Lakeland Bancorp (LBAI) 10-Q 10 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'LBAI	'
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	'	37,910,617

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS:	'	'
Cash	$122,989	$94,205
Interest-bearing deposits due from banks	4,177	8,516
Total cash and cash equivalents	127,166	102,721
Investment securities available for sale, at fair value	444,292	431,106
Investment securities held to maturity; fair value of $105,127 at September 30, 2014 and $100,394 at December 31, 2013	104,909	101,744
Federal Home Loan Bank and other membership bank stock, at cost	8,831	7,938
Loans held for sale	1,519	1,206
Loans, net of deferred costs (fees)	2,611,765	2,469,016
Less: allowance for loan and lease losses	30,047	29,821
Net loans	2,581,718	2,439,195
Premises and equipment, net	36,049	37,148
Accrued interest receivable	8,512	8,603
Goodwill	109,974	109,974
Other identifiable intangible assets	2,071	2,424
Bank owned life insurance	57,058	55,968
Other assets	16,806	19,764
TOTAL ASSETS	3,498,905	3,317,791
Deposits:	'	'
Noninterest bearing	674,933	600,652
Savings and interest-bearing transaction accounts	1,820,657	1,812,467
Time deposits under $100 thousand	168,391	180,859
Time deposits $100 thousand and over	112,950	115,227
Total deposits	2,776,931	2,709,205
Federal funds purchased and securities sold under agreements to repurchase	112,796	81,991
Other borrowings	179,700	119,000
Subordinated debentures	41,238	41,238
Other liabilities	15,701	14,933
TOTAL LIABILITIES	3,126,366	2,966,367
STOCKHOLDERS' EQUITY	'	'
Common stock, no par value; authorized shares, 70,000,000; issued 37,910,372 shares at September 30, 2014 and 37,873,800 shares at December 31, 2013	383,819	364,637
Accumulated deficit	-11,267	-8,538
Accumulated other comprehensive loss	-13	-4,675
TOTAL STOCKHOLDERS' EQUITY	372,539	351,424
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$3,498,905	$3,317,791

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Investment securities held to maturity; fair value	$105,127	$100,394
Common stock, par value	'	'
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	37,910,372	37,873,800

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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
INTEREST INCOME	'	'	'	'
Loans, leases and fees	$27,949	$27,350	$82,405	$77,122
Federal funds sold and interest-bearing deposits with banks	24	27	46	57
Taxable investment securities and other	2,387	2,017	7,448	5,544
Tax-exempt investment securities	436	461	1,376	1,331
TOTAL INTEREST INCOME	30,796	29,855	91,275	84,054
INTEREST EXPENSE	'	'	'	'
Deposits	1,256	1,518	3,762	4,740
Federal funds purchased and securities sold under agreements to repurchase	19	14	69	36
Other borrowings	1,069	836	2,728	2,709
TOTAL INTEREST EXPENSE	2,344	2,368	6,559	7,485
NET INTEREST INCOME	28,452	27,487	84,716	76,569
Provision for loan and lease losses	1,194	1,879	4,276	7,656
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	27,258	25,608	80,440	68,913
NONINTEREST INCOME	'	'	'	'
Service charges on deposit accounts	2,689	2,838	7,911	8,052
Commissions and fees	1,371	1,139	3,466	3,495
Gains on sales and calls of investment securities	'	'	2	506
Gain on debt extinguishment	'	'	'	1,197
Income on bank owned life insurance	365	383	1,090	1,036
Other income	384	285	784	1,203
TOTAL NONINTEREST INCOME	4,809	4,645	13,253	15,489
NONINTEREST EXPENSE	'	'	'	'
Salaries and employee benefits	11,327	11,019	33,340	31,105
Net occupancy expense	2,017	2,060	6,675	5,921
Furniture and equipment	1,605	1,582	4,958	4,492
Stationery, supplies and postage	368	348	1,056	1,086
Marketing expense	629	715	1,491	1,438
FDIC insurance expense	489	436	1,501	1,505
Legal expense	144	406	636	934
Expenses on other real estate owned and other repossessed assets	50	-2	165	15
Long term debt prepayment fee	'	'	'	526
Merger related expenses	'	744	'	2,827
Core deposit intangible amortization	111	123	353	164
Other expenses	2,945	2,976	8,782	8,014
TOTAL NONINTEREST EXPENSE	19,685	20,407	58,957	58,027
Income before provision for income taxes	12,382	9,846	34,736	26,375
Income tax expense	4,136	3,229	11,546	8,747
NET INCOME	$8,246	$6,617	$23,190	$17,628
PER SHARE OF COMMON STOCK	'	'	'	'
Basic earnings	$0.22	$0.18	$0.61	$0.52
Diluted earnings	$0.22	$0.18	$0.61	$0.52
Dividends	$0.08	$0.07	$0.22	$0.20

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net Income	$8,246	$6,617	$23,190	$17,628
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:	'	'	'	'
Unrealized securities gains (losses) during period	-1,136	1,118	4,649	-5,454
Reclassification for gains included in net income	'	'	-2	-329
Change in pension liability, net	5	5	15	15
Other Comprehensive Income (Loss)	-1,131	1,123	4,662	-5,768
TOTAL COMPREHENSIVE INCOME	$7,115	$7,740	$27,852	$11,860

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands
BALANCE at Dec. 31, 2013	$351,424	$364,637	($8,538)	($4,675)
Net Income	23,190	'	23,190	'
Other comprehensive income, net of tax	4,662	'	'	4,662
Stock based compensation	1,121	1,121	'	'
Stock dividend	'	17,630	-17,630	'
Issuance of stock to dividend reinvestment and stock purchase plan	74	379	-305	'
Exercise of stock options, net of excess tax benefits	52	52	'	'
Cash dividends, common stock	-7,984	'	-7,984	'
BALANCE at Sep. 30, 2014	$372,539	$383,819	($11,267)	($13)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income	$23,190	$17,628
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Net amortization of premiums, discounts and deferred loan fees and costs	2,553	3,695
Depreciation and amortization	2,634	2,606
Amortization of intangible assets	353	164
Provision for loan and lease losses	4,276	7,656
Loans originated for sale	-15,504	-27,125
Proceeds from sales of loans	15,569	29,368
Gains on securities	-2	-506
Gain on early debt extinguishment	'	-1,197
Gains on sales of loans held for sale	-378	-612
Gains on other real estate and other repossessed assets	-143	-277
(Gains) losses on sales of premises and equipment	-50	-68
Stock-based compensation	1,121	669
Deferred tax provision	'	'
(Increase) decrease in other assets	-188	7,837
Increase in other liabilities	790	468
NET CASH PROVIDED BY OPERATING ACTIVITIES	34,221	40,306
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Net cash acquired in acquisition	'	74,316
Proceeds from repayments on and maturity of securities:	'	'
Available for sale	41,704	55,913
Held to maturity	18,064	20,397
Proceeds from sales of securities	'	'
Available for sale	15,646	53,670
Held to maturity	1,374	'
Purchase of securities:	'	'
Available for sale	-65,174	-144,004
Held to maturity	-22,901	-11,768
Net increase in Federal Home Loan Bank Stock	-893	-90
Net increase in loans and leases	-148,397	-47,537
Proceeds from sales of other real estate and repossessed assets	1,098	1,751
Capital expenditures	-1,904	-1,986
Proceeds from sales of bank premises and equipment	102	462
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	-161,281	1,124
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net increase in deposits	67,858	25,739
Increase (decrease) in federal funds purchased and securities sold under agreements to repurchase	30,805	-6,764
Proceeds from other borrowings	135,700	'
Repayments of other borrowings	-75,000	-10,000
Early extinguishment of subordinated debentures	'	-7,803
Excess tax benefits	70	27
Exercise of stock options	86	709
Retirement of restricted stock	-104	'
Issuance of stock to dividend reinvestment and stock purchase plan	74	145
Dividends paid	-7,984	-5,774
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	151,505	-3,721
Net increase in cash and cash equivalents	24,445	37,709
Cash and cash equivalents, beginning of period	102,721	107,545
CASH AND CASH EQUIVALENTS, END OF PERIOD	$127,166	$145,254

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
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 and nine months ended September 30, 2014 do not necessarily indicate the results that the Company will achieve for all of 2014. 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, 2013.
	On May 31, 2013, the Company completed its acquisition of Somerset Hills Bancorp (“Somerset Hills”). For more information, see Note 2 below.
	On May 21, 2014, the Company’s Board of Directors authorized a 5% stock dividend which was distributed on June 17, 2014 to holders of record as of June 3, 2014. 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 the stock dividend.
	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.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	Note 2. 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 $11.43 in cash (adjusted for the 5% stock dividend referred to above), 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 6,083,783 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		1,500
	Total Consideration Paid	$	65,379
	Recognized amounts of identifiable assets and liabilities assumed at fair value
	Cash and cash equivalents	$	80,776
	Securities available for sale		1,777
	Securities held to maturity		8,686
	Federal Home Loan Bank stock		493
	Loans and leases		243,927
	Loans held for sale		2,532
	Premises and equipment		5,214
	Identifiable intangible assets		2,712
	Accrued interest receivable and other assets		9,946
	Deposits		(311,801	)
	Other liabilities		(1,745	)
	Total identifiable assets	$	42,517
	Goodwill	$	22,862
	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)		322			107,333		107,655
	Fair value of acquired loans, including mortgages held for sale	$	1,644		$	244,815	$	246,459
	The core deposit intangible totaled $2.7 million and is being amortized 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.

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Share-Based Compensation	'
	Note 3. Share-Based Compensation
	The Company grants stock options, restricted stock and restricted stock units (RSUs) under the 2009 Equity Compensation Program. Share-based compensation expense of $1,121,000 and $669,000 was recognized for the nine months ended September 30, 2014 and 2013, respectively. As of September 30, 2014, there was unrecognized compensation cost of $851,000 related to unvested restricted stock; that cost is expected to be recognized over a weighted average period of approximately 2.2 years. Unrecognized compensation expense related to unvested stock options was approximately $93,000 as of September 30, 2014 and is expected to be recognized over a period of 2.7 years. Unrecognized compensation expense related to RSUs was approximately $810,000 as of September 30, 2014, and that cost is expected to be recognized over a period of 2.3 years.
	In the first nine months of 2014, the Company granted 1,942 shares of restricted stock at an average grant date fair value of $11.21 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 $4,000 per year for the next five years. In the first nine months of 2013, the Company granted 109,391shares of restricted stock at a grant date fair value of $9.41 per share under the 2009 program. Compensation expense on these shares is expected to average approximately $206,000 per year over a five year period.
	In the first nine months of 2014, the Company granted 127,797 RSUs at a weighted average grant date fair value of $10.65 per share under the Company’s 2009 equity compensation program. These units cliff vest within a range of two to three years. A portion of these RSUs will vest subject to certain performance conditions in the restricted stock unit agreement. There are also certain provisions in the compensation program which state that if a holder of the RSUs reaches a certain age and years of service, the person has effectively earned a portion of the RSUs at that time. Compensation expense on these restricted stock units is expected to average approximately $453,000 per year over a three year period.
	There were no grants of stock options in the first nine months of 2014.
	On May 31, 2013, the Company granted options to purchase 52,500 shares to two new non-employee directors of the Company at an exercise price of $9.44 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	$	3.31
	Option activity under the Company’s stock option plans is as follows:
		Number			Weighted		Weighted		Aggregate
		of shares			average		average		intrinsic value
					exercise		remaining
					price		contractual
							term
							( in years)
	Outstanding, January 1, 2014		514,626		$	10.67			$	754,938
	Issued		—			—
	Exercised		(11,420	)		7.51
	Forfeited		(2,486	)		12.57
	Expired		(68,015	)		11.95
	Outstanding, September 30, 2014		432,705		$	10.54		3.24	$	296,664
	Options exercisable at September 30, 2014		401,205		$	10.62		2.82	$	286,221
	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 2014 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, 2014 and 2013 was $42,000 and $391,000, respectively. Exercise of stock options during the first nine months of 2014 and 2013 resulted in cash receipts of $86,000 and $709,000, respectively.
	Information regarding the Company’s restricted stock (all unvested) and changes during the nine months ended September 30, 2014 is as follows:
		Number of			Weighted
		shares			average
					price
	Outstanding, January 1, 2014		262,270		$	9.12
	Granted		1,942			11.21
	Vested		(99,528	)		9.01
	Forfeited		(2,998	)		9.72
	Outstanding, September 30, 2014		161,686		$	9.21
	Information regarding the Company’s RSUs (all unvested) and changes during the nine months ended September 30, 2014 is as follows:
		Number of			Weighted
		shares			average
					price
	Outstanding, January 1, 2014		—		$	—
	Granted		127,797			10.65
	Vested		(27,248	)		10.66
	Forfeited		(121	)		10.66
	Outstanding, September 30, 2014		100,428		$	10.64

Comprehensive_Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Comprehensive Income	'
	Note 4. Comprehensive Income
	The components of other comprehensive income are as follows:
			September 30, 2014									September 30, 2013
			Before			Tax Benefit			Net of			Before			Tax Benefit			Net of
	For the quarter ended:		tax amount			(Expense)			tax amount			tax amount			(Expense)			tax amount
			(in thousands)									(in thousands)
	Net unrealized gains (losses) on available for sale securities
	Net unrealized holding gains (losses) arising during period			($1,787	)	$	651			($1,136	)	$	1,765			($647	)	$	1,118
	Reclassification adjustment for net gains arising during the period			—			—			—			—			—			—
	Net unrealized gains (losses)			($1,787	)	$	651			($1,136	)	$	1,765			($647	)	$	1,118
	Change in minimum pension liability			7			(2	)		5			8			(3	)		5
	Other comprehensive income (loss), net			($1,780	)	$	649			($1,131	)	$	1,773			($650	)	$	1,123
			Before			Tax Benefit			Net of			Before			Tax Benefit			Net of
	For the nine months ended:		tax amount			(Expense)			tax amount			tax amount			(Expense)			tax amount
			(in thousands)									(in thousands)
	Net unrealized gains (losses) on available for sale securities
	Net unrealized holding gains (losses) arising during period		$	7,253			($2,604	)	$	4,649			($8,635	)	$	3,181			($5,454	)
	Reclassification adjustment for net gains arising during the period			(3	)		1			(2	)		(506	)		177			(329	)
	Net unrealized gains (losses)		$	7,250			($2,603	)	$	4,647			($9,141	)	$	3,358			($5,783	)
	Change in minimum pension liability			23			(8	)		15			23			(8	)		15
	Other comprehensive income (loss), net		$	7,273			($2,611	)	$	4,662			($9,118	)	$	3,350			($5,768	)
	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, 2014									September 30, 2013
			Unrealized			Pension Items			Total			Unrealized			Pension Items			Total
			Gains and									Gains and
			Losses on									Losses on
			Available-									Available-
			for-sale									for-sale
			Securities									Securities
	Beginning Balance		$	1,136			($18	)	$	1,118			($2,348	)		($607	)		($2,955	)
			(in thousands)
	Other comprehensive income (loss) before classifications			(1,136	)		5			(1,131	)		1,118			5			1,123
	Amounts reclassified from accumulated other comprehensive income			—			—			—			—			—			—
	Net current period other comprehensive income (loss)			(1,136	)		5			(1,131	)		1,118			5			1,123
	Ending balance		$	0			($13	)		($13	)		($1,230	)		($602	)		($1,832	)
	(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, 2014									September 30, 2013
			Unrealized			Pension Items			Total			Unrealized			Pension Items			Total
			Gains and									Gains and
			Losses on									Losses on
			Available-									Available-
			for-sale									for-sale
			Securities									Securities
	Beginning Balance			($4,647	)		($28	)		($4,675	)	$	4,553			($617	)	$	3,936
			(in thousands)
	Other comprehensive income (loss) before classifications			4,649			15			4,664			(5,454	)		15			(5,439	)
	Amounts reclassified from accumulated other comprehensive income			(2	)		—			(2	)		(329	)		—			(329	)
	Net current period other comprehensive income (loss)			4,647			15			4,662			(5,783	)		15			(5,768	)
	Ending balance		$	0			($13	)		($13	)		($1,230	)		($602	)		($1,832	)
	(a)	All amounts are net of tax.

