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Note 12 - Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Short-term investments $ 393,895 $ 967,067
Available-for-sale Securities 1,368,351 1,314,345 [1]
Loans held-for-sale 7,500
Loans, net 11,379,583 11,006,344
Investment in Federal Home Loan Bank stock 17,250 17,250
Warrants 108 79
Deposits 11,470,912 11,680,017
Securities sold under agreements to repurchase 150,842 351,989
Advances from Federal Home Loan Bank 475,058 350,062
Other borrowings 15,570 15,944
Long-term debt 63,337 63,169
Cash and due from banks 160,517 218,017
Fair Value, Inputs, Level 1 [Member]    
Short-term investments 393,895 967,067
Available-for-sale Securities 591,403 513,376 [1]
Loans held-for-sale
Loans, net
Investment in Federal Home Loan Bank stock
Warrants
Deposits
Securities sold under agreements to repurchase
Advances from Federal Home Loan Bank
Other borrowings
Long-term debt
Cash and due from banks 160,517 218,017
Fair Value, Inputs, Level 2 [Member]    
Short-term investments
Available-for-sale Securities 776,948 800,969 [1]
Loans held-for-sale
Loans, net
Investment in Federal Home Loan Bank stock 17,250 17,250
Warrants
Deposits
Securities sold under agreements to repurchase 150,842 351,989
Advances from Federal Home Loan Bank 475,058 350,062
Other borrowings
Long-term debt 63,337 63,169
Cash and due from banks
Fair Value, Inputs, Level 3 [Member]    
Short-term investments
Available-for-sale Securities [1]
Loans held-for-sale 7,500
Loans, net 11,379,583 11,006,344
Investment in Federal Home Loan Bank stock
Warrants 108 79
Deposits 11,470,912 11,680,017
Securities sold under agreements to repurchase
Advances from Federal Home Loan Bank
Other borrowings 15,570 15,944
Long-term debt
Cash and due from banks
[1] Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.