Arrow Financial (AROW) 10-K 17 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 21, 2014	Jun. 30, 2013
Entity Information [Line Items]	'	'	'
Entity Registrant Name	'Arrow Financial Corporation	'	'
Entity Central Index Key	'0000717538	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	12,342,000	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$292,291,158

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and Due from Banks	$37,275	$37,076
Interest-Bearing Deposits at Banks	12,705	11,756
Investment Securities:	'	'
Available-for-sale Securities	457,606	478,698
Held-to-Maturity Securities	299,261	239,803
Federal Home Loan Bank and Federal Reserve Bank Stock	6,281	5,792
Loans	1,266,472	1,172,341
Allowance for Loan Losses	-14,434	-15,298
Net Loans	1,252,038	1,157,043
Premises and Equipment, Net	29,154	28,897
Goodwill	22,003	22,003
Other Intangible Assets, Net	4,140	4,492
Other Assets	43,235	37,236
Total Assets	2,163,698	2,022,796
LIABILITIES	'	'
Noninterest-Bearing Deposits	278,958	247,232
NOW Accounts	817,366	758,287
Savings Deposits	498,779	442,363
Time Deposits of $100,000 or More	78,928	93,375
Other Time Deposits	168,299	189,898
Total Deposits	1,842,330	1,731,155
Short-term Borrowings	64,777	41,678
Federal Home Loan Bank Term Advances	20,000	30,000
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Other Liabilities	24,437	24,138
Total Liabilities	1,971,544	1,846,971
STOCKHOLDERS' EQUITY	'	'
Preferred Stock	0	0
Common Stock	16,744	16,416
Additional Paid-in Capital	229,290	218,650
Retained Earnings	27,457	26,251
Unallocated ESOP Shares	-1,800	-2,150
Accumulated Other Comprehensive Loss	-4,373	-8,462
Treasury Stock	-75,164	-74,880
Total Stockholders' Equity	192,154	175,825
Total Liabilities and Stockholders' Equity	$2,163,698	$2,022,796

Balance_Sheet_Parenthetical_Pa

Balance Sheet Parenthetical (Parentheticals) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Held-to-maturity Securities, at Fair Value	$302,305	$248,252
Preferred Stock, Par Value	$5	$5
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Common Stock, Par Value	$1	$1
Common Stock, Shares Authorized	20,000,000	20,000,000
Common Stock, Shares Issued	16,744,486	16,416,163
Unallocated ESOP Shares - Shares	87,641	102,890
Treasury Stock, Shares	4,296,723	4,288,617

Consolidated_Income_Statement

Consolidated Income Statement (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
INTEREST AND DIVIDEND INCOME	'		'		'
Interest and Fees on Loans	$51,319		$54,511		$58,599
Interest on Deposits at Banks	89		108		99
Interest and Dividends on Investment Securities:	'		'		'
Fully Taxable	6,903		9,269		12,402
Exempt from Federal Taxes	5,827		5,491		5,691
Total Interest and Dividend Income	64,138		69,379		76,791
INTEREST EXPENSE	'		'		'
NOW Accounts	2,461		3,564		5,052
Savings Deposits	1,024		1,287		1,898
Time Deposits of $100,000 or More	1,198		2,007		2,633
Other Time Deposits	1,962		3,730		5,143
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	18		22		74
Federal Home Loan Bank Advances	680		729		3,295
Junior Subordinated Obligations Issued to Unconsolidated Subsidary Trusts	579		618		584
Total Interest Expense	7,922		11,957		18,679
NET INTEREST INCOME	56,216		57,422		58,112
Provision for Loan Losses	200		845		845
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	56,016		56,577		57,267
NONINTEREST INCOME	'		'		'
Income from Fiduciary Activities	6,735		6,290		6,113
Fees for Other Services to Customers	9,407		8,245		8,034
Insurance Commissions	8,895		8,247		7,374
Net Gains on Securities Transactions	540		865		2,795
Net Gains on Sale of Loans	1,460		2,282		866
Other Operating Income	1,024		1,170		746
Total Noninterest Income	28,061		27,099		25,928
NONINTEREST EXPENSE	'		'		'
Salaries and Employee Benefits	31,182		31,703		30,205
Occupancy Expense, Net	8,285		7,467		7,369
FDIC Assessments	1,080		1,026		1,292
Prepayment Penalty on FHLB Advances	0		0		1,638
Other Operating Expense	12,656		11,640		11,044
Total Noninterest Expense	53,203		51,836		51,548
INCOME BEFORE PROVISION FOR INCOME TAXES	30,874		31,840		31,647
Income Tax Expense (Benefit)	9,079		9,661		9,714
Net Income	$21,795		$22,179		$21,933
Average Shares Outstanding:	'		'		'
Basic Shares, in Shares	12,296	[1]	12,247	[1]	12,209	[1]
Diluted Shares, in Shares	12,327	[1]	12,257	[1]	12,221	[1]
Per Common Share	'		'		'
Basic Earnings, in Earnings Per Share	$1.77	[1]	$1.81	[1]	$1.80	[1]
Diluted Earnings, In Earnings Per Share	$1.77	[1]	$1.81	[1]	$1.79	[1]
[1]	Share and Per Share Amounts have been restated for the September 2013 2% stock dividend.

Statement_of_Comprehensive_Inc

Statement of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$21,795	$22,179	$21,933
Other Comprehensive Income (Loss), Net of Tax	3,500	-2,246	879
Reclassification from Accumulated Other Comprehensive Income	589	479	-1,151
Other Comprehensive (Loss) Income	4,089	-1,767	-272
Comprehensive Income (Loss), Net of Tax	25,884	20,412	21,661
Unrealized Gains and Losses on Available for Sale Securities	'	'	'
Other Comprehensive Income (Loss), Net of Tax	-2,925	-661	4,741
Reclassification from Accumulated Other Comprehensive Income	-326	-522	-1,688
Other Comprehensive (Loss) Income	-3,251	-1,183	3,053
Defined Benefit Plans, Net Gain (Loss) [Member]	'	'	'
Reclassification from Accumulated Other Comprehensive Income	914	1,013	602
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Unamortized Gain (Loss)	6,425	-1,340	-3,701
Other Comprehensive (Loss) Income	7,339	-327	-3,099
Defined Benefit Plans, Net Prior Service Cost (Credit) [Member]	'	'	'
Reclassification from Accumulated Other Comprehensive Income	1	-12	-65
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Prior Service (Cost) Credit	0	-245	-161
Other Comprehensive (Loss) Income	$1	($257)	($226)

Statement_of_Stockholders_Equi

Statement of Stockholders' Equity (USD $)		Total	Common Stock	Additional Paid in Capital	Retained Earnings	Unallocated ESOP Shares	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
In Thousands
Stockholder's Equity Beginning Balance at Dec. 31, 2010		$152,259	$15,626	$191,068	$24,577	($2,876)	($6,423)	($69,713)
Net Income		21,933	0	0	21,933	0	0	0
Other Comprehensive (Loss) Income		-272	0	0	0	0	-272	0
Stock Dividend		0	468	10,647	-11,115	0	0	0
Cash Dividends Paid	[1]	-11,448	0	0	-11,448	0	0	0
Shares Issued for Stock Options Exercised, net		1,413	0	705	0	0	0	708
Shares Issued Under the Directors' Stock Plan		175	0	104	0	0	0	71
Shares Issued Under the Employee Stock Purchase Plan		474	0	282	0	0	0	192
Shares Issued for Dividend Reinvestment Plans		1,796	0	1,062	0	0	0	734
Stock-Based Compensation Expense		354	0	354	0	0	0	0
Tax Benefit for Exercises of Stock Options		51	0	51	0	0	0	0
Purchases of Treasury Stock		-6,039	0	0	0	0	0	-6,039
Shares Issued for Acquisition of Subsidiary		5,261	0	3,275	0	0	0	1,986
Allocation of ESOP Stock		428	0	52	0	376	0	0
Stockholder's Equity Ending Balance at Dec. 31, 2011		166,385	16,094	207,600	23,947	-2,500	-6,695	-72,061
Net Income		22,179	0	0	22,179	0	0	0
Other Comprehensive (Loss) Income		-1,767	0	0	0	0	-1,767	0
Stock Dividend		0	322	7,738	-8,060	0	0	0
Cash Dividends Paid	[1]	-11,815	0	0	-11,815	0	0	0
Shares Issued for Stock Options Exercised, net		2,105	0	1,152	0	0	0	953
Shares Issued Under the Directors' Stock Plan		175	0	104	0	0	0	71
Shares Issued Under the Employee Stock Purchase Plan		484	0	279	0	0	0	205
Shares Issued for Dividend Reinvestment Plans		1,822	0	1,086	0	0	0	736
Stock-Based Compensation Expense		424	0	424	0	0	0	0
Tax Benefit for Exercises of Stock Options		68	0	68	0	0	0	0
Purchases of Treasury Stock		-4,877	0	0	0	0	0	-4,877
Shares Issued for Acquisition of Subsidiary		233	0	140	0	0	0	93
Allocation of ESOP Stock		409	0	59	0	350	0	0
Stockholder's Equity Ending Balance at Dec. 31, 2012		175,825	16,416	218,650	26,251	-2,150	-8,462	-74,880
Net Income		21,795	0	0	21,795	0	0	0
Other Comprehensive (Loss) Income		4,089	0	0	0	0	4,089	0
Stock Dividend		0	328	8,152	-8,480	0	0	0
Cash Dividends Paid	[1]	-12,109	0	0	-12,109	0	0	0
Shares Issued for Stock Options Exercised, net		1,254	0	676	0	0	0	578
Shares Issued Under the Directors' Stock Plan		198	0	123	0	0	0	75
Shares Issued Under the Employee Stock Purchase Plan		477	0	283	0	0	0	194
Shares Issued for Dividend Reinvestment Plans		1,280	0	796	0	0	0	484
Stock-Based Compensation Expense		372	0	372	0	0	0	0
Tax Benefit for Exercises of Stock Options		23	0	23	0	0	0	0
Purchases of Treasury Stock		-1,709	0	0	0	0	0	-1,709
Shares Issued for Acquisition of Subsidiary		233	0	139	0	0	0	94
Allocation of ESOP Stock		426	0	76	0	350	0	0
Stockholder's Equity Ending Balance at Dec. 31, 2013		$192,154	$16,744	$229,290	$27,457	($1,800)	($4,373)	($75,164)
[1]	Cash dividends paid per share have been adjusted for the September 2013 2% stock dividend.

Stockholders_Equity_Parentheti

Stockholder's Equity Parenthetical (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Dividends Paid, per Share	$0.99	$0.97	$0.94
Stock Dividends - Shares	328,323	321,886	468,765
Stock Options Exercised - Shares	58,719	96,471	72,802
Shares Issued Under Directors Stock Plan - Shares	7,643	7,226	7,456
Shares Issued Under the Employee Stock Purchase Plan - Shares	19,679	20,687	20,484
Shares Issued for Dividend Reinvestment Plans - Shares	49,574	74,260	76,447
Purchase of Treasury Stock - Shares	68,361	199,323	251,962
Acquisition of Subsidiary - Shares	9,503	9,356	221,517
Allocation of ESOP Stock - Shares	16,969	16,629	18,216

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash Flows from Operating Activities:	'		'		'
Net Income	$21,795		$22,179		$21,933
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:	'		'		'
Provision for Loan Losses	200		845		845
Depreciation and Amortization	8,870		8,856		6,509
Allocation of ESOP Stock	426		409		428
Gains on the Sale of Securities Available-for-Sale	-527		-949		-2,795
Gains on the Sale of Securities Held-to-Maturity	-18		0		0
Losses on the Sale of Securities Available-for-Sale	0		84		0
Losses on the Sale of Securities Held-to-Maturity	5		0		0
Loans Originated and Held-for-Sale	-46,101		-60,668		-39,111
Proceeds from the Sale of Loans Held-for-Sale	50,298		61,041		49,378
Net Gains on the Sale of Loans	-1,460		-2,282		-866
Net Loss (Gains) on the Sale of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	120		-71		-32
Contributions to Pension Plans	-473		-328		-5,319
Deferred Income Tax Expense Expense (Benefit)	294		-353		2,172
Shares Issued Under the Directors' Stock Plan	198		175		175
Stock-Based Compensation Expense	372		424		354
Net Decrease in Other Assets	1,888		2,108		1,725
Net Increase in Other Liabilities	786		990		689
Net Cash Provided By Operating Activities	36,673		32,460		36,085
Cash Flows from Investing Activities:	'		'		'
Proceeds from the Sale of Securities Available-for-Sale	16,295		58,718		39,009
Proceeds from the Maturities and Calls of Securities Available-for-Sale	132,228		210,224		280,126
Purchases of Securities Available-for-Sale	-136,416		-197,029		-354,310
Proceesd from the Sale of Securities Held-to-Maturity	1,181		0		0
Proceeds from the Maturities and Calls of Securities Held-to-Maturity	47,228		49,983		40,692
Purchases of Securities Held-to-Maturity	-109,620		-140,635		-31,701
Net (Increase) Decrease in Loans	-98,903		-40,951		3,108
Proceeds from the Sales of Premises and Equipment, Other Real Estate Owned and Repossessed Assets	1,789		1,263		770
Purchases of Premises and Equipment	-2,233		-8,073		-5,372
Cash Paid for Subsidiaries	-75		-75		-3,296
Net (Increase) Decrease in Federal Home Loan Bank Stock	-489		930		1,880
Purchase of Bank Owned Life Insurance	0		0		-15,702
Net Cash Provided by (Used In) Investing Activities	-149,015		-65,645		-44,796
Cash Flows from Financing Activities:	'		'		'
Net Increase in Deposits	111,175		87,109		110,042
Net Increase (Decrease) in Short-Term Borrowings	23,099		-26,615		15,079
Federal Home Loan Bank Advances	0		0		10,000
Repayments of Federal Home Loan Bank Advances	-10,000		-10,000		-100,000
Purchases of Treasury Stock	-1,709		-4,877		-6,039
Shares Issued for Stock Options Exercised, net	1,254		2,105		1,413
Shares Issued Under the Employee Stock Purchase Plan	477		484		474
Tax Benefit for Exercises of Stock Options	23		68		51
Shares Issued for Dividend Reinvestment Plans	1,280		1,822		1,796
Cash Dividends Paid	-12,109	[1]	-11,815	[1]	-11,448	[1]
Net Cash Provided By Financing Activities	113,490		38,281		21,368
Net Increase in Cash and Cash Equivalents	1,148		5,096		12,657
Cash and Cash Equivalents at Beginning of Year	48,832		43,736		31,079
Cash and Cash Equivalents at End of Year	49,980		48,832		43,736
Supplemental Disclosures to Statements of Cash Flow Information:	'		'		'
Interest on Deposits and Borrowings	8,067		12,520		19,490
Income Taxes	8,336		8,866		7,952
Non-cash Investing and Financing Activities:	'		'		'
Transfer of Loans to Other Real Estate Owned and Repossessed Assets	971		1,426		1,011
Shares Issued for Acquisition of Subsidiary	233		233		5,261
Fair Value of Assets from Acquisition of Subsidiary	0		0		10,638
Fair Value of Liabilities from Acquisition of Subsidiary	$0		$0		$2,081
[1]	Cash dividends paid per share have been adjusted for the September 2013 2% stock dividend.

Risks_and_Uncertainties

Risks and Uncertainties	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
Risks and Uncertainties [Text Block]	'
	RISKS AND UNCERTAINTIES
	Nature of Operations - Arrow Financial Corporation, a New York corporation, was incorporated on March 21, 1983 and is registered as a bank holding company within the meaning of the Bank Holding Company Act of 1956. Arrow derives most of its earnings from the ownership of two nationally chartered commercial banks and through the ownership of four insurance agencies. The two banks provide a full range of services to individuals and small to mid-size businesses in northeastern New York State from just north of Albany, the State's capitol, to the Canadian border. Both banks have trust departments which provide investment management and administrative services. The insurance agencies specialize in property and casualty insurance, group health insurance, sports accident and health insurance, and individual life insurance.
	Management’s Use of Estimates - The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of income and expenses during the reporting period.  Our most significant estimates are the allowance for loan losses, the evaluation of other-than-temporary impairment of investment securities, goodwill impairment, pension and other postretirement liabilities, analysis of a need for a valuation allowance for deferred tax assets and other fair value calculations. Actual results could differ from those estimates.
	A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses.  The allowance for loan losses is management’s best estimate of probable loan losses incurred as of the balance sheet date.  While management uses available information to recognize losses on loans, future adjustments to the allowance for loan losses may be necessary based on changes in economic conditions.
	Concentrations of Credit - Virtually all of Arrow's loans are with customers in upstate New York.  Although the loan portfolios of the subsidiary banks are well diversified, tourism has a substantial impact on the northeastern New York economy.  The commitments to extend credit are fairly consistent with the distribution of loans presented in Note 5, generally have the same credit risk and are subject to normal credit policies.  Generally, the loans are secured by assets and are expected to be repaid from cash flow or the sale of selected assets of the borrowers.  Arrow evaluates each customer's creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by Arrow upon extension of credit, is based upon management's credit evaluation of the counterparty.  The nature of the collateral varies with the type of loan and may include:  residential real estate, cash and securities, inventory, accounts receivable, property, plant and equipment, income producing commercial properties and automobiles.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies [Text Block]	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Principles of Consolidation - The financial statements of Arrow and its wholly owned subsidiaries are consolidated and all material inter-company transactions have been eliminated.  In the “Parent Company Only” financial statements in Note 20, the investment in wholly owned subsidiaries is carried under the equity method of accounting.  When necessary, prior years’ consolidated financial statements have been reclassified to conform to the current-year financial statement presentation.
	Segment Reporting - Arrow operations are primarily in the community banking industry, which constitutes Arrow’s only segment for financial reporting purposes.  Arrow provides other services, such as trust administration, retirement plan administration, advice to our proprietary mutual funds and insurance products, but these services do not rise to the quantitative thresholds for separate disclosure.  Arrow operates primarily in the northeastern region of New York State in Warren, Washington, Saratoga, Essex and Clinton counties and surrounding areas.
	Cash and Cash Equivalents - Cash and cash equivalents include the following items:  cash at branches, due from bank balances, cash items in the process of collection, interest-bearing bank balances and federal funds sold.
	Securities - Management determines the appropriate classification of securities at the time of purchase.  Securities reported as held-to-maturity are those debt securities which Arrow has both the positive intent and ability to hold to maturity and are stated at amortized cost.  Securities available-for-sale are reported at fair value, with unrealized gains and losses reported in accumulated other comprehensive income or loss, net of taxes.  Realized gains and losses are based upon the amortized cost of the specific security sold.  A decline in the fair value of any available-for-sale or held-to-maturity security below cost that is deemed to be other-than-temporary results in an impairment to reduce the carrying amount to fair value.  To determine whether an impairment is other-than-temporary, we consider all available information relevant to the collectibility of the security, including past events, current conditions, and reasonable and supportable forecasts when developing an estimate of cash flows expected to be collected.  Evidence considered in this assessment includes the reasons for impairment, the severity and duration of the impairment, changes in value subsequent to year-end, forecasted performance of the investee, and the general market condition in the geographic area or industry the investee operates in.  When an other-than-temporary impairment has occurred on a debt security, the amount of the other-than-temporary impairment recognized in earnings depends on whether we intend to sell the debt security or more likely than not will be required to sell the debt security before recovery of its amortized cost basis less any current-period credit loss.  If we intend to sell the debt security or it is more likely than not that we will be required to sell the debt security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment is recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date.  If we do not intend to sell the debt security and it is not more likely than not that we will be required to sell the debt security before recovery of its amortized cost basis, the other-than-temporary impairment is separated into the amount representing the credit loss and the amount related to all other factors.  The amount of the total other-than-temporary impairment related to the credit loss is recognized in earnings.  The amount of the total other-than-temporary impairment related to other factors is recognized in other comprehensive income, net of applicable income taxes.
	Loans and Allowance for Loan Losses - Interest income on loans is accrued and credited to income based upon the principal amount outstanding.  Loan fees and costs directly associated with loan originations are deferred and amortized/accreted as an adjustment to yield over the lives of the loans originated.
	From time-to-time, Arrow has sold (most with servicing retained) residential real estate loans at or shortly after origination.  Any gain or loss on the sale of loans, along with the value of the servicing right, is recognized at the time of sale as the difference between the recorded basis in the loan and net proceeds from the sale.  Loans held for sale are recorded at the lower of cost or fair value on an aggregate basis.
	Loans are placed on nonaccrual status either due to the delinquency status of principal and/or interest or a judgment by management that the full repayment of principal and interest is unlikely. Unless already placed on nonaccrual status, loans secured by home equity lines of credit are put on nonaccrual status when 120 days past due; residential real estate loans when 150 days past due; commercial and commercial real estate loans are evaluated on a loan-by-loan basis and are placed on nonaccrual status when 90 days past due if the full collection of principal and interest is uncertain. The balance of any accrued interest deemed uncollectible at the date the loan is placed on nonaccrual status is reversed, generally against interest income.  A loan is returned to accrual status at the later of the date when the past due status of the loan falls below the threshold for nonaccrual status or management deems that it is likely that the borrower will repay all interest and principal.  For payments received while the loan is on nonaccrual status, we may recognize interest income on a cash basis if the repayment of the remaining principal and accrued interest is deemed likely.
	The allowance for loan losses is maintained by charges to operations based upon our best estimate of the probable amount of loans that we will be unable to collect based on current information and events.  Provisions to the allowance for loan losses are offset by actual loan charge-offs (net of any recoveries).  We evaluate the loan portfolio for potential charge-offs on a monthly basis.  In general, automobile and other consumer loans are charged-off when 120 days delinquent.  Residential real estate loans are charged-off when a loss becomes known or based on a new appraisal at the earlier of 180 days past due or repossession.  Commercial and commercial real estate loans loans are evaluated early in their delinquency status and are charged-off when management concludes that not all principal will be repaid from on-going cash flows or liquidation of collateral. An evaluation of estimated proceeds from the liquidation of the loan’s collateral is compared to the loan carrying amount and a charge to the allowance for loan losses is taken for any deficiency.  While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions in Arrow's market area.  In addition, various Federal regulatory agencies, as an integral part of their examination process, review Arrow's allowance for loan losses. Such agencies may require Arrow to recognize additions to the allowance in future periods, based on their judgments about information available to them at the time of their examination, which may not be currently available to management.
	We consider nonaccrual loans over $250 thousand and all troubled debt restructured loans to be impaired loans and we evaluate these loans individually to determine the amount of impairment, if any. The amount of impairment, if any, related to individual impaired loans is measured based on either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's observable market price or the fair value of the collateral if the loan is collateral dependent. Arrow determines impairment for collateral dependent loans based on the fair value of the collateral less estimated costs to sell. Any excess of the recorded investment in the collateral dependent impaired loan over the estimated collateral value, less costs to sell, is typically charged off. For impaired loans which are not collateral dependent, impairment is measured by comparing the recorded investment in the loan to the present value of the expected cash flows, discounted at the loan’s effective interest rate.  If this amount is less than the recorded investment in the loan, an impairment reserve is recognized as part of the allowance for loan losses, or based upon the judgment of management all or a portion of the excess of the recorded investment in the loan over the present value of the estimated future cash flow may be charged off.
	The allowance for loan losses on the remaining loans is primarily determined based upon consideration of the historical net loss experience of the respective portfolios, adjusted as necessary based upon consideration of qualitative considerations impacting the inherent risk of loss in the respective loan portfolios.
	In management’s opinion, the balance of the allowance for loan losses, at each balance sheet date, is sufficient to provide for probable loan losses inherent in the corresponding loan portfolio.
	Other Real Estate Owned and Repossessed Assets - Real estate acquired by foreclosure and assets acquired by repossession are recorded at the fair value of the property less estimated costs to sell at the time of repossession.  Subsequent declines in fair value, after transfer to other real estate owned and repossessed assets are recognized through a valuation allowance. Such declines in fair value along with related operating expenses to administer such properties or assets are charged directly to operating expense.
	Premises and Equipment - Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization included in operating expenses are computed largely on the straight-line method. Depreciation is based on the estimated useful lives of the assets (buildings and improvements 20-40 years; furniture and equipment 7-10 years; data processing equipment 5-7 years) and, in the case of leasehold improvements, amortization is computed over the terms of the respective leases or their estimated useful lives, whichever is shorter.  Gains or losses on disposition are reflected in earnings.
	Income Taxes - Arrow accounts for income taxes under the asset and liability method.  Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases.  Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income tax expense in the period that includes the enactment date.  Arrow’s policy is that deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
	Goodwill and Other Intangible Assets - Identifiable intangible assets acquired in a business combination are capitalized and amortized.  Any remaining unidentifiable intangible asset is classified as goodwill, for which amortization is not required but which must be evaluated for impairment.  Arrow tests for impairment of goodwill on an annual basis, or when events and circumstances indicate potential impairment.  In evaluating goodwill for impairment, Arrow first assesses certain qualitative factors to determine if it is more likely than not that the fair value of the reporting unit is less than its carrying value. If it is more likely than not that the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired. If the carrying amount of a reporting unit exceeds its fair value, the second step of the goodwill impairment test is performed to measure the amount of impairment loss, if any.
	The carrying amounts of other recognized intangible assets that meet recognition criteria and for which separate accounting records have been maintained (core deposit intangibles and mortgage servicing rights), have been included in the consolidated balance sheet as “Other Intangible Assets, Net.”  Core deposit intangibles are being amortized on a straight-line basis over a period of ten to fifteen years.
	Arrow has sold residential real estate loans, primarily to Freddie Mac, with servicing retained.   Mortgage servicing rights are recognized as an asset when loans are sold with servicing retained, by allocating the cost of an originated mortgage loan between the loan and servicing right based on estimated relative fair values.  The cost allocated to the servicing right is capitalized as a separate asset and amortized in proportion to, and over the period of, estimated net servicing income.  Capitalized mortgage servicing rights are evaluated for impairment by comparing the asset’s carrying value to its current estimated fair value.  Fair values are estimated using a discounted cash flow approach, which considers future servicing income and costs, current market interest rates, and anticipated prepayment, and default rates.  Impairment losses are recognized through a valuation allowance for servicing rights having a current fair value that is less than amortized cost on an aggregate basis.  Adjustments to increase or decrease the valuation allowance are charged or credited to income as a component of other operating income.
	Pension and Postretirement Benefits - Arrow maintains a non-contributory, defined benefit pension plan covering substantially all employees, a supplemental pension plan covering certain executive officers selected by the Board of Directors, and certain post-retirement medical, dental and life insurance benefits for employees and retirees.  The costs of these plans, based on actuarial computations of current and future benefits for employees, are charged to current operating expenses. The cost of post-retirement benefits other than pensions is recognized on an accrual basis as employees perform services to earn the benefits.  Arrow recognizes the overfunded or underfunded status of our single employer defined benefit pension plan as an asset or liability on its consolidated balance sheet and recognizes changes in the funded status in comprehensive income in the year in which the change occurred.
	Prior service costs or credits are amortized on a straight-line basis over the average remaining service period of active participants.  Gains and losses in excess of 10% of the greater of the benefit obligation or the fair value of assets are amortized over the average remaining service period of active participants.
	The discount rate assumption is determined by preparing an analysis of the respective plan’s expected future cash flows and high-quality fixed-income investments currently available and expected to be available during the period to maturity of the pension benefits.
	Stock-Based Compensation Plans - Arrow has two stock option plans, which are described more fully in Note 12.  The Company expenses the grant date fair value of options granted.  The expense is recognized over the vesting period of the grant, typically four years, on a straight-line basis. Shares are generally issued from treasury for the exercise of stock options.
	Arrow sponsors an Employee Stock Purchase Plan ("ESPP") under which employees may purchase Arrow’s common stock at a 5% discount below market price at the time of purchase. This stock purchase plan is not considered a compensatory plan.
	Arrow sponsors an Employee Stock Ownership Plan ("ESOP"), a qualified defined contribution plan.   The ESOP has borrowed funds from one of Arrow’s subsidiary banks to purchase Arrow common stock.  The shares pledged as collateral are reported as a reduction of Arrow’s stockholders’ equity.  Compensation expense is recognized as shares are released for allocation to individual employee accounts equal to the current average market price.
	Securities Sold Under Agreements to Repurchase - In securities repurchase agreements, Arrow receives cash from a counterparty in exchange for the transfer of securities to a third party custodian’s account that explicitly recognizes Arrow’s interest in the securities.  These agreements are accounted for by Arrow as secured financing transactions, since it maintains effective control over the transferred securities, and meets other criteria for such accounting.  Accordingly, the cash proceeds are recorded as borrowed funds, and the underlying securities continue to be carried in Arrow’s securities available-for-sale portfolio.
	Earnings Per Share (“EPS”) - Basic EPS excludes dilution and is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period.  Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as Arrow’s stock options), computed using the treasury stock method.  Unallocated common shares held by Arrow’s Employee Stock Ownership Plan are not included in the weighted average number of common shares outstanding for either the basic or diluted EPS calculation.
	Financial Instruments - Arrow is a party to certain financial instruments with off-balance sheet risk, such as:  commercial lines of credit, construction lines of credit, overdraft protection, home equity lines of credit and standby letters of credit.  Arrow's policy is to record such instruments when funded.  Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument.  These estimates do not reflect any premium or discount that could result from offering for sale at one time Arrow's entire holdings of a particular financial instrument.  Because no market exists for a significant portion of Arrow's financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors.  These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision.  Changes in assumptions could significantly affect the estimates.
	Fair value estimates are based on existing on- and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments.  For example, Arrow has a trust department that contributes net fee income annually.  The value of trust department customer relationships is not considered a financial instrument of the Company, and therefore this value has not been incorporated into the fair value estimates. Other significant assets and liabilities that are not considered financial assets or liabilities include deferred taxes, premises and equipment, the value of low-cost, long-term core deposits and goodwill.  In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of the estimates.
	The carrying amount of the following short-term assets and liabilities is a reasonable estimate of fair value: cash and due from banks, federal funds sold and purchased, securities sold under agreements to repurchase, demand deposits, savings, N.O.W. and money market deposits, other short-term borrowings, accrued interest receivable and accrued interest payable.  The fair value estimates of other on- and off-balance sheet financial instruments, as well as the method of arriving at fair value estimates, are included in the related footnotes and summarized in Note 17.
	Fair Value Measures - We determine the fair value of financial instruments under the following hierarchy:
	•	Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
	•	Level 2 – Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability;
	•	Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	Management’s Use of Estimates -The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of income and expenses during the reporting period.  Our most significant estimates are the allowance for loan losses, the evaluation of other-than-temporary impairment of investment securities, goodwill impairment, pension and other postretirement liabilities, analysis of a need for a valuation allowance for deferred tax assets and other fair value calculations. Actual results could differ from those estimates.
	A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses.  In connection with the determination of the allowance for loan losses, management obtains appraisals for properties.  The allowance for loan losses is management’s best estimate of probable loan losses incurred as of the balance sheet date.  While management uses available information to recognize losses on loans, future adjustments to the allowance for loan losses may be necessary based on changes in economic conditions.
	Recent Accounting Pronouncements
	During 2013 the FASB issued twelve accounting standards updates and, through the date of this report, an additional five in 2014. Of the seventeen updates, fourteen did not apply to Arrow.
	ASU 2013-02 "Comprehensive Income" requires additional disclosures relating to reclassifications out of accumulated other comprehensive income. The new disclosures are included in Note 5 - Comprehensive Income.
	ASU 2013-10 "Derivatives and Hedging" now allows the federal funds effective swap rate as a benchmark interest rate for hedge accounting. While this has no current impact on Arrow, it may provide us an option for future swaps that we did not have before the ASU.
	ASU 2014-01 "Investments-Equity Method and Joint Ventures" allows an entity that invests in affordable housing projects that qualify for low-income housing tax credits to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. The standard is effective for annual years beginning after December 15, 2014, with earlier adoption allowed. We are evaluating the impact of adopting this election and do not expect that this will have a material impact on our financial condition or results of operations.
	ASU 2014-04 "Receivables - Trouble Debt Restructurings by Creditors" provides additional guidance on when an in substance repossession or foreclosure occurs and is effective for annual periods beginning after December 15, 2014. We are evaluating the impact of adopting this standard, and we do not expect that it will have a material impact on our financial condition or results of operations.

