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Note 21 - Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
21.
Quarterly Financial Data
(unaudited)
 
Selected unaudited quarterly financial data for the fiscal years ended
December 31, 2018
and
2017
is presented below:
 
    2018     2017  
    4th     3rd     2nd     1st     4th     3rd     2nd     1st  
    (In thousands, except per share data)  
Quarterly operating data:                                                                
Interest income   $
67,433
     $
65,486
     $
63,293
     $
60,786
     $
59,697
     $
59,319
     $
58,315
     $
57,254
  
Interest expense    
26,797
      
23,965
      
20,653
      
18,177
      
16,637
      
16,278
      
14,698
      
13,865
  
Net interest income    
40,636
      
41,521
      
42,640
      
42,609
      
43,060
      
43,041
      
43,617
      
43,389
  
Provision for loan losses    
422
      
-
      
-
      
153
      
6,595
      
3,266
      
-
      
-
  
Other operating income (loss)    
(986
 )    
4,955
      
3,168
      
3,200
      
3,064
      
1,661
      
1,948
      
3,689
  
Other operating expense    
25,760
      
27,233
      
27,396
      
31,294
      
25,879
      
25,966
      
26,065
      
29,564
  
Income before income tax expense    
13,468
      
19,243
      
18,412
      
14,362
      
13,650
      
15,470
      
19,500
      
17,514
  
Income tax expense    
1,046
      
1,910
      
4,489
      
2,950
      
7,693
      
5,291
      
6,775
      
5,254
  
Net income   $
12,422
     $
17,333
     $
13,923
     $
11,412
     $
5,957
     $
10,179
     $
12,725
     $
12,260
  
                                                                 
                                                                 
Basic earnings per common share   $
0.44
     $
0.61
     $
0.48
     $
0.39
     $
0.21
     $
0.35
     $
0.44
     $
0.42
  
Diluted earnings per common share   $
0.44
     $
0.61
     $
0.48
     $
0.39
     $
0.21
     $
0.35
     $
0.44
     $
0.42
  
Dividends per common share   $
0.20
     $
0.20
     $
0.20
     $
0.20
     $
0.18
     $
0.18
     $
0.18
     $
0.18
  
                                                                 
Average common shares outstanding for:                                                                
Basic earnings per share    
28,422
      
28,604
      
28,845
      
28,974
      
29,045
      
29,120
      
29,135
      
29,019
  
Diluted earnings per share    
28,423
      
28,604
      
28,846
      
28,975
      
29,046
      
29,120
      
29,136
      
29,023