretable yield,” is recognized as interest income utilizing the level-yield method over the life of each loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “non-accretable difference,” are not recognized as a yield adjustment, as a loss accrual or as a valuation allowance.
	Increases in expected cash flows subsequent to the acquisition are recognized prospectively through an adjustment of the yield on the loans over the remaining life, while decreases in expected cash flows are recognized as impairment through a loss provision and an increase in the allowance for loan losses. Valuation allowances (recognized in the allowance for loan losses) on these impaired loans reflect only losses incurred after the acquisition (representing all cash flows that were expected at acquisition but currently are not expected to be received).
	There were no material increases or decreases in the expected cash flows between May 31, 2013 (the “acquisition date”) and September 30, 2013. The Company recognized $43,000 of interest income on the loans acquired.
	Non-Performing Assets and Past Due Loans
	The following schedule sets forth certain information regarding the Company’s non-performing assets and its accruing troubled debt restructurings:
			September 30,			December 31,
	(in thousands)		2013			2012
	Commercial, secured by real estate		$	6,585		$	10,511
	Commercial, industrial and other			184			1,476
	Leases			—			32
	Real estate—residential mortgage			5,996			8,733
	Real estate—construction			921			4,031
	Home equity and consumer			2,819			3,197
	Total non-accrual loans and leases		$	16,505		$	27,980
	Other real estate and other repossessed assets			2,154			529
	TOTAL NON-PERFORMING ASSETS		$	18,659		$	28,509
	Troubled debt restructurings, still accruing		$	11,006		$	7,336
	Non-accrual loans included $2.3 million and $3.4 million of troubled debt restructurings as of September 30, 2013 and December 31, 2012, respectively.
	An age analysis of past due loans, segregated by class of loans as of September 30, 2013 and December 31, 2012, is as follows:
			30-59 Days			60-89 Days			Greater			Total Past			Current			Total			Recorded
			Past Due			Past Due			Than			Due						Loans			Investment greater
									89 Days									and Leases			than 89 Days and
																					still accruing
			(in thousands)
	September 30, 2013
	Commercial, secured by real estate		$	9,075		$	3,783		$	7,222		$	20,080		$	1,328,234		$	1,348,314		$	637
	Commercial, industrial and other			191			571			192			954			213,923			214,877			8
	Leases			12			—			—			12			37,833			37,845			—
	Real estate—residential mortgage			3,261			1,085			6,942			11,288			426,500			437,788			946
	Real estate—construction			—			—			921			921			49,200			50,121			—
	Home equity and consumer			2,521			694			3,711			6,926			332,879			339,805			892
			$	15,060		$	6,133		$	18,988		$	40,181		$	2,388,569		$	2,428,750		$	2,483
	December 31, 2012
	Commercial, secured by real estate		$	3,831		$	2,308		$	10,511		$	16,650		$	1,108,487		$	1,125,137		$	—
	Commercial, industrial and other			400			171			1,476			2,047			214,082			216,129			—
	Leases			367			36			32			435			26,346			26,781			—
	Real estate—residential mortgage			2,370			821			10,012			13,203			410,059			423,262			1,279
	Real estate—construction			1,100			—			4,031			5,131			41,141			46,272			—
	Home equity and consumer			2,479			363			3,355			6,197			303,429			309,626			158
			$	10,547		$	3,699		$	29,417		$	43,663		$	2,103,544		$	2,147,207		$	1,437
	Impaired Loans
	Impaired loans as of September 30, 2013, September 30, 2012 and December 31, 2012 are as follows:
			Recorded			Contractual			Specific			Interest			Average
			Investment in			Unpaid			Allowance			Income			Investment in
			Impaired loans			Principal						Recognized			Impaired loans
						Balance
			(in thousands)
	September 30, 2013
Loans without specific allowance:
Commercial, secured by real estate		$	7,098		$	7,352		$	—		$	137		$	7,663
Commercial, industrial and other			4,037			4,002			—			142			4,428
Real estate-residential mortgage			—			—			—			—			—
Real estate-construction			—			—			—			—			1,328
Home equity and consumer			18			18			—			1			18
Loans with specific allowance:
Commercial, secured by real estate			11,769			12,890			1,044			298			11,024
Commercial, industrial and other			388			498			78			6			659
Real estate-residential mortgage			479			479			72			—			497
Real estate-construction			921			3,015			41			—			1,307
Home equity and consumer			1,351			1,351			203			33			1,292
Total:
Commercial, secured by real estate		$	18,867		$	20,242		$	1,044		$	435		$	18,687
Commercial, industrial and other			4,425			4,500			78			148			5,087
Real estate—residential mortgage			479			479			72			—			497
Real estate-construction			921			3,015			41			—			2,635
Home equity and consumer			1,369			1,369			203			34			1,310
		$	26,061		$	29,605		$	1,438		$	617		$	28,216
		Recorded			Contractual			Specific			Interest			Average
		Investment in			Unpaid			Allowance			Income			Investment in
		Impaired loans			Principal						Recognized			Impaired loans
					Balance
		(in thousands)
September 30, 2012
Loans without specific allowance:
Commercial, secured by real estate		$	14,263		$	18,253		$	—		$	260		$	15,605
Commercial, industrial and other			4,927			4,938			—			67			3,555
Real estate-residential mortgage			366			366			—			6			386
Real estate-construction			3,977			4,606			—			—			7,611
Home equity and consumer			350			350			—			—			337
Loans with specific allowance:
Commercial, secured by real estate			3,127			3,895			313			45			4,389
Commercial, industrial and other			787			902			216			—			641
Real estate-residential mortgage			288			288			43			4			384
Real estate-construction			120			997			12			—			331
Home equity and consumer			946			946			142			36			946
Total:
Commercial, secured by real estate		$	17,390		$	22,148		$	313		$	305		$	19,994
Commercial, industrial and other			5,714			5,840			216			67			4,196
Real estate—residential mortgage			654			654			43			10			770
Real estate-construction			4,097			5,603			12			—			7,942
Home equity and consumer			1,296			1,296			142			36			1,283
		$	29,151		$	35,541		$	726		$	418		$	34,185
		Recorded			Contractual			Specific			Interest			Average
		Investment in			Unpaid			Allowance			Income			Investment in
		Impaired loans			Principal						Recognized			Impaired loans
					Balance
		(in thousands)
December 31, 2012
Loans without specific allowance:
Commercial, secured by real estate		$	16,458		$	21,665		$	—		$	495		$	18,301
Commercial, industrial and other			4,896			4,932			—			116			3,838
Real estate-residential mortgage			360			360			—			6			385
Real estate-construction			3,332			4,433			—			—			5,533
Home equity and consumer			369			369			—			1			360
Loans with specific allowance:
Commercial, secured by real estate			3,346			4,088			368			46			3,825
Commercial, industrial and other			808			871			219			1			769
Real estate-residential mortgage			288			288			43			4			374
Real estate-construction			698			1,085			97			—			1,445
Home equity and consumer			976			976			146			55			934
Total:
Commercial, secured by real estate		$	19,804		$	25,753		$	368		$	541		$	22,126
Commercial, industrial and other			5,704			5,803			219			117			4,607
Real estate—residential mortgage			648			648			43			10			759
Real estate-construction			4,030			5,518			97			—			6,978
Home equity and consumer			1,345			1,345			146			56			1,294
		$	31,531		$	39,067		$	873		$	724		$	35,764
Interest that would have been accrued on impaired loans during the first nine months of 2013 and 2012 had the loans been performing under original terms would have been $1.7 million and $2.1 million, respectively. Interest that would have accrued for the year ended December 31, 2012 was $2.8 million.
Credit Quality Indicators
The primary credit quality indicator is an internal risk rating whereby management closely and continually monitors the quality of its loans and leases and assesses the quantitative and qualitative risks arising from the credit quality of its loans and leases. It is the policy of Lakeland to require that a Credit Risk Rating be assigned to all commercial loans and loan commitments. The Credit Risk Rating System has been developed by management to provide a methodology to be used by Loan Officers, department heads and Senior Management in identifying various levels of credit risk that exist within Lakeland’s loan portfolios. The risk rating system assists Senior Management in evaluating Lakeland’s commercial loan portfolio, analyzing trends, and determining the proper level of required reserves to be recommended to the Board. In assigning risk ratings, management considers, among other things, a borrower’s debt service coverage, earnings strength, loan to value ratios, industry conditions and economic conditions. Management categorizes loans and commitments into a one (1) to nine (9) numerical structure with rating 1 being the strongest rating and rating 9 being the weakest. Ratings 1 through 5W are considered ‘Pass’ ratings.
The following table shows the Company’s commercial loan portfolio as of September 30, 2013 and December 31, 2012, by the risk ratings discussed above (in thousands):
September 30, 2013
Risk Rating		Commercial,			Commercial,			Real estate-
		secured by			industrial			construction
		real estate			and other
1		$	—		$	774		$	—
2			—			16,089			—
3			71,453			9,822			—
4			420,190			57,793			—
5			733,677			87,859			46,515
5W—Watch			38,488			11,150			—
6—Other Assets Especially Mentioned			28,003			8,730			2,639
7—Substandard			56,418			22,660			967
8—Doubtful			85			—			—
9—Loss			—			—			—
Total		$	1,348,314		$	214,877		$	50,121
December 31, 2012
Risk Rating		Commercial,			Commercial,			Real estate-
		secured by			industrial			construction
		real estate			and other
1		$	—		$	996		$	—
2			—			12,899			—
3			44,448			15,676			—
4			350,145			62,676			795
5			623,912			88,033			34,682
5W—Watch			43,515			13,261			—
6—Other Assets Especially Mentioned			21,132			2,845			6,535
7—Substandard			41,817			19,743			4,260
8—Doubtful			168			—			—
9—Loss			—			—			—
Total		$	1,125,137		$	216,129		$	46,272
The risk rating tables above do not include consumer or residential loans or leases because the evaluation of their primary credit quality indicator is based on the loans’ payment performance status.
Allowance for Loan and Lease Losses
The following table details activity in the allowance for loan and lease losses by portfolio segment and the related recorded investment in loans and leases for the nine months ended September 30, 2013 and the year ended December 31, 2012:
Nine Months Ended September 30, 2013		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
Allowance for Loan and Lease Losses:		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Beginning Balance		$	16,258		$	5,103		$	578		$	3,568		$	587		$	2,837		$	28,931
Charge-offs			(1,192	)		(1,103	)		(206	)		(903	)		(3,652	)		(1,252	)	($	8,308	)
Recoveries			955			139			119			97			12			156		$	1,478
Provision			1,684			971			17			423			3,431			1,130		$	7,656
Ending Balance		$	17,705		$	5,110		$	508		$	3,185		$	378		$	2,871		$	29,757
Ending Balance: Individually evaluated for impairment		$	1,044		$	78		$	—		$	72		$	41		$	203		$	1,438
Ending Balance: Collectively evaluated for impairment			16,661			5,032			508			3,113			337			2,668		$	28,319
Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—			—
Ending Balance		$	17,705		$	5,110		$	508		$	3,185		$	378		$	2,871		$	29,757
Loans and Leases:
Ending Balance: Individually evaluated for impairment		$	18,867		$	4,425		$	—		$	479		$	921		$	1,369		$	26,061
Ending Balance: Collectively evaluated for impairment			1,328,185			210,452			37,845			437,309			49,200			338,066		$	2,401,057
Ending Balance: Loans acquired with deteriorated credit quality			1,262			—			—			—			—			370		$	1,632
Ending Balance (1)		$	1,348,314		$	214,877		$	37,845		$	437,788		$	50,121		$	339,805		$	2,428,750
-1	Excludes deferred fees
Year Ended December 31, 2012		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
Allowance for Loan and Lease Losses:		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Beginning Balance		$	16,618		$	3,477		$	688		$	3,077		$	1,424		$	3,132		$	28,416
Charge-offs			(7,287	)		(949	)		(999	)		(1,822	)		(2,888	)		(2,074	)	($	16,019	)
Recoveries			280			428			504			66			43			306		$	1,627
Provision			6,647			2,147			385			2,247			2,008			1,473		$	14,907
Ending Balance		$	16,258		$	5,103		$	578		$	3,568		$	587		$	2,837		$	28,931
Ending Balance: Individually evaluated for impairment		$	368		$	219		$	—		$	43		$	97		$	146		$	873
Ending Balance: Collectively evaluated for impairment			15,890			4,884			578			3,525			490			2,691		$	28,058
Ending Balance		$	16,258		$	5,103		$	578		$	3,568		$	587		$	2,837		$	28,931
Loans and Leases:
Ending Balance: Individually evaluated for impairment		$	19,804		$	5,704		$	—		$	648		$	4,030		$	1,345		$	31,531
Ending Balance: Collectively evaluated for impairment			1,105,333			210,425			26,781			422,614			42,242			308,281		$	2,115,676
Ending Balance(1)		$	1,125,137		$	216,129		$	26,781		$	423,262		$	46,272		$	309,626		$	2,147,207
-1	Excludes deferred fees
Lakeland also maintains a reserve for unfunded lending commitments which are included in other liabilities. This reserve was $1.1 million both at September 30, 2013 and December 31, 2012. The Company analyzes the adequacy of the reserve for unfunded lending commitments in conjunction with its analysis of the adequacy of the allowance for loan and lease losses. For more information on this analysis, see “Risk Elements” in Management’s Discussion and Analysis.
Troubled Debt Restructurings
Troubled debt restructurings are those loans where concessions have been made due to borrowers’ financial difficulties. Restructured loans typically involve a modification of terms such as a reduction of the stated interest rate, a moratorium of principal payments and/or an extension of the maturity date at a stated interest rate lower than the current market rate of a new loan with similar risk. The Company considers the potential losses on these loans as well as the remainder of its impaired loans while considering the adequacy of the allowance for loan and lease losses.
The following tables summarize loans that have been restructured during the three and nine months ended September 30, 2013 and 2012:
		For the Three Months Ended									For the Three Months Ended
		September 30, 2013									September 30, 2012
		Number of			Pre-			Post-			Number of			Pre-			Post-
		Contracts			Modification			Modification			Contracts			Modification			Modification
					Outstanding			Outstanding						Outstanding			Outstanding
					Recorded			Recorded						Recorded			Recorded
					Investment			Investment						Investment			Investment
		(Dollars in thousands)									(Dollars in thousands)
Troubled Debt Restructurings:
Commercial, secured by real estate			—		$	—		$	—			3		$	521		$	432
Commercial, industrial and other			—			—			—			2			56			52
Leases			—			—			—			—			—			—
Real estate—residential mortgage			—			—			—			—			—			—
Real estate—construction			—			—			—			—			—			—
Home equity and consumer			—			—			—			—			—			—
			—		$	—		$	—			5		$	577		$	484
		For the Nine Months Ended									For the Nine Months Ended
		September 30, 2013									September 30, 2012
		Number of			Pre-			Post-			Number of			Pre-			Post-
		Contracts			Modification			Modification			Contracts			Modification			Modification
					Outstanding			Outstanding						Outstanding			Outstanding
					Recorded			Recorded						Recorded			Recorded
					Investment			Investment						Investment			Investment
		(Dollars in thousands)									(Dollars in thousands)
Troubled Debt Restructurings:
Commercial, secured by real estate			11		$	5,472		$	5,468			8		$	1,524		$	1,407
Commercial, industrial and other			1			127			125			4			4,231			4,218
Leases			—			—			—			—			—			—
Real estate—residential mortgage			—			—			—			—			—			—
Real estate—construction			—			—			—			—			—			—
Home equity and consumer			1			11			11			—			—			—
			13		$	5,610		$	5,604			12		$	5,755		$	5,625
The following table summarizes as of September 30, 2013 and 2012, loans that were restructured within the last 12 months that have subsequently defaulted:
		For the Nine Months Ended
		September 30, 2013						September 30, 2012
		Number of			Recorded			Number of			Recorded
		Contracts			Investment			Contracts			Investment
		(Dollars in thousands)						(Dollars in thousands)
Defaulted Troubled Debt Restructurings:
Commercial, secured by real estate			5		$	3,084			2		$	267
Commercial, industrial and other			—			—			1			62
Leases			—			—			—			—
Real estate—residential mortgage			—			—			—			—
Real estate—construction			—			—			—			—
Home equity and consumer			—			—			—			—
			5		$	3,084			3		$	329
Mortgages Held for Sale
Residential mortgages originated by the bank and held for sale in the secondary market are carried at the lower of cost or fair market value. Fair value is generally determined by the value of purchase commitments. Losses are recorded as a valuation allowance and charged to earnings. As of September 30, 2013, the Company had $901,000 in mortgages held for sale.
Leases
Lakeland had no leases held for sale as of September 30, 2013 and December 31, 2012. The following table shows the components of gains on leasing related assets for the periods presented:
		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
		(in thousands)						(in thousands)
Gains (losses) on sales of leases		$	—		$	—		$	—		$	—
Realized gains on paid off leases			20			92			51			365
Gains on other repossessed assets			—			8			12			38
Total gains on leasing related assets		$	20		$	100		$	63		$	403
Other Real Estate and Other Repossessed Assets
At September 30, 2013, the Company had other repossessed assets and other real estate owned of $44,000 and $2.1 million, respectively. At December 31, 2012, the Company had other repossessed assets and other real estate owned of $77,000 and $452,000, respectively.

