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Note 4 - Debt and Equity Securities (Details) - Securities available for sale: (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost $ 1,061,918 $ 915,947
Fair Value 1,058,554 949,566
Gross Unrealized Gains 20,478 41,391
Gross Unrealized Losses 23,842 7,772
Corporate Debt Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 122,883 83,389
Fair Value 125,922 87,485
Gross Unrealized Gains 3,982 4,096
Gross Unrealized Losses 943  
Municipal [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 116,105 74,228
Fair Value 112,164 75,297
Gross Unrealized Gains 213 1,152
Gross Unrealized Losses 4,154 83
Mutual Funds [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 21,631 21,843
Fair Value 21,631 21,843
Other Debt Obligations [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 17,422 17,797
Fair Value 13,627 13,315
Gross Unrealized Gains   17
Gross Unrealized Losses 3,795 4,499
Available For Sale Securities Excluding Mortgage Backed Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 278,041 228,666
Fair Value 273,344 229,453
Gross Unrealized Gains 4,195 5,369
Gross Unrealized Losses 8,892 4,582
REMIC And CMO [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 524,071 453,468
Fair Value 525,819 474,050
Gross Unrealized Gains 10,464 23,690
Gross Unrealized Losses 8,716 3,108
GNMA [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 41,334 43,211
Fair Value 43,431 46,932
Gross Unrealized Gains 2,458 3,721
Gross Unrealized Losses 361  
FNMA [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 204,573 168,040
Fair Value 201,909 175,929
Gross Unrealized Gains 3,089 7,971
Gross Unrealized Losses 5,753 82
FHLMC [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 13,899 22,562
Fair Value 14,051 23,202
Gross Unrealized Gains 272 640
Gross Unrealized Losses 120  
Collateralized Mortgage Backed Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost 783,877 687,281
Fair Value 785,210 720,113
Gross Unrealized Gains 16,283 36,022
Gross Unrealized Losses 14,950 3,190
US Government Agencies Debt Securities [Member]
    
Note 4 - Debt and Equity Securities (Details) - Securities available for sale: [Line Items]    
Amortized Cost   31,409
Fair Value   31,513
Gross Unrealized Gains   $ 104