Cash_and_Cash_Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2013
Cash and Cash Equivalents [Abstract]	'
Cash and Cash Equivalents Disclosure [Text Block]	'
	CASH AND CASH EQUIVALENTS (Dollars In Thousands)
	The following table is the schedule of cash and cash equivalents at December 31, 2013 and 2012:
		2013		2012
	Cash and Due From Banks	$	37,275	$	37,076
	Interest-Bearing Deposits at Banks	12,705		11,756
	Total Cash and Cash Equivalents	$	49,980	$	48,832
	Supplemental Information:
	Total required reserves, including vault cash and Federal Reserve Bank deposits	$	18,879	$	23,168
	The Company is required to maintain reserve balances with the Federal Reserve Bank of New York. The required reserve is calculated on a fourteen day average and the amounts presented in the table above represent the average for the period that includes December 31.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	'
		INVESTMENT SECURITIES (Dollars In Thousands)
	The following table is the schedule of Available-For-Sale Securities at December 31, 2013 and 2012:
	Available-For-Sale Securities
			U.S. Agency			State and		Mortgage-		Corporate		Mutual Funds		Total
			Obligations			Municipal		Backed		and Other		and Equity		Available-
						Obligations		Securities -		Debt		Securities		For-Sale
								Residential		Securities				Securities
	December 31, 2013
	Available-For-Sale Securities,		$	136,868		$	127,224	$	171,321	$	17,142	$	1,120	$	453,675
	at Amortized Cost
	Available-For-Sale Securities,		136,475			127,389		175,778		16,798		1,166		457,606
	at Fair Value
	Gross Unrealized Gains		2			306		4,714		10		46		5,078
	Gross Unrealized Losses		395			141		257		354		—		1,147
	Available-For-Sale Securities,													243,769
	Pledged as Collateral
	Maturities of Debt Securities,
	at Amortized Cost:
	Within One Year		—			48,570		10,920		—				59,490
	From 1 - 5 Years		136,868			76,308		146,677		16,142				375,995
	From 5 - 10 Years		—			1,666		13,608		—				15,274
	Over 10 Years		—			680		116		1,000				1,796
	Available-For-Sale Securities
			U.S. Agency			State and		Mortgage-		Corporate		Mutual Funds		Total
			Obligations			Municipal		Backed		and Other		and Equity		Available-
						Obligations		Securities -		Debt		Securities		For-Sale
								Residential		Securities				Securities
	Maturities of Debt Securities,
	at Fair Value:
	Within One Year		—			48,623		11,181		—				59,804
	From 1 - 5 Years		136,475			76,405		150,330		15,998				379,208
	From 5 - 10 Years		—			1,681		14,146		—				15,827
	Over 10 Years		—			680		121		800				1,601
	Securities in a Continuous
	Loss Position, at Fair Value:
	Less than 12 Months		$	60,664		$	29,967	$	15,190	$	7,375	$	—	$	113,196
	12 Months or Longer		33,849			4,597		11,841		6,063		—		56,350
	Total		$	94,513		$	34,564	$	27,031	$	13,438	$	—	$	169,546
	Number of Securities in a		26			107		13		19		—		165
	Continuous Loss Position
	Unrealized Losses on
	Securities in a Continuous
	Loss Position:
	Less than 12 Months		$	336		$	120	$	108	$	92	$	—	$	656
	12 Months or Longer		59			21		149		262		—		491
	Total		$	395		$	141	$	257	$	354	$	—	$	1,147
	December 31, 2012
	Available-For-Sale Securities,		$	122,297		$	84,798	$	252,480	$	8,689	$	1,120	$	469,384
	at Amortized Cost
	Available-For-Sale Securities,		122,457			84,838		261,804		8,451		1,148		478,698
	at Fair Value
	Gross Unrealized Gains		204			206		9,405		—		28		9,843
	Gross Unrealized Losses		44			166		81		238		—		529
	Available-For-Sale Securities,													260,292
	Pledged as Collateral
	Securities in a Continuous
	Loss Position, at Fair Value:
	Less than 12 Months		$	72,531		$	46,627	$	10,230	$	8,451	$	—	$	137,839
	12 Months or Longer		—			2,149		4,968		—		—		7,117
	Total		$	72,531		$	48,776	$	15,198	$	8,451	$	—	$	144,956
	Number of Securities in a		22			198		7		11		—		238
	Continuous Loss Position
	Unrealized Losses on
Securities in a Continuous
Loss Position:
Less than 12 Months		$	44		$	160	$	50	$	238	$	—	$	492
12 Months or Longer		—			6		31		—		—		37
Total		$	44		$	166	$	81	$	238	$	—	$	529
The following table is the schedule of Held-To-Maturity Securities at December 31, 2013 and 2012:
Held-To-Maturity Securities
		State and			Mortgage-		Corporate		Total
		Municipal			Backed		and Other		Held-To
		Obligations			Securities -		Debt		Maturity
					Residential		Securities		Securities
December 31, 2013
Held-To-Maturity Securities,		$	198,206		$	100,055	$	1,000	$	299,261
at Amortized Cost
Held-To-Maturity Securities,		202,390			98,915		1,000		302,305
at Fair Value
Gross Unrealized Gains		4,762			24		—		4,786
Gross Unrealized Losses		578			1,164		—		1,742
Held-To-Maturity Securities,									298,261
Pledged as Collateral
Maturities of Debt Securities,
at Amortized Cost:
Within One Year		43,043			—		—		43,043
From 1 - 5 Years		82,001			41,958		—		123,959
From 5 - 10 Years		69,832			58,097		—		127,929
Over 10 Years		3,330			—		1,000		4,330
Maturities of Debt Securities,
at Fair Value:
Within One Year		43,113			—		—		43,113
From 1 - 5 Years		83,896			41,788		—		125,684
From 5 - 10 Years		71,967			57,127		—		129,094
Over 10 Years		3,414			—		1,000		4,414
Securities in a Continuous
Loss Position, at Fair Value:
Less than 12 Months		$	23,633		$	85,339	$	—	$	108,972
12 Months or Longer		5,111			—		—		5,111
Total		$	28,744		$	85,339	$	—	$	114,083
Number of Securities in a		101			36		—		137
Continuous Loss Position
Unrealized Losses on
Securities in a Continuous
Loss Position:
Less than 12 Months		$	519		$	1,164	$	—	$	1,683
12 Months or Longer		59			—		—		59
Total		$	578		$	1,164	$	—	$	1,742
December 31, 2012
Held-To-Maturity Securities,		$	183,373		$	55,430	$	1,000	$	239,803
at Amortized Cost
Held-To-Maturity Securities,		191,196			56,056		1,000		248,252
at Fair Value
Gross Unrealized Gains		7,886			626		—		8,512
Gross Unrealized Losses		63			—		—		63
Held-To-Maturity Securities,									238,803
Pledged as Collateral
Held-To-Maturity Securities
		State and			Mortgage-		Corporate		Total
		Municipal			Backed		and Other		Held-To
		Obligations			Securities -		Debt		Maturity
					Residential		Securities		Securities
Securities in a Continuous
Loss Position, at Fair Value:
Less than 12 Months		$	21,583		$	—	$	—	$	21,583
12 Months or Longer		503			—		—		503
Total		$	22,086		$	—	$	—	$	22,086
Number of Securities in a		61			—		—		61
Continuous Loss Position
Unrealized Losses on
Securities in a Continuous
Loss Position:
Less than 12 Months		$	62		$	—	$	—	$	62
12 Months or Longer		1			—		—		1
Total		$	63		$	—	$	—	$	63
In the tables above, maturities of mortgage-backed-securities - residential are included based on their expected average lives.  Actual maturities will differ from the table below because issuers may have the right to call or prepay obligations with or without prepayment penalties.
In the available-for-sale category at December 31, 2013, U.S. agency obligations consisted solely of U.S. Government Agency securities with an amortized cost of $136.9 million and a fair value of $136.5 million. Mortgage-backed securities-residential consisted of U.S. Government Agency securities with an amortized cost of $31.5 million and a fair value of $32.2 million and GSE securities with an amortized cost of $139.8 million and a fair value of $143.6 million. In the held-to-maturity category at December 31, 2013, mortgage-backed securities-residential consisted of U.S. Government Agency securities with an amortized cost of $4.9 million and a fair value of $4.7 million and GSE securities with an amortized cost of $95.2 million and a fair value of $94.2 million.
In the available-for-sale category at December 31, 2012, U.S. agency obligations consisted solely of U.S. Government Agency securities with an amortized cost of $122.3 million and a fair value of $122.5 million. Mortgage-backed securities-residential consisted of U.S. Government Agency securities with an amortized cost of $36.4 million and a fair value of $37.8 million and GSE securities with an amortized cost of $216.1 million and a fair value of $224.0 million. In the held-to-maturity category at December 31, 2012, mortgage-backed securities-residential consisted of GSEs with an amortized cost of $55.4 million and a fair value of $56.1 million.
Securities in a continuous loss position, in the tables above for December 31, 2013 and December 31, 2012 do not reflect any deterioration of the credit worthiness of the issuing entities.  U.S. agency issues, including mortgage-backed securities, are all rated Aaa by Moody's and AA+ by Standard and Poor's.  The state and municipal obligations are general obligations supported by the general taxing authority of the issuer, and in some cases are insured.  Obligations issued by school districts are supported by state aid.  For any non-rated municipal securities, credit analysis is performed in-house based upon data that has been submitted by the issuers to the NY State Comptroller. That analysis shows no deterioration in the credit worthiness of the municipalities.  Subsequent to December 31, 2013, there were no securities downgraded below investment grade.
The unrealized losses on these temporarily impaired securities are primarily the result of changes in interest rates for fixed rate securities where the interest rate received is less than the current rate available for new offerings of similar securities, changes in market spreads as a result of shifts in supply and demand, and/or changes in the level of prepayments for mortgage related securities. Because we do not currently intend to sell any of our temporarily impaired securities, and because it is not more likely-than-not we would be required to sell the securities prior to recovery, the impairment is considered temporary.
Schedule of Federal Reserve Bank and Federal Home Loan Bank Stock
Federal Reserve Bank and Federal Home Loan Bank Stock are carried at cost.
	December 31,
	2013			2012
Federal Reserve Bank Stock	$	1,035		$	1,018
Federal Home Loan Bank Stock	5,246			4,774
Total Federal Reserve Bank and Federal Home Loan Bank Stock	$	6,281		$	5,792

Loans

Loans	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable Disclosure [Abstract]	'
Financing Receivables [Text Block]	'
	LOANS (Dollars In Thousands)
	Loan Categories and Past Due Loans
	The following table presents loan balances outstanding as of December 31, 2013 and December 31, 2012 and an analysis of the recorded investment in loans that are past due at these dates.  Generally, Arrow considers a loan past due 30 or more days if the borrower is two or more payments past due.
	Schedule of Past Due Loans by Loan Category
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
	December 31, 2013
	Loans Past Due 30-59 Days	$	304		$	—		$	200		$	37		$	3,233		$	529		$	4,303
	Loans Past Due 60-89 Days	601			—			1,200			19			1,041			1,527			4,388
	Loans Past Due 90 or More Days	177			—			2,034			—			98			3,113			5,422
	Total Loans Past Due	1,082			—			3,434			56			4,372			5,169			14,113
	Current Loans	86,811			27,815			284,685			7,593			389,832			455,623			1,252,359
	Total Loans	$	87,893		$	27,815		$	288,119		$	7,649		$	394,204		$	460,792		$	1,266,472
	Loans 90 or More Days Past Due and Still Accruing Interest	$	28		$	—		$	—		$	—		$	—		$	624		$	652
	Nonaccrual Loans	$	352		$	—		$	2,048		$	—		$	219		$	3,860		$	6,479
	December 31, 2012
	Loans Past Due 30-59 Days	$	1,045		$	—		$	534		$	43		$	2,427		$	407		$	4,456
	Loans Past Due 60-89 Days	1,588			—			1,332			17			793			2,466			6,196
	Loans Past Due 90 or more Days	494			—			1,871			—			185			1,462			4,012
	Total Loans Past Due	3,127			—			3,737			60			3,405			4,335			14,664
	Current Loans	102,409			29,149			241,440			6,624			345,695			432,360			1,157,677
	Total Loans	$	105,536		$	29,149		$	245,177		$	6,684		$	349,100		$	436,695		$	1,172,341
	Loans 90 or More Days Past Due and Still Accruing Interest	$	126		$	—		$	378		$	—		$	42		$	374		$	920
	Nonaccrual Loans	$	1,787		$	—		$	2,026		$	1		$	419		$	2,400		$	6,633
	The Company disaggregates its loan portfolio into the following six categories:
	Commercial - The Company offers a variety of loan options to meet the specific needs of our commercial customers including term loans, time notes and lines of credit. Such loans are made available to businesses for working capital needs such as inventory and receivables, business expansion and equipment purchases. Generally, a collateral lien is placed on equipment or other assets owned by the borrower. These loans carry a higher risk than commercial real estate loans due to the nature of the underlying collateral, which can be business assets such as equipment and accounts receivable and generally have a lower liquidation value than real estate. In the event of default by the borrower, the Company may be required to liquidate collateral at deeply discounted values. To reduce the risk, management usually obtains personal guarantees of the borrowers.
	Commercial Construction - The Company offers commercial construction and land development loans to finance projects within the communities that we serve. Many projects will ultimately be used by the borrowers’ businesses, while others are developed for resale. These real estate loans are secured by first liens on the real estate, which may include apartments, commercial structures, housing businesses, healthcare facilities, and both owner-occupied and nonowner-occupied facilities. There is enhanced risk during the construction period, since the loan is secured by an incomplete project.
	Commercial Real Estate - The Company offers commercial real estate loans to finance real estate purchases, refinancings, expansions and improvements to commercial properties. Commercial real estate loans are made to finance the purchases of real property which generally consists of real estate with completed structures. These commercial real estate loans are secured by first liens on the real estate, which may include apartments, commercial structures, housing businesses, healthcare facilities, and both owner and non owner-occupied facilities. These loans are typically less risky than commercial loans, since they are secured by real estate and buildings, and are generally originated in amounts of no more than 80% of the appraised value of the property.
	Other Consumer Loans - The Company offers a variety of consumer installment loans to finance personal expenditures. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from one to five years, based upon the nature of the collateral and the size of the loan. In addition to installment loans, the Company also offers personal lines of credit and overdraft protection. Several loans are unsecured, which carry a higher risk of loss.
	Automobile - The Company primarily finances the purchases of automobiles indirectly through dealer relationships located throughout upstate New York and Vermont. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from three to seven years. The majority of indirect consumer loans are underwritten on a secured basis using the underlying collateral being financed.
	Residential Real Estate Mortgages - Residential real estate loans consist primarily of loans secured by first or second mortgages on primary residences. We originate adjustable-rate and fixed-rate one-to-four-family residential real estate loans for the construction, purchase or refinancing of a mortgage. These loans are collateralized primarily by owner-occupied properties generally located in the Company’s market area. Loans on one-to-four-family residential real estate are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower), or have private mortgage insurance. The Company’s underwriting analysis for residential mortgage loans typically includes credit verification, independent appraisals, and a review of the borrower’s financial condition. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk, because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. In addition, the Company offers fixed home equity loans as well as home equity lines of credit to consumers to finance home improvements, debt consolidation, education and other uses.  Our policy allows for a maximum loan to value ratio of 80%.  The Company originates home equity lines of credit and second mortgage loans (loans secured by a second junior lien position on one-to-four-family residential real estate).  Risk is generally reduced through underwriting criteria, which include credit verification, appraisals, a review of the borrower's financial condition and personal cash flows.  A security interest, with title insurance when necessary, is taken in the underlying real estate.
	Allowance for Loan Losses
	The following table presents a rollforward of the allowance for loan losses and other information pertaining to the allowance for loan losses:
	Allowance for Loan Losses
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Unallocated			Total
	Rollfoward of the Allowance for Loan Losses for the Year Ended:
	31-Dec-12	$	2,344		$	601		$	3,050		$	304		$	4,536		$	3,405		$	1,058		$	15,298
	Charge-offs	(926		)	—			(11		)	(28		)	(431		)	(15		)	—			(1,411		)
	Recoveries	88			—			—			3			256			—			—			347
	Provision	380			(184		)	506			(7		)	(155		)	(364		)	24			200
	31-Dec-13	$	1,886		$	417		$	3,545		$	272		$	4,206		$	3,026		$	1,082		$	14,434
	31-Dec-11	$	1,927		$	602		$	3,136		$	350		$	4,496		$	3,414		$	1,078		$	15,003
	Charge-offs	(90		)	—			(206		)	(52		)	(401		)	(33		)	—			(782		)
	Recoveries	23			—			—			9			200			—			—			232
	Provision	484			(1		)	120			(3		)	241			24			(20		)	845
	December 31, 2012	$	2,344		$	601		$	3,050		$	304		$	4,536		$	3,405		$	1,058		$	15,298
	31-Dec-10	$	2,037		$	135		$	2,993		$	328		$	4,760		$	3,163		$	1,273		$	14,689
	Charge-offs	(105		)	—			—			(42		)	(480		)	(147		)	—			(774		)
	Recoveries	17			—			—			28			198			—			—			243
	Provision	(22		)	467			143			36			18			398			(195		)	845
	31-Dec-11	$	1,927		$	602		$	3,136		$	350		$	4,496		$	3,414		$	1,078		$	15,003
	Allowance for Loan Losses
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Unallocated			Total
	31-Dec-13
	Allowance for loan losses - Loans Individually Evaluated for Impairment	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	Allowance for loan losses - Loans Collectively Evaluated for Impairment	$	1,886		$	417		$	3,545		$	272		$	4,206		$	3,026		$	1,082		$	14,434
	Ending Loan Balance - Individually Evaluated for Impairment	$	221		$	—		$	1,785		$	—		$	173		$	2,309		$	—		$	4,488
	Ending Loan Balance - Collectively Evaluated for Impairment	$	87,672		$	27,815		$	286,334		$	7,649		$	394,031		$	458,483		$	—		$	1,261,984
	December 31, 2012
	Allowance for loan losses - Loans Individually Evaluated for Impairment	$	853		$	—		$	—		$	—		$	—		$	—		$	—		$	853
	Allowance for loan losses - Loans Collectively Evaluated for Impairment	$	1,491		$	601		$	3,050		$	304		$	4,536		$	3,405		$	1,058		$	14,445
Ending Loan Balance - Individually Evaluated for Impairment	$	1,432		$	—		$	2,528		$	—		$	203		$	1,090		$	—		$	5,253
Ending Loan Balance - Collectively Evaluated for Impairment	$	104,104		$	29,149		$	242,649		$	6,684		$	348,897		$	435,605		$	—		$	1,167,088
Through the provision for loan losses, an allowance for loan losses is maintained that reflects our best estimate of the inherent risk of loss in the Company’s loan portfolio as of the balance sheet date. Additions are made to the allowance for loan losses through a periodic provision for loan losses. Actual loan losses are charged against the allowance for loan losses when loans are deemed uncollectible and recoveries of amounts previously charged off are recorded as credits to the allowance for loan losses.
Our loan officers and risk managers meet at least quarterly to discuss and review the conditions and risks associated with certain criticized and classified commercial-related relationships. In addition, our independent internal loan review department performs periodic reviews of the credit quality indicators on individual loans in our commercial loan portfolio.
We use a two-step process to determine the provision for loan losses and the amount of the allowance for loan losses. We measure impairment on our impaired loans on a quarterly basis. Our impaired loans are generally nonaccrual loans over $250 thousand and all troubled debt restructured loans. Our impaired loans are generally considered to be collateral dependent with the specific reserve, if any, determined based on the value of the collateral less estimated costs to sell.
The remainder of the portfolio is evaluated on a pooled basis, as described below. For each homogeneous loan pool, we estimate a total loss factor based on the historical net loss rates adjusted for applicable qualitative factors. We update the total loss factors assigned to each loan category on a quarterly basis. For the commercial, commercial construction, and commercial real estate categories, we further segregate the loan categories by credit risk profile (pools of loans graded pass, special mention and accruing substandard). Additional description of the credit risk classifications is detailed in the Credit Quality Indicators section of this note.
We determine the historical net loss rate for each loan category using a trailing three-year net charge-off average. While historical net loss experience provides a reasonable starting point for our analysis, historical net losses, or even recent trends in net losses, do not by themselves form a sufficient basis to determine the appropriate level of the allowance for loan losses. Therefore, we also consider and adjust historical net loss factors for qualitative factors that impact the inherent risk of loss associated with our loan categories within our total loan portfolio. These include:
•	Changes in the volume and severity of past due, nonaccrual and adversely classified loans
•	Changes in the nature and volume of the portfolio and in the terms of loans
•	Changes in the value of the underlying collateral for collateral dependent loans
•	Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere in estimating credit losses
•	Changes in the quality of the loan review system
•	Changes in the experience, ability, and depth of lending management and other relevant staff
•	Changes in international, national, regional, and local economic and business conditions and developments that affect the collectibility of the portfolio
•	The existence and effect of any concentrations of credit, and changes in the level of such concentrations
•	The effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in the existing portfolio or pool
While not a significant part of the allowance for loan losses methodology, we also maintain an unallocated portion of the total allowance for loan losses related to the overall level of imprecision inherent in the estimation of the appropriate level of allowance for loan losses.
Loan Credit Quality Indicators
The following table presents the credit quality indicators by loan category at December 31, 2013 and December 31, 2012:
Loan Credit Quality Indicators
				Commercial			Commercial			Other
	Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
December 31, 2013
Credit Risk Profile by Creditworthiness Category:
Satisfactory	$	79,966		$	27,815		$	267,612											$	375,393
Special Mention	204			—			634												838
Substandard	7,723			—			19,873												27,596
Doubtful	—			—			—												—
Credit Risk Profile Based on Payment Activity:
Performing										$	7,649		$	393,985		$	456,308		857,942
Nonperforming										—			219			4,484			4,703
December 31, 2012
Credit Risk Profile by Creditworthiness Category:
Satisfactory	$	97,085		$	27,913		$	225,312											$	350,310
Special Mention	192			—			1,419												1,611
Substandard	6,872			1,236			18,446												26,554
Doubtful	1,387			—			—												1,387
Credit Risk Profile Based on Payment Activity:
Performing										$	6,683		$	348,676		$	433,922		$	789,281
Nonperforming										1			424			2,773			3,198
For the purposes of the table above, nonperforming automobile, residential and other consumer loans are those loans on nonaccrual status or are 90 days or more past due and still accruing interest.
For the allowance calculation, we use an internally developed system of five credit quality indicators to rate the credit worthiness of each commercial loan defined as follows:
1) Satisfactory - "Satisfactory" borrowers have acceptable financial condition with satisfactory record of earnings and sufficient historical and projected cash flow to service the debt.  Borrowers have satisfactory repayment histories and primary and secondary sources of repayment can be clearly identified;
2) Special Mention - Loans in this category have potential weaknesses that deserve management’s close attention.  If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date.  "Special mention" assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification.  Loans which might be assigned this credit quality indicator include loans to borrowers with deteriorating financial strength and/or earnings record and loans with potential for problems due to weakening economic or market conditions;
3) Substandard - Loans classified as “substandard” are inadequately protected by the current sound net worth or paying capacity of the borrower or the collateral pledged, if any.  Loans in this category have well defined weaknesses that jeopardize the repayment.  They are characterized by the distinct possibility that the bank will sustain some loss if the deficiencies are not corrected.  “Substandard” loans may include loans which are likely to require liquidation of collateral to effect repayment, and other loans where character or ability to repay has become suspect. Loss potential, while existing in the aggregate amount of substandard assets, does not have to exist in individual assets classified substandard;
4) Doubtful - Loans classified as “doubtful” have all of the weaknesses inherent in those classified as “substandard” with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of current existing facts, conditions, and values highly questionable and improbable.  Although possibility of loss is extremely high, classification of these loans as “loss” has been deferred due to specific pending factors or events which may strengthen the value (i.e. possibility of additional collateral, injection of capital, collateral liquidation, debt restructure, economic recovery, etc).  Loans classified as “doubtful” need to be placed on non-accrual; and
5) Loss - Loans classified as “loss” are considered uncollectible and of such little value that their continuance as bankable assets is not warranted.  As of the date of the balance sheet, all loans in this category have been charged-off to the allowance for loan losses.
Commercial loans are generally evaluated on an annual basis depending on the size and complexity of the loan relationship, unless the credit related quality indicator falls to a level of "special mention" or below, when the loan is evaluated quarterly.  The credit quality indicator is one of the factors used in assessing the level of inherent risk of loss in our commercial related loan portfolios.
Impaired Loans
The following table presents information on impaired loans based on whether the impaired loan has a recorded allowance or no recorded allowance:
Impaired Loans
				Commercial			Commercial			Other
	Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
December 31, 2013
Recorded Investment:
With No Related Allowance	$	221		$	—		$	1,785		$	—		$	173		$	2,309		$	4,488
With a Related Allowance	—			—			—			—			—			—			—
Unpaid Principal Balance:
With No Related Allowance	$	221		$	—		$	1,785		$	—		$	173		$	2,309		$	4,488
With a Related Allowance	—			—			—			—			—			—			—
December 31, 2012
Recorded Investment:
With No Related Allowance	$	45		$	—		$	2,528		$	—		$	203		$	1,090		$	3,866
With a Related Allowance	1,387			—			—			—			—			—			$	1,387
Unpaid Principal Balance:
With No Related Allowance	$	45		$	—		$	2,695		$	—		$	203		$	1,090		$	4,033
With a Related Allowance	1,387			—			—			—			—			—			$	1,387
For the Year-To-Date Period Ended:
December 31, 2013
Average Recorded Balance:
With No Related Allowance	$	133		$	—		$	2,157		$	—		$	188		$	1,700		$	4,178
With a Related Allowance	694			—			—			—			—			—			694
Interest Income Recognized:
With No Related Allowance	$	4		$	—		$	—		$	—		$	9		$	8		$	21
With a Related Allowance	—			—			—			—			—			—			—
Cash Basis Income:
With No Related Allowance	$	—		$	—		$	—		$	—		$	—		$	—		$	—
With a Related Allowance	—			—			—			—			—			—			—
December 31, 2012
Average Recorded Balance:
With No Related Allowance	$	56		$	—		$	2,241		$	—		$	236		$	1,599		$	4,132
With a Related Allowance	694			—			—			—			—			—			$	694
Interest Income Recognized:
With No Related Allowance	$	6		$	—		$	64		$	—		$	12		$	9		$	91
With a Related Allowance	—			—			—			—			—			—			$	—
Cash Basis Income:
With No Related Allowance	$	—		$	—		$	64		$	—		$	—		$	—		$	64
With a Related Allowance	—			—			—			—			—			—			$	—
December 31, 2011
Average Recorded Balance:
With No Related Allowance	$	40		$	—		$	1,993		$	5		$	274		$	1,328		$	3,640
Interest Income Recognized:
With No Related Allowance	$	6		$	—		$	42		$	—		$	19		$	7		$	74
Cash Basis Income:
With No Related Allowance	$	—		$	—		$	42		$	—		$	—		$	—		$	42
At December 31, 2013 and December 31, 2012, all impaired loans were considered to be collateral dependent and were therefore evaluated for impairment based on the fair value of collateral less estimated cost to sell. There was no allowance for loan losses allocated to impaired loans at December 31, 2013. Interest income recognized in the table above, represents income earned after the loans became impaired and includes restructured loans in compliance with their modified terms and nonaccrual loans where we have recognized interest income on a cash basis.
Loans Modified in Trouble Debt Restructurings
The following table presents information on loans modified in trouble debt restructurings during the periods indicated:
Loans Modified in Trouble Debt Restructurings During the Period
				Commercial			Commercial			Other
	Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
For the Year Ended:
December 31, 2013
Number of Loans	1			—			—			—			9			—			10
Pre-Modification Outstanding Recorded Investment	$	169		$	—		$	—		$	—		$	88		$	—		$	257
Post-Modification Outstanding Recorded Investment	$	200		$	—		$	—		$	—		$	88		$	—		$	288
Subsequent Default, Number of Contracts	—			—			—			—			—			—			—
Subsequent Default, Recorded Investment	—			—			—			—			—			—			—
Commitments to lend additional funds to modified loans	—			—			—			—			—			—			—
December 31, 2012
Number of Loans	—			—			2			—			17			—			19
Pre-Modification Outstanding Recorded Investment	$	—		$	—		$	47		$	—		$	160		$	—		$	207
Post-Modification Outstanding Recorded Investment	$	—		$	—		$	47		$	—		$	160		$	—		$	207
Subsequent Default, Number of Contracts	—			—			—			—			—			—			—
Subsequent Default, Recorded Investment	—			—			—			—			—			—			—
Commitments to lend additional funds to modified loans	—			—			—			—			—			—			—
December 31, 2011
Number of Loans	1			—			1			—			14			1			17
Pre-Modification Outstanding Recorded Investment	$	63		$	—		$	917		$	—		$	121		$	242		$	1,343
Post-Modification Outstanding Recorded Investment	$	63		$	—		$	917		$	—		$	121		$	242		$	1,343
Subsequent Default, Number of Contracts	—			—			—			—			—			—			—
Subsequent Default, Recorded Investment	—			—			—			—			—			—			—
Commitments to lend additional funds to modified loans	—			—			—			—			—			—			—
In general, loans requiring modification are restructured to accommodate the projected cash-flows of the borrower. Such modifications may involve a reduction of the interest rate, a significant deferral of payments or forgiveness of a portion of the outstanding principal balance. As indicated in the table above, no loans modified during the preceding twelve months subsequently defaulted as of December 31, 2013 or December 31, 2012.
Schedule of Supplemental Loan Information
	2013			2012
Supplemental Information:
Unamortized deferred loan origination costs, net of deferred loan	$	2,152		$	1,571
origination fees, included in the above balances
Overdrawn deposit accounts, included in the above balances	501			690
Pledged loans secured by one-to-four family residential mortgages	270,372			133,709
under a blanket collateral agreement to secure borrowings from
the Federal Home Loan Bank of New York
Residential real estate loans serviced for Freddie Mac, not included	156,593			134,688
in the balances above
Loans held for sale at period-end, included in the above balances	64			2,801
Loans to Related Parties:
Balance at beginning of year	$	17,447		$	15,772
Adjustment due to change in composition of related parties	(8,819		)	45
New loans and renewals, during the year	2,253			5,939
Repayments, during the year	(3,112		)	(4,309		)
Balance at end of year	$	7,769		$	17,447

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment, Other, Net [Abstract]	'
Property, Plant and Equipment Disclosure [Text Block]	'
	PREMISES AND EQUIPMENT (In Thousands)
	A summary of premises and equipment at December 31, 2013 and 2012 is presented below:
		2013			2012
	Land and Bank Premises	$	35,114		$	33,908
	Equipment, Furniture and Fixtures	20,851			20,123
	Leasehold Improvements	1,190			957
	Total Cost	57,155			54,988
	Accumulated Depreciation and Amortization	(28,001		)	(26,091		)
	Net Premises and Equipment	$	29,154		$	28,897
	Amounts charged to expense for depreciation totaled $1,928, $1,521 and $1,382 in 2013, 2012 and 2011, respectively.

Other_Intangible_Assets

Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Intangible Assets Disclosure [Text Block]	'
	OTHER INTANGIBLE ASSETS (In Thousands)
	The following table presents information on Arrow’s intangible assets (other than goodwill) as of December 31, 2013, 2012 and 2011:
		Depositor			Mortgage			Customer Intangibles1			Total
		Intangibles1			Servicing
					Rights2
	Gross Carrying Amount, December 31, 2013	$	2,247		$	1,582		$	4,451		$	8,280
	Accumulated Amortization	(2,186		)	(622		)	(1,332		)	(4,140		)
	Net Carrying Amount, December 31, 2013	$	61		$	960		$	3,119		$	4,140
	Gross Carrying Amount, December 31, 2012	$	2,247		$	1,251		$	4,451		$	7,949
	Accumulated Amortization	(2,094		)	(392		)	(971		)	(3,457		)
	Net Carrying Amount, December 31, 2012	$	153		$	859		$	3,480		$	4,492
	Rollforward of Intangible Assets:
	Balance, December 31, 2010	$	460		$	371		$	627		$	1,458
	Intangible Assets Acquired	—			339			3,573			3,912
	Amortization of Intangible Assets	(174		)	(111		)	(336		)	(621		)
	Balance, December 31, 2011	286			599			3,864			4,749
	Intangible Assets Acquired	—			417			—			417
	Amortization of Intangible Assets	(133		)	(157		)	(384		)	(674		)
	Balance, December 31, 2012	153			859			3,480			4,492
	Intangible Assets Acquired	—			331			—			331
	Amortization of Intangible Assets	(92		)	(230		)	(361		)	(683		)
	Balance, December 31, 2013	$	61		$	960		$	3,119		$	4,140
	1 Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense.
	2 Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.
	The following table presents the remaining estimated annual amortization expense for Arrow's intangible assets as of December 31, 2013:
		Depositor			Mortgage			Customer Intangibles1			Total
		Intangibles1			Servicing
					Rights2
	Estimated Annual Amortization Expense:
	2014	$	51		$	253		$	337		$	641
	2015	10			230			319			559
	2016	—			209			301			510
	2017	—			150			281			431
	2018	—			96			263			359
	Later Years	—			22			1,618			1,640
	Total	$	61		$	960		$	3,119		$	4,140
	1 Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense.
	2 Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.

Guarantees

Guarantees	12 Months Ended
	Dec. 31, 2013
Guarantees [Abstract]	'
Guarantees [Text Block]	'
	GUARANTEES (Dollars In Thousands)
	The following table presents the notional amount and fair value of Arrow's off-balance sheet commitments to extend credit and commitments under standby letters of credit as of December 31, 2013 and 2012:
	Balance at December 31,	2013		2012
	Notional Amount:
	Commitments to Extend Credit	$	237,940	$	198,405
	Standby Letters of Credit	3,345		10,929
	Fair Value:
	Commitments to Extend Credit	$	—	$	—
	Standby Letters of Credit	65		120
	Arrow is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers.  These financial instruments include commitments to extend credit and standby letters of credit.  Commitments to extend credit include home equity lines of credit, commitments for residential and commercial construction loans and other personal and commercial lines of credit.  Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets.  The contract or notional amounts of those instruments reflect the extent of the involvement Arrow has in particular classes of financial instruments.
	Arrow's exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual notional amount of those instruments.  Arrow uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments.
	Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract.  Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee.  Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.  Arrow evaluates each customer's creditworthiness on a case-by-case basis.  Home equity lines of credit are secured by residential real estate.  Construction lines of credit are secured by underlying real estate.  For other lines of credit, the amount of collateral obtained, if deemed necessary by Arrow upon extension of credit, is based on management's credit evaluation of the counterparty.  Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, and income-producing commercial properties.  Most of the commitments are variable rate instruments.
	Arrow does not issue any guarantees that would require liability-recognition or disclosure, other than its standby letters of credit.
	Arrow has issued conditional commitments in the form of standby letters of credit to guarantee payment on behalf of a customer and guarantee the performance of a customer to a third party.  Standby letters of credit generally arise in connection with lending relationships. The credit risk involved in issuing these instruments is essentially the same as that involved in extending loans to customers. Contingent obligations under standby letters of credit at December 31, 2013 and 2012 represent the maximum potential future payments Arrow could be required to make.  Typically, these instruments have terms of 12 months or less and expire unused; therefore, the total amounts do not necessarily represent future cash requirements.  Each customer is evaluated individually for creditworthiness under the same underwriting standards used for commitments to extend credit and on-balance sheet instruments.  Company policies governing loan collateral apply to standby letters of credit at the time of credit extension.  Loan-to-value ratios will generally range from 50% for movable assets, such as inventory, to 100% for liquid assets, such as bank CD's.  Fees for standby letters of credit range from 1% to 3% of the notional amount.  Fees are collected upfront and amortized over the life of the commitment. The carrying amount and fair value of Arrow's standby letters of credit at December 31, 2013 and 2012 were insignificant.  The fair value of standby letters of credit is based on the fees currently charged for similar agreements or the cost to terminate the arrangement with the counterparties.
	The fair value of commitments to extend credit is determined by estimating the fees to enter into similar agreements, taking into account the remaining terms and present creditworthiness of the counterparties, and for fixed rate loan commitments, the difference between the current and committed interest rates.  Arrow provides several types of commercial lines of credit and standby letters of credit to its commercial customers.  The pricing of these services is not isolated as Arrow considers the customer's complete deposit and borrowing relationship in pricing individual products and services.  The commitments to extend credit also include commitments under home equity lines of credit, for which Arrow charges no fee.  The carrying value and fair value of commitments to extend credit are not material and Arrow does not expect to incur any material loss as a result of these commitments.
	In the normal course of business, Arrow and its subsidiary banks become involved in a variety of routine legal proceedings.  At present, there are no legal proceedings pending or threatened, which in the opinion of management and counsel, would result in a material loss to Arrow.