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	Note 8. Employee Benefit Plans
	The components of net periodic pension cost for the Newton Trust Company’s defined benefit pension plan are as follows:
		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
		(in thousands)						(in thousands)
	Interest cost	$	22		$	22		$	67		$	65
	Expected return on plan assets		(18	)		(19	)		(54	)		(57	)
	Amortization of unrecognized net actuarial loss		21			18			62			54
	Net periodic benefit expense	$	25		$	21		$	75		$	62

Directors_Retirement_Plan

Directors' Retirement Plan	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Directors' Retirement Plan	'
	Note 9. Directors’ Retirement Plan
	The components of net periodic plan costs for the directors’ retirement plan are as follows:
		For the Three Months Ended				For the Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(in thousands)				(in thousands)
	Service cost	$	8	$	8	$	22	$	23
	Interest cost		9		11		27		31
	Amortization of prior service cost		3		3		10		10
	Amortization of unrecognized net actuarial loss		2		3		6		9
	Net periodic benefit expense	$	22	$	25	$	65	$	73
	The Company made contributions of $75,000 and $88,000 to the plan during the nine month periods ended September 30, 2013 and 2012, respectively. The Company does not expect to make any more contributions for the remainder of 2013.

Estimated_Fair_Value_of_Financ

Estimated Fair Value of Financial Instruments and Fair Value Measurement	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Estimated Fair Value of Financial Instruments and Fair Value Measurement	'
	Note 10. Estimated Fair Value of Financial Instruments and Fair Value Measurement
	Fair Value Measurement
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for an asset or liability in an orderly transaction between market participants at the measurement date. U.S. GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels giving the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurements) and the lowest level priority to unobservable inputs (level 3 measurements). The following describes the three levels of fair value hierarchy:
	Level 1 – unadjusted quoted prices in active markets for identical assets or liabilities; includes U.S. Treasury Notes, and other U.S. Government Agency securities that actively trade in over-the-counter markets; equity securities and mutual funds that actively trade in over-the-counter markets.
	Level 2 – quoted prices for similar assets or liabilities in active markets; or quoted prices for identical or similar assets or liabilities in markets that are not active; or inputs other than quoted prices that are observable for the asset or liability including yield curves, volatilities, and prepayment speeds.
	Level 3 – unobservable inputs for the asset or liability that reflect the Company’s own assumptions about assumptions that market participants would use in the pricing of the asset or liability and that are consequently not based on market activity but upon particular valuation techniques.
	The Company’s assets that are measured at fair value on a recurring basis are its available for sale investment securities. The Company obtains fair values on its securities using information from a third party servicer. If quoted prices for securities are available in an active market, those securities are classified as Level 1 securities. The Company has U.S. Treasury Notes and certain equity securities that are classified as Level 1 securities. Level 2 securities were primarily comprised of U.S. Agency bonds, residential mortgage-backed securities, obligations of state and political subdivisions and corporate securities. Fair values were estimated primarily by obtaining quoted prices for similar assets in active markets or through the use of pricing models supported with market data information. Standard inputs include benchmark yields, reported trades, issuer spreads, bids and offers. On a quarterly basis, the Company reviews the pricing information received from the Company’s third party pricing service. This review includes a comparison to non-binding third-party quotes. As a result of our review, we did not have any adjustments to prices from our third party servicer.
	The fair values of derivatives are based on valuation models using current market terms (including interest rates and fees), the remaining terms of the agreements and the credit worthiness of the counter party as of the measurement date (Level 2).
	The following table sets forth the Company’s financial assets that were accounted for at fair value on a recurring basis as of the periods presented by level within the fair value hierarchy. During the nine months ended September 30, 2013, the Company did not make any transfers between recurring Level 1 fair value measurements and recurring Level 2 fair value measurements. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
		Quoted Prices in		Significant		Significant		Total
		Active  Markets		Other		Unobservable		Fair Value
		for Identical		Observable		Inputs
		Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
		(in thousands)
	September 30, 2013
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	4,366	$	55,798	$	—	$	60,164
	Mortgage backed securities		—		290,998		—		290,998
	Obligations of states and political subdivisions		—		37,691		—		37,691
	Corporate debt securities		—		13,404		—		13,404
	Equity securities		2,741		13,564		—		16,305
	Total securities available for sale		7,107		411,455		—		418,562
	Non-hedging interest rate derivatives		—		361		—		361
	Total Assets	$	7,107	$	411,816		—	$	418,923
	Non-hedging interest rate derivatives	$	—	$	361	$	—	$	361
	Total Liabilities	$	—	$	361	$	—	$	361
	December 31, 2012
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	3,493	$	83,078	$	—	$	86,571
	Mortgage backed securities		—		239,559		—		239,559
	Obligations of states and political subdivisions		—		38,620		—		38,620
	Corporate debt securities		—		13,444		—		13,444
	Equity securities		2,010		13,506		—		15,516
	Total securities available for sale		5,503		388,207		—		393,710
	Non-hedging interest rate derivatives		—		195		—		195
	Total Assets	$	5,503	$	388,402	$	—	$	393,905
	Non-hedging interest rate derivatives	$	—	$	195	$	—	$	195
	Total Liabilities	$	—	$	195	$	—	$	195
	The following table sets forth the Company’s assets subject to fair value adjustments (impairment) on a nonrecurring basis. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
		Quoted Prices in		Significant		Significant		Total
		Active Markets		Other		Unobservable		Fair Value
		for Identical		Observable		Inputs
		Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
		(in thousands)
	September 30, 2013
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	26,061	$	26,061
	Loans held for sale		—		901		—		901
	Other real estate owned and other repossessed assets		—		—		2,154		2,154
	December 31, 2012
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	31,531	$	31,531
	Other real estate owned and other repossessed assets		—		—		529		529
	Impaired loans are evaluated and valued at the time the loan is identified as impaired at the lower of cost or market value. Because most of Lakeland’s impaired loans are collateral dependent, fair value is generally measured based on the value of the collateral securing these loans and leases and is classified at a level 3 in the fair value hierarchy. Collateral may be real estate, accounts receivable, inventory, equipment and/or other business assets. The value of the real estate is assessed based on appraisals by qualified third party licensed appraisers. The appraisers may use the sales comparison approach, the cost approach or the income approach to value the collateral using discount rates (with ranges of 5-11%) or capitalization rates (with ranges of 5-9%) to evaluate the property. The value of the equipment may be determined by an appraiser, if significant, inquiry through a recognized valuation resource, or by the value on the borrower’s financial statements. Field examiner reviews on business assets may be conducted based on the loan exposure and reliance on this type of collateral. Appraised and reported values may be adjusted based on management’s historical knowledge, changes in market conditions from the time of valuation, and/or management’s expertise and knowledge of the client and client’s business. Loans that are not collateral dependent are evaluated based on a discounted cash flow method. Impaired loans are reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly, based on the same factors identified above.
	The Company has a held for sale loan portfolio that consists of residential mortgages that are being sold in the secondary market. The Company records these mortgages at the lower of cost or market value. Fair value is generally determined by the value of purchase commitments.
	Other real estate owned (OREO) and other repossessed assets, representing property acquired through foreclosure, are recorded at fair value less estimated disposal costs of the acquired property on the date of acquisition and thereafter remeasured and carried at lower of cost or fair market value. Fair value on other real estate owned is based on the appraised value of the collateral using the sales comparison approach or the income approach with discount rates or capitalization rates similar to those used in impaired loan valuation. The fair value of other repossessed assets is estimated by inquiry through recognized valuation resources.
	Changes in the assumptions or methodologies used to estimate fair values may materially affect the estimated amounts. Changes in economic conditions, locally or nationally, could impact the value of the estimated amounts of impaired loans, OREO and other repossessed assets.
	Fair Value of Certain Financial Instruments
	Estimated fair values have been determined by the Company using the best available data and an estimation methodology suitable for each category of financial instruments. Management is concerned that there may not be reasonable comparability between institutions due to the wide range of permitted assumptions and methodologies in the absence of active markets. This lack of uniformity gives rise to a high degree of subjectivity in estimating financial instrument fair values.
The estimation methodologies used, the estimated fair values, and recorded book balances at September 30, 2013 and December 31, 2012 are outlined below.
This summary, as well as the table below, excludes financial assets and liabilities for which carrying value approximates fair value. For financial assets, these include cash and cash equivalents. For financial liabilities, these include noninterest bearing demand deposits, savings and interest-bearing transaction accounts and federal funds sold and securities sold under agreements to repurchase. The estimated fair value of demand, savings and interest-bearing transaction accounts is the amount payable on demand at the reporting date. Carrying value is used because there is no stated maturity on these accounts, and the customer has the ability to withdraw the funds immediately. Also excluded from this summary and the following table are those financial instruments recorded at fair value on a recurring basis, as previously described.
The fair value of Investment Securities Held to Maturity was measured using information from the same third-party servicer used for Investment Securities Available for Sale using the same methodologies discussed above. Investment Securities Held to Maturity includes $4.5 million in short-term municipal bond anticipation notes that are non-rated and do not have an active secondary market or information readily available on standard financial systems. As a result, the securities are classified as Level 3 securities. These are investments in municipalities in the Company’s market area, and management performs a credit analysis on the municipality before investing in these securities.
Federal Home Loan Bank of New York (FHLB) stock is an equity interest that can be sold to the issuing FHLB, to other FHLBs, or to other member banks at its par value. Because ownership of these securities is restricted, they do not have a readily determinable fair value. As such, the Company’s FHLB Stock is recorded at cost or par value and is evaluated for impairment each reporting period by considering the ultimate recoverability of the investment rather than temporary declines in value. The Company’s evaluation primarily includes an evaluation of liquidity, capitalization, operating performance, commitments, and regulatory or legislative events.
The net loan portfolio at September 30, 2013 and December 31, 2012 has been valued using a present value discounted cash flow where market prices were not available. The discount rate used in these calculations is the estimated current market rate adjusted for credit risk. The carrying value of accrued interest approximates fair value.
For fixed maturity certificates of deposit, fair value was estimated based on the present value of discounted cash flows using the rates currently offered for deposits of similar remaining maturities. The carrying amount of accrued interest payable approximates its fair value.
The fair value of long-term debt is based upon the discounted value of contractual cash flows. The Company estimates the discount rate using the rates currently offered for similar borrowing arrangements. The fair value of subordinated debentures is based on bid/ask prices from brokers for similar types of instruments.
The fair values of commitments to extend credit and standby letters of credit are 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 guarantees and 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.
The following table presents the carrying values, fair values and placement in the fair value hierarchy of the Company’s financial instruments as of September 30, 2013 and December 31, 2012:
	Carrying		Fair		Quoted Prices in		Significant		Significant
	Value		Value		Active  Markets		Other		Unobservable
					for Identical		Observable		Inputs
					Assets		Inputs		(Level 3)
					(Level 1)		(Level 2)
	(in thousands)
September 30, 2013
Financial Instruments—Assets
Investment securities held to maturity	$	96,702	$	96,196	$	—	$	91,651	$	4,545
Federal Home Loan Bank Stock		5,965		5,965		—		5,965		—
Loans and leases		2,427,684		2,421,527		—		—		2,421,527
Financial Instruments—Liabilities
Certificates of Deposit		314,593		315,213		—		315,213		—
Other borrowings		75,000		78,905		—		78,905		—
Subordinated debentures		42,548		28,753		—		—		28,753
Commitments:
Standby letters of credit		—		7		—		—		7
31-Dec-12
Financial Instruments—Assets
Investment securities held to maturity	$	96,925	$	99,784	$	—	$	87,336	$	12,448
Federal Home Loan Bank Stock		5,382		5,382		—		5,382		—
Loans and leases		2,146,843		2,154,507		—		—		2,154,507
Financial Instruments—Liabilities
Certificates of Deposit		303,792		305,398		—		305,398		—
Other borrowings		85,000		91,325		—		91,325		—
Subordinated debentures		51,548		33,403		—		—		33,403
Commitments:
Standby letters of credit		—		4		—		—		4

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivatives	'
	Note 11. Derivatives
	Lakeland is a party to interest rate derivatives that are not designated as hedging instruments. These derivatives relate to interest rate swaps that the Company enters into with customers to allow customers to convert variable rate loans to a fixed rate. Lakeland pays interest to the customer at a floating rate on the notional amount and receives interest from the customer at a fixed rate for the same notional amount. At the same time the interest rate swap is entered into with the customer, an offsetting interest rate swap is entered into with another financial institution. Lakeland pays the other financial institution interest at the same fixed rate on the same notional amount as the swap entered into with the customer, and receives interest from the financial institution for the same floating rate on the same notional amount. The changes in the fair value of the swaps offset each other, except for the credit risk of the counterparties, which is determined by taking into consideration the risk rating, probability of default and loss of given default for all counterparties. As of September 30, 2013 and December 31, 2012, Lakeland had $1.5 million and $497,000, respectively, in securities pledged for collateral on its interest rate swaps with the financial institution.
	The following table presents summary information regarding these derivatives for the periods presented (dollars in thousands):
	September 30, 2013
		Notional Amount			Average Maturity			Weighted Average			Weighted Average		Fair Value
								Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	17,802			7			3.83	%		1 Mo Libor + 2.21	($	361	)
	Customer interest rate swaps		(17,802	)		7			3.83	%		1 Mo Libor + 2.21		361
	December 31, 2012
		Notional Amount			Average Maturity			Weighted Average			Weighted Average		Fair Value
								Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	6,400			10.1			4.625	%		1 Mo Libor + 2.61	$	195
	Customer interest rate swaps		(6,400	)		10.1			4.625	%		1 Mo Libor + 2.61	($	195	)
	The following shows the Company’s transactions that are subject to an enforceable master netting arrangement or other such similar agreements for the periods presented:
	September 30, 2013
	Offsetting of Financial Assets and Derivative Assets										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Assets			Instruments		Received
		Assets			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Customer interest rate swaps	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	Total	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	Offsetting of Financial Liabilities and Derivative Liabilities										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Liabilities			Instruments		Received
		Liabilities			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Third party interest rate swaps	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	Total	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	December 31, 2012
	Offsetting of Financial Assets and Derivative Assets										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Assets			Instruments		Received
		Assets			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Third party interest rate swaps	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195
	Total	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195
	Offsetting of Financial Liabilities and Derivative Liabilities										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Liabilities			Instruments		Received
		Liabilities			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Customer interest rate swaps	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195
	Total	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195

Preferred_Stock

Preferred Stock	9 Months Ended
	Sep. 30, 2013
Temporary Equity Disclosure [Abstract]	'
Preferred Stock	'
	Note 12. Preferred Stock
	On February 8, 2012, the Company redeemed its remaining 19,000 shares of its Fixed Rate Cumulative Preferred Stock, Series A originally issued to the U.S. Department of the Treasury under the Troubled Asset Relief Program Capital Purchase Program (“CPP”). The Company paid to the Treasury $19.2 million, which included $19.0 million of principal and $219,000 in accrued and unpaid dividends, on February 8, 2012. As a result of the early payment, the Company also accelerated the accretion of $501,000 of the preferred stock discount.
	On February 29, 2012, the Company repurchased the outstanding common stock warrant previously issued to the Treasury for the purchase of 1,046,901 shares of its common stock at an exercise price of $8.45 per share, for $2.8 million, completing the Company’s participation in the Treasury’s CPP. Upon repurchase, the common stock warrant had a carrying value of $3.3 million. The repurchase price of $2.8 million was recorded as a reduction to common stock on the statement of changes in stockholders’ equity.

