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Note 21 - Regulatory Requirements and Restrictions (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
   
December 31, 2017
  
 
 
Actual
    
Minimum Basel III
Requirement
    
Minimum Basel III
Requirement - Fully
Phased-In
    
Well Capitalized
Requirement
(1)
  
(Amounts in thousands)
  
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
  
The Company
                                                                
Common equity Tier 1 ratio
   $
251,052
      
13.98
 %   $
80,816
      
4.50
 %   $
125,713
      
7.00
 %  
N/A
    
N/A
  
Tier 1 risk-based capital ratio
    
251,052
      
13.98
 %    
107,754
      
6.00
 %    
152,652
      
8.50
 %  
N/A
    
N/A
  
Total risk-based capital ratio
    
270,394
      
15.06
 %    
143,672
      
8.00
 %    
188,570
      
10.50
 %  
N/A
    
N/A
  
Tier 1 Leverage ratio
    
251,052
      
11.06
 %    
90,822
      
4.00
 %    
90,822
      
4.00
 %  
N/A
    
N/A
  
                                                                 
The Bank
                                                                
Common equity Tier 1 ratio
   $
222,856
      
12.47
 %   $
80,447
      
4.50
 %   $
125,139
      
7.00
 %   $
116,201
      
6.50
 %
Tier 1 risk-based capital ratio
    
222,856
      
12.47
 %    
107,262
      
6.00
 %    
151,955
      
8.50
 %    
178,771
      
8.00
 %
Total risk-based capital ratio
    
242,218
      
13.55
 %    
143,016
      
8.00
 %    
187,709
      
10.50
 %    
143,016
      
10.00
 %
Tier 1 Leverage ratio
    
222,856
      
9.84
 %    
90,604
      
4.00
 %    
90,604
      
4.00
 %    
113,255
      
5.00
 %
   
December 31, 2016
  
 
  
Actual
    
Minimum Basel III
Requirement
    
Minimum Basel III
Requirement - Fully
Phased-In
    
Well Capitalized
Requirement
(1)
  
(Amounts in thousands)
  
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
  
The Company
                                                                
Common equity Tier 1 ratio
   $
241,671
      
13.88
 %   $
78,362
      
4.50
 %   $
121,897
      
7.00
 %  
N/A
    
N/A
  
Tier 1 risk-based capital ratio
    
256,671
      
14.74
 %    
104,483
      
6.00
 %    
148,018
      
8.50
 %  
N/A
    
N/A
  
Total risk-based capital ratio
    
274,953
      
15.79
 %    
139,311
      
8.00
 %    
182,846
      
10.50
 %  
N/A
    
N/A
  
Tier 1 Leverage ratio
    
256,671
      
11.07
 %    
92,742
      
4.00
 %    
92,742
      
4.00
 %  
N/A
    
N/A
  
                                                                 
The Bank
                                                                
Common equity Tier 1 ratio
   $
223,944
      
12.93
 %   $
77,956
      
4.50
 %   $
121,264
      
7.00
 %   $
112,603
      
6.50
 %
Tier 1 risk-based capital ratio
    
223,944
      
12.93
 %    
103,941
      
6.00
 %    
147,249
      
8.50
 %    
138,588
      
8.00
 %
Total risk-based capital ratio
    
242,218
      
13.98
 %    
138,588
      
8.00
 %    
181,897
      
10.50
 %    
173,235
      
10.00
 %
Tier 1 Leverage ratio
    
223,944
      
9.71
 %    
92,274
      
4.00
 %    
92,274
      
4.00
 %    
115,343
      
5.00
 %