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Note 5 - Credit Quality (Details Textual)
$ in Thousands
 12 Months Ended 22 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Covered, before Allowance for Credit Loss, Total     $ 9,680
Financing Receivable, Collectively Evaluated for Impairment     2,138,921
Loans Deemed to be Impaired, Threshold     500
Financing Receivable, Nonaccrual, Interest Income $ 72    
Financing Receivable, Nonaccrual $ 20,768 $ 20,768 22,003
Performing Status Returned Period (Month) 6 months    
Financing Receivable, Number of Loans Modified During Period   4,066  
Financing Receivable, Loans Modified During Period   $ 475,820  
Financing Receivable, Deferred Payments $ 2,920 $ 2,920  
Impaired Loans [Member]      
Financing Receivable, Collectively Evaluated for Impairment     31,180
Covered Loans [Member]      
Financing Receivable, Nonaccrual     297
Non-covered Loans [Member]      
Financing Receivable, 90 Days or More Past Due, Still Accruing     $ 295