Statement_of_Cash_Flow_Informa

Statement of Cash Flow Information, Supplemental Information	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Statement of Cash Flow Information, Supplemental Information	'
	Note 5. Statement of Cash Flow Information, Supplemental Information
		For the Nine Months Ended
		September 30,
		2014		2013
		(in thousands)
	Supplemental schedule of noncash investing and financing activities:
	Cash paid during the period for income taxes	$	10,824	$	8,497
	Cash paid during the period for interest		6,492		7,750
	Transfer of loans and leases into other repossessed assets and other real estate owned		1,417		3,098
	Acquisition of Somerset Hills Bancorp:
	Non-cash assets acquired:
	Investment securities available for sale		—		1,777
	Investment securities held for maturity		—		8,686
	Loans, including loans held for sale		—		246,459
	Goodwill and other intangible assets, net		—		25,574
	Other assets		—		15,653
	Total non-cash assets acquired		—		298,149
	Liabilities assumed:
	Deposits		—		311,801
	Other liabilities		—		1,745
	Total liabilities assumed		—		313,546
	Common stock issued and fair value of stock options converted to Lakeland Bancorp stock options		—		58,919

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Note 6. 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)		2014		2013		2014		2013
	Net income available to common shareholders		$	8,246	$	6,617	$	23,190	$	17,628
	Less: earnings allocated to participating securities			65		48		162		125
	Net income allocated to common shareholders		$	8,181	$	6,569	$	23,028	$	17,503
	Weighted average number of common shares outstanding - basic (1)			37,764		37,288		37,741		33,834
	Share-based plans (1)			113		235		109		138
	Weighted average number of common shares - diluted (1)			37,877		37,523		37,850		33,972
	Basic earnings per share		$	0.22	$	0.18	$	0.61	$	0.52
	Diluted earnings per share		$	0.22	$	0.18	$	0.61	$	0.52
	-1	Adjusted for 5% stock dividend distributed June 17, 2014 to shareholders of record on June 3, 2014
	Options to purchase 288,850 shares of common stock at a weighted average price of $11.88 per share were outstanding and were not included in the computations of diluted earnings per share for the three months and for the nine months ended September 30, 2014 because the exercise price was greater than the average market price.
	Options to purchase 484,434 shares of common stock at a weighted average price of $11.82 were outstanding and were not included in the computations of diluted earnings per share for the three months ended September 30, 2013 because the exercise price was greater than the average market price. Options to purchase 514,822 shares of common stock at a weighted average price of $11.70 were outstanding and were not included in the computations of diluted earnings per share for the nine months ended September 30, 2013 because the exercise price was greater than the average market price.

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investment Securities	'
	Note 7. Investment Securities
	AVAILABLE FOR SALE		September 30, 2014											December 31, 2013
						Gross			Gross							Gross		Gross
			Amortized			Unrealized			Unrealized			Fair		Amortized		Unrealized		Unrealized			Fair
			Cost			Gains			Losses			Value		Cost		Gains		Losses			Value
			(in thousands)											(in thousands)
	U.S. treasury and
	U.S. government agencies		$	84,439		$	103		$	(1,363	)	$	83,179	$	72,828	$	—	$	(2,663	)	$	70,165
	Mortgage-backed securities, residential			309,188			2,505			(3,139	)		308,554		310,088		1,752		(7,338	)		304,502
	Mortgage-backed securities, multifamily			4,972			—			(91	)		4,881		—		—		—			—
	Obligations of states and political subdivisions			29,117			966			(140	)		29,943		36,482		914		(523	)		36,873
	Other debt securities			492			14			—			506		3,541		37		(158	)		3,420
	Equity securities			16,100			1,367			(238	)		17,229		15,433		1,097		(384	)		16,146
			$	444,308		$	4,955		$	(4,971	)	$	444,292	$	438,372	$	3,800	$	(11,066	)	$	431,106
	HELD TO MATURITY		30-Sep-14											31-Dec-13
						Gross			Gross							Gross		Gross
			Amortized			Unrealized			Unrealized			Fair		Amortized		Unrealized		Unrealized			Fair
			Cost			Gains			Losses			Value		Cost		Gains		Losses			Value
			(in thousands)											(in thousands)
	U.S. government agencies		$	14,652		$	108		$	(179	)	$	14,581	$	19,732	$	3	$	(576	)	$	19,159
	Mortgage-backed securities, residential			42,352			550			(804	)		42,098		34,596		524		(1,025	)		34,095
	Mortgage-backed securities, multifamily			2,283			—			(100	)		2,183		2,355		—		(166	)		2,189
	Obligations of states and political subdivisions			44,089			659			(158	)		44,590		43,521		495		(770	)		43,246
	Other debt securities			1,533			142			—			1,675		1,540		165		—			1,705
			$	104,909		$	1,459		$	(1,241	)	$	105,127	$	101,744	$	1,187	$	(2,537	)	$	100,394
	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, 2014
			Available for Sale						Held to Maturity
			Amortized			Fair			Amortized			Fair
			Cost			Value			Cost			Value
	Due in one year or less		$	1,103		$	1,114		$	9,939		$	9,996
	Due after one year through five years			67,615			67,352			14,472			14,830
	Due after five years through ten years			44,508			44,353			29,192			29,361
	Due after ten years			822			809			6,671			6,659
				114,048			113,628			60,274			60,846
	Mortgage-backed securities			314,160			313,435			44,635			44,281
	Equity securities			16,100			17,229			—			—
	Total securities		$	444,308		$	444,292		$	104,909		$	105,127
	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 Nine Months Ended
			September 30,
			2014			2013
	Sale proceeds		$	17,020		$	53,670
	Gross gains			346			509
	Gross losses			(344	)		(3	)
	The above sales in 2014 include sales of $1.4 million in held to maturity mortgage-backed securities of which the Company had already collected over 90% of the principal outstanding. The Company realized $73,000 in gains on sales of these securities. There were no sales of securities in the third quarter of 2014 or 2013.
	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 $365.7 million and $324.5 million at September 30, 2014 and December 31, 2013, 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, 2014 and December 31, 2013:
	September 30, 2014		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		$	14,773		$	63		$	50,722		$	1,300		15	$	65,495	$	1,363
	Mortgage-backed securities, residential			84,495			519			76,292			2,620		43		160,787		3,139
	Mortgage-backed securities, multifamily			4,881			91			—			—		1		4,881		91
	Obligations of states and political subdivisions			1,064			3			5,546			137		12		6,610		140
	Equity securities			5,862			13			4,763			225		4		10,625		238
			$	111,075		$	689		$	137,323		$	4,282		75	$	248,398	$	4,971
	HELD TO MATURITY
	U.S. government agencies		$	—		$	—		$	5,675		$	179		1	$	5,675	$	179
	Mortgage-backed securities, residential			12,177			150			17,970			654		10		30,147		804
	Mortgage-backed securities, multifamily			—			—			2,183			100		2		2,183		100
Obligations of states and political subdivisions			1,031			3			6,007			155		16		7,038		158
		$	13,208		$	153		$	31,835		$	1,088		29	$	45,043	$	1,241
December 31, 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. government agencies		$	70,165		$	2,663		$	—		$	—		16	$	70,165	$	2,663
Mortgage-backed securities, residential			177,262			6,730			10,724			608		51		187,986		7,338
Obligations of states and political subdivisions			8,500			328			2,087			195		21		10,587		523
Other debt securities			—			—			805			158		1		805		158
Equity securities			—			—			10,215			384		3		10,215		384
		$	255,927		$	9,721		$	23,831		$	1,345		92	$	279,758	$	11,066
HELD TO MATURITY
U.S. government agencies		$	14,153		$	576		$	—		$	—		5	$	14,153	$	576
Mortgage-backed securities, residential			22,939			889			1,097			136		11		24,036		1,025
Mortgage-backed securities, multifamily			895			99			1,294			67		2		2,189		166
Obligations of states and political subdivisions			17,826			607			1,456			163		51		19,282		770
		$	55,813		$	2,171		$	3,847		$	366		69	$	59,660	$	2,537
Management has evaluated the securities in the above table and has concluded that none of the securities are other-than-temporarily impaired. The primary cause of the fair values being below cost is due to interest rate movements and is deemed temporary. All investment securities are evaluated on a periodic basis to identify any factors that would require a 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 an additional analysis is required, management will perform and consider the results of a discounted cash flow analysis.
As of September 30, 2014, the equity securities include investments in other financial institutions for market appreciation purposes. Those equities had a purchase price of $2.6 million and a market value of $4.0 million as of September 30, 2014.
As of September 30, 2014, equity securities also included $13.3 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, 2014, the net amortized cost equaled the market value of the investment. There are no unfunded commitments related to this investment.
The funds also include $10.4 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, 2014, the amortized cost of these securities was $10.6 million and the fair value was $10.4 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_Leases_and_Other_Real_Es

