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Note 17 - Fair Value of Financial Instruments (Detail) - Assets and liabilities carried at fair value on a recurring basis, classified within Level 3 of the valuation hierarchy: (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
REMIC And CMO [Member]
   
Transfer into Level 3 $ 23,475  
Balance, Assets 23,475  
Municipals [Member]
   
Transfer into Level 3 9,429  
Balance, Assets 9,429  
Trust Preferred Securities [Member]
   
Balance, Assets 5,632 10,144
Net gain (loss) from fair value adjustment of financial assets 233 (1,577)
Decrease in accrued interest receivable (10)  
Change in unrealized gains(losses) included in other comprehensive income 795 (2,935)
Balance, Assets 6,650 5,632
Junior Subordinated Debentures [Member]
   
Balance, Liabilities 26,311 32,226
Net gain from fair value adjustment of financial liabilities (2,062)  
Decrease in accrued interest receivable   (5,915)
Decrease in accrued interest payable (327)  
Balance, Liabilities $ 23,922 $ 26,311