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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Jan. 01, 2021
Sep. 30, 2020
Dec. 31, 2019
Loans and Leases Receivable, before Fees, Gross   $ 2,760,572 $ 2,201,597
Percentage of Gross Loans with LIBOR Based Reference Rate   15.00%  
Forecast [Member] | Minimum [Member]      
Operating Lease, Right-of-Use Asset $ 25,000    
Operating Lease, Liability, Total 25,000    
Forecast [Member] | Maximum [Member]      
Operating Lease, Right-of-Use Asset 30,000    
Operating Lease, Liability, Total $ 30,000