Common_Stock

Common Stock	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Common Stock	'
	Note 13. Common Stock
	On September 4, 2012, the Company issued and sold an aggregate of 2,667,253 shares of common stock at a price of $9.65 per share pursuant to a takedown off of the Company’s shelf registration statement. The Company received net proceeds of $25.0 million which it used to repay $25.8 million in junior subordinated debentures on October 7, 2012. The junior subordinated debentures had been issued by the Company to Lakeland Capital Trust III in December 2003, had a coupon rate of 7.535% at the time of redemption and were due on January 7, 2034. The capital and common securities issued by the Trust in December 2003 were also redeemed.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	Note 14. Acquisitions
	On May 31, 2013, the Company completed its acquisition of Somerset Hills Bancorp, a bank holding company headquartered in Bernardsville, New Jersey. This acquisition enables the Company to expand into Somerset and Union counties, and broaden its presence in Morris county. Effective at the close of business on May 31, 2013, Somerset Hills Bancorp merged into the Company, and Somerset Hills Bank merged into Lakeland Bank. The Merger Agreement provided that the shareholders of Somerset Hills Bancorp would receive, at their election, for each outstanding share of Somerset Hills Bancorp common stock that they own at the effective time of the merger, either 1.1962 shares of Lakeland Bancorp common stock or $12.00 in cash, subject to proration as described in the Merger Agreement, so that 90% of the aggregate merger consideration was shares of Lakeland Bancorp common stock and 10% was cash. Lakeland Bancorp issued an aggregate of 5,794,079 shares of its common stock in the merger, and also assumed outstanding Somerset Hills Bancorp stock options (which were converted into options to purchase Lakeland Bancorp common stock). Lakeland Bancorp paid $6.5 million in cash in the transaction.
	The acquisition was accounted for under the acquisition method of accounting and accordingly, assets acquired, liabilities assumed and consideration exchanged were recorded at their estimated fair values as of the acquisition date. Somerset Hills’ assets were recorded at their preliminary estimated fair values as of May 31, 2013 and Somerset Hills’ results of operations have been included in the Company’s Consolidated Statements of Income since that date.
	The assets acquired and liabilities assumed in the acquisition were recorded at their estimated fair values based on management’s best estimates using information available at the date of the acquisition, including the use of a third party valuation specialist. The fair values are preliminary estimates and subject to adjustment for up to one year after the closing date of the acquisition. The following table summarizes the estimated fair value of the acquired assets and liabilities (in thousands).
	Consideration Paid
	Lakeland Bancorp stock issued	$	57,419
	Cash Payment		6,460
	Fair value of Somerset Hills stock options converted to Lakeland Bancorp stock options		1,603
	Total Consideration Paid	$	65,482
	Recognized amounts of identifiable assets and liabilities assumed at fair value
	Cash and cash equivalents	$	80,359
	Securities available for sale		1,737
	Securities held to maturity		8,686
	Federal Home Loan Bank stock		493
	Loans and leases		243,888
	Loans held for sale		2,532
	Premises and equipment		5,214
	Identifiable intangible assets		2,712
	Accrued interest receivable and other assets		10,270
	Deposits		(311,801	)
	Other liabilities		(1,877	)
	Total identifiable assets	$	42,213
	Goodwill	$	23,269
	Loans acquired in the Somerset Hills acquisition were recorded at fair value and subsequently accounted for in accordance with ASC Topic 310, and there was no carryover related allowance for loan and lease losses. The fair values of loans acquired from Somerset Hills were estimated using cash flow projections based on the remaining maturity and repricing terms. Cash flows were adjusted for estimated future credit losses and the rate of prepayments. Projected cash flows were then discounted to present value using a risk-adjusted market rate for similar loans.
	The following is a summary of the loans acquired in the Somerset Hills acquisition as of the closing date.
	(in thousands)	Acquired			Acquired		Total
		Credit			Non-Credit		Acquired
		Impaired			Impaired		Loans
		Loans			Loans
	Contractually required principal and interest at acquisition	$	4,507		$	352,148	$	356,655
	Contractual cash flows not expected to be collected (non-accretable difference)		2,541			—		2,541
	Expected cash flows at acquisition	$	1,966		$	352,148	$	354,114
	Interest component of expected cash flows (accretable difference)		361			107,333		107,694
	Fair value of acquired loans, including mortgages held for sale	$	1,605		$	244,815	$	246,420
	The core deposit intangible totaled $2.7 million and is being estimated over its estimated useful life of approximately 10 years using an accelerated method. The goodwill will be evaluated annually for impairment. The goodwill is not deductible for tax purposes.
	The fair values of deposit liabilities with no stated maturities such as checking, money market and savings accounts, were assumed to equal the carrying amounts since these deposits are payable on demand. The fair values of certificates of deposits and IRAs represent the present value of contractual cash flows discounted at market rates for similar certificates of deposit.
	Direct costs related to the acquisition were expensed as incurred. During the three and nine months ended September 30, 2013, the Company incurred $744,000 and $2.8 million, respectively, of merger and acquisition integration-related expenses, which have been separately stated in the Company’s Consolidated Statements of Income.
	Supplemental Pro Forma Financial Information
	The following table presents financial information regarding the former Somerset Hills operations included in our Consolidated Statements of Income from the date of the acquisition (May 31, 2013) through September 30, 2013 under the column “Actual from acquisition date through September 30, 2013.” In addition, the table provides unaudited condensed pro forma financial information assuming that the Somerset Hills acquisition had been completed as of January 1, 2013, for the nine months ended September 30, 2013 and as of January 1, 2012 for the nine months ended September 30, 2012. The table below has been prepared for comparative purposes only and is not necessarily indicative of the actual results that would have been attained had the acquisition occurred as of the beginning of the periods presented, nor is it indicative of future results. Furthermore, the unaudited proforma information does not reflect management’s estimate of any revenue-enhancing opportunities nor anticipated cost savings or the impact of conforming certain accounting policies of the acquired company to the Company’s policies that may have occurred as a result of the integration and consolidation of Somerset Hills’ operations. The pro forma information shown reflects adjustments related to certain purchase accounting fair value adjustments; amortization of core deposit and other intangibles; and related income tax effects.
	(in thousands)	Actual from			Pro-forma		Pro-forma
		acquisition to			September 30, 2013		September 30, 2012
		September 30, 2013
	Net interest income	$	3,534		$	81,331	$	80,352
	Noninterest income		513			16,624		15,312
	Noninterest expense		2,047			60,024		56,835
	Net income		1,300			20,477		17,573
	Earnings per share:
	Fully diluted				$	0.57	$	0.54

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Note 15. Goodwill and Intangible Assets
	The Company has goodwill of $110.4 million which includes $23.3 million from the Somerset Hills acquisition and $87.1 million from prior acquisitions. The Company reviews its goodwill and intangible assets annually, on November 30, or more frequently if conditions warrant, for impairment. In testing goodwill for impairment, the Company compares the estimated fair value of each reporting unit to their respective carrying amounts, including goodwill. The Company has determined that it has one reporting unit, Community Banking.
	As stated above, the Company recorded $2.7 million in core deposit intangible for the Somerset Hills acquisition. Year-to-date, it has amortized $164,000 in core deposit intangible. The estimated future amortization expense for each of the succeeding five years ended December 31 is as follows (dollars in thousands):
	For the year ended:
	2013	$	123
	2014		464
	2015		415
	2016		366
	2017		316

Early_Extinguishment_of_Debt

Early Extinguishment of Debt	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Early Extinguishment of Debt	'
	Note 16. Early Extinguishment of Debt
	On June 18, 2013, the Company acquired and extinguished $9.0 million of Lakeland Bancorp Capital Trust I debentures and recorded a $1.2 million gain on extinguishment of debt. The interest rate on this debenture floated at LIBOR plus 310 basis points and had a rate of 3.38% at the time of extinguishment. The Company redeemed the remaining $1.0 million in the fourth quarter of 2013 at par value.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2013
Accounting Changes And Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	Note 17. Recent Accounting Pronouncements
	In July 2013, the Financial Accounting Standards Board (the “FASB”) issued an accounting pronouncement to improve the reporting for unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The pronouncement is expected to reduce diversity in practice by providing guidance on the presentation of unrecognized tax benefits and will better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. The pronouncement is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this pronouncement is not expected to have a material impact on the Company’s financial statements.
	In July 2013, the FASB issued guidance permitting the Fed Funds Effective Swap Rate to be used as a U.S. benchmark interest rate for hedge accounting purposes, in addition to interest rates on direct Treasury obligations of the U.S. government and the London Interbank Offered Rate (“LIBOR”). This guidance is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013 and is not expected to have a significant impact on the Company’s financial statements.
	In February 2013, the FASB issued guidance relating to the reporting of amounts reclassified out of accumulated other comprehensive income. This guidance further updates guidance issued in 2011 increasing the prominence of items reported in other comprehensive income and facilitating the convergence of U.S. GAAP and International Financial Reporting Standards (“IFRS”). The guidance issued in 2013 requires an entity to provide information about the items reclassified out of other comprehensive income by component. This guidance is effective during interim and annual periods beginning after December 15, 2012, and is to be applied retrospectively. The Company adopted this guidance in the first quarter of 2013. Adoption of this guidance did not have a significant impact on the Company’s consolidated financial statements.
	In December 2011, the FASB issued accounting guidance regarding disclosures about offsetting assets and liabilities. The scope of this accounting guidance was further clarified by the FASB on January 1, 2013. This guidance affects all entities that have financial instruments and derivative instruments that are either (1) offset in accordance with U.S. GAAP or (2) subject to an enforceable master netting arrangement or similar agreement. This information will enable users of an entity’s financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position, including the effect or potential effect of rights of setoff associated with certain financial instruments and derivative instruments in the scope of this guidance. The Company adopted this guidance in the first quarter of 2013 and provided the disclosures required by those amendments retrospectively for all comparative periods presented. Adoption of this guidance did not have a significant impact on the Company’s consolidated financial statements.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation.
	This quarterly report presents the consolidated financial statements of Lakeland Bancorp, Inc. (the Company) and its subsidiary, Lakeland Bank (Lakeland). The accounting and reporting policies of the Company conform with accounting principles generally accepted in the United States of America (U.S. GAAP) and predominant practices within the banking industry.
	The Company’s unaudited interim financial statements reflect all adjustments, such as normal recurring accruals that are, in the opinion of management, necessary for the fair presentation of the results of the interim periods. The results of operations for the quarter presented do not necessarily indicate the results that the Company will achieve for all of 2013. You should read these interim financial statements in conjunction with the audited consolidated financial statements and accompanying notes that are presented in the Lakeland Bancorp, Inc. Annual Report on Form 10-K for the year ended December 31, 2012.
	On May 31, 2013, the Company completed its acquisition of Somerset Hills Bancorp (“Somerset Hills”). For more information, see Note 14 below.
	The financial information in this quarterly report has been prepared in accordance with the Company’s customary accounting practices. Certain information and footnote disclosures required under U.S. GAAP have been condensed or omitted, as permitted by rules and regulations of the Securities and Exchange Commission.
	All weighted average, actual share and per share information set forth in this Quarterly Report on Form 10-Q have been adjusted retroactively for the effects of stock dividends.
	Certain reclassifications have been made to prior period financial statements to conform to the 2013 presentation.
Loans and Debt Securities Acquired with Deteriorated Credit Quality	'
	The carrying value of loans acquired and accounted for in accordance with ASC Subtopic 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality,” was $1.6 million at September 30, 2013, which was substantially the same as the balance at the acquisition date of May 31, 2013. Under ASC Subtopic 310-30, loans may be aggregated and accounted for as pools of loans if the loans being aggregated have common risk characteristics. The Company elected to account for the loans with evidence of credit deterioration individually rather than aggregate them into pools. The difference between the undiscounted cash flows expected at acquisition and the investment in the acquired loans, or the “accretable yield,” is recognized as interest income utilizing the level-yield method over the life of each loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “non-accretable difference,” are not recognized as a yield adjustment, as a loss accrual or as a valuation allowance.
	Increases in expected cash flows subsequent to the acquisition are recognized prospectively through an adjustment of the yield on the loans over the remaining life, while decreases in expected cash flows are recognized as impairment through a loss provision and an increase in the allowance for loan losses. Valuation allowances (recognized in the allowance for loan losses) on these impaired loans reflect only losses incurred after the acquisition (representing all cash flows that were expected at acquisition but currently are not expected to be received).

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Weighted Average Assumptions Used to Estimate Options Using Black-Scholes Option Pricing Model	'
	The fair value of these options were estimated using the Black-Scholes option pricing model with the following weighted average assumptions:
	Risk-free interest rates		1.55	%
	Expected dividend yield		2.82	%
	Expected volatility		45.45	%
	Expected lives (years)		7
	Weighted average fair value of options granted	$	3.48
Option Activity under Stock Option Plans	'
	Option activity under the Company’s stock option plans is as follows:
							Weighted
							average
					Weighted		remaining
					average		contractual
		Number of			exercise		term		Aggregate
		shares			price		( in years)		intrinsic value
	Outstanding, January 1, 2013		475,697		$	12.31			$	53,853
	Issued		426,372			7.03
	Exercised		(98,895	)		7.18
	Forfeited		(7,826	)		12.93
	Outstanding, September 30, 2013		795,348		$	10.11		2.88	$	1,504,444
	Options exercisable at
	September 30, 2013		749,835		$	10.14		2.49	$	1,434,088
Summary of Company's Restricted Stock	'
	Information regarding the Company’s restricted stock (all unvested) and changes during the nine months ended September 30, 2013 is as follows:
					Weighted
		Number of			average
		shares			price
	Outstanding, January 1, 2013		222,556		$	9.15
	Granted		104,182			9.88
	Vested		(65,782	)		8.6
	Forfeited		(2,711	)		9.26
	Outstanding, September 30, 2013		258,245		$	9.58

Comprehensive_Income_Tables

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Components of Other Comprehensive Income	'
	The components of other comprehensive income are as follows:
			September 30, 2013									September 30, 2012
	For the quarter ended:		Before tax			Tax Benefit			Net of			Before tax			Tax Benefit			Net of tax
			amount			(Expense)			tax amount			amount			(Expense)			amount
			(in thousands)									(in thousands)
	Net unrealized gains on available for sale securities
	Net unrealized holding gains arising during period		$	1,765		($	647	)	$	1,118		$	1,933		($	713	)	$	1,220
	Reclassification adjustment for net gains arising during the period			—			—			—			—			—			—
	Net unrealized gains		$	1,765		($	647	)	$	1,118		$	1,933		($	713	)	$	1,220
	Change in minimum pension liability			8			(3	)		5			8			(3	)		5
	Other comprehensive income, net		$	1,773		($	650	)	$	1,123		$	1,941		($	716	)	$	1,225
	For the nine months ended:		Before tax			Tax Benefit			Net of			Before tax			Tax Benefit			Net of tax
			amount			(Expense)			tax amount			amount			(Expense)			amount
			(in thousands)									(in thousands)
	Net unrealized gains (losses) on available for sale securities
	Net unrealized holding gains (losses) arising during period		($	8,635	)	$	3,181		($	5,454	)	$	3,441		($	1,267	)	$	2,174
	Reclassification adjustment for net gains arising during the period			(506	)		177			(329	)		(273	)		96			(177	)
	Net unrealized gains (losses)		($	9,141	)	$	3,358		($	5,783	)	$	3,168		($	1,171	)	$	1,997
	Change in minimum pension liability			23			(8	)		15			23			(8	)		15
	Other comprehensive income (loss), net		($	9,118	)	$	3,350		($	5,768	)	$	3,191		($	1,179	)	$	2,012
Summary of Changes in Accumulated Other Comprehensive Income by Component	'
	The following table shows the changes in the balances of each of the components of other comprehensive income for the periods presented:
	Changes in Accumulated Other Comprehensive Income by Component (a)
			For the Three Months Ended									For the Three Months Ended
			September 30, 2013									September 30, 2012
			Unrealized Gains			Pension Items			Total			Unrealized Gains			Pension Items			Total
			and Losses on									and Losses on
			Available-for-sale									Available-for-sale
			Securities									Securities
	Beginning Balance		($	2,348	)	($	607	)	($	2,955	)	$	4,283		($	625	)	$	3,658
			(in thousands)
	Other comprehensive income before classifications			1,118			5			1,123			1,220			5			1,225
	Amounts reclassified from accumulated other comprehensive income			—			—			—			—			—			—
	Net current period other comprehensive income			1,118			5			1,123			1,220			5			1,225
	Ending balance		($	1,230	)	($	602	)	($	1,832	)	$	5,503		($	620	)	$	4,883
	(a)	All amounts are net of tax.
	Changes in Accumulated Other Comprehensive Income by Component (a)
			For the Nine Months Ended									For the Nine Months Ended
			September 30, 2013									September 30, 2012
			Unrealized Gains			Pension Items			Total			Unrealized Gains			Pension Items			Total
			and Losses on									and Losses on
			Available-for-sale									Available-for-sale
			Securities									Securities
	Beginning Balance		$	4,553		($	617	)	$	3,936		$	3,506		($	635	)	$	2,871
			(in thousands)
	Other comprehensive income (loss) before classifications			(5,454	)		15			(5,439	)		2,174			15			2,189
	Amounts reclassified from accumulated other comprehensive income			(329	)		—			(329	)		(177	)		—			(177	)
	Net current period other comprehensive income (loss)			(5,783	)		15			(5,768	)		1,997			15			2,012
	Ending balance		($	1,230	)	($	602	)	($	1,832	)	$	5,503		($	620	)	$	4,883
	(a)	All amounts are net of tax.

