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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
Jun. 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 $ 2,018,305 $ 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 415,874 526,165
Total Assets 415,874 526,165
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 1,602,431 765,315
Total Assets 1,610,479 772,942
Total Liabilities 6,233 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 72 104
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 2,018,305 1,291,480
Total Assets 2,026,425 1,299,211
Total Liabilities 6,233 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 410,035 509,971
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 410,035 509,971
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 410,035 509,971
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 1,405,348 416,694
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 1,405,348 416,694
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 7,668 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 7,668 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 7,668 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 133 141
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 133 141
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 133 141
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 182,826 335,977
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 182,826 335,977
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 182,826 335,977
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 5,839 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 5,839 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 5,839 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 6,456 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 6,456 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 6,456 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 4,816 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 4,816 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 72 104
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 72 104
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 55  
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 55  
Total Liabilities   2
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 3,177 2,924
Total Liabilities 6,233 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 3,177 2,924
Total Liabilities 6,233 1,586
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