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Note 16 - Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and due from banks |  | $ 225,333,000 | $ 247,056,000
Short-term investments |  | 374,957,000 | 292,745,000
Securities available-for-sale |  | 1,242,509,000 | 1,333,626,000
Loans, net (1) | [1] | 13,928,162,000 | 12,663,049,000
Equity securities |  | 25,098,000 | 28,100,000
Investment in Federal Home Loan Bank stock |  | 17,250,000 | 23,085,000
Warrants |  | 7,810,000 | 5,218,000
Deposits |  | 13,754,028,000 | 12,700,674,000
Advances from Federal Home Loan Bank |  | 529,500,000 | 429,482,000
Other borrowings |  | 34,031,000 | 51,075,000
Long-term debt |  | 132,615,000 | 141,865,000
Loans held-for-sale |  |  | 8,000,000
Securities sold under agreement to repurchase |  |  | 100,163,000
Warrants [Member] |  |  |
Warrants |  | 184,000 |
Warrants |  |  | 91,000
Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and due from banks |  | 225,333,000 | 247,056,000
Short-term investments |  | 374,957,000 | 292,745,000
Securities available-for-sale |  | 124,751,000 | 277,622,000
Loans, net (1) | [1] |  |
Equity securities |  | 25,098,000 |
Investment in Federal Home Loan Bank stock |  |  |
Deposits |  |  |
Advances from Federal Home Loan Bank |  |  |
Other borrowings |  |  |
Long-term debt |  |  |
Loans held-for-sale |  |  |
Securities sold under agreement to repurchase |  |  |
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 |  | 1,117,758,000 | 1,056,004,000
Loans, net (1) | [1] |  |
Equity securities |  |  |
Investment in Federal Home Loan Bank stock |  | 17,250,000 | 23,085,000
Deposits |  |  |
Advances from Federal Home Loan Bank |  | 529,500,000 | 429,482,000
Other borrowings |  |  |
Long-term debt |  | 132,615,000 | 141,865,000
Loans held-for-sale |  |  |
Securities sold under agreement to repurchase |  |  | 100,163,000
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) | [1] | 13,928,162,000 | 12,663,049,000
Equity securities |  |  |
Investment in Federal Home Loan Bank stock |  |  |
Deposits |  | 13,754,028,000 | 12,700,674,000
Advances from Federal Home Loan Bank |  |  |
Other borrowings |  | 34,031,000 | 51,075,000
Long-term debt |  |  |
Loans held-for-sale |  |  | 8,000,000
Securities sold under agreement to repurchase |  |  |
Fair Value, Inputs, Level 3 [Member] | Warrants [Member] |  |  |
Warrants |  | $ 184,000 |
Warrants |  |  | $ 91,000
[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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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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