Note 9 - Fair Value Measurement (Detail) - Assets Measured At Fair Value On A Non-Recurring Basis (USD $)	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012	Dec. 31, 2011
Impaired loans, net	$ 437,518,000				$ 526,800,000
Other loans held for sale			24,438,107
Other real estate owned	11,327,672		12,892,519		17,324,000	17,005,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired loans, net	33,913,000	[1]	36,605,000	[2]
Other loans held for sale			24,438,000
Other real estate owned	11,328,000		12,893,000
Total	45,241,000		73,936,000
Fair Value, Inputs, Level 1 [Member]
Impaired loans, net		[1]		[2]
Fair Value, Inputs, Level 2 [Member]
Impaired loans, net	33,913,000	[1]	36,605,000	[2]
Total	33,913,000		36,605,000
Fair Value, Inputs, Level 3 [Member]
Impaired loans, net		[1]		[2]
Other loans held for sale			24,438,000
Other real estate owned	11,328,000		12,893,000
Total	$ 11,328,000		$ 37,331,000

[1] Includes $29.0 million of loans identified as impaired, even though an impairment analysis calculated pursuant to ASC 310-10-35 (formerly FAS 114) resulted in no impairment loss recognition.

[2] Includes $30.1 million of loans identified as impaired, even though an impairment analysis calculated pursuant to ASC 310-10-35 (formerly FAS 114) resulted in no impairment loss recognition.