Loans, Leases and Other Real Estate	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Loans, Leases and Other Real Estate	'
	Note 8. Loans, Leases and Other Real Estate.
	The following sets forth the composition of Lakeland’s loan and lease portfolio as of September 30, 2014 and December 31, 2013:
			September 30,			December 31,
			2014			2013
			(in thousands)
	Commercial, secured by real estate		$	1,489,219		$	1,389,861
	Commercial, industrial and other			231,961			213,808
	Leases			52,285			41,332
	Real estate-residential mortgage			431,477			432,831
	Real estate-construction			67,949			53,119
	Home equity and consumer			340,513			339,338
	Total loans			2,613,404			2,470,289
	Less: deferred fees			(1,639	)		(1,273	)
	Loans, net of deferred fees		$	2,611,765		$	2,469,016
	At September 30, 2014 and December 31, 2013, home equity and consumer loans included overdraft deposit balances of $652,000 and $590,000, respectively. At September 30, 2014 and December 31, 2013, the Company had $348.6 million and $263.1 million in residential loans pledged for potential borrowings at the Federal Home Loan Bank of New York (FHLB).
	Purchased Credit-Impaired (“PCI”) loans, are loans acquired at a discount that is due, in part, to credit quality. In conjunction with the Somerset Hills acquisition, three loans totaling $1.6 million were deemed to be PCI loans at May 31, 2013 (the “acquisition date”). PCI loans are accounted for in accordance with ASC Subtopic 310-30 and are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance (i.e., allowance for loan losses). For more information, see Note 2 – Acquisitions.
	Subsequent to the acquisition date, one PCI loan for $149,000 was paid in full in the first quarter of 2014. There was credit deterioration in the remaining two loans. One loan totaling $250,000 was charged off in the third quarter of 2014. The remaining loan at a balance $1.3 million is being evaluated for impairment with the remainder of the Company’s impaired loans.
	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:
	(in thousands)		September 30,			December 31,
			2014			2013
	Commercial, secured by real estate		$	8,361		$	7,697
	Commercial, industrial and other			599			88
	Leases			141			—
	Real estate—residential mortgage			7,221			6,141
	Real estate—construction			188			831
	Home equity and consumer			2,114			2,175
	Total non-accrual loans and leases		$	18,624		$	16,932
	Other real estate and other repossessed assets			982			520
	TOTAL NON-PERFORMING ASSETS		$	19,606		$	17,452
	Troubled debt restructurings, still accruing		$	7,957		$	10,289
	Non-accrual loans included $1.3 million and $2.3 million of troubled debt restructurings as of September 30, 2014 and December 31, 2013, respectively.
	An age analysis of past due loans, segregated by class of loans as of September 30, 2014 and December 31, 2013, is as follows:
																					Recorded
									Greater									Total			Investment greater
			30-59 Days			60-89 Days			Than			Total						Loans			than 89 Days and
	September 30, 2014		Past Due			Past Due			89 Days			Past Due			Current			and Leases			still accruing
			(in thousands)
	Commercial, secured by real estate		$	2,759		$	3,698		$	7,227		$	13,684		$	1,475,535		$	1,489,219		$	—
	Commercial, industrial and other			808			601			523			1,932			230,029			231,961			—
	Leases			133			92			141			366			51,919			52,285			—
	Real estate—residential mortgage			3,184			2,192			6,787			12,163			419,314			431,477			27
	Real estate—construction			—			—			189			189			67,760			67,949			—
	Home equity and consumer			3,191			216			2,375			5,782			334,731			340,513			402
			$	10,075		$	6,799		$	17,242		$	34,116		$	2,579,288		$	2,613,404		$	429
	December 31, 2013
	Commercial, secured by real estate		$	7,355		$	5,438		$	6,059		$	18,852		$	1,371,009		$	1,389,861		$	697
	Commercial, industrial and other			482			159			20			661			213,147			213,808			—
	Leases			77			179			—			256			41,076			41,332			—
	Real estate—residential mortgage			5,792			1,306			5,365			12,463			420,368			432,831			414
	Real estate—construction			—			—			831			831			52,288			53,119			—
	Home equity and consumer			1,776			533			2,884			5,193			334,145			339,338			886
			$	15,482		$	7,615		$	15,159		$	38,256		$	2,432,033		$	2,470,289		$	1,997
	Impaired Loans
	The Company defines impaired loans as all non-accrual commercial real estate, commercial, industrial and other, and commercial real estate construction loans with recorded investments of $500,000 or greater. Impaired loans also includes all loans modified in troubled debt restructurings. Impaired loans as of September 30, 2014, September 30, 2013 and December 31, 2013 are as follows:
						Contractual
			Recorded			Unpaid						Interest			Average
			Investment in			Principal			Specific			Income			Investment in
	September 30, 2014		Impaired loans			Balance			Allowance			Recognized			Impaired loans
			(in thousands)
	Loans without specific allowance:
	Commercial, secured by real estate		$	15,393		$	16,047		$	—		$	318		$	15,899
	Commercial, industrial and other			416			920			—			43			1,446
Real estate-residential mortgage			252			252			—			—			275
Real estate-construction			189			189			—			—			411
Home equity and consumer			—			—			—			—			—
Loans with specific allowance:
Commercial, secured by real estate			3,301			3,771			219			119			3,875
Commercial, industrial and other			149			149			12			5			170
Real estate-residential mortgage			1,211			1,013			171			6			170
Real estate-construction			—			—			—			—			—
Home equity and consumer			1,326			1,326			686			36			1,044
Total:
Commercial, secured by real estate		$	18,694		$	19,818		$	219		$	437		$	19,774
Commercial, industrial and other			565			1,069			12			48			1,616
Real estate—residential mortgage			1,463			1,265			171			6			445
Real estate-construction			189			189			—			—			411
Home equity and consumer			1,326			1,326			686			36			1,044
		$	22,237		$	23,667		$	1,088		$	527		$	23,290
					Contractual
		Recorded			Unpaid						Interest			Average
		Investment in			Principal			Specific			Income			Investment in
September 30, 2013		Impaired loans			Balance			Allowance			Recognized			Impaired loans
		(in thousands)
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
					Contractual
		Recorded			Unpaid						Interest			Average
		Investment in			Principal			Specific			Income			Investment in
December 31, 2013		Impaired loans			Balance			Allowance			Recognized			Impaired loans
		(in thousands)
Loans without specific allowance:
Commercial, secured by real estate		$	8,223		$	9,656		$	—		$	198		$	8,853
Commercial, industrial and other			4,020			4,118			—			189			4,333
Real estate-residential mortgage			617			672			—			—			622
Real estate-construction			501			2,411			—			—			2,111
Home equity and consumer			17			17			—			1			17
Loans with specific allowance:
Commercial, secured by real estate			10,152			10,217			739			442			9,727
Commercial, industrial and other			155			155			31			5			396
Real estate-residential mortgage			—			—			—			—			—
Real estate-construction			—			—			—			—			—
Home equity and consumer			934			936			140			42			907
Total:
Commercial, secured by real estate		$	18,375		$	19,873		$	739		$	640		$	18,580
Commercial, industrial and other			4,175			4,273			31			194			4,729
Real estate—residential mortgage			617			672			—			—			622
Real estate-construction			501			2,411			—			—			2,111
Home equity and consumer			951			953			140			43			924
		$	24,619		$	28,182		$	910		$	877		$	26,966
Interest that would have been accrued on impaired loans during the first nine months of 2014 and 2013 had the loans been performing under original terms would have been $1.3 million and $1.7 million, respectively. Interest that would have accrued for the year ended December 31, 2013 was $2.2 million.
Credit Quality Indicators
The class of loans are determined by internal risk rating. 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 commercial 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, 2014 and December 31, 2013, by the risk ratings discussed above (in thousands):
September 30, 2014		Commercial,			Commercial,			Real estate-
		secured by			industrial			construction
Risk Rating		real estate			and other
1		$	—		$	913		$	—
2			—			10,126			—
3			69,582			27,773			—
4			479,080			83,989			4,600
5			824,573			71,342			60,383
5W - Watch			40,681			15,224			—
6 - Other Assets Especially Mentioned			29,563			11,225			1,239
7 - Substandard			45,740			11,369			1,727
8 - Doubtful			—			—			—
9 - Loss			—			—			—
Total		$	1,489,219		$	231,961		$	67,949
December 31, 2013		Commercial,			Commercial,			Real estate-
		secured by			industrial			construction
Risk Rating		real estate			and other
1		$	—		$	952		$	—
2			—			12,964			—
3			70,811			9,263			—
4			442,933			60,002			1,178
5			754,275			85,939			48,243
5W - Watch			38,893			12,278			—
6 - Other Assets Especially Mentioned			27,640			9,596			1,245
7 - Substandard			55,309			22,814			2,453
8 - Doubtful			—			—			—
9 - Loss			—			—			—
Total		$	1,389,861		$	213,808		$	53,119
The risk rating tables above do not include consumer or residential loans or leases because they are evaluated on their payment status.
Allowance for Loan and Lease Losses
The following table details activity in the allowance for loan and lease losses by portfolio segment for the three months ended September 30, 2014 and 2013:
Three Months Ended September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Beginning Balance		$	14,042		$	3,601		$	654		$	4,231		$	536		$	4,111		$	2,691		$	29,866
Charge-offs			(134	)		(143	)		(229	)		(192	)		—			(675	)		—			(1,373	)
Recoveries			97			215			—			3			8			37			—			360
Provision			(714	)		(678	)		403			97			(36	)		1,465			657			1,194
Ending Balance		$	13,291		$	2,995		$	828		$	4,139		$	508		$	4,938		$	3,348		$	30,047
Three 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		$	18,439		$	5,120		$	399		$	3,121		$	371		$	2,176			29,626
Charge-offs			(378	)		(444	)		(34	)		(152	)		(1,250	)		(561	)		(2,819	)
Recoveries			875			77			12			34			5			68			1,071
Provision			(1,231	)		357			131			182			1,252			1,188			1,879
Ending Balance		$	17,705		$	5,110		$	508		$	3,185		$	378		$	2,871		$	29,757
The following table details activity in the allowance for loan and lease losses by portfolio segment for the nine months ended September 30, 2014 and 2013:
Nine Months Ended September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
Allowance for Loan and Lease Losses:		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Beginning Balance		$	14,463		$	5,331		$	504		$	3,214		$	542		$	2,737		$	3,030		$	29,821
Charge-offs			(1,925	)		(755	)		(394	)		(701	)		(25	)		(1,759	)		—			(5,559	)
Recoveries			451			894			—			12			9			143			—			1,509
Provision			302			(2,475	)		718			1,614			(18	)		3,817			318			4,276
Ending Balance		$	13,291		$	2,995		$	828		$	4,139		$	508		$	4,938		$	3,348		$	30,047
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
Loans receivable summarized by portfolio segment and impairment method are as follows:
At September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Ending Balance: Individually evaluated for impairment		$	18,694		$	565		$	—		$	1,463		$	189		$	1,326		$	22,237
Ending Balance: Collectively evaluated for impairment			1,470,525			231,396			52,285			430,014			67,760			339,187		$	2,591,167
Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—		$	0
Ending Balance (1)		$	1,489,219		$	231,961		$	52,285		$	431,477		$	67,949		$	340,513		$	2,613,404
-1	Excludes deferred fees
At December 31, 2013		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Ending Balance: Individually evaluated for impairment		$	18,375		$	4,175		$	—		$	617		$	501		$	951		$	24,619
Ending Balance: Collectively evaluated for impairment			1,371,486			209,633			41,332			432,214			52,618			337,976		$	2,445,259
Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			411		$	411
Ending Balance(1)		$	1,389,861		$	213,808		$	41,332		$	432,831		$	53,119		$	339,338		$	2,470,289
-1	Excludes deferred fees
The allowance for loan losses is summarized by portfolio segment and impairment classification as follows:
At September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Ending Balance: Individually evaluated for impairment		$	219		$	12		$	—		$	171		$	—		$	686		$	—		$	1,088
Ending Balance: Collectively evaluated for impairment			13,072			2,983			828			3,968			508			4,252			3,348		$	28,959
Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—			—			—
Ending Balance		$	13,291		$	2,995		$	828		$	4,139		$	508		$	4,938		$	3,348		$	30,047
At December 31, 2013		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
		secured by			industrial						residential			construction			equity and
		real estate			and other						mortgage						consumer
		(in thousands)
Ending Balance: Individually evaluated for impairment		$	739		$	31		$	—		$	—		$	—		$	140		$	—		$	910
Ending Balance: Collectively evaluated for impairment			13,724			5,300			504			3,214			542			2,597			3,030		$	28,911
Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—			—			—
Ending Balance		$	14,463		$	5,331		$	504		$	3,214		$	542		$	2,737		$	3,030		$	29,821
Lakeland also maintains a reserve for unfunded lending commitments which are included in other liabilities. This reserve was $1.2 million for each of the periods ended September 30, 2014 and December 31, 2013. 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 table summarizes loans that have been restructured during the three and nine months ended September 30, 2014 and 2013:
		For the Three Months Ended									For the Three Months Ended
		September 30, 2014									September 30, 2013
					Pre-			Post-						Pre-			Post-
					Modification			Modification						Modification			Modification
					Outstanding			Outstanding						Outstanding			Outstanding
		Number of			Recorded			Recorded			Number of			Recorded			Recorded
		Contracts			Investment			Investment			Contracts			Investment			Investment
		(Dollars in thousands)									(Dollars in thousands)
Troubled Debt Restructurings:
Commercial, secured by real estate			—		$	—		$	—			—		$	—		$	—
Commercial, industrial and other			—			—			—			—			—			—
Leases			—			—			—			—			—			—
Real estate—residential mortgage			4			1,211			1,211			—			—			—
Real estate—construction			—			—			—			—			—			—
Home equity and consumer			3			317			317			—			—			—
			7		$	1,528		$	1,528			—		$	—		$	—
		For the Nine Months Ended									For the Nine Months Ended
		30-Sep-14									30-Sep-13
					Pre-			Post-						Pre-			Post-
					Modification			Modification						Modification			Modification
					Outstanding			Outstanding						Outstanding			Outstanding
		Number of			Recorded			Recorded			Number of			Recorded			Recorded
		Contracts			Investment			Investment			Contracts			Investment			Investment
		(Dollars in thousands)									(Dollars in thousands)
Troubled Debt Restructurings:
Commercial, secured by real estate			2		$	1,697		$	1,697			11		$	5,472		$	5,468
Commercial, industrial and other			—			—			—			1			127			125
Leases			—			—			—			—			—			—
Real estate—residential mortgage			4			1,211			1,211			—			—			—
Real estate—construction			—			—			—			—			—			—
Home equity and consumer			6			652			652			1			11			11
			12		$	3,560		$	3,560			13		$	5,610		$	5,604
The following table summarizes as of September 30, 2014 and 2013, loans that were restructured within the last 12 months that have subsequently defaulted:
		For the Nine Months Ended
		September 30, 2014						September 30, 2013
		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			1		$	32			5		$	3,084
Commercial, industrial and other			—			—			—			—
Leases			—			—			—			—
Real estate—residential mortgage			1			179			—			—
Real estate—construction			—			—			—			—
Home equity and consumer			—			—			—			—
			2		$	211			5		$	3,084
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 on individual loans. Losses are recorded as a valuation allowance and charged to earnings. As of September 30, 2014, the Company had $1.5 million in mortgages held for sale compared to $1.2 million as of December 31, 2013.
Other Real Estate and Other Repossessed Assets
At September 30, 2014, the Company had other repossessed assets and other real estate owned of $43,000 and $939,000, respectively. At December 31, 2013, the Company had other repossessed assets and other real estate owned of $54,000 and $466,000, respectively.

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	Note 9. 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,
		2014			2013			2014			2013
		(in thousands)						(in thousands)
	Interest cost	$	24		$	22		$	71		$	67
	Expected return on plan assets		(24	)		(18	)		(72	)		(54	)
	Amortization of unrecognized net actuarial loss		9			21			29			62
	Net periodic benefit expense	$	9		$	25		$	28		$	75

Directors_Retirement_Plan

Directors' Retirement Plan	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Directors' Retirement Plan	'
	Note 10. 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,
		2014		2013		2014		2013
		(in thousands)				(in thousands)
	Service cost	$	6	$	8	$	19	$	22
	Interest cost		10		9		29		27
	Amortization of prior service cost		3		3		10		10
	Amortization of unrecognized net actuarial loss		1		2		1		6
	Net periodic benefit expense	$	20	$	22	$	59	$	65
	The Company made contributions of $65,000 and $75,000 to the plan during the nine month periods ended September 30, 2014 and 2013, respectively. The Company does not expect to make any more contributions for the remainder of 2014.

Estimated_Fair_Value_of_Financ

Estimated Fair Value of Financial Instruments and Fair Value Measurement	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Estimated Fair Value of Financial Instruments and Fair Value Measurement	'
	Note 11. 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.
	The fair values of derivatives are based on valuation models from a third party 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 three months ended September 30, 2014, the Company did not make any transfers between any levels within the fair value hierarchy. 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
		Active Markets		Other		Significant
		for Identical		Observable		Unobservable
		Assets		Inputs		Inputs		Total
	September 30, 2014	(Level 1)		(Level 2)		(Level 3)		Fair Value
				(in thousands)
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	8,241	$	74,938	$	—	$	83,179
	Mortgage backed securities		—		313,435		—		313,435
	Obligations of states and political subdivisions		—		29,943		—		29,943
	Corporate debt securities		—		506		—		506
	Equity securities		3,956		13,273		—		17,229
	Total securities available for sale		12,197		432,095		—		444,292
	Non-hedging interest rate derivatives		—		266		—		266
	Total Assets	$	12,197		432,361		—	$	444,558
	Non-hedging interest rate derivatives	$	—	$	266	$	—	$	266
	Total Liabilities	$	—	$	266	$	—	$	266
	December 31, 2013
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	4,330	$	65,835	$	—	$	70,165
	Mortgage backed securities		—		304,502		—		304,502
	Obligations of states and political subdivisions		—		36,873		—		36,873
	Corporate debt securities		—		3,420		—		3,420
	Equity securities		3,239		12,907		—		16,146
	Total securities available for sale		7,569		423,537		—		431,106
	Non-hedging interest rate derivatives		—		562		—		562
	Total Assets	$	7,569	$	424,099	$	—	$	431,668
	Non-hedging interest rate derivatives	$	—	$	562	$	—	$	562
	Total Liabilities	$	—	$	562	$	—	$	562
	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
		Active Markets		Other		Significant
		for Identical		Observable		Unobservable
		Assets		Inputs		Inputs		Total
	September 30, 2014	(Level 1)		(Level 2)		(Level 3)		Fair Value
		(in thousands)
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	22,237	$	22,237
	Loans held for sale		—		1,519		—		1,519
	Other real estate owned and other repossessed assets		—		—		982		982
	December 31, 2013
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	24,619	$	24,619
	Loans held for sale		—		1,206		—		1,206
	Other real estate owned and other repossessed assets		—		—		520		520
	Impaired loans are evaluated and valued at the time the loan is identified as impaired at the lower of cost or market value of the underlying collateral. 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, 2014 and December 31, 2013 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 $6.0 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, 2014 and December 31, 2013 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 valuation of the Company’s loan portfolio is consistent with accounting guidance but does not fully incorporate the exit price approach.
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 fair value of commitments to extend credit and standby letters of credit are deemed immaterial.
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, 2014 and December 31, 2013:
					Quoted Prices in		Significant
					Active Markets		Other		Significant
					for Identical		Observable		Unobservable
	Carrying		Fair		Assets		Inputs		Inputs
September 30, 2014	Value		Value		(Level 1)		(Level 2)		(Level 3)
	(in thousands)
Financial Instruments—Assets
Investment securities held to maturity	$	104,909	$	105,127	$	—	$	99,116	$	6,011
Federal Home Loan Bank and other membership bank stocks		8,831		8,831				8,831		—
Loans and leases, net		2,581,718		2,583,421				—		2,583,421
Financial Instruments—Liabilities
Certificates of Deposit		281,341		280,856		—		280,856		—
Other borrowings		179,700		182,285		—		182,285		—
Subordinated debentures		41,238		30,929		—		—		30,929
31-Dec-13
Financial Instruments—Assets
Investment securities held to maturity	$	101,744	$	100,394	$	—	$	95,194	$	5,200
Federal Home Loan Bank and other membership bank stocks		7,938		7,938		—		7,938		—
Loans and leases, net		2,439,195		2,432,447		—		—		2,432,447
Financial Instruments—Liabilities
Certificates of Deposit		296,086		296,237		—		296,237		—
Other borrowings		119,000		121,870		—		121,870		—
Subordinated debentures		41,238		27,835		—		—		27,835

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives	'
	Note 12. 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, 2014 and December 31, 2013, Lakeland had $483,000 and $1.5 million, 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, 2014	Notional Amount			Average		Weighted Average			Weighted Average	Fair Value
					Maturity (Years)		Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	17,382			6		3.84	%	1 Mo Libor + 2.21		($266	)
	Customer interest rate swaps		(17,382	)		6		3.84	%	1 Mo Libor + 2.21		266
	December 31, 2013	Notional Amount			Average		Weighted Average			Weighted Average	Fair Value
					Maturity (Years)		Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	17,691			6.7		3.83	%	1 Mo Libor + 2.21		($562	)
	Customer interest rate swaps		(17,691	)		6.7		3.83	%	1 Mo Libor + 2.21	$	562

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Note 13. Goodwill and Intangible Assets
	The Company has recorded goodwill of $110.0 million at September 30, 2014 and December 31, 2013 which includes $22.9 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 $353,000 in core deposit intangible. The estimated future amortization expense for each of the succeeding six years ended December 31 is as follows (dollars in thousands):
	For the year ended:
	2014	$	111
	2015		415
	2016		366
	2017		316
	2018		267
	2019		218