Time_Deposits

Time Deposits	12 Months Ended
	Dec. 31, 2013
Time Deposits [Abstract]	'
Deposit Liabilities Disclosures [Text Block]	'
	TIME DEPOSITS (Dollars In Thousands)
	The following summarizes the contractual maturities of time deposits during years subsequent to December 31, 2013:
	Year of Maturity	Total Time
		Deposits
	2014	$	163,032
	2015	31,277
	2016	17,450
	2017	18,418
	2018	13,076
	2019 and Beyond	3,974
	Total	$	247,227

Debt

Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Debt [Text Block]	'
	DEBT (Dollars in Thousands)
	Schedule of Short-Term Borrowings:
		2013			2012
	Balances at December 31:
	Overnight Advances from the Federal Home Loan Bank of New York	$	53,000		$	29,000
	Securities Sold Under Agreements to Repurchase	11,777			12,678
	Total Short-Term Borrowings	$	64,777		$	41,678
	Maximum Borrowing Capacity at December 31:
	Federal Funds Purchased	$	30,000		$	30,000
	Overnight Advances from the Federal Home Loan Bank of New York	214,000			90,000
	Federal Reserve Bank of New York	302,000			268,000
	Securities sold under agreements to repurchase mature in one day.  Arrow maintains effective control over the securities underlying the agreements.
	Arrow's subsidiary banks have in place unsecured federal funds lines of credit with three correspondent banks. As a member of the FHLBNY, we participate in the advance program which allows for overnight and term advances up to the limit of pledged collateral, including FHLBNY stock, mortgage-backed securities and residential real estate loans (see Note 4. "Investment Securities" and Note 5. "Loans").  Our investment in FHLBNY stock is proportional to the total of our overnight and term advances (see the Schedule of Federal Reserve Bank and Federal Home Loan Bank Stock in Note 4. "Investment Securities"). Our bank subsidiaries have also established borrowing facilities with the Federal Reserve Bank of New York for potential “discount window” advances, pledging certain consumer loans as collateral (see Note 5. "Loans").
	Long Term Debt - FHLBNY Term Advances
	In addition to overnight advances, Arrow also borrows longer-term funds from the FHLBNY.  Certain borrowings are in the form of “convertible advances.”  These advances have a set final maturity, but are callable by the FHLBNY at certain dates beginning no earlier than one year from the issuance date.  If the advances are called, Arrow may elect to have the funds replaced by the FHLBNY at the then prevailing market rate of interest.
	Maturity Schedule of FHBLNY Term Advances:
			Balances					Weighted Average Rate
	Final Maturity		2013			2012		2013		2012
	First Year		$	10,000		$	10,000	1.43	%	1.65	%
	Second Year		10,000			10,000		3.88	%	1.43	%
	Third Year		—			10,000		—	%	3.88	%
	Total		$	20,000		$	30,000	2.66	%	2.32	%
	Long Term Debt - Guaranteed Preferred Beneficial Interests in Corporation's Junior Subordinated Debentures
	During 2013, there were outstanding two classes of financial instruments issued by two separate subsidiary business trusts of Arrow, identified as “Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts” on the Consolidated Balance Sheets and the Consolidated Statements of Income.
	The first of the two classes of trust-issued instruments outstanding at year-end was issued by Arrow Capital Statutory Trust II ("ACST II"), a Delaware business trust established on July 16, 2003, upon the filing of a certificate of trust with the Delaware Secretary of State.  In July 2003, ACST II issued all of its voting (common) stock to Arrow and issued and sold to an unaffiliated purchaser 30-year guaranteed preferred beneficial interests in the trust's assets ("ACST II trust preferred securities"). The rate on the securities is variable, adjusting quarterly to the 3-month LIBOR plus 3.15%.  ACST II used the proceeds of the sale of its trust preferred securities to purchase an identical amount of junior subordinated debentures issued by Arrow that bear an interest rate identical at all times to the rate payable on the ACST II trust preferred securities.  The ACST II trust preferred securities became redeemable after July 23, 2008 and mature on July 23, 2033.
	The second of the two classes of trust-issued instruments outstanding at year-end was issued by Arrow Capital Statutory Trust III ("ACST III"), a Delaware business trust established on December 23, 2004, upon the filing of a certificate of trust with the Delaware Secretary of State. On December 28, 2004, the ACST III issued all of its voting (common) stock to Arrow and issued and sold to an unaffiliated purchaser 30-year guaranteed preferred beneficial interests in the trust's assets ("ACST III").  The rate on the ACST III trust preferred securities is a variable rate, adjusted quarterly, equal to the 3-month LIBOR plus 2.00%.  ACST III used the proceeds of the sale of its trust preferred securities to purchase an identical amount of junior subordinated debentures issued by Arrow that bear an interest rate identical at all times to the rate payable on the ACST III trust preferred securities.  The ACST III trust preferred securities became redeemable on or after March 31, 2010 and mature on December 28, 2034.
	The primary assets of the two subsidiary trusts having trust preferred securities outstanding at year-end, ACST II and ACST III (the “Trusts”), are Arrow's junior subordinated debentures discussed above, and the sole revenues of the Trusts are payments received by them from Arrow with respect to the junior subordinated debentures.  The trust preferred securities issued by the Trusts are non-voting.  All common voting securities of the Trusts are owned by Arrow.  Arrow used the net proceeds from its sale of junior subordinated debentures to the Trusts, facilitated by the Trust’s sale of their trust preferred securities to the purchasers thereof, for general corporate purposes.  The trust preferred securities and underlying junior subordinated debentures, with associated expense that is tax deductible, qualify as Tier I capital under regulatory definitions.
	Arrow's primary source of funds to pay interest on the debentures that are held by the Trusts are current dividends received by Arrow from its subsidiary banks.  Accordingly, Arrow's ability to make payments on the debentures, and the ability of the Trusts to make payments on their trust preferred securities, are dependent upon the continuing ability of Arrow's subsidiary banks to pay dividends to Arrow.  Since the trust preferred securities issued by the subsidiary trusts and the underlying junior subordinated debentures issued by Arrow at December 31, 2013, 2012 and 2011 are classified as debt for financial statement purposes, the expense associated with these securities is recorded as interest expense in the consolidated statements of income for the three years.
	Schedule of Guaranteed Preferred Beneficial Interests in Corporation's Junior Subordinated Debentures
		2013			2012
	ACST II
	Balance at December 31,	$	10,000		$	10,000
	Period-End Interest Rate	3.4		%	3.51		%
	ACST III
	Balance at December 31,	$	10,000		$	10,000
	Period-End Interest Rate	2.25		%	2.36		%

Comprehensive_Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2013
Comprehensive Income [Abstract]	'
Other Comprehensive Income, Noncontrolling Interest [Text Block]	'
	COMPREHENSIVE INCOME (Dollars In Thousands)
	The following table presents the components of other comprehensive income for the years ended December 31, 2013, 2012 and 2011:
	Schedule of Comprehensive Income
		Before-Tax				Tax			Net-of-Tax
		Amount				(Expense)			Amount
						Benefit
	2013
	Net Unrealized Securities Holding Gains Arising During the Period	$	(4,843	)		$	1,918		$	(2,925	)
	Reclassification Adjustment for Securities Gains Included in Net Income	(540		)		214			(326		)
	Net Retirement Plan Loss	10,640				(4,215		)	6,425
	Amortization of Net Retirement Plan Actuarial Loss	1,513				(599		)	914
	Accretion of Net Retirement Plan Prior Service Credit	2				(1		)	1
	Other Comprehensive Income	$	6,772			$	(2,683	)	$	4,089
	2012
	Net Unrealized Securities Holding Gains Arising During the Period	$	(1,094	)		$	433		$	(661	)
	Reclassification Adjustment for Securities Gains Included in Net Income	(865		)		343			(522		)
	Net Retirement Plan Loss	(2,218		)		878			(1,340		)
	Net Retirement Plan Prior Service Credit	(405		)		160			(245		)
	Amortization of Net Retirement Plan Actuarial Loss	1,677				(664		)	1,013
	Accretion of Net Retirement Plan Prior Service Credit	(20		)		8			(12		)
	Other Comprehensive Income	$	(2,925	)		$	1,158		$	(1,767	)
	2011
	Net Unrealized Securities Holding Gains Arising During the Period	$	7,850			$	(3,109	)	$	4,741
	Reclassification Adjustment for Securities Gains Included in Net Income	(2,795		)		1,107			(1,688		)
	Net Retirement Plan Loss	(6,129		)		2,428			(3,701		)
	Net Retirement Plan Prior Service Credit	(266		)		105			(161		)
	Amortization of Net Retirement Plan Actuarial Loss	996				(394		)	602
	Accretion of Net Retirement Plan Prior Service Credit	(108		)		43			(65		)
	Other Comprehensive Income	$	(452	)		$	180		$	(272	)
	The following table presents the changes in accumulated other comprehensive income by component:
	Changes in Accumulated Other Comprehensive Income (Loss) by Component (1)
		Unrealized				Defined Benefit Plan Items
		Gains and
		Losses on							Net Prior
		Available-for-				Net Gain			Service
		Sale Securities				(Loss)			(Cost ) Credit			Total
	For the Year-To-Date periods ended:
	31-Dec-12	$	5,625			$	(14,036	)	$	(51	)	$	(8,462	)
	Other comprehensive income (loss) before reclassifications	(2,925		)		6,425			—			3,500
	Amounts reclassified from accumulated other comprehensive income (loss)	(326		)		914			1			589
	Net current-period other comprehensive income	(3,251		)		7,339			1			4,089
	December 31, 2013	$	2,374			$	(6,697	)	$	(50	)	$	(4,373	)
	December 31, 2011	$	6,808			$	(13,709	)	$	206		$	(6,695	)
	Other comprehensive income (loss) before reclassifications	(661		)		(1,340		)	(245		)	(2,246		)
	Amounts reclassified from accumulated other comprehensive income (loss)	(522		)		1,013			(12		)	479
	Net current-period other comprehensive income	(1,183		)		(327		)	(257		)	(1,767		)
	December 31, 2012	$	5,625			$	(14,036	)	$	(51	)	$	(8,462	)
	December 31, 2010	$	3,755			$	(10,610	)	$	432		$	(6,423	)
	Other comprehensive income (loss) before reclassifications	4,741				(3,701		)	(161		)	879
	Amounts reclassified from accumulated other comprehensive income (loss)	(1,688		)		602			(65		)	(1,151		)
	Net current-period other comprehensive income	3,053				(3,099		)	(226		)	(272		)
	December 31, 2011	$	6,808			$	(13,709	)	$	206		$	(6,695	)
	(1) All amounts are net of tax. Amounts in parentheses indicate debits.
	The following table presents the reclassifications out of accumulated other comprehensive income:
	Reclassifications Out of Accumulated Other Comprehensive Income (1)
			Amounts Reclassified
	Details about Accumulated Other		from Accumulated Other				Affected Line Item in the Statement
	Comprehensive Income Components		Comprehensive Income				Where Net Income Is Presented
	For the Year-to-date periods ended:
	December 31, 2013
	Unrealized gains and losses on available-for-sale securities
			$	540			Gain on Securities Transactions, Net
			540				Total before tax
		(214		)		Provision for Income Taxes
		$	326			Net of tax
Amortization of defined benefit pension items
Prior-service costs		$	(2	)	(2)	Salaries and Employee Benefits
Actuarial gains/(losses)		(1,513		)	(2)	Salaries and Employee Benefits
		(1,515		)		Total before tax
		600				Provision for Income Taxes
		$	(915	)		Net of tax
Total reclassifications for the period		$	(589	)		Net of tax
December 31, 2012
Unrealized gains and losses on available-for-sale securities
		$	865			Gain on Securities Transactions, Net
		865				Total before tax
		(343		)		Provision for Income Taxes
		$	522			Net of tax
Amortization of defined benefit pension items
Prior-service costs		20			(2)	Salaries and Employee Benefits
Actuarial gains/(losses)		$	(1,677	)	(2)	Salaries and Employee Benefits
		(1,657		)		Total before tax
		656				Provision for Income Taxes
		$	(1,001	)		Net of tax
Total reclassifications for the period		$	(479	)		Net of tax
Reclassifications Out of Accumulated Other Comprehensive Income (1)
		Amounts Reclassified
Details about Accumulated Other		from Accumulated Other				Affected Line Item in the Statement
Comprehensive Income Components		Comprehensive Income				Where Net Income Is Presented
December 31, 2011
Unrealized gains and losses on available-for-sale securities
		$	2,795			Gain on Securities Transactions, Net
		2,795				Total before tax
		(1,107		)		Provision for Income Taxes
		$	1,688			Net of tax
Amortization of defined benefit pension items
Prior-service costs		108			(2)	Salaries and Employee Benefits
Actuarial gains/(losses)		$	(996	)	(2)	Salaries and Employee Benefits
		(888		)		Total before tax
		351				Provision for Income Taxes
		$	(537	)		Net of tax
Total reclassifications for the period		$	1,151			Net of tax
(1) Amounts in parentheses indicate debits to profit/loss.
(2) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see pension footnote for additional details).

Stock_Based_Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	'
	STOCK BASED COMPENSATION (Dollars In Thousands, Except Share and Per Share Amounts)
	Arrow has established two stock based compensation plans: an Incentive and Non-qualified Stock Option Plan (Stock Option Plan) and an Employee Stock Ownership Plan (ESOP).  All share and per share data have been adjusted for the September 2013 2% stock dividend.
	Stock Option Plan
	Options may be granted at a price no less than the greater of the par value or fair market value of such shares on the date on which such option is granted, and generally expire ten years from the date of grant.  The options usually vest over a four-year period.
	Roll Forward Schedule of Stock Option Plan by Shares and Weighted Average Exercise Prices
		Stock Option Plans
	Roll Forward of Shares Outstanding:
	Outstanding at January 1, 2013	451,210
	Granted	10,200
	Exercised	(59,612		)
	Forfeited	(12,406		)
	Outstanding at December 31, 2013	389,392
	Exercisable at December 31, 2013	269,758
	Vested and Expected to Vest	119,634
	Roll Forward of Shares Outstanding - Weighted Average Exercise Price:
	Outstanding at January 1, 2013	$	22.67
	Granted	23.8
	Exercised	21.02
	Forfeited	24.71
	Outstanding at December 31, 2013	22.89
	Exercisable at December 31, 2013	22.29
	Vested and Expected to Vest	24.25
	Weighted Average Remaining Contractual Life (in years):
	Outstanding at December 31, 2013	5.57
	Exercisable at December 31, 2013	4.68
	Vested and Expected to Vest	7.58
	Aggregate Intrinsic Value:
	Outstanding at December 31, 2013	$	1,429
	Exercisable at December 31, 2013	1,152
	Vested and Expected to Vest	277
	Shares Available for Grant at Period-End	459,000
	Schedule of Shares Authorized Under the Stock Option Plan by Exercise Price Range
		Exercise Price Ranges
		$19.08 to $19.87			$21.24 to $22.27			$23.76 to $23.80		$24.43			$25.77		Total
	Outstanding Options at
	31-Dec-13
	Number of Shares Outstanding	85,278			98,376			83,015		75,512			47,211		389,392
	Weighted-Average Remaining Contractual Life (in years)	4.73			5.11			7.34		8.05			0.97		5.57
	Weighted-Average Exercise Price	$	19.64		$	21.95		$	23.77	$	24.43		$	25.77	$	22.89
	Exercisable Options at
	31-Dec-13
	Number of Shares Outstanding	85,278			81,150			36,391		19,728			47,211		269,758
	Weighted-Average Remaining Contractual Life (in years)	4.73			4.9			7.09		7.94			0.97		4.68
	Weighted-Average Exercise Price	$	19.64		$	21.88		$	23.77	$	24.42		$	25.77	$	22.29
	Schedule of Other Stock Option Plan Information
			2013				2012			2011
	Shares Granted		10,200				77,302			79,994
	Weighted Average Grant Date Information:
	Fair Value of Options Granted		$	5.46			$	5.89		$	6
	Fair Value Assumptions:
	Dividend Yield		4.2		%		3.93		%	4		%
	Expected Volatility		36.57		%		37.43		%	36.5		%
	Risk Free Interest Rate		1.31		%		1.22		%	2.54		%
	Expected Lives (in years)		6.71				6.46			6.4
	Amount Expensed During the Year		$	372			$	424		$	354
	Compensation Costs for Non-vested Awards Not Yet Recognized		420				737			705
	Weighted Average Expected Vesting Period, In Years		1.45				1.71			1.8
	Proceeds From Stock Options Exercised		$	1,254			$	2,105		$	1,413
	Tax Benefits Related to Stock Options Exercised		23				68			51
	Intrinsic Value of Stock Options Exercised		267				2,434			1,740
	Employee Stock Ownership Plan
	Arrow maintains an employee stock ownership plan (“ESOP”).  Substantially all employees of Arrow and its subsidiaries are eligible to participate upon satisfaction of applicable service requirements.  The ESOP borrowed funds from one of Arrow’s subsidiary banks to purchase outstanding shares of Arrow’s common stock.  The notes require annual payments of principal and interest through 2018.  As the debt is repaid, shares are released from collateral based on the proportion of debt paid to total debt outstanding for the year and allocated to active employees.  In addition, the Company makes additional cash contributions to the Plan each year.
	Schedule of ESOP Compensation Expense
		2013				2012			2011
ESOP Compensation Expense		$	600			$	550		$	550
As the debt is repaid, shares are released from collateral based on the proportion of debt paid to total debt outstanding for the year and allocated to active employees.
Shares pledged as collateral are reported as unallocated ESOP shares in stockholders’ equity.  As shares are released from collateral, Arrow reports compensation expense equal to the current average market price of the shares, and the shares become outstanding for earnings per share computations.  The ESOP shares as of December 31, 2013 were as follows:
Schedule of Shares in ESOP Plan
ESOP Plan Shares:	2013
Allocated Shares	644,248
Shares Released for Allocation During 2013	16,969
Unallocated Shares	87,641
Total ESOP Shares	748,858
Market Value of Unallocated Shares	$	2,328

Retirement_Benefit_Plans

Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Pension and Other Postretirement Benefits Disclosure [Text Block]	'
	RETIREMENT BENEFIT PLANS (Dollars in Thousands)
	Arrow sponsors qualified and nonqualified defined benefit pension plans and other postretirement benefit plans for its employees. Arrow maintains a non-contributory pension plan, which covers substantially all employees.  Effective December 1, 2002, all active participants in the qualified defined benefit pension plan were given a one-time irrevocable election to continue participating in the traditional plan design, for which benefits were based on years of service and the participant’s final compensation (as defined), or to begin participating in the new cash balance plan design.  All employees who participate in the plan after December 1, 2002 automatically participate in the cash balance plan design.  The interest credits under the cash balance plan are based on the 30-year U.S. Treasury rate in effect for November of the prior year.  The service credits under the cash balance plan are equal to 6.0% of eligible salaries for employees who become participants on or after January 1, 2003.  For employees in the plan prior to January 1, 2003, the service credits are scaled based on the age of the participant, and range from 6.0% to 12.0%.  The funding policy is to contribute up to the maximum amount that can be deducted for federal income tax purposes and to make all payments required under ERISA.  Arrow also maintains a supplemental non-qualified unfunded retirement plan to provide eligible employees of Arrow and its subsidiaries with benefits in excess of qualified plan limits imposed by federal tax law.
	Arrow has multiple non-pension postretirement benefit plans.  The health care, dental and life insurance plans are contributory, with participants’ contributions adjusted annually.  Arrow’s policy is to fund the cost of postretirement benefits based on the current cost of the underlying policies.  However, the health care plan provision for automatic increases of Company contributions each year is based on the increase in inflation and is limited to a maximum of 5%.
	The following tables set forth changes in the plans’ benefit obligations (projected benefit obligation for pension benefits and accumulated benefit obligation for postretirement benefits) and changes in the plans’ assets and the funded status of the pension plans and other postretirement benefit plan at December 31:
	Schedule of Defined Benefit Plan Disclosures
		Employees'			Select			Postretirement
		Pension			Executive			Benefit
		Plan			Retirement			Plans
					Plan
	Defined Benefit Plan Funded Status
	31-Dec-13
	Fair Value of Plan Assets	$	44,653		$	—		$	—
	Benefit Obligation	33,259			4,459			7,619
	Funded Status of Plan	$	11,394		$	(4,459	)	$	(7,619	)
	31-Dec-12
	Fair Value of Plan Assets	$	39,880		$	—		$	—
	Benefit Obligation	37,046			5,324			9,213
	Funded Status of Plan	$	2,834		$	(5,324	)	$	(9,213	)
	Change in Benefit Obligation
	Benefit Obligation, at January 1, 2013	$	37,046		$	5,324		$	9,213
	Service Cost	1,506			—			211
	Interest Cost	1,261			163			308
	Plan Participants' Contributions	—			—			368
	Amendments	—			—			—
	Actuarial Gain	(3,820		)	(555		)	(1,648		)
	Benefits Paid	(2,734		)	(473		)	(833		)
	Benefit Obligation, at December 31, 2013	$	33,259		$	4,459		$	7,619
	Schedule of Defined Benefit Plan Disclosures
		Employees'			Select			Postretirement
		Pension			Executive			Benefit
		Plan			Retirement			Plans
					Plan
	Benefit Obligation, at January 1, 2012	$	35,047		$	4,529		$	8,556
	Service Cost	1,467			87			202
	Interest Cost	1,436			190			338
	Plan Participants' Contributions	—			—			348
	Amendments	—			405			—
	Actuarial Loss	2,857			441			491
	Benefits Paid	(3,761		)	(328		)	(722		)
	Benefit Obligation, at December 31, 2012	$	37,046		$	5,324		$	9,213
	Change in Fair Value of Plan Assets
	Fair Value of Plan Assets, at January 1, 2013	$	39,880		$	—		$	—
	Actual Return on Plan Assets	7,507			—			—
	Employer Contributions	—			473			465
	Plan Participants' Contributions	—			—			368
	Benefits Paid	(2,734		)	(473		)	(833		)
	Fair Value of Plan Assets, at December 31, 2013	$	44,653		$	—		$	—
	Change in Fair Value of Plan Assets, continued
	Fair Value of Plan Assets, at January 1, 2012	$	39,206		$	—		$	—
	Actual Return on Plan Assets	4,435			—			—
	Employer Contributions	—			328			374
	Plan Participants' Contributions	—			—			348
	Benefits Paid	(3,761		)	(328		)	(722		)
	Fair Value of Plan Assets, at December 31, 2012	$	39,880		$	—		$	—
	Accumulated Benefit Obligation at December 31, 2013	$	32,886		$	4,459		$	7,619
	Amounts Recognized in the Consolidated Balance Sheets
	31-Dec-13
	Prepaid Pension Asset	$	11,394		$	—		—
	Accrued Benefit Liability	—			(4,459		)	(7,619		)
	Net Benefit Recognized	$	11,394		$	(4,459	)	$	(7,619	)
	31-Dec-12
	Prepaid Pension Asset	$	2,834		$	—		—
	Accrued Benefit Liability	—			(5,324		)	(9,213		)
Net Benefit Recognized	$	2,834		$	(5,324	)	$	(9,213	)
Amounts Recognized in Other Comprehensive Income (Loss)
For the Year Ended December 31, 2013
Net Unamortized Gain Arising During the Period	$	(8,438	)	$	(554	)	$	(1,648	)
Net Prior Service Cost Arising During the Period	—			—			—
Amortization of Net Loss	(1,231		)	(140		)	(142		)
Amortization of Prior Service (Cost) Credit	(37		)	(79		)	114
Total Other Comprehensive (Loss) Income for Pension and	$	(9,706	)	$	(773	)	$	(1,676	)
Other Postretirement Benefit Plans
For the Year Ended December 31, 2012
Net Unamortized Loss Arising During the Period	$	1,286		$	441		$	491
Net Prior Service Cost Arising During the Period	—			405			—
Amortization of Net Loss	(1,387		)	(156		)	(134		)
Amortization of Prior Service (Cost) Credit	(41		)	(53		)	114
Total Other Comprehensive (Loss) Income for Pension and	$	(142	)	$	637		$	471
Other Postretirement Benefit Plans
Schedule of Defined Benefit Plan Disclosures
	Employees'			Select			Postretirement
	Pension			Executive			Benefit
	Plan			Retirement			Plans
				Plan
For the Year Ended December 31, 2011
Net Unamortized Loss Arising During the Period	$	5,474		$	151		$	504
Net Prior Service Cost Arising During the Period	191			75			—
Amortization of Net Loss	(778		)	(147		)	(71		)
Amortization of Prior Service (Cost) Credit	(38		)	32			114
Total Other Comprehensive (Loss) Income for Pension and	$	4,849		$	111		$	547
Other Postretirement Benefit Plans
Accumulated Other Comprehensive Income
31-Dec-13
Net Actuarial Loss	$	8,357		$	1,674		$	1,060
Prior Service (Credit) Cost	(255		)	642			(305		)
Total Accumulated Other Comprehensive Income, Before Tax	$	8,102		$	2,316		$	755
31-Dec-12
Net Actuarial Loss	$	18,026		$	2,368		$	2,850
Prior Service (Credit) Cost	(218		)	721			(419		)
Total Accumulated Other Comprehensive Income, Before Tax	$	17,808		$	3,089		$	2,431
Amounts that will be Amortized from Accumulated
Other Comprehensive Income the Next Year
Net Actuarial Loss	$	345		$	90		$	26
Prior Service (Credit) Cost	$	(45	)	$	72		$	(114	)
Net Periodic Benefit Cost
For the Year Ended December 31, 2013
Service Cost	$	1,506		$	—		$	211
Interest Cost	1,261			163			308
Expected Return on Plan Assets	(2,889		)	—			—
Amortization of Prior Service (Credit) Cost	37			79			(114		)
Amortization of Net Loss	1,232			139			142
Net Periodic Benefit Cost	$	1,147		$	381		$	547
For the Year Ended December 31, 2012
Service Cost	$	1,467		$	87		$	202
Interest Cost	1,436			190			338
Expected Return on Plan Assets	(2,865		)	—			—
Amortization of Prior Service (Credit) Cost	41			53			(114		)
Amortization of Net Loss	1,387			156			134
Net Periodic Benefit Cost	$	1,466		$	486		$	560
For the Year Ended December 31, 2011
Service Cost	$	1,353		$	81		$	173
Interest Cost	1,598			222			372
Expected Return on Plan Assets	(2,793		)	—			—
Amortization of Prior Service (Credit) Cost	38			(32		)	(114		)
Amortization of Net Loss	778			147			71
Net Periodic Benefit Cost	$	974		$	418		$	502
Weighted-Average Assumptions Used in
Calculating Benefit Obligation
31-Dec-13
Discount Rate	5.1		%	4.85		%	5.1		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Schedule of Defined Benefit Plan Disclosures
	Employees'			Select			Postretirement
	Pension			Executive			Benefit
	Plan			Retirement			Plans
				Plan
Interest Rate Credit for Determining	4		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	5.25		%
Balance Account
Interest Rate to Convert Annuities To Actuarially	5.25		%	5.25		%
Equivalent Lump Sum Amounts
31-Dec-12
Discount Rate	3.55		%	3.15		%	3.55		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	3		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	4.5		%
Balance Account
Interest Rate to Convert Annuities To Actuarially	4.5		%	4.5		%
Equivalent Lump Sum Amounts
Weighted-Average Assumptions Used in
Calculating Net Periodic Benefit Cost
31-Dec-13
Discount Rate	3.55		%	3.15		%	3.55		%
Expected Long-Term Return on Plan Assets	7.5		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	3		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	4.5		%
Balance Account
Interest Rate to Convert AnnuitiesTo Actuarially	4.5		%	4.5		%
Equivalent Lump Sum Amounts
31-Dec-12
Discount Rate	4.05		%	4.05		%	4.05		%
Expected Long-Term Return on Plan Assets	7.5		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	3.25		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	5		%
Balance Account
Interest Rate to Convert AnnuitiesTo Actuarially	5		%	5		%
Equivalent Lump Sum Amounts
31-Dec-11
Discount Rate	5.15		%	5.15		%	5.15		%
Expected Long-Term Return on Plan Assets	7.5		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	4.25		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	5.5		%
Balance Account
Interest Rate to Convert AnnuitiesTo Actuarially	5.5		%	5.5		%
Equivalent Lump Sum Amounts
Schedule of Defined Benefit Plan Disclosures
Information about Defined Benefit Plan Assets - Employees' Pension Plan
	Fair Value Measurements Using:
Asset Category	Quoted Prices			Significant Other Observable Inputs			Significant Unobservable Inputs			Total		Percent of Total		Target Allocation Minimum		Target Allocation Maximum
	in Active Markets			(Level 2)			(Level 3)
	for Identical Assets
	(Level 1)
December 31, 2013
Cash	$	7		$	—		$	—		$	7	—	%	—	%	15	%
Interest-Bearing Money Market Fund	3,941			—			—			3,941		8.8	%	—	%	15	%
Arrow Common Stock1	4,291			—			—			4,291		9.6	%	—	%	10	%
North Country Funds - Equity 2	17,419			—			—			17,419		39.1	%
Other Mutual Funds - Equity	14,338			—			—			14,338		32.1	%
Total Equity Funds	31,757			—			—			31,757		71.2	%	55	%	85	%
North Country Funds - Fixed income 2	4,309			—			—			4,309		9.6	%
Other Mutual Funds - Fixed Income	348			—			—			348		0.8	%
Total Fixed Income Funds	4,657			—			—			4,657		10.4	%	10	%	30	%
Total	$	44,653		$	—		$	—		$	44,653	100	%
December 31, 2012
Cash	$	17		$	—		$	—		$	17	—	%	—	%	15	%
Interest-Bearing Money Market Fund	5,236			—			—			5,236		13.1	%	—	%	15	%
Arrow Common Stock	4,197			—			—			4,197		10.5	%	—	%	10	%
North Country Funds - Equity 2	13,043			—			—			13,043		32.8	%
Other Mutual Funds - Equity	11,160			—			—			11,160		28	%
Total Equity Funds	24,203			—			—			24,203		60.8	%	55	%	85	%
North Country Funds - Fixed income 2	4,236			—			—			4,236		10.6	%
Other Mutual Funds - Fixed Income	1,991			—			—			1,991		5	%
Total Fixed Income Funds	6,227			—			—			6,227		15.6	%	10	%	30	%
Total	$	39,880		$	—		$	—		$	39,880	100	%
1 Acquisition of Arrow Financial Corporation common stock was under 10% of the total fair value of the employee's pension plan assets at the time of acquisition.
2 The North Country Funds - Equity and the North Country Funds - Fixed Income are publicly traded mutual funds advised by Arrow's subsidiary, North Country Investment Advisers, Inc.
Schedule of Defined Benefit Plan Disclosures
	Employees'			Select			Postretirement
	Pension			Executive			Benefit
	Plan			Retirement			Plans
				Plan
Expected Future Benefit Payments
2014	$	3,068		$	452		$	510
2015	2,047			440			531
2016	2,344			416			539
2017	2,252			402			549
2018	2,165			388			562
2019-2023	12,516			1,699			3,026
Estimated Contributions During 2014	$	—		$	452		$	510
Assumed Health Care Cost Trend Rates
31-Dec-13
Health Care Cost Trend							8.5		%
Rate Assumed for Next Year
Rate to which the Cost Trend							5		%
Rate is Assumed to Decline
(the Ultimate Trend Rate)
Year that the Rate Reaches							2021
the Ultimate Trend Rate
31-Dec-12
Health Care Cost Trend							9		%
Rate Assumed for Next Year
Rate to which the Cost Trend							5		%
Rate is Assumed to Decline
(the Ultimate Trend Rate)
Year that the Rate Reaches							2021
the Ultimate Trend Rate
Effect of a One-Percentage Point Change in Assumed
Health Care Cost Trend Rates
Effect of a One Percentage Point Increase on							$	59
Service and Interest Cost Components
Effect of a One Percentage Point Decrease on							(49		)
Service and Interest Cost Components
Effect of a One Percentage Point Increase on							557
Accumulated Postretirement Benefit Obligation
Effect of a One Percentage Point Decrease on							(478		)
Accumulated Postretirement Benefit Obligation
Fair Value of Plan Assets (Defined Benefit Plan):
For information on fair value measurements, including descriptions of level 1, 2 and 3 of the fair value hierarchy and the valuation methods employed by Arrow, see Note 2 - “Summary of Significant Accounting Policies” and Note 17 - “Fair Values.”
The fair value of level 1 financial instruments in the table above are based on unadjusted, quoted market prices from exchanges in active markets.
In accordance with ERISA guidelines, the Board authorized the purchase of Arrow common stock up to 10% of the fair market value of the plan's assets at the time of acquisition.
Pension Plan Investment Policies and Strategies:
The Company maintains a non-contributory pension benefit plan covering substantially all employees for the purpose of rewarding long and loyal service to the Company.  The pension assets are held in trust and are invested in a prudent manner for the exclusive purpose of providing benefits to participants.  The investment objective is to achieve an inflation-protected rate of return that meets the actuarial assumption which is used for funding purposes.  The investment strategy attempts to maximize the investment return on assets at a level of risk deemed appropriate by the Company while complying with ERISA and any applicable regulations and laws.  The investment strategy utilizes asset allocation as a principal determinant for establishing the risk/reward profile of the assets. Asset allocation ranges are established, periodically reviewed, and adjusted as funding levels, and participant benefit characteristics change. Active and passive investment management is employed to help enhance the risk/return profile of the assets.
The Plan’s assets are invested in a diversified portfolio of equity securities comprised of companies with small, mid, and large capitalizations.  Both domestic and international equities are allowed to provide further diversification and opportunity for return in potentially higher growth economies with lower correlation of returns.  Growth and value styles of investment are employed to increase the diversification and offer varying opportunities for appreciation.  The fixed income portion of the plan may be invested in U.S. dollar denominated debt securities that shall be rated within the top four ratings categories by nationally recognized ratings agencies.   The fixed income portion will be invested without regard to industry or sector based on analysis of each target security’s structural and repayment features, current pricing and trading opportunities as well as credit quality of the issuer.  Individual bonds with ratings that fall below the Plan’s rating requirements will be sold only when it is in the best interests of the Plan.  Hybrid investments, such as convertible bonds, may be used to provide growth characteristics while offering some protection to declining equity markets by having a fixed income component.  Alternative investments such as Treasury Inflation Protected Securities, commodities, and REITs may be used to further enhance diversification while offering opportunities for return.  In accordance with ERISA guidelines, common stock of the Company may be purchased up to 10% of the fair market value of the Plan’s assets at the time of acquisition.  Derivative investments are prohibited in the plan.
The return on assets assumption was developed through review of historical market returns, historical asset class volatility and correlations, current market conditions, the Plan’s past experience, and expectations on potential future market returns. The assumption represents a long-term average view of the performance of the assets in the Plan, a return that may or may not be achieved during any one calendar year. The assumption is based on the return of the Plan using the historical 15 year return adjusted for the potential for lower than historical returns due to low interest rates, and an expected modest recovery in global economic growth as a result of the deep recession.
Cash Flows - We were not required to make any contribution to our qualified pension plan in 2013.    Arrow makes contributions for its postretirement benefits in an amount equal to actual expenses for the year.

