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Note 4 - Credit Quality (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended 16 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Covered, before Allowance for Credit Loss, Total $ 7,503 $ 7,503   $ 7,503 $ 9,680 [1]
Financing Receivable, Collectively Evaluated for Impairment         2,138,921
Loans Deemed to be Impaired, Threshold         500
Financing Receivable, Nonaccrual 24,085 24,085   $ 24,085 22,003
Financing Receivable, Nonaccrual, Interest Income 15 24      
Performing Status Returned Period (Month)       6 months  
Financing Receivable, Number of Loans Modified During Period       3,861  
Financing Receivable, Loans Modified During Period       $ 469,210  
Financing Receivable, Deferred Payments 4,020 4,020 $ 436,110 4,020 32,260
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   0 $ 209    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts     1    
Impaired Loans [Member]          
Financing Receivable, Collectively Evaluated for Impairment         31,180
Covered Loans [Member]          
Financing Receivable, Nonaccrual $ 230 $ 230   $ 230 297
Non-covered Loans [Member]          
Financing Receivable, 90 Days or More Past Due, Still Accruing         $ 295
[1] Derived from audited financial statements