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2014
Accounting Changes and Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	Note 14. Recent Accounting Pronouncements
	In June 2014, the Financial Accounting Standards Board (FASB) issued an accounting standards update regarding share –based payments that requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. This update is effective for interim and annual periods beginning after December 15, 2015. The amendments can be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented and to all new or modified awards thereafter. Early adoption is permitted. The Company has determined that adoption of this update will not have a material impact on its accounting and disclosures.
	In June 2014, the FASB issued an accounting standards update that aligns the accounting for repurchase to maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. This update is effective for the first interim or annual period beginning after December 15, 2014. In addition the disclosure of certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required for annual periods beginning after December 15, 2014, and interim periods after March 15, 2015. Early adoption is prohibited. The Company does not engage in repurchase to maturity transactions, and therefore has determined that the adoption of this update is not expected to have a material impact on the Company’s financial results.
	In January 2014. the Financial Accounting Standards Board (the “FASB”) issued an accounting standards update to clarify when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and the real estate recognized. These amendments clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (a) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure; or (b) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. This update is effective for annual periods and interim periods within those annual periods beginning after December 15, 2014. The adoption of this update is not expected to have a material impact on the Company’s financial statements.
	In July 2013, 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 did not have a material impact on the Company’s financial statements.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [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 and nine months ended September 30, 2014 do not necessarily indicate the results that the Company will achieve for all of 2014. 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, 2013.
	On May 31, 2013, the Company completed its acquisition of Somerset Hills Bancorp (“Somerset Hills”). For more information, see Note 2 below.
	On May 21, 2014, the Company’s Board of Directors authorized a 5% stock dividend which was distributed on June 17, 2014 to holders of record as of June 3, 2014. 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 the stock dividend.
	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.
Purchased Credit Impaired Loans	'
	Purchased Credit-Impaired (“PCI”) loans, are loans acquired at a discount that is due, in part, to credit quality. In conjunction with the Somerset Hills acquisition, three loans totaling $1.6 million were deemed to be PCI loans at May 31, 2013 (the “acquisition date”). PCI loans are accounted for in accordance with ASC Subtopic 310-30 and are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance (i.e., allowance for loan losses). For more information, see Note 2 – Acquisitions.
	Subsequent to the acquisition date, one PCI loan for $149,000 was paid in full in the first quarter of 2014. There was credit deterioration in the remaining two loans. One loan totaling $250,000 was charged off in the third quarter of 2014. The remaining loan at a balance $1.3 million is being evaluated for impairment with the remainder of the Company’s impaired loans.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In June 2014, the Financial Accounting Standards Board (FASB) issued an accounting standards update regarding share –based payments that requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. This update is effective for interim and annual periods beginning after December 15, 2015. The amendments can be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented and to all new or modified awards thereafter. Early adoption is permitted. The Company has determined that adoption of this update will not have a material impact on its accounting and disclosures.
	In June 2014, the FASB issued an accounting standards update that aligns the accounting for repurchase to maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. This update is effective for the first interim or annual period beginning after December 15, 2014. In addition the disclosure of certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required for annual periods beginning after December 15, 2014, and interim periods after March 15, 2015. Early adoption is prohibited. The Company does not engage in repurchase to maturity transactions, and therefore has determined that the adoption of this update is not expected to have a material impact on the Company’s financial results.
	In January 2014. the Financial Accounting Standards Board (the “FASB”) issued an accounting standards update to clarify when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and the real estate recognized. These amendments clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (a) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure; or (b) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. This update is effective for annual periods and interim periods within those annual periods beginning after December 15, 2014. The adoption of this update is not expected to have a material impact on the Company’s financial statements.
	In July 2013, 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 did not have a material impact on the Company’s financial statements.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
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		1,500
	Total Consideration Paid	$	65,379
	Recognized amounts of identifiable assets and liabilities assumed at fair value
	Cash and cash equivalents	$	80,776
	Securities available for sale		1,777
	Securities held to maturity		8,686
	Federal Home Loan Bank stock		493
	Loans and leases		243,927
	Loans held for sale		2,532
	Premises and equipment		5,214
	Identifiable intangible assets		2,712
	Accrued interest receivable and other assets		9,946
	Deposits		(311,801	)
	Other liabilities		(1,745	)
	Total identifiable assets	$	42,517
	Goodwill	$	22,862
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)		322			107,333		107,655
	Fair value of acquired loans, including mortgages held for sale	$	1,644		$	244,815	$	246,459

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based 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	$	3.31
Option Activity under Stock Option Plans	'
	Option activity under the Company’s stock option plans is as follows:
		Number			Weighted		Weighted		Aggregate
		of shares			average		average		intrinsic value
					exercise		remaining
					price		contractual
							term
							( in years)
	Outstanding, January 1, 2014		514,626		$	10.67			$	754,938
	Issued		—			—
	Exercised		(11,420	)		7.51
	Forfeited		(2,486	)		12.57
	Expired		(68,015	)		11.95
	Outstanding, September 30, 2014		432,705		$	10.54		3.24	$	296,664
	Options exercisable at September 30, 2014		401,205		$	10.62		2.82	$	286,221
Summary of Company's Restricted Stock	'
	Information regarding the Company’s restricted stock (all unvested) and changes during the nine months ended September 30, 2014 is as follows:
		Number of			Weighted
		shares			average
					price
	Outstanding, January 1, 2014		262,270		$	9.12
	Granted		1,942			11.21
	Vested		(99,528	)		9.01
	Forfeited		(2,998	)		9.72
	Outstanding, September 30, 2014		161,686		$	9.21
	Information regarding the Company’s RSUs (all unvested) and changes during the nine months ended September 30, 2014 is as follows:
		Number of			Weighted
		shares			average
					price
	Outstanding, January 1, 2014		—		$	—
	Granted		127,797			10.65
	Vested		(27,248	)		10.66
	Forfeited		(121	)		10.66
	Outstanding, September 30, 2014		100,428		$	10.64

Comprehensive_Income_Tables

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Components of Other Comprehensive Income	'
	The components of other comprehensive income are as follows:
			September 30, 2014									September 30, 2013
			Before			Tax Benefit			Net of			Before			Tax Benefit			Net of
	For the quarter ended:		tax amount			(Expense)			tax amount			tax amount			(Expense)			tax amount
			(in thousands)									(in thousands)
	Net unrealized gains (losses) on available for sale securities
	Net unrealized holding gains (losses) arising during period			($1,787	)	$	651			($1,136	)	$	1,765			($647	)	$	1,118
	Reclassification adjustment for net gains arising during the period			—			—			—			—			—			—
	Net unrealized gains (losses)			($1,787	)	$	651			($1,136	)	$	1,765			($647	)	$	1,118
	Change in minimum pension liability			7			(2	)		5			8			(3	)		5
	Other comprehensive income (loss), net			($1,780	)	$	649			($1,131	)	$	1,773			($650	)	$	1,123
			Before			Tax Benefit			Net of			Before			Tax Benefit			Net of
	For the nine months ended:		tax amount			(Expense)			tax amount			tax amount			(Expense)			tax amount
			(in thousands)									(in thousands)
	Net unrealized gains (losses) on available for sale securities
	Net unrealized holding gains (losses) arising during period		$	7,253			($2,604	)	$	4,649			($8,635	)	$	3,181			($5,454	)
	Reclassification adjustment for net gains arising during the period			(3	)		1			(2	)		(506	)		177			(329	)
	Net unrealized gains (losses)		$	7,250			($2,603	)	$	4,647			($9,141	)	$	3,358			($5,783	)
	Change in minimum pension liability			23			(8	)		15			23			(8	)		15
	Other comprehensive income (loss), net		$	7,273			($2,611	)	$	4,662			($9,118	)	$	3,350			($5,768	)
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, 2014									September 30, 2013
			Unrealized			Pension Items			Total			Unrealized			Pension Items			Total
			Gains and									Gains and
			Losses on									Losses on
			Available-									Available-
			for-sale									for-sale
			Securities									Securities
	Beginning Balance		$	1,136			($18	)	$	1,118			($2,348	)		($607	)		($2,955	)
			(in thousands)
	Other comprehensive income (loss) before classifications			(1,136	)		5			(1,131	)		1,118			5			1,123
	Amounts reclassified from accumulated other comprehensive income			—			—			—			—			—			—
	Net current period other comprehensive income (loss)			(1,136	)		5			(1,131	)		1,118			5			1,123
	Ending balance		$	0			($13	)		($13	)		($1,230	)		($602	)		($1,832	)
	(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, 2014									September 30, 2013
			Unrealized			Pension Items			Total			Unrealized			Pension Items			Total
			Gains and									Gains and
			Losses on									Losses on
			Available-									Available-
			for-sale									for-sale
			Securities									Securities
	Beginning Balance			($4,647	)		($28	)		($4,675	)	$	4,553			($617	)	$	3,936
			(in thousands)
	Other comprehensive income (loss) before classifications			4,649			15			4,664			(5,454	)		15			(5,439	)
	Amounts reclassified from accumulated other comprehensive income			(2	)		—			(2	)		(329	)		—			(329	)
	Net current period other comprehensive income (loss)			4,647			15			4,662			(5,783	)		15			(5,768	)
	Ending balance		$	0			($13	)		($13	)		($1,230	)		($602	)		($1,832	)
	(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, 2014
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Schedule of Noncash Investing and Financing Activities	'
		For the Nine Months Ended
		September 30,
		2014		2013
		(in thousands)
	Supplemental schedule of noncash investing and financing activities:
	Cash paid during the period for income taxes	$	10,824	$	8,497
	Cash paid during the period for interest		6,492		7,750
	Transfer of loans and leases into other repossessed assets and other real estate owned		1,417		3,098
	Acquisition of Somerset Hills Bancorp:
	Non-cash assets acquired:
	Investment securities available for sale		—		1,777
	Investment securities held for maturity		—		8,686
	Loans, including loans held for sale		—		246,459
	Goodwill and other intangible assets, net		—		25,574
	Other assets		—		15,653
	Total non-cash assets acquired		—		298,149
	Liabilities assumed:
	Deposits		—		311,801
	Other liabilities		—		1,745
	Total liabilities assumed		—		313,546
	Common stock issued and fair value of stock options converted to Lakeland Bancorp stock options		—		58,919

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
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)		2014		2013		2014		2013
	Net income available to common shareholders		$	8,246	$	6,617	$	23,190	$	17,628
	Less: earnings allocated to participating securities			65		48		162		125
	Net income allocated to common shareholders		$	8,181	$	6,569	$	23,028	$	17,503
	Weighted average number of common shares outstanding - basic (1)			37,764		37,288		37,741		33,834
	Share-based plans (1)			113		235		109		138
	Weighted average number of common shares - diluted (1)			37,877		37,523		37,850		33,972
	Basic earnings per share		$	0.22	$	0.18	$	0.61	$	0.52
	Diluted earnings per share		$	0.22	$	0.18	$	0.61	$	0.52
	-1	Adjusted for 5% stock dividend distributed June 17, 2014 to shareholders of record on June 3, 2014

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Reconciliation of Available-for-Sale Securities	'
	AVAILABLE FOR SALE	September 30, 2014											December 31, 2013
					Gross			Gross							Gross		Gross
		Amortized			Unrealized			Unrealized			Fair		Amortized		Unrealized		Unrealized			Fair
		Cost			Gains			Losses			Value		Cost		Gains		Losses			Value
		(in thousands)											(in thousands)
	U.S. treasury and
	U.S. government agencies	$	84,439		$	103		$	(1,363	)	$	83,179	$	72,828	$	—	$	(2,663	)	$	70,165
	Mortgage-backed securities, residential		309,188			2,505			(3,139	)		308,554		310,088		1,752		(7,338	)		304,502
	Mortgage-backed securities, multifamily		4,972			—			(91	)		4,881		—		—		—			—
	Obligations of states and political subdivisions		29,117			966			(140	)		29,943		36,482		914		(523	)		36,873
	Other debt securities		492			14			—			506		3,541		37		(158	)		3,420
	Equity securities		16,100			1,367			(238	)		17,229		15,433		1,097		(384	)		16,146
		$	444,308		$	4,955		$	(4,971	)	$	444,292	$	438,372	$	3,800	$	(11,066	)	$	431,106
Reconciliation of Held-to-Maturity Securities	'
	HELD TO MATURITY	30-Sep-14											31-Dec-13
					Gross			Gross							Gross		Gross
		Amortized			Unrealized			Unrealized			Fair		Amortized		Unrealized		Unrealized			Fair
		Cost			Gains			Losses			Value		Cost		Gains		Losses			Value
		(in thousands)											(in thousands)
	U.S. government agencies	$	14,652		$	108		$	(179	)	$	14,581	$	19,732	$	3	$	(576	)	$	19,159
	Mortgage-backed securities, residential		42,352			550			(804	)		42,098		34,596		524		(1,025	)		34,095
	Mortgage-backed securities, multifamily		2,283			—			(100	)		2,183		2,355		—		(166	)		2,189
	Obligations of states and political subdivisions		44,089			659			(158	)		44,590		43,521		495		(770	)		43,246
	Other debt securities		1,533			142			—			1,675		1,540		165		—			1,705
		$	104,909		$	1,459		$	(1,241	)	$	105,127	$	101,744	$	1,187	$	(2,537	)	$	100,394
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, 2014
		Available for Sale						Held to Maturity
		Amortized			Fair			Amortized			Fair
		Cost			Value			Cost			Value
	Due in one year or less	$	1,103		$	1,114		$	9,939		$	9,996
	Due after one year through five years		67,615			67,352			14,472			14,830
	Due after five years through ten years		44,508			44,353			29,192			29,361
	Due after ten years		822			809			6,671			6,659
			114,048			113,628			60,274			60,846
	Mortgage-backed securities		314,160			313,435			44,635			44,281
	Equity securities		16,100			17,229			—			—
	Total securities	$	444,308		$	444,292		$	104,909		$	105,127
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 Nine Months Ended
		September 30,
		2014			2013
	Sale proceeds	$	17,020		$	53,670
	Gross gains		346			509
	Gross losses		(344	)		(3	)
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, 2014 and December 31, 2013:
	September 30, 2014	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	$	14,773		$	63		$	50,722		$	1,300		15	$	65,495	$	1,363
	Mortgage-backed securities, residential		84,495			519			76,292			2,620		43		160,787		3,139
	Mortgage-backed securities, multifamily		4,881			91			—			—		1		4,881		91
	Obligations of states and political subdivisions		1,064			3			5,546			137		12		6,610		140
	Equity securities		5,862			13			4,763			225		4		10,625		238
		$	111,075		$	689		$	137,323		$	4,282		75	$	248,398	$	4,971
	HELD TO MATURITY
	U.S. government agencies	$	—		$	—		$	5,675		$	179		1	$	5,675	$	179
	Mortgage-backed securities, residential		12,177			150			17,970			654		10		30,147		804
	Mortgage-backed securities, multifamily		—			—			2,183			100		2		2,183		100
	Obligations of states and political subdivisions		1,031			3			6,007			155		16		7,038		158
		$	13,208		$	153		$	31,835		$	1,088		29	$	45,043	$	1,241
	December 31, 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. government agencies	$	70,165		$	2,663		$	—		$	—		16	$	70,165	$	2,663
	Mortgage-backed securities, residential		177,262			6,730			10,724			608		51		187,986		7,338
	Obligations of states and political subdivisions		8,500			328			2,087			195		21		10,587		523
	Other debt securities		—			—			805			158		1		805		158
	Equity securities		—			—			10,215			384		3		10,215		384
		$	255,927		$	9,721		$	23,831		$	1,345		92	$	279,758	$	11,066
	HELD TO MATURITY
	U.S. government agencies	$	14,153		$	576		$	—		$	—		5	$	14,153	$	576
	Mortgage-backed securities, residential		22,939			889			1,097			136		11		24,036		1,025
	Mortgage-backed securities, multifamily		895			99			1,294			67		2		2,189		166
	Obligations of states and political subdivisions		17,826			607			1,456			163		51		19,282		770
		$	55,813		$	2,171		$	3,847		$	366		69	$	59,660	$	2,537

