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Note 20 - Impact of COVID-19 (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, after Allowance for Credit Loss, Total $ 1,232,389 $ 1,107,180
Debt Securities, Available-for-sale, Amortized Cost, Total 3,900,751 3,041,860
Debt Securities, Available-for-sale, Total $ 4,063,185 $ 3,078,846
Corporate Debt Securities [Member] | Industrial and Energy Sectors [Member]    
Debt Securities, Available-for-Sale, Number of Issuers 14  
Debt Securities, Available-for-sale, Amortized Cost, Total $ 275,100  
Debt Securities, Available-for-sale, Total 291,900  
Commercial Portfolio Segment [Member]    
Financing Receivable, Loan Deferrals 33  
Consumer Portfolio Segment [Member]    
Financing Receivable, Loan Deferrals 2,500  
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Loan Deferrals 7,800  
Paycheck Protection Program Loans [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, after Allowance for Credit Loss, Total 187,000  
United States Small Business Administration [Member] | Paycheck Protection Program Loans [Member]    
Financing Receivable Loans Originated Amount $ 249,000