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Note 4 - Premises and Equipment, Net - Summary of Premises and Equipment (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Property, plant and equipment, gross $ 88,456,000 $ 94,169,000
Less: accumulated depreciation 33,068,000 35,210,000
Premises and equipment, net 55,388,000 58,959,000
Land and Land Improvements [Member]    
Property, plant and equipment, gross 14,258,000 16,533,000
Building [Member]    
Property, plant and equipment, gross 52,717,000 56,114,000
Furniture and Fixtures [Member]    
Property, plant and equipment, gross $ 21,481,000 $ 21,522,000