Loans_Leases_and_Other_Real_Es1

Loans, Leases and Other Real Estate (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [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, 2014 and December 31, 2013:
			September 30,			December 31,
			2014			2013
			(in thousands)
	Commercial, secured by real estate		$	1,489,219		$	1,389,861
	Commercial, industrial and other			231,961			213,808
	Leases			52,285			41,332
	Real estate-residential mortgage			431,477			432,831
	Real estate-construction			67,949			53,119
	Home equity and consumer			340,513			339,338
	Total loans			2,613,404			2,470,289
	Less: deferred fees			(1,639	)		(1,273	)
	Loans, net of deferred fees		$	2,611,765		$	2,469,016
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:
	(in thousands)		September 30,			December 31,
			2014			2013
	Commercial, secured by real estate		$	8,361		$	7,697
	Commercial, industrial and other			599			88
	Leases			141			—
	Real estate—residential mortgage			7,221			6,141
	Real estate—construction			188			831
	Home equity and consumer			2,114			2,175
	Total non-accrual loans and leases		$	18,624		$	16,932
	Other real estate and other repossessed assets			982			520
	TOTAL NON-PERFORMING ASSETS		$	19,606		$	17,452
	Troubled debt restructurings, still accruing		$	7,957		$	10,289
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, 2014 and December 31, 2013, is as follows:
																					Recorded
									Greater									Total			Investment greater
			30-59 Days			60-89 Days			Than			Total						Loans			than 89 Days and
	September 30, 2014		Past Due			Past Due			89 Days			Past Due			Current			and Leases			still accruing
			(in thousands)
	Commercial, secured by real estate		$	2,759		$	3,698		$	7,227		$	13,684		$	1,475,535		$	1,489,219		$	—
	Commercial, industrial and other			808			601			523			1,932			230,029			231,961			—
	Leases			133			92			141			366			51,919			52,285			—
	Real estate—residential mortgage			3,184			2,192			6,787			12,163			419,314			431,477			27
	Real estate—construction			—			—			189			189			67,760			67,949			—
	Home equity and consumer			3,191			216			2,375			5,782			334,731			340,513			402
			$	10,075		$	6,799		$	17,242		$	34,116		$	2,579,288		$	2,613,404		$	429
	December 31, 2013
	Commercial, secured by real estate		$	7,355		$	5,438		$	6,059		$	18,852		$	1,371,009		$	1,389,861		$	697
	Commercial, industrial and other			482			159			20			661			213,147			213,808			—
	Leases			77			179			—			256			41,076			41,332			—
	Real estate—residential mortgage			5,792			1,306			5,365			12,463			420,368			432,831			414
	Real estate—construction			—			—			831			831			52,288			53,119			—
	Home equity and consumer			1,776			533			2,884			5,193			334,145			339,338			886
			$	15,482		$	7,615		$	15,159		$	38,256		$	2,432,033		$	2,470,289		$	1,997
Impaired Loans with and without Specific Allowances	'
	Impaired Loans
	Impaired loans as of September 30, 2014, September 30, 2013 and December 31, 2013 are as follows:
						Contractual
			Recorded			Unpaid						Interest			Average
			Investment in			Principal			Specific			Income			Investment in
	September 30, 2014		Impaired loans			Balance			Allowance			Recognized			Impaired loans
			(in thousands)
	Loans without specific allowance:
	Commercial, secured by real estate		$	15,393		$	16,047		$	—		$	318		$	15,899
	Commercial, industrial and other			416			920			—			43			1,446
	Real estate-residential mortgage			252			252			—			—			275
	Real estate-construction			189			189			—			—			411
	Home equity and consumer			—			—			—			—			—
	Loans with specific allowance:
	Commercial, secured by real estate			3,301			3,771			219			119			3,875
	Commercial, industrial and other			149			149			12			5			170
	Real estate-residential mortgage			1,211			1,013			171			6			170
	Real estate-construction			—			—			—			—			—
	Home equity and consumer			1,326			1,326			686			36			1,044
	Total:
	Commercial, secured by real estate		$	18,694		$	19,818		$	219		$	437		$	19,774
	Commercial, industrial and other			565			1,069			12			48			1,616
	Real estate—residential mortgage			1,463			1,265			171			6			445
	Real estate-construction			189			189			—			—			411
	Home equity and consumer			1,326			1,326			686			36			1,044
			$	22,237		$	23,667		$	1,088		$	527		$	23,290
						Contractual
			Recorded			Unpaid						Interest			Average
			Investment in			Principal			Specific			Income			Investment in
	September 30, 2013		Impaired loans			Balance			Allowance			Recognized			Impaired loans
			(in thousands)
	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
						Contractual
			Recorded			Unpaid						Interest			Average
			Investment in			Principal			Specific			Income			Investment in
	December 31, 2013		Impaired loans			Balance			Allowance			Recognized			Impaired loans
			(in thousands)
	Loans without specific allowance:
	Commercial, secured by real estate		$	8,223		$	9,656		$	—		$	198		$	8,853
	Commercial, industrial and other			4,020			4,118			—			189			4,333
	Real estate-residential mortgage			617			672			—			—			622
	Real estate-construction			501			2,411			—			—			2,111
	Home equity and consumer			17			17			—			1			17
	Loans with specific allowance:
	Commercial, secured by real estate			10,152			10,217			739			442			9,727
Commercial, industrial and other			155			155			31			5			396
Real estate-residential mortgage			—			—			—			—			—
Real estate-construction			—			—			—			—			—
Home equity and consumer			934			936			140			42			907
Total:
Commercial, secured by real estate		$	18,375		$	19,873		$	739		$	640		$	18,580
Commercial, industrial and other			4,175			4,273			31			194			4,729
Real estate—residential mortgage			617			672			—			—			622
Real estate-construction			501			2,411			—			—			2,111
Home equity and consumer			951			953			140			43			924
		$	24,619		$	28,182		$	910		$	877		$	26,966
Company's Commercial Loan Portfolio	'
	The following table shows the Company’s commercial loan portfolio as of September 30, 2014 and December 31, 2013, by the risk ratings discussed above (in thousands):
	September 30, 2014		Commercial,			Commercial,			Real estate-
			secured by			industrial			construction
	Risk Rating		real estate			and other
	1		$	—		$	913		$	—
	2			—			10,126			—
	3			69,582			27,773			—
	4			479,080			83,989			4,600
	5			824,573			71,342			60,383
	5W - Watch			40,681			15,224			—
	6 - Other Assets Especially Mentioned			29,563			11,225			1,239
	7 - Substandard			45,740			11,369			1,727
	8 - Doubtful			—			—			—
	9 - Loss			—			—			—
	Total		$	1,489,219		$	231,961		$	67,949
	December 31, 2013		Commercial,			Commercial,			Real estate-
			secured by			industrial			construction
	Risk Rating		real estate			and other
	1		$	—		$	952		$	—
	2			—			12,964			—
	3			70,811			9,263			—
	4			442,933			60,002			1,178
	5			754,275			85,939			48,243
	5W - Watch			38,893			12,278			—
	6 - Other Assets Especially Mentioned			27,640			9,596			1,245
	7 - Substandard			55,309			22,814			2,453
	8 - Doubtful			—			—			—
	9 - Loss			—			—			—
	Total		$	1,389,861		$	213,808		$	53,119
Allowance for Loan and Lease Losses by Portfolio Segment	'
	The following table details activity in the allowance for loan and lease losses by portfolio segment for the three months ended September 30, 2014 and 2013:
	Three Months Ended September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
			secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Beginning Balance		$	14,042		$	3,601		$	654		$	4,231		$	536		$	4,111		$	2,691		$	29,866
	Charge-offs			(134	)		(143	)		(229	)		(192	)		—			(675	)		—			(1,373	)
	Recoveries			97			215			—			3			8			37			—			360
	Provision			(714	)		(678	)		403			97			(36	)		1,465			657			1,194
	Ending Balance		$	13,291		$	2,995		$	828		$	4,139		$	508		$	4,938		$	3,348		$	30,047
	Three 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		$	18,439		$	5,120		$	399		$	3,121		$	371		$	2,176			29,626
	Charge-offs			(378	)		(444	)		(34	)		(152	)		(1,250	)		(561	)		(2,819	)
	Recoveries			875			77			12			34			5			68			1,071
	Provision			(1,231	)		357			131			182			1,252			1,188			1,879
	Ending Balance		$	17,705		$	5,110		$	508		$	3,185		$	378		$	2,871		$	29,757
	The following table details activity in the allowance for loan and lease losses by portfolio segment for the nine months ended September 30, 2014 and 2013:
	Nine Months Ended September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
	Allowance for Loan and Lease Losses:		secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Beginning Balance		$	14,463		$	5,331		$	504		$	3,214		$	542		$	2,737		$	3,030		$	29,821
	Charge-offs			(1,925	)		(755	)		(394	)		(701	)		(25	)		(1,759	)		—			(5,559	)
	Recoveries			451			894			—			12			9			143			—			1,509
	Provision			302			(2,475	)		718			1,614			(18	)		3,817			318			4,276
	Ending Balance		$	13,291		$	2,995		$	828		$	4,139		$	508		$	4,938		$	3,348		$	30,047
	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
Loans Receivable Summarized by Portfolio Segment and Impairment Method	'
	Loans receivable summarized by portfolio segment and impairment method are as follows:
	At September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
			secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Ending Balance: Individually evaluated for impairment		$	18,694		$	565		$	—		$	1,463		$	189		$	1,326		$	22,237
	Ending Balance: Collectively evaluated for impairment			1,470,525			231,396			52,285			430,014			67,760			339,187		$	2,591,167
	Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—		$	0
	Ending Balance (1)		$	1,489,219		$	231,961		$	52,285		$	431,477		$	67,949		$	340,513		$	2,613,404
	-1	Excludes deferred fees
	At December 31, 2013		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Total
			secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Ending Balance: Individually evaluated for impairment		$	18,375		$	4,175		$	—		$	617		$	501		$	951		$	24,619
	Ending Balance: Collectively evaluated for impairment			1,371,486			209,633			41,332			432,214			52,618			337,976		$	2,445,259
	Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			411		$	411
	Ending Balance(1)		$	1,389,861		$	213,808		$	41,332		$	432,831		$	53,119		$	339,338		$	2,470,289
	-1	Excludes deferred fees
Allowance for Loan Losses Summarized by Portfolio Segment and Impairment Classification	'
	The allowance for loan losses is summarized by portfolio segment and impairment classification as follows:
	At September 30, 2014		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
			secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Ending Balance: Individually evaluated for impairment		$	219		$	12		$	—		$	171		$	—		$	686		$	—		$	1,088
	Ending Balance: Collectively evaluated for impairment			13,072			2,983			828			3,968			508			4,252			3,348		$	28,959
	Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—			—			—
	Ending Balance		$	13,291		$	2,995		$	828		$	4,139		$	508		$	4,938		$	3,348		$	30,047
	At December 31, 2013		Commercial,			Commercial,			Leases			Real estate-			Real estate-			Home			Unallocated			Total
			secured by			industrial						residential			construction			equity and
			real estate			and other						mortgage						consumer
			(in thousands)
	Ending Balance: Individually evaluated for impairment		$	739		$	31		$	—		$	—		$	—		$	140		$	—		$	910
	Ending Balance: Collectively evaluated for impairment			13,724			5,300			504			3,214			542			2,597			3,030		$	28,911
	Ending Balance: Loans acquired with deteriorated credit quality			—			—			—			—			—			—			—			—
	Ending Balance		$	14,463		$	5,331		$	504		$	3,214		$	542		$	2,737		$	3,030		$	29,821
Summary of Restructured Loans	'
	The following table summarizes loans that have been restructured during the three and nine months ended September 30, 2014 and 2013:
			For the Three Months Ended									For the Three Months Ended
			September 30, 2014									September 30, 2013
						Pre-			Post-						Pre-			Post-
						Modification			Modification						Modification			Modification
						Outstanding			Outstanding						Outstanding			Outstanding
			Number of			Recorded			Recorded			Number of			Recorded			Recorded
			Contracts			Investment			Investment			Contracts			Investment			Investment
			(Dollars in thousands)									(Dollars in thousands)
	Troubled Debt Restructurings:
	Commercial, secured by real estate			—		$	—		$	—			—		$	—		$	—
	Commercial, industrial and other			—			—			—			—			—			—
	Leases			—			—			—			—			—			—
	Real estate—residential mortgage			4			1,211			1,211			—			—			—
	Real estate—construction			—			—			—			—			—			—
	Home equity and consumer			3			317			317			—			—			—
				7		$	1,528		$	1,528			—		$	—		$	—
			For the Nine Months Ended									For the Nine Months Ended
			30-Sep-14									30-Sep-13
						Pre-			Post-						Pre-			Post-
						Modification			Modification						Modification			Modification
						Outstanding			Outstanding						Outstanding			Outstanding
			Number of			Recorded			Recorded			Number of			Recorded			Recorded
			Contracts			Investment			Investment			Contracts			Investment			Investment
			(Dollars in thousands)									(Dollars in thousands)
	Troubled Debt Restructurings:
	Commercial, secured by real estate			2		$	1,697		$	1,697			11		$	5,472		$	5,468
	Commercial, industrial and other			—			—			—			1			127			125
	Leases			—			—			—			—			—			—
	Real estate—residential mortgage			4			1,211			1,211			—			—			—
	Real estate—construction			—			—			—			—			—			—
	Home equity and consumer			6			652			652			1			11			11
				12		$	3,560		$	3,560			13		$	5,610		$	5,604
Summary of Restructured Debt within Last 12 Months that have Subsequently Defaulted	'
	The following table summarizes as of September 30, 2014 and 2013, loans that were restructured within the last 12 months that have subsequently defaulted:
			For the Nine Months Ended
			September 30, 2014						September 30, 2013
			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			1		$	32			5		$	3,084
	Commercial, industrial and other			—			—			—			—
	Leases			—			—			—			—
	Real estate—residential mortgage			1			179			—			—
	Real estate—construction			—			—			—			—
	Home equity and consumer			—			—			—			—
				2		$	211			5		$	3,084

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2014
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,
		2014			2013			2014			2013
		(in thousands)						(in thousands)
	Interest cost	$	24		$	22		$	71		$	67
	Expected return on plan assets		(24	)		(18	)		(72	)		(54	)
	Amortization of unrecognized net actuarial loss		9			21			29			62
	Net periodic benefit expense	$	9		$	25		$	28		$	75
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,
		2014			2013			2014			2013
		(in thousands)						(in thousands)
	Service cost	$	6		$	8		$	19		$	22
	Interest cost		10			9			29			27
	Amortization of prior service cost		3			3			10			10
	Amortization of unrecognized net actuarial loss		1			2			1			6
	Net periodic benefit expense	$	20		$	22		$	59		$	65

Estimated_Fair_Value_of_Financ1

Estimated Fair Value of Financial Instruments and Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Financial Assets and Liabilities are Classified	'
	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
		Active Markets		Other		Significant
		for Identical		Observable		Unobservable
		Assets		Inputs		Inputs		Total
	September 30, 2014	(Level 1)		(Level 2)		(Level 3)		Fair Value
				(in thousands)
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	8,241	$	74,938	$	—	$	83,179
	Mortgage backed securities		—		313,435		—		313,435
	Obligations of states and political subdivisions		—		29,943		—		29,943
	Corporate debt securities		—		506		—		506
	Equity securities		3,956		13,273		—		17,229
	Total securities available for sale		12,197		432,095		—		444,292
	Non-hedging interest rate derivatives		—		266		—		266
	Total Assets	$	12,197		432,361		—	$	444,558
	Non-hedging interest rate derivatives	$	—	$	266	$	—	$	266
	Total Liabilities	$	—	$	266	$	—	$	266
	December 31, 2013
	Assets:
	Investment securities, available for sale
	U.S. treasury and government agencies	$	4,330	$	65,835	$	—	$	70,165
	Mortgage backed securities		—		304,502		—		304,502
	Obligations of states and political subdivisions		—		36,873		—		36,873
	Corporate debt securities		—		3,420		—		3,420
	Equity securities		3,239		12,907		—		16,146
	Total securities available for sale		7,569		423,537		—		431,106
	Non-hedging interest rate derivatives		—		562		—		562
	Total Assets	$	7,569	$	424,099	$	—	$	431,668
	Non-hedging interest rate derivatives	$	—	$	562	$	—	$	562
	Total Liabilities	$	—	$	562	$	—	$	562
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
		Active Markets		Other		Significant
		for Identical		Observable		Unobservable
		Assets		Inputs		Inputs		Total
	September 30, 2014	(Level 1)		(Level 2)		(Level 3)		Fair Value
		(in thousands)
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	22,237	$	22,237
	Loans held for sale		—		1,519		—		1,519
	Other real estate owned and other repossessed assets		—		—		982		982
	December 31, 2013
	Assets:
	Impaired Loans and Leases	$	—	$	—	$	24,619	$	24,619
	Loans held for sale		—		1,206		—		1,206
	Other real estate owned and other repossessed assets		—		—		520		520
Carrying Values and 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, 2014 and December 31, 2013:
						Quoted Prices in		Significant
						Active Markets		Other		Significant
						for Identical		Observable		Unobservable
		Carrying		Fair		Assets		Inputs		Inputs
	September 30, 2014	Value		Value		(Level 1)		(Level 2)		(Level 3)
		(in thousands)
	Financial Instruments—Assets
	Investment securities held to maturity	$	104,909	$	105,127	$	—	$	99,116	$	6,011
	Federal Home Loan Bank and other membership bank stocks		8,831		8,831				8,831		—
	Loans and leases, net		2,581,718		2,583,421				—		2,583,421
	Financial Instruments—Liabilities
	Certificates of Deposit		281,341		280,856		—		280,856		—
	Other borrowings		179,700		182,285		—		182,285		—
	Subordinated debentures		41,238		30,929		—		—		30,929
	31-Dec-13
	Financial Instruments—Assets
	Investment securities held to maturity	$	101,744	$	100,394	$	—	$	95,194	$	5,200
	Federal Home Loan Bank and other membership bank stocks		7,938		7,938		—		7,938		—
	Loans and leases, net		2,439,195		2,432,447		—		—		2,432,447
	Financial Instruments—Liabilities
	Certificates of Deposit		296,086		296,237		—		296,237		—
	Other borrowings		119,000		121,870		—		121,870		—
	Subordinated debentures		41,238		27,835		—		—		27,835

