Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 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		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Fair Value of Assets and Liabilities Measured on a Recurring Basis:
September 30, 2013
Securities Available-for Sale:
U.S. Agency Obligations	$	149,774	$	—	$	149,774	$	—
State and Municipal Obligations	133,919		—		133,919		—
Mortgage-Backed Securities - Residential	185,215		—		185,215		—
Corporate and Other Debt Securities	16,798		—		16,798		—
Mutual Funds and Equity Securities	1,182		—		1,182		—
Total Securities Available-for-Sale	$	486,888	$	—	$	486,888	$	—
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	$	—
September 30, 2012
Securities Available-for Sale:
U.S. Agency Obligations	$	56,391	$	—	$	56,391	$	—
State and Municipal Obligations	62,965		—		62,965		—
Mortgage-Backed Securities - Residential	304,085		—		304,085		—
Corporate and Other Debt Securities	800		—		800		—
Mutual Funds and Equity Securities	1,175		—		1,175		—
Total Securities Available-for Sale	$	425,416	$	—	$	425,416	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
September 30, 2013
Collateral Dependent Impaired Loans	$	—	$	—	$	—	$	—
Other Real Estate Owned and Repossessed Assets, Net	$	499	$	—	$	—	$	499
December 31, 2012
Collateral Dependent Impaired Loans	$	1,020	$	—	$	—	$	1,020
Other Real Estate Owned and Repossessed Assets, Net	$	1,034	$	—	$	—	$	1,034
September 30, 2012
Collateral Dependent Impaired Loans	$	486	$	—	$	—	$	486
Other Real Estate Owned and Repossessed Assets, Net	$	834	$	—	$	—	$	834

Fair Value, by Balance Sheet Grouping [Table Text Block]

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 Amount		Fair Value		Level 1		Level 2		Level 3
September 30, 2013
Cash and Cash Equivalents	$	72,052	$	72,052	$	72,052	$	—	$	—
Securities Available-for-Sale	486,888		486,888		—		486,888		—
Securities Held-to-Maturity	273,626		278,390		—		278,390		—
Federal Home Loan Bank and Federal Reserve Bank Stock	3,896		3,896		3,896		—		—
Net Loans	1,228,786		1,246,005		—		—		1,246,005
Accrued Interest Receivable	6,614		6,614		6,614		—		—
Deposits	1,895,375		1,891,086		1,635,549		255,537		—
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	15,977		15,977		15,977		—		—
Federal Home Loan Bank Term Advances	20,000		20,823		—		20,823		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	472		472		472		—		—
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   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	584		584		584		—		—
September 30, 2012
Cash and Cash Equivalents	$	136,418	$	136,418	$	136,418	$	—	$	—
Securities Available-for-Sale	425,416		425,416		—		425,416		—
Securities Held-to-Maturity	244,949		254,936		—		254,936		—
Federal Home Loan Bank and Federal Reserve Bank Stock	4,487		4,487		4,487		—		—
Net Loans	1,137,704		1,164,743		—		—		1,164,743
Accrued Interest Receivable	6,510		6,510		6,510		—		—
Deposits	1,771,461		1,774,549		1,472,103		302,446		—
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	18,042		18,042		18,042		—		—
Federal Home Loan Bank Term Advances	30,000		31,513		—		31,513		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	676		676		676		—		—