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Note 6 - Goodwill and Intangibles - Estimated Amortization Expense of Core Deposit Intangible (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net book value $ 11,381 $ 14,970 $ 17,450  
Core Deposits [Member]        
2021 2,032      
2022 1,971      
2023 1,776      
2024 1,623      
2025 1,535      
Thereafter 2,444      
Net book value $ 11,381 13,466 15,595 $ 9,079
Customer Lists [Member]        
Net book value   $ 1,504 $ 1,855