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Note 15 - Regulatory Capital (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
    September 30, 2016   December 31, 2015
    Amount   Percent of
Assets		   Amount   Percent of
Assets
    (Dollars in thousands)
                 
Tier I (leverage) capital:                                
Capital level   $ 528,168       8.88 %   $ 494,690       8.89 %
Requirement to be well capitalized     297,261       5.00       278,175       5.00  
Excess     230,907       3.88       216,515       3.89  
                                 
Common Equity Tier I risk-based capital:                                
Capital level   $ 528,168       12.44 %   $ 494,690       12.62  
Requirement to be well capitalized     275,911       6.50       254,768       6.50  
Excess     252,257       5.94       239,922       6.12  
                                 
Tier 1 risk-based capital:                                
Capital level   $ 528,168       12.44 %   $ 494,690       12.62 %
Requirement to be well capitalized     339,583       8.00       313,560       8.00  
Excess     188,585       4.44       181,130       4.62  
                                 
Total risk-based capital:                                
Capital level   $ 549,963       12.96 %   $ 516,226       13.17 %
Requirement to be well capitalized     424,479       10.00       391,950       10.00  
Excess     125,484       2.96       124,276       3.17  
    September 30, 2016   December 31, 2015
    Amount   Percent of
Assets		   Amount   Percent of
Assets
    (Dollars in thousands)
                 
Tier I (leverage) capital:                                
Capital level   $ 523,428       8.80 %   $ 490,919       8.84 %
Requirement to be well capitalized     297,458       5.00       277,611       5.00  
Excess     225,970       3.80       213,308       3.84  
                                 
Common Equity Tier I risk-based capital:                                
Capital level   $ 496,605       11.72 %   $ 462,883       11.83  
Requirement to be well capitalized     275,404       6.50       254,335       6.50  
Excess     221,201       5.22       208,548       5.33  
                                 
Tier 1 risk-based capital:                                
Capital level   $ 523,428       12.35 %   $ 490,919       12.55 %
Requirement to be well capitalized     338,958       8.00       313,028       8.00  
Excess     184,470       4.35       177,891       4.55  
                                 
Total risk-based capital:                                
Capital level   $ 545,223       12.87 %   $ 512,454       13.10 %
Requirement to be well capitalized     423,698       10.00       391,285       10.00  
Excess     121,525       2.87       121,169       3.10