Other_Expenses

Other Expenses	12 Months Ended
	Dec. 31, 2013
Other Income and Expenses [Abstract]	'
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]	'
	OTHER EXPENSES (Dollars In Thousands)
	Other operating expenses included in the consolidated statements of income are as follows:
		2013		2012		2011
	Computer Services	$	3,261	$	2,263	$	1,654
	Legal and Other Professional Fees	1,823		1,962		1,972
	Postage and Courier	1,046		1,040		1,088
	Stationery and Printing	905		975		891
	Advertising and Promotion	879		831		853
	Telephone and Communications	804		808		981
	Intangible Asset Amortization	452		518		510
	All Other	3,486		3,243		3,095
	Total Other Operating Expense	$	12,656	$	11,640	$	11,044

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	INCOME TAXES (Dollars In Thousands)
	The provision for income taxes is summarized below:
	Current Tax Expense:	2013			2012			2011
	Federal	$	7,933		$	8,763		$	6,726
	State	852			1,251			816
	Total Current Tax Expense	8,785			10,014			7,542
	Deferred Tax Expense (Benefit):
	Federal	172			(290		)	1,775
	State	122			(63		)	397
	Total Deferred Tax Expense (Benefit)	294			(353		)	2,172
	Total Provision for Income Taxes	$	9,079		$	9,661		$	9,714
	The provisions for income taxes differed from the amounts computed by applying the U.S. Federal Income Tax Rate of 35% for 2013, 2012 and 2011 to pre-tax income as a result of the following:
		2013			2012			2011
	Computed Tax Expense at Statutory Rate	$	10,806		$	11,144		$	11,076
	Increase (Decrease) in Income Taxes Resulting From:
	Tax-Exempt Income	(2,238		)	(2,132		)	(2,199		)
	Nondeductible Interest Expense	80			95			152
	State Taxes, Net of Federal Income Tax Benefit	633			814			788
	Other Items, Net	(202		)	(260		)	(103		)
	Total Provision for Income Taxes	$	9,079		$	9,661		$	9,714
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2013 and 2012 are presented below:
		2013			2012
	Deferred Tax Assets:
	Allowance for Loan Losses	$	5,794		$	6,105
	Pension and Deferred Compensation Plans	3,999			4,140
	Pension Liability Included in Accumulated Other Comprehensive Income	4,426			9,241
	Other	566			608
	Total Gross Deferred Tax Assets	14,785			20,094
	Valuation Allowance for Deferred Tax Assets	—			—
	Total Gross Deferred Tax Assets, Net of Valuation Allowance	$	14,785		$	20,094
	Deferred Tax Liabilities:
	Pension Plans	$	7,724		$	8,178
	Depreciation	1,561			1,475
	Deferred Income	3,526			3,189
	Net Unrealized Gains on Securities Available-for-Sale Included in	1,557			3,690
	Accumulated Other Comprehensive Income
	Goodwill	5,230			5,225
	Total Gross Deferred Tax Liabilities	$	19,598		$	21,757
	Management believes that the realization of the recognized net deferred tax assets at December 31, 2013 and 2012 is more likely than not, based on existing loss carryback ability, available tax planning strategies and expectations as to future taxable income.
	Interest and penalties are recorded as a component of the provision for income taxes, if any.  Tax years 2010 through 2013 are subject to Federal and New York State examination.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	EARNINGS PER SHARE (In Thousands, Except Per Share Amounts)
	The following table presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per common share ("EPS") for each of the years in the three-year period ended December 31, 2013.  All share and per share amounts have been adjusted for the 2013 2% stock dividend.
	Earnings Per Share
		Year-to-Date Period Ended:
		12/31/13		12/31/12		12/31/11
	Earnings Per Share - Basic:
	Net Income	$	21,795	$	22,179	$	21,933
	Weighted Average Shares - Basic	12,296		12,247		12,209
	Earnings Per Share - Basic	$	1.77	$	1.81	$	1.8
	Earnings Per Share - Diluted:
	Net Income	$	21,795	$	22,179	$	21,933
	Weighted Average Shares - Basic	12,296		12,247		12,209
	Dilutive Average Shares Attributable to Stock Options	31		10		12
	Weighted Average Shares - Diluted	12,327		12,257		12,221
	Earnings Per Share - Diluted	$	1.77	$	1.81	$	1.79
	Antidilutive Shares Excluded from the Calculation	47		203		136
	of Earnings Per Share

Fair_Values

Fair Values	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	FAIR VALUES (Dollars In Thousands)
	FASB ASC Subtopic 820-10 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles (GAAP) and requires certain disclosures about fair value measurements.  We do not have any nonfinancial assets or liabilities measured at fair value on a recurring basis. The only assets or liabilities that Arrow measured at fair value on a recurring basis at December 31, 2013 and 2012 were securities available-for-sale.  Arrow held no securities or liabilities for trading on such date.  For information on fair value measurements, including descriptions of level 1, 2 and 3 of the fair value hierarchy and the valuation methods employed by Arrow, see Note 2 - “Summary of Significant Accounting Policies.”
	The table below presents the financial instrument's fair value and the amounts within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement:
	Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis
		Fair Value Measurements at Reporting Date Using:
	Fair Value of Assets and Liabilities Measured on a Recurring Basis:	Fair Value		Quoted Prices		Significant Other		Significant Unobservable Inputs		Total Gains (Losses)
				In Active Markets for Identical Assets		Observable Inputs		(Level 3)
				(Level 1)		(Level 2)
	December 31, 2013
	Securities Available-for Sale:
	U.S. Agency Obligations	$	136,475	$	—	$	136,475	$	—
	State and Municipal Obligations	127,389		—		127,389		—
	Mortgage-Backed Securities - Residential	175,778		—		175,778		—
	Corporate and Other Debt Securities	16,798		—		16,798		—
	Mutual Funds and Equity Securities	1,166		—		1,166		—
	Total Securities Available-for-Sale	$	457,606	$	—	$	457,606	$	—
	December 31, 2012
	Securities Available-for Sale:
	U.S. Agency Obligations	$	122,457	$	—	$	122,457	$	—
	State and Municipal Obligations	84,838		—		84,838		—
	Mortgage-Backed Securities - Residential	261,804		—		261,804		—
	Corporate and Other Debt Securities	8,451		—		8,451		—
	Mutual Funds and Equity Securities	1,148		—		1,148		—
	Total Securities Available-for Sale	$	478,698	$	—	$	478,698	$	—
	Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
	December 31, 2013
	Other Real Estate Owned and Repossessed Assets, Net	$	144	$	—	$	—	$	144	$	(79	)
	December 31, 2012
	Collateral Dependent Impaired Loans	$	1,020	$	—	$	—	$	1,020	$	(1,021	)
	Other Real Estate Owned and Repossessed Assets, Net	$	1,034	$	—	$	—	$	1,034	$	(19	)
	We determine the fair value of financial instruments under the following hierarchy:
	•	Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
	•	Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability;
	•	Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).
	Fair Value Methodology for Assets and Liabilities Measured on a Recurring Basis
	The fair value of level 1 securities available-for-sale are based on unadjusted, quoted market prices from exchanges in active markets. The fair value of level 2 securities available-for-sale are based on an independent bond and equity pricing service for identical assets or significantly similar securities and an independent equity pricing service for equity securities not actively traded. The pricing services use a variety of techniques to arrive at fair value including market maker bids, quotes and pricing models. Inputs to the pricing models include recent trades, benchmark interest rates, spreads and actual and projected cash flows.
	Fair Value Methodology for Assets and Liabilities Measured on a Nonrecurring Basis
	The fair value of collateral dependent impaired loans and other real estate owned was based on third-party appraisals. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 35%.
	Other assets which might have been included in this table include mortgage servicing rights, goodwill and other intangible assets. Arrow evaluates each of these assets for impairment on an annual basis, with no impairment recognized for these assets at December 31, 2013 and December 31, 2012.
	Fair Value by Balance Sheet Grouping
	The following table presents a summary of the carrying amount, the fair value or an amount approximating fair value and the fair value hierarchy of Arrow’s financial instruments:
	Schedule of Fair Values by Balance Sheet Grouping
						Fair Value Hierarchy
		Carrying		Fair		Level 1		Level 2		Level 3
		Amount		Value
	December 31, 2013
	Cash and Cash Equivalents	$	49,980	$	49,980	$	49,980	$	—	$	—
	Securities Available-for-Sale	457,606		457,606		—		457,606		—
	Securities Held-to-Maturity	299,261		302,305		—		302,305		—
	Federal Home Loan Bank and Federal Reserve Bank Stock	6,281		6,281		6,281		—		—
	Net Loans	1,252,038		1,266,020		—		—		1,266,020
	Accrued Interest Receivable	5,745		5,745		5,745		—		—
	Deposits	1,842,330		1,839,613		1,595,103		244,510		—
	Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	11,777		11,777		11,777		—		—
	Federal Home Loan Bank Term Advances	73,000		74,629		53,000		21,629		—
	Junior Subordinated Obligations Issued	20,000		20,000		—		20,000		—
	to Unconsolidated Subsidiary Trusts
	Accrued Interest Payable	439		439		439		—		—
	December 31, 2012
	Cash and Cash Equivalents	$	48,832	$	48,832	$	48,832	$	—	$	—
	Securities Available-for-Sale	478,698		478,698		—		478,698		—
	Securities Held-to-Maturity	239,803		248,252		—		248,252		—
	Federal Home Loan Bank and Federal Reserve Bank Stock	5,792		5,792		5,792		—		—
Net Loans	1,157,043		1,192,628		—		—		1,192,628
Accrued Interest Receivable	5,486		5,486		5,486		—		—
Deposits	1,731,155		1,732,894		1,447,882		285,012		—
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	12,678		12,678		12,678		—		—
Federal Home Loan Bank Term Advances	59,000		60,312		29,000		31,312		—
Junior Subordinated Obligations Issued	20,000		20,000		—		20,000		—
to Unconsolidated Subsidiary Trusts
Accrued Interest Payable	584		584		584		—		—
Fair Value Methodology for Financial Instruments Not Measured on a Recurring or Nonrecurring Basis
Securities held-to-maturity are fair valued utilizing an independent bond pricing service for identical assets or significantly similar securities.  The pricing service uses a variety of techniques to arrive at fair value including market maker bids, quotes and pricing models.  Inputs to the pricing models include recent trades, benchmark interest rates, spreads and actual and projected cash flows.
Fair values for loans are estimated for portfolios of loans with similar financial characteristics.  Loans are segregated by type such as commercial, commercial real estate, residential mortgage, indirect and other consumer loans.  Each loan category is further segmented into fixed and adjustable interest rate terms and by performing and nonperforming categories.  The fair value methodology does not use an exit price methodology. The fair value of performing loans is calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest rate risk inherent in the loan.  The estimate of maturity is based on historical experience with repayments for each loan classification, modified, as required, by an estimate of the effect of current economic and lending conditions.   Fair value for nonperforming loans is generally based on recent external appraisals.  If appraisals are not available, estimated cash flows are discounted using a rate commensurate with the risk associated with the estimated cash flows.  Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information.
The fair value of time deposits is based on the discounted value of contractual cash flows, except that the fair value is limited to the extent that the customer could redeem the certificate after imposition of a premature withdrawal penalty.  The discount rates are estimated using the FHLBNY yield curve, which is considered representative of Arrow’s time deposit rates. The fair value of all other deposits is equal to the carrying value.
The fair value of FHLBNY advances is estimated based on the discounted value of contractual cash flows.  The discount rate is estimated using current rates on FHLBNY advances with similar maturities and call features.
Based on Arrow’s capital adequacy, the book value of the outstanding trust preferred securities (Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts) are considered to approximate fair value since the interest rates are variable (indexed to LIBOR) and Arrow is well-capitalized.

Leases

Leases	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Leases of Lessee Disclosure [Text Block]	'
	LEASES (Dollars In Thousands)
	At December 31, 2013, Arrow was obligated under a number of noncancellable operating leases for buildings and equipment. Certain of these leases provide for escalation clauses and contain renewal options calling for increased rentals if the lease is renewed.
	Net rental expense for the years ended December 31, 2013, 2012 and 2011 was as follows:
		2013		2012		2011
	Net Rental Expense	$	671	$	597	$	570
	Future minimum lease payments on operating leases at December 31, 2013 were as follows:
		Operating
		Leases
	2014	$	638
	2015	583
	2016	440
	2017	347
	2018	277
	Later Years	448
	Total Minimum Lease Payments	$	2,733
	Arrow leases five of its branch offices, at market rates, from Stewart’s Shops Corp.  Mr. Gary C. Dake, President of Stewart’s Shops Corp., serves on both the boards of Arrow and Saratoga National Bank and Trust Company.

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2013
Banking and Thrift [Abstract]	'
Regulatory Capital Requirements under Banking Regulations [Text Block]	'
	REGULATORY MATTERS (Dollars in Thousands)
	In the normal course of business, Arrow and its subsidiaries operate under certain regulatory restrictions, such as the extent and structure of covered inter-company borrowings and maintenance of reserve requirement balances.
	The principal source of the funds for the payment of stockholder dividends by Arrow has been from dividends declared and paid to Arrow by its bank subsidiaries.  As of December 31, 2013, the maximum amount that could have been paid by subsidiary banks to Arrow, without prior regulatory approval, was approximately $26,668.
	Under current Federal Reserve regulations, Arrow is prohibited from borrowing from the subsidiary banks unless such borrowings are secured by specific obligations.  Additionally, the maximum of any such borrowing is limited to 10% of an affiliate’s capital and surplus.
	Arrow and its subsidiary banks are subject to various regulatory capital requirements administered by the federal banking agencies.  Failure to meet minimum capital requirements can initiate certain mandatory--and possibly additional discretionary--actions by regulators that, if undertaken, could have a direct material effect on an institution’s financial statements.  Under capital adequacy guidelines and the regulatory framework for prompt corrective action, Arrow and its subsidiary banks must meet specific capital guidelines that involve quantitative measures of assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices.  Capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require Arrow and its subsidiary banks to maintain minimum capital amounts and ratios (set forth in the table below) of total and Tier I capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier I capital (as defined) to average assets (as defined).  Management believes, as of December 31, 2013 and 2012, that Arrow and both subsidiary banks meet all capital adequacy requirements to which they are subject.
	As of December 31, 2013, Arrow and both subsidiary banks qualified as well-capitalized under the regulatory framework for prompt corrective action.  To be categorized as “well-capitalized,” Arrow and its subsidiary banks must maintain minimum total risk-based, Tier I risk-based, and Tier I leverage ratios as set forth in the table below.  There are no conditions or events that management believes have changed Arrow’s or its subsidiary banks’ categories.
	Arrow’s and its subsidiary banks’, Glens Falls National Bank and Trust Company (“Glens Falls National”) and Saratoga National Bank and Trust Company (“Saratoga National”), actual capital amounts and ratios are presented in the table below as of December 31, 2013 and 2012:
		Actual				Minimum Amounts For Capital Adequacy Purposes						Minimum Amounts To Be Well-Capitalized
		Amount		Ratio		Amount			Ratio			Amount				Ratio
	As of December 31, 2013:
	Total Capital
	(to Risk Weighted Assets):
	Arrow	$	212,360	15.8	%	$	107,524		8	%		$	134,405			10	%
	Glens Falls National	172,720		15.4	%	89,725			8	%		112,156				10	%
	Saratoga National	33,396		14.8	%	18,052			8	%		22,565				10	%
	Tier I Capital
	(to Risk Weighted Assets):
	Arrow	197,906		14.7	%	53,852			4	%		80,778				6	%
	Glens Falls National	160,849		14.4	%	44,680			4	%		67,020				6	%
	Saratoga National	30,833		13.7	%	9,002			4	%		13,504				6	%
	Tier I Capital
	(to Average Assets):
	Arrow	197,906		9.2	%	86,046			4	%		86,046				4	%
	Glens Falls National	160,849		8.8	%	73,113			4	%		91,391				5	%
	Saratoga National	30,833		9.7	%	12,715			4	%		15,893				5	%
		Actual				Minimum Amounts For Capital					Minimum Amounts To Be Well-Capitalized
						Adequacy Purposes
		Amount		Ratio		Amount		Ratio			Amount			Ratio
	As of December 31, 2012:
	Total Capital
	(to Risk Weighted Assets):
	Arrow	$	200,480	16.3	%	98,395		8	%		122,994			10	%
	Glens Falls National	164,889		16.2	%	81,427		8	%		101,783			10	%
	Saratoga National	31,911		15.1	%	16,906		8	%		21,133			10	%
	Tier I Capital
	(to Risk Weighted Assets):
	Arrow	185,170		15	%	49,379		4	%		74,068			6	%
	Glens Falls National	152,205		14.9	%	40,860		4	%		61,291			6	%
	Saratoga National	29,297		13.8	%	8,492		4	%		12,738			6	%
	Tier I Capital
	(to Average Assets):
	Arrow	185,170		9.1	%	81,393		4	%		81,393			4	%
	Glens Falls National	152,205		8.8	%	69,184		4	%		86,480			5	%
	Saratoga National	29,297		9.4	%	12,467		4	%		15,584			5	%

Parent_Only_Financial_Informat

Parent Only Financial Information	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	'
	PARENT ONLY FINANCIAL INFORMATION (Dollars In Thousands)
	Condensed financial information for Arrow Financial Corporation is as follows:
	BALANCE SHEETS	December 31,
	ASSETS	2013			2012
	Interest-Bearing Deposits with Subsidiary Banks	$	3,349		$	1,913
	Available-for-Sale Securities	1,166			1,148
	Held-to-Maturity Securities	1,000			1,000
	Investment in Subsidiaries at Equity	206,680			192,985
	Other Assets	5,807			5,339
	Total Assets	$	218,002		$	202,385
	LIABILITIES
	Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	$	20,000		$	20,000
	Other Liabilities	5,848			6,560
	Total Liabilities	25,848			26,560
	STOCKHOLDERS’ EQUITY
	Total Stockholders’ Equity	192,154			175,825
	Total Liabilities and Stockholders’ Equity	$	218,002		$	202,385
	STATEMENTS OF INCOME	Years Ended December 31,
	Income:	2013			2012			2011
	Dividends from Bank Subsidiaries	$	12,900		$	12,700		$	14,450
	Interest and Dividends on Investments	116			123			127
	Other Income (Including Management Fees)	549			776			596
	Net Gains on Securities Transactions	—			63			17
	Total Income	13,565			13,662			15,190
	Expense:
	Interest Expense	640			692			669
	Salaries and Employee Benefits	59			75			92
	Other Expense	860			957			820
	Total Expense	1,559			1,724			1,581
	Income Before Income Tax Benefit and Equity
	in Undistributed Net Income of Subsidiaries	12,006			11,938			13,609
	Income Tax Benefit	634			575			477
	Equity in Undistributed Net Income of Subsidiaries	9,155			9,666			7,847
	Net Income	$	21,795		$	22,179		$	21,933
	The Statement of Changes in Stockholders’ Equity is not reported because it is identical to the Consolidated Statement of Changes in Stockholders’ Equity.
	STATEMENTS OF CASH FLOWS	Years Ended December 31,
		2013			2012			2011
	Cash Flows from Operating Activities:
	Net Income	$	21,795		$	22,179		$	21,933
	Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
	Undistributed Net Income of Subsidiaries	(9,155		)	(9,666		)	(7,847		)
	Net Gains on the Sale of Securities Available-for-Sale	—			(63		)	(17		)
	Shares Issued Under the Directors’ Stock Plan	198			175			175
	Stock-Based Compensation Expense	372			424			354
	Changes in Other Assets and Other Liabilities	(990		)	(1,640		)	(165		)
	Net Cash Provided by Operating Activities	12,220			11,409			14,433
	Cash Flows from Investing Activities:
	Proceeds from the Sale of Securities Available-for-Sale	45			681			410
	Purchases of Securities Available-for-Sale	(45		)	(359		)	(253		)
	Net Cash Provided by Investing Activities	—			322			157
	Cash Flows from Financing Activities:
	Stock Options Exercised	1,254			2,105			1,413
	Shares Issued Under the Employee Stock Purchase Plan	477			484			474
	Shares Issued for Dividend Reinvestment Plans	1,280			1,822			1,796
	Tax Benefit for Exercises of Stock Options	23			68			51
	Purchase of Treasury Stock	(1,709		)	(4,877		)	(6,039		)
	Cash Dividends Paid	(12,109		)	(11,815		)	(11,448		)
	Net Cash Used in Financing Activities	(10,784		)	(12,213		)	(13,753		)
	Net (Decrease) Increase in Cash and Cash Equivalents	1,436			(482		)	837
	Cash and Cash Equivalents at Beginning of the Year	1,913			2,395			1,558
	Cash and Cash Equivalents at End of the Year	$	3,349		$	1,913		$	2,395
	Supplemental Disclosures to Statements of
	Cash Flow Information:
Interest Paid	$	640		$	692		$	669
Non-cash Investing and Financing Activities:
Shares Issued for Acquisition of Subsidiary	233			233			5,261

Summary_of_Significant_Account1

Summary of Significant Accounting Policies Significant Accounting (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation [Text Block]	'
	Principles of Consolidation - The financial statements of Arrow and its wholly owned subsidiaries are consolidated and all material inter-company transactions have been eliminated.  In the “Parent Company Only” financial statements in Note 20, the investment in wholly owned subsidiaries is carried under the equity method of accounting.  When necessary, prior years’ consolidated financial statements have been reclassified to conform to the current-year financial statement presentation.
Segment Reporting [Policy Text Block]	'
	Segment Reporting - Arrow operations are primarily in the community banking industry, which constitutes Arrow’s only segment for financial reporting purposes.  Arrow provides other services, such as trust administration, retirement plan administration, advice to our proprietary mutual funds and insurance products, but these services do not rise to the quantitative thresholds for separate disclosure.  Arrow operates primarily in the northeastern region of New York State in Warren, Washington, Saratoga, Essex and Clinton counties and surrounding areas.
Cash and Cash Equivalents [Policy Text Block]	'
	Cash and Cash Equivalents - Cash and cash equivalents include the following items:  cash at branches, due from bank balances, cash items in the process of collection, interest-bearing bank balances and federal funds sold.
Securities [Policy Text Block]	'
	Securities - Management determines the appropriate classification of securities at the time of purchase.  Securities reported as held-to-maturity are those debt securities which Arrow has both the positive intent and ability to hold to maturity and are stated at amortized cost.  Securities available-for-sale are reported at fair value, with unrealized gains and losses reported in accumulated other comprehensive income or loss, net of taxes.  Realized gains and losses are based upon the amortized cost of the specific security sold.  A decline in the fair value of any available-for-sale or held-to-maturity security below cost that is deemed to be other-than-temporary results in an impairment to reduce the carrying amount to fair value.  To determine whether an impairment is other-than-temporary, we consider all available information relevant to the collectibility of the security, including past events, current conditions, and reasonable and supportable forecasts when developing an estimate of cash flows expected to be collected.  Evidence considered in this assessment includes the reasons for impairment, the severity and duration of the impairment, changes in value subsequent to year-end, forecasted performance of the investee, and the general market condition in the geographic area or industry the investee operates in.  When an other-than-temporary impairment has occurred on a debt security, the amount of the other-than-temporary impairment recognized in earnings depends on whether we intend to sell the debt security or more likely than not will be required to sell the debt security before recovery of its amortized cost basis less any current-period credit loss.  If we intend to sell the debt security or it is more likely than not that we will be required to sell the debt security before recovery of its amortized cost basis less any current-period credit loss, the other-than-temporary impairment is recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date.  If we do not intend to sell the debt security and it is not more likely than not that we will be required to sell the debt security before recovery of its amortized cost basis, the other-than-temporary impairment is separated into the amount representing the credit loss and the amount related to all other factors.  The amount of the total other-than-temporary impairment related to the credit loss is recognized in earnings.  The amount of the total other-than-temporary impairment related to other factors is recognized in other comprehensive income, net of applicable income taxes.
Loans and Allowance for Loan Losses [Policy Text Block]	'
	Loans and Allowance for Loan Losses - Interest income on loans is accrued and credited to income based upon the principal amount outstanding.  Loan fees and costs directly associated with loan originations are deferred and amortized/accreted as an adjustment to yield over the lives of the loans originated.
	From time-to-time, Arrow has sold (most with servicing retained) residential real estate loans at or shortly after origination.  Any gain or loss on the sale of loans, along with the value of the servicing right, is recognized at the time of sale as the difference between the recorded basis in the loan and net proceeds from the sale.  Loans held for sale are recorded at the lower of cost or fair value on an aggregate basis.
	Loans are placed on nonaccrual status either due to the delinquency status of principal and/or interest or a judgment by management that the full repayment of principal and interest is unlikely. Unless already placed on nonaccrual status, loans secured by home equity lines of credit are put on nonaccrual status when 120 days past due; residential real estate loans when 150 days past due; commercial and commercial real estate loans are evaluated on a loan-by-loan basis and are placed on nonaccrual status when 90 days past due if the full collection of principal and interest is uncertain. The balance of any accrued interest deemed uncollectible at the date the loan is placed on nonaccrual status is reversed, generally against interest income.  A loan is returned to accrual status at the later of the date when the past due status of the loan falls below the threshold for nonaccrual status or management deems that it is likely that the borrower will repay all interest and principal.  For payments received while the loan is on nonaccrual status, we may recognize interest income on a cash basis if the repayment of the remaining principal and accrued interest is deemed likely.
	The allowance for loan losses is maintained by charges to operations based upon our best estimate of the probable amount of loans that we will be unable to collect based on current information and events.  Provisions to the allowance for loan losses are offset by actual loan charge-offs (net of any recoveries).  We evaluate the loan portfolio for potential charge-offs on a monthly basis.  In general, automobile and other consumer loans are charged-off when 120 days delinquent.  Residential real estate loans are charged-off when a loss becomes known or based on a new appraisal at the earlier of 180 days past due or repossession.  Commercial and commercial real estate loans loans are evaluated early in their delinquency status and are charged-off when management concludes that not all principal will be repaid from on-going cash flows or liquidation of collateral. An evaluation of estimated proceeds from the liquidation of the loan’s collateral is compared to the loan carrying amount and a charge to the allowance for loan losses is taken for any deficiency.  While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions in Arrow's market area.  In addition, various Federal regulatory agencies, as an integral part of their examination process, review Arrow's allowance for loan losses. Such agencies may require Arrow to recognize additions to the allowance in future periods, based on their judgments about information available to them at the time of their examination, which may not be currently available to management.
	We consider nonaccrual loans over $250 thousand and all troubled debt restructured loans to be impaired loans and we evaluate these loans individually to determine the amount of impairment, if any. The amount of impairment, if any, related to individual impaired loans is measured based on either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's observable market price or the fair value of the collateral if the loan is collateral dependent. Arrow determines impairment for collateral dependent loans based on the fair value of the collateral less estimated costs to sell. Any excess of the recorded investment in the collateral dependent impaired loan over the estimated collateral value, less costs to sell, is typically charged off. For impaired loans which are not collateral dependent, impairment is measured by comparing the recorded investment in the loan to the present value of the expected cash flows, discounted at the loan’s effective interest rate.  If this amount is less than the recorded investment in the loan, an impairment reserve is recognized as part of the allowance for loan losses, or based upon the judgment of management all or a portion of the excess of the recorded investment in the loan over the present value of the estimated future cash flow may be charged off.
	The allowance for loan losses on the remaining loans is primarily determined based upon consideration of the historical net loss experience of the respective portfolios, adjusted as necessary based upon consideration of qualitative considerations impacting the inherent risk of loss in the respective loan portfolios.
	In management’s opinion, the balance of the allowance for loan losses, at each balance sheet date, is sufficient to provide for probable loan losses inherent in the corresponding loan portfolio.
Other Real Estate Owned and Repossessed Assets [Policy Text Block]	'
	Other Real Estate Owned and Repossessed Assets - Real estate acquired by foreclosure and assets acquired by repossession are recorded at the fair value of the property less estimated costs to sell at the time of repossession.  Subsequent declines in fair value, after transfer to other real estate owned and repossessed assets are recognized through a valuation allowance. Such declines in fair value along with related operating expenses to administer such properties or assets are charged directly to operating expense.
Premises and Equipment [Policy Text Block]	'
	Premises and Equipment - Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization included in operating expenses are computed largely on the straight-line method. Depreciation is based on the estimated useful lives of the assets (buildings and improvements 20-40 years; furniture and equipment 7-10 years; data processing equipment 5-7 years) and, in the case of leasehold improvements, amortization is computed over the terms of the respective leases or their estimated useful lives, whichever is shorter.  Gains or losses on disposition are reflected in earnings.
Income Taxes [Policy Text Block]	'
	Income Taxes - Arrow accounts for income taxes under the asset and liability method.  Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases.  Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income tax expense in the period that includes the enactment date.  Arrow’s policy is that deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
Goodwill and Other Intangible Assets [Policy Text Block]	'
	Goodwill and Other Intangible Assets - Identifiable intangible assets acquired in a business combination are capitalized and amortized.  Any remaining unidentifiable intangible asset is classified as goodwill, for which amortization is not required but which must be evaluated for impairment.  Arrow tests for impairment of goodwill on an annual basis, or when events and circumstances indicate potential impairment.  In evaluating goodwill for impairment, Arrow first assesses certain qualitative factors to determine if it is more likely than not that the fair value of the reporting unit is less than its carrying value. If it is more likely than not that the fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired. If the carrying amount of a reporting unit exceeds its fair value, the second step of the goodwill impairment test is performed to measure the amount of impairment loss, if any.
	The carrying amounts of other recognized intangible assets that meet recognition criteria and for which separate accounting records have been maintained (core deposit intangibles and mortgage servicing rights), have been included in the consolidated balance sheet as “Other Intangible Assets, Net.”  Core deposit intangibles are being amortized on a straight-line basis over a period of ten to fifteen years.
	Arrow has sold residential real estate loans, primarily to Freddie Mac, with servicing retained.   Mortgage servicing rights are recognized as an asset when loans are sold with servicing retained, by allocating the cost of an originated mortgage loan between the loan and servicing right based on estimated relative fair values.  The cost allocated to the servicing right is capitalized as a separate asset and amortized in proportion to, and over the period of, estimated net servicing income.  Capitalized mortgage servicing rights are evaluated for impairment by comparing the asset’s carrying value to its current estimated fair value.  Fair values are estimated using a discounted cash flow approach, which considers future servicing income and costs, current market interest rates, and anticipated prepayment, and default rates.  Impairment losses are recognized through a valuation allowance for servicing rights having a current fair value that is less than amortized cost on an aggregate basis.  Adjustments to increase or decrease the valuation allowance are charged or credited to income as a component of other operating income.
Pension and Postretirement Benefits [Policy Text Block]	'
	Pension and Postretirement Benefits - Arrow maintains a non-contributory, defined benefit pension plan covering substantially all employees, a supplemental pension plan covering certain executive officers selected by the Board of Directors, and certain post-retirement medical, dental and life insurance benefits for employees and retirees.  The costs of these plans, based on actuarial computations of current and future benefits for employees, are charged to current operating expenses. The cost of post-retirement benefits other than pensions is recognized on an accrual basis as employees perform services to earn the benefits.  Arrow recognizes the overfunded or underfunded status of our single employer defined benefit pension plan as an asset or liability on its consolidated balance sheet and recognizes changes in the funded status in comprehensive income in the year in which the change occurred.
	Prior service costs or credits are amortized on a straight-line basis over the average remaining service period of active participants.  Gains and losses in excess of 10% of the greater of the benefit obligation or the fair value of assets are amortized over the average remaining service period of active participants.
Stock-Based Compensation Plans [Policy Text Block]	'
	Stock-Based Compensation Plans - Arrow has two stock option plans, which are described more fully in Note 12.  The Company expenses the grant date fair value of options granted.  The expense is recognized over the vesting period of the grant, typically four years, on a straight-line basis. Shares are generally issued from treasury for the exercise of stock options.
	Arrow sponsors an Employee Stock Purchase Plan ("ESPP") under which employees may purchase Arrow’s common stock at a 5% discount below market price at the time of purchase. This stock purchase plan is not considered a compensatory plan.
	Arrow sponsors an Employee Stock Ownership Plan ("ESOP"), a qualified defined contribution plan.   The ESOP has borrowed funds from one of Arrow’s subsidiary banks to purchase Arrow common stock.  The shares pledged as collateral are reported as a reduction of Arrow’s stockholders’ equity.  Compensation expense is recognized as shares are released for allocation to individual employee accounts equal to the current average market price.
Securities Sold Under Agreements to Repurchase [Policy Text Block]	'
	Securities Sold Under Agreements to Repurchase - In securities repurchase agreements, Arrow receives cash from a counterparty in exchange for the transfer of securities to a third party custodian’s account that explicitly recognizes Arrow’s interest in the securities.  These agreements are accounted for by Arrow as secured financing transactions, since it maintains effective control over the transferred securities, and meets other criteria for such accounting.  Accordingly, the cash proceeds are recorded as borrowed funds, and the underlying securities continue to be carried in Arrow’s securities available-for-sale portfolio.
Earnings Per Share [Policy Text Block]	'
	Earnings Per Share (“EPS”) - Basic EPS excludes dilution and is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period.  Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as Arrow’s stock options), computed using the treasury stock method.  Unallocated common shares held by Arrow’s Employee Stock Ownership Plan are not included in the weighted average number of common shares outstanding for either the basic or diluted EPS calculation.
Financial Instruments [Policy Text Block]	'
	Financial Instruments - Arrow is a party to certain financial instruments with off-balance sheet risk, such as:  commercial lines of credit, construction lines of credit, overdraft protection, home equity lines of credit and standby letters of credit.  Arrow's policy is to record such instruments when funded.  Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument.  These estimates do not reflect any premium or discount that could result from offering for sale at one time Arrow's entire holdings of a particular financial instrument.  Because no market exists for a significant portion of Arrow's financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors.  These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision.  Changes in assumptions could significantly affect the estimates.
	Fair value estimates are based on existing on- and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments.  For example, Arrow has a trust department that contributes net fee income annually.  The value of trust department customer relationships is not considered a financial instrument of the Company, and therefore this value has not been incorporated into the fair value estimates. Other significant assets and liabilities that are not considered financial assets or liabilities include deferred taxes, premises and equipment, the value of low-cost, long-term core deposits and goodwill.  In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of the estimates.
	The carrying amount of the following short-term assets and liabilities is a reasonable estimate of fair value: cash and due from banks, federal funds sold and purchased, securities sold under agreements to repurchase, demand deposits, savings, N.O.W. and money market deposits, other short-term borrowings, accrued interest receivable and accrued interest payable.  The fair value estimates of other on- and off-balance sheet financial instruments, as well as the method of arriving at fair value estimates, are included in the related footnotes and summarized in Note 17.
	Fair Value Measures - We determine the fair value of financial instruments under the following hierarchy:
	•	Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
	•	Level 2 – Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability;
	•	Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
Management's Use of Estimates [Policy Text Block]	'
	Management’s Use of Estimates -The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of income and expenses during the reporting period.  Our most significant estimates are the allowance for loan losses, the evaluation of other-than-temporary impairment of investment securities, goodwill impairment, pension and other postretirement liabilities, analysis of a need for a valuation allowance for deferred tax assets and other fair value calculations. Actual results could differ from those estimates.
	A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses.  In connection with the determination of the allowance for loan losses, management obtains appraisals for properties.  The allowance for loan losses is management’s best estimate of probable loan losses incurred as of the balance sheet date.  While management uses available information to recognize losses on loans, future adjustments to the allowance for loan losses may be necessary based on changes in economic conditions.
Recent Accounting Pronouncements [Policy Text Block]	'
	Recent Accounting Pronouncements
	During 2013 the FASB issued twelve accounting standards updates and, through the date of this report, an additional five in 2014. Of the seventeen updates, fourteen did not apply to Arrow.
	ASU 2013-02 "Comprehensive Income" requires additional disclosures relating to reclassifications out of accumulated other comprehensive income. The new disclosures are included in Note 5 - Comprehensive Income.
	ASU 2013-10 "Derivatives and Hedging" now allows the federal funds effective swap rate as a benchmark interest rate for hedge accounting. While this has no current impact on Arrow, it may provide us an option for future swaps that we did not have before the ASU.
	ASU 2014-01 "Investments-Equity Method and Joint Ventures" allows an entity that invests in affordable housing projects that qualify for low-income housing tax credits to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. The standard is effective for annual years beginning after December 15, 2014, with earlier adoption allowed. We are evaluating the impact of adopting this election and do not expect that this will have a material impact on our financial condition or results of operations.
	ASU 2014-04 "Receivables - Trouble Debt Restructurings by Creditors" provides additional guidance on when an in substance repossession or foreclosure occurs and is effective for annual periods beginning after December 15, 2014. We are evaluating the impact of adopting this standard, and we do not expect that it will have a material impact on our financial condition or results of operations.