Statement_of_Cash_Flow_Informa1

Statement of Cash Flow Information, Supplemental Information (Tables)	9 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Schedule of Noncash Investing and Financing Activities	'
		For the Nine Months Ended
		September 30,
		2013		2012
		(in thousands)
	Supplemental schedule of noncash investing and financing activities:
	Cash paid during the period for income taxes	$	8,497	$	6,467
	Cash paid during the period for interest		7,750		12,504
	Transfer of loans and leases into other repossessed assets and other real estate owned		3,098		651

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings Per Share	'
	The following schedule shows the Company’s earnings per share for the periods presented:
		For the Three Months Ended				For the Nine Months Ended
		September 30,				September 30,
	(In thousands, except per share data)	2013		2012		2013		2012
	Net income available to common shareholders	$	6,617	$	5,489	$	17,628	$	15,293
	Less: earnings allocated to participating securities		48		49		125		134
	Net income allocated to common shareholders	$	6,569	$	5,440	$	17,503	$	15,159
	Weighted average number of common shares outstanding—basic		35,512		27,550		32,223		26,998
	Share-based plans		224		92		131		67
	Weighted average number of common shares—diluted		35,736		27,642		32,354		27,065
	Basic earnings per share	$	0.18	$	0.2	$	0.54	$	0.56
	Diluted earnings per share	$	0.18	$	0.2	$	0.54	$	0.56

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]	'
Reconciliation of Available-for-Sale Securities	'
	AVAILABLE FOR SALE	September 30, 2013										December 31, 2012
		Amortized		Gross		Gross			Fair Value			Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized						Cost		Unrealized		Unrealized
				Gains		Losses								Gains		Losses
		(in thousands)										(in thousands)
	U.S. treasury and U.S. government agencies	$	62,117	$	—	$	(1,953	)	$	60,164		$	86,002	$	577	$	(8	)	$	86,571
	Mortgage-backed securities, residential		291,961		3,031		(3,994	)		290,998			235,052		5,086		(579	)		239,559
	Obligations of states and political subdivisions		37,210		922		(441	)		37,691			36,848		1,832		(60	)		38,620
	Other debt securities		13,560		59		(215	)		13,404			13,576		189		(321	)		13,444
	Equity securities		15,607		991		(293	)		16,305			14,984		608		(76	)		15,516
		$	420,455	$	5,003	$	(6,896	)	$	418,562		$	386,462	$	8,292	$	(1,044	)	$	393,710
Reconciliation of Held-to-Maturity Securities	'
	HELD TO MATURITY	September 30, 2013										December 31, 2012
		Amortized		Gross		Gross			Fair Value			Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized						Cost		Unrealized		Unrealized
				Gains		Losses								Gains		Losses
		(in thousands)										(in thousands)
	U.S. government agencies	$	15,989	$	63	$	(326	)	$	15,726		$	16,089	$	385	$	—		$	16,474
	Mortgage-backed securities, residential		36,081		569		(753	)		35,897			39,065		1,313		(27	)		40,351
	Mortgage-backed securities, multifamily		2,380		—		(159	)		2,221			1,421		—		(13	)		1,408
	Obligations of states and political subdivisions		40,710		594		(658	)		40,646			38,801		1,068		(68	)		39,801
	Other debt securities		1,542		164		—			1,706			1,549		201		—			1,750
		$	96,702	$	1,390	$	(1,896	)	$	96,196		$	96,925	$	2,967	$	(108	)	$	99,784
Summary of Contractual Maturities of Investment Securities Classified as Available for Sale and Held to Maturity	'
	The following table shows investment securities by stated maturity. Securities backed by mortgages have expected maturities that differ from contractual maturities because borrowers have the right to call or prepay, and are, therefore, classified separately with no specific maturity date (in thousands):
		September 30, 2013
		Available for Sale				Held to Maturity
		Amortized		Fair Value		Amortized			Fair Value
		Cost				Cost
	Due in one year or less	$	5,848	$	5,896	$	6,065		$	6,096
	Due after one year through five years		36,066		36,365		14,046			14,619
	Due after five years through ten years		68,169		66,502		30,659			30,206
	Due after ten years		2,804		2,496		7,471			7,157
			112,887		111,259		58,241			58,078
	Mortgage-backed securities		291,961		290,998		38,461			38,118
	Equity securities		15,607		16,305		—			—
	Total securities	$	420,455	$	418,562	$	96,702		$	96,196
Sales of Securities, Gross Gains and Gross Losses on Sales of Securities	'
	The following table shows proceeds from sales of securities, gross gains and gross losses on sales or calls of securities and other than temporary impairments for the periods indicated (in thousands):
		For the Three Months Ended				For the Nine Months Ended
		September 30,				September 30,
		2013		2012		2013			2012
	Sale proceeds	$	—	$	—	$	53,670		$	53,718
	Gross gains		—		—		509			584
	Gross losses		—		—		(3	)		(311	)
Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position	'
	The following table indicates the length of time individual securities have been in a continuous unrealized loss position at September 30, 2013 and December 31, 2012:
	September 30, 2013	Less than 12 months				12 months or longer						Total
	AVAILABLE FOR SALE	Fair value		Unrealized		Fair value			Unrealized			Number of		Fair value		Unrealized
				Losses					Losses			securities				Losses
						(dollars in thousands)
	U.S. treasury and U.S. government agencies	$	60,164	$	1,953	$	—		$	—			13	$	60,164	$	1,953
	Mortgage-backed securities, residential		129,802		3,734		6,251			260			35		136,053		3,994
	Obligations of states and political subdivisions		6,122		298		1,585			143			15		7,707		441
	Other debt securities		—		—		5,764			215			2		5,764		215
	Equity securities		9,996		272		225			21			3		10,221		293
		$	206,084	$	6,257	$	13,825		$	639			68	$	219,909	$	6,896
	HELD TO MATURITY
	U.S. government agencies	$	10,658	$	326	$	—		$	—			2	$	10,658	$	326
	Mortgage-backed securities, residential		22,325		753		—			—			9		22,325		753
	Mortgage-backed securities, multifamily		2,221		159		—			—			2		2,221		159
	Obligations of states and political subdivisions		14,453		654		351			4			44		14,804		658
		$	49,657	$	1,892	$	351		$	4			57	$	50,008	$	1,896
	December 31, 2012	Less than 12 months				12 months or longer						Total
	AVAILABLE FOR SALE	Fair value		Unrealized		Fair value			Unrealized			Number of		Fair value		Unrealized
				Losses					Losses			securities				Losses
		(dollars in thousands)
	U.S. government agencies	$	3,992	$	8	$	—		$	—			1	$	3,992	$	8
	Mortgage-backed securities, residential		30,359		572		3,239			7			10		33,598		579
	Obligations of states and political subdivisions		2,825		60		—			—			7		2,825		60
	Other debt securities		—		—		5,661			321			2		5,661		321
	Equity securities		4,621		76		—			—			2		4,621		76
		$	41,797	$	716	$	8,900		$	328			22	$	50,697	$	1,044
	HELD TO MATURITY
	Mortgage-backed securities, residential	$	1,239	$	27	$	—		$	—			1	$	1,239	$	27
	Mortgage-backed securities, multifamily		1,408		13		—			—			1		1,408		13
	Obligations of states and political subdivisions		3,705		63		371			5			10		4,076		68
		$	6,352	$	103	$	371		$	5			12	$	6,723	$	108

Loans_and_Leases_Tables

Loans and Leases (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Composition of Lakeland`s Loan and Lease Portfolio	'
	The following sets forth the composition of Lakeland’s loan and lease portfolio as of September 30, 2013 and December 31, 2012:
			September 30,			December 31,
			2013			2012
			(in thousands)
	Commercial, secured by real estate		$	1,348,314		$	1,125,137
	Commercial, industrial and other			214,877			216,129
	Leases			37,845			26,781
	Real estate-residential mortgage			437,788			423,262
	Real estate-construction			50,121			46,272
	Home equity and consumer			339,805			309,626
	Total loans			2,428,750			2,147,207
	Plus: deferred fees			(1,066	)		(364	)
	Loans, net of deferred fees		$	2,427,684		$	2,146,843
Company's Non-Performing Assets and its Accruing Troubled Debt Restructurings	'
	The following schedule sets forth certain information regarding the Company’s non-performing assets and its accruing troubled debt restructurings:
			September 30,			December 31,
	(in thousands)		2013			2012
	Commercial, secured by real estate		$	6,585		$	10,511
	Commercial, industrial and other			184			1,476
	Leases			—			32
	Real estate—residential mortgage			5,996			8,733
	Real estate—construction			921			4,031
	Home equity and consumer			2,819			3,197
	Total non-accrual loans and leases		$	16,505		$	27,980
	Other real estate and other repossessed assets			2,154			529
	TOTAL NON-PERFORMING ASSETS		$	18,659		$	28,509
	Troubled debt restructurings, still accruing		$	11,006		$	7,336
Age Analysis of Past Due Loans, Segregated by Class of Loans	'
	An age analysis of past due loans, segregated by class of loans as of September 30, 2013 and December 31, 2012, is as follows:
			30-59 Days			60-89 Days			Greater			Total Past			Current			Total			Recorded
			Past Due			Past Due			Than			Due						Loans			Investment greater
									89 Days									and Leases			than 89 Days and
																					still accruing
			(in thousands)
	September 30, 2013
	Commercial, secured by real estate		$	9,075		$	3,783		$	7,222		$	20,080		$	1,328,234		$	1,348,314		$	637
	Commercial, industrial and other			191			571			192			954			213,923			214,877			8
	Leases			12			—			—			12			37,833			37,845			—
	Real estate—residential mortgage			3,261			1,085			6,942			11,288			426,500			437,788			946
	Real estate—construction			—			—			921			921			49,200			50,121			—
	Home equity and consumer			2,521			694			3,711			6,926			332,879			339,805			892
			$	15,060		$	6,133		$	18,988		$	40,181		$	2,388,569		$	2,428,750		$	2,483
	December 31, 2012
	Commercial, secured by real estate		$	3,831		$	2,308		$	10,511		$	16,650		$	1,108,487		$	1,125,137		$	—
	Commercial, industrial and other			400			171			1,476			2,047			214,082			216,129			—
	Leases			367			36			32			435			26,346			26,781			—
	Real estate—residential mortgage			2,370			821			10,012			13,203			410,059			423,262			1,279
	Real estate—construction			1,100			—			4,031			5,131			41,141			46,272			—
	Home equity and consumer			2,479			363			3,355			6,197			303,429			309,626			158
			$	10,547		$	3,699		$	29,417		$	43,663		$	2,103,544		$	2,147,207		$	1,437
Impaired Loans With and Without Specific Allowances	'
	Impaired Loans
	Impaired loans as of September 30, 2013, September 30, 2012 and December 31, 2012 are as follows:
			Recorded			Contractual			Specific			Interest			Average
			Investment in			Unpaid			Allowance			Income			Investment in
			Impaired loans			Principal						Recognized			Impaired loans
						Balance
			(in thousands)
	September 30, 2013
	Loans without specific allowance:
	Commercial, secured by real estate		$	7,098		$	7,352		$	—		$	137		$	7,663
	Commercial, industrial and other			4,037			4,002			—			142			4,428
	Real estate-residential mortgage			—			—			—			—			—
	Real estate-construction			—			—			—			—			1,328
	Home equity and consumer			18			18			—			1			18
	Loans with specific allowance:
	Commercial, secured by real estate			11,769			12,890			1,044			298			11,024
	Commercial, industrial and other			388			498			78			6			659
	Real estate-residential mortgage			479			479			72			—			497
	Real estate-construction			921			3,015			41			—			1,307
	Home equity and consumer			1,351			1,351			203			33			1,292
	Total:
	Commercial, secured by real estate		$	18,867		$	20,242		$	1,044		$	435		$	18,687
	Commercial, industrial and other			4,425			4,500			78			148			5,087
	Real estate—residential mortgage			479			479			72			—			497
	Real estate-construction			921			3,015			41			—			2,635
	Home equity and consumer			1,369			1,369			203			34			1,310
			$	26,061		$	29,605		$	1,438		$	617		$	28,216
			Recorded			Contractual			Specific			Interest			Average
			Investment in			Unpaid			Allowance			Income			Investment in
			Impaired loans			Principal						Recognized			Impaired loans
						Balance
			(in thousands)
	September 30, 2012
	Loans without specific allowance:
	Commercial, secured by real estate		$	14,263		$	18,253		$	—		$	260		$	15,605
	Commercial, industrial and other			4,927			4,938			—			67			3,555
	Real estate-residential mortgage			366			366			—			6			386
	Real estate-construction			3,977			4,606			—			—			7,611
	Home equity and consumer			350			350			—			—			337
	Loans with specific allowance:
	Commercial, secured by real estate			3,127			3,895			313			45			4,389
	Commercial, industrial and other			787			902			216			—			641
	Real estate-residential mortgage			288			288			43			4			384
	Real estate-construction			120			997			12			—			331
	Home equity and consumer			946			946			142			36			946
	Total:
	Commercial, secured by real estate		$	17,390		$	22,148		$	313		$	305		$	19,994
	Commercial, industrial and other			5,714			5,840			216			67			4,196
	Real estate—residential mortgage			654			654			43			10			770
	Real estate-construction			4,097			5,603			12			—			7,942
	Home equity and consumer			1,296			1,296			142			36			1,283
			$	29,151		$	35,541		$	726		$	418		$	34,185
			Recorded			Contractual			Specific			Interest			Average
			Investment in			Unpaid			Allowance			Income			Investment in
			Impaired loans			Principal						Recognized			Impaired loans
						Balance
			(in thousands)
	December 31, 2012
	Loans without specific allowance:
	Commercial, secured by real estate		$	16,458		$	21,665		$	—		$	495		$	18,301
	Commercial, industrial and other			4,896			4,932			—			116			3,838
	Real estate-residential mortgage			360			360			—			6			385
	Real estate-construction			3,332			4,433			—			—			5,533
Home equity and consumer			369			369			—			1			360
Loans with specific allowance:
Commercial, secured by real estate			3,346			4,088			368			46			3,825
Commercial, industrial and other			808			871			219			1			769
Real estate-residential mortgage			288			288			43			4			374
Real estate-construction			698			1,085			97			—			1,445
Home equity and consumer			976			976			146			55			934
Total:
Commercial, secured by real estate		$	19,804		$	25,753		$	368		$	541		$	22,126
Commercial, industrial and other			5,704			5,803			219			117			4,607
Real estate—residential mortgage			648			648			43			10			759
Real estate-construction			4,030			5,518			97			—			6,978
Home equity and consumer			1,345			1,345			146			56			1,294
		$	31,531		$	39,067		$	873		$	724		$	35,764
Company's Commercial Loan Portfolio	'
	September 30, 2013
	Risk Rating		Commercial,			Commercial,			Real estate-
			secured by			industrial			construction
			real estate			and other
	1		$	—		$	774		$	—
	2			—			16,089			—
	3			71,453			9,822			—
	4			420,190			57,793			—
	5			733,677			87,859			46,515
	5W—Watch			38,488			11,150			—
	6—Other Assets Especially Mentioned			28,003			8,730			2,639
	7—Substandard			56,418			22,660			967
	8—Doubtful			85			—			—
	9—Loss			—			—			—
	Total		$	1,348,314		$	214,877		$	50,121
	December 31, 2012
	Risk Rating		Commercial,			Commercial,			Real estate-
			secured by			industrial			construction
			real estate			and other
	1		$	—		$	996		$	—
	2			—			12,899			—
	3			44,448			15,676			—
	4			350,145			62,676			795
	5			623,912			88,033			34,682
	5W—Watch			43,515			13,261			—
	6—Other Assets Especially Mentioned			21,132			2,845			6,535
	7—Substandard			41,817			19,743			4,260
	8—Doubtful			168			—			—
	9—Loss			—			—			—
	Total		$	1,125,137		$	216,129		$	46,272
Allowance for Loan and Lease Losses by Portfolio Segment and Related Recorded Investment in Loans and Leases	'
	The following table details activity in the allowance for loan and lease losses by portfolio segment and the related recorded investment in loans and leases for the nine months ended September 30, 2013 and the year ended December 31, 2012:
	Nine Months Ended September 30, 2013		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
	Allowance for Loan and Lease Losses:		secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Beginning Balance		$	16,258		$	5,103		$	578		$	3,568		$	587		$	2,837		$	28,931
	Charge-offs			(1,192	)		(1,103	)		(206	)		(903	)		(3,652	)		(1,252	)	($	8,308	)
	Recoveries			955			139			119			97			12			156		$	1,478
	Provision			1,684			971			17			423			3,431			1,130		$	7,656
	Ending Balance		$	17,705		$	5,110		$	508		$	3,185		$	378		$	2,871		$	29,757
	Ending Balance: Individually evaluated for impairment		$	1,044		$	78		$	—		$	72		$	41		$	203		$	1,438
	Ending Balance: Collectively evaluated for impairment			16,661			5,032			508			3,113			337			2,668		$	28,319
	Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—			—
	Ending Balance		$	17,705		$	5,110		$	508		$	3,185		$	378		$	2,871		$	29,757
	Loans and Leases:
	Ending Balance: Individually evaluated for impairment		$	18,867		$	4,425		$	—		$	479		$	921		$	1,369		$	26,061
	Ending Balance: Collectively evaluated for impairment			1,328,185			210,452			37,845			437,309			49,200			338,066		$	2,401,057
	Ending Balance: Loans acquired with deteriorated credit quality			1,262			—			—			—			—			370		$	1,632
	Ending Balance (1)		$	1,348,314		$	214,877		$	37,845		$	437,788		$	50,121		$	339,805		$	2,428,750
	-1	Excludes deferred fees
	Year Ended December 31, 2012		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
	Allowance for Loan and Lease Losses:		secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Beginning Balance		$	16,618		$	3,477		$	688		$	3,077		$	1,424		$	3,132		$	28,416
	Charge-offs			(7,287	)		(949	)		(999	)		(1,822	)		(2,888	)		(2,074	)	($	16,019	)
	Recoveries			280			428			504			66			43			306		$	1,627
	Provision			6,647			2,147			385			2,247			2,008			1,473		$	14,907
	Ending Balance		$	16,258		$	5,103		$	578		$	3,568		$	587		$	2,837		$	28,931
	Ending Balance: Individually evaluated for impairment		$	368		$	219		$	—		$	43		$	97		$	146		$	873
	Ending Balance: Collectively evaluated for impairment			15,890			4,884			578			3,525			490			2,691		$	28,058
	Ending Balance		$	16,258		$	5,103		$	578		$	3,568		$	587		$	2,837		$	28,931
	Loans and Leases:
	Ending Balance: Individually evaluated for impairment		$	19,804		$	5,704		$	—		$	648		$	4,030		$	1,345		$	31,531
	Ending Balance: Collectively evaluated for impairment			1,105,333			210,425			26,781			422,614			42,242			308,281		$	2,115,676
	Ending Balance(1)		$	1,125,137		$	216,129		$	26,781		$	423,262		$	46,272		$	309,626		$	2,147,207
	-1	Excludes deferred fees
Summary of Restructured Loans	'
	The following tables summarize loans that have been restructured during the three and nine months ended September 30, 2013 and 2012:
			For the Three Months Ended									For the Three Months Ended
			September 30, 2013									September 30, 2012
			Number of			Pre-			Post-			Number of			Pre-			Post-
			Contracts			Modification			Modification			Contracts			Modification			Modification
						Outstanding			Outstanding						Outstanding			Outstanding
						Recorded			Recorded						Recorded			Recorded
						Investment			Investment						Investment			Investment
			(Dollars in thousands)									(Dollars in thousands)
	Troubled Debt Restructurings:
	Commercial, secured by real estate			—		$	—		$	—			3		$	521		$	432
	Commercial, industrial and other			—			—			—			2			56			52
	Leases			—			—			—			—			—			—
	Real estate—residential mortgage			—			—			—			—			—			—
	Real estate—construction			—			—			—			—			—			—
	Home equity and consumer			—			—			—			—			—			—
				—		$	—		$	—			5		$	577		$	484
			For the Nine Months Ended									For the Nine Months Ended
			September 30, 2013									September 30, 2012
			Number of			Pre-			Post-			Number of			Pre-			Post-
			Contracts			Modification			Modification			Contracts			Modification			Modification
						Outstanding			Outstanding						Outstanding			Outstanding
						Recorded			Recorded						Recorded			Recorded
						Investment			Investment						Investment			Investment
			(Dollars in thousands)									(Dollars in thousands)
	Troubled Debt Restructurings:
	Commercial, secured by real estate			11		$	5,472		$	5,468			8		$	1,524		$	1,407
	Commercial, industrial and other			1			127			125			4			4,231			4,218
	Leases			—			—			—			—			—			—
	Real estate—residential mortgage			—			—			—			—			—			—
	Real estate—construction			—			—			—			—			—			—
	Home equity and consumer			1			11			11			—			—			—
				13		$	5,610		$	5,604			12		$	5,755		$	5,625
Summary of Restructured Debt Within Last 12 Months that have Subsequently Defaulted	'
	The following table summarizes as of September 30, 2013 and 2012, loans that were restructured within the last 12 months that have subsequently defaulted:
			For the Nine Months Ended
			September 30, 2013						September 30, 2012
			Number of			Recorded			Number of			Recorded
			Contracts			Investment			Contracts			Investment
			(Dollars in thousands)						(Dollars in thousands)
	Defaulted Troubled Debt Restructurings:
	Commercial, secured by real estate			5		$	3,084			2		$	267
	Commercial, industrial and other			—			—			1			62
	Leases			—			—			—			—
	Real estate—residential mortgage			—			—			—			—
	Real estate—construction			—			—			—			—
	Home equity and consumer			—			—			—			—
				5		$	3,084			3		$	329
Summary of Gains on Leasing Related Assets	'
	The following table shows the components of gains on leasing related assets for the periods presented:
			For the Three Months Ended						For the Nine Months Ended
			September 30,						September 30,
			2013			2012			2013			2012
			(in thousands)						(in thousands)
	Gains (losses) on sales of leases		$	—		$	—		$	—		$	—
	Realized gains on paid off leases			20			92			51			365
	Gains on other repossessed assets			—			8			12			38
	Total gains on leasing related assets		$	20		$	100		$	63		$	403

