Note 7 - Premises, Furniture, and Equipment (Detail) - Premises, Furniture, and Equipment (USD $) In Thousands, unless otherwise specified			12 Months Ended			12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Land [Member] Minimum [Member]	Dec. 31, 2012 Land [Member]	Dec. 31, 2011 Land [Member]	Dec. 31, 2012 Premises [Member] Minimum [Member]	Dec. 31, 2012 Premises [Member] Maximum [Member]	Dec. 31, 2012 Premises [Member]	Dec. 31, 2011 Premises [Member]	Dec. 31, 2012 Furniture and Equipment [Member] Minimum [Member]	Dec. 31, 2012 Furniture and Equipment [Member] Maximum [Member]	Dec. 31, 2012 Furniture and Equipment [Member]	Dec. 31, 2011 Furniture and Equipment [Member]
Land			0 years			25 years	25 years			3 years	3 years
Land				$ 49,744	$ 50,895
Premises			0 years			25 years	25 years			3 years	3 years
Premises								143,441	147,065
Furniture and equipment			0 years			25 years	25 years			3 years	3 years
Furniture and equipment												75,481	72,279
Total cost	268,666	270,239
Accumulated depreciation	(148,738)	(143,195)
Net book value of premises, furniture, and equipment held-for-investment	119,928	127,044
Assets held-for-sale	1,668	7,933
Total premises, furniture, and equipment	$ 121,596	$ 134,977