Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 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:
June 30, 2016
Securities Available-for Sale:
U.S. Agency Obligations	$	157,990	$	—	$	157,990	$	—
State and Municipal Obligations	36,425		—		36,425		—
Mortgage-Backed Securities - Residential	161,728		—		161,728		—
Corporate and Other Debt Securities	5,555		—		5,555		—
Mutual Funds and Equity Securities	1,231		—		1,231		—
Total Securities Available-for-Sale	$	362,929	$	—	$	362,929	$	—
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	$	—
June 30, 2015
Securities Available-for Sale:
U.S. Agency Obligations	$	156,937	$	—	$	156,937	$	—
State and Municipal Obligations	59,303		—		59,303		—
Mortgage-Backed Securities - Residential	157,641		—		157,641		—
Corporate and Other Debt Securities	16,691		—		16,691		—
Mutual Funds and Equity Securities	1,245		—		1,245		—
Total Securities Available-for Sale	$	391,817	$	—	$	391,817	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
June 30, 2016
Collateral Dependent Impaired Loans	$	1,692	$	—	$	—	$	1,692	$	(250	)
Other Real Estate Owned and Repossessed Assets, Net	933		—		—		933		(732		)
December 31, 2015
Collateral Dependent Impaired Loans	$	—	$	—	$	—	$	—
Other Real Estate Owned and Repossessed Assets, Net	2,018		—		—		2,018		(687		)
June 30, 2015
Collateral Dependent Impaired Loans	$	308	$	—	$	—	$	308	$	(78	)
Other Real Estate Owned and Repossessed Assets, Net	594		—		—		594		(144		)

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, 2016
Cash and Cash Equivalents	$	63,115	$	63,115	$	63,115	$	—	$	—
Securities Available-for-Sale	362,929		362,929		—		362,929		—
Securities Held-to-Maturity	343,814		354,778		—		354,778		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	9,961		9,961		9,961		—		—
Net Loans	1,655,692		1,664,713		—		—		1,664,713
Accrued Interest Receivable	6,383		6,383		6,383		—		—
Deposits	2,072,385		2,067,328		1,869,865		197,463		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	41,497		41,497		41,497		—		—
Federal Home Loan Bank Overnight Advances	102,000		102,000		102,000		—		—
Federal Home Loan Bank Term Advances	55,000		56,145		—		56,145		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	231		231		231		—		—
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 Overnight Advances	82,000		82,000		82,000		—		—
Federal Home Loan Bank Term Advances	55,000		55,063		—		55,063		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	231		231		231		—		—
June 30, 2015
Cash and Cash Equivalents	$	45,137	$	45,137	$	45,137	$	—	$	—
Securities Available-for-Sale	391,817		391,817		—		391,817		—
Securities Held-to-Maturity	324,116		328,361		—		328,361		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	6,470		6,470		6,470		—		—
Net Loans	1,464,096		1,469,427		—		—		1,469,427
Accrued Interest Receivable	6,007		6,007		6,007		—		—
Deposits	1,972,484		1,966,671		1,777,645		189,026		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	15,895		15,895		15,895		—		—
Federal Home Loan Bank Overnight Advances	29,500		29,500		29,500		—		—
Federal Home Loan Bank Term Advances	55,000		55,400		—		55,400		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	289		289		289		—		—