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2013
Components of Net Periodic Pension Cost for Defined Benefit Pension Plan	'
	The components of net periodic pension cost for the Newton Trust Company’s defined benefit pension plan are as follows:
		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
		(in thousands)						(in thousands)
	Interest cost	$	22		$	22		$	67		$	65
	Expected return on plan assets		(18	)		(19	)		(54	)		(57	)
	Amortization of unrecognized net actuarial loss		21			18			62			54
	Net periodic benefit expense	$	25		$	21		$	75		$	62
Director [Member]	'
Components of Net Periodic Pension Cost for Defined Benefit Pension Plan	'
	The components of net periodic plan costs for the directors’ retirement plan are as follows:
		For the Three Months Ended						For the Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
		(in thousands)						(in thousands)
	Service cost	$	8		$	8		$	22		$	23
	Interest cost		9			11			27			31
	Amortization of prior service cost		3			3			10			10
	Amortization of unrecognized net actuarial loss		2			3			6			9
	Net periodic benefit expense	$	22		$	25		$	65		$	73

Estimated_Fair_Value_of_Financ1

Estimated Fair Value of Financial Instruments and Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Financial Assets and Liabilities are Classified	'
	The following table sets forth the Company’s financial assets that were accounted for at fair value on a recurring basis as of the periods presented by level within the fair value hierarchy. During the nine months ended September 30, 2013, the Company did not make any transfers between recurring Level 1 fair value measurements and recurring Level 2 fair value measurements. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
		Quoted Prices in		Significant		Significant		Total
		Active  Markets		Other		Unobservable		Fair Value
		for Identical		Observable		Inputs
		Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
		(in thousands)
	September 30, 2013
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	4,366	$	55,798	$	—	$	60,164
	Mortgage backed securities		—		290,998		—		290,998
	Obligations of states and political subdivisions		—		37,691		—		37,691
	Corporate debt securities		—		13,404		—		13,404
	Equity securities		2,741		13,564		—		16,305
	Total securities available for sale		7,107		411,455		—		418,562
	Non-hedging interest rate derivatives		—		361		—		361
	Total Assets	$	7,107	$	411,816		—	$	418,923
	Non-hedging interest rate derivatives	$	—	$	361	$	—	$	361
	Total Liabilities	$	—	$	361	$	—	$	361
	December 31, 2012
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	3,493	$	83,078	$	—	$	86,571
	Mortgage backed securities		—		239,559		—		239,559
	Obligations of states and political subdivisions		—		38,620		—		38,620
	Corporate debt securities		—		13,444		—		13,444
	Equity securities		2,010		13,506		—		15,516
	Total securities available for sale		5,503		388,207		—		393,710
	Non-hedging interest rate derivatives		—		195		—		195
	Total Assets	$	5,503	$	388,402	$	—	$	393,905
	Non-hedging interest rate derivatives	$	—	$	195	$	—	$	195
	Total Liabilities	$	—	$	195	$	—	$	195
Assets are Classified in their Entirety Based on Lowest Level of Input that is Significant to Fair Value Measurement	'
	The following table sets forth the Company’s assets subject to fair value adjustments (impairment) on a nonrecurring basis. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
		Quoted Prices in		Significant		Significant		Total
		Active Markets		Other		Unobservable		Fair Value
		for Identical		Observable		Inputs
		Assets		Inputs		(Level 3)
		(Level 1)		(Level 2)
		(in thousands)
	September 30, 2013
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	26,061	$	26,061
	Loans held for sale		—		901		—		901
	Other real estate owned and other repossessed assets		—		—		2,154		2,154
	December 31, 2012
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	31,531	$	31,531
	Other real estate owned and other repossessed assets		—		—		529		529
Carrying Values and Estimated Fair Values of Company's Financial Instruments	'
	The following table presents the carrying values, fair values and placement in the fair value hierarchy of the Company’s financial instruments as of September 30, 2013 and December 31, 2012:
		Carrying		Fair		Quoted Prices in		Significant		Significant
		Value		Value		Active  Markets		Other		Unobservable
						for Identical		Observable		Inputs
						Assets		Inputs		(Level 3)
						(Level 1)		(Level 2)
		(in thousands)
	September 30, 2013
	Financial Instruments—Assets
	Investment securities held to maturity	$	96,702	$	96,196	$	—	$	91,651	$	4,545
	Federal Home Loan Bank Stock		5,965		5,965		—		5,965		—
	Loans and leases		2,427,684		2,421,527		—		—		2,421,527
	Financial Instruments—Liabilities
	Certificates of Deposit		314,593		315,213		—		315,213		—
	Other borrowings		75,000		78,905		—		78,905		—
	Subordinated debentures		42,548		28,753		—		—		28,753
	Commitments:
	Standby letters of credit		—		7		—		—		7
	31-Dec-12
	Financial Instruments—Assets
	Investment securities held to maturity	$	96,925	$	99,784	$	—	$	87,336	$	12,448
	Federal Home Loan Bank Stock		5,382		5,382		—		5,382		—
	Loans and leases		2,146,843		2,154,507		—		—		2,154,507
	Financial Instruments—Liabilities
	Certificates of Deposit		303,792		305,398		—		305,398		—
	Other borrowings		85,000		91,325		—		91,325		—
	Subordinated debentures		51,548		33,403		—		—		33,403
	Commitments:
	Standby letters of credit		—		4		—		—		4

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Summary Information Regarding Derivatives	'
	The following table presents summary information regarding these derivatives for the periods presented (dollars in thousands):
	September 30, 2013
		Notional Amount			Average Maturity			Weighted Average			Weighted Average		Fair Value
								Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	17,802			7			3.83	%		1 Mo Libor + 2.21	($	361	)
	Customer interest rate swaps		(17,802	)		7			3.83	%		1 Mo Libor + 2.21		361
	December 31, 2012
		Notional Amount			Average Maturity			Weighted Average			Weighted Average		Fair Value
								Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	6,400			10.1			4.625	%		1 Mo Libor + 2.61	$	195
	Customer interest rate swaps		(6,400	)		10.1			4.625	%		1 Mo Libor + 2.61	($	195	)
Enforceable Master Netting Arrangement	'
	The following shows the Company’s transactions that are subject to an enforceable master netting arrangement or other such similar agreements for the periods presented:
	September 30, 2013
	Offsetting of Financial Assets and Derivative Assets										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Assets			Instruments		Received
		Assets			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Customer interest rate swaps	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	Total	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	Offsetting of Financial Liabilities and Derivative Liabilities										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Liabilities			Instruments		Received
		Liabilities			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Third party interest rate swaps	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	Total	$	17,802		($	17,441	)	$	361		$	—	$	—		$	361
	December 31, 2012
	Offsetting of Financial Assets and Derivative Assets										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Assets			Instruments		Received
		Assets			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Third party interest rate swaps	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195
	Total	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195
	Offsetting of Financial Liabilities and Derivative Liabilities										Gross Amounts not Offset in
											the Balance Sheet
		Gross Amounts			Gross Amounts			Net Amounts			Financial		Cash Collateral			Net Amount
		of Recognized			Offset in the			of Liabilities			Instruments		Received
		Liabilities			Balance Sheet			Presented in the
								Balance Sheet
		(in thousands)
	Description
	Customer interest rate swaps	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195
	Total	$	6,400		($	6,205	)	$	195		$	—	$	—		$	195

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Summary of Estimated Fair Value of Acquired Assets and Liabilities	'
	The following table summarizes the estimated fair value of the acquired assets and liabilities (in thousands).
	Consideration Paid
	Lakeland Bancorp stock issued	$	57,419
	Cash Payment		6,460
	Fair value of Somerset Hills stock options converted to Lakeland Bancorp stock options		1,603
	Total Consideration Paid	$	65,482
	Recognized amounts of identifiable assets and liabilities assumed at fair value
	Cash and cash equivalents	$	80,359
	Securities available for sale		1,737
	Securities held to maturity		8,686
	Federal Home Loan Bank stock		493
	Loans and leases		243,888
	Loans held for sale		2,532
	Premises and equipment		5,214
	Identifiable intangible assets		2,712
	Accrued interest receivable and other assets		10,270
	Deposits		(311,801	)
	Other liabilities		(1,877	)
	Total identifiable assets	$	42,213
	Goodwill	$	23,269
Summary of Loans Acquired	'
	The following is a summary of the loans acquired in the Somerset Hills acquisition as of the closing date.
	(in thousands)	Acquired			Acquired		Total
		Credit			Non-Credit		Acquired
		Impaired			Impaired		Loans
		Loans			Loans
	Contractually required principal and interest at acquisition	$	4,507		$	352,148	$	356,655
	Contractual cash flows not expected to be collected (non-accretable difference)		2,541			—		2,541
	Expected cash flows at acquisition	$	1,966		$	352,148	$	354,114
	Interest component of expected cash flows (accretable difference)		361			107,333		107,694
	Fair value of acquired loans, including mortgages held for sale	$	1,605		$	244,815	$	246,420
Summary of Pro Forma Information	'
	The pro forma information shown reflects adjustments related to certain purchase accounting fair value adjustments; amortization of core deposit and other intangibles; and related income tax effects.
	(in thousands)	Actual from			Pro-forma		Pro-forma
		acquisition to			September 30, 2013		September 30, 2012
		September 30, 2013
	Net interest income	$	3,534		$	81,331	$	80,352
	Noninterest income		513			16,624		15,312
	Noninterest expense		2,047			60,024		56,835
	Net income		1,300			20,477		17,573
	Earnings per share:
	Fully diluted				$	0.57	$	0.54

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Schedule of Estimated Future Amortization Expense	'
	The estimated future amortization expense for each of the succeeding five years ended December 31 is as follows (dollars in thousands):
	For the year ended:
	2013	$	123
	2014		464
	2015		415
	2016		366
	2017		316

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

31-May-13

Sep. 30, 2013

Sep. 30, 2012

31-May-13

Sep. 30, 2013

Maximum [Member]

Maximum [Member]

Restricted Stock [Member]

Stock Option [Member]

Stock Option [Member]

2009 Equity Compensation Program [Member]

2009 Equity Compensation Program [Member]

2009 Equity Compensation Program [Member]

2009 Equity Compensation Program [Member]

Somerset's Stock Option Plans [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Non-Employee Directors [Member]

Non_Employee_Directors

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation expense

$669,000

$559,000

'

'

'

$206,000

$173,000

'

