Fair Values (Tables)

12 Months Ended

Dec. 31, 2014

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 In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Gains (Losses)
December 31, 2014
Securities Available-for Sale:
U.S. Agency Obligations	$	137,603	$	—	$	137,603	$	—
State and Municipal Obligations	81,730		—		81,730		—
Mortgage-Backed Securities - Residential	128,827		—		128,827		—
Corporate and Other Debt Securities	16,725		—		16,725		—
Mutual Funds and Equity Securities	1,254		—		1,254		—
Total Securities Available-for-Sale	$	366,139	$	—	$	366,139	$	—
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	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
December 31, 2014
Collateral Dependent Impaired Loans	$	574	$	—	$	—	$	574	$	(109	)
Other Real Estate Owned and Repossessed Assets, Net	$	393	$	—	$	—	$	393	$	(15	)
December 31, 2013
Other Real Estate Owned and Repossessed Assets, Net	$	144	$	—	$	—	$	144	$	(79	)

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 Amount		Fair Value		Level 1		Level 2		Level 3
December 31, 2014
Cash and Cash Equivalents	$	46,295	$	46,295	$	46,295	$	—	$	—
Securities Available-for-Sale	366,139		366,139		—		366,139		—
Securities Held-to-Maturity	302,024		308,566		—		308,566		—
Federal Home Loan Bank and Federal Reserve Bank Stock	4,851		4,851		4,851		—		—
Net Loans	1,397,698		1,405,454		—		—		1,405,454
Accrued Interest Receivable	5,834		5,834		5,834		—		—
Deposits	1,902,948		1,899,682		1,697,105		202,577		—
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	19,421		19,421		19,421		—		—
Federal Home Loan Bank Term Advances	51,000		51,258		41,000		10,258		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	274		274		274		—		—
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   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	439		439		439		—		—