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Note 4 - Loans and Leases - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Evaluation Method (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Balance $ 25,534 $ 24,885    
Provision for loan and lease losses 600 735    
Charge-offs (99) (1,528)    
Recoveries 429 111    
Balance 26,464 24,203    
Loans individually evaluated for impairment     $ 3,312 $ 2,653
Loans collectively evaluated for impairment     2,522,397 2,545,518
Loans     2,525,709 2,548,171
Allowance for loans individually evaluated for impairment     39 42
Allowance for loans collectively evaluated for impairment     26,425 25,492
Allowance for loan losses 26,464 24,885 26,464 25,534
Financial Asset Acquired with Credit Deterioration [Member]        
Balance      
Balance      
Loans    
Allowance for loan losses  
Commercial and Industrial Portfolio Segment [Member]        
Balance 11,965 11,276    
Provision for loan and lease losses (302) 761    
Charge-offs (3) (1,409)    
Recoveries 102 10    
Balance 11,762 10,638    
Loans individually evaluated for impairment     218 220
Loans collectively evaluated for impairment     827,529 833,304
Loans     827,747 833,524
Allowance for loans individually evaluated for impairment     25 28
Allowance for loans collectively evaluated for impairment     11,737 11,937
Allowance for loan losses 11,965 11,276 11,762 11,965
Commercial and Industrial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Balance      
Balance      
Loans    
Allowance for loan losses  
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]        
Balance 1,760 1,724    
Provision for loan and lease losses (79) 296    
Charge-offs    
Recoveries 203    
Balance 1,884 2,020    
Loans individually evaluated for impairment     318
Loans collectively evaluated for impairment     216,115 224,732
Loans [1]     216,115 225,050
Allowance for loans individually evaluated for impairment    
Allowance for loans collectively evaluated for impairment     1,884 1,760
Allowance for loan losses 1,760 1,724 1,884 1,760
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Balance      
Balance      
Loans    
Allowance for loan losses  
Undevelopment Land Portfolio Segment [Member]        
Balance 752 521    
Provision for loan and lease losses (90) (39)    
Charge-offs    
Recoveries    
Balance 662 482    
Loans individually evaluated for impairment     474
Loans collectively evaluated for impairment     28,433 29,618
Loans     28,433 30,092
Allowance for loans individually evaluated for impairment    
Allowance for loans collectively evaluated for impairment     662 752
Allowance for loan losses 752 521 662 752
Undevelopment Land Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Balance      
Balance      
Loans    
Allowance for loan losses  
Real Estate Mortgage Portfolio Segment [Member]        
Balance 10,681 11,012    
Provision for loan and lease losses 1,300 (309)    
Charge-offs    
Recoveries 20 4    
Balance 12,001 10,707    
Loans individually evaluated for impairment     3,094 1,641
Loans collectively evaluated for impairment     1,405,057 1,409,806
Loans     1,408,151 1,411,447
Allowance for loans individually evaluated for impairment     14 14
Allowance for loans collectively evaluated for impairment     11,987 10,667
Allowance for loan losses 10,681 11,012 12,001 10,681
Real Estate Mortgage Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Balance      
Balance      
Loans    
Allowance for loan losses  
Consumer Portfolio Segment [Member]        
Balance 376 352    
Provision for loan and lease losses (229) 26    
Charge-offs (96) (119)    
Recoveries 104 97    
Balance 155 356    
Loans individually evaluated for impairment    
Loans collectively evaluated for impairment     45,263 48,058
Loans     45,263 48,058
Allowance for loans individually evaluated for impairment    
Allowance for loans collectively evaluated for impairment     155 376
Allowance for loan losses 376 $ 352 155 376
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Balance      
Balance      
Loans    
Allowance for loan losses  
[1] Consists of land acquired for development by the borrower, but for which no development has yet taken place.