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Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Equity securities | $ 23,744 |  | $ 28,005
Warrants | 3,409 |  | 2,181
Equity Securities, FV-NI | 23,744 |  | 28,005
Fair Value, Inputs, Level 1 [Member] |  |  |
Equity securities | 23,744 |  | 28,005
Equity Securities, FV-NI | 23,744 |  | 28,005
Fair Value, Inputs, Level 2 [Member] |  |  |
Equity securities | 0 |  | 0
Equity Securities, FV-NI | 0 |  | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Equity securities | 0 |  | 0
Equity Securities, FV-NI | 0 |  | 0
Estimate of Fair Value Measurement [Member] |  |  |
Cash and due from banks | 138,616 |  | 177,240
Short-term investments | 1,282,462 |  | 416,538
Securities available-for-sale | 1,036,550 |  | 1,451,842
Loans, net | 16,103,471 | [1] | 15,444,752
Equity securities | 23,744 |  | 28,005
Investment in Federal Home Loan Bank stock | 17,250 |  | 18,090
Deposits | 16,125,808 |  | 14,719,452
Advances from Federal Home Loan Bank | 155,133 |  | 674,530
Other borrowings | 19,632 |  | 30,764
Long-term debt | 65,487 |  | 76,058
Equity Securities, FV-NI | 23,744 |  | 28,005
Short-term borrowings | 0 |  | 25,683
Estimate of Fair Value Measurement [Member] | Warrants [Member] |  |  |
Warrants | 21 |  | 39
Warrants |  |  | 39
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and due from banks | 138,616 |  | 177,240
Short-term investments | 1,282,462 |  | 416,538
Securities available-for-sale | 80,948 |  | 74,936
Loans, net | 0 | [1] | 0
Equity securities | 23,744 |  | 28,005
Investment in Federal Home Loan Bank stock | 0 |  | 0
Deposits | 0 |  | 0
Advances from Federal Home Loan Bank | 0 |  | 0
Other borrowings | 0 |  | 0
Long-term debt | 0 |  | 0
Equity Securities, FV-NI | 23,744 |  | 28,005
Short-term borrowings |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Warrants [Member] |  |  |
Warrants | 0 |  |
Warrants |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and due from banks | 0 |  | 0
Short-term investments | 0 |  | 0
Securities available-for-sale | 955,602 |  | 1,376,906
Loans, net | 0 | [1] | 0
Equity securities | 0 |  | 0
Investment in Federal Home Loan Bank stock | 17,250 |  | 18,090
Deposits | 0 |  | 0
Advances from Federal Home Loan Bank | 155,133 |  | 674,530
Other borrowings | 0 |  | 0
Long-term debt | 65,487 |  | 76,058
Equity Securities, FV-NI | 0 |  | 0
Short-term borrowings |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Warrants [Member] |  |  |
Warrants | 0 |  |
Warrants |  |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and due from banks | 0 |  | 0
Short-term investments | 0 |  | 0
Securities available-for-sale | 0 |  | 0
Loans, net | 16,103,471 | [1] | 15,444,752
Equity securities | 0 |  | 0
Investment in Federal Home Loan Bank stock | 0 |  | 0
Deposits | 16,125,808 |  | 14,719,452
Advances from Federal Home Loan Bank | 0 |  | 0
Other borrowings | 19,632 |  | 30,764
Long-term debt | 0 |  | 0
Equity Securities, FV-NI | 0 |  | 0
Short-term borrowings |  |  | 25,683
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants [Member] |  |  |
Warrants | $ 21 |  |
Warrants |  |  | $ 39
[1] | In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2019 & 2018 was measured using an exit 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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