Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 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:
June 30, 2013
Securities Available-for Sale:
U.S. Agency Obligations	$	150,046	$	—	$	150,046	$	—
State and Municipal Obligations	130,444		—		130,444		—
Mortgage-Backed Securities - Residential	203,230		—		203,230		—
Corporate and Other Debt Securities	16,711		—		16,711		—
Mutual Funds and Equity Securities	1,143		—		1,143		—
Total Securities Available-for-Sale	$	501,574	$	—	$	501,574	$	—
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	$	—
June 30, 2012
Securities Available-for Sale:
U.S. Agency Obligations	$	48,655	$	—	$	48,655	$	—
State and Municipal Obligations	55,013		—		55,013		—
Mortgage-Backed Securities - Residential	325,076		—		325,076		—
Corporate and Other Debt Securities	801		—		801		—
Mutual Funds and Equity Securities	1,465		249		1,216		—
Total Securities Available-for Sale	$	431,010	$	249	$	430,761	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
June 30, 2013
Collateral Dependent Impaired Loans	$	—	$	—	$	—	$	—
Other Real Estate Owned and Repossessed Assets, Net	$	1,175	$	—	$	—	$	1,175
December 31, 2012
Collateral Dependent Impaired Loans	$	1,020	$	—	$	—	$	1,020
Other Real Estate Owned and Repossessed Assets, Net	$	1,034	$	—	$	—	$	1,034
June 30, 2012
Collateral Dependent Impaired Loans	$	486	$	—	$	—	$	486
Other Real Estate Owned and Repossessed Assets, Net	$	837	$	—	$	—	$	837

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
June 30, 2013
Cash and Cash Equivalents	$	44,600	$	44,600	$	44,600	$	—	$	—
Securities Available-for-Sale	501,574		501,574		—		501,574		—
Securities Held-to-Maturity	248,914		252,691		—		252,691		—
Federal Home Loan Bank and Federal Reserve Bank Stock	6,136		6,136		6,136		—		—
Net Loans	1,190,056		1,198,430		—		—		1,198,430
Accrued Interest Receivable	5,708		5,708		5,708		—		—
Deposits	1,779,905		1,776,590		1,510,867		265,723		—
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	14,738		14,738		14,738		—		—
Federal Home Loan Bank Term Advances	70,000		70,267		40,000		30,267		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	493		493		493		—		—
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		—		—
June 30, 2012
Cash and Cash Equivalents	$	57,751	$	57,751	$	57,751	$	—	$	—
Securities Available-for-Sale	431,010		431,010		249		430,761		—
Securities Held-to-Maturity	252,902		261,574		—		261,574		—
Federal Home Loan Bank and Federal Reserve Bank Stock	4,479		4,479		4,479		—		—
Net Loans	1,131,430		1,156,811		—		—		1,156,811
Accrued Interest Receivable	5,712		5,712		5,712		—		—
Deposits	1,704,883		1,708,994		1,380,904		328,090		—
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	16,097		16,097		16,097		—		—
Federal Home Loan Bank Term Advances	30,000		31,269		—		31,269		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	898		898		898		—		—