Note 9 - Accumulated Other Comprehensive Income (Detail) - Tax Effects Allocated to Each Component of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Before Tax Amount	$ 659	$ 2,120	$ 746	$ 1,664
Tax Expense (Benefit)	238	763	269	599
Net of Tax Amount	421	1,357	477	1,065
Change in Accumulated Gain (Loss) on Effective Cash Flow Derivatives [Member]
Before Tax Amount	(15)	(377)	53	(144)
Tax Expense (Benefit)	(6)	(136)	19	(52)
Net of Tax Amount	(9)	(241)	34	(92)
Securities With OTTI Charges During the Period [Member]
Before Tax Amount	(48)	(78)	(87)	(183)
Tax Expense (Benefit)	(17)	(28)	(31)	(66)
Net of Tax Amount	(31)	(50)	(56)	(117)
OTTI Charges Recognized in Net Income [Member]
Before Tax Amount	(38)	(77)	(77)	(165)
Tax Expense (Benefit)	(13)	(28)	(27)	(60)
Net of Tax Amount	(25)	(49)	(50)	(105)
Net Unrealized Losses on Investment Securities With OTTI [Member]
Before Tax Amount	(10)	(1)	(10)	(18)
Tax Expense (Benefit)	(4)		(4)	(6)
Net of Tax Amount	(6)	(1)	(6)	(12)
Unrealized Holding Gain Arising During the Period [Member]
Before Tax Amount	756	2,474	787	1,752
Tax Expense (Benefit)	274	890	284	630
Net of Tax Amount	482	1,584	503	1,122
Reclassification Adjustment for Gain (Loss) Included in Net Income [Member]
Before Tax Amount	72	(24)	84	(74)
Tax Expense (Benefit)	26	(9)	30	(27)
Net of Tax Amount	46	(15)	54	(47)
Net Unrealized Gains on Investment Securities [Member]
Before Tax Amount	684	2,498	703	1,826
Tax Expense (Benefit)	248	899	254	657
Net of Tax Amount	$ 436	$ 1,599	$ 449	$ 1,169