Cash_and_Cash_Equivalents_Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2013
Cash and Cash Equivalents [Abstract]	'
Schedule of Cash and Cash Equivalents [Table Text Block]	'
	The following table is the schedule of cash and cash equivalents at December 31, 2013 and 2012:
		2013		2012
	Cash and Due From Banks	$	37,275	$	37,076
	Interest-Bearing Deposits at Banks	12,705		11,756
	Total Cash and Cash Equivalents	$	49,980	$	48,832
	Supplemental Information:
	Total required reserves, including vault cash and Federal Reserve Bank deposits	$	18,879	$	23,168

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Available-for-sale Securities [Table Text Block]	'
	The following table is the schedule of Available-For-Sale Securities at December 31, 2013 and 2012:
	Available-For-Sale Securities
			U.S. Agency			State and		Mortgage-		Corporate		Mutual Funds		Total
			Obligations			Municipal		Backed		and Other		and Equity		Available-
						Obligations		Securities -		Debt		Securities		For-Sale
								Residential		Securities				Securities
	December 31, 2013
	Available-For-Sale Securities,		$	136,868		$	127,224	$	171,321	$	17,142	$	1,120	$	453,675
	at Amortized Cost
	Available-For-Sale Securities,		136,475			127,389		175,778		16,798		1,166		457,606
	at Fair Value
	Gross Unrealized Gains		2			306		4,714		10		46		5,078
	Gross Unrealized Losses		395			141		257		354		—		1,147
	Available-For-Sale Securities,													243,769
	Pledged as Collateral
	Maturities of Debt Securities,
	at Amortized Cost:
	Within One Year		—			48,570		10,920		—				59,490
	From 1 - 5 Years		136,868			76,308		146,677		16,142				375,995
	From 5 - 10 Years		—			1,666		13,608		—				15,274
	Over 10 Years		—			680		116		1,000				1,796
	Available-For-Sale Securities
			U.S. Agency			State and		Mortgage-		Corporate		Mutual Funds		Total
			Obligations			Municipal		Backed		and Other		and Equity		Available-
						Obligations		Securities -		Debt		Securities		For-Sale
								Residential		Securities				Securities
	Maturities of Debt Securities,
	at Fair Value:
	Within One Year		—			48,623		11,181		—				59,804
	From 1 - 5 Years		136,475			76,405		150,330		15,998				379,208
	From 5 - 10 Years		—			1,681		14,146		—				15,827
	Over 10 Years		—			680		121		800				1,601
	Securities in a Continuous
	Loss Position, at Fair Value:
	Less than 12 Months		$	60,664		$	29,967	$	15,190	$	7,375	$	—	$	113,196
	12 Months or Longer		33,849			4,597		11,841		6,063		—		56,350
	Total		$	94,513		$	34,564	$	27,031	$	13,438	$	—	$	169,546
	Number of Securities in a		26			107		13		19		—		165
	Continuous Loss Position
	Unrealized Losses on
	Securities in a Continuous
	Loss Position:
	Less than 12 Months		$	336		$	120	$	108	$	92	$	—	$	656
	12 Months or Longer		59			21		149		262		—		491
	Total		$	395		$	141	$	257	$	354	$	—	$	1,147
	December 31, 2012
	Available-For-Sale Securities,		$	122,297		$	84,798	$	252,480	$	8,689	$	1,120	$	469,384
	at Amortized Cost
	Available-For-Sale Securities,		122,457			84,838		261,804		8,451		1,148		478,698
	at Fair Value
	Gross Unrealized Gains		204			206		9,405		—		28		9,843
	Gross Unrealized Losses		44			166		81		238		—		529
	Available-For-Sale Securities,													260,292
	Pledged as Collateral
	Securities in a Continuous
	Loss Position, at Fair Value:
	Less than 12 Months		$	72,531		$	46,627	$	10,230	$	8,451	$	—	$	137,839
	12 Months or Longer		—			2,149		4,968		—		—		7,117
	Total		$	72,531		$	48,776	$	15,198	$	8,451	$	—	$	144,956
	Number of Securities in a		22			198		7		11		—		238
	Continuous Loss Position
	Unrealized Losses on
	Securities in a Continuous
Loss Position:
Less than 12 Months		$	44		$	160	$	50	$	238	$	—	$	492
12 Months or Longer		—			6		31		—		—		37
Total		$	44		$	166	$	81	$	238	$	—	$	529
Held-to-maturity Securities [Table Text Block]	'
	The following table is the schedule of Held-To-Maturity Securities at December 31, 2013 and 2012:
	Held-To-Maturity Securities
			State and			Mortgage-		Corporate		Total
			Municipal			Backed		and Other		Held-To
			Obligations			Securities -		Debt		Maturity
						Residential		Securities		Securities
	December 31, 2013
	Held-To-Maturity Securities,		$	198,206		$	100,055	$	1,000	$	299,261
	at Amortized Cost
	Held-To-Maturity Securities,		202,390			98,915		1,000		302,305
	at Fair Value
	Gross Unrealized Gains		4,762			24		—		4,786
	Gross Unrealized Losses		578			1,164		—		1,742
	Held-To-Maturity Securities,									298,261
	Pledged as Collateral
	Maturities of Debt Securities,
	at Amortized Cost:
	Within One Year		43,043			—		—		43,043
	From 1 - 5 Years		82,001			41,958		—		123,959
	From 5 - 10 Years		69,832			58,097		—		127,929
	Over 10 Years		3,330			—		1,000		4,330
	Maturities of Debt Securities,
	at Fair Value:
	Within One Year		43,113			—		—		43,113
	From 1 - 5 Years		83,896			41,788		—		125,684
	From 5 - 10 Years		71,967			57,127		—		129,094
	Over 10 Years		3,414			—		1,000		4,414
	Securities in a Continuous
	Loss Position, at Fair Value:
	Less than 12 Months		$	23,633		$	85,339	$	—	$	108,972
	12 Months or Longer		5,111			—		—		5,111
	Total		$	28,744		$	85,339	$	—	$	114,083
	Number of Securities in a		101			36		—		137
	Continuous Loss Position
	Unrealized Losses on
	Securities in a Continuous
	Loss Position:
	Less than 12 Months		$	519		$	1,164	$	—	$	1,683
	12 Months or Longer		59			—		—		59
	Total		$	578		$	1,164	$	—	$	1,742
	December 31, 2012
	Held-To-Maturity Securities,		$	183,373		$	55,430	$	1,000	$	239,803
	at Amortized Cost
	Held-To-Maturity Securities,		191,196			56,056		1,000		248,252
	at Fair Value
	Gross Unrealized Gains		7,886			626		—		8,512
	Gross Unrealized Losses		63			—		—		63
	Held-To-Maturity Securities,									238,803
	Pledged as Collateral
	Held-To-Maturity Securities
			State and			Mortgage-		Corporate		Total
			Municipal			Backed		and Other		Held-To
			Obligations			Securities -		Debt		Maturity
						Residential		Securities		Securities
	Securities in a Continuous
	Loss Position, at Fair Value:
	Less than 12 Months		$	21,583		$	—	$	—	$	21,583
	12 Months or Longer		503			—		—		503
	Total		$	22,086		$	—	$	—	$	22,086
	Number of Securities in a		61			—		—		61
	Continuous Loss Position
	Unrealized Losses on
	Securities in a Continuous
Loss Position:
Less than 12 Months		$	62		$	—	$	—	$	62
12 Months or Longer		1			—		—		1
Total		$	63		$	—	$	—	$	63
Schedule of Cost Method Investments [Table Text Block]	'
	Schedule of Federal Reserve Bank and Federal Home Loan Bank Stock
	Federal Reserve Bank and Federal Home Loan Bank Stock are carried at cost.
		December 31,
		2013			2012
	Federal Reserve Bank Stock	$	1,035		$	1,018
	Federal Home Loan Bank Stock	5,246			4,774
	Total Federal Reserve Bank and Federal Home Loan Bank Stock	$	6,281		$	5,792

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2013
Loans and Leases Receivable Disclosure [Abstract]	'
Past Due Financing Receivables [Table Text Block]	'
	Loan Categories and Past Due Loans
	The following table presents loan balances outstanding as of December 31, 2013 and December 31, 2012 and an analysis of the recorded investment in loans that are past due at these dates.  Generally, Arrow considers a loan past due 30 or more days if the borrower is two or more payments past due.
	Schedule of Past Due Loans by Loan Category
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
	December 31, 2013
	Loans Past Due 30-59 Days	$	304		$	—		$	200		$	37		$	3,233		$	529		$	4,303
	Loans Past Due 60-89 Days	601			—			1,200			19			1,041			1,527			4,388
	Loans Past Due 90 or More Days	177			—			2,034			—			98			3,113			5,422
	Total Loans Past Due	1,082			—			3,434			56			4,372			5,169			14,113
	Current Loans	86,811			27,815			284,685			7,593			389,832			455,623			1,252,359
	Total Loans	$	87,893		$	27,815		$	288,119		$	7,649		$	394,204		$	460,792		$	1,266,472
	Loans 90 or More Days Past Due and Still Accruing Interest	$	28		$	—		$	—		$	—		$	—		$	624		$	652
	Nonaccrual Loans	$	352		$	—		$	2,048		$	—		$	219		$	3,860		$	6,479
	December 31, 2012
	Loans Past Due 30-59 Days	$	1,045		$	—		$	534		$	43		$	2,427		$	407		$	4,456
	Loans Past Due 60-89 Days	1,588			—			1,332			17			793			2,466			6,196
	Loans Past Due 90 or more Days	494			—			1,871			—			185			1,462			4,012
	Total Loans Past Due	3,127			—			3,737			60			3,405			4,335			14,664
	Current Loans	102,409			29,149			241,440			6,624			345,695			432,360			1,157,677
	Total Loans	$	105,536		$	29,149		$	245,177		$	6,684		$	349,100		$	436,695		$	1,172,341
	Loans 90 or More Days Past Due and Still Accruing Interest	$	126		$	—		$	378		$	—		$	42		$	374		$	920
	Nonaccrual Loans	$	1,787		$	—		$	2,026		$	1		$	419		$	2,400		$	6,633
Allowance for Credit Losses on Financing Receivables [Table Text Block]	'
	Allowance for Loan Losses
	The following table presents a rollforward of the allowance for loan losses and other information pertaining to the allowance for loan losses:
	Allowance for Loan Losses
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Unallocated			Total
	Rollfoward of the Allowance for Loan Losses for the Year Ended:
	31-Dec-12	$	2,344		$	601		$	3,050		$	304		$	4,536		$	3,405		$	1,058		$	15,298
	Charge-offs	(926		)	—			(11		)	(28		)	(431		)	(15		)	—			(1,411		)
	Recoveries	88			—			—			3			256			—			—			347
	Provision	380			(184		)	506			(7		)	(155		)	(364		)	24			200
	31-Dec-13	$	1,886		$	417		$	3,545		$	272		$	4,206		$	3,026		$	1,082		$	14,434
	31-Dec-11	$	1,927		$	602		$	3,136		$	350		$	4,496		$	3,414		$	1,078		$	15,003
	Charge-offs	(90		)	—			(206		)	(52		)	(401		)	(33		)	—			(782		)
	Recoveries	23			—			—			9			200			—			—			232
	Provision	484			(1		)	120			(3		)	241			24			(20		)	845
	December 31, 2012	$	2,344		$	601		$	3,050		$	304		$	4,536		$	3,405		$	1,058		$	15,298
	31-Dec-10	$	2,037		$	135		$	2,993		$	328		$	4,760		$	3,163		$	1,273		$	14,689
	Charge-offs	(105		)	—			—			(42		)	(480		)	(147		)	—			(774		)
	Recoveries	17			—			—			28			198			—			—			243
	Provision	(22		)	467			143			36			18			398			(195		)	845
	31-Dec-11	$	1,927		$	602		$	3,136		$	350		$	4,496		$	3,414		$	1,078		$	15,003
	Allowance for Loan Losses
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Unallocated			Total
	31-Dec-13
	Allowance for loan losses - Loans Individually Evaluated for Impairment	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
	Allowance for loan losses - Loans Collectively Evaluated for Impairment	$	1,886		$	417		$	3,545		$	272		$	4,206		$	3,026		$	1,082		$	14,434
	Ending Loan Balance - Individually Evaluated for Impairment	$	221		$	—		$	1,785		$	—		$	173		$	2,309		$	—		$	4,488
	Ending Loan Balance - Collectively Evaluated for Impairment	$	87,672		$	27,815		$	286,334		$	7,649		$	394,031		$	458,483		$	—		$	1,261,984
	December 31, 2012
	Allowance for loan losses - Loans Individually Evaluated for Impairment	$	853		$	—		$	—		$	—		$	—		$	—		$	—		$	853
	Allowance for loan losses - Loans Collectively Evaluated for Impairment	$	1,491		$	601		$	3,050		$	304		$	4,536		$	3,405		$	1,058		$	14,445
	Ending Loan Balance - Individually Evaluated for Impairment	$	1,432		$	—		$	2,528		$	—		$	203		$	1,090		$	—		$	5,253
	Ending Loan Balance - Collectively Evaluated for Impairment	$	104,104		$	29,149		$	242,649		$	6,684		$	348,897		$	435,605		$	—		$	1,167,088
Financing Receivable Credit Quality Indicators [Table Text Block]	'
	Credit Quality Indicators
	The following table presents the credit quality indicators by loan category at December 31, 2013 and December 31, 2012:
	Loan Credit Quality Indicators
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
	December 31, 2013
	Credit Risk Profile by Creditworthiness Category:
	Satisfactory	$	79,966		$	27,815		$	267,612											$	375,393
	Special Mention	204			—			634												838
	Substandard	7,723			—			19,873												27,596
	Doubtful	—			—			—												—
	Credit Risk Profile Based on Payment Activity:
	Performing										$	7,649		$	393,985		$	456,308		857,942
	Nonperforming										—			219			4,484			4,703
	December 31, 2012
	Credit Risk Profile by Creditworthiness Category:
	Satisfactory	$	97,085		$	27,913		$	225,312											$	350,310
	Special Mention	192			—			1,419												1,611
	Substandard	6,872			1,236			18,446												26,554
	Doubtful	1,387			—			—												1,387
	Credit Risk Profile Based on Payment Activity:
	Performing										$	6,683		$	348,676		$	433,922		$	789,281
	Nonperforming										1			424			2,773			3,198
Impaired Financing Receivables [Table Text Block]	'
	Impaired Loans
	The following table presents information on impaired loans based on whether the impaired loan has a recorded allowance or no recorded allowance:
	Impaired Loans
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
	December 31, 2013
	Recorded Investment:
	With No Related Allowance	$	221		$	—		$	1,785		$	—		$	173		$	2,309		$	4,488
	With a Related Allowance	—			—			—			—			—			—			—
	Unpaid Principal Balance:
	With No Related Allowance	$	221		$	—		$	1,785		$	—		$	173		$	2,309		$	4,488
	With a Related Allowance	—			—			—			—			—			—			—
	December 31, 2012
	Recorded Investment:
	With No Related Allowance	$	45		$	—		$	2,528		$	—		$	203		$	1,090		$	3,866
	With a Related Allowance	1,387			—			—			—			—			—			$	1,387
	Unpaid Principal Balance:
	With No Related Allowance	$	45		$	—		$	2,695		$	—		$	203		$	1,090		$	4,033
	With a Related Allowance	1,387			—			—			—			—			—			$	1,387
	For the Year-To-Date Period Ended:
	December 31, 2013
	Average Recorded Balance:
	With No Related Allowance	$	133		$	—		$	2,157		$	—		$	188		$	1,700		$	4,178
	With a Related Allowance	694			—			—			—			—			—			694
	Interest Income Recognized:
	With No Related Allowance	$	4		$	—		$	—		$	—		$	9		$	8		$	21
	With a Related Allowance	—			—			—			—			—			—			—
	Cash Basis Income:
	With No Related Allowance	$	—		$	—		$	—		$	—		$	—		$	—		$	—
	With a Related Allowance	—			—			—			—			—			—			—
	December 31, 2012
	Average Recorded Balance:
	With No Related Allowance	$	56		$	—		$	2,241		$	—		$	236		$	1,599		$	4,132
	With a Related Allowance	694			—			—			—			—			—			$	694
	Interest Income Recognized:
	With No Related Allowance	$	6		$	—		$	64		$	—		$	12		$	9		$	91
	With a Related Allowance	—			—			—			—			—			—			$	—
	Cash Basis Income:
	With No Related Allowance	$	—		$	—		$	64		$	—		$	—		$	—		$	64
	With a Related Allowance	—			—			—			—			—			—			$	—
	December 31, 2011
	Average Recorded Balance:
	With No Related Allowance	$	40		$	—		$	1,993		$	5		$	274		$	1,328		$	3,640
	Interest Income Recognized:
	With No Related Allowance	$	6		$	—		$	42		$	—		$	19		$	7		$	74
	Cash Basis Income:
	With No Related Allowance	$	—		$	—		$	42		$	—		$	—		$	—		$	42
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	'
	Loans Modified in Trouble Debt Restructurings
	The following table presents information on loans modified in trouble debt restructurings during the periods indicated:
	Loans Modified in Trouble Debt Restructurings During the Period
					Commercial			Commercial			Other
		Commercial			Construction			Real Estate			Consumer			Automobile			Residential			Total
	For the Year Ended:
	December 31, 2013
	Number of Loans	1			—			—			—			9			—			10
	Pre-Modification Outstanding Recorded Investment	$	169		$	—		$	—		$	—		$	88		$	—		$	257
	Post-Modification Outstanding Recorded Investment	$	200		$	—		$	—		$	—		$	88		$	—		$	288
	Subsequent Default, Number of Contracts	—			—			—			—			—			—			—
	Subsequent Default, Recorded Investment	—			—			—			—			—			—			—
	Commitments to lend additional funds to modified loans	—			—			—			—			—			—			—
	December 31, 2012
	Number of Loans	—			—			2			—			17			—			19
	Pre-Modification Outstanding Recorded Investment	$	—		$	—		$	47		$	—		$	160		$	—		$	207
	Post-Modification Outstanding Recorded Investment	$	—		$	—		$	47		$	—		$	160		$	—		$	207
	Subsequent Default, Number of Contracts	—			—			—			—			—			—			—
	Subsequent Default, Recorded Investment	—			—			—			—			—			—			—
	Commitments to lend additional funds to modified loans	—			—			—			—			—			—			—
	December 31, 2011
	Number of Loans	1			—			1			—			14			1			17
	Pre-Modification Outstanding Recorded Investment	$	63		$	—		$	917		$	—		$	121		$	242		$	1,343
	Post-Modification Outstanding Recorded Investment	$	63		$	—		$	917		$	—		$	121		$	242		$	1,343
	Subsequent Default, Number of Contracts	—			—			—			—			—			—			—
	Subsequent Default, Recorded Investment	—			—			—			—			—			—			—
	Commitments to lend additional funds to modified loans	—			—			—			—			—			—			—
Financing Receivable Supplemental Information [Table Text Block]	'
	Schedule of Supplemental Loan Information
		2013			2012
	Supplemental Information:
	Unamortized deferred loan origination costs, net of deferred loan	$	2,152		$	1,571
	origination fees, included in the above balances
	Overdrawn deposit accounts, included in the above balances	501			690
	Pledged loans secured by one-to-four family residential mortgages	270,372			133,709
	under a blanket collateral agreement to secure borrowings from
	the Federal Home Loan Bank of New York
	Residential real estate loans serviced for Freddie Mac, not included	156,593			134,688
	in the balances above
	Loans held for sale at period-end, included in the above balances	64			2,801
	Loans to Related Parties:
	Balance at beginning of year	$	17,447		$	15,772
	Adjustment due to change in composition of related parties	(8,819		)	45
	New loans and renewals, during the year	2,253			5,939
	Repayments, during the year	(3,112		)	(4,309		)
	Balance at end of year	$	7,769		$	17,447

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	A summary of premises and equipment at December 31, 2013 and 2012 is presented below:
		2013			2012
	Land and Bank Premises	$	35,114		$	33,908
	Equipment, Furniture and Fixtures	20,851			20,123
	Leasehold Improvements	1,190			957
	Total Cost	57,155			54,988
	Accumulated Depreciation and Amortization	(28,001		)	(26,091		)
	Net Premises and Equipment	$	29,154		$	28,897
	Amounts charged to expense for depreciation totaled $1,928, $1,521 and $1,382 in 2013, 2012 and 2011, respectively.

Other_Intangible_Assets_Tables

Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
	The following table presents information on Arrow’s intangible assets (other than goodwill) as of December 31, 2013, 2012 and 2011:
		Depositor			Mortgage			Customer Intangibles1			Total
		Intangibles1			Servicing
					Rights2
	Gross Carrying Amount, December 31, 2013	$	2,247		$	1,582		$	4,451		$	8,280
	Accumulated Amortization	(2,186		)	(622		)	(1,332		)	(4,140		)
	Net Carrying Amount, December 31, 2013	$	61		$	960		$	3,119		$	4,140
	Gross Carrying Amount, December 31, 2012	$	2,247		$	1,251		$	4,451		$	7,949
	Accumulated Amortization	(2,094		)	(392		)	(971		)	(3,457		)
	Net Carrying Amount, December 31, 2012	$	153		$	859		$	3,480		$	4,492
	Rollforward of Intangible Assets:
	Balance, December 31, 2010	$	460		$	371		$	627		$	1,458
	Intangible Assets Acquired	—			339			3,573			3,912
	Amortization of Intangible Assets	(174		)	(111		)	(336		)	(621		)
	Balance, December 31, 2011	286			599			3,864			4,749
	Intangible Assets Acquired	—			417			—			417
	Amortization of Intangible Assets	(133		)	(157		)	(384		)	(674		)
	Balance, December 31, 2012	153			859			3,480			4,492
	Intangible Assets Acquired	—			331			—			331
	Amortization of Intangible Assets	(92		)	(230		)	(361		)	(683		)
	Balance, December 31, 2013	$	61		$	960		$	3,119		$	4,140
	1 Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense.
	2 Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	The following table presents the remaining estimated annual amortization expense for Arrow's intangible assets as of December 31, 2013:
		Depositor			Mortgage			Customer Intangibles1			Total
		Intangibles1			Servicing
					Rights2
	Estimated Annual Amortization Expense:
	2014	$	51		$	253		$	337		$	641
	2015	10			230			319			559
	2016	—			209			301			510
	2017	—			150			281			431
	2018	—			96			263			359
	Later Years	—			22			1,618			1,640
	Total	$	61		$	960		$	3,119		$	4,140
	1 Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense.
	2 Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.

Guarantees_Tables

Guarantees (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantees [Abstract]	'
Schedule of Guarantor Obligations [Table Text Block]	'
	The following table presents the notional amount and fair value of Arrow's off-balance sheet commitments to extend credit and commitments under standby letters of credit as of December 31, 2013 and 2012:
	Balance at December 31,	2013		2012
	Notional Amount:
	Commitments to Extend Credit	$	237,940	$	198,405
	Standby Letters of Credit	3,345		10,929
	Fair Value:
	Commitments to Extend Credit	$	—	$	—
	Standby Letters of Credit	65		120

Time_Deposits_Tables

Time Deposits (Tables)	12 Months Ended
	Dec. 31, 2013
Time Deposits [Abstract]	'
Maturities of Time Deposits [Table Text Block]	'
	The following summarizes the contractual maturities of time deposits during years subsequent to December 31, 2013:
	Year of Maturity	Total Time
		Deposits
	2014	$	163,032
	2015	31,277
	2016	17,450
	2017	18,418
	2018	13,076
	2019 and Beyond	3,974
	Total	$	247,227

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Short-term Debt [Table Text Block]	'
	Schedule of Short-Term Borrowings:
		2013			2012
	Balances at December 31:
	Overnight Advances from the Federal Home Loan Bank of New York	$	53,000		$	29,000
	Securities Sold Under Agreements to Repurchase	11,777			12,678
	Total Short-Term Borrowings	$	64,777		$	41,678
	Maximum Borrowing Capacity at December 31:
	Federal Funds Purchased	$	30,000		$	30,000
	Overnight Advances from the Federal Home Loan Bank of New York	214,000			90,000
	Federal Reserve Bank of New York	302,000			268,000
Schedule of Maturities of Long-term Debt [Table Text Block]	'
	Maturity Schedule of FHBLNY Term Advances:
			Balances					Weighted Average Rate
	Final Maturity		2013			2012		2013		2012
	First Year		$	10,000		$	10,000	1.43	%	1.65	%
	Second Year		10,000			10,000		3.88	%	1.43	%
	Third Year		—			10,000		—	%	3.88	%
	Total		$	20,000		$	30,000	2.66	%	2.32	%
Schedule of Long-term Debt Instruments [Table Text Block]	'
	Schedule of Guaranteed Preferred Beneficial Interests in Corporation's Junior Subordinated Debentures
		2013			2012
	ACST II
	Balance at December 31,	$	10,000		$	10,000
	Period-End Interest Rate	3.4		%	3.51		%
	ACST III
	Balance at December 31,	$	10,000		$	10,000
	Period-End Interest Rate	2.25		%	2.36		%

Comprehensive_Income_Tables

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2013
Comprehensive Income [Abstract]	'
Schedule of Comprehensive Income (Loss) [Table Text Block]	'
	The following table presents the components of other comprehensive income for the years ended December 31, 2013, 2012 and 2011:
	Schedule of Comprehensive Income
		Before-Tax				Tax			Net-of-Tax
		Amount				(Expense)			Amount
						Benefit
	2013
	Net Unrealized Securities Holding Gains Arising During the Period	$	(4,843	)		$	1,918		$	(2,925	)
	Reclassification Adjustment for Securities Gains Included in Net Income	(540		)		214			(326		)
	Net Retirement Plan Loss	10,640				(4,215		)	6,425
	Amortization of Net Retirement Plan Actuarial Loss	1,513				(599		)	914
	Accretion of Net Retirement Plan Prior Service Credit	2				(1		)	1
	Other Comprehensive Income	$	6,772			$	(2,683	)	$	4,089
	2012
	Net Unrealized Securities Holding Gains Arising During the Period	$	(1,094	)		$	433		$	(661	)
	Reclassification Adjustment for Securities Gains Included in Net Income	(865		)		343			(522		)
	Net Retirement Plan Loss	(2,218		)		878			(1,340		)
	Net Retirement Plan Prior Service Credit	(405		)		160			(245		)
	Amortization of Net Retirement Plan Actuarial Loss	1,677				(664		)	1,013
	Accretion of Net Retirement Plan Prior Service Credit	(20		)		8			(12		)
	Other Comprehensive Income	$	(2,925	)		$	1,158		$	(1,767	)
	2011
	Net Unrealized Securities Holding Gains Arising During the Period	$	7,850			$	(3,109	)	$	4,741
	Reclassification Adjustment for Securities Gains Included in Net Income	(2,795		)		1,107			(1,688		)
	Net Retirement Plan Loss	(6,129		)		2,428			(3,701		)
	Net Retirement Plan Prior Service Credit	(266		)		105			(161		)
	Amortization of Net Retirement Plan Actuarial Loss	996				(394		)	602
	Accretion of Net Retirement Plan Prior Service Credit	(108		)		43			(65		)
	Other Comprehensive Income	$	(452	)		$	180		$	(272	)
Changes in Accumulated Other Comprehensive Income By Component [Table Text Block]	'
	The following table presents the changes in accumulated other comprehensive income by component:
	Changes in Accumulated Other Comprehensive Income (Loss) by Component (1)
		Unrealized				Defined Benefit Plan Items
		Gains and
		Losses on							Net Prior
		Available-for-				Net Gain			Service
		Sale Securities				(Loss)			(Cost ) Credit			Total
	For the Year-To-Date periods ended:
	31-Dec-12	$	5,625			$	(14,036	)	$	(51	)	$	(8,462	)
	Other comprehensive income (loss) before reclassifications	(2,925		)		6,425			—			3,500
	Amounts reclassified from accumulated other comprehensive income (loss)	(326		)		914			1			589
	Net current-period other comprehensive income	(3,251		)		7,339			1			4,089
	December 31, 2013	$	2,374			$	(6,697	)	$	(50	)	$	(4,373	)
	December 31, 2011	$	6,808			$	(13,709	)	$	206		$	(6,695	)
	Other comprehensive income (loss) before reclassifications	(661		)		(1,340		)	(245		)	(2,246		)
	Amounts reclassified from accumulated other comprehensive income (loss)	(522		)		1,013			(12		)	479
	Net current-period other comprehensive income	(1,183		)		(327		)	(257		)	(1,767		)
	December 31, 2012	$	5,625			$	(14,036	)	$	(51	)	$	(8,462	)
	December 31, 2010	$	3,755			$	(10,610	)	$	432		$	(6,423	)
	Other comprehensive income (loss) before reclassifications	4,741				(3,701		)	(161		)	879
	Amounts reclassified from accumulated other comprehensive income (loss)	(1,688		)		602			(65		)	(1,151		)
	Net current-period other comprehensive income	3,053				(3,099		)	(226		)	(272		)
	December 31, 2011	$	6,808			$	(13,709	)	$	206		$	(6,695	)
	(1) All amounts are net of tax. Amounts in parentheses indicate debits.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	'
	The following table presents the reclassifications out of accumulated other comprehensive income:
	Reclassifications Out of Accumulated Other Comprehensive Income (1)
			Amounts Reclassified
	Details about Accumulated Other		from Accumulated Other				Affected Line Item in the Statement
	Comprehensive Income Components		Comprehensive Income				Where Net Income Is Presented
	For the Year-to-date periods ended:
	December 31, 2013
	Unrealized gains and losses on available-for-sale securities
			$	540			Gain on Securities Transactions, Net
			540				Total before tax
			(214		)		Provision for Income Taxes
			$	326			Net of tax
	Amortization of defined benefit pension items
	Prior-service costs		$	(2	)	(2)	Salaries and Employee Benefits
	Actuarial gains/(losses)		(1,513		)	(2)	Salaries and Employee Benefits
			(1,515		)		Total before tax
			600				Provision for Income Taxes
			$	(915	)		Net of tax
	Total reclassifications for the period		$	(589	)		Net of tax
	December 31, 2012
	Unrealized gains and losses on available-for-sale securities
			$	865			Gain on Securities Transactions, Net
			865				Total before tax
			(343		)		Provision for Income Taxes
			$	522			Net of tax
	Amortization of defined benefit pension items
	Prior-service costs		20			(2)	Salaries and Employee Benefits
	Actuarial gains/(losses)		$	(1,677	)	(2)	Salaries and Employee Benefits
			(1,657		)		Total before tax
			656				Provision for Income Taxes
			$	(1,001	)		Net of tax
	Total reclassifications for the period		$	(479	)		Net of tax
	Reclassifications Out of Accumulated Other Comprehensive Income (1)
			Amounts Reclassified
	Details about Accumulated Other		from Accumulated Other				Affected Line Item in the Statement
	Comprehensive Income Components		Comprehensive Income				Where Net Income Is Presented
	December 31, 2011
	Unrealized gains and losses on available-for-sale securities
			$	2,795			Gain on Securities Transactions, Net
			2,795				Total before tax
			(1,107		)		Provision for Income Taxes
			$	1,688			Net of tax
	Amortization of defined benefit pension items
	Prior-service costs		108			(2)	Salaries and Employee Benefits
	Actuarial gains/(losses)		$	(996	)	(2)	Salaries and Employee Benefits
			(888		)		Total before tax
			351				Provision for Income Taxes
			$	(537	)		Net of tax
	Total reclassifications for the period		$	1,151			Net of tax
	(1) Amounts in parentheses indicate debits to profit/loss.
	(2) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see pension footnote for additional details).

