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Note 16 - Stockholders' Equity (Details) - Accumulated Other Comprehensive Income - Six Months (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Mar. 31, 2014
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Dec. 31, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Jun. 30, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Mar. 31, 2013
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Dec. 31, 2012
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Jun. 30, 2014
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning balance, net of tax                      
Accumulated Other Comprenhensive Income, Net of Tax $ (22,090,000) $ 23,477,000 $ (29,729,000) $ 465,000 $ (8,633,000) $ (22,090,000) $ (29,729,000) $ (15,073,000) $ 23,477,000 $ 465,000 $ (263,000)
Net unrealized losses arising during the period                      
Securities available-for sale 23,724,000 (54,334,000) 42,867,000 (46,391,000)              
Securities available-for sale 9,974,000 (22,842,000) 18,023,000 (19,503,000)              
Securities available-for sale 13,750,000 (31,492,000) 24,844,000 (4,833,000)              
Cash flow hedge derivatives (454,000)   (454,000)                
Cash flow hedge derivatives (191,000)   (191,000)                
Cash flow hedge derivatives (263,000)   (263,000)                
Total 23,270,000 (54,334,000) 42,413,000 (46,391,000)              
Total 9,783,000 (22,842,000) 17,832,000 (19,503,000)              
Total 13,487,000 (31,492,000) 24,581,000 (26,888,000)              
Reclassification adjustment for net gains/(losses) in net income                      
Securities available-for sale (506,000) (12,177,000) (6,466,000) (18,469,000)              
Securities available-for sale (213,000) (5,119,000) (2,718,000) (7,764,000)              
Securities available-for sale (293,000) (7,058,000) (3,748,000) (10,705,000)              
Total (506,000) (12,177,000) (6,466,000) (18,469,000)              
Total (213,000) (5,119,000) (2,718,000) (7,764,000)              
Total (293,000) (7,058,000) (3,748,000) (10,705,000)              
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale       38,052,000              
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale       15,997,000              
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale       22,055,000              
Total other comprehensive income                      
Securities available-for sale 23,218,000 (66,511,000) 36,401,000 (26,808,000)              
Securities available-for sale     15,305,000 (11,270,000)              
Securities available-for sale 13,457,000 (38,550,000) 21,096,000 (15,538,000)              
Cash flow hedge derivatives (454,000)   (454,000)                
Cash flow hedge derivatives (191,000)   (191,000)                
Cash flow hedge derivatives (263,000)   (263,000)                
Total 22,764,000 (66,511,000) 35,947,000 (26,808,000)              
Total 9,570,000 (27,961,000) 15,114,000 (11,270,000)              
Total 13,194,000 (38,550,000) 20,833,000 (15,538,000)              
Ending balance, net of tax                      
Accumulated Other Comprenhensive Income, Net of Tax $ (8,896,000) $ (15,073,000) $ (8,896,000) $ (15,073,000) $ (8,633,000) $ (22,090,000) $ (29,729,000) $ (15,073,000) $ 23,477,000 $ 465,000 $ (263,000)