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Note 11 - Derivative Financial Instruments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Junior Subordinated Notes $ 34,536   $ 33,959
Derivative Asset, Notional Amount 285,384   253,414
Fair Value, Option, Changes in Fair Value, Gain (Loss) (378) $ (987)  
Unrealized Gain (Loss) on Derivatives 0 0  
Financial Assets and Liabilities, Excluding Interest Rate Caps / Swaps [Member]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (545) $ 1,155  
Not Designated as Hedging Instrument [Member]      
Derivative Asset, Notional Amount     36,300
Designated as Hedging Instrument [Member]      
Derivative Asset, Notional Amount 249,100   217,100
Interest Rate Swap [Member]      
Derivative Asset, Notional Amount 267,400   235,400
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]      
Derivative Asset, Notional Amount 221,591   182,177
Floating Rate Junior Subordinated Debentures [Member]      
Derivative, Amount of Hedged Item 18,000   18,000
Junior Subordinated Notes $ 61,900   $ 61,900