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Note 7 - FDIC Indemnification Asset - Changes in Receivable From FDIC (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance $ 12,173 $ 20,844  
Decrease in estimated losses on covered loans (1)  
Increase in estimated losses on covered OREO 81 1,045  
Reimbursable expenses from the FDIC 112 162  
Net FDIC indemnification asset amortization (3,517) (5,474) $ (6,379)
Reimbursements from the FDIC (1,688) (4,403)  
Ending balance $ 7,161 $ 12,173 $ 20,844