Guaranteed Preferred Beneficial Interests in Corporation's Junior Subordinated Debentures	12 Months Ended
Dec. 31, 2011
Guaranteed Preferred Beneficial Interests in Corporation's Junior Subordinated Debentures [Abstract]
Long-term Debt [Text Block]	GUARANTEED PREFERRED BENEFICIAL INTERESTS IN CORPORATION’S JUNIOR SUBORDINATED DEBENTURES (In Thousands) During 2011, there were outstanding two classes of financial instruments issued by two separate subsidiary business trusts of Arrow, having an aggregate amount of $20,000, identified as “Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts” on the Consolidated Balance Sheets and the Consolidated Income Statements. The first of the two classes of trust-issued instruments outstanding at year-end was issued by Arrow Capital Statutory Trust II ("ACST II"), a Delaware business trust established on July 16, 2003, upon the filing of a certificate of trust with the Delaware Secretary of State. In July 2003, ACST II issued all of its voting (common) stock to Arrow and issued and sold to an unaffiliated purchaser 30-year guaranteed preferred beneficial interests in the trust's assets ("ACST II trust preferred securities") in the aggregate amount of $10,000. The ACST II trust preferred securities bore a rate of 6.53% through September 30, 2008. After that date the rate became variable, adjusting quarterly to the 3-month LIBOR plus 3.15%. ACST II used the proceeds of the sale of its trust preferred securities to purchase an identical amount ($10,000) of junior subordinated debentures issued by Arrow that bear an interest rate identical at all times to the rate payable on the ACST II trust preferred securities. The ACST II trust preferred securities became redeemable after July 23, 2008. The second of the two classes of trust-issued instruments outstanding at year-end was issued by Arrow Capital Statutory Trust III ("ACST III"), a Delaware business trust established on December 23, 2004, upon the filing of a certificate of trust with the Delaware Secretary of State. On December 28, 2004, the ACST III issued all of its voting (common) stock to Arrow and issued and sold to an unaffiliated purchaser 30-year guaranteed preferred beneficial interests in the trust's assets ("ACST III trust preferred securities") in the aggregate amount of $10,000. The rate on the ACST III trust preferred securities is a variable rate, adjusted quarterly, equal to the 3-month LIBOR plus 2.00%. ACST III used the proceeds of the sale of its trust preferred securities to purchase an identical amount ($10,000) of junior subordinated debentures issued by Arrow that bear an interest rate identical at all times to the rate payable on the ACST III trust preferred securities. The ACST III trust preferred securities became redeemable on or after March 31, 2010. The primary assets of the two subsidiary trusts having trust preferred securities outstanding at year-end, ACST II and ACST III (the “Trusts”), are Arrow's junior subordinated debentures discussed above, and the sole revenues of the Trusts are payments received by them from Arrow with respect to the junior subordinated debentures. The trust preferred securities issued by the Trusts are non-voting. All common voting securities of the Trusts are owned by Arrow. Arrow used the net proceeds from its sale of junior subordinated debentures to the Trusts, facilitated by the Trust’s sale of their trust preferred securities to the purchasers thereof, for general corporate purposes. The trust preferred securities and underlying junior subordinated debentures, with associated expense that is tax deductible, qualify as Tier I capital under regulatory definitions. Arrow's primary source of funds to pay interest on the debentures that are held by the Trusts are current dividends received by Arrow from its subsidiary banks. Accordingly, Arrow's ability to make payments on the debentures, and the ability of the Trusts to make payments on their trust preferred securities, are dependent upon the continuing ability of Arrow's subsidiary banks to pay dividends to Arrow. Since the trust preferred securities issued by the subsidiary trusts and the underlying junior subordinated debentures issued by Arrow at December 31, 2011, 2010 and 2009 are classified as debt for financial statement purposes, the expense associated with these securities is recorded as interest expense in the consolidated statements of income for the three years.

GUARANTEED PREFERRED BENEFICIAL INTERESTS IN CORPORATION’S JUNIOR SUBORDINATED

DEBENTURES (In Thousands)

During 2011, there were outstanding two classes of financial instruments issued by two separate subsidiary business trusts of Arrow, having an aggregate amount of $20,000, identified as “Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts” on the Consolidated Balance Sheets and the Consolidated Income Statements.

The first of the two classes of trust-issued instruments outstanding at year-end was issued by Arrow Capital Statutory Trust II ("ACST II"), a Delaware business trust established on July 16, 2003, upon the filing of a certificate of trust with the Delaware Secretary of State. In July 2003, ACST II issued all of its voting (common) stock to Arrow and issued and sold to an unaffiliated purchaser 30-year guaranteed preferred beneficial interests in the trust's assets ("ACST II trust preferred securities") in the aggregate amount of $10,000. The ACST II trust preferred securities bore a rate of 6.53% through September 30, 2008. After that date the rate became variable, adjusting quarterly to the 3-month LIBOR plus 3.15%. ACST II used the proceeds of the sale of its trust preferred securities to purchase an identical amount ($10,000) of junior subordinated debentures issued by Arrow that bear an interest rate identical at all times to the rate payable on the ACST II trust preferred securities. The ACST II trust preferred securities became redeemable after July 23, 2008.

The second of the two classes of trust-issued instruments outstanding at year-end was issued by Arrow Capital Statutory Trust III ("ACST III"), a Delaware business trust established on December 23, 2004, upon the filing of a certificate of trust with the Delaware Secretary of State. On December 28, 2004, the ACST III issued all of its voting (common) stock to Arrow and issued and sold to an unaffiliated purchaser 30-year guaranteed preferred beneficial interests in the trust's assets ("ACST III trust preferred securities") in the aggregate amount of $10,000. The rate on the ACST III trust preferred securities is a variable rate, adjusted quarterly, equal to the 3-month LIBOR plus 2.00%. ACST III used the proceeds of the sale of its trust preferred securities to purchase an identical amount ($10,000) of junior subordinated debentures issued by Arrow that bear an interest rate identical at all times to the rate payable on the ACST III trust preferred securities. The ACST III trust preferred securities became redeemable on or after March 31, 2010.

The primary assets of the two subsidiary trusts having trust preferred securities outstanding at year-end, ACST II and ACST III (the “Trusts”), are Arrow's junior subordinated debentures discussed above, and the sole revenues of the Trusts are payments received by them from Arrow with respect to the junior subordinated debentures. The trust preferred securities issued by the Trusts are non-voting. All common voting securities of the Trusts are owned by Arrow. Arrow used the net proceeds from its sale of junior subordinated debentures to the Trusts, facilitated by the Trust’s sale of their trust preferred securities to the purchasers thereof, for general corporate purposes. The trust preferred securities and underlying junior subordinated debentures, with associated expense that is tax deductible, qualify as Tier I capital under regulatory definitions.

Arrow's primary source of funds to pay interest on the debentures that are held by the Trusts are current dividends received by Arrow from its subsidiary banks. Accordingly, Arrow's ability to make payments on the debentures, and the ability of the Trusts to make payments on their trust preferred securities, are dependent upon the continuing ability of Arrow's subsidiary banks to pay dividends to Arrow. Since the trust preferred securities issued by the subsidiary trusts and the underlying junior subordinated debentures issued by Arrow at December 31, 2011, 2010 and 2009 are classified as debt for financial statement purposes, the expense associated with these securities is recorded as interest expense in the consolidated statements of income for the three years.