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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.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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