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Note 5 - Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Total allowance    
Beginning balance $ 19,276 [1] $ 17,948
Provision (Recovery) for loan losses 495 492
Charge-offs (698) (357)
Recoveries 427 375
Net recoveries (charge-offs) (271) 18
Ending balance 19,500 18,458
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations 495 492
Recovery of loan losses recorded through the FDIC indemnification asset  
Allowance, excluding PCI    
Beginning balance 19,276 [1] 17,948
Provision (Recovery) for loan losses 495 492
Charge-offs (698) (357)
Recoveries 427 375
Net recoveries (charge-offs) (271) 18
Ending balance 19,500 18,458
PCI allowance    
Beginning balance 19,276 [1] 17,948
Provision (Recovery) for loan losses 495 492
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations 495 492
Recovery of loan losses recorded through the FDIC indemnification asset  
Ending balance 19,500 18,458
Financial Asset Acquired with Credit Deterioration [Member]    
Total allowance    
Beginning balance   12
Provision (Recovery) for loan losses  
Ending balance 0 12
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  
Allowance, excluding PCI    
Beginning balance   12
Provision (Recovery) for loan losses  
Ending balance 0 12
PCI allowance    
Beginning balance   12
Provision (Recovery) for loan losses  
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  
Ending balance 0 12
Allowance Excluding Purchased Credit Impaired Loans [Member]    
Total allowance    
Beginning balance   17,936
Provision (Recovery) for loan losses   492
Charge-offs   (357)
Recoveries   375
Net recoveries (charge-offs)   18
Ending balance   18,446
Allowance, excluding PCI    
Beginning balance   17,936
Provision (Recovery) for loan losses   492
Charge-offs   (357)
Recoveries   375
Net recoveries (charge-offs)   18
Ending balance   18,446
PCI allowance    
Beginning balance   17,936
Provision (Recovery) for loan losses   492
Ending balance   18,446
Commercial Portfolio Segment [Member]    
Total allowance    
Beginning balance 11,672 11,690
Provision (Recovery) for loan losses (41) 85
Charge-offs (141) (29)
Recoveries 288 226
Net recoveries (charge-offs) 147 197
Ending balance 11,778 11,972
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations   85
Recovery of loan losses recorded through the FDIC indemnification asset  
Allowance, excluding PCI    
Beginning balance 11,672 11,690
Provision (Recovery) for loan losses (41) 85
Charge-offs (141) (29)
Recoveries 288 226
Net recoveries (charge-offs) 147 197
Ending balance 11,778 11,972
PCI allowance    
Beginning balance 11,672 11,690
Provision (Recovery) for loan losses (41) 85
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations   85
Recovery of loan losses recorded through the FDIC indemnification asset  
Ending balance 11,778 11,972
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Total allowance    
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  
Allowance, excluding PCI    
Beginning balance  
Provision (Recovery) for loan losses  
Ending balance  
PCI allowance    
Beginning balance  
Provision (Recovery) for loan losses  
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  
Ending balance  
Commercial Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]    
Total allowance    
Beginning balance   11,690
Provision (Recovery) for loan losses   85
Charge-offs   (29)
Recoveries   226
Net recoveries (charge-offs)   197
Ending balance   11,972
Allowance, excluding PCI    
Beginning balance   11,690
Provision (Recovery) for loan losses   85
Charge-offs   (29)
Recoveries   226
Net recoveries (charge-offs)   197
Ending balance   11,972
PCI allowance    
Beginning balance   11,690
Provision (Recovery) for loan losses   85
Ending balance   11,972
Consumer Real Estate Portfolio Segment [Member]    
Total allowance    
Beginning balance 6,810 5,499
Provision (Recovery) for loan losses 237 246
Charge-offs (131) (77)
Recoveries 47 78
Net recoveries (charge-offs) (84) 1
Ending balance 6,963 5,746
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations   246
Recovery of loan losses recorded through the FDIC indemnification asset  
Allowance, excluding PCI    
Beginning balance 6,810 5,499
Provision (Recovery) for loan losses 237 246
Charge-offs (131) (77)
Recoveries 47 78
Net recoveries (charge-offs) (84) 1
Ending balance 6,963 5,746
PCI allowance    
Beginning balance 6,810 5,499
Provision (Recovery) for loan losses 237 246
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations   246
Recovery of loan losses recorded through the FDIC indemnification asset  
Ending balance 6,963 5,746
Consumer Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Total allowance    
Beginning balance   12
Provision (Recovery) for loan losses  
Ending balance   12
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  
Allowance, excluding PCI    
Beginning balance   12
Provision (Recovery) for loan losses  
Ending balance   12
PCI allowance    
Beginning balance   12
Provision (Recovery) for loan losses  
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  
Ending balance   12
Consumer Real Estate Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]    
Total allowance    
Beginning balance   5,487
Provision (Recovery) for loan losses   246
Charge-offs   (77)
Recoveries   78
Net recoveries (charge-offs)   1
Ending balance   5,734
Allowance, excluding PCI    
Beginning balance   5,487
Provision (Recovery) for loan losses   246
Charge-offs   (77)
Recoveries   78
Net recoveries (charge-offs)   1
Ending balance   5,734
PCI allowance    
Beginning balance   5,487
Provision (Recovery) for loan losses   246
Ending balance   5,734
Consumer and Other Portfolio Segment [Member]    
Total allowance    
Beginning balance 794 759
Provision (Recovery) for loan losses 299 161
Charge-offs (426) (251)
Recoveries 92 71
Net recoveries (charge-offs) (334) (180)
Ending balance 759 740
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations   161
Recovery of loan losses recorded through the FDIC indemnification asset  
Allowance, excluding PCI    
Beginning balance 794 759
Provision (Recovery) for loan losses 299 161
Charge-offs (426) (251)
Recoveries 92 71
Net recoveries (charge-offs) (334) (180)
Ending balance 759 740
PCI allowance    
Beginning balance 794 759
Provision (Recovery) for loan losses 299 161
Benefit attributable to the FDIC indemnification asset  
Provision (Recovery) for loan losses charged to operations   161
Recovery of loan losses recorded through the FDIC indemnification asset  
Ending balance $ 759 740
Consumer and Other Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Total allowance    
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  
Allowance, excluding PCI    
Beginning balance  
Provision (Recovery) for loan losses  
Ending balance  
PCI allowance    
Beginning balance  
Provision (Recovery) for loan losses  
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  
Ending balance  
Consumer and Other Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]    
Total allowance    
Beginning balance   759
Provision (Recovery) for loan losses   161
Charge-offs   (251)
Recoveries   71
Net recoveries (charge-offs)   (180)
Ending balance   740
Allowance, excluding PCI    
Beginning balance   759
Provision (Recovery) for loan losses   161
Charge-offs   (251)
Recoveries   71
Net recoveries (charge-offs)   (180)
Ending balance   740
PCI allowance    
Beginning balance   759
Provision (Recovery) for loan losses   161
Ending balance   $ 740
[1] Derived from audited financial statements