Stock_Based_Compensation_Stock

Stock Based Compensation Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	'
	Roll Forward Schedule of Stock Option Plan by Shares and Weighted Average Exercise Prices
		Stock Option Plans
	Roll Forward of Shares Outstanding:
	Outstanding at January 1, 2013	451,210
	Granted	10,200
	Exercised	(59,612		)
	Forfeited	(12,406		)
	Outstanding at December 31, 2013	389,392
	Exercisable at December 31, 2013	269,758
	Vested and Expected to Vest	119,634
	Roll Forward of Shares Outstanding - Weighted Average Exercise Price:
	Outstanding at January 1, 2013	$	22.67
	Granted	23.8
	Exercised	21.02
	Forfeited	24.71
	Outstanding at December 31, 2013	22.89
	Exercisable at December 31, 2013	22.29
	Vested and Expected to Vest	24.25
	Weighted Average Remaining Contractual Life (in years):
	Outstanding at December 31, 2013	5.57
	Exercisable at December 31, 2013	4.68
	Vested and Expected to Vest	7.58
	Aggregate Intrinsic Value:
	Outstanding at December 31, 2013	$	1,429
	Exercisable at December 31, 2013	1,152
	Vested and Expected to Vest	277
	Shares Available for Grant at Period-End	459,000
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	'
	Schedule of Shares Authorized Under the Stock Option Plan by Exercise Price Range
		Exercise Price Ranges
		$19.08 to $19.87			$21.24 to $22.27			$23.76 to $23.80		$24.43			$25.77		Total
	Outstanding Options at
	31-Dec-13
	Number of Shares Outstanding	85,278			98,376			83,015		75,512			47,211		389,392
	Weighted-Average Remaining Contractual Life (in years)	4.73			5.11			7.34		8.05			0.97		5.57
	Weighted-Average Exercise Price	$	19.64		$	21.95		$	23.77	$	24.43		$	25.77	$	22.89
	Exercisable Options at
	31-Dec-13
	Number of Shares Outstanding	85,278			81,150			36,391		19,728			47,211		269,758
	Weighted-Average Remaining Contractual Life (in years)	4.73			4.9			7.09		7.94			0.97		4.68
	Weighted-Average Exercise Price	$	19.64		$	21.88		$	23.77	$	24.42		$	25.77	$	22.29
Other Stock Based Compensation Disclosure Table [Table Text Block]	'
	Schedule of Other Stock Option Plan Information
			2013				2012			2011
	Shares Granted		10,200				77,302			79,994
	Weighted Average Grant Date Information:
	Fair Value of Options Granted		$	5.46			$	5.89		$	6
	Fair Value Assumptions:
	Dividend Yield		4.2		%		3.93		%	4		%
	Expected Volatility		36.57		%		37.43		%	36.5		%
	Risk Free Interest Rate		1.31		%		1.22		%	2.54		%
	Expected Lives (in years)		6.71				6.46			6.4
	Amount Expensed During the Year		$	372			$	424		$	354
	Compensation Costs for Non-vested Awards Not Yet Recognized		420				737			705
	Weighted Average Expected Vesting Period, In Years		1.45				1.71			1.8
	Proceeds From Stock Options Exercised		$	1,254			$	2,105		$	1,413
	Tax Benefits Related to Stock Options Exercised		23				68			51
	Intrinsic Value of Stock Options Exercised		267				2,434			1,740
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]	'
	Schedule of ESOP Compensation Expense
			2013				2012			2011
	ESOP Compensation Expense		$	600			$	550		$	550
	As the debt is repaid, shares are released from collateral based on the proportion of debt paid to total debt outstanding for the year and allocated to active employees.
	Shares pledged as collateral are reported as unallocated ESOP shares in stockholders’ equity.  As shares are released from collateral, Arrow reports compensation expense equal to the current average market price of the shares, and the shares become outstanding for earnings per share computations.  The ESOP shares as of December 31, 2013 were as follows:
	Schedule of Shares in ESOP Plan
	ESOP Plan Shares:	2013
	Allocated Shares	644,248
	Shares Released for Allocation During 2013	16,969
	Unallocated Shares	87,641
	Total ESOP Shares	748,858
	Market Value of Unallocated Shares	$	2,328

Retirement_Benefit_Plans_Retir

Retirement Benefit Plans Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	'
	The following tables set forth changes in the plans’ benefit obligations (projected benefit obligation for pension benefits and accumulated benefit obligation for postretirement benefits) and changes in the plans’ assets and the funded status of the pension plans and other postretirement benefit plan at December 31:
	Schedule of Defined Benefit Plan Disclosures
		Employees'			Select			Postretirement
		Pension			Executive			Benefit
		Plan			Retirement			Plans
					Plan
	Defined Benefit Plan Funded Status
	31-Dec-13
	Fair Value of Plan Assets	$	44,653		$	—		$	—
	Benefit Obligation	33,259			4,459			7,619
	Funded Status of Plan	$	11,394		$	(4,459	)	$	(7,619	)
	31-Dec-12
	Fair Value of Plan Assets	$	39,880		$	—		$	—
	Benefit Obligation	37,046			5,324			9,213
	Funded Status of Plan	$	2,834		$	(5,324	)	$	(9,213	)
	Change in Benefit Obligation
	Benefit Obligation, at January 1, 2013	$	37,046		$	5,324		$	9,213
	Service Cost	1,506			—			211
	Interest Cost	1,261			163			308
	Plan Participants' Contributions	—			—			368
	Amendments	—			—			—
	Actuarial Gain	(3,820		)	(555		)	(1,648		)
	Benefits Paid	(2,734		)	(473		)	(833		)
	Benefit Obligation, at December 31, 2013	$	33,259		$	4,459		$	7,619
	Schedule of Defined Benefit Plan Disclosures
		Employees'			Select			Postretirement
		Pension			Executive			Benefit
		Plan			Retirement			Plans
					Plan
	Benefit Obligation, at January 1, 2012	$	35,047		$	4,529		$	8,556
	Service Cost	1,467			87			202
	Interest Cost	1,436			190			338
	Plan Participants' Contributions	—			—			348
	Amendments	—			405			—
	Actuarial Loss	2,857			441			491
	Benefits Paid	(3,761		)	(328		)	(722		)
	Benefit Obligation, at December 31, 2012	$	37,046		$	5,324		$	9,213
	Change in Fair Value of Plan Assets
	Fair Value of Plan Assets, at January 1, 2013	$	39,880		$	—		$	—
	Actual Return on Plan Assets	7,507			—			—
	Employer Contributions	—			473			465
	Plan Participants' Contributions	—			—			368
	Benefits Paid	(2,734		)	(473		)	(833		)
	Fair Value of Plan Assets, at December 31, 2013	$	44,653		$	—		$	—
	Change in Fair Value of Plan Assets, continued
	Fair Value of Plan Assets, at January 1, 2012	$	39,206		$	—		$	—
	Actual Return on Plan Assets	4,435			—			—
	Employer Contributions	—			328			374
	Plan Participants' Contributions	—			—			348
	Benefits Paid	(3,761		)	(328		)	(722		)
	Fair Value of Plan Assets, at December 31, 2012	$	39,880		$	—		$	—
	Accumulated Benefit Obligation at December 31, 2013	$	32,886		$	4,459		$	7,619
	Amounts Recognized in the Consolidated Balance Sheets
	31-Dec-13
	Prepaid Pension Asset	$	11,394		$	—		—
	Accrued Benefit Liability	—			(4,459		)	(7,619		)
	Net Benefit Recognized	$	11,394		$	(4,459	)	$	(7,619	)
	31-Dec-12
	Prepaid Pension Asset	$	2,834		$	—		—
	Accrued Benefit Liability	—			(5,324		)	(9,213		)
	Net Benefit Recognized	$	2,834		$	(5,324	)	$	(9,213	)
	Amounts Recognized in Other Comprehensive Income (Loss)
	For the Year Ended December 31, 2013
Net Unamortized Gain Arising During the Period	$	(8,438	)	$	(554	)	$	(1,648	)
Net Prior Service Cost Arising During the Period	—			—			—
Amortization of Net Loss	(1,231		)	(140		)	(142		)
Amortization of Prior Service (Cost) Credit	(37		)	(79		)	114
Total Other Comprehensive (Loss) Income for Pension and	$	(9,706	)	$	(773	)	$	(1,676	)
Other Postretirement Benefit Plans
For the Year Ended December 31, 2012
Net Unamortized Loss Arising During the Period	$	1,286		$	441		$	491
Net Prior Service Cost Arising During the Period	—			405			—
Amortization of Net Loss	(1,387		)	(156		)	(134		)
Amortization of Prior Service (Cost) Credit	(41		)	(53		)	114
Total Other Comprehensive (Loss) Income for Pension and	$	(142	)	$	637		$	471
Other Postretirement Benefit Plans
Schedule of Defined Benefit Plan Disclosures
	Employees'			Select			Postretirement
	Pension			Executive			Benefit
	Plan			Retirement			Plans
				Plan
For the Year Ended December 31, 2011
Net Unamortized Loss Arising During the Period	$	5,474		$	151		$	504
Net Prior Service Cost Arising During the Period	191			75			—
Amortization of Net Loss	(778		)	(147		)	(71		)
Amortization of Prior Service (Cost) Credit	(38		)	32			114
Total Other Comprehensive (Loss) Income for Pension and	$	4,849		$	111		$	547
Other Postretirement Benefit Plans
Accumulated Other Comprehensive Income
31-Dec-13
Net Actuarial Loss	$	8,357		$	1,674		$	1,060
Prior Service (Credit) Cost	(255		)	642			(305		)
Total Accumulated Other Comprehensive Income, Before Tax	$	8,102		$	2,316		$	755
31-Dec-12
Net Actuarial Loss	$	18,026		$	2,368		$	2,850
Prior Service (Credit) Cost	(218		)	721			(419		)
Total Accumulated Other Comprehensive Income, Before Tax	$	17,808		$	3,089		$	2,431
Amounts that will be Amortized from Accumulated
Other Comprehensive Income the Next Year
Net Actuarial Loss	$	345		$	90		$	26
Prior Service (Credit) Cost	$	(45	)	$	72		$	(114	)
Net Periodic Benefit Cost
For the Year Ended December 31, 2013
Service Cost	$	1,506		$	—		$	211
Interest Cost	1,261			163			308
Expected Return on Plan Assets	(2,889		)	—			—
Amortization of Prior Service (Credit) Cost	37			79			(114		)
Amortization of Net Loss	1,232			139			142
Net Periodic Benefit Cost	$	1,147		$	381		$	547
For the Year Ended December 31, 2012
Service Cost	$	1,467		$	87		$	202
Interest Cost	1,436			190			338
Expected Return on Plan Assets	(2,865		)	—			—
Amortization of Prior Service (Credit) Cost	41			53			(114		)
Amortization of Net Loss	1,387			156			134
Net Periodic Benefit Cost	$	1,466		$	486		$	560
For the Year Ended December 31, 2011
Service Cost	$	1,353		$	81		$	173
Interest Cost	1,598			222			372
Expected Return on Plan Assets	(2,793		)	—			—
Amortization of Prior Service (Credit) Cost	38			(32		)	(114		)
Amortization of Net Loss	778			147			71
Net Periodic Benefit Cost	$	974		$	418		$	502
Weighted-Average Assumptions Used in
Calculating Benefit Obligation
31-Dec-13
Discount Rate	5.1		%	4.85		%	5.1		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Schedule of Defined Benefit Plan Disclosures
	Employees'			Select			Postretirement
	Pension			Executive			Benefit
	Plan			Retirement			Plans
				Plan
Interest Rate Credit for Determining	4		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	5.25		%
Balance Account
Interest Rate to Convert Annuities To Actuarially	5.25		%	5.25		%
Equivalent Lump Sum Amounts
31-Dec-12
Discount Rate	3.55		%	3.15		%	3.55		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	3		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	4.5		%
Balance Account
Interest Rate to Convert Annuities To Actuarially	4.5		%	4.5		%
Equivalent Lump Sum Amounts
Weighted-Average Assumptions Used in
Calculating Net Periodic Benefit Cost
31-Dec-13
Discount Rate	3.55		%	3.15		%	3.55		%
Expected Long-Term Return on Plan Assets	7.5		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	3		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	4.5		%
Balance Account
Interest Rate to Convert AnnuitiesTo Actuarially	4.5		%	4.5		%
Equivalent Lump Sum Amounts
31-Dec-12
Discount Rate	4.05		%	4.05		%	4.05		%
Expected Long-Term Return on Plan Assets	7.5		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	3.25		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	5		%
Balance Account
Interest Rate to Convert AnnuitiesTo Actuarially	5		%	5		%
Equivalent Lump Sum Amounts
31-Dec-11
Discount Rate	5.15		%	5.15		%	5.15		%
Expected Long-Term Return on Plan Assets	7.5		%
Rate of Compensation Increase	3.5		%	3.5		%	3.5		%
Interest Rate Credit for Determining	4.25		%
Projected Cash Balance Account
Interest Rate to Annuitize Cash	5.5		%
Balance Account
Interest Rate to Convert AnnuitiesTo Actuarially	5.5		%	5.5		%
Equivalent Lump Sum Amounts
Schedule of Defined Benefit Plan Disclosures
Information about Defined Benefit Plan Assets - Employees' Pension Plan
	Fair Value Measurements Using:
Asset Category	Quoted Prices			Significant Other Observable Inputs			Significant Unobservable Inputs			Total		Percent of Total		Target Allocation Minimum		Target Allocation Maximum
	in Active Markets			(Level 2)			(Level 3)
	for Identical Assets
	(Level 1)
December 31, 2013
Cash	$	7		$	—		$	—		$	7	—	%	—	%	15	%
Interest-Bearing Money Market Fund	3,941			—			—			3,941		8.8	%	—	%	15	%
Arrow Common Stock1	4,291			—			—			4,291		9.6	%	—	%	10	%
North Country Funds - Equity 2	17,419			—			—			17,419		39.1	%
Other Mutual Funds - Equity	14,338			—			—			14,338		32.1	%
Total Equity Funds	31,757			—			—			31,757		71.2	%	55	%	85	%
North Country Funds - Fixed income 2	4,309			—			—			4,309		9.6	%
Other Mutual Funds - Fixed Income	348			—			—			348		0.8	%
Total Fixed Income Funds	4,657			—			—			4,657		10.4	%	10	%	30	%
Total	$	44,653		$	—		$	—		$	44,653	100	%
December 31, 2012
Cash	$	17		$	—		$	—		$	17	—	%	—	%	15	%
Interest-Bearing Money Market Fund	5,236			—			—			5,236		13.1	%	—	%	15	%
Arrow Common Stock	4,197			—			—			4,197		10.5	%	—	%	10	%
North Country Funds - Equity 2	13,043			—			—			13,043		32.8	%
Other Mutual Funds - Equity	11,160			—			—			11,160		28	%
Total Equity Funds	24,203			—			—			24,203		60.8	%	55	%	85	%
North Country Funds - Fixed income 2	4,236			—			—			4,236		10.6	%
Other Mutual Funds - Fixed Income	1,991			—			—			1,991		5	%
Total Fixed Income Funds	6,227			—			—			6,227		15.6	%	10	%	30	%
Total	$	39,880		$	—		$	—		$	39,880	100	%
1 Acquisition of Arrow Financial Corporation common stock was under 10% of the total fair value of the employee's pension plan assets at the time of acquisition.
2 The North Country Funds - Equity and the North Country Funds - Fixed Income are publicly traded mutual funds advised by Arrow's subsidiary, North Country Investment Advisers, Inc.
Schedule of Defined Benefit Plan Disclosures
	Employees'			Select			Postretirement
	Pension			Executive			Benefit
	Plan			Retirement			Plans
				Plan
Expected Future Benefit Payments
2014	$	3,068		$	452		$	510
2015	2,047			440			531
2016	2,344			416			539
2017	2,252			402			549
2018	2,165			388			562
2019-2023	12,516			1,699			3,026
Estimated Contributions During 2014	$	—		$	452		$	510
Assumed Health Care Cost Trend Rates
31-Dec-13
Health Care Cost Trend							8.5		%
Rate Assumed for Next Year
Rate to which the Cost Trend							5		%
Rate is Assumed to Decline
(the Ultimate Trend Rate)
Year that the Rate Reaches							2021
the Ultimate Trend Rate
31-Dec-12
Health Care Cost Trend							9		%
Rate Assumed for Next Year
Rate to which the Cost Trend							5		%
Rate is Assumed to Decline
(the Ultimate Trend Rate)
Year that the Rate Reaches							2021
the Ultimate Trend Rate
Effect of a One-Percentage Point Change in Assumed
Health Care Cost Trend Rates
Effect of a One Percentage Point Increase on							$	59
Service and Interest Cost Components
Effect of a One Percentage Point Decrease on							(49		)
Service and Interest Cost Components
Effect of a One Percentage Point Increase on							557
Accumulated Postretirement Benefit Obligation
Effect of a One Percentage Point Decrease on							(478		)
Accumulated Postretirement Benefit Obligation

Other_Expenses_Tables

Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2013
Other Income and Expenses [Abstract]	'
Other Income and Other Expense Disclosure [Text Block]	'
	Other operating expenses included in the consolidated statements of income are as follows:
		2013		2012		2011
	Computer Services	$	3,261	$	2,263	$	1,654
	Legal and Other Professional Fees	1,823		1,962		1,972
	Postage and Courier	1,046		1,040		1,088
	Stationery and Printing	905		975		891
	Advertising and Promotion	879		831		853
	Telephone and Communications	804		808		981
	Intangible Asset Amortization	452		518		510
	All Other	3,486		3,243		3,095
	Total Other Operating Expense	$	12,656	$	11,640	$	11,044

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	The provision for income taxes is summarized below:
	Current Tax Expense:	2013			2012			2011
	Federal	$	7,933		$	8,763		$	6,726
	State	852			1,251			816
	Total Current Tax Expense	8,785			10,014			7,542
	Deferred Tax Expense (Benefit):
	Federal	172			(290		)	1,775
	State	122			(63		)	397
	Total Deferred Tax Expense (Benefit)	294			(353		)	2,172
	Total Provision for Income Taxes	$	9,079		$	9,661		$	9,714
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	The provisions for income taxes differed from the amounts computed by applying the U.S. Federal Income Tax Rate of 35% for 2013, 2012 and 2011 to pre-tax income as a result of the following:
		2013			2012			2011
	Computed Tax Expense at Statutory Rate	$	10,806		$	11,144		$	11,076
	Increase (Decrease) in Income Taxes Resulting From:
	Tax-Exempt Income	(2,238		)	(2,132		)	(2,199		)
	Nondeductible Interest Expense	80			95			152
	State Taxes, Net of Federal Income Tax Benefit	633			814			788
	Other Items, Net	(202		)	(260		)	(103		)
	Total Provision for Income Taxes	$	9,079		$	9,661		$	9,714
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2013 and 2012 are presented below:
		2013			2012
	Deferred Tax Assets:
	Allowance for Loan Losses	$	5,794		$	6,105
	Pension and Deferred Compensation Plans	3,999			4,140
	Pension Liability Included in Accumulated Other Comprehensive Income	4,426			9,241
	Other	566			608
	Total Gross Deferred Tax Assets	14,785			20,094
	Valuation Allowance for Deferred Tax Assets	—			—
	Total Gross Deferred Tax Assets, Net of Valuation Allowance	$	14,785		$	20,094
	Deferred Tax Liabilities:
	Pension Plans	$	7,724		$	8,178
	Depreciation	1,561			1,475
	Deferred Income	3,526			3,189
	Net Unrealized Gains on Securities Available-for-Sale Included in	1,557			3,690
	Accumulated Other Comprehensive Income
	Goodwill	5,230			5,225
	Total Gross Deferred Tax Liabilities	$	19,598		$	21,757

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
	The following table presents a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per common share ("EPS") for each of the years in the three-year period ended December 31, 2013.  All share and per share amounts have been adjusted for the 2013 2% stock dividend.
	Earnings Per Share
		Year-to-Date Period Ended:
		12/31/13		12/31/12		12/31/11
	Earnings Per Share - Basic:
	Net Income	$	21,795	$	22,179	$	21,933
	Weighted Average Shares - Basic	12,296		12,247		12,209
	Earnings Per Share - Basic	$	1.77	$	1.81	$	1.8
	Earnings Per Share - Diluted:
	Net Income	$	21,795	$	22,179	$	21,933
	Weighted Average Shares - Basic	12,296		12,247		12,209
	Dilutive Average Shares Attributable to Stock Options	31		10		12
	Weighted Average Shares - Diluted	12,327		12,257		12,221
	Earnings Per Share - Diluted	$	1.77	$	1.81	$	1.79
	Antidilutive Shares Excluded from the Calculation	47		203		136
	of Earnings Per Share

Fair_Values_Tables

Fair Values (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	'
	The table below presents the financial instrument's fair value and the amounts within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement:
	Fair Value of Assets and Liabilities Measured on a Recurring and Nonrecurring Basis
		Fair Value Measurements at Reporting Date Using:
	Fair Value of Assets and Liabilities Measured on a Recurring Basis:	Fair Value		Quoted Prices		Significant Other		Significant Unobservable Inputs		Total Gains (Losses)
				In Active Markets for Identical Assets		Observable Inputs		(Level 3)
				(Level 1)		(Level 2)
	December 31, 2013
	Securities Available-for Sale:
	U.S. Agency Obligations	$	136,475	$	—	$	136,475	$	—
	State and Municipal Obligations	127,389		—		127,389		—
	Mortgage-Backed Securities - Residential	175,778		—		175,778		—
	Corporate and Other Debt Securities	16,798		—		16,798		—
	Mutual Funds and Equity Securities	1,166		—		1,166		—
	Total Securities Available-for-Sale	$	457,606	$	—	$	457,606	$	—
	December 31, 2012
	Securities Available-for Sale:
	U.S. Agency Obligations	$	122,457	$	—	$	122,457	$	—
	State and Municipal Obligations	84,838		—		84,838		—
	Mortgage-Backed Securities - Residential	261,804		—		261,804		—
	Corporate and Other Debt Securities	8,451		—		8,451		—
	Mutual Funds and Equity Securities	1,148		—		1,148		—
	Total Securities Available-for Sale	$	478,698	$	—	$	478,698	$	—
	Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
	December 31, 2013
	Other Real Estate Owned and Repossessed Assets, Net	$	144	$	—	$	—	$	144	$	(79	)
	December 31, 2012
	Collateral Dependent Impaired Loans	$	1,020	$	—	$	—	$	1,020	$	(1,021	)
	Other Real Estate Owned and Repossessed Assets, Net	$	1,034	$	—	$	—	$	1,034	$	(19	)
Fair Value, by Balance Sheet Grouping [Table Text Block]	'
	Fair Value by Balance Sheet Grouping
	The following table presents a summary of the carrying amount, the fair value or an amount approximating fair value and the fair value hierarchy of Arrow’s financial instruments:
	Schedule of Fair Values by Balance Sheet Grouping
						Fair Value Hierarchy
		Carrying		Fair		Level 1		Level 2		Level 3
		Amount		Value
	December 31, 2013
	Cash and Cash Equivalents	$	49,980	$	49,980	$	49,980	$	—	$	—
	Securities Available-for-Sale	457,606		457,606		—		457,606		—
	Securities Held-to-Maturity	299,261		302,305		—		302,305		—
	Federal Home Loan Bank and Federal Reserve Bank Stock	6,281		6,281		6,281		—		—
	Net Loans	1,252,038		1,266,020		—		—		1,266,020
	Accrued Interest Receivable	5,745		5,745		5,745		—		—
	Deposits	1,842,330		1,839,613		1,595,103		244,510		—
	Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	11,777		11,777		11,777		—		—
	Federal Home Loan Bank Term Advances	73,000		74,629		53,000		21,629		—
	Junior Subordinated Obligations Issued	20,000		20,000		—		20,000		—
	to Unconsolidated Subsidiary Trusts
	Accrued Interest Payable	439		439		439		—		—
	December 31, 2012
	Cash and Cash Equivalents	$	48,832	$	48,832	$	48,832	$	—	$	—
	Securities Available-for-Sale	478,698		478,698		—		478,698		—
	Securities Held-to-Maturity	239,803		248,252		—		248,252		—
	Federal Home Loan Bank and Federal Reserve Bank Stock	5,792		5,792		5,792		—		—
	Net Loans	1,157,043		1,192,628		—		—		1,192,628
	Accrued Interest Receivable	5,486		5,486		5,486		—		—
	Deposits	1,731,155		1,732,894		1,447,882		285,012		—
	Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	12,678		12,678		12,678		—		—
	Federal Home Loan Bank Term Advances	59,000		60,312		29,000		31,312		—
	Junior Subordinated Obligations Issued	20,000		20,000		—		20,000		—
	to Unconsolidated Subsidiary Trusts
	Accrued Interest Payable	584		584		584		—		—

Leases_Tables

Leases (Tables)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Schedule of Rent Expense [Table Text Block]	'
	Net rental expense for the years ended December 31, 2013, 2012 and 2011 was as follows:
		2013		2012		2011
	Net Rental Expense	$	671	$	597	$	570
Schedule of Future Minimum Rental Payments for Operationg Leases [Table Text Block]	'
	Future minimum lease payments on operating leases at December 31, 2013 were as follows:
		Operating
		Leases
	2014	$	638
	2015	583
	2016	440
	2017	347
	2018	277
	Later Years	448
	Total Minimum Lease Payments	$	2,733

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2013
Banking and Thrift [Abstract]	'
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	'
	Arrow’s and its subsidiary banks’, Glens Falls National Bank and Trust Company (“Glens Falls National”) and Saratoga National Bank and Trust Company (“Saratoga National”), actual capital amounts and ratios are presented in the table below as of December 31, 2013 and 2012:
		Actual				Minimum Amounts For Capital Adequacy Purposes						Minimum Amounts To Be Well-Capitalized
		Amount		Ratio		Amount			Ratio			Amount				Ratio
	As of December 31, 2013:
	Total Capital
	(to Risk Weighted Assets):
	Arrow	$	212,360	15.8	%	$	107,524		8	%		$	134,405			10	%
	Glens Falls National	172,720		15.4	%	89,725			8	%		112,156				10	%
	Saratoga National	33,396		14.8	%	18,052			8	%		22,565				10	%
	Tier I Capital
	(to Risk Weighted Assets):
	Arrow	197,906		14.7	%	53,852			4	%		80,778				6	%
	Glens Falls National	160,849		14.4	%	44,680			4	%		67,020				6	%
	Saratoga National	30,833		13.7	%	9,002			4	%		13,504				6	%
	Tier I Capital
	(to Average Assets):
	Arrow	197,906		9.2	%	86,046			4	%		86,046				4	%
	Glens Falls National	160,849		8.8	%	73,113			4	%		91,391				5	%
	Saratoga National	30,833		9.7	%	12,715			4	%		15,893				5	%
		Actual				Minimum Amounts For Capital					Minimum Amounts To Be Well-Capitalized
						Adequacy Purposes
		Amount		Ratio		Amount		Ratio			Amount			Ratio
	As of December 31, 2012:
	Total Capital
	(to Risk Weighted Assets):
	Arrow	$	200,480	16.3	%	98,395		8	%		122,994			10	%
	Glens Falls National	164,889		16.2	%	81,427		8	%		101,783			10	%
	Saratoga National	31,911		15.1	%	16,906		8	%		21,133			10	%
	Tier I Capital
	(to Risk Weighted Assets):
	Arrow	185,170		15	%	49,379		4	%		74,068			6	%
	Glens Falls National	152,205		14.9	%	40,860		4	%		61,291			6	%
	Saratoga National	29,297		13.8	%	8,492		4	%		12,738			6	%
	Tier I Capital
	(to Average Assets):
	Arrow	185,170		9.1	%	81,393		4	%		81,393			4	%
	Glens Falls National	152,205		8.8	%	69,184		4	%		86,480			5	%
	Saratoga National	29,297		9.4	%	12,467		4	%		15,584			5	%

Parent_Only_Financial_Informat1

Parent Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Schedule of Condensed Financial Statements [Table Text Block]	'
	Condensed financial information for Arrow Financial Corporation is as follows:
	BALANCE SHEETS	December 31,
	ASSETS	2013			2012
	Interest-Bearing Deposits with Subsidiary Banks	$	3,349		$	1,913
	Available-for-Sale Securities	1,166			1,148
	Held-to-Maturity Securities	1,000			1,000
	Investment in Subsidiaries at Equity	206,680			192,985
	Other Assets	5,807			5,339
	Total Assets	$	218,002		$	202,385
	LIABILITIES
	Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	$	20,000		$	20,000
	Other Liabilities	5,848			6,560
	Total Liabilities	25,848			26,560
	STOCKHOLDERS’ EQUITY
	Total Stockholders’ Equity	192,154			175,825
	Total Liabilities and Stockholders’ Equity	$	218,002		$	202,385
	STATEMENTS OF INCOME	Years Ended December 31,
	Income:	2013			2012			2011
	Dividends from Bank Subsidiaries	$	12,900		$	12,700		$	14,450
	Interest and Dividends on Investments	116			123			127
	Other Income (Including Management Fees)	549			776			596
	Net Gains on Securities Transactions	—			63			17
	Total Income	13,565			13,662			15,190
	Expense:
	Interest Expense	640			692			669
	Salaries and Employee Benefits	59			75			92
	Other Expense	860			957			820
	Total Expense	1,559			1,724			1,581
	Income Before Income Tax Benefit and Equity
	in Undistributed Net Income of Subsidiaries	12,006			11,938			13,609
	Income Tax Benefit	634			575			477
	Equity in Undistributed Net Income of Subsidiaries	9,155			9,666			7,847
	Net Income	$	21,795		$	22,179		$	21,933
	The Statement of Changes in Stockholders’ Equity is not reported because it is identical to the Consolidated Statement of Changes in Stockholders’ Equity.
	STATEMENTS OF CASH FLOWS	Years Ended December 31,
		2013			2012			2011
	Cash Flows from Operating Activities:
	Net Income	$	21,795		$	22,179		$	21,933
	Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
	Undistributed Net Income of Subsidiaries	(9,155		)	(9,666		)	(7,847		)
	Net Gains on the Sale of Securities Available-for-Sale	—			(63		)	(17		)
	Shares Issued Under the Directors’ Stock Plan	198			175			175
	Stock-Based Compensation Expense	372			424			354
	Changes in Other Assets and Other Liabilities	(990		)	(1,640		)	(165		)
	Net Cash Provided by Operating Activities	12,220			11,409			14,433
	Cash Flows from Investing Activities:
	Proceeds from the Sale of Securities Available-for-Sale	45			681			410
	Purchases of Securities Available-for-Sale	(45		)	(359		)	(253		)
	Net Cash Provided by Investing Activities	—			322			157
	Cash Flows from Financing Activities:
	Stock Options Exercised	1,254			2,105			1,413
	Shares Issued Under the Employee Stock Purchase Plan	477			484			474
	Shares Issued for Dividend Reinvestment Plans	1,280			1,822			1,796
	Tax Benefit for Exercises of Stock Options	23			68			51
	Purchase of Treasury Stock	(1,709		)	(4,877		)	(6,039		)
	Cash Dividends Paid	(12,109		)	(11,815		)	(11,448		)
	Net Cash Used in Financing Activities	(10,784		)	(12,213		)	(13,753		)
	Net (Decrease) Increase in Cash and Cash Equivalents	1,436			(482		)	837
	Cash and Cash Equivalents at Beginning of the Year	1,913			2,395			1,558
	Cash and Cash Equivalents at End of the Year	$	3,349		$	1,913		$	2,395
	Supplemental Disclosures to Statements of
	Cash Flow Information:
	Interest Paid	$	640		$	692		$	669
Non-cash Investing and Financing Activities:
Shares Issued for Acquisition of Subsidiary	233			233			5,261

Cash_and_Cash_Equivalents_Deta

Cash and Cash Equivalents (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Cash and Cash Equivalents [Abstract]	'	'	'	'
Cash and Due from Banks	$37,275	$37,076	'	'
Interest-Bearing Deposits at Banks	12,705	11,756	'	'
Total Cash and Cash Equivalents	49,980	48,832	43,736	31,079
Total required reserves, including vault cash and Federal Reserve Bank deposits	$18,879	$23,168	'	'

