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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value $ 1,743,309 $ 1,291,480
Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 466,145 526,165
Total Assets 466,145 526,165
Total Liabilities 0 0
Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 1,277,164 765,315
Total Assets 1,287,835 772,942
Total Liabilities 4,726 1,588
Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Total Assets 49 104
Total Liabilities 0 0
Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 1,743,309 1,291,480
Total Assets 1,754,029 1,299,211
Total Liabilities 4,726 1,588
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 460,333 509,971
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   0
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 460,333 509,971
US Treasury Securities [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 460,333 509,971
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 1,095,019 416,694
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Mortgage-backed Securities [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 1,095,019 416,694
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 6,697 10,168
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Collateralized Mortgage Obligations [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 6,697 10,168
Collateralized Mortgage Obligations [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 6,697 10,168
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 128 141
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Asset-backed Securities [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 128 141
Asset-backed Securities [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 128 141
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 167,840 335,977
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 167,840 335,977
Corporate Debt Securities [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 167,840 335,977
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 5,812 6,079
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Mutual Funds [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 5,812 6,079
Mutual Funds [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 5,812 6,079
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 7,480 2,335
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 0 0
Preferred Stock Of Government Sponsored Entities Member | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 7,480 2,335
Preferred Stock Of Government Sponsored Entities Member
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value 7,480 2,335
Trading Securities Member | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0 0
Trading Securities Member | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 4,855 4,703
Trading Securities Member | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0 0
Trading Securities Member | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 4,855 4,703
Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0 0
Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0 0
Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 49 104
Warrant [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 49 104
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0 0
Total Liabilities 0 0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 5,816 2,924
Total Liabilities 4,725 1,586
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0 0
Total Liabilities 0 0
Foreign Exchange Contract [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 5,816 2,924
Total Liabilities 4,725 1,586
Option Contracts Member | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0  
Total Liabilities   0
Option Contracts Member | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 1  
Total Liabilities   2
Option Contracts Member | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 0  
Total Liabilities   0
Option Contracts Member | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Total Assets 1  
Total Liabilities   2
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   10,115
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   0
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   0
Trust Preferred Securities [Member] | Estimate of Fair Value Measurement [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   10,115
Trust Preferred Securities [Member]
    
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Available-for-sale Securities - Fair Value   $ 10,115