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Note 8 - Loans - Aging of Troubled Debt Restructurings (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loans current and past due less than 30 days $ 1,166,748 $ 810,195
Nonaccrual loans 9,218 13,113
Financing Receivables 30 to 89 Days Past Due [Member]    
Loans past due 10,023 8,308
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans past due 5,451 9,060
Troubled Debt Restructuring [Member]    
Loans current and past due less than 30 days 889 612
Nonaccrual loans 1,737 2,884
Troubled debt restructurings 2,626 3,539
Troubled Debt Restructuring [Member] | Financing Receivables 30 to 89 Days Past Due [Member]    
Loans past due 0 43
Troubled Debt Restructuring [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans past due $ 0 $ 0