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Note 15 - Regulatory Capital
 3 Months Ended
Mar. 31, 2016
Notes to Financial Statements  
Regulatory Capital Requirements under Banking Regulations [Text Block]
15.
   Regulatory Capital
 
Under current capital regulations, the Bank is required to comply with four separate capital adequacy standards. As of March 31, 2016, the Bank continues to be categorized as “well-capitalized” under the prompt corrective action regulations and continues to exceed all regulatory capital requirements. In 2016, a Capital Conservation Buffer (“CCB”) requirement became effective for banks. The CCB is designed to establish a capital range above minimum capital requirements and impose constraints on dividends, share buybacks and discretionary bonus payments when capital levels fall below prescribed levels. The minimum CCB in 2016 is 0.625% and increases 0.625% annually through 2019 to 2.5%. The CCB for the Bank at March 31, 2016 was 5.1%.
 
Set forth below is a summary of the Bank’s compliance with banking regulatory capital standards.
 
    March 31, 2016   December 31, 2015
    Amount   Percent of
Assets		   Amount   Percent of
Assets
    (Dollars in thousands)
                 
Tier I (leverage) capital:                                
Capital level   $ 498,308       8.65 %   $ 494,690       8.89 %
Requirement to be well capitalized     288,017       5.00       278,175       5.00  
Excess     210,291       3.65       216,515       3.89  
                                 
Common Equity Tier I risk-based capital:                                
Capital level   $ 498,308       12.51 %   $ 494,690       12.62  
Requirement to be well capitalized     258,947       6.50       254,768       6.50  
Excess     239,361       6.01       239,922       6.12  
                                 
Tier 1 risk-based capital:                                
Capital level   $ 498,308       12.51 %   $ 494,690       12.62 %
Requirement to be well capitalized     318,703       8.00       313,560       8.00  
Excess     179,605       4.51       181,130       4.62  
                                 
Total risk-based capital:                                
Capital level   $ 520,300       13.06 %   $ 516,226       13.17 %
Requirement to be well capitalized     398,379       10.00       391,950       10.00  
Excess     121,921       3.06       124,276       3.17  
 
The Holding Company is subject to the same regulatory capital requirements as the Bank. As of March 31, 2016, the Holding Company continues to be categorized as “well-capitalized” under the prompt corrective action regulations and continues to exceed all regulatory capital requirements. The CCB for the Holding Company at March 31, 2016 was 5.1%.
 
Set forth below is a summary of the Holding Company’s compliance with banking regulatory capital standards.
 
    March 31, 2016   December 31, 2015
    Amount   Percent of
Assets		   Amount   Percent of
Assets
    (Dollars in thousands)
                 
Tier I (leverage) capital:                                
Capital level   $ 497,698       8.65 %   $ 490,919       8.84 %
Requirement to be well capitalized     287,543       5.00       277,611       5.00  
Excess     210,155       3.65       213,308       3.84  
                                 
Common Equity Tier I risk-based capital:                                
Capital level   $ 470,685       11.84 %   $ 462,883       11.83  
Requirement to be well capitalized     258,443       6.50       254,335       6.50  
Excess     212,242       5.34       208,548       5.33  
                                 
Tier 1 risk-based capital:                                
Capital level   $ 497,698       12.52 %   $ 490,919       12.55 %
Requirement to be well capitalized     318,084       8.00       313,028       8.00  
Excess     179,614       4.52       177,891       4.55  
                                 
Total risk-based capital:                                
Capital level   $ 519,691       13.07 %   $ 512,454       13.10 %
Requirement to be well capitalized     397,605       10.00       391,285       10.00  
Excess     122,086       3.07       121,169       3.10