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Note 3 - Investment Securities (Detail) - Securities with Unrealized Losses (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Held-to-Maturity Securities Less Than 12 Months Estimated Fair Value $ 42,689
Held-to-Maturity Securities Less Than 12 Months Gross Unrealized Losses (39)
Held-to-Maturity Securities 12 Months or More Estimated Fair Value 657
Held-to-Maturity Securities 12 Months or More Gross Unrealized Losses (90)
Held-to-Maturity Securities Estimated Fair Value 43,346
Held-to-Maturity Securities Gross Unrealized Losses (129)
Available-for-Sale Securities Less Than 12 Months Estimated Fair Value 34,302
Available-for-Sale Securities Less Than 12 Months Gross Unrealized Losses (52)
Available-for-Sale Securities Estimated Fair Value 34,302
Available-for-Sale Securities Gross Unrealized Losses (52)
US Government Agencies Debt Securities [Member]
 
Held-to-Maturity Securities Less Than 12 Months Estimated Fair Value 38,991
Held-to-Maturity Securities Less Than 12 Months Gross Unrealized Losses (32)
Held-to-Maturity Securities 12 Months or More Estimated Fair Value 0
Held-to-Maturity Securities 12 Months or More Gross Unrealized Losses 0
Held-to-Maturity Securities Estimated Fair Value 38,991
Held-to-Maturity Securities Gross Unrealized Losses (32)
Available-for-Sale Securities Less Than 12 Months Estimated Fair Value 32,971
Available-for-Sale Securities Less Than 12 Months Gross Unrealized Losses (29)
Available-for-Sale Securities Estimated Fair Value 32,971
Available-for-Sale Securities Gross Unrealized Losses (29)
US States and Political Subdivisions Debt Securities [Member]
 
Held-to-Maturity Securities Less Than 12 Months Estimated Fair Value 3,698
Held-to-Maturity Securities Less Than 12 Months Gross Unrealized Losses (7)
Held-to-Maturity Securities 12 Months or More Estimated Fair Value 657
Held-to-Maturity Securities 12 Months or More Gross Unrealized Losses (90)
Held-to-Maturity Securities Estimated Fair Value 4,355
Held-to-Maturity Securities Gross Unrealized Losses (97)
Available-for-Sale Securities Less Than 12 Months Estimated Fair Value 1,330
Available-for-Sale Securities Less Than 12 Months Gross Unrealized Losses (19)
Available-for-Sale Securities Estimated Fair Value 1,330
Available-for-Sale Securities Gross Unrealized Losses (19)
Other Securities [Member]
 
Available-for-Sale Securities Less Than 12 Months Estimated Fair Value 1
Available-for-Sale Securities Less Than 12 Months Gross Unrealized Losses (4)
Available-for-Sale Securities 12 Months or More Estimated Fair Value 0
Available-for-Sale Securities 12 Months or More Gross Unrealized Losses 0
Available-for-Sale Securities Estimated Fair Value 1
Available-for-Sale Securities Gross Unrealized Losses $ (4)