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2014
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, 2014	Notional Amount			Average		Weighted Average			Weighted Average	Fair Value
					Maturity (Years)		Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	17,382			6		3.84	%	1 Mo Libor + 2.21		($266	)
	Customer interest rate swaps		(17,382	)		6		3.84	%	1 Mo Libor + 2.21		266
	December 31, 2013	Notional Amount			Average		Weighted Average			Weighted Average	Fair Value
					Maturity (Years)		Rate Fixed			Variable Rate
	3rd party interest rate swaps	$	17,691			6.7		3.83	%	1 Mo Libor + 2.21		($562	)
	Customer interest rate swaps		(17,691	)		6.7		3.83	%	1 Mo Libor + 2.21	$	562

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Estimated Future Amortization Expense	'
	The estimated future amortization expense for each of the succeeding six years ended December 31 is as follows (dollars in thousands):
	For the year ended:
	2014	$	111
	2015		415
	2016		366
	2017		316
	2018		267
	2019		218

Significant_Accounting_Policie2

Significant Accounting Policies - Additional Information (Detail)	0 Months Ended	9 Months Ended
	Jun. 17, 2014	Sep. 30, 2014
Regulatory Assets [Abstract]	'	'
Percentage of common stock dividend distributed	5.00%	5.00%

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended
	Jun. 17, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	31-May-13	Sep. 30, 2014	31-May-13
					Somerset Hills Bancorp [Member]	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	'	'	'	'	'	'	$11.43
Percentage of common stock dividend distributed	5.00%	'	5.00%	'	5.00%	'	'
Percentage of aggregate merger consideration in shares	'	'	'	'	'	'	90.00%
Percentage of aggregate merger consideration in cash	'	'	'	'	'	'	10.00%
Common stock expected to issue	'	'	'	'	6,083,783	'	'
Transaction value	'	'	'	'	$6,460,000	'	'
Allowance for loan and lease losses	'	'	0	'	'	'	'
Core deposit intangible	'	'	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 $)	Sep. 30, 2014	Dec. 31, 2013	31-May-13	31-May-13
In Thousands, unless otherwise specified			Somerset Hills Bancorp [Member]	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	'	'	1,500	'
Total Consideration Paid	'	'	65,379	'
Recognized amounts of identifiable assets and liabilities assumed at fair value	'	'	'	'
Cash and cash equivalents	'	'	'	80,776
Securities available for sale	'	'	'	1,777
Securities held to maturity	'	'	'	8,686
Federal Home Loan Bank stock	'	'	'	493
Loans and leases	'	'	'	243,927
Loans held for sale	'	'	'	2,532
Premises and equipment	'	'	'	5,214
Identifiable intangible assets	'	'	'	2,712
Accrued interest receivable and other assets	'	'	'	9,946
Deposits	'	'	'	-311,801
Other liabilities	'	'	'	-1,745
Total identifiable assets	'	'	'	42,517
Goodwill	$109,974	$109,974	'	$22,862

Acquisitions_Summary_of_Loans_

Acquisitions - Summary of Loans Acquired (Detail) (Somerset Hills Bancorp [Member], USD $)	Sep. 30, 2014
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)	107,655
Fair value of acquired loans, including mortgages held for sale	246,459
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)	322
Fair value of acquired loans, including mortgages held for sale	1,644
Acquired Non-Credit Impaired Loans [Member]	'
Business Acquisition [Line Items]	'
Contractually required principal and interest at acquisition	352,148
Contractual cash flows not expected to be collected (non-accretable difference)	'
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

ShareBased_Compensation_Additi

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

9 Months Ended

0 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

31-May-13

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

2009 Equity Compensation Program [Member]

2009 Equity Compensation Program [Member]

Non-Employee Directors [Member]

Stock Options [Member]

Stock Options [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

RSUs [Member]

RSUs [Member]

Minimum [Member]

Maximum [Member]

Non_Employee_Directors

2009 Equity Compensation Program [Member]

2009 Equity Compensation Program [Member]

2009 Equity Compensation Program [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation expense

$1,121,000

$669,000

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost

'

'

'

'

'

93,000

'

851,000

'

'

'

810,000

'

Weighted average period of expected cost

'

'

'

'

'

'2 years 8 months 12 days

'

'2 years 2 months 12 days

'

'

'

'2 years 2 months 12 days

'

Granted, Number of shares

'

'

'

'

'

'

'

1,942

'

1,942

109,391

127,797

127,797

Granted, Weighted average price

'

'

'

'

'

'

'

$11.21

'

$11.21

$9.41

$10.65

$10.65

Vesting period

'

'

'2 years

'3 years

'

'5 years

'5 years

'

'

'

'

'

'

Share-based compensation expense

'

'

'

'

'

'

'

4,000

206,000

'

'

453,000

'

Stock options granted

'

'

'

'

52,500

0

'

'

'

'

'

'

'

Number of non-employee directors

'

'

'

'

2

'

'

'

'

'

'

'

'

Weighted average exercise price of shares

'

'

'

'

$9.44

'

'

'

'

'

'

'

'

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

42,000

391,000

'

'

'

'

'

'

'

'

'

'

'

Cash receipts due to exercise of stock options

$86,000

$709,000

'

'

'

'

'

'

'

'

'

'

'

ShareBased_Compensation_Summar

Share-Based Compensation - Summary of Weighted Average Assumptions Used to Estimate Options Using Black-Scholes Option Pricing Model (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based 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	$3.31

ShareBased_Compensation_Option

Share-Based Compensation - Option Activity under Stock Option Plans (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Outstanding, Number of shares, Beginning balance	514,626
Issued, Number of shares	'
Exercised, Number of shares	-11,420
Forfeited, Number of shares	-2,486
Expired, Number of shares	-68,015
Outstanding, Number of shares, Ending balance	432,705
Options exercisable, Number of shares, Ending balance	401,205
Outstanding, Weighted average exercise price, Beginning balance	$10.67
Issued, Weighted average exercise price	'
Exercised, Weighted average exercise price	$7.51
Forfeited, Weighted average exercise price	$12.57
Expired, Weighted average exercise price	$11.95
Outstanding, Weighted average exercise price, Ending balance	$10.54
Options exercisable, Weighted average exercise price, Ending balance	$10.62
Outstanding, Weighted average remaining contractual term (in years), Beginning balance	'3 years 2 months 27 days
Options exercisable, Weighted average remaining contractual term (in years), Ending balance	'2 years 9 months 26 days
Outstanding, Aggregate intrinsic value, Beginning balance	$754,938
Outstanding, Aggregate intrinsic value, Ending balance	296,664
Options exercisable, Aggregate intrinsic value, Ending balance	$286,221

ShareBased_Compensation_Summar1

Share-Based Compensation - Summary of Company's Restricted Stock (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Outstanding, Number of shares, Beginning balance	262,270
Granted, Number of shares	1,942
Vested, Number of shares	-99,528
Forfeited, Number of shares	-2,998
Outstanding, Number of shares, Ending balance	161,686
Outstanding, Weighted average price, Beginning balance	$9.12
Granted, Weighted average price	$11.21
Vested, Weighted average price	$9.01
Forfeited, Weighted average price	$9.72
Outstanding, Weighted average price, Ending balance	$9.21
RSUs [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Outstanding, Number of shares, Beginning balance	'
Granted, Number of shares	127,797
Vested, Number of shares	-27,248
Forfeited, Number of shares	-121
Outstanding, Number of shares, Ending balance	100,428
Outstanding, Weighted average price, Beginning balance	'
Granted, Weighted average price	$10.65
Vested, Weighted average price	$10.66
Forfeited, Weighted average price	$10.66
Outstanding, Weighted average price, Ending balance	$10.64

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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net unrealized gains (losses) on available for sale securities	'	'	'	'
Net unrealized holding gains (losses) arising during period, Before tax amount	($1,787)	$1,765	$7,253	($8,635)
Reclassification adjustment for net gains arising during the period, Before tax amount	'	'	-3	-506
Net unrealized gains (losses), Before tax amount	-1,787	1,765	7,250	-9,141
Change in minimum pension liability, Before tax amount	7	8	23	23
Other comprehensive income (loss), net, Before tax amount	-1,780	1,773	7,273	-9,118
Net unrealized holding gains (losses) arising during period, Tax Benefit (Expense)	651	-647	-2,604	3,181
Reclassification adjustment for net gains arising during the period, Tax Benefit (Expense)	'	'	1	177
Net unrealized gains (losses), Tax Benefit (Expense)	651	-647	-2,603	3,358
Change in minimum pension liability, Tax Benefit (Expense)	-2	-3	-8	-8
Other comprehensive income (loss), net, Tax Benefit (Expense)	649	-650	-2,611	3,350
Net unrealized holding gains (losses) arising during period, Net of tax amount	-1,136	1,118	4,649	-5,454
Reclassification adjustment for net gains arising during the period, Net of tax amount	'	'	-2	-329
Net unrealized gains (losses), Net of tax amount	-1,136	1,118	4,647	-5,783
Change in minimum pension liability, Net of tax amount	5	5	15	15
Other Comprehensive Income (Loss)	($1,131)	$1,123	$4,662	($5,768)

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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	$1,118	($2,955)	($4,675)	$3,936
Other comprehensive income (loss) before classifications	-1,131	1,123	4,664	-5,439
Reclassification for gains included in net income	'	'	-2	-329
Other Comprehensive Income (Loss)	-1,131	1,123	4,662	-5,768
Ending balance	-13	-1,832	-13	-1,832
Unrealized Gains and Losses on Available-for-Sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	1,136	-2,348	-4,647	4,553
Other comprehensive income (loss) before classifications	-1,136	1,118	4,649	-5,454
Reclassification for gains included in net income	'	'	-2	-329
Other Comprehensive Income (Loss)	-1,136	1,118	4,647	-5,783
Ending balance	0	-1,230	0	-1,230
Pension Items [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	-18	-607	-28	-617
Other comprehensive income (loss) before classifications	5	5	15	15
Reclassification for gains included in net income	'	'	'	'
Other Comprehensive Income (Loss)	5	5	15	15
Ending balance	($13)	($602)	($13)	($602)

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, 2014	Sep. 30, 2013
Supplemental schedule of noncash investing and financing activities:	'	'
Cash paid during the period for income taxes	$10,824	$8,497
Cash paid during the period for interest	6,492	7,750
Transfer of loans and leases into other repossessed assets and other real estate owned	1,417	3,098
Non-cash assets acquired:	'	'
Investment securities available for sale	'	1,777
Investment securities held for maturity	'	8,686
Loans, including loans held for sale	'	246,459
Goodwill and other intangible assets, net	'	25,574
Other assets	'	15,653
Total non-cash assets acquired	'	298,149
Liabilities assumed:	'	'
Deposits	'	311,801
Other liabilities	'	1,745
Total liabilities assumed	'	313,546
Common stock issued and fair value of stock options converted to Lakeland Bancorp stock options	'	$58,919

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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net income available to common shareholders	$8,246	$6,617	$23,190	$17,628
Less: earnings allocated to participating securities	65	48	162	125
Net income allocated to common shareholders	$8,181	$6,569	$23,028	$17,503
Weighted average number of common shares outstanding - basic	37,764	37,288	37,741	33,834
Share-based plans	113	235	109	138
Weighted average number of common shares - diluted	37,877	37,523	37,850	33,972
Basic earnings per share	$0.22	$0.18	$0.61	$0.52
Diluted earnings per share	$0.22	$0.18	$0.61	$0.52

Earnings_Per_Share_Computation1

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)	0 Months Ended	9 Months Ended
	Jun. 17, 2014	Sep. 30, 2014
Earnings Per Share [Abstract]	'	'
Percentage of common stock dividend distributed	5.00%	5.00%
Common stock dividend, distribution date	'	17-Jun-14
Common stock dividend, record date	'	3-Jun-14

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Weighted average price	'	'	'	'
Common Stock [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Options to purchase	288,850	484,434	288,850	514,822
Weighted average price	$11.88	$11.82	$11.88	$11.70

Investment_Securities_Reconcil

Investment Securities - Reconciliation of Available-for-Sale Securities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$444,308	$438,372
Gross Unrealized Gains	4,955	3,800
Gross Unrealized Losses	-4,971	-11,066
Total securities, Available for Sale, Fair Value	444,292	431,106
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	84,439	72,828
Gross Unrealized Gains	103	'
Gross Unrealized Losses	-1,363	-2,663
Total securities, Available for Sale, Fair Value	83,179	70,165
Mortgage-Backed Securities, Residential [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	309,188	310,088
Gross Unrealized Gains	2,505	1,752
Gross Unrealized Losses	-3,139	-7,338
Total securities, Available for Sale, Fair Value	308,554	304,502
Mortgage-Backed Securities, Multifamily [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	4,972	'
Gross Unrealized Gains	'	'
Gross Unrealized Losses	-91	'
Total securities, Available for Sale, Fair Value	4,881	'
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	29,117	36,482
Gross Unrealized Gains	966	914
Gross Unrealized Losses	-140	-523
Total securities, Available for Sale, Fair Value	29,943	36,873
Other Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	492	3,541
Gross Unrealized Gains	14	37
Gross Unrealized Losses	'	-158
Total securities, Available for Sale, Fair Value	506	3,420
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	16,100	15,433
Gross Unrealized Gains	1,367	1,097
Gross Unrealized Losses	-238	-384
Total securities, Available for Sale, Fair Value	$17,229	$16,146

Investment_Securities_Reconcil1

Investment Securities - Reconciliation of Held-to-Maturity Securities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	$104,909	$101,744
Gross Unrealized Gains	1,459	1,187
Gross Unrealized Losses	-1,241	-2,537
Fair Value	105,127	100,394
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	14,652	19,732
Gross Unrealized Gains	108	3
Gross Unrealized Losses	-179	-576
Fair Value	14,581	19,159
Mortgage-Backed Securities, Residential [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	42,352	34,596
Gross Unrealized Gains	550	524
Gross Unrealized Losses	-804	-1,025
Fair Value	42,098	34,095
Mortgage-Backed Securities, Multifamily [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	2,283	2,355
Gross Unrealized Gains	'	'
Gross Unrealized Losses	-100	-166
Fair Value	2,183	2,189
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	44,089	43,521
Gross Unrealized Gains	659	495
Gross Unrealized Losses	-158	-770
Fair Value	44,590	43,246
Other Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost	1,533	1,540
Gross Unrealized Gains	142	165
Gross Unrealized Losses	'	'
Fair Value	$1,675	$1,705

