Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 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:
September 30, 2016
Securities Available-for Sale:
U.S. Agency Obligations	$	153,926	$	—	$	153,926	$	—
State and Municipal Obligations	31,628		—		31,628		—
Mortgage-Backed Securities - Residential	148,087		—		148,087		—
Corporate and Other Debt Securities	4,299		—		4,299		—
Mutual Funds and Equity Securities	1,250		—		1,250		—
Total Securities Available-for-Sale	$	339,190	$	—	$	339,190	$	—
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	$	—
September 30, 2015
Securities Available-for Sale:
U.S. Agency Obligations	$	162,518	$	—	$	162,518	$	—
State and Municipal Obligations	55,486		—		55,486		—
Mortgage-Backed Securities - Residential	161,637		—		161,637		—
Corporate and Other Debt Securities	16,672		—		16,672		—
Mutual Funds and Equity Securities	1,246		—		1,246		—
Total Securities Available-for Sale	$	397,559	$	—	$	397,559	$	—
Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis:
September 30, 2016
Collateral Dependent Impaired Loans	$	2,640	$	—	$	—	$	2,640	$	(240	)
Other Real Estate Owned and Repossessed Assets, Net	1,016		—		—		1,016		(319		)
December 31, 2015
Collateral Dependent Impaired Loans	$	—	$	—	$	—	$	—	$	—
Other Real Estate Owned and Repossessed Assets, Net	2,018		—		—		2,018		(687		)
September 30, 2015
Collateral Dependent Impaired Loans	$	902	$	—	$	—	$	902	$	(322	)
Other Real Estate Owned and Repossessed Assets, Net	585		—		—		585		(135		)

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
September 30, 2016
Cash and Cash Equivalents	$	102,059	$	102,059	$	102,059	$	—	$	—
Securities Available-for-Sale	339,190		339,190		—		339,190		—
Securities Held-to-Maturity	338,238		347,441		—		347,441		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	5,371		5,371		5,371		—		—
Net Loans	1,690,241		1,696,929		—		—		1,696,929
Accrued Interest Receivable	7,046		7,046		7,046		—		—
Deposits	2,213,187		2,207,985		2,004,182		203,803		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	38,589		38,589		38,589		—		—
Federal Home Loan Bank Overnight Advances	—		—		—		—		—
Federal Home Loan Bank Term Advances	55,000		55,955		—		55,955		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	247		247		247		—		—
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		—		—
September 30, 2015
Cash and Cash Equivalents	$	69,691	$	69,691	$	69,691	$	—	$	—
Securities Available-for-Sale	397,559		397,559		—		397,559		—
Securities Held-to-Maturity	317,480		324,009		—		324,009		—
Federal Home Loan Bank and Federal   Reserve Bank Stock	5,143		5,143		5,143		—		—
Net Loans	1,521,151		1,530,930		—		—		1,530,930
Accrued Interest Receivable	6,949		6,949		6,949		—		—
Deposits	2,082,051		2,076,658		1,887,237		189,421		—
Federal Funds Purchased and Securities   Sold Under Agreements to Repurchase	24,414		24,414		24,414		—		—
Federal Home Loan Bank Overnight Advances	—		—		—		—		—
Federal Home Loan Bank Term Advances	55,000		56,630		—		56,630		—
Junior Subordinated Obligations Issued   to Unconsolidated Subsidiary Trusts	20,000		20,000		—		20,000		—
Accrued Interest Payable	306		306		306		—		—