Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016
Securities Available-for Sale:
U.S. Agency Obligations	$	157,646	$	—	$	157,646	$	—
State and Municipal Obligations	49,543		—		49,543		—
Mortgage-Backed Securities - Residential	168,110		—		168,110		—
Corporate and Other Debt Securities	11,715		—		11,715		—
Mutual Funds and Equity Securities	1,233		—		1,233		—
Total Securities Available-for-Sale	$	388,247	$	—	$	388,247	$	—
December 31, 2015
Securities Available-for Sale:
U.S. Agency Obligations	$	155,782	$	—	$	155,782	$	—
State and Municipal Obligations	52,408		—		52,408		—
Mortgage-Backed Securities - Residential	178,588		—		178,588		—
Corporate and Other Debt Securities	14,299		—		14,299		—
Mutual Funds and Equity Securities	1,232		—		1,232		—
Total Securities Available-for Sale	$	402,309	$	—	$	402,309	$	—
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	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
March 31, 2016
Collateral Dependent Impaired Loans	$	1,703	$	—	$	—	$	1,703	$	(260	)
Other Real Estate Owned and Repossessed Assets, Net	2,011		—		—		2,011		(784		)
December 31, 2015
Collateral Dependent Impaired Loans	2,018		—		—		2,018		(687		)
Other Real Estate Owned and Repossessed Assets, Net	—		—		—		—		—
March 31, 2015
Collateral Dependent Impaired Loans	600		—		—		600		(149		)
Other Real Estate Owned and Repossessed Assets, Net	529		—		—		529		(15		)

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, 2016
Cash and Cash Equivalents	$	60,711	$	60,711	$	60,711	$	—	$	—
Securities Available-for-Sale	388,247		388,247		—		388,247		—
Securities Held-to-Maturity	315,284		324,337		—		324,337		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	5,149		5,149		5,149		—		—
Net Loans	1,606,441		1,613,221		—		—		1,613,221
Accrued Interest Receivable	7,156		7,156		7,156		—		—
Deposits	2,115,061		2,109,546		1,925,905		183,641		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	45,155		45,155		45,155		—		—
Federal Home Loan Bank Term Advances	55,000		55,930		—		55,930		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	227		227		227		—		—
December 31, 2015
Cash and Cash Equivalents	$	51,068	$	51,068	$	51,068	$	—	$	—
Securities Available-for-Sale	402,309		402,309		—		402,309		—
Securities Held-to-Maturity	320,611		325,930		—		325,930		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	8,839		8,839		8,839		—		—
Net Loans	1,557,914		1,557,511		—		—		1,557,511
Accrued Interest Receivable	6,360		6,360		6,360		—		—
Deposits	2,030,423		2,024,224		1,840,606		183,618		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	23,173		19,421		19,421		—		—
Federal Home Loan Bank Term Advances	137,000		137,063		82,000		55,063		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	231		231		231		—		—
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		—		—