Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

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, 2015
Securities Available-for Sale:
U.S. Agency Obligations	$	151,527	$	—	$	151,527	$	—
State and Municipal Obligations	74,095		—		74,095		—
Mortgage-Backed Securities - Residential	149,510		—		149,510		—
Corporate and Other Debt Securities	16,756		—		16,756		—
Mutual Funds and Equity Securities	1,245		—		1,245		—
Total Securities Available-for-Sale	$	393,133	$	—	$	393,133	$	—
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	$	—
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	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
March 31, 2015
Other Real Estate Owned and Repossessed Assets, Net	$	529	$	—	$	—	$	529	$	(15	)
Collateral Dependent Impaired Loans	600		—		—		$	600	(149		)
December 31, 2014
Other Real Estate Owned and Repossessed Assets, Net	$	393	$	—	$	—	$	393	$	(15	)
Collateral Dependent Impaired Loans	574		—		—		$	574	(109		)
March 31, 2014
Other Real Estate Owned and Repossessed Assets, Net	$	198	$	—	$	—	$	198	$	(52	)

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, 2015
Cash and Cash Equivalents	$	111,595	$	111,595	$	111,595	$	—	$	—
Securities Available-for-Sale	393,133		393,133		—		393,133		—
Securities Held-to-Maturity	305,175		312,500		—		312,500		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	4,806		4,806		4,806		—		—
Net Loans	1,419,169		1,429,553		—		—		1,429,553
Accrued Interest Receivable	6,698		6,698		6,698		—		—
Deposits	2,018,704		2,016,098		1,820,165		195,933		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	15,895		15,895		15,895		—		—
Federal Home Loan Bank Term Advances	50,000		50,851		—		50,851		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	289		289		289		—		—
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		—		—
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		—		—