'

'

'

'

Unrecognized compensation cost

'

'

'

'

1,600,000

138,000

'

'

'

'

'

'

Weighted average period of expected cost

'

'

'

'

'2 years 10 months 24 days

'2 years 6 months

'

'

'

'

'

'

Granted, Number of shares

'

'

'

'

104,182

'

'

'

104,182

91,269

'

'

Granted, Weighted average price

'

'

'

'

$9.88

'

'

'

$9.88

$9.50

'

'

Vesting period

'

'

'5 years

'5 years

'

'

'

'

'

'

'

'

Granted options to purchase shares

426,372

0

'

'

'

'

'

'

'

'

50,000

376,372

Number of non-employee directors

'

'

'

'

'

'

'

'

'

'

2

'

Weighted average exercise price of shares

$7.03

'

'

'

'

'

'

'

'

'

$9.91

$6.65

Share based compensation arrangement by share based payment award options exercisable description

'

'

'

'

'

'

'

'In five equal installments beginning at the date of grant and continuing on the next four anniversaries of the grant

'

'

'

'

Aggregate intrinsic value of stock options exercised

391,000

'

'

'

'

'

'

'

'

'

'

'

Cash receipts due to exercise of stock options

$709,000

'

'

'

'

'

'

'

'

'

'

'

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Weighted Average Assumptions Used to Estimate Options Using Black-Scholes Option Pricing Model (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Risk-free interest rates	1.55%
Expected dividend yield	2.82%
Expected volatility	45.45%
Expected lives (years)	'7 years
Weighted average fair value of options granted	$3.48

StockBased_Compensation_Option

Stock-Based Compensation - Option Activity under Stock Option Plans (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'
Outstanding, Number of shares, Beginning balance	475,697	'
Issued, Number of shares	426,372	0
Exercised, Number of shares	-98,895	'
Forfeited, Number of shares	-7,826	'
Outstanding, Number of shares, Ending balance	795,348	'
Options exercisable, Number of shares, Ending balance	749,835	'
Outstanding, Weighted average exercise price, Beginning balance	$12.31	'
Issued, Weighted-average grant-date fair value	$7.03	'
Exercised, Weighted average exercise price	$7.18	'
Forfeited, Weighted average exercise price	$12.93	'
Outstanding, Weighted average exercise price, Ending balance	$10.11	'
Options exercisable, Weighted average exercise price, Ending balance	$10.14	'
Outstanding, Weighted average remaining contractual term (in years), Ending balance	'2 years 10 months 17 days	'
Options exercisable, Weighted average remaining contractual term (in years), Ending balance	'2 years 5 months 27 days	'
Outstanding, Aggregate intrinsic value, Beginning balance	$53,853	'
Outstanding, Aggregate intrinsic value, Ending balance	1,504,444	'
Options exercisable, Aggregate intrinsic value, Ending balance	$1,434,088	'

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Company's Restricted Stock (Detail) (Restricted Stock [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Outstanding, Number of shares, Beginning balance	222,556
Granted, Number of shares	104,182
Vested, Number of shares	-65,782
Forfeited, Number of shares	-2,711
Outstanding, Number of shares, Ending balance	258,245
Outstanding, Weighted average price, Beginning balance	$9.15
Granted, Weighted average price	$9.88
Vested, Weighted average price	$8.60
Forfeited, Weighted average price	$9.26
Outstanding, Weighted average price, Ending balance	$9.58

Comprehensive_Income_Component

Comprehensive Income - Components of Other Comprehensive Income (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
Net unrealized gains (losses) on available for sale securities	'	'	'	'
Net unrealized holding gains (losses) arising during period, Before tax amount	$1,765	$1,933	($8,635)	$3,441
Reclassification adjustment for net gains arising during the period, Before tax amount	'	'	-506	-273
Net unrealized gains (losses), Before tax amount	1,765	1,933	-9,141	3,168
Change in minimum pension liability, Before tax amount	8	8	23	23
Other comprehensive income (loss), net, Before tax amount	1,773	1,941	-9,118	3,191
Net unrealized holding gains (losses) arising during period, Tax Benefit (Expense)	-647	-713	3,181	-1,267
Reclassification adjustment for net gains arising during the period, Tax Benefit (Expense)	'	'	177	96
Net unrealized gains (losses), Tax Benefit (Expense)	-647	-713	3,358	-1,171
Change in minimum pension liability, Tax Benefit (Expense)	-3	-3	-8	-8
Other comprehensive income (loss), net, Tax Benefit (Expense)	-650	-716	3,350	-1,179
Net unrealized holding gains (losses) arising during period, Net of tax amount	1,118	1,220	-5,454	2,174
Reclassification adjustment for net gains arising during the period, Net of tax amount	0	0	-329	-177
Net unrealized gains (losses), Net of tax amount	1,118	1,220	-5,783	1,997
Change in minimum pension liability, Net of tax amount	5	5	15	15
Other Comprehensive Income (Loss)	$1,123	$1,225	($5,768)	$2,012

Comprehensive_Income_Summary_o

Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income by Component (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
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	($2,955)	$3,658	$3,936	$2,871
Other comprehensive income (loss) before classifications	1,123	1,225	-5,439	2,189
Amounts reclassified from accumulated other comprehensive income	'	'	-329	-177
Net current period other comprehensive income (loss)	1,123	1,225	-5,768	2,012
Ending balance	-1,832	4,883	-1,832	4,883
Unrealized Gains and Losses on Available-for-Sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	-2,348	4,283	4,553	3,506
Other comprehensive income (loss) before classifications	1,118	1,220	-5,454	2,174
Amounts reclassified from accumulated other comprehensive income	'	'	-329	-177
Net current period other comprehensive income (loss)	1,118	1,220	-5,783	1,997
Ending balance	-1,230	5,503	-1,230	5,503
Pension Items [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	-607	-625	-617	-635
Other comprehensive income (loss) before classifications	5	5	15	15
Amounts reclassified from accumulated other comprehensive income	'	'	'	'
Net current period other comprehensive income (loss)	5	5	15	15
Ending balance	($602)	($620)	($602)	($620)

Statement_of_Cash_Flow_Informa2

Statement of Cash Flow Information, Supplemental Information - Supplemental Schedule of Noncash Investing and Financing Activities (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Supplemental schedule of noncash investing and financing activities:	'	'
Cash paid during the period for income taxes	$8,497	$6,467
Cash paid during the period for interest	7,750	12,504
Transfer of loans and leases into other repossessed assets and other real estate owned	$3,098	$651

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (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
Earnings Per Share [Abstract]	'	'	'	'
Net income available to common shareholders	$6,617	$5,489	$17,628	$15,293
Less: earnings allocated to participating securities	48	49	125	134
Net income allocated to common shareholders	$6,569	$5,440	$17,503	$15,159
Weighted average number of common shares outstanding - basic	35,512	27,550	32,223	26,998
Share-based plans	224	92	131	67
Weighted average number of common shares - diluted	35,736	27,642	32,354	27,065
Basic earnings per share	$0.18	$0.20	$0.54	$0.56
Diluted earnings per share	$0.18	$0.20	$0.54	$0.56

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail) (Stock Option [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Option [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Options to purchase	461,366	569,222	490,307	569,222
Weighted average per share of restricted stock	$12.41	$12.79	$12.29	$12.79

Investment_Securities_Reconcil

Investment Securities - Reconciliation of Available-for-Sale Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$420,455	$386,462
Gross Unrealized Gains	5,003	8,292
Gross Unrealized Losses	-6,896	-1,044
Fair Value	418,562	393,710
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	62,117	86,002
Gross Unrealized Gains	'	577
Gross Unrealized Losses	-1,953	-8
Fair Value	60,164	86,571
Mortgage-Backed Securities, Residential [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	291,961	235,052
Gross Unrealized Gains	3,031	5,086
Gross Unrealized Losses	-3,994	-579
Fair Value	290,998	239,559
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	37,210	36,848
Gross Unrealized Gains	922	1,832
Gross Unrealized Losses	-441	-60
Fair Value	37,691	38,620
Other Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	13,560	13,576
Gross Unrealized Gains	59	189
Gross Unrealized Losses	-215	-321
Fair Value	13,404	13,444
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	15,607	14,984
Gross Unrealized Gains	991	608
Gross Unrealized Losses	-293	-76
Fair Value	$16,305	$15,516

Investment_Securities_Reconcil1

Investment Securities - Reconciliation of Held-to-Maturity Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	$96,702	$96,925
Gross Unrealized Gains	1,390	2,967
Gross Unrealized Losses	-1,896	-108
Fair Value	96,196	99,784
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	15,989	16,089
Gross Unrealized Gains	63	385
Gross Unrealized Losses	-326	'
Fair Value	15,726	16,474
Mortgage-Backed Securities, Residential [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	36,081	39,065
Gross Unrealized Gains	569	1,313
Gross Unrealized Losses	-753	-27
Fair Value	35,897	40,351
Mortgage-Backed Securities, Multifamily [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	2,380	1,421
Gross Unrealized Gains	'	'
Gross Unrealized Losses	-159	-13
Fair Value	2,221	1,408
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	40,710	38,801
Gross Unrealized Gains	594	1,068
Gross Unrealized Losses	-658	-68
Fair Value	40,646	39,801
Other Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	1,542	1,549
Gross Unrealized Gains	164	201
Gross Unrealized Losses	'	'
Fair Value	$1,706	$1,750

Investment_Securities_Summary_

Investment Securities - Summary of Contractual Maturities of Investment Securities Classified as Available for Sale and Held to Maturity (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Available for Sale, Amortized Cost	'	'
Due in one year or less	$5,848	'
Due after one year through five years	36,066	'
Due after five years through ten years	68,169	'
Due after ten years	2,804	'
Total	112,887	'
Total securities, Available for Sale, Amortized Cost	420,455	386,462
Available for Sale, Fair Value	'	'
Due in one year or less	5,896	'
Due after one year through five years	36,365	'
Due after five years through ten years	66,502	'
Due after ten years	2,496	'
Total	111,259	'
Total securities, Available for Sale, Fair Value	418,562	393,710
Held to Maturity, Amortized Cost	'	'
Due in one year or less	6,065	'
Due after one year through five years	14,046	'
Due after five years through ten years	30,659	'
Due after ten years	7,471	'
Total	58,241	'
Total securities, Held to Maturity, Amortized Cost	96,702	96,925
Held to Maturity, Fair Value	'	'
Due in one year or less	6,096	'
Due after one year through five years	14,619	'
Due after five years through ten years	30,206	'
Due after ten years	7,157	'
Total	58,078	'
Total securities, Held to Maturity, Fair Value	96,196	99,784
Mortgage-Backed Securities, Residential [Member]	'	'
Available for Sale, Amortized Cost	'	'
Available for Sale, Amortized Cost	291,961	'
Total securities, Available for Sale, Amortized Cost	291,961	235,052
Available for Sale, Fair Value	'	'
Available for Sale, Fair Value	290,998	'
Held to Maturity, Amortized Cost	'	'
Held to Maturity, Amortized Cost	38,461	'
Held to Maturity, Fair Value	'	'
Held to Maturity, Fair Value	38,118	'
Equity Securities [Member]	'	'
Available for Sale, Amortized Cost	'	'
Available for Sale, Amortized Cost	15,607	'
Total securities, Available for Sale, Amortized Cost	15,607	14,984
Available for Sale, Fair Value	'	'
Available for Sale, Fair Value	16,305	'
Held to Maturity, Amortized Cost	'	'
Held to Maturity, Amortized Cost	'	'
Held to Maturity, Fair Value	'	'
Held to Maturity, Fair Value	'	'

Investment_Securities_Sales_of

Investment Securities - Sales of Securities, Gross Gains and Gross Losses on Sales of Securities (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]	'	'	'	'
Sale proceeds	'	'	$53,670	$53,718
Gross gains	'	'	509	584
Gross losses	'	'	($3)	($311)

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]	'	'
Securities, carrying value	$334.50	$328.40
Net amortized cost of equities	2.4	'
Market value of equities	3.4	'
Equity securities included in investment funds	12.9	'
Investment in community development loans	2.9	'
Redemption of funds	'60 days	'
Investment in community development loans mortgage-backed securities, small business loans	10	'
Amortized cost of securities	10.3	'
Fair value of securities	$10	'

Investment_Securities_Reconcil2

Investment Securities - Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Security	Security
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	$206,084	$41,797
Available for Sale, Less than 12 months, Unrealized Losses	6,257	716
Available for Sale, 12 months or longer, Fair value	13,825	8,900
Available for Sale, 12 months or longer, Unrealized Losses	639	328
Available for Sale, Number of securities	68	22
Available for Sale, Total, Fair value	219,909	50,697
Available for Sale, Total, Unrealized Losses	6,896	1,044
Held to Maturity, Less than 12 months, Fair value	49,657	6,352
Held to Maturity, Less than 12 months, Unrealized Losses	1,892	103
Held to Maturity, 12 months or longer, Fair value	351	371
Held to Maturity, 12 months or longer, Unrealized Losses	4	5
Held to Maturity, Number of securities	57	12
Held to Maturity, Total, Fair value	50,008	6,723
Held to Maturity, Total, Unrealized Losses	1,896	108
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	60,164	3,992
Available for Sale, Less than 12 months, Unrealized Losses	1,953	8
Available for Sale, 12 months or longer, Fair value	'	'
Available for Sale, 12 months or longer, Unrealized Losses	'	'
Available for Sale, Number of securities	13	1
Available for Sale, Total, Fair value	60,164	3,992
Available for Sale, Total, Unrealized Losses	1,953	8
Held to Maturity, Less than 12 months, Fair value	10,658	'
Held to Maturity, Less than 12 months, Unrealized Losses	326	'
Held to Maturity, 12 months or longer, Fair value	'	'
Held to Maturity, 12 months or longer, Unrealized Losses	'	'
Held to Maturity, Number of securities	2	'
Held to Maturity, Total, Fair value	10,658	'
Held to Maturity, Total, Unrealized Losses	326	'
Mortgage-Backed Securities, Residential [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	129,802	30,359
Available for Sale, Less than 12 months, Unrealized Losses	3,734	572
Available for Sale, 12 months or longer, Fair value	6,251	3,239
Available for Sale, 12 months or longer, Unrealized Losses	260	7
Available for Sale, Number of securities	35	10
Available for Sale, Total, Fair value	136,053	33,598
Available for Sale, Total, Unrealized Losses	3,994	579
Held to Maturity, Less than 12 months, Fair value	22,325	1,239
Held to Maturity, Less than 12 months, Unrealized Losses	753	27
Held to Maturity, 12 months or longer, Fair value	'	'
Held to Maturity, 12 months or longer, Unrealized Losses	'	'
Held to Maturity, Number of securities	9	1
Held to Maturity, Total, Fair value	22,325	1,239
Held to Maturity, Total, Unrealized Losses	753	27
Mortgage-Backed Securities, Multifamily [Member]	'	'
Investment [Line Items]	'	'
Held to Maturity, Less than 12 months, Fair value	2,221	1,408
Held to Maturity, Less than 12 months, Unrealized Losses	159	13
Held to Maturity, 12 months or longer, Fair value	'	'
Held to Maturity, 12 months or longer, Unrealized Losses	'	'
Held to Maturity, Number of securities	2	1
Held to Maturity, Total, Fair value	2,221	1,408
Held to Maturity, Total, Unrealized Losses	159	13
Obligations of States and Political Subdivisions [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	6,122	2,825
Available for Sale, Less than 12 months, Unrealized Losses	298	60
Available for Sale, 12 months or longer, Fair value	1,585	'
Available for Sale, 12 months or longer, Unrealized Losses	143	'
Available for Sale, Number of securities	15	7
Available for Sale, Total, Fair value	7,707	2,825
Available for Sale, Total, Unrealized Losses	441	60
Held to Maturity, Less than 12 months, Fair value	14,453	3,705
Held to Maturity, Less than 12 months, Unrealized Losses	654	63
Held to Maturity, 12 months or longer, Fair value	351	371
Held to Maturity, 12 months or longer, Unrealized Losses	4	5
Held to Maturity, Number of securities	44	10
Held to Maturity, Total, Fair value	14,804	4,076
Held to Maturity, Total, Unrealized Losses	658	68
Other Debt Securities [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	'	'
Available for Sale, Less than 12 months, Unrealized Losses	'	'
Available for Sale, 12 months or longer, Fair value	5,764	5,661
Available for Sale, 12 months or longer, Unrealized Losses	215	321
Available for Sale, Number of securities	2	2
Available for Sale, Total, Fair value	5,764	5,661
Available for Sale, Total, Unrealized Losses	215	321
Equity Securities [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	9,996	4,621
Available for Sale, Less than 12 months, Unrealized Losses	272	76
Available for Sale, 12 months or longer, Fair value	225	'
Available for Sale, 12 months or longer, Unrealized Losses	21	'
Available for Sale, Number of securities	3	2
Available for Sale, Total, Fair value	10,221	4,621
Available for Sale, Total, Unrealized Losses	$293	$76

