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Note 16 - Financial Derivatives (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2014
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Junior Subordinated Notes, Total $ 119,100      
Cash [Member]        
Collateral Already Posted, Aggregate Fair Value     $ 13,700 $ 7,100
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]        
Derivative Outstanding, Notional Amount $ 119,100      
Derivative Original Maturity (Year) 10 years      
Derivative, Notional Amount     119,136 119,136
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]        
Derivative Original Maturity (Year)   10 years    
Derivative, Notional Amount     527,477 $ 579,584
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Minimum [Member]        
Derivative Outstanding, Notional Amount     527,500  
Derivative Original Maturity (Year)   3 years    
Loans Receivable with Partial-term Hedging Designation [Member]        
Loans and Leases Receivable, Gross, Total     25,000  
Derivative, Notional Amount     45,000  
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount     25,000  
Hedged Asset, Fair Value Hedge, Last-of-Layer, Cumulative Increase (Decrease)     $ 427