Investment_Securities_Schedule

Investment Securities Schedule of Available for Sale Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	$453,675	$469,384
Available-for-sale Securities	457,606	478,698
Gross Unrealized Gains	5,078	9,843
Gross Unrealized Losses	1,147	529
Available-for-sale Securities, Pledged as Collateral	243,769	260,292
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	59,490	'
From 1 - 5 Years	375,995	'
From 5 - 10 Years	15,274	'
Over 10 Years	1,796	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	59,804	'
From 1 - 5 Years	379,208	'
From 5 - 10 Years	15,827	'
Over 10 Years	1,601	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	113,196	137,839
12 Months of Longer	56,350	7,117
Total	169,546	144,956
Number of Securities in a Continuous Loss Position	165	238
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	656	492
12 Months or Longer	491	37
Total	1,147	529
U.S. Agency Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Gross Unrealized Gains	2	204
Gross Unrealized Losses	395	44
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	136,868	'
From 5 - 10 Years	0	'
Over 10 Years	0	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	136,475	'
From 5 - 10 Years	0	'
Over 10 Years	0	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	60,664	72,531
12 Months of Longer	33,849	0
Total	94,513	72,531
Number of Securities in a Continuous Loss Position	26	22
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	336	44
12 Months or Longer	59	0
Total	395	44
U.S. Agency Obligations [Member] | Agency Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	136,868	122,297
Available-for-sale Securities	136,475	122,457
State and Municipal Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	127,224	84,798
Available-for-sale Securities	127,389	84,838
Gross Unrealized Gains	306	206
Gross Unrealized Losses	141	166
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	48,570	'
From 1 - 5 Years	76,308	'
From 5 - 10 Years	1,666	'
Over 10 Years	680	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	48,623	'
From 1 - 5 Years	76,405	'
From 5 - 10 Years	1,681	'
Over 10 Years	680	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	29,967	46,627
12 Months of Longer	4,597	2,149
Total	34,564	48,776
Number of Securities in a Continuous Loss Position	107	198
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	120	160
12 Months or Longer	21	6
Total	141	166
Mortgage-Backed Securities - Residential [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	171,321	252,480
Available-for-sale Securities	175,778	261,804
Gross Unrealized Gains	4,714	9,405
Gross Unrealized Losses	257	81
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	10,920	'
From 1 - 5 Years	146,677	'
From 5 - 10 Years	13,608	'
Over 10 Years	116	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	11,181	'
From 1 - 5 Years	150,330	'
From 5 - 10 Years	14,146	'
Over 10 Years	121	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	15,190	10,230
12 Months of Longer	11,841	4,968
Total	27,031	15,198
Number of Securities in a Continuous Loss Position	13	7
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	108	50
12 Months or Longer	149	31
Total	257	81
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	31,500	'
Available-for-sale Securities	32,200	'
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	139,800	'
Available-for-sale Securities	143,600	'
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	'	36,400
Available-for-sale Securities	'	37,800
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	'	216,100
Available-for-sale Securities	'	224,000
Corporate and Other Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	17,142	8,689
Available-for-sale Securities	16,798	8,451
Gross Unrealized Gains	10	0
Gross Unrealized Losses	354	238
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	16,142	'
From 5 - 10 Years	0	'
Over 10 Years	1,000	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	15,998	'
From 5 - 10 Years	0	'
Over 10 Years	800	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	7,375	8,451
12 Months of Longer	6,063	0
Total	13,438	8,451
Number of Securities in a Continuous Loss Position	19	11
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	92	238
12 Months or Longer	262	0
Total	354	238
Mututal Funds and Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-For-Sale Securities, at Amortized Cost	1,120	1,120
Available-for-sale Securities	1,166	1,148
Gross Unrealized Gains	46	28
Gross Unrealized Losses	0	0
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	'	'
From 1 - 5 Years	'	'
From 5 - 10 Years	'	'
Over 10 Years	'	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	'	'
From 1 - 5 Years	'	'
From 5 - 10 Years	'	'
Over 10 Years	'	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	0	0
12 Months of Longer	0	0
Total	0	0
Number of Securities in a Continuous Loss Position	0	0
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	0	0
12 Months or Longer	0	0
Total	$0	$0

Investment_Securities_Schedule1

Investment Securities Schedule of Held to Maturity Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity Securities	$299,261	$239,803
Held-to-maturity Securities, at Fair Value	302,305	248,252
Gross Unrealized Gains	4,786	8,512
Gross Unrealized Losses	1,742	63
Held-to-maturity Securities, Pledged as Collateral	298,261	238,803
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	43,043	'
From 1 - 5 Years	123,959	'
From 5 - 10 Years	127,929	'
Over 10 Years	4,330	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	43,113	'
From 1 - 5 Years	125,684	'
From 5 - 10 Years	129,094	'
Over 10 Years	4,414	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	108,972	21,583
12 Months or Longer	5,111	503
Total	114,083	22,086
Number of Securities in a Continuous Loss Position	137	61
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	1,683	62
12 Months or Longer	59	1
Total	1,742	63
State and Municipal Obligations [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity Securities	198,206	183,373
Held-to-maturity Securities, at Fair Value	202,390	191,196
Gross Unrealized Gains	4,762	7,886
Gross Unrealized Losses	578	63
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	43,043	'
From 1 - 5 Years	82,001	'
From 5 - 10 Years	69,832	'
Over 10 Years	3,330	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	43,113	'
From 1 - 5 Years	83,896	'
From 5 - 10 Years	71,967	'
Over 10 Years	3,414	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	23,633	21,583
12 Months or Longer	5,111	503
Total	28,744	22,086
Number of Securities in a Continuous Loss Position	101	61
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	519	62
12 Months or Longer	59	1
Total	578	63
Mortgage-Backed Securities - Residential [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity Securities	100,055	'
Held-to-maturity Securities, at Fair Value	98,915	'
Gross Unrealized Gains	24	626
Gross Unrealized Losses	1,164	0
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	41,958	'
From 5 - 10 Years	58,097	'
Over 10 Years	0	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	41,788	'
From 5 - 10 Years	57,127	'
Over 10 Years	0	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	85,339	0
12 Months or Longer	0	0
Total	85,339	0
Number of Securities in a Continuous Loss Position	36	0
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	1,164	0
12 Months or Longer	0	0
Total	1,164	0
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity Securities	95,200	55,430
Held-to-maturity Securities, at Fair Value	94,200	56,056
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity Securities	4,900	'
Held-to-maturity Securities, at Fair Value	4,700	'
Corporate and Other Debt Securities [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity Securities	1,000	1,000
Held-to-maturity Securities, at Fair Value	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Maturities of Debt Securities, at Amortized Cost [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	0	'
From 5 - 10 Years	0	'
Over 10 Years	1,000	'
Maturities of Debt Securities, at Fair Value [Abstract]	'	'
Within One Year	0	'
From 1 - 5 Years	0	'
From 5 - 10 Years	0	'
Over 10 Years	1,000	'
Securities in a Continuous Loss Position, at Fair Value [Abstract]	'	'
Less than 12 Months	0	0
12 Months or Longer	0	0
Total	0	0
Number of Securities in a Continuous Loss Position	0	0
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]	'	'
Less than 12 Months	0	0
12 Months or Longer	0	0
Total	$0	$0

Investment_Securities_CostMeth

Investment Securities Cost-Method Investments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments, All Other Investments [Abstract]	'	'
Federal Reserve Bank Stock	$1,035	$1,018
Federal Home Loan Bank Stock	5,246	4,774
Federal Home Loan Bank and Federal Reserve Bank Stock	$6,281	$5,792

Loans_Loan_Categories_and_Past

Loans Loan Categories and Past Due Loans(Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	$4,303	$4,456
Loans Past Due 60 - 89 Days	4,388	6,196
Loans Past Due 90 or More Days	5,422	4,012
Total Loans Past Due	14,113	14,664
Current Loans	1,252,359	1,157,677
Total Loans	1,266,472	1,172,341
Loans 90 or More Days Past Due and Still Accruing Interest	652	920
Nonaccrual Loans	6,479	6,633
Commercial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	304	1,045
Loans Past Due 60 - 89 Days	601	1,588
Loans Past Due 90 or More Days	177	494
Total Loans Past Due	1,082	3,127
Current Loans	86,811	102,409
Total Loans	87,893	105,536
Loans 90 or More Days Past Due and Still Accruing Interest	28	126
Nonaccrual Loans	352	1,787
Commercial Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	0	0
Loans Past Due 60 - 89 Days	0	0
Loans Past Due 90 or More Days	0	0
Total Loans Past Due	0	0
Current Loans	27,815	29,149
Total Loans	27,815	29,149
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	0	0
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	200	534
Loans Past Due 60 - 89 Days	1,200	1,332
Loans Past Due 90 or More Days	2,034	1,871
Total Loans Past Due	3,434	3,737
Current Loans	284,685	241,440
Total Loans	288,119	245,177
Loans 90 or More Days Past Due and Still Accruing Interest	0	378
Nonaccrual Loans	2,048	2,026
Other Consumer [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	37	43
Loans Past Due 60 - 89 Days	19	17
Loans Past Due 90 or More Days	0	0
Total Loans Past Due	56	60
Current Loans	7,593	6,624
Total Loans	7,649	6,684
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	0	1
Automobile [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	3,233	2,427
Loans Past Due 60 - 89 Days	1,041	793
Loans Past Due 90 or More Days	98	185
Total Loans Past Due	4,372	3,405
Current Loans	389,832	345,695
Total Loans	394,204	349,100
Loans 90 or More Days Past Due and Still Accruing Interest	0	42
Nonaccrual Loans	219	419
Residential [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans Past Due 30 - 59 Days	529	407
Loans Past Due 60 - 89 Days	1,527	2,466
Loans Past Due 90 or More Days	3,113	1,462
Total Loans Past Due	5,169	4,335
Current Loans	455,623	432,360
Total Loans	460,792	436,695
Loans 90 or More Days Past Due and Still Accruing Interest	624	374
Nonaccrual Loans	$3,860	$2,400

Loans_Allowance_for_Loan_Losse

Loans Allowance for Loan Losses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	$15,298	$15,003	$14,689
Charge-offs	-1,411	-782	-774
Recoveries	347	232	243
Provision	200	845	845
Allowance for Credit Losses, Ending Balance	14,434	15,298	15,003
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	853	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	14,434	14,445	'
Ending Loan Balance - Individually Evaluated for Impairment	4,488	5,253	'
Ending Loan Balance - Collectively Evaluated for Impairment	1,261,984	1,167,088	'
Commercial [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	2,344	1,927	2,037
Charge-offs	-926	-90	-105
Recoveries	88	23	17
Provision	380	484	-22
Allowance for Credit Losses, Ending Balance	1,886	2,344	1,927
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	853	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	1,886	1,491	'
Ending Loan Balance - Individually Evaluated for Impairment	221	1,432	'
Ending Loan Balance - Collectively Evaluated for Impairment	87,672	104,104	'
Commercial Construction [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	601	602	135
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	-184	-1	467
Allowance for Credit Losses, Ending Balance	417	601	602
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	0	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	417	601	'
Ending Loan Balance - Individually Evaluated for Impairment	0	0	'
Ending Loan Balance - Collectively Evaluated for Impairment	27,815	29,149	'
Commercial Real Estate [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	3,050	3,136	2,993
Charge-offs	-11	-206	0
Recoveries	0	0	0
Provision	506	120	143
Allowance for Credit Losses, Ending Balance	3,545	3,050	3,136
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	0	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	3,545	3,050	'
Ending Loan Balance - Individually Evaluated for Impairment	1,785	2,528	'
Ending Loan Balance - Collectively Evaluated for Impairment	286,334	242,649	'
Other Consumer [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	304	350	328
Charge-offs	-28	-52	-42
Recoveries	3	9	28
Provision	-7	-3	36
Allowance for Credit Losses, Ending Balance	272	304	350
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	0	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	272	304	'
Ending Loan Balance - Individually Evaluated for Impairment	0	0	'
Ending Loan Balance - Collectively Evaluated for Impairment	7,649	6,684	'
Automobile [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	4,536	4,496	4,760
Charge-offs	-431	-401	-480
Recoveries	256	200	198
Provision	-155	241	18
Allowance for Credit Losses, Ending Balance	4,206	4,536	4,496
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	0	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	4,206	4,536	'
Ending Loan Balance - Individually Evaluated for Impairment	173	203	'
Ending Loan Balance - Collectively Evaluated for Impairment	394,031	348,897	'
Residential [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	3,405	3,414	3,163
Charge-offs	-15	-33	-147
Recoveries	0	0	0
Provision	-364	24	398
Allowance for Credit Losses, Ending Balance	3,026	3,405	3,414
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	0	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	3,026	3,405	'
Ending Loan Balance - Individually Evaluated for Impairment	2,309	1,090	'
Ending Loan Balance - Collectively Evaluated for Impairment	458,483	435,605	'
Unallocated [Member]	'	'	'
Rollfoward of the Allowance for Loan Losses [Roll Forward]	'	'	'
Allowance for Credit Losses, Beginning Balance	1,058	1,078	1,273
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	24	-20	-195
Allowance for Credit Losses, Ending Balance	1,082	1,058	1,078
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]	'	'	'
Allowance for Loan Losses - Loans Individually Evaluated for Impairment	0	0	'
Allowance for Loan Losses - Loans Collectively Evaluated for Impairment	1,082	1,058	'
Ending Loan Balance - Individually Evaluated for Impairment	0	0	'
Ending Loan Balance - Collectively Evaluated for Impairment	$0	$0	'

Loans_Loan_Credit_Quality_Indi

Loans Loan Credit Quality Indicators (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Satisfactory [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	$375,393	$350,310
Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	838	1,611
Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	27,596	26,554
Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	1,387
Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	857,942	789,281
Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	4,703	3,198
Commercial [Member] | Satisfactory [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	79,966	97,085
Commercial [Member] | Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	204	192
Commercial [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	7,723	6,872
Commercial [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	1,387
Commercial Construction [Member] | Satisfactory [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	27,815	27,913
Commercial Construction [Member] | Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	0
Commercial Construction [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	1,236
Commercial Construction [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	0
Commercial Real Estate [Member] | Satisfactory [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	267,612	225,312
Commercial Real Estate [Member] | Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	634	1,419
Commercial Real Estate [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	19,873	18,446
Commercial Real Estate [Member] | Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	0
Other Consumer [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	7,649	6,683
Other Consumer [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	0	1
Automobile [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	393,985	348,676
Automobile [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	219	424
Residential [Member] | Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	456,308	433,922
Residential [Member] | Nonperforming [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Financing Receivable, Net	$4,484	$2,773

Loans_Impaired_Loans_Details

Loans Impaired Loans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	$4,488	$3,866	'
With a Related Allowance	0	1,387	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	4,488	4,033	'
With a Related Allowance	0	1,387	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	4,178	4,132	3,640
With a Related Allowance	694	694	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	21	91	74
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	64	42
With a Related Allowance	0	0	'
Commercial [Member]	'	'	'
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	221	45	'
With a Related Allowance	0	1,387	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	221	45	'
With a Related Allowance	0	1,387	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	133	56	40
With a Related Allowance	694	694	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	4	6	6
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Commercial Construction [Member]	'	'	'
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	0	0	'
With a Related Allowance	0	0	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	0	0	'
With a Related Allowance	0	0	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Commercial Real Estate [Member]	'	'	'
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	1,785	2,528	'
With a Related Allowance	0	0	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	1,785	2,695	'
With a Related Allowance	0	0	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	2,157	2,241	1,993
With a Related Allowance	0	0	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	0	64	42
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	64	42
With a Related Allowance	0	0	'
Other Consumer [Member]	'	'	'
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	0	0	'
With a Related Allowance	0	0	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	0	0	'
With a Related Allowance	0	0	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	0	0	5
With a Related Allowance	0	0	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Automobile [Member]	'	'	'
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	173	203	'
With a Related Allowance	0	0	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	173	203	'
With a Related Allowance	0	0	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	188	236	274
With a Related Allowance	0	0	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	9	12	19
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	0	0	'
Residential [Member]	'	'	'
Recorded Investment [Abstract]	'	'	'
With No Related Allowance	2,309	1,090	'
With a Related Allowance	0	0	'
Unpaid Principal Balance [Abstract]	'	'	'
With No Related Allowance	2,309	1,090	'
With a Related Allowance	0	0	'
Average Recorded Balance [Abstract]	'	'	'
With No Related Allowance	1,700	1,599	1,328
With a Related Allowance	0	0	'
Interest Income Recognized [Abstract]	'	'	'
With No Related Allowance	8	9	7
With a Related Allowance	0	0	'
Cash Basis Income [Abstract]	'	'	'
With No Related Allowance	0	0	0
With a Related Allowance	$0	$0	'

Loans_Loans_Modified_in_Troubl

Loans Loans Modified in Trouble Debt Restructurings (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	10	19	17
Pre-Modification Outstanding Recorded Investment	$257	$207	$1,343
Post-Modification Outstanding Recorded Investment	288	207	1,343
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	0	0	0
Commercial [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	1	0	1
Pre-Modification Outstanding Recorded Investment	169	0	63
Post-Modification Outstanding Recorded Investment	200	0	63
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	0	0	0
Commercial Construction [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	0	0	0
Commercial Real Estate [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	0	2	1
Pre-Modification Outstanding Recorded Investment	0	47	917
Post-Modification Outstanding Recorded Investment	0	47	917
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	0	0	0
Other Consumer [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	0	0	0
Automobile [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	9	17	14
Pre-Modification Outstanding Recorded Investment	88	160	121
Post-Modification Outstanding Recorded Investment	88	160	121
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	0	0	0
Residential [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Loans	0	0	1
Pre-Modification Outstanding Recorded Investment	0	0	242
Post-Modification Outstanding Recorded Investment	0	0	242
Subsequent Default, Number of Contracts	0	0	0
Subsequent Default, Recorded Investment	0	0	0
Commitments to lend additional funds to modified loans	$0	$0	$0

Loans_Supplemental_Loan_Inform

Loans Supplemental Loan Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Other Information [Abstract]	'	'
Unamortized Deferred Loan Origination Costs, Net of Deferred Loan Origination Fees	$2,152	$1,571
Overdrawn Deposit Accounts	501	690
Pledged loans secured by one-to-four family residential mortgages under a blanket collateral agreement to secure borrowings from the Federal Home Loans Bank of New York	270,372	133,709
Residential Real Estate Loans Serviced for Freddie Mac	156,593	134,688
Loans Held for Sale at Period End	64	2,801
Loans to Related Parties [Roll Forward]	'	'
Balance at beginning of year	17,447	15,772
Adjustment due to change in composition of related parties	-8,819	45
New loans and renewals, during the year	2,253	5,939
Repayments, during the year	-3,112	-4,309
Balance at end of year	$7,769	$17,447

Premises_and_Equipment_Details

Premises and Equipment (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Total Cost	$57,155	$54,988
Accumulated Depreciation and Amortization	-28,001	-26,091
Net Premises and Equipment	29,154	28,897
Land and Bank Premises [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total Cost	35,114	33,908
Equipment, Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total Cost	20,851	20,123
Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total Cost	$1,190	$957

Premises_and_Equipment_Supplem

Premises and Equipment Supplemental Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Depreciation Expense	$1,928	$1,521	$1,382

Other_Intangible_Assets_Schedu

Other Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Other Intangible Assets [Line Items]	'		'		'
Gross Carrying Amount	$8,280		$7,949		'
Accumulated Amortization	-4,140		-3,457		'
Net Carrying Amount	4,140		4,492		4,749
Other Intangible Assets [Roll Forward]	'		'		'
Finite-Lived Intangible Assets, Beginning Balance	4,492		4,749		1,458
Intangible Assets Acquired	331		417		3,912
Amortization of Intangible Assets	-683		-674		-621
Finite-Lived Intangible Assets, Ending Balance	4,140		4,492		4,749
Depositor Intangibles [Member]	'		'		'
Other Intangible Assets [Line Items]	'		'		'
Gross Carrying Amount	2,247	[1]	2,247	[1]	'
Accumulated Amortization	-2,186	[1]	-2,094	[1]	'
Net Carrying Amount	61	[1]	153	[1]	286	[1]
Other Intangible Assets [Roll Forward]	'		'		'
Finite-Lived Intangible Assets, Beginning Balance	153	[1]	286	[1]	460	[1]
Intangible Assets Acquired	0	[1]	0	[1]	0	[1]
Amortization of Intangible Assets	-92	[1]	-133	[1]	-174	[1]
Finite-Lived Intangible Assets, Ending Balance	61	[1]	153	[1]	286	[1]
Mortgage Servicing Rights [Member]	'		'		'
Other Intangible Assets [Line Items]	'		'		'
Gross Carrying Amount	1,582	[2]	1,251	[2]	'
Accumulated Amortization	-622	[2]	-392	[2]	'
Net Carrying Amount	960	[2]	859	[2]	599	[2]
Other Intangible Assets [Roll Forward]	'		'		'
Finite-Lived Intangible Assets, Beginning Balance	859	[2]	599	[2]	371	[2]
Intangible Assets Acquired	331	[2]	417	[2]	339	[2]
Amortization of Intangible Assets	-230	[2]	-157	[2]	-111	[2]
Finite-Lived Intangible Assets, Ending Balance	960	[2]	859	[2]	599	[2]
Customer Intangibles [Member]	'		'		'
Other Intangible Assets [Line Items]	'		'		'
Gross Carrying Amount	4,451	[1]	4,451	[1]	'
Accumulated Amortization	-1,332	[1]	-971	[1]	'
Net Carrying Amount	3,119	[1]	3,480	[1]	3,864	[1]
Other Intangible Assets [Roll Forward]	'		'		'
Finite-Lived Intangible Assets, Beginning Balance	3,480	[1]	3,864	[1]	627	[1]
Intangible Assets Acquired	0	[1]	0	[1]	3,573	[1]
Amortization of Intangible Assets	-361	[1]	-384	[1]	-336	[1]
Finite-Lived Intangible Assets, Ending Balance	$3,119	[1]	$3,480	[1]	$3,864	[1]
[1]	Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense.
[2]	Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.

Other_Intangible_Assets_Schedu1

Other Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
In Thousands, unless otherwise specified
Estimated Annual Amoritzation Expense: [Abstract]	'		'		'		'
2014	$641		'		'		'
2015	559		'		'		'
2016	510		'		'		'
2017	431		'		'		'
2018	359		'		'		'
Later Years	1,640		'		'		'
Net Carrying Amount	4,140		4,492		4,749		1,458
Depositor Intangibles [Member]	'		'		'		'
Estimated Annual Amoritzation Expense: [Abstract]	'		'		'		'
2014	51	[1]	'		'		'
2015	10	[1]	'		'		'
2016	0	[1]	'		'		'
2017	0	[1]	'		'		'
2018	0	[1]	'		'		'
Later Years	0	[1]	'		'		'
Net Carrying Amount	61	[1]	153	[1]	286	[1]	460	[1]
Mortgage Servicing Rights [Member]	'		'		'		'
Estimated Annual Amoritzation Expense: [Abstract]	'		'		'		'
2014	253	[2]	'		'		'
2015	230	[2]	'		'		'
2016	209	[2]	'		'		'
2017	150	[2]	'		'		'
2018	96	[2]	'		'		'
Later Years	22	[2]	'		'		'
Net Carrying Amount	960	[2]	859	[2]	599	[2]	371	[2]
Customer Intangibles [Member]	'		'		'		'
Estimated Annual Amoritzation Expense: [Abstract]	'		'		'		'
2014	337	[1]	'		'		'
2015	319	[1]	'		'		'
2016	301	[1]	'		'		'
2017	281	[1]	'		'		'
2018	263	[1]	'		'		'
Later Years	1,618	[1]	'		'		'
Net Carrying Amount	$3,119	[1]	$3,480	[1]	$3,864	[1]	$627	[1]
[1]	Amortization of depositor intangibles and customer intangibles are reported in the consolidated statements of income as a component of other operating expense.
[2]	Amortization of mortgage servicing rights is reported in the consolidated statements of income as a reduction of mortgage servicing fee income, which is included with fees for other services to customers.

Guarantees_Details

Guarantees (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Commitments to Extend Credit [Member]	'	'
Guarantees [Line Items]	'	'
Notional Amount	$237,940	$198,405
Fair Value	0	0
Standby Letters of Credit [Member]	'	'
Guarantees [Line Items]	'	'
Notional Amount	3,345	10,929
Fair Value	$65	$120

Time_Deposits_Details

Time Deposits (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Year of Maturity	'
2014	$163,032
2015	31,277
2016	17,450
2017	18,418
2018	13,076
2019 and Beyond	3,974
Total	$247,227

Debt_Schedule_of_Short_Term_De

Debt Schedule of Short Term Debt (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Short-term Debt [Line Items]	'	'
Short-term Borrowings	$64,777	$41,678
Overnight Advances from the Federal Home Loan Bank of New York [Member]	'	'
Short-term Debt [Line Items]	'	'
Short-term Borrowings	53,000	29,000
Maximum Borrowing Capacity	214,000	90,000
Securities Sold under Agreements to Repurchase [Member]	'	'
Short-term Debt [Line Items]	'	'
Short-term Borrowings	11,777	12,678
Federal Funds Purchased [Member]	'	'
Short-term Debt [Line Items]	'	'
Maximum Borrowing Capacity	30,000	30,000
Federal Reserve Bank of New York [Member]	'	'
Short-term Debt [Line Items]	'	'
Maximum Borrowing Capacity	$302,000	$268,000

Debt_Maturities_of_Long_Term_D

Debt Maturities of Long Term Debt (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Long-term Debt, Fiscal Year Maturity [Abstract]	'	'
Final Maturity Balances - First Year	$10,000	$10,000
Final Maturity Balances - Second Year	10,000	10,000
Final Maturity Balances - Third Year	0	10,000
Final Maturity Balances - Total	$20,000	$30,000
Final Maturity Weighted Average Rate - First Year	1.43%	1.65%
Final Maturity Weighted Average Rate - Second Year	3.88%	1.43%
Final Maturity Weighted Average Rate - Third Year	0.00%	3.88%
Final Maturity Weighted Average Rate - Total	2.66%	2.32%

Debt_Schedule_of_Longterm_Debt

Debt Schedule of Long-term Debt instruments (Details) (Junior Subordinated Debt [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ACST II [Member]	'	'
Debt Instrument [Line Items]	'	'
Balance at December 31,	$10,000	$10,000
Period-End Interest Rate	3.40%	3.51%
ACST III [Member]	'	'
Debt Instrument [Line Items]	'	'
Balance at December 31,	$10,000	$10,000
Period-End Interest Rate	2.25%	2.36%

Comprehensive_Income_Other_Com

Comprehensive Income Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Comprehensive Income [Line Items]	'	'	'
Other Comprehensive Income (Loss), Net of Tax	$3,500	($2,246)	$879
Reclassification from Accumulated Other Comprehensive Income	589	479	-1,151
Other Comprehensive Income (Loss), before Tax	6,772	-2,925	-452
Other Comprehensive Income (Loss), Tax	-2,683	1,158	180
Other Comprehensive (Loss) Income	4,089	-1,767	-272
Unrealized Gains and Losses on Available for Sale Securities	'	'	'
Schedule of Comprehensive Income [Line Items]	'	'	'
Other Comprehensive Income (Loss), before Reclassifications, before Tax	-4,843	-1,094	7,850
Other Comprehensive Income Loss Before Reclassifications Tax (Expense) Benefit	1,918	433	-3,109
Other Comprehensive Income (Loss), Net of Tax	-2,925	-661	4,741
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	-540	-865	-2,795
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	214	343	1,107
Reclassification from Accumulated Other Comprehensive Income	-326	-522	-1,688
Other Comprehensive (Loss) Income	-3,251	-1,183	3,053
Defined Benefit Plans, Net Gain (Loss) [Member]	'	'	'
Schedule of Comprehensive Income [Line Items]	'	'	'
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	10,640	-2,218	-6,129
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	-4,215	878	2,428
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Unamortized Gain (Loss)	6,425	-1,340	-3,701
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,513	1,677	996
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	-599	-664	-394
Reclassification from Accumulated Other Comprehensive Income	914	1,013	602
Other Comprehensive (Loss) Income	7,339	-327	-3,099
Defined Benefit Plans, Net Prior Service Cost (Credit) [Member]	'	'	'
Schedule of Comprehensive Income [Line Items]	'	'	'
Net Prior Service Cost Arising During the Period	'	-405	-266
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax	'	160	105
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Prior Service (Cost) Credit	0	-245	-161
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	-20	-108
Reclassification From Accumulated Other Comprehensive Income Current Period Tax (Expense) Benefit	-1	8	43
Reclassification from Accumulated Other Comprehensive Income	1	-12	-65
Other Comprehensive (Loss) Income	$1	($257)	($226)

Comprehensive_Income_Changes_i

Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated Other Comprehensive Loss	($4,373)	($8,462)	($6,695)	($6,423)
Other Comprehensive Income (Loss), Net of Tax	3,500	-2,246	879	'
Reclassification from Accumulated Other Comprehensive Income	589	479	-1,151	'
Other Comprehensive (Loss) Income	4,089	-1,767	-272	'
Unrealized Gains and Losses on Available for Sale Securities	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated Other Comprehensive Loss	2,374	5,625	6,808	3,755
Other Comprehensive Income (Loss), Net of Tax	-2,925	-661	4,741	'
Reclassification from Accumulated Other Comprehensive Income	-326	-522	-1,688	'
Other Comprehensive (Loss) Income	-3,251	-1,183	3,053	'
Defined Benefit Plans, Net Gain (Loss) [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated Other Comprehensive Loss	-6,697	-14,036	-13,709	-10,610
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Unamortized Gain (Loss)	6,425	-1,340	-3,701	'
Reclassification from Accumulated Other Comprehensive Income	914	1,013	602	'
Other Comprehensive (Loss) Income	7,339	-327	-3,099	'
Defined Benefit Plans, Net Prior Service Cost (Credit) [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated Other Comprehensive Loss	-50	-51	206	432
Other Comprehensive Income (Loss), Net of Tax, Defined Benefit Plan Net Prior Service (Cost) Credit	0	-245	-161	'
Reclassification from Accumulated Other Comprehensive Income	1	-12	-65	'
Other Comprehensive (Loss) Income	$1	($257)	($226)	'

Comprehensive_Income_Reclassif

Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'	'
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$30,874	$31,840	$31,647
Income Tax Expense (Benefit)	9,079	9,661	9,714
Net Income	21,795	22,179	21,933
Total Reclassifications out of Accumulated Other Comprehensive Income	-589	-479	1,151
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available for Sale Securities	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	540	865	2,795
Income (Loss) from Continuing Operations before Income Taxes, Domestic	540	865	2,795
Income Tax Expense (Benefit)	-214	-343	-1,107
Net Income	326	522	1,688
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]	'	'	'
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	-2	20	108
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	-1,513	-1,677	-996
Income (Loss) from Continuing Operations before Income Taxes, Domestic	-1,515	-1,657	-888
Income Tax Expense (Benefit)	600	656	351
Net Income	($915)	($1,001)	($537)

Stock_Based_Compensation_Roll_

Stock Based Compensation Roll Forward Schedule of Stock Option Plan by Shares and Weighted Average Exercise Prices (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Roll Forward of Shares Outstanding [Roll Forward]	'	'	'
Outstanding, Beginning Balance, in shares	451,210	'	'
Granted, in shares	10,200	77,302	79,994
Exercised, in shares	-59,612	'	'
Forfeited, in shares	-12,406	'	'
Outstanding, Ending Balance, in shares	389,392	451,210	'
Exercisable at Period End, in shares	269,758	'	'
Vested and Expected to Vest, in shares	119,634	'	'
Roll Forward of Shares Outstanding - Weighted Average Exercise Price: [Roll Forward]	'	'	'
Outstanding, Beginning Balance, in Weighted Average Exercise Price,	$22.67	'	'
Granted, in Weighted Average Exercise Price	$23.80	'	'
Exercised, in Weighted Average Exercise Price	$21.02	'	'
Forfeited, in Weighted Average Exercise Price	$24.71	'	'
Outstanding, Ending Balance, in Weighted Average Exercise Price,	$22.89	$22.67	'
Exercisable at Period End, in Weighted Average Exercise Price	$22.29	'	'
Vested and Expected to Vest, in Weighted Average Exercise Price	$24.25	'	'
Outstanding at Period End, Weighted Average Remaining Contractual Life, in years	'5 years 6 months 26 days	'	'
Exercisable at Period End, Weighted Average Remaining Contractual Life, in years	'4 years 8 months 5 days	'	'
Vested and Expected to Vest, Weighted Average Remaining Contractual Life, in years	'7 years 7 months	'	'
Outstanding at Period End, Aggregate Intrinsic Value	$1,429	'	'
Exercisable at Period End, Aggregate Intrinsic Value	1,152	'	'
Vested and Expected to Vest, Aggregate Intrinsic Value	$277	'	'
Shares Available for Grant at Period End, in shares	459,000	'	'

Stock_Based_Compensation_Sched

Stock Based Compensation Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Shares Outstanding, Outstanding Options, in shares	389,392
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	'5 years 6 months 27 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$22.89
Number of Shares Outstanding, Exercisable Options, in shares	269,758
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	'4 years 8 months 5 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$22.29
Exercise Price Range $19.08 to $19.87 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Shares Outstanding, Outstanding Options, in shares	85,278
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	'4 years 8 months 22 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$19.64
Number of Shares Outstanding, Exercisable Options, in shares	85,278
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	'4 years 8 months 22 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$19.64
Exercise Price Range $21.24 to $22.27 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Shares Outstanding, Outstanding Options, in shares	98,376
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	'5 years 1 month 11 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$21.95
Number of Shares Outstanding, Exercisable Options, in shares	81,150
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	'4 years 10 months 25 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$21.88
Exercise Price Range $23.76 to $23.80 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Shares Outstanding, Outstanding Options, in shares	83,015
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	'7 years 4 months 3 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$23.77
Number of Shares Outstanding, Exercisable Options, in shares	36,391
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	'7 years 1 month 3 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$23.77
Exercise Price Range $24.43 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Shares Outstanding, Outstanding Options, in shares	75,512
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	'8 years 0 months 19 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$24.43
Number of Shares Outstanding, Exercisable Options, in shares	19,728
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	'7 years 11 months 10 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$24.42
Exercise Price Range $25.77 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Shares Outstanding, Outstanding Options, in shares	47,211
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	'0 years 11 months 20 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$25.77
Number of Shares Outstanding, Exercisable Options, in shares	47,211
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	'0 years 11 months 20 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$25.77

Stock_Based_Compensation_Sched1

Stock Based Compensation Schedule of Other Stock Option Plan Information (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]	'	'	'
Granted, in shares	10,200	77,302	79,994
Fair Value of Options Granted, Weighted Average Grant Date, in dollars per share	$5.46	$5.89	$6
Dividend Yield	4.20%	3.93%	4.00%
Expected Volatility	36.57%	37.43%	36.50%
Risk Free Interest Rate	1.31%	1.22%	2.54%
Expected Life, in years	'6 years 8 months 15 days	'6 years 5 months 16 days	'6 years 4 months 25 days
Stock-Based Compensation Expense	$372	$424	$354
Compensation Costs for Non-vested Awards Not Yet Recognized	420	737	705
Weighted Average Expected Vesting Period, In Years	'1 year 5 months 13 days	'1 year 8 months 15 days	'1 year 9 months 18 days
Proceeds From Stock Options Exercised	1,254	2,105	1,413
Tax Benefit for Exercises of Stock Options	23	68	51
Intrinsic Value of Stock Options Exercised	$267	$2,434	$1,740