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, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available for Sale, Amortized Cost	'	'
Due in one year or less	$1,103	'
Due after one year through five years	67,615	'
Due after five years through ten years	44,508	'
Due after ten years	822	'
Total	114,048	'
Total securities, Available for Sale, Amortized Cost	444,308	'
Available for Sale, Fair Value	'	'
Due in one year or less	1,114	'
Due after one year through five years	67,352	'
Due after five years through ten years	44,353	'
Due after ten years	809	'
Total	113,628	'
Total securities, Available for Sale, Fair Value	444,292	431,106
Held to Maturity, Amortized Cost	'	'
Due in one year or less	9,939	'
Due after one year through five years	14,472	'
Due after five years through ten years	29,192	'
Due after ten years	6,671	'
Total	60,274	'
Total securities, Held to Maturity, Amortized Cost	104,909	101,744
Held to Maturity, Fair Value	'	'
Due in one year or less	9,996	'
Due after one year through five years	14,830	'
Due after five years through ten years	29,361	'
Due after ten years	6,659	'
Total	60,846	'
Fair Value	105,127	100,394
Mortgage-Backed Securities, Residential [Member]	'	'
Available for Sale, Amortized Cost	'	'
Available for Sale, Amortized Cost	314,160	'
Available for Sale, Fair Value	'	'
Available for Sale, Fair Value	313,435	'
Total securities, Available for Sale, Fair Value	308,554	304,502
Held to Maturity, Amortized Cost	'	'
Held to Maturity, Amortized Cost	44,635	'
Held to Maturity, Fair Value	'	'
Held to Maturity, Fair Value	44,281	'
Equity Securities [Member]	'	'
Available for Sale, Amortized Cost	'	'
Available for Sale, Amortized Cost	16,100	'
Available for Sale, Fair Value	'	'
Available for Sale, Fair Value	17,229	'
Total securities, Available for Sale, Fair Value	17,229	16,146
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 $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'
Sale proceeds	$17,020	$53,670
Gross gains	346	509
Gross losses	($344)	($3)

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Held to maturity mortgage-backed securities sales	'	'	$1,400,000	'
Mortgage backed securities sales	0	0	'	'
Mortgage backed securities principal paid down	'	'	90.00%	'
Gain on sales of mortgage backed securities	'	'	73,000	'
Securities, carrying value	365,700,000	'	365,700,000	324,500,000
Purchase price of equities	2,600,000	'	2,600,000	'
Market value of equities	4,000,000	'	4,000,000	'
Equity securities included in investment funds	13,300,000	'	13,300,000	'
Investment in community development loans	2,900,000	'	2,900,000	'
Redemption of funds	'	'	'60 days	'
Investment in government guaranteed loans, mortgage-backed securities, small business loans	10,400,000	'	10,400,000	'
Amortized cost of securities	10,600,000	'	10,600,000	'
Fair value of securities	10,400,000	'	10,400,000	'
Unfunded commitments	$0	'	$0	'

Investment_Securities_Reconcil2

Investment Securities - Reconciliation of Available-for-Sale and Held-to-Maturity Securities in Continuous Unrealized Loss Position (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Security	Security
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	$111,075	$255,927
Available for Sale, Less than 12 months, Unrealized Losses	689	9,721
Available for Sale, 12 months or longer, Fair value	137,323	23,831
Available for Sale, 12 months or longer, Unrealized Losses	4,282	1,345
Available for Sale, Number of securities	75	92
Available for Sale, Total, Fair value	248,398	279,758
Available for Sale, Total, Unrealized Losses	4,971	11,066
Held to Maturity, Less than 12 months, Fair value	13,208	55,813
Held to Maturity, Less than 12 months, Unrealized Losses	153	2,171
Held to Maturity, 12 months or longer, Fair value	31,835	3,847
Held to Maturity, 12 months or longer, Unrealized Losses	1,088	366
Held to Maturity, Number of securities	29	69
Held to Maturity, Total, Fair value	45,043	59,660
Held to Maturity, Total, Unrealized Losses	1,241	2,537
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	14,773	70,165
Available for Sale, Less than 12 months, Unrealized Losses	63	2,663
Available for Sale, 12 months or longer, Fair value	50,722	'
Available for Sale, 12 months or longer, Unrealized Losses	1,300	'
Available for Sale, Number of securities	15	16
Available for Sale, Total, Fair value	65,495	70,165
Available for Sale, Total, Unrealized Losses	1,363	2,663
Held to Maturity, Less than 12 months, Fair value	'	14,153
Held to Maturity, Less than 12 months, Unrealized Losses	'	576
Held to Maturity, 12 months or longer, Fair value	5,675	'
Held to Maturity, 12 months or longer, Unrealized Losses	179	'
Held to Maturity, Number of securities	1	5
Held to Maturity, Total, Fair value	5,675	14,153
Held to Maturity, Total, Unrealized Losses	179	576
Mortgage-Backed Securities, Residential [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	84,495	177,262
Available for Sale, Less than 12 months, Unrealized Losses	519	6,730
Available for Sale, 12 months or longer, Fair value	76,292	10,724
Available for Sale, 12 months or longer, Unrealized Losses	2,620	608
Available for Sale, Number of securities	43	51
Available for Sale, Total, Fair value	160,787	187,986
Available for Sale, Total, Unrealized Losses	3,139	7,338
Held to Maturity, Less than 12 months, Fair value	12,177	22,939
Held to Maturity, Less than 12 months, Unrealized Losses	150	889
Held to Maturity, 12 months or longer, Fair value	17,970	1,097
Held to Maturity, 12 months or longer, Unrealized Losses	654	136
Held to Maturity, Number of securities	10	11
Held to Maturity, Total, Fair value	30,147	24,036
Held to Maturity, Total, Unrealized Losses	804	1,025
Mortgage-Backed Securities, Multifamily [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	4,881	'
Available for Sale, Less than 12 months, Unrealized Losses	91	'
Available for Sale, Number of securities	1	'
Available for Sale, Total, Fair value	4,881	'
Available for Sale, Total, Unrealized Losses	91	'
Held to Maturity, Less than 12 months, Fair value	'	895
Held to Maturity, Less than 12 months, Unrealized Losses	'	99
Held to Maturity, 12 months or longer, Fair value	2,183	1,294
Held to Maturity, 12 months or longer, Unrealized Losses	100	67
Held to Maturity, Number of securities	2	2
Held to Maturity, Total, Fair value	2,183	2,189
Held to Maturity, Total, Unrealized Losses	100	166
Obligations of States and Political Subdivisions [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	1,064	8,500
Available for Sale, Less than 12 months, Unrealized Losses	3	328
Available for Sale, 12 months or longer, Fair value	5,546	2,087
Available for Sale, 12 months or longer, Unrealized Losses	137	195
Available for Sale, Number of securities	12	21
Available for Sale, Total, Fair value	6,610	10,587
Available for Sale, Total, Unrealized Losses	140	523
Held to Maturity, Less than 12 months, Fair value	1,031	17,826
Held to Maturity, Less than 12 months, Unrealized Losses	3	607
Held to Maturity, 12 months or longer, Fair value	6,007	1,456
Held to Maturity, 12 months or longer, Unrealized Losses	155	163
Held to Maturity, Number of securities	16	51
Held to Maturity, Total, Fair value	7,038	19,282
Held to Maturity, Total, Unrealized Losses	158	770
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	'	805
Available for Sale, 12 months or longer, Unrealized Losses	'	158
Available for Sale, Number of securities	'	1
Available for Sale, Total, Fair value	'	805
Available for Sale, Total, Unrealized Losses	'	158
Equity Securities [Member]	'	'
Investment [Line Items]	'	'
Available for Sale, Less than 12 months, Fair value	5,862	'
Available for Sale, Less than 12 months, Unrealized Losses	13	'
Available for Sale, 12 months or longer, Fair value	4,763	10,215
Available for Sale, 12 months or longer, Unrealized Losses	225	384
Available for Sale, Number of securities	4	3
Available for Sale, Total, Fair value	10,625	10,215
Available for Sale, Total, Unrealized Losses	$238	$384

Loans_Leases_and_Other_Real_Es2

Loans, Leases and Other Real Estate - Composition of Lakeland`s Loan and Lease Portfolio (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	$2,613,404	$2,470,289
Less: deferred fees	-1,639	-1,273
Loans, net of deferred fees	2,611,765	2,469,016
Commercial, Secured by Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,489,219	1,389,861
Commercial, Industrial and Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	231,961	213,808
Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	52,285	41,332
Real Estate-Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	431,477	432,831
Real Estate-Construction [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	67,949	53,119
Home Equity and Consumer [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	$340,513	$339,338

Loans_Leases_and_Other_Real_Es3

Loans, Leases and Other Real Estate - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

31-May-13

31-May-13

Sep. 30, 2014

Dec. 31, 2013

Purchased Credit-Impaired Loans [Member]

Purchased Credit-Impaired Loans [Member]

Purchased Credit-Impaired Loans [Member]

Minimum [Member]

Somerset Hills Bancorp [Member]

Somerset Hills Bancorp [Member]

Home Equity and Consumer [Member]

Home Equity and Consumer [Member]

SecurityLoan

Purchased Credit-Impaired Loans [Member]

Purchased Credit-Impaired Loans [Member]

SecurityLoan

Accounts, Notes, Loans and Financing Receivable [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Overdraft balances included in home equity and consumer loans

'

'

'

'

'

'

'

'

'

'

'

$652,000

$590,000

Residential loans pledged for potential borrowings at the Federal Home Loan Bank of New York

348,600,000

'

348,600,000

'

263,100,000

'

'

'

'

'

'

'

'

Loan amount deemed to be impaired

'

'

'

'

'

'

'

'

'

'

1,600,000

'

'

Number of Loans

'

'

'

'

'

'

'

2

'

3

'

'

'

Credit deterioration amount in impaired loans

'

'

'

'

'

'

'

1,300,000

'

'

'

'

'

Loans charged off

1,373,000

2,819,000

5,559,000

8,308,000

'

250,000

'

'

'

'

'

'

'

Remaining loan amount paid

'

'

'

'

'

'

149,000

'

'

'

'

'

'

Non-accrual loans included of troubled debt restructurings

1,300,000

'

1,300,000

'

2,300,000

'

'

'

'

'

'

'

'

Group of impaired loans with recorded investment

'

'

'

'

'

'

'

'

500,000

'

'

'

'

Interest accrued on impaired loans and leases

'

'

1,300,000

1,700,000

2,200,000

'

'

'

'

'

'

'

'

Unfunded lending reserve

1,200,000

'

1,200,000

'

1,200,000

'

'

'

'

'

'

'

'

Mortgages held for sale

1,500,000

'

1,500,000

'

1,200,000

'

'

'

'

'

'

'

'

Other repossessed assets owned

43,000

'

43,000

'

54,000

'

'

'

'

'

'

'

'

Other real estate owned

$939,000

'

$939,000

'

$466,000

'

'

'

'

'

'

'

'

Loans_Leases_and_Other_Real_Es4

Loans, Leases and Other Real Estate - Company's Non-Performing Assets and its Accruing Troubled Debt Restructurings (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	$18,624	$16,932
Other real estate and other repossessed assets	982	520
TOTAL NON-PERFORMING ASSETS	19,606	17,452
Troubled debt restructurings, still accruing	7,957	10,289
Commercial, Secured by Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	8,361	7,697
Commercial, Industrial and Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	599	88
Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	141	'
Real Estate-Residential Mortgage [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	7,221	6,141
Real Estate-Construction [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	188	831
Home Equity and Consumer [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total non-accrual loans and leases	$2,114	$2,175

Loans_Leases_and_Other_Real_Es5

Loans, Leases and Other Real Estate - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	$10,075	$15,482
60-89 Days Past Due	6,799	7,615
Greater Than 89 Days	17,242	15,159
Total Past Due	34,116	38,256
Current	2,579,288	2,432,033
Total Loans and Leases	2,613,404	2,470,289
Recorded Investment greater than 89 Days and still accruing	429	1,997
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	2,759	7,355
60-89 Days Past Due	3,698	5,438
Greater Than 89 Days	7,227	6,059
Total Past Due	13,684	18,852
Current	1,475,535	1,371,009
Total Loans and Leases	1,489,219	1,389,861
Recorded Investment greater than 89 Days and still accruing	'	697
Commercial, Industrial and Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	808	482
60-89 Days Past Due	601	159
Greater Than 89 Days	523	20
Total Past Due	1,932	661
Current	230,029	213,147
Total Loans and Leases	231,961	213,808
Recorded Investment greater than 89 Days and still accruing	'	'
Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	133	77
60-89 Days Past Due	92	179
Greater Than 89 Days	141	'
Total Past Due	366	256
Current	51,919	41,076
Total Loans and Leases	52,285	41,332
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	3,184	5,792
60-89 Days Past Due	2,192	1,306
Greater Than 89 Days	6,787	5,365
Total Past Due	12,163	12,463
Current	419,314	420,368
Total Loans and Leases	431,477	432,831
Recorded Investment greater than 89 Days and still accruing	27	414
Real Estate-Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-59 Days Past Due	'	'
60-89 Days Past Due	'	'
Greater Than 89 Days	189	831
Total Past Due	189	831
Current	67,760	52,288
Total Loans and Leases	67,949	53,119
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	3,191	1,776
60-89 Days Past Due	216	533
Greater Than 89 Days	2,375	2,884
Total Past Due	5,782	5,193
Current	334,731	334,145
Total Loans and Leases	340,513	339,338
Recorded Investment greater than 89 Days and still accruing	$402	$886

Loans_Leases_and_Other_Real_Es6

Loans, Leases and Other Real Estate - Impaired Loans with and without Specific Allowances (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	$22,237	$26,061	$24,619
Contractual Unpaid Principal Balance	23,667	29,605	28,182
Specific Allowance	1,088	1,438	910
Interest Income Recognized	527	617	877
Average Investment in Impaired loans	23,290	28,216	26,966
Commercial, Secured by Real Estate [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	18,694	18,867	18,375
Contractual Unpaid Principal Balance	19,818	20,242	19,873
Specific Allowance	219	1,044	739
Interest Income Recognized	437	435	640
Average Investment in Impaired loans	19,774	18,687	18,580
Commercial, Secured by Real Estate [Member] | Loans with Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	3,301	11,769	10,152
Contractual Unpaid Principal Balance	3,771	12,890	10,217
Specific Allowance	219	1,044	739
Interest Income Recognized	119	298	442
Average Investment in Impaired loans	3,875	11,024	9,727
Commercial, Secured by Real Estate [Member] | Loans without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	15,393	7,098	8,223
Contractual Unpaid Principal Balance	16,047	7,352	9,656
Specific Allowance	'	'	'
Interest Income Recognized	318	137	198
Average Investment in Impaired loans	15,899	7,663	8,853
Commercial, Industrial and Other [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	565	4,425	4,175
Contractual Unpaid Principal Balance	1,069	4,500	4,273
Specific Allowance	12	78	31
Interest Income Recognized	48	148	194
Average Investment in Impaired loans	1,616	5,087	4,729
Commercial, Industrial and Other [Member] | Loans with Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	149	388	155
Contractual Unpaid Principal Balance	149	498	155
Specific Allowance	12	78	31
Interest Income Recognized	5	6	5
Average Investment in Impaired loans	170	659	396
Commercial, Industrial and Other [Member] | Loans without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	416	4,037	4,020
Contractual Unpaid Principal Balance	920	4,002	4,118
Specific Allowance	'	'	'
Interest Income Recognized	43	142	189
Average Investment in Impaired loans	1,446	4,428	4,333
Real Estate-Residential Mortgage [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	1,463	479	617
Contractual Unpaid Principal Balance	1,265	479	672
Specific Allowance	171	72	'
Interest Income Recognized	6	'	'
Average Investment in Impaired loans	445	497	622
Real Estate-Residential Mortgage [Member] | Loans with Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	1,211	479	'
Contractual Unpaid Principal Balance	1,013	479	'
Specific Allowance	171	72	'
Interest Income Recognized	6	'	'
Average Investment in Impaired loans	170	497	'
Real Estate-Residential Mortgage [Member] | Loans without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	252	'	617
Contractual Unpaid Principal Balance	252	'	672
Specific Allowance	'	'	'
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	275	'	622
Real Estate-Construction [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	189	921	501
Contractual Unpaid Principal Balance	189	3,015	2,411
Specific Allowance	'	41	'
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	411	2,635	2,111
Real Estate-Construction [Member] | Loans with Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	'	921	'
Contractual Unpaid Principal Balance	'	3,015	'
Specific Allowance	'	41	'
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	'	1,307	'
Real Estate-Construction [Member] | Loans without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	189	'	501
Contractual Unpaid Principal Balance	189	'	2,411
Specific Allowance	'	'	'
Interest Income Recognized	'	'	'
Average Investment in Impaired loans	411	1,328	2,111
Home Equity and Consumer [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	1,326	1,369	951
Contractual Unpaid Principal Balance	1,326	1,369	953
Specific Allowance	686	203	140
Interest Income Recognized	36	34	43
Average Investment in Impaired loans	1,044	1,310	924
Home Equity and Consumer [Member] | Loans with Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	1,326	1,351	934
Contractual Unpaid Principal Balance	1,326	1,351	936
Specific Allowance	686	203	140
Interest Income Recognized	36	33	42
Average Investment in Impaired loans	1,044	1,292	907
Home Equity and Consumer [Member] | Loans without Specific Allowance [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Recorded Investment in Impaired loans	'	18	17
Contractual Unpaid Principal Balance	'	18	17
Specific Allowance	'	'	'
Interest Income Recognized	'	1	1
Average Investment in Impaired loans	'	$18	$17

