Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 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		Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Gains (Losses)
Fair Value of Assets and Liabilities Measured on a Recurring Basis:
March 31, 2014
Securities Available-for Sale:
U.S. Agency Obligations	$	121,220	$	—	$	121,220	$	—
State and Municipal Obligations	125,410		—		125,410		—
Mortgage-Backed Securities - Residential	164,541		—		164,541		—
Corporate and Other Debt Securities	16,839		—		16,839		—
Mutual Funds and Equity Securities	1,220		—		1,220		—
Total Securities Available-for-Sale	$	429,230	$	—	$	429,230	$	—
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	$	—
March 31, 2013
Securities Available-for Sale:
U.S. Agency Obligations	$	132,153	$	—	$	132,153	$	—
State and Municipal Obligations	104,469		—		104,469		—
Mortgage-Backed Securities - Residential	228,323		—		228,323		—
Corporate and Other Debt Securities	12,691		—		12,691		—
Mutual Funds and Equity Securities	1,139		—		1,139		—
Total Securities Available-for Sale	$	478,775	$	—	$	478,775	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
March 31, 2014
Other Real Estate Owned and Repossessed Assets, Net	$	198	$	—	$	—	$	198	$	(52	)
December 31, 2013
Other Real Estate Owned and Repossessed Assets, Net	$	144	$	—	$	—	$	144	$	(79	)
March 31, 2013
Other Real Estate Owned and Repossessed Assets, Net	$	1,194	$	—	$	—	$	1,194	$	(56	)

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
March 31, 2014
Cash and Cash Equivalents	$	76,050	$	76,050	$	76,050	$	—	$	—
Securities Available-for-Sale	429,230		429,230		—		429,230		—
Securities Held-to-Maturity	317,632		322,335		—		322,335		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	3,896		3,896		3,896		—		—
Net Loans	1,295,787		1,306,043		—		—		1,306,043
Accrued Interest Receivable	6,808		6,808		6,808		—		—
Deposits	1,948,019		1,944,116		1,709,784		234,332		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	13,787		13,787		13,787		—		—
Federal Home Loan Bank Term Advances	20,000		20,519		—		20,519		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	405		405		405		—		—
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		—		—
March 31, 2013
Cash and Cash Equivalents	$	137,174	$	137,174	$	137,174	$	—	$	—
Securities Available-for-Sale	478,775		478,775		—		478,775		—
Securities Held-to-Maturity	251,456		259,562		—		259,562		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	4,493		4,493		4,493		—		—
Net Loans	1,150,156		1,167,063		—		—		1,167,063
Accrued Interest Receivable	6,481		6,481		6,481		—		—
Deposits	1,851,206		1,850,614		1,575,954		274,660		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	12,166		12,166		12,166		—		—
Federal Home Loan Bank Term Advances	30,000		31,263		—		31,263		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	523		523		523		—		—