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Note 3 - Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Investment Securities Available-for-sale and Held-to-Maturity [Table Text Block]
   
Available-for-Sale
  
   
March 31
, 201
7
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
97,003
     $
434
     $
(938
)
   $
96,499
  
Commercial
    
77,606
      
51
      
(1,156
)
    
76,501
  
Obligations of states and political subdivisions
    
7,637
      
395
      
(8
)
    
8,024
  
Obligations of U.S. government-sponsored agencies
    
2,000
      
4
      
—
 
    
2,004
  
Corporate notes
    
750
      
—
      
—
      
750
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
   $
185,076
     $
884
     $
(2,102
)
   $
183,858
  
   
Held-to-Maturity
  
   
March 31, 2017
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
  
$
17,880
    
$
7
    
$
(132
)
  
$
17,755
  
Obligations of U.S. government-sponsored agencies
    
9,715
      
12
      
(152
)
    
9,575
  
Obligations of states and political subdivisions
    
2,044
      
6
      
(22
)
    
2,028
  
Total
  
$
29,639
    
$
25
    
$
(306
)
  
$
29,358
  
   
Available-for-Sale
  
   
December 31, 2016
  
   
 
 
 
  
Gross
    
Gross
    
Estimated
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
  
$
99,922
    
$
490
    
$
(2,003
)
  
$
98,409
  
Commercial
    
71,761
      
56
      
(1,287
)
    
70,530
  
Obligations of states and political subdivisions
    
9,759
      
390
      
(7
)
    
10,142
  
Obligations of U.S. government-sponsored agencies
    
2,000
      
—
      
(7
)
    
1,993
  
Corporate notes
    
756
      
—
      
—
      
756
  
U.S. Treasury securities
    
80
      
—
      
—
      
80
  
Total
  
$
184,278
    
$
936
    
$
(3,304
)
  
$
181,910
  
   
Held-to-Maturity
  
   
December 31, 2016
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
14,684
     $
5
     $
(148
)
   $
14,541
  
Obligations of U.S. government-sponsored agencies
    
9,129
      
13
      
(222
)
    
8,920
  
Obligations of states and political subdivisions
    
2,091
      
2
      
(46
)
    
2,047
  
Total
   $
25,904
     $
20
     $
(416
)
   $
25,508
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Available-for-Sale
    
Held-to-Maturity
  
   
Amortized
Cost
    
Estimated
Fair
Value
    
Amortized
Cost
    
Estimated
Fair
Value
  
   
(Dollars in Thousands)
  
Maturing within one year
   $
1,089
     $
1,093
     $
—
     $
—
  
Maturing after one to five years
    
6,172
      
6,245
      
2,289
      
2,303
  
Maturing after five to ten years
    
82,184
      
81,875
      
2,913
      
2,876
  
Maturing after ten years
    
95,631
      
94,645
      
24,437
      
24,179
  
Total
   $
185,076
     $
183,858
     $
29,639
     $
29,358
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
Available-for-Sale
  
   
March 31
, 201
7
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
75,284
     $
(917
)
   $
1,729
     $
(21
)
Commercial
    
48,106
      
(807
)
    
18,066
      
(349
)
Obligations of states and political subdivisions    
847
      
(8
 )    
—
      
—
  
U.S. Treasury securities
    
80
      
—
 
    
—
      
—
  
Total
   $
124,317
     $
(1,732
)
   $
19,795
     $
(370
)
   
Held-to-Maturity
  
   
March 31
, 2017
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
13,030
     $
(132
)
   $
—
     $
—
  
Obligations of U.S. government-sponsored agencies
    
8,618
      
(152
)
    
—
      
—
 
Obligations of states and political subdivisions
    
1,056
      
(15
)
    
549
      
(7
 )
Total
   $
22,704
     $
(299
)
   $
549
     $
(7
)
   
Available-for-Sale
  
   
December 31, 201
6
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Residential
   $
85,741
     $
(1,976
)
   $
1,904
     $
(27
)
Commercial
    
54,475
      
(946
)
    
10,721
      
(341
)
Obligations of U.S. government-sponsored agencies
    
1,993
      
(7
)
    
—
      
—
  
Obligations of states and political subdivisions
    
434
      
(7
 )    
—
      
—
  
U.S. Treasury securities
    
80
      
—
 
    
—
      
—
  
Total
   $
142,723
     $
(2,936
)
   $
12,625
     $
(368
)
   
Held-to-Maturity
  
   
December 31, 2016
  
   
Less than 12 Months
    
12 Months or More
  
   
Fair
Value
    
Unrealized
Losses
    
Fair
Value
    
Unrealized
Losses
  
   
(Dollars in Thousands)
  
Mortgage-backed securities:
                                
Commercial
   $
12,776
     $
(148
)
   $
—
     $
—
  
Obligations of U.S. government-sponsored agencies
    
7,957
      
(222
)
    
—
      
—
 
Obligations of states and political subdivisions
    
1,628
      
(46
)
    
—
      
—
  
Total
   $
22,361
     $
(416
)
   $
—
     $
—