Loans_Leases_and_Other_Real_Es7

Loans, Leases and Other Real Estate - Company's Commercial Loan Portfolio (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	$1,489,219	$1,389,861
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	69,582	70,811
Commercial, Secured by Real Estate [Member] | Pass 4 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	479,080	442,933
Commercial, Secured by Real Estate [Member] | Pass 5 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	824,573	754,275
Commercial, Secured by Real Estate [Member] | Watch [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	40,681	38,893
Commercial, Secured by Real Estate [Member] | Other Assets Especially Mentioned [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	29,563	27,640
Commercial, Secured by Real Estate [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	45,740	55,309
Commercial, Secured by Real Estate [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	'	'
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	231,961	213,808
Commercial, Industrial and Other [Member] | Pass 1 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	913	952
Commercial, Industrial and Other [Member] | Pass 2 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	10,126	12,964
Commercial, Industrial and Other [Member] | Pass 3 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	27,773	9,263
Commercial, Industrial and Other [Member] | Pass 4 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	83,989	60,002
Commercial, Industrial and Other [Member] | Pass 5 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	71,342	85,939
Commercial, Industrial and Other [Member] | Watch [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	15,224	12,278
Commercial, Industrial and Other [Member] | Other Assets Especially Mentioned [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	11,225	9,596
Commercial, Industrial and Other [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	11,369	22,814
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	67,949	53,119
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	4,600	1,178
Real Estate-Construction [Member] | Pass 5 [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	60,383	48,243
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	1,239	1,245
Real Estate-Construction [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Commercial loan portfolio	1,727	2,453
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_Leases_and_Other_Real_Es8

Loans, Leases and Other Real Estate - Allowance for Loan and Lease Losses by Portfolio Segment (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	$29,866	$29,626	$29,821	$28,931
Charge-offs	-1,373	-2,819	-5,559	-8,308
Recoveries	360	1,071	1,509	1,478
Provision	1,194	1,879	4,276	7,656
Ending Balance	30,047	29,757	30,047	29,757
Commercial, Secured by Real Estate [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	14,042	18,439	14,463	16,258
Charge-offs	-134	-378	-1,925	-1,192
Recoveries	97	875	451	955
Provision	-714	-1,231	302	1,684
Ending Balance	13,291	17,705	13,291	17,705
Commercial, Industrial and Other [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	3,601	5,120	5,331	5,103
Charge-offs	-143	-444	-755	-1,103
Recoveries	215	77	894	139
Provision	-678	357	-2,475	971
Ending Balance	2,995	5,110	2,995	5,110
Leases [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	654	399	504	578
Charge-offs	-229	-34	-394	-206
Recoveries	'	12	'	119
Provision	403	131	718	17
Ending Balance	828	508	828	508
Real Estate-Residential Mortgage [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	4,231	3,121	3,214	3,568
Charge-offs	-192	-152	-701	-903
Recoveries	3	34	12	97
Provision	97	182	1,614	423
Ending Balance	4,139	3,185	4,139	3,185
Real Estate-Construction [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	536	371	542	587
Charge-offs	'	-1,250	-25	-3,652
Recoveries	8	5	9	12
Provision	-36	1,252	-18	3,431
Ending Balance	508	378	508	378
Home Equity and Consumer [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	4,111	2,176	2,737	2,837
Charge-offs	-675	-561	-1,759	-1,252
Recoveries	37	68	143	156
Provision	1,465	1,188	3,817	1,130
Ending Balance	4,938	2,871	4,938	2,871
Unallocated [Member]	'	'	'	'
Allowance for Loan and Lease Losses:	'	'	'	'
Beginning Balance	2,691	'	3,030	'
Charge-offs	'	'	'	'
Recoveries	'	'	'	'
Provision	657	'	318	'
Ending Balance	$3,348	'	$3,348	'

Loans_Leases_and_Other_Real_Es9

Loans, Leases and Other Real Estate - Loans Receivable Summarized by Portfolio Segment and Impairment Method (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	$22,237	$24,619
Ending Balance: Collectively evaluated for impairment	2,591,167	2,445,259
Ending Balance: Loans acquired with deteriorated credit quality	0	411
Total Loans and Leases	2,613,404	2,470,289
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	18,694	18,375
Ending Balance: Collectively evaluated for impairment	1,470,525	1,371,486
Ending Balance: Loans acquired with deteriorated credit quality	'	'
Total Loans and Leases	1,489,219	1,389,861
Commercial, Industrial and Other [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	565	4,175
Ending Balance: Collectively evaluated for impairment	231,396	209,633
Ending Balance: Loans acquired with deteriorated credit quality	'	'
Total Loans and Leases	231,961	213,808
Leases [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	'	'
Ending Balance: Collectively evaluated for impairment	52,285	41,332
Ending Balance: Loans acquired with deteriorated credit quality	'	'
Total Loans and Leases	52,285	41,332
Real Estate-Residential Mortgage [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	1,463	617
Ending Balance: Collectively evaluated for impairment	430,014	432,214
Ending Balance: Loans acquired with deteriorated credit quality	'	'
Total Loans and Leases	431,477	432,831
Real Estate-Construction [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	189	501
Ending Balance: Collectively evaluated for impairment	67,760	52,618
Ending Balance: Loans acquired with deteriorated credit quality	'	'
Total Loans and Leases	67,949	53,119
Home Equity and Consumer [Member]	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending Balance: Individually evaluated for impairment	1,326	951
Ending Balance: Collectively evaluated for impairment	339,187	337,976
Ending Balance: Loans acquired with deteriorated credit quality	'	411
Total Loans and Leases	$340,513	$339,338

Recovered_Sheet1

Loans, Leases and Other Real Estate - Allowance for Loan Losses Summarized by Portfolio Segment and Impairment Classification (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	$1,088	'	$910	$1,438	'	'
Ending Balance: Collectively evaluated for impairment	28,959	'	28,911	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	30,047	29,866	29,821	29,757	29,626	28,931
Commercial, Secured by Real Estate [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	219	'	739	1,044	'	'
Ending Balance: Collectively evaluated for impairment	13,072	'	13,724	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	13,291	14,042	14,463	17,705	18,439	16,258
Commercial, Industrial and Other [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	12	'	31	78	'	'
Ending Balance: Collectively evaluated for impairment	2,983	'	5,300	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	2,995	3,601	5,331	5,110	5,120	5,103
Leases [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	'	'	'	'	'	'
Ending Balance: Collectively evaluated for impairment	828	'	504	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	828	654	504	508	399	578
Real Estate-Residential Mortgage [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	171	'	'	72	'	'
Ending Balance: Collectively evaluated for impairment	3,968	'	3,214	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	4,139	4,231	3,214	3,185	3,121	3,568
Real Estate-Construction [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	'	'	'	41	'	'
Ending Balance: Collectively evaluated for impairment	508	'	542	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	508	536	542	378	371	587
Home Equity and Consumer [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	686	'	140	203	'	'
Ending Balance: Collectively evaluated for impairment	4,252	'	2,597	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	4,938	4,111	2,737	2,871	2,176	2,837
Unallocated [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Ending Balance: Individually evaluated for impairment	'	'	'	'	'	'
Ending Balance: Collectively evaluated for impairment	3,348	'	3,030	'	'	'
Ending Balance: Loans acquired with deteriorated credit quality	'	'	'	'	'	'
Ending Balance	$3,348	$2,691	$3,030	'	'	'

Recovered_Sheet2

Loans, Leases and Other Real Estate - Summary of Restructured Loans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	7	'	12	13
Pre-Modification Outstanding Recorded Investment	$1,528	'	$3,560	$5,610
Post-Modification Outstanding Recorded Investment	1,528	'	3,560	5,604
Commercial, Secured by Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	2	11
Pre-Modification Outstanding Recorded Investment	'	'	1,697	5,472
Post-Modification Outstanding Recorded Investment	'	'	1,697	5,468
Commercial, Industrial and Other [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	'	1
Pre-Modification Outstanding Recorded Investment	'	'	'	127
Post-Modification Outstanding Recorded Investment	'	'	'	125
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	4	'	4	'
Pre-Modification Outstanding Recorded Investment	1,211	'	1,211	'
Post-Modification Outstanding Recorded Investment	1,211	'	1,211	'
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	3	'	6	1
Pre-Modification Outstanding Recorded Investment	317	'	652	11
Post-Modification Outstanding Recorded Investment	$317	'	$652	$11

Recovered_Sheet3

Loans, Leases and Other Real Estate - Summary of Restructured Debt within Last 12 Months that have Subsequently Defaulted (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	2	5
Recorded Investment	$211	$3,084
Commercial, Secured by Real Estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	1	5
Recorded Investment	32	3,084
Commercial, Industrial and Other [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	'
Recorded Investment	'	'
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	1	'
Recorded Investment	179	'
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	'	'

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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Plans, Defined Benefit [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Interest cost	$24	$22	$71	$67
Expected return on plan assets	-24	-18	-72	-54
Amortization of unrecognized net actuarial loss	9	21	29	62
Net periodic benefit expense	$9	$25	$28	$75

Directors_Retirement_Plan_Comp

Directors' Retirement Plan - Components of Net Periodic Plan Cost for Retirement Plan (Detail) (Directors' Retirement Plan [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Directors' Retirement Plan [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$6	$8	$19	$22
Interest cost	10	9	29	27
Amortization of prior service cost	3	3	10	10
Amortization of unrecognized net actuarial loss	1	2	1	6
Net periodic benefit expense	$20	$22	$59	$65

Directors_Retirement_Plan_Addi

Directors' Retirement Plan - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'	'
Contributions made by company to plans	$65,000	$75,000

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, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets/Liabilities:	'	'
Investment securities, available for sale	$444,292	$431,106
U.S. Treasury and U.S. Government Agencies [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	83,179	70,165
Mortgage-Backed Securities, Residential [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	308,554	304,502
Obligations of States and Political Subdivisions [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	29,943	36,873
Equity Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	17,229	16,146
Fair Value, Measurements, Recurring [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	444,292	431,106
Total Assets	444,558	431,668
Total Liabilities	266	562
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	266	562
Assets/Liabilities:	'	'
Other Assets	266	562
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	83,179	70,165
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	313,435	304,502
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	29,943	36,873
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	506	3,420
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	17,229	16,146
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	12,197	7,569
Total Assets	12,197	7,569
Total Liabilities	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | 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	'	'
Assets/Liabilities:	'	'
Other Assets	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	8,241	4,330
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	3,956	3,239
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	432,095	423,537
Total Assets	432,361	424,099
Total Liabilities	266	562
Significant Other Observable Inputs (Level 2) [Member] | 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	266	562
Assets/Liabilities:	'	'
Other Assets	266	562
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	74,938	65,835
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	313,435	304,502
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	29,943	36,873
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	506	3,420
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	13,273	12,907
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Total Assets	'	'
Total Liabilities	'	'
Significant Unobservable Inputs (Level 3) [Member] | 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	'	'
Assets/Liabilities:	'	'
Other Assets	'	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities, Residential [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]	'	'
Assets/Liabilities:	'	'
Investment securities, available for sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'
Assets/Liabilities:	'	'
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, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Impaired Loans and Leases	$22,237	$24,619	$26,061
Loans held for sale	1,519	1,206	'
Other real estate owned and other repossessed assets	982	520	'
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	1,519	1,206	'
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	22,237	24,619	'
Loans held for sale	'	'	'
Other real estate owned and other repossessed assets	$982	$520	'

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, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Short-term municipal bond	6
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 Fair Values of Company's Financial Instruments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Instruments-Assets	'	'
Investment securities held to maturity, Fair Value	$105,127	$100,394
Investment securities held to maturity, Carrying Value	104,909	101,744
Federal Home Loan Bank and other membership bank stocks, Fair Value	8,831	7,938
Federal Home Loan Bank and other membership bank stocks, Carrying Value	8,831	7,938
Loans and leases, net Fair Value	2,583,421	2,432,447
Loans and leases, net Carrying Value	2,581,718	2,439,195
Financial Instruments-Liabilities	'	'
Certificates of Deposit, Fair Value	280,856	296,237
Certificates of Deposit, Carrying value	281,341	296,086
Other borrowings, Fair Value	182,285	121,870
Other borrowings, Carrying value	179,700	119,000
Subordinated debentures, Fair Value	30,929	27,835
Subordinated debentures, Carrying Value	41,238	41,238
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Financial Instruments-Assets	'	'
Investment securities held to maturity, Fair Value	'	'
Federal Home Loan Bank and other membership bank stocks, Fair Value	'	'
Loans and leases, net Fair Value	'	'
Financial Instruments-Liabilities	'	'
Certificates of Deposit, Fair Value	'	'
Other borrowings, Fair Value	'	'
Subordinated debentures, Fair Value	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Financial Instruments-Assets	'	'
Investment securities held to maturity, Fair Value	99,116	95,194
Federal Home Loan Bank and other membership bank stocks, Fair Value	8,831	7,938
Loans and leases, net Fair Value	'	'
Financial Instruments-Liabilities	'	'
Certificates of Deposit, Fair Value	280,856	296,237
Other borrowings, Fair Value	182,285	121,870
Subordinated debentures, Fair Value	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Financial Instruments-Assets	'	'
Investment securities held to maturity, Fair Value	6,011	5,200
Federal Home Loan Bank and other membership bank stocks, Fair Value	'	'
Loans and leases, net Fair Value	2,583,421	2,432,447
Financial Instruments-Liabilities	'	'
Certificates of Deposit, Fair Value	'	'
Other borrowings, Fair Value	'	'
Subordinated debentures, Fair Value	$30,929	$27,835

Derivatives_Additional_Informa

Derivatives - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Securities pledged for collateral	$483,000	$1,500,000

Derivatives_Summary_Informatio

Derivatives - Summary Information Regarding Derivatives (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
3rd Party Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Amount	$17,382	$17,691
Average Maturity (Years)	'6 years	'6 years 8 months 12 days
Weighted Average Rate Fixed	3.84%	3.83%
Weighted Average Variable Rate	'1 Mo Libor + 2.21	'1 Mo Libor + 2.21
Fair Value	-266	-562
Customer Interest Rate Swaps [Member]	'	'
Derivative [Line Items]	'	'
Notional Amount	-17,382	-17,691
Average Maturity (Years)	'6 years	'6 years 8 months 12 days
Weighted Average Rate Fixed	3.84%	3.83%
Weighted Average Variable Rate	'1 Mo Libor + 2.21	'1 Mo Libor + 2.21
Fair Value	$266	$562

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
			Segment
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Goodwill	$109,974,000	'	$109,974,000	'	$109,974,000
Number of reportable unit	'	'	1	'	'
Core deposit intangible	2,700,000	'	2,700,000	'	'
Amortization of core deposit intangible	111,000	123,000	353,000	164,000	'
Somerset Hills Acquisition [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Goodwill	22,900,000	'	22,900,000	'	22,900,000
Prior Acquisitions [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Goodwill	$87,100,000	'	$87,100,000	'	$87,100,000

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'
2014	$111
2015	415
2016	366
2017	316
2018	267
2019	$218