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Note 6 - Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Beginning balance       $ 19,276 [1]       $ 17,948 $ 19,276 [1] $ 17,948  
Provision (Recovery) for loan losses                 2,393 2,771  
Charge-offs                 (4,907) (2,943)  
Recoveries                 1,505 1,500  
Net charge-offs                 (3,402) (1,443)  
Ending balance $ 18,267       $ 19,276 [1]       18,267 19,276 [1] $ 17,948
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations 908 $ 495 $ 495 495 615 $ 730 $ 934 492 2,393 2,771 1,255
Recovery of loan losses recorded through the FDIC indemnification asset                    
Financial Asset Acquired with Credit Deterioration [Member]                      
Beginning balance       0       12 0 12  
Provision (Recovery) for loan losses                   (12)  
Ending balance 0       0       0 0 12
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                   (12)  
Recovery of loan losses recorded through the FDIC indemnification asset                    
Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Beginning balance       19,276       17,936 19,276 17,936  
Provision (Recovery) for loan losses                   2,783  
Charge-offs                   (2,943)  
Recoveries                   1,500  
Net charge-offs                   (1,443)  
Ending balance         19,276         19,276 17,936
Commercial Portfolio Segment [Member]                      
Beginning balance       11,672       11,690 11,672 11,690  
Provision (Recovery) for loan losses                 (660) 103  
Charge-offs                 (1,236) (922)  
Recoveries                 723 801  
Net charge-offs                 (513) (121)  
Ending balance 10,499       11,672       10,499 11,672 11,690
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                   103  
Recovery of loan losses recorded through the FDIC indemnification asset                    
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]                      
Beginning balance              
Provision (Recovery) for loan losses                    
Ending balance                
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                    
Recovery of loan losses recorded through the FDIC indemnification asset                    
Commercial Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Beginning balance       11,672       11,690 11,672 11,690  
Provision (Recovery) for loan losses                   103  
Charge-offs                   (922)  
Recoveries                   801  
Net charge-offs                   (121)  
Ending balance         11,672         11,672 11,690
Consumer Real Estate Portfolio Segment [Member]                      
Beginning balance       6,810       5,499 6,810 5,499  
Provision (Recovery) for loan losses                 1,473 1,596  
Charge-offs                 (2,005) (699)  
Recoveries                 454 414  
Net charge-offs                 (1,551) (285)  
Ending balance 6,732       6,810       6,732 6,810 5,499
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                   1,596  
Recovery of loan losses recorded through the FDIC indemnification asset                    
Consumer Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]                      
Beginning balance             12 12  
Provision (Recovery) for loan losses                   (12)  
Ending balance                 12
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                   (12)  
Recovery of loan losses recorded through the FDIC indemnification asset                    
Consumer Real Estate Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Beginning balance       6,810       5,487 6,810 5,487  
Provision (Recovery) for loan losses                   1,608  
Charge-offs                   (699)  
Recoveries                   414  
Net charge-offs                   (285)  
Ending balance         6,810         6,810 5,487
Consumer and Other Portfolio Segment [Member]                      
Beginning balance       794       759 794 759  
Provision (Recovery) for loan losses                 1,580 1,072  
Charge-offs                 (1,666) (1,322)  
Recoveries                 328 285  
Net charge-offs                 (1,338) (1,037)  
Ending balance $ 1,036       794       1,036 794 759
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                   1,072  
Recovery of loan losses recorded through the FDIC indemnification asset                    
Consumer and Other Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]                      
Beginning balance              
Provision (Recovery) for loan losses                    
Ending balance                
Benefit attributable to the FDIC indemnification asset                    
Provision (Recovery) for loan losses charged to operations                    
Recovery of loan losses recorded through the FDIC indemnification asset                    
Consumer and Other Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Beginning balance       $ 794       $ 759 $ 794 759  
Provision (Recovery) for loan losses                   1,072  
Charge-offs                   (1,322)  
Recoveries                   285  
Net charge-offs                   (1,037)  
Ending balance         $ 794         $ 794 $ 759
[1] Derived from audited financial statements