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Note 17 - Fair Value Measurements - Fair Value of Financial Assets Measure on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale securities | $ 1,589,517 | $ 1,157,354
Assets held in trading accounts |  | 41
Fair Value, Measurements, Recurring [Member] |  |
Other assets held for sale | 165,780 |
Derivative asset | 3,634 | 1,199
Other liabilities held for sale | (157,366) |
Derivative liability | (3,068) | (1,274)
Assets held in trading accounts |  | 41
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Other assets held for sale |  |
Derivative asset |  |
Other liabilities held for sale |  |
Derivative liability |  |
Assets held in trading accounts |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Other assets held for sale |  |
Derivative asset | 3,634 | 1,199
Other liabilities held for sale |  |
Derivative liability | (3,068) | (1,274)
Assets held in trading accounts |  | 41
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Other assets held for sale | 165,780 |
Derivative asset |  |
Other liabilities held for sale | (157,366) |
Derivative liability |  |
Assets held in trading accounts |  |
US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities | 139,724 | 137,771
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities | 139,724 | 137,771
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  |
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities | 139,724 | 137,771
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Available-for-sale securities | 1,187,317 | 868,324
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities | 1,187,317 | 868,324
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities | 1,187,317 | 868,324
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities | 143,165 | 102,943
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities | 143,165 | 102,943
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities | 143,165 | 102,943
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |
Other Securities [Member] |  |
Available-for-sale securities | 119,311 | 48,016
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Other securities | 119,311 | 48,016
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Other securities |  |
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Other securities | 119,311 | 48,016
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Other securities |  |
US Treasury Securities [Member] |  |
Available-for-sale securities |  | 300
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities |  | 300
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available-for-sale securities |  | 300
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available-for-sale securities |  |
US Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available-for-sale securities |  |

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