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Note 14 - Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Cash and due from banks $ 194,928 $ 225,333
Short-term investments 343,452 374,957
Securities available-for-sale 1,309,853 1,242,509
Loans, net [1] 14,373,444 13,928,162
Equity securities 29,261 25,098
Investment in Federal Home Loan Bank stock 17,250 17,250
Warrants 4,480 7,810
Deposits 14,143,470 13,754,028
Advances from Federal Home Loan Bank 420,450 529,500
Other borrowings 42,361 34,031
Long-term debt 123,897 132,615
Equity Securities, FV-NI 29,261 25,098
Warrants [Member]    
Warrants 181  
Warrants   184
Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 194,928 225,333
Short-term investments 343,452 374,957
Securities available-for-sale 149,240 124,751
Loans, net [1]
Equity securities 29,261 25,098
Investment in Federal Home Loan Bank stock
Deposits
Advances from Federal Home Loan Bank
Other borrowings
Long-term debt
Equity Securities, FV-NI 29,261 25,098
Fair Value, Inputs, Level 1 [Member] | Warrants [Member]    
Warrants  
Warrants  
Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks
Short-term investments
Securities available-for-sale 1,160,613 1,117,758
Loans, net [1]
Equity securities
Investment in Federal Home Loan Bank stock 17,250 17,250
Deposits
Advances from Federal Home Loan Bank 420,450 529,500
Other borrowings
Long-term debt 123,897 132,615
Equity Securities, FV-NI
Fair Value, Inputs, Level 2 [Member] | Warrants [Member]    
Warrants  
Warrants  
Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks
Short-term investments
Securities available-for-sale
Loans, net [1] 14,373,444 13,928,162
Equity securities
Investment in Federal Home Loan Bank stock
Deposits 14,143,470 13,754,028
Advances from Federal Home Loan Bank
Other borrowings 42,361 34,031
Long-term debt
Equity Securities, FV-NI
Fair Value, Inputs, Level 3 [Member] | Warrants [Member]    
Warrants $ 181  
Warrants   $ 184
[1] In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2018 was measured using an exit price notion. The fair value of loans as of December 31, 2017 was measured using an entry price notion.