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Note 3 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment and Based On Impairment Evaluation Method - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   $ 1,954,425   $ 1,868,550
Loans collectively evaluated for impairment   1,942,877   1,855,837
Loans individually evaluated for impairment   10,653   11,551
Allowance for loan losses        
Allowance for loan losses   24,920 $ 28,522 28,522
Allowance for loan losses   21,614   24,920
Allowance for loans collectively evaluated for impairment   20,011   23,544
Allowance for loans individually evaluated for impairment   1,603   1,376
Provision (credit) $ (2,100) 0 (400) (400)
Charge-offs   (4,481)   (4,244)
Recoveries   1,175   1,042
Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   895   1,162
Allowance for loan losses        
  0   0
Commercial and Industrial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   610,877   571,754
Loans collectively evaluated for impairment   604,021   564,443
Loans individually evaluated for impairment   6,778   7,239
Allowance for loan losses        
Allowance for loan losses   11,819 7,644 7,644
Allowance for loan losses   8,306   11,819
Allowance for loans collectively evaluated for impairment   7,089   10,790
Allowance for loans individually evaluated for impairment   1,217   1,029
Provision (credit)   (214)   4,593
Charge-offs   (3,346)   (661)
Recoveries   47   243
Commercial and Industrial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   78   72
Allowance for loan losses        
  0   0
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   109,870   95,733
Loans collectively evaluated for impairment   109,523   94,603
Loans individually evaluated for impairment   26   516
Allowance for loan losses        
Allowance for loan losses   721 2,555 2,555
Allowance for loan losses   1,320   721
Allowance for loans collectively evaluated for impairment   1,320   706
Allowance for loans individually evaluated for impairment   0   15
Provision (credit)   599   (1,584)
Charge-offs   0   (250)
Recoveries   0   0
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   321   614
Allowance for loan losses        
  0   0
Undevelopment Land Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   18,950   21,268
Loans collectively evaluated for impairment   18,950   21,268
Loans individually evaluated for impairment   0   0
Allowance for loan losses        
Allowance for loan losses   1,545 5,376 5,376
Allowance for loan losses   868   1,545
Allowance for loans collectively evaluated for impairment   868   1,545
Allowance for loans individually evaluated for impairment   0   0
Provision (credit)   (1,327)   (2,244)
Charge-offs   0   (1,753)
Recoveries   650   166
Undevelopment Land Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   0   0
Allowance for loan losses        
  0   0
Real Estate Mortgage Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   1,183,602   1,150,399
Loans collectively evaluated for impairment   1,179,342   1,146,212
Loans individually evaluated for impairment   3,764   3,720
Allowance for loan losses        
Allowance for loan losses   10,541 12,604 12,604
Allowance for loan losses   10,815   10,541
Allowance for loans collectively evaluated for impairment   10,499   10,285
Allowance for loans individually evaluated for impairment   316   256
Provision (credit)   844   (1,190)
Charge-offs   (688)   (993)
Recoveries   118   120
Real Estate Mortgage Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   496   467
Allowance for loan losses        
  0   0
Consumer Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   31,126   29,396
Loans collectively evaluated for impairment   31,041   29,311
Loans individually evaluated for impairment   85   76
Allowance for loan losses        
Allowance for loan losses   294 343 343
Allowance for loan losses   305   294
Allowance for loans collectively evaluated for impairment   235   218
Allowance for loans individually evaluated for impairment   70   76
Provision (credit)   98   25
Charge-offs   (447)   (587)
Recoveries   360   513
Consumer Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans   0   9
Allowance for loan losses        
  0   0
Unallocated Financing Receivables [Member]        
Allowance for loan losses        
Allowance for loan losses   0 $ 0 0
Allowance for loan losses   0   0
Allowance for loans collectively evaluated for impairment   0   0
Allowance for loans individually evaluated for impairment   0   0
Provision (credit)   0   0
Charge-offs   0   0
Recoveries   0   0
Unallocated Financing Receivables [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Allowance for loan losses        
  $ 0   $ 0