Loans_and_Leases_Composition_o

Loans and Leases - Composition of Lakeland`s Loan and Lease Portfolio (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	$2,428,750	$2,147,207
Plus: deferred fees	-1,066	-364
Loans, net of deferred fees	2,427,684	2,146,843
Commercial, Secured by Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,348,314	1,125,137
Commercial, Industrial and Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	214,877	216,129
Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	37,845	26,781
Real Estate - Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	437,788	423,262
Real Estate - Construction [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	50,121	46,272
Home Equity and Consumer [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	$339,805	$309,626

Loans_and_Leases_Additional_In

Loans and Leases - Additional Information (Detail) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Residential loans pledged for potential borrowings at the Federal Home Loan Bank of New York	$273,300,000	'	$203,100,000
Carrying value of loans acquired	1,600,000	'	'
Interest income on the loans acquired	43,000	'	'
Non-accrual loans included of troubled debt restructurings	2,300,000	'	3,400,000
Interest accrued on impaired loans	1,700,000	2,100,000	2,800,000
Unfunded lending reserve	1,100,000	'	1,100,000
Mortgages held for sale	901,000	'	'
Leases held for sale	0	'	0
Other repossessed assets owned	44,000	'	77,000
Other real estate owned	2,100,000	'	452,000
Home Equity and Consumer [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Overdraft balances included in home equity and consumer loans	$381,000	'	$532,000

Loans_and_Leases_Companys_NonP

Loans and Leases - Company's Non-Performing Assets and its Accruing Troubled Debt Restructurings (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	$16,505	$27,980
Other real estate and other repossessed assets	2,154	529
TOTAL NON-PERFORMING ASSETS	18,659	28,509
Troubled debt restructurings, still accruing	11,006	7,336
Commercial, Secured by Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	6,585	10,511
Commercial, Industrial and Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	184	1,476
Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	'	32
Real Estate - Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	5,996	8,733
Real Estate - Construction [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	921	4,031
Home Equity and Consumer [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	$2,819	$3,197

Loans_and_Leases_Age_Analysis_

Loans and Leases - Age Analysis of Past Due Loans, Segregated 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]	'	'
30-59 Days Past Due	$15,060	$10,547
60-89 Days Past Due	6,133	3,699
Greater Than 89 Days	18,988	29,417
Total Past Due	40,181	43,663
Current	2,388,569	2,103,544
Total Loans and Leases	2,428,750	2,147,207
Recorded Investment greater than 89 Days and still accruing	2,483	1,437
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	9,075	3,831
60-89 Days Past Due	3,783	2,308
Greater Than 89 Days	7,222	10,511
Total Past Due	20,080	16,650
Current	1,328,234	1,108,487
Total Loans and Leases	1,348,314	1,125,137
Recorded Investment greater than 89 Days and still accruing	637	'
Commercial, Industrial and Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	191	400
60-89 Days Past Due	571	171
Greater Than 89 Days	192	1,476
Total Past Due	954	2,047
Current	213,923	214,082
Total Loans and Leases	214,877	216,129
Recorded Investment greater than 89 Days and still accruing	8	'
Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	12	367
60-89 Days Past Due	'	36
Greater Than 89 Days	'	32
Total Past Due	12	435
Current	37,833	26,346
Total Loans and Leases	37,845	26,781
Recorded Investment greater than 89 Days and still accruing	'	'
Real Estate - Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	3,261	2,370
60-89 Days Past Due	1,085	821
Greater Than 89 Days	6,942	10,012
Total Past Due	11,288	13,203
Current	426,500	410,059
Total Loans and Leases	437,788	423,262
Recorded Investment greater than 89 Days and still accruing	946	1,279
Real Estate - Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	'	1,100
60-89 Days Past Due	'	'
Greater Than 89 Days	921	4,031
Total Past Due	921	5,131
Current	49,200	41,141
Total Loans and Leases	50,121	46,272
Recorded Investment greater than 89 Days and still accruing	'	'
Home Equity and Consumer [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	2,521	2,479
60-89 Days Past Due	694	363
Greater Than 89 Days	3,711	3,355
Total Past Due	6,926	6,197
Current	332,879	303,429
Total Loans and Leases	339,805	309,626
Recorded Investment greater than 89 Days and still accruing	$892	$158

Loans_and_Leases_Impaired_Loan

Loans and Leases - Impaired Loans with and without Specific Allowance (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	$26,601	$29,151	$31,531
Contractual Unpaid Principal Balance	29,605	35,541	39,067
Specific Allowance	1,438	726	873
Interest Income Recognized	617	418	724
Average Investment in Impaired loans	28,216	34,185	35,764
Commercial, Secured by Real Estate [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	18,867	17,390	19,804
Contractual Unpaid Principal Balance	20,242	22,148	25,753
Specific Allowance	1,044	313	368
Interest Income Recognized	435	305	541
Average Investment in Impaired loans	18,687	19,994	22,126
Commercial, Secured by Real Estate [Member] | Loans Without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	7,098	14,263	16,458
Contractual Unpaid Principal Balance	7,352	18,253	21,665
Specific Allowance	'	'	'
Interest Income Recognized	137	260	495
Average Investment in Impaired loans	7,663	15,605	18,301
Commercial, Secured by Real Estate [Member] | Loans With Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	11,769	3,127	3,346
Contractual Unpaid Principal Balance	12,890	3,895	4,088
Specific Allowance	1,044	313	368
Interest Income Recognized	298	45	46
Average Investment in Impaired loans	11,024	4,389	3,825
Commercial, Industrial and Other [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	4,425	5,714	5,704
Contractual Unpaid Principal Balance	4,500	5,840	5,803
Specific Allowance	78	216	219
Interest Income Recognized	148	67	117
Average Investment in Impaired loans	5,087	4,196	4,607
Commercial, Industrial and Other [Member] | Loans Without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	4,037	4,927	4,896
Contractual Unpaid Principal Balance	4,002	4,938	4,932
Specific Allowance	'	'	'
Interest Income Recognized	142	67	116
Average Investment in Impaired loans	4,428	3,555	3,838
Commercial, Industrial and Other [Member] | Loans With Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	388	787	808
Contractual Unpaid Principal Balance	498	902	871
Specific Allowance	78	216	219
Interest Income Recognized	6	'	1
Average Investment in Impaired loans	659	641	769
Real Estate - Residential Mortgage [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	479	654	648
Contractual Unpaid Principal Balance	479	654	648
Specific Allowance	72	43	43
Interest Income Recognized	'	10	10
Average Investment in Impaired loans	497	770	759
Real Estate - Residential Mortgage [Member] | Loans Without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	'	366	360
Contractual Unpaid Principal Balance	'	366	360
Specific Allowance	'	'	'
Interest Income Recognized	'	6	6
Average Investment in Impaired loans	'	386	385
Real Estate - Residential Mortgage [Member] | Loans With Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	479	288	288
Contractual Unpaid Principal Balance	479	288	288
Specific Allowance	72	43	43
Interest Income Recognized	'	4	4
Average Investment in Impaired loans	497	384	374
Real Estate - Construction [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	921	4,097	4,030
Contractual Unpaid Principal Balance	3,015	5,603	5,518
Specific Allowance	41	12	97
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	2,635	7,942	6,978
Real Estate - Construction [Member] | Loans Without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	'	3,977	3,332
Contractual Unpaid Principal Balance	'	4,606	4,433
Specific Allowance	'	'	'
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	1,328	7,611	5,533
Real Estate - Construction [Member] | Loans With Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	921	120	698
Contractual Unpaid Principal Balance	3,015	997	1,085
Specific Allowance	41	12	97
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	1,307	331	1,445
Home Equity and Consumer [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	1,369	1,296	1,345
Contractual Unpaid Principal Balance	1,369	1,296	1,345
Specific Allowance	203	142	146
Interest Income Recognized	34	36	56
Average Investment in Impaired loans	1,310	1,283	1,294
Home Equity and Consumer [Member] | Loans Without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	18	350	369
Contractual Unpaid Principal Balance	18	350	369
Specific Allowance	'	'	'
Interest Income Recognized	1	'	1
Average Investment in Impaired loans	18	337	360
Home Equity and Consumer [Member] | Loans With Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	1,351	946	976
Contractual Unpaid Principal Balance	1,351	946	976
Specific Allowance	203	142	146
Interest Income Recognized	33	36	55
Average Investment in Impaired loans	$1,292	$946	$934

Loans_and_Leases_Companys_Comm

Loans and Leases - Company's Commercial Loan Portfolio (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	$1,348,314	$1,125,137
Commercial, Secured by Real Estate [Member] | Pass 1 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Commercial, Secured by Real Estate [Member] | Pass 2 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Commercial, Secured by Real Estate [Member] | Pass 3 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	71,453	44,448
Commercial, Secured by Real Estate [Member] | Pass 4 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	420,190	350,145
Commercial, Secured by Real Estate [Member] | Pass 5 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	733,677	623,912
Commercial, Secured by Real Estate [Member] | Watch [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	38,488	43,515
Commercial, Secured by Real Estate [Member] | Other Assets Especially Mentioned [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	28,003	21,132
Commercial, Secured by Real Estate [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	56,418	41,817
Commercial, Secured by Real Estate [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	85	168
Commercial, Secured by Real Estate [Member] | Loss [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Commercial, Industrial and Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	214,877	216,129
Commercial, Industrial and Other [Member] | Pass 1 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	774	996
Commercial, Industrial and Other [Member] | Pass 2 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	16,089	12,899
Commercial, Industrial and Other [Member] | Pass 3 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	9,822	15,676
Commercial, Industrial and Other [Member] | Pass 4 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	57,793	62,676
Commercial, Industrial and Other [Member] | Pass 5 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	87,859	88,033
Commercial, Industrial and Other [Member] | Watch [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	11,150	13,261
Commercial, Industrial and Other [Member] | Other Assets Especially Mentioned [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	8,730	2,845
Commercial, Industrial and Other [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	22,660	19,743
Commercial, Industrial and Other [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Commercial, Industrial and Other [Member] | Loss [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Real Estate - Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	50,121	46,272
Real Estate - Construction [Member] | Pass 1 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Real Estate - Construction [Member] | Pass 2 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Real Estate - Construction [Member] | Pass 3 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Real Estate - Construction [Member] | Pass 4 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	795
Real Estate - Construction [Member] | Pass 5 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	46,515	34,682
Real Estate - Construction [Member] | Watch [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Real Estate - Construction [Member] | Other Assets Especially Mentioned [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	2,639	6,535
Real Estate - Construction [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	967	4,260
Real Estate - Construction [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
Real Estate - Construction [Member] | Loss [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'

Loans_and_Leases_Allowance_for

Loans and Leases - Allowance for Loan and Lease Losses by Portfolio Segment and Related Recorded Investment in Loans and Leases (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	$28,931	$28,416	$28,416
Charge-offs	'	'	-8,308	'	-16,019
Recoveries	'	'	1,478	'	1,627
Provision	1,879	3,350	7,656	11,783	14,907
Ending Balance	29,757	'	29,757	'	28,931
Ending Balance: Individually evaluated for impairment	1,438	'	1,438	'	873
Ending Balance: Collectively evaluated for impairment	28,319	'	28,319	'	28,058
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	26,061	'	26,061	'	31,531
Ending Balance: Collectively evaluated for impairment	2,401,057	'	2,401,057	'	2,115,676
Ending Balance: Loans acquired with deteriorated credit quality	1,632	'	1,632	'	'
Ending Balance	2,428,750	'	2,428,750	'	2,147,207
Commercial, Secured by Real Estate [Member]	'	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	16,258	16,618	16,618
Charge-offs	'	'	-1,192	'	-7,287
Recoveries	'	'	955	'	280
Provision	'	'	1,684	'	6,647
Ending Balance	17,705	'	17,705	'	16,258
Ending Balance: Individually evaluated for impairment	1,044	'	1,044	'	368
Ending Balance: Collectively evaluated for impairment	16,661	'	16,661	'	15,890
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Commercial, Secured by Real Estate [Member] | Loans and Leases [Member]	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	18,867	'	18,867	'	19,804
Ending Balance: Collectively evaluated for impairment	1,328,185	'	1,328,185	'	1,105,333
Ending Balance: Loans acquired with deteriorated credit quality	1,262	'	1,262	'	'
Ending Balance	1,348,314	'	1,348,314	'	1,125,137
Commercial, Industrial and Other [Member]	'	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	5,103	3,477	3,477
Charge-offs	'	'	-1,103	'	-949
Recoveries	'	'	139	'	428
Provision	'	'	971	'	2,147
Ending Balance	5,110	'	5,110	'	5,103
Ending Balance: Individually evaluated for impairment	78	'	78	'	219
Ending Balance: Collectively evaluated for impairment	5,032	'	5,032	'	4,884
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Commercial, Industrial and Other [Member] | Loans and Leases [Member]	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	4,425	'	4,425	'	5,704
Ending Balance: Collectively evaluated for impairment	210,452	'	210,452	'	210,425
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Ending Balance	214,877	'	214,877	'	216,129
Leases [Member]	'	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	578	688	688
Charge-offs	'	'	-206	'	-999
Recoveries	'	'	119	'	504
Provision	'	'	17	'	385
Ending Balance	508	'	508	'	578
Ending Balance: Individually evaluated for impairment	'	'	'	'	'
Ending Balance: Collectively evaluated for impairment	508	'	508	'	578
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Leases [Member] | Loans and Leases [Member]	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	'	'	'	'	'
Ending Balance: Collectively evaluated for impairment	37,845	'	37,845	'	26,781
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Ending Balance	37,845	'	37,845	'	26,781
Real Estate - Residential Mortgage [Member]	'	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	3,568	3,077	3,077
Charge-offs	'	'	-903	'	-1,822
Recoveries	'	'	97	'	66
Provision	'	'	423	'	2,247
Ending Balance	3,185	'	3,185	'	3,568
Ending Balance: Individually evaluated for impairment	72	'	72	'	43
Ending Balance: Collectively evaluated for impairment	3,113	'	3,113	'	3,525
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Real Estate - Residential Mortgage [Member] | Loans and Leases [Member]	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	479	'	479	'	648
Ending Balance: Collectively evaluated for impairment	437,309	'	437,309	'	422,614
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Ending Balance	437,788	'	437,788	'	423,262
Real Estate - Construction [Member]	'	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	587	1,424	1,424
Charge-offs	'	'	-3,652	'	-2,888
Recoveries	'	'	12	'	43
Provision	'	'	3,431	'	2,008
Ending Balance	378	'	378	'	587
Ending Balance: Individually evaluated for impairment	41	'	41	'	97
Ending Balance: Collectively evaluated for impairment	337	'	337	'	490
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Real Estate - Construction [Member] | Loans and Leases [Member]	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	921	'	921	'	4,030
Ending Balance: Collectively evaluated for impairment	49,200	'	49,200	'	42,242
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Ending Balance	50,121	'	50,121	'	46,272
Home Equity and Consumer [Member]	'	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'	'
Beginning Balance	'	'	2,837	3,132	3,132
Charge-offs	'	'	-1,252	'	-2,074
Recoveries	'	'	156	'	306
Provision	'	'	1,130	'	1,473
Ending Balance	2,871	'	2,871	'	2,837
Ending Balance: Individually evaluated for impairment	203	'	203	'	146
Ending Balance: Collectively evaluated for impairment	2,668	'	2,668	'	2,691
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'
Home Equity and Consumer [Member] | Loans and Leases [Member]	'	'	'	'	'
Loans and Leases:	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	1,369	'	1,369	'	1,345
Ending Balance: Collectively evaluated for impairment	338,066	'	338,066	'	308,281
Ending Balance: Loans acquired with deteriorated credit quality	370	'	370	'	'
Ending Balance	$339,805	'	$339,805	'	$309,626