Stock_Based_Compensation_Sched2

Stock Based Compensation Schedule of Employee Stock Ownership Plans (ESOP) Disclosure (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]	'	'	'
ESOP Compensation Expense	$600	$550	$550
Allocated Shares, in shares	644,248	'	'
Shares Released for Allocation During Year, in shares	16,969	'	'
Unallocated Shares, in shares	87,641	'	'
Total ESOP Shares, in shares	748,858	'	'
Market Value of Unallocated ESOP Shares	$2,328	'	'

Retirement_Benefit_Plans_Detai

Retirement Benefit Plans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	$44,653		$39,880		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	39,880		'		'
Contributions to Pension Plans	'	-473		-328		-5,319
Fair Value of Plan Assets, End of Period	'	44,653		39,880		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	44,653		39,880		'
Percent of Total	'	100.00%		100.00%		'
Expected Future Benefit Payments [Abstract]	'	'		'		'
Health Care Cost Trend Rate Assumed for Next Year	'	8.50%		9.00%		'
Rate to which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate)	'	5.00%		5.00%		'
Year that the Rate Reaches the Ultimate Trend Rate	'	'2021		'2021		'
Effect of One Percentage Point Increase on Service and Interest Cost Components	'	59		'		'
Effect of One Percentage Point Decrease on Service and Interest Cost Components	'	-49		'		'
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	'	557		'		'
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	'	-478		'		'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	44,653		39,880		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	44,653		39,880		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	44,653		39,880		'
Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Cash and Cash Equivalents [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	7		17		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	17		'		'
Fair Value of Plan Assets, End of Period	'	7		17		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	7		17		'
Percent of Total	'	0.00%		0.00%		'
Target Allocation Minimum, Percentage	'	0.00%		0.00%		'
Target Allocation Maximum, Percentage	'	15.00%		15.00%		'
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	7		17		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	7		17		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	7		17		'
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Money Market Funds [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	3,941		5,236		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	5,236		'		'
Fair Value of Plan Assets, End of Period	'	3,941		5,236		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	3,941		5,236		'
Percent of Total	'	8.80%		13.10%		'
Target Allocation Minimum, Percentage	'	0.00%		0.00%		'
Target Allocation Maximum, Percentage	'	15.00%		15.00%		'
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	3,941		5,236		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	3,941		5,236		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	3,941		5,236		'
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Arrow Common Stock [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,291		4,197		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	4,197		'		'
Fair Value of Plan Assets, End of Period	'	4,291		4,197		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,291		4,197		'
Percent of Total	'	9.60%		10.50%	[1]	'
Target Allocation Minimum, Percentage	'	0.00%		0.00%		'
Target Allocation Maximum, Percentage	'	10.00%		10.00%		'
Arrow Common Stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,291		4,197		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	4,291		4,197		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,291		4,197		'
Arrow Common Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Arrow Common Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Equity Funds [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	31,757		24,203		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	24,203		'		'
Fair Value of Plan Assets, End of Period	'	31,757		24,203		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	31,757		24,203		'
Percent of Total	'	71.20%		60.80%		'
Target Allocation Minimum, Percentage	'	55.00%		55.00%		'
Target Allocation Maximum, Percentage	'	85.00%		85.00%		'
Equity Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	31,757		24,203		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	31,757		24,203		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	31,757		24,203		'
Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Equity Funds [Member] | North Country Funds - Equity [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	17,419	[2]	13,043	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	13,043	[2]	'		'
Fair Value of Plan Assets, End of Period	'	17,419	[2]	13,043	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	17,419	[2]	13,043	[2]	'
Percent of Total	'	39.10%	[2]	32.80%	[2]	'
Target Allocation Minimum, Percentage	'	'		'		'
Target Allocation Maximum, Percentage	'	'		'		'
Equity Funds [Member] | North Country Funds - Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	17,419	[2]	13,043	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	17,419	[2]	13,043	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	17,419	[2]	13,043	[2]	'
Equity Funds [Member] | North Country Funds - Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0	[2]	0	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Equity Funds [Member] | North Country Funds - Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0	[2]	0	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Equity Funds [Member] | Other Mutual Funds - Equity [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	14,338		11,160		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	11,160		'		'
Fair Value of Plan Assets, End of Period	'	14,338		11,160		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	14,338		11,160		'
Percent of Total	'	32.10%		28.00%		'
Target Allocation Minimum, Percentage	'	'		'		'
Target Allocation Maximum, Percentage	'	'		'		'
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	14,338		11,160		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	14,338		11,160		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	14,338		11,160		'
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Fixed Income Funds [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,657		6,227		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	6,227		'		'
Fair Value of Plan Assets, End of Period	'	4,657		6,227		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,657		6,227		'
Percent of Total	'	10.40%		15.60%		'
Target Allocation Minimum, Percentage	'	10.00%		10.00%		'
Target Allocation Maximum, Percentage	'	30.00%		30.00%		'
Fixed Income Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,657		6,227		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	4,657		6,227		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,657		6,227		'
Fixed Income Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,309	[2]	4,236	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	4,236	[2]	'		'
Fair Value of Plan Assets, End of Period	'	4,309	[2]	4,236	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,309	[2]	4,236	[2]	'
Percent of Total	'	9.60%	[2]	10.60%	[2]	'
Target Allocation Minimum, Percentage	'	'		'		'
Target Allocation Maximum, Percentage	'	'		'		'
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,309	[2]	4,236	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	4,309	[2]	4,236	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	4,309	[2]	4,236	[2]	'
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0	[2]	0	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0	[2]	0	[2]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0	[2]	0	[2]	'
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	348		1,991		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	'	1,991		'		'
Fair Value of Plan Assets, End of Period	'	348		1,991		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	348		1,991		'
Percent of Total	'	0.80%		5.00%		'
Target Allocation Minimum, Percentage	'	'		'		'
Target Allocation Maximum, Percentage	'	'		'		'
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	348		1,991		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	348		1,991		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	348		1,991		'
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, End of Period	'	0		0		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		'
Employees' Pension Plan [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	44,653		39,880		39,206
Benefit Obligation	'	33,259		37,046		35,047
Funded Status of Plan	'	11,394		2,834		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'		'		'
Benefit Obligation, Beginning of Period	33,259	37,046		35,047		'
Service Cost	'	1,506		1,467		1,353
Interest Cost	'	1,261		1,436		1,598
Plan Participants' Contributions	'	0		0		'
Amendments	'	0		0		'
Actuarial Loss	'	-3,820		2,857		'
Benefits Paid	'	-2,734		-3,761		'
Benefit Obligation, End of Period	'	33,259		37,046		35,047
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	44,653	39,880		39,206		'
Actual Return on Plan Assets	'	7,507		4,435		'
Contributions to Pension Plans	'	0		0		'
Plan Participants' Contributions	'	0		0		'
Benefits Paid	'	-2,734		-3,761		'
Fair Value of Plan Assets, End of Period	'	44,653		39,880		39,206
Accumulated Benefit Obligation at Period End	'	32,886		'		'
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]	'	'		'		'
Prepaid Pension Asset	'	11,394		2,834		'
Accrued Benefit Liability	'	0		0		'
Net Benefit Recognized	'	11,394		2,834		'
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]	'	'		'		'
Net Retirement Plan Loss, Before-Tax Amount	'	-8,438		1,286		5,474
Net Prior Service Cost Arising During the Period	'	0		0		191
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	'	-1,231		-1,387		-778
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit	'	-37		-41		-38
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans	'	-9,706		-142		4,849
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]	'	'		'		'
Net Actuarial Loss	'	8,357		18,026		'
Prior Service (Credit) Cost	'	-255		-218		'
Total Accumulated Other Comprehensive Income, Before Tax	'	8,102		17,808		'
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]	'	'		'		'
Net Actuarial Loss	345	'		'		'
Prior Service (Credit) Cost	-45	'		'		'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'		'		'
Service Cost	'	1,506		1,467		1,353
Interest Cost	'	1,261		1,436		1,598
Expected Return on Plan Assets	'	-2,889		-2,865		-2,793
Amortization of Prior Service (Credit) Cost	'	37		41		38
Amortization of Net Loss	'	1,232		1,387		778
Net Periodic Benefit Cost	'	1,147		1,466		974
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]	'	'		'		'
Discount Rate	'	5.10%		3.55%		'
Rate of Compensation Increase	'	3.50%		3.50%		'
Interest Rate Credit for Determining Projected Cash Balance Account	'	4.00%		3.00%		'
Interest Rate to Annuitize Cash Balance Account	'	5.25%		4.50%		'
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account	'	5.25%		4.50%		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Discount Rate	'	3.55%		4.05%		5.15%
Expected Long-Term Return on Assets	'	7.50%		7.50%		7.50%
Rate of Compensation Increase	'	3.50%		3.50%		3.50%
Interest Rate Credit for Determining Projected Cash Balance Account	'	3.00%		3.25%		4.25%
Interest Rate to Annuitize Cash Balance Account	'	4.50%		5.00%		5.50%
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts	'	4.50%		5.00%		5.50%
Fair Value of Plan Assets	'	44,653		39,880		39,206
Expected Future Benefit Payments [Abstract]	'	'		'		'
2014	'	3,068		'		'
2015	'	2,047		'		'
2016	'	2,344		'		'
2017	'	2,252		'		'
2018	'	2,165		'		'
2019 - 2023	'	12,516		'		'
Estimated Contributions During 2014	0	'		'		'
Select Executive Retirement Plan [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		0
Benefit Obligation	'	4,459		5,324		4,529
Funded Status of Plan	'	-4,459		-5,324		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'		'		'
Benefit Obligation, Beginning of Period	4,459	5,324		4,529		'
Service Cost	'	0		87		81
Interest Cost	'	163		190		222
Plan Participants' Contributions	'	0		0		'
Amendments	'	0		405		'
Actuarial Loss	'	-555		441		'
Benefits Paid	'	-473		-328		'
Benefit Obligation, End of Period	'	4,459		5,324		4,529
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	0	0		0		'
Actual Return on Plan Assets	'	0		0		'
Contributions to Pension Plans	'	473		328		'
Plan Participants' Contributions	'	0		0		'
Benefits Paid	'	-473		-328		'
Fair Value of Plan Assets, End of Period	'	0		0		0
Accumulated Benefit Obligation at Period End	'	4,459		'		'
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]	'	'		'		'
Prepaid Pension Asset	'	0		0		'
Accrued Benefit Liability	'	-4,459		-5,324		'
Net Benefit Recognized	'	-4,459		-5,324		'
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]	'	'		'		'
Net Retirement Plan Loss, Before-Tax Amount	'	-554		441		151
Net Prior Service Cost Arising During the Period	'	0		405		75
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	'	-140		-156		-147
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit	'	-79		-53		32
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans	'	-773		637		111
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]	'	'		'		'
Net Actuarial Loss	'	1,674		2,368		'
Prior Service (Credit) Cost	'	642		721		'
Total Accumulated Other Comprehensive Income, Before Tax	'	2,316		3,089		'
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]	'	'		'		'
Net Actuarial Loss	90	'		'		'
Prior Service (Credit) Cost	72	'		'		'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'		'		'
Service Cost	'	0		87		81
Interest Cost	'	163		190		222
Expected Return on Plan Assets	'	0		0		0
Amortization of Prior Service (Credit) Cost	'	79		53		-32
Amortization of Net Loss	'	139		156		147
Net Periodic Benefit Cost	'	381		486		418
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]	'	'		'		'
Discount Rate	'	4.85%		3.15%		'
Rate of Compensation Increase	'	3.50%		3.50%		'
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account	'	5.25%		4.50%		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Discount Rate	'	3.15%		4.05%		5.15%
Rate of Compensation Increase	'	3.50%		3.50%		3.50%
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts	'	4.50%		5.00%		5.50%
Fair Value of Plan Assets	'	0		0		0
Expected Future Benefit Payments [Abstract]	'	'		'		'
2014	'	452		'		'
2015	'	440		'		'
2016	'	416		'		'
2017	'	402		'		'
2018	'	388		'		'
2019 - 2023	'	1,699		'		'
Estimated Contributions During 2014	452	'		'		'
Postretirement Benefit Plans [Member]	'	'		'		'
Defined Benefit Plan, Funded Status of Plan [Abstract]	'	'		'		'
Fair Value of Plan Assets	'	0		0		0
Benefit Obligation	'	7,619		9,213		8,556
Funded Status of Plan	'	-7,619		-9,213		'
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'		'		'
Benefit Obligation, Beginning of Period	7,619	9,213		8,556		'
Service Cost	'	211		202		173
Interest Cost	'	308		338		372
Plan Participants' Contributions	'	368		348		'
Amendments	'	0		0		'
Actuarial Loss	'	-1,648		491		'
Benefits Paid	'	-833		-722		'
Benefit Obligation, End of Period	'	7,619		9,213		8,556
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'		'		'
Fair Value of Plan Assets, Beginning of Period	0	0		0		'
Actual Return on Plan Assets	'	0		0		'
Contributions to Pension Plans	'	465		374		'
Plan Participants' Contributions	'	368		348		'
Benefits Paid	'	-833		-722		'
Fair Value of Plan Assets, End of Period	'	0		0		0
Accumulated Benefit Obligation at Period End	'	7,619		'		'
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]	'	'		'		'
Prepaid Pension Asset	'	0		0		'
Accrued Benefit Liability	'	-7,619		-9,213		'
Net Benefit Recognized	'	-7,619		-9,213		'
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]	'	'		'		'
Net Retirement Plan Loss, Before-Tax Amount	'	-1,648		491		504
Net Prior Service Cost Arising During the Period	'	0		0		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	'	-142		-134		-71
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit	'	114		114		114
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans	'	-1,676		471		547
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]	'	'		'		'
Net Actuarial Loss	'	1,060		2,850		'
Prior Service (Credit) Cost	'	-305		-419		'
Total Accumulated Other Comprehensive Income, Before Tax	'	755		2,431		'
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]	'	'		'		'
Net Actuarial Loss	26	'		'		'
Prior Service (Credit) Cost	-114	'		'		'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'		'		'
Service Cost	'	211		202		173
Interest Cost	'	308		338		372
Expected Return on Plan Assets	'	0		0		0
Amortization of Prior Service (Credit) Cost	'	-114		-114		-114
Amortization of Net Loss	'	142		134		71
Net Periodic Benefit Cost	'	547		560		502
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]	'	'		'		'
Discount Rate	'	5.10%		3.55%		'
Rate of Compensation Increase	'	3.50%		3.50%		'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'	'		'		'
Discount Rate	'	3.55%		4.05%		5.15%
Rate of Compensation Increase	'	3.50%		3.50%		3.50%
Fair Value of Plan Assets	'	0		0		0
Expected Future Benefit Payments [Abstract]	'	'		'		'
2014	'	510		'		'
2015	'	531		'		'
2016	'	539		'		'
2017	'	549		'		'
2018	'	562		'		'
2019 - 2023	'	3,026		'		'
Estimated Contributions During 2014	$510	'		'		'
[1]	Acquisition of Arrow Financial Corporation common stock was under 10% of the total fair value of the employee's pension plan assets at the time of acquisition.
[2]	The North Country Funds - Equity and the North Country Funds - Fixed Income are publicly traded mutual funds advised by Arrow's subsidiary, North Country Investment Advisers, Inc.

Other_Expenses_Details

Other Expenses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expenses [Abstract]	'	'	'
Computer Services	$3,261	$2,263	$1,654
Legal and Other Professional Fees	1,823	1,962	1,972
Postage and Courier	1,046	1,040	1,088
Stationery and Printing	905	975	891
Advertising and Promotion	879	831	853
Telephone and Communications	804	808	981
Intangible Asset Amortization	452	518	510
All Other	3,486	3,243	3,095
Total Other Operating Expense	$12,656	$11,640	$11,044

Income_Taxes_Current_Income_Ta

Income Taxes Current Income Tax Expense (Benefit), Continuing Operations(Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]	'	'	'
Current Tax Expense: Federal	$7,933	$8,763	$6,726
Current Tax Expense: State	852	1,251	816
Total Current Tax Expense	8,785	10,014	7,542
Deferred Tax Expense: Federal	172	-290	1,775
Deferred Tax Expense: State	122	-63	397
Deferred Income Tax Expense Expense (Benefit)	294	-353	2,172
Income Tax Expense (Benefit), Continuing Operations	$9,079	$9,661	$9,714

Income_Taxes_Effective_Income_

Income Taxes Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate Reconciliation, Percent [Abstract]	'	'	'
Computed Tax Expense at Statutory Rate	$10,806	$11,144	$11,076
Tax-Exempt Income	-2,238	-2,132	-2,199
Nondeductible Interest Expense	80	95	152
State Taxes, Net of Federal Income Tax Benefit	633	814	788
Other Items, Net	-202	-260	-103
Income Tax Expense (Benefit), Continuing Operations	$9,079	$9,661	$9,714

Income_Taxes_Components_of_Def

Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Tax Assets, Gross [Abstract]	'	'
Allowance for Loan Losses	$5,794	$6,105
Pension and Deferred Compensation Plans	3,999	4,140
Pension Liability Included in Accumulated Other Comprehensive Income	4,426	9,241
Other	566	608
Total Gross Deferred Tax Assets	14,785	20,094
Valuation Allowance for Deferred Tax Assets	0	0
Total Gross Deferred Tax Assets, Net of Valuation Allowance	14,785	20,094
Deferred Tax Liabilities, Gross [Abstract]	'	'
Deferred Tax Liabilities, Prepaid Expenses	7,724	8,178
Depreciation	1,561	1,475
Deferred Income	3,526	3,189
Net Unrealized Gains on Securities Available-for-Sale Included in Accumulated Other Comprehensive Income	1,557	3,690
Goodwill	5,230	5,225
Total Gross Deferred Tax Liabilites	$19,598	$21,757

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Earnings Per Share [Abstract]	'		'		'
Net Income	$21,795		$22,179		$21,933
Basic Shares, in Shares	12,296	[1]	12,247	[1]	12,209	[1]
Basic Earnings, in Earnings Per Share	$1.77	[1]	$1.81	[1]	$1.80	[1]
Dilutive Average Shares Attributable to Stock Options, in Shares	31		10		12
Weighted Average Shares - Diluted, in Shares	12,327	[1]	12,257	[1]	12,221	[1]
Diluted Earnings, In Earnings Per Share	$1.77	[1]	$1.81	[1]	$1.79	[1]
Antidilutive Shares Excluded from the Calculation of Earnings Per Share, in Shares	47		203		136
[1]	Share and Per Share Amounts have been restated for the September 2013 2% stock dividend.

Fair_Values_Fair_Value_Recurri

Fair Values Fair Value - Recurring and Nonrecurring (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	$457,606	$478,698
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	457,606	478,698
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	457,606	478,698
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Collateral Dependent Impaired Loans	'	1,020
Other Real Estate and Repossessed Assets, Net	144	1,034
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Collateral Dependent Impaired Loans	'	0
Other Real Estate and Repossessed Assets, Net	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Collateral Dependent Impaired Loans	'	0
Other Real Estate and Repossessed Assets, Net	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Collateral Dependent Impaired Loans	'	1,020
Other Real Estate and Repossessed Assets, Net	144	1,034
Fair Value, Measurements, Nonrecurring [Member] | Total Gains (Losses) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Collateral Dependent Impaired Loans	'	-1,021
Other Real Estate and Repossessed Assets, Net	-79	-19
U.S. Agency Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	136,475	122,457
U.S. Agency Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
U.S. Agency Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	136,475	122,457
U.S. Agency Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
State and Municipal Obligations [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	127,389	84,838
State and Municipal Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	127,389	84,838
State and Municipal Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
State and Municipal Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	127,389	84,838
State and Municipal Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Mortgage-Backed Securities - Residential [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	175,778	261,804
Mortgage-Backed Securities - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	175,778	261,804
Mortgage-Backed Securities - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Mortgage-Backed Securities - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	175,778	261,804
Mortgage-Backed Securities - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Corporate and Other Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	16,798	8,451
Corporate and Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	16,798	8,451
Corporate and Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Corporate and Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	16,798	8,451
Corporate and Other Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Mututal Funds and Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	1,166	1,148
Mututal Funds and Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	1,166	1,148
Mututal Funds and Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	0	0
Mututal Funds and Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	1,166	1,148
Mututal Funds and Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Available-for-sale Securities	$0	$0

Fair_Values_Fair_Value_By_Bala

Fair Values Fair Value By Balance Sheet Grouping (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents	$49,980	$48,832	$43,736	$31,079
Available-for-sale Securities	457,606	478,698	'	'
Held-to-Maturity Securities	299,261	239,803	'	'
Held-to-maturity Securities, at Fair Value	302,305	248,252	'	'
Federal Home Loan Bank and Federal Reserve Bank Stock	6,281	5,792	'	'
Net Loans	1,252,038	1,157,043	'	'
Deposits	1,842,330	1,731,155	'	'
Federal Home Loan Bank Term Advances	20,000	30,000	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	'	'
Carrying Amount [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents	49,980	48,832	'	'
Available-for-sale Securities	457,606	478,698	'	'
Held-to-Maturity Securities	299,261	239,803	'	'
Federal Home Loan Bank and Federal Reserve Bank Stock	6,281	5,792	'	'
Net Loans	1,252,038	1,157,043	'	'
Accrued Interest Receivable	5,745	5,486	'	'
Deposits	1,842,330	1,731,155	'	'
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	11,777	12,678	'	'
Federal Home Loan Bank Term Advances	73,000	59,000	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	'	'
Accrued Interest Payable	439	584	'	'
Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	49,980	48,832	'	'
Available-for-sale Securities	457,606	478,698	'	'
Held-to-maturity Securities, at Fair Value	302,305	248,252	'	'
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	6,281	5,792	'	'
Net Loans, Fair Value Disclosure	1,266,020	1,192,628	'	'
Accrued Interest Receivable, Fair Value Disclosure	5,745	5,486	'	'
Deposits, Fair Value Disclosure	1,839,613	1,732,894	'	'
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	11,777	12,678	'	'
Federal Home Loan Bank Term Advances, Fair Value Disclosure	74,629	60,312	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	'	'
Accrued Interest Payable, Fair Value Disclosure	439	584	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	49,980	48,832	'	'
Available-for-sale Securities	0	0	'	'
Held-to-maturity Securities, at Fair Value	0	0	'	'
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	6,281	5,792	'	'
Net Loans, Fair Value Disclosure	0	0	'	'
Accrued Interest Receivable, Fair Value Disclosure	5,745	5,486	'	'
Deposits, Fair Value Disclosure	1,595,103	1,447,882	'	'
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	11,777	12,678	'	'
Federal Home Loan Bank Term Advances, Fair Value Disclosure	53,000	29,000	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	'	'
Accrued Interest Payable, Fair Value Disclosure	439	584	'	'
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	0	0	'	'
Available-for-sale Securities	457,606	478,698	'	'
Held-to-maturity Securities, at Fair Value	302,305	248,252	'	'
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	0	0	'	'
Net Loans, Fair Value Disclosure	0	0	'	'
Accrued Interest Receivable, Fair Value Disclosure	0	0	'	'
Deposits, Fair Value Disclosure	244,510	285,012	'	'
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	0	0	'	'
Federal Home Loan Bank Term Advances, Fair Value Disclosure	21,629	31,312	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	20,000	20,000	'	'
Accrued Interest Payable, Fair Value Disclosure	0	0	'	'
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and Cash Equivalents, Fair Value Disclosure	0	0	'	'
Available-for-sale Securities	0	0	'	'
Held-to-maturity Securities, at Fair Value	0	0	'	'
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Fair Value Disclosure	0	0	'	'
Net Loans, Fair Value Disclosure	1,266,020	1,192,628	'	'
Accrued Interest Receivable, Fair Value Disclosure	0	0	'	'
Deposits, Fair Value Disclosure	0	0	'	'
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase, Fair Value Disclosure	0	0	'	'
Federal Home Loan Bank Term Advances, Fair Value Disclosure	0	0	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts, Fair Value Disclosure	0	0	'	'
Accrued Interest Payable, Fair Value Disclosure	$0	$0	'	'

Leases_Rent_Expense_Details

Leases Rent Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]	'	'	'
Rent Expense	$671	$597	$570

Leases_Details

Leases (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'
2014	$638
2015	583
2016	440
2017	347
2018	277
Later Years	448
Total Minimum Lease Payments	$2,733

Regulatory_Matters_Other_Regul

Regulatory Matters Other Regulation Disclosures (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]	'
Maximum Subsidiary Dividend	$26,668

Regulatory_Matters_Details

Regulatory Matters (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Arrow Financial Corporation [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital (to Risk Weighted Assets) - Actual Amount	$212,360	$200,480
Total Capital (to Risk Weighted Assets) - Actual Ratio	15.80%	16.30%
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	107,524	98,395
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Amount	134,405	122,994
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) - Actual Amount	197,906	185,170
Tier I Capital (to Risk Weighted Assets) - Actual Ratio	14.70%	15.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Acounts For Capital Adequacy Purposes Amount	53,852	49,379
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	80,778	74,068
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	6.00%	6.00%
Tier I Capital (to Average Assets) - Actual Amount	197,906	185,170
Tier I Capital (to Average Assets) - Actual Ratio	9.20%	9.10%
Tier I Capital (to Average Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	86,046	81,393
Tier I Capital (to Average Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital (to Average Assets) - Minimum Amounts To Be Well-Capitalized Amount	86,046	81,393
Tier I Capital (to Average Assets) - Minimum Amounts To Be Well-Capitalized Ratio	4.00%	4.00%
Glens Falls National [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital (to Risk Weighted Assets) - Actual Amount	172,720	164,889
Total Capital (to Risk Weighted Assets) - Actual Ratio	15.40%	16.20%
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	89,725	81,427
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Amount	112,156	101,783
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) - Actual Amount	160,849	152,205
Tier I Capital (to Risk Weighted Assets) - Actual Ratio	14.40%	14.90%
Tier I Capital (to Risk Weighted Assets) - Minimum Acounts For Capital Adequacy Purposes Amount	44,680	40,860
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	67,020	61,291
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	6.00%	6.00%
Tier I Capital (to Average Assets) - Actual Amount	160,849	152,205
Tier I Capital (to Average Assets) - Actual Ratio	8.80%	8.80%
Tier I Capital (to Average Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	73,113	69,184
Tier I Capital (to Average Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital (to Average Assets) - Minimum Amounts To Be Well-Capitalized Amount	91,391	86,480
Tier I Capital (to Average Assets) - Minimum Amounts To Be Well-Capitalized Ratio	5.00%	5.00%
Saratoga National [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital (to Risk Weighted Assets) - Actual Amount	33,396	31,911
Total Capital (to Risk Weighted Assets) - Actual Ratio	14.80%	15.10%
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	18,052	16,906
Total Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Amount	22,565	21,133
Total Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets) - Actual Amount	30,833	29,297
Tier I Capital (to Risk Weighted Assets) - Actual Ratio	13.70%	13.80%
Tier I Capital (to Risk Weighted Assets) - Minimum Acounts For Capital Adequacy Purposes Amount	9,002	8,492
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	13,504	12,738
Tier I Capital (to Risk Weighted Assets) - Minimum Amounts To Be Well-Capitalized Ratio	6.00%	6.00%
Tier I Capital (to Average Assets) - Actual Amount	30,833	29,297
Tier I Capital (to Average Assets) - Actual Ratio	9.70%	9.40%
Tier I Capital (to Average Assets) - Minimum Amounts For Capital Adequacy Purposes Amount	12,715	12,467
Tier I Capital (to Average Assets) - Minimum Amounts For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital (to Average Assets) - Minimum Amounts To Be Well-Capitalized Amount	$15,893	$15,584
Tier I Capital (to Average Assets) - Minimum Amounts To Be Well-Capitalized Ratio	5.00%	5.00%

Parent_Only_Financial_Informat2

Parent Only Financial Information Parent Only Balance Sheet (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
ASSETS	'	'	'	'
Interest-Bearing Deposits at Banks	$12,705	$11,756	'	'
Available-for-sale Securities	457,606	478,698	'	'
Held-to-Maturity Securities	299,261	239,803	'	'
Other Assets	43,235	37,236	'	'
Total Assets	2,163,698	2,022,796	'	'
LIABILITIES	'	'	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	'	'
Other Liabilities	24,437	24,138	'	'
Total Liabilities	1,971,544	1,846,971	'	'
STOCKHOLDERS' EQUITY	'	'	'	'
Total Stockholders' Equity	192,154	175,825	166,385	152,259
Total Liabilities and Stockholders' Equity	2,163,698	2,022,796	'	'
Arrow Financial Corporation [Member]	'	'	'	'
ASSETS	'	'	'	'
Interest-Bearing Deposits at Banks	3,349	1,913	'	'
Available-for-sale Securities	1,166	1,148	'	'
Held-to-Maturity Securities	1,000	1,000	'	'
Investment in Subsidiaries at Equity	206,680	192,985	'	'
Other Assets	5,807	5,339	'	'
Total Assets	218,002	202,385	'	'
LIABILITIES	'	'	'	'
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000	'	'
Other Liabilities	5,848	6,560	'	'
Total Liabilities	25,848	26,560	'	'
STOCKHOLDERS' EQUITY	'	'	'	'
Total Stockholders' Equity	192,154	175,825	'	'
Total Liabilities and Stockholders' Equity	$218,002	$202,385	'	'

Parent_Only_Financial_Informat3

Parent Only Financial Information Parent Only Income Statement (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'
Interest and Dividends on Investments	$64,138	$69,379	$76,791
Other Operating Income	1,024	1,170	746
Net Gains on Securities Transactions	540	865	2,795
Interest Expense	7,922	11,957	18,679
Salaries and Employee Benefits	31,182	31,703	30,205
Other Operating Expense	12,656	11,640	11,044
Income Tax Expense (Benefit)	-9,079	-9,661	-9,714
Net Income	21,795	22,179	21,933
Arrow Financial Corporation [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Dividends from Bank Subsidiaries	12,900	12,700	14,450
Interest and Dividends on Investments	116	123	127
Other Operating Income	549	776	596
Net Gains on Securities Transactions	0	63	17
Total Income	13,565	13,662	15,190
Interest Expense	640	692	669
Salaries and Employee Benefits	59	75	92
Other Operating Expense	860	957	820
Total Expense	1,559	1,724	1,581
Income Before Income Tax Benefit and Equity in Undistributed Net Income of Subsidiaries	12,006	11,938	13,609
Income Tax Expense (Benefit)	634	575	477
Equity in Undistributed Net Income of Subsidiaries	9,155	9,666	7,847
Net Income	$21,795	$22,179	$21,933

Parent_Only_Financial_Informat4

Parent Only Financial Information Parent Only Statement of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash Flows from Operating Activities:	'		'		'
Net Income	$21,795		$22,179		$21,933
Net Gains on the Sale of Securities Available-for-Sale	527		949		2,795
Shares Issued Under the Directors' Stock Plan	-198		-175		-175
Stock-Based Compensation Expense	372		424		354
Net Cash Provided By Operating Activities	36,673		32,460		36,085
Cash Flows from Investing Activities:	'		'		'
Proceeds from the Sale of Securities Available-for-Sale	16,295		58,718		39,009
Purchases of Securities Available-for-Sale	-136,416		-197,029		-354,310
Net Cash Provided by (Used In) Investing Activities	-149,015		-65,645		-44,796
Cash Flows from Financing Activities:	'		'		'
Shares Issued for Stock Options Exercised, net	1,254		2,105		1,413
Shares Issued Under the Employee Stock Purchase Plan	477		484		474
Shares Issued for Dividend Reinvestment Plans	1,280		1,822		1,796
Tax Benefit for Exercises of Stock Options	23		68		51
Purchases of Treasury Stock	-1,709		-4,877		-6,039
Cash Dividends Paid	-12,109	[1]	-11,815	[1]	-11,448	[1]
Net Cash Provided By Financing Activities	113,490		38,281		21,368
Net Increase in Cash and Cash Equivalents	1,148		5,096		12,657
Cash and Cash Equivalents at Beginning of Year	48,832		43,736		31,079
Cash and Cash Equivalents at End of Year	49,980		48,832		43,736
Interest on Deposits and Borrowings	8,067		12,520		19,490
Shares Issued for Acquisition of Subsidiary	233		233		5,261
Arrow Financial Corporation [Member]	'		'		'
Cash Flows from Operating Activities:	'		'		'
Net Income	21,795		22,179		21,933
Undistributed Net Income of Subsidiaries	-9,155		-9,666		-7,847
Net Gains on the Sale of Securities Available-for-Sale	0		-63		-17
Shares Issued Under the Directors' Stock Plan	198		175		175
Stock-Based Compensation Expense	372		424		354
Changes in Other Assets and Other Liabilities	-990		-1,640		-165
Net Cash Provided By Operating Activities	12,220		11,409		14,433
Cash Flows from Investing Activities:	'		'		'
Proceeds from the Sale of Securities Available-for-Sale	45		681		410
Purchases of Securities Available-for-Sale	-45		-359		-253
Net Cash Provided by (Used In) Investing Activities	0		322		157
Cash Flows from Financing Activities:	'		'		'
Shares Issued for Stock Options Exercised, net	1,254		2,105		1,413
Shares Issued Under the Employee Stock Purchase Plan	477		484		474
Shares Issued for Dividend Reinvestment Plans	1,280		1,822		1,796
Tax Benefit for Exercises of Stock Options	23		68		51
Purchases of Treasury Stock	-1,709		-4,877		-6,039
Cash Dividends Paid	-12,109		-11,815		-11,448
Net Cash Provided By Financing Activities	-10,784		-12,213		-13,753
Net Increase in Cash and Cash Equivalents	1,436		-482		837
Cash and Cash Equivalents at Beginning of Year	1,913		2,395		1,558
Cash and Cash Equivalents at End of Year	3,349		1,913		2,395
Interest on Deposits and Borrowings	640		692		669
Shares Issued for Acquisition of Subsidiary	$233		$233		$5,261
[1]	Cash dividends paid per share have been adjusted for the September 2013 2% stock dividend.