Loans_and_Leases_Summary_of_Re

Loans and Leases - Summary of Restructured 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
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	5	13	12
Pre-Modification Outstanding Recorded Investment	'	$577	$5,610	$5,755
Post-Modification Outstanding Recorded Investment	'	484	5,604	5,625
Commercial, Secured by Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	3	11	8
Pre-Modification Outstanding Recorded Investment	'	521	5,472	1,524
Post-Modification Outstanding Recorded Investment	'	432	5,468	1,407
Commercial, Industrial and Other [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	2	1	4
Pre-Modification Outstanding Recorded Investment	'	56	127	4,231
Post-Modification Outstanding Recorded Investment	'	52	125	4,218
Leases [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	'	'	'
Post-Modification Outstanding Recorded Investment	'	'	'	'
Real Estate - Residential Mortgage [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	'	'	'
Post-Modification Outstanding Recorded Investment	'	'	'	'
Real Estate - Construction [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	'	'	'
Post-Modification Outstanding Recorded Investment	'	'	'	'
Home Equity and Consumer [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	1	'
Pre-Modification Outstanding Recorded Investment	'	'	11	'
Post-Modification Outstanding Recorded Investment	'	'	$11	'

Loans_and_Leases_Summary_of_Re1

Loans and Leases - Summary of Restructured Debt within Last 12 Months that have Subsequently Defaulted (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	5	3
Recorded Investment	$3,084	$329
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	5	2
Recorded Investment	3,084	267
Commercial, Industrial and Other [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	1
Recorded Investment	'	62
Leases [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Real Estate - Residential Mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Real Estate - Construction [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
Home Equity and Consumer [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'

Loans_and_Leases_Summary_of_Ga

Loans and Leases - Summary of Gains on Leasing Related Assets (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
Receivables [Abstract]	'	'	'	'
Gains (losses) on sales of leases	'	'	'	'
Realized gains on paid off leases	20	92	51	365
Gains on other repossessed assets	'	8	12	38
Total gains on leasing related assets	$20	$100	$63	$403

Employee_Benefit_Plans_Compone

Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan (Detail) (Pension Plans, Defined Benefit [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
Pension Plans, Defined Benefit [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Interest cost	$22	$22	$67	$65
Expected return on plan assets	-18	-19	-54	-57
Amortization of unrecognized net actuarial loss	21	18	62	54
Net periodic benefit expense	$25	$21	$75	$62

Directors_Retirement_Plan_Comp

Directors' Retirement Plan - Components of Net Periodic Plan Costs for Retirement Plan (Detail) (Directors Retirement Plan [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
Directors Retirement Plan [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$8	$8	$22	$23
Interest cost	9	11	27	31
Amortization of prior service cost	3	3	10	10
Amortization of unrecognized net actuarial loss	2	3	6	9
Net periodic benefit expense	$22	$25	$65	$73

Directors_Retirement_Plan_Addi

Directors' Retirement Plan - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Compensation And Retirement Disclosure [Abstract]	'	'
Contributions made by company to plans	$75,000	$88,000

Estimated_Fair_Value_of_Financ2

Estimated Fair Value of Financial Instruments and Fair Value Measurement - Financial Assets and Liabilities are Classified (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'	'
Investment securities, available for sale	$418,562	$393,710
Fair Value, Measurements, Recurring [Member]	'	'
Assets:	'	'
Investment securities, available for sale	418,562	393,710
Total Assets	418,923	393,905
Total Liabilities	361	195
Fair Value, Measurements, Recurring [Member] | Non-hedging [Member] | Interest Rate Derivatives [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Liabilities	361	195
Assets:	'	'
Other Assets	361	195
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	7,107	5,503
Total Assets	7,107	5,503
Total Liabilities	'	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Non-hedging [Member] | Interest Rate Derivatives [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Liabilities	'	'
Assets:	'	'
Other Assets	'	'
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	411,455	388,207
Total Assets	411,816	388,402
Total Liabilities	361	195
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-hedging [Member] | Interest Rate Derivatives [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Liabilities	361	195
Assets:	'	'
Other Assets	361	195
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Total Assets	'	'
Total Liabilities	'	'
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Non-hedging [Member] | Interest Rate Derivatives [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Other Liabilities	'	'
Assets:	'	'
Other Assets	'	'
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]	'	'
Assets:	'	'
Investment securities, available for sale	60,164	86,571
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	4,366	3,493
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	55,798	83,078
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member]	'	'
Assets:	'	'
Investment securities, available for sale	290,998	239,559
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	290,998	239,559
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Assets:	'	'
Investment securities, available for sale	37,691	38,620
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	37,691	38,620
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]	'	'
Assets:	'	'
Investment securities, available for sale	13,404	13,444
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	13,404	13,444
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Assets:	'	'
Investment securities, available for sale	16,305	15,516
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	2,741	2,010
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	13,564	13,506
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Investment securities, available for sale	'	'

Estimated_Fair_Value_of_Financ3

Estimated Fair Value of Financial Instruments and Fair Value Measurement - Assets are Classified in their Entirety Based on Lowest Level of Input that is Significant to Fair Value Measurement (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]	'	'
Impaired Loans and Leases	$26,061	$31,531
Loans held for sale	901	'
Other real estate owned and other repossessed assets	2,154	529
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired Loans and Leases	'	'
Loans held for sale	'	'
Other real estate owned and other repossessed assets	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired Loans and Leases	'	'
Loans held for sale	901	'
Other real estate owned and other repossessed assets	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired Loans and Leases	26,061	31,531
Loans held for sale	'	'
Other real estate owned and other repossessed assets	$2,154	$529

Estimated_Fair_Value_of_Financ4

Estimated Fair Value of Financial Instruments and Fair Value Measurement - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Short-term municipal bond	4.5
Minimum [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Discount rates	5.00%
Capitalization rates	5.00%
Maximum [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Discount rates	11.00%
Capitalization rates	9.00%

Estimated_Fair_Value_of_Financ5

Estimated Fair Value of Financial Instruments and Fair Value Measurement - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial Instruments - Assets	'	'
Investment securities held to maturity	$96,196	$99,784
Loans and leases	2,428,750	2,147,207
Carrying Value [Member]	'	'
Financial Instruments - Assets	'	'
Investment securities held to maturity	96,702	96,925
Federal Home Loan Bank Stock	5,965	5,382
Loans and leases	2,427,684	2,146,843
Financial Instruments - Liabilities	'	'
Certificates of Deposit	314,593	303,792
Other borrowings	75,000	85,000
Subordinated debentures	42,548	51,548
Commitments:	'	'
Standby letters of credit	'	'
Fair Value [Member]	'	'
Financial Instruments - Assets	'	'
Investment securities held to maturity	96,196	99,784
Federal Home Loan Bank Stock	5,965	5,382
Loans and leases	2,421,527	2,154,507
Financial Instruments - Liabilities	'	'
Certificates of Deposit	315,213	305,398
Other borrowings	78,905	91,325
Subordinated debentures	28,753	33,403
Commitments:	'	'
Standby letters of credit	7	4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Financial Instruments - Assets	'	'
Investment securities held to maturity	'	'
Federal Home Loan Bank Stock	'	'
Loans and leases	'	'
Financial Instruments - Liabilities	'	'
Certificates of Deposit	'	'
Other borrowings	'	'
Subordinated debentures	'	'
Commitments:	'	'
Standby letters of credit	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Financial Instruments - Assets	'	'
Investment securities held to maturity	91,651	87,336
Federal Home Loan Bank Stock	5,965	5,382
Loans and leases	'	'
Financial Instruments - Liabilities	'	'
Certificates of Deposit	315,213	305,398
Other borrowings	78,905	91,325
Subordinated debentures	'	'
Commitments:	'	'
Standby letters of credit	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Financial Instruments - Assets	'	'
Investment securities held to maturity	4,545	12,448
Federal Home Loan Bank Stock	'	'
Loans and leases	2,421,527	2,154,507
Financial Instruments - Liabilities	'	'
Certificates of Deposit	'	'
Other borrowings	'	'
Subordinated debentures	28,753	33,403
Commitments:	'	'
Standby letters of credit	$7	$4

Derivatives_Additional_Informa

Derivatives - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'	'
Securities pledged for collateral	$1,500,000	$497,000

Derivatives_Summary_Informatio

Derivatives - Summary Information Regarding Derivatives (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
3rd Party Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Amount Average	$17,802	$6,400
Average Maturity	'7 years	'10 years 1 month 6 days
Weighted Average Rate Fixed	3.83%	4.63%
Weighted Average Variable Rate, Description	'1 Mo Libor + 2.21	'1 Mo Libor + 2.61
Fair Value	-361	195
Customer Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Amount Average	-17,802	-6,400
Average Maturity	'7 years	'10 years 1 month 6 days
Weighted Average Rate Fixed	3.83%	4.63%
Weighted Average Variable Rate, Description	'1 Mo Libor + 2.21	'1 Mo Libor + 2.61
Fair Value	$361	($195)

Derivatives_Enforceable_Master

Derivatives - Enforceable Master Netting Arrangement (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Gross Amounts of Recognized Assets	$17,802	$6,400
Gross Amounts Offset in the Balance Sheet, Assets	-17,441	-6,205
Fair Value, Assets	361	195
Financial Instruments, Assets	'	'
Cash Collateral Received, Assets	'	'
Fair Value, Assets	361	195
Gross Amounts of Recognized Liabilities	17,802	6,400
Gross Amounts Offset in the Balance Sheet, Liabilities	-17,441	-6,205
Fair Value, Liabilities	361	195
Financial Instruments, Liabilities	'	'
Cash Collateral Received, Liabilities	'	'
Fair Value, Liabilities	361	195
Customer Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts of Recognized Assets	17,802	'
Gross Amounts Offset in the Balance Sheet, Assets	-17,441	'
Fair Value, Assets	361	'
Financial Instruments, Assets	'	'
Cash Collateral Received, Assets	'	'
Fair Value, Assets	361	'
Gross Amounts of Recognized Liabilities	'	6,400
Gross Amounts Offset in the Balance Sheet, Liabilities	'	-6,205
Fair Value, Liabilities	'	195
Financial Instruments, Liabilities	'	'
Cash Collateral Received, Liabilities	'	'
Fair Value, Liabilities	'	195
3rd Party Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts of Recognized Assets	'	6,400
Gross Amounts Offset in the Balance Sheet, Assets	'	-6,205
Fair Value, Assets	'	195
Financial Instruments, Assets	'	'
Cash Collateral Received, Assets	'	'
Fair Value, Assets	'	195
Gross Amounts of Recognized Liabilities	17,802	'
Gross Amounts Offset in the Balance Sheet, Liabilities	-17,441	'
Fair Value, Liabilities	361	'
Financial Instruments, Liabilities	'	'
Cash Collateral Received, Liabilities	'	'
Fair Value, Liabilities	$361	'

Preferred_Stock_Additional_Inf

Preferred Stock - Additional Information (Detail) (USD $)	0 Months Ended
	Feb. 08, 2012	Feb. 29, 2012
Class of Stock [Line Items]	'	'
Treasury stock amount paid	$19,200,000	'
Treasury stock amount paid, principal amount	19,000,000	'
Treasury stock amount paid, accrued and unpaid dividends	219,000	'
Accretion of preferred stock discount	501,000	'
Shares of common stock for which warrant previously issued for treasury	'	1,046,901
Repurchase price of common stock	'	2,800,000
Common stock warrant carrying value	'	$3,300,000
Series A Preferred Stock [Member]	'	'
Class of Stock [Line Items]	'	'
Fixed Rate Cumulative Preferred Stock redemption	19,000	'
Treasury Stock [Member]	'	'
Class of Stock [Line Items]	'	'
Treasury stock, per share value	'	$8.45

Common_Stock_Additional_Inform

Common Stock - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended				9 Months Ended
	Sep. 04, 2012	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Oct. 07, 2012	Sep. 30, 2013
						Lakeland Capital Trust lll [Member]
Class of Stock [Line Items]	'	'	'	'	'	'
Sold shares of common stock to institutional investors	2,667,253	'	35,823,147	29,941,967	'	'
Common stock price per share	$9.65	'	'	'	'	'
Common stock net proceeds	$25,000,000	$25,021,000	'	'	'	'
Junior subordinated debentures redeemed	'	'	'	'	$25,800,000	'
Junior subordinated debentures a coupon rate	'	'	'	'	'	7.54%
Junior subordinated debentures maturity date	'	'	'	'	'	'2034-01-07

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	31-May-13	Sep. 30, 2013
					Somerset Hills Bancorp [Member]	Somerset Hills Bancorp [Member]
Business Acquisition, Contingent Consideration [Line Items]	'	'	'	'	'	'
Date of Agreement	'	'	'	'	'	31-May-13
Shares received by the Somerset Hills Bancorp at the time of merger	'	'	'	'	$1.20	'
Cash received by the Somerset Hills Bancorp at the time of merger	'	'	'	'	$12	'
Percentage of aggregate merger consideration in shares	'	'	'	'	90.00%	'
Percentage of aggregate merger consideration in cash	'	'	'	'	10.00%	'
Common stock expected to issue	'	'	'	'	5,794,079	'
Transaction value	'	'	'	'	$6,500,000	'
Core deposit intangible	2,700,000	'	2,700,000	'	'	'
Estimated useful life of deposit intangible	'	'	'10 years	'	'	'
Merger and acquisition integration-related expenses	$744,000	'	$2,827,000	'	'	'

Acquisitions_Summary_of_Estima

Acquisitions - Summary of Estimated Fair Value of Acquired Assets and Liabilities (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]	'	'
Fair value of Somerset Hills stock options converted to Lakeland Bancorp stock options	$1,603	'
Recognized amounts of identifiable assets and liabilities assumed at fair value	'	'
Goodwill	110,381	87,111
Somerset Hills Bancorp [Member]	'	'
Business Acquisition [Line Items]	'	'
Lakeland Bancorp stock issued	57,419	'
Cash Payment	6,460	'
Fair value of Somerset Hills stock options converted to Lakeland Bancorp stock options	1,603	'
Total Consideration Paid	65,482	'
Recognized amounts of identifiable assets and liabilities assumed at fair value	'	'
Cash and cash equivalents	80,359	'
Securities available for sale	1,737	'
Securities held to maturity	8,686	'
Federal Home Loan Bank stock	493	'
Loans and leases	243,888	'
Loans held for sale	2,532	'
Premises and equipment	5,214	'
Identifiable intangible assets	2,712	'
Accrued interest receivable and other assets	10,270	'
Deposits	-311,801	'
Other liabilities	-1,877	'
Total identifiable assets	42,213	'
Goodwill	$23,269	'

Acquisitions_Summary_of_Loans_

Acquisitions - Summary of Loans Acquired (Detail) (Somerset Hills Bancorp [Member], USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Business Acquisition [Line Items]	'
Contractually required principal and interest at acquisition	$356,655
Contractual cash flows not expected to be collected (non-accretable difference)	2,541
Expected cash flows at acquisition	354,114
Interest component of expected cash flows (accretable difference)	107,694
Fair value of acquired loans, including mortgages held for sale	246,420
Acquired Credit Impaired Loans [Member]	'
Business Acquisition [Line Items]	'
Contractually required principal and interest at acquisition	4,507
Contractual cash flows not expected to be collected (non-accretable difference)	2,541
Expected cash flows at acquisition	1,966
Interest component of expected cash flows (accretable difference)	361
Fair value of acquired loans, including mortgages held for sale	1,605
Acquired Non-Credit Impaired Loans [Member]	'
Business Acquisition [Line Items]	'
Contractually required principal and interest at acquisition	352,148
Expected cash flows at acquisition	352,148
Interest component of expected cash flows (accretable difference)	107,333
Fair value of acquired loans, including mortgages held for sale	$244,815

Acquisitions_Summary_of_Pro_Fo

Acquisitions - Summary of Pro Forma Information (Detail) (USD $)	4 Months Ended	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Business Combinations [Abstract]	'	'	'
Net interest income	$3,534	$81,331	$80,352
Noninterest income	513	16,624	15,312
Noninterest expense	2,047	60,024	56,835
Net income	$1,300	$20,477	$17,573
Earnings per share:	'	'	'
Fully diluted	'	$0.57	$0.54

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'	'
Goodwill	$110,381,000	$87,111,000
Core deposit intangible	2,700,000	'
Amortized core deposit intangible	164,000	'
Somerset Hills Acquisition [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Goodwill	23,300,000	'
Core deposit intangible	2,700,000	'
Prior Acquisition [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Goodwill	$87,100,000	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'
2013	$123
2014	464
2015	415
2016	366
2017	$316

Early_Extinguishment_of_Debt_A

Early Extinguishment of Debt - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 18, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013
						Subsequent Event [Member]
Extinguishment of Debt [Line Items]	'	'	'	'	'	'
Extinguished of debt	$9,000,000	'	'	'	'	'
Gain on extinguishment of debt	1,200,000	'	'	1,197,000	'	'
Interest rate on debenture floated at LIBOR plus	3.10%	'	'	'	'	'
Interest on debt extinguishment	3.38%	'	'	'	'	'
Redemption of debt	'	'	'	'	'	$1,000,000