Note 4 - Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Investment [Table Text Block]
Amortized Cost and Fair Value of Investment Portfolio
 
                                 
 
 
 
 
 
 
Gross
 
 
Gross
 
 
 
 
 
 
 
Amortized
 
 
Unrealized
 
 
Unrealized
 
 
Fair
 
 
 
Cost
 
 
Gains
 
 
Losses
 
 
Value
 
2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities available-for-sale:
                               
U.S. Government agencies
  $
-
    $
-
    $
-
    $
-
 
Municipal securities
   
12,731
     
588
     
-
     
13,319
 
Residential agency pass-through securities
   
194,175
     
945
     
(2,355
 )    
192,765
 
Residential collateralized mortgage obligations
   
93,980
     
615
     
(185
 )    
94,410
 
Commercial mortgage-backed obligations
   
15,912
     
-
     
(415
 )    
15,497
 
Asset-backed securities
   
84,955
     
211
     
(1,215
 )    
83,951
 
Corporate and other securities
   
1,479
     
-
     
(159
 )    
1,320
 
Equity securities
   
1,250
     
-
     
(11
 )    
1,239
 
Total securities available-for-sale
  $
404,482
    $
2,359
    $
(4,340
 )   $
402,501
 
                                 
Securities held-to-maturity:
                               
Residential agency pass-through securities
  $
34,063
    $
537
    $
(47
 )   $
34,553
 
Residential collateralized mortgage obligations
   
6,730
     
87
     
-
     
6,817
 
Commercial mortgage-backed obligations
   
46,851
     
526
     
-
     
47,377
 
Asset-backed securities
   
4,108
     
-
     
(27
 )    
4,081
 
Total securities held-to-maturity
  $
91,752
    $
1,150
    $
(74
 )   $
92,828
 
                                 
2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities available-for-sale:
                               
U.S. Government agencies
  $
503
    $
11
    $
-
    $
514
 
Municipal securities
   
14,049
     
747
     
-
     
14,796
 
Residential agency pass-through securities
   
130,041
     
1,500
     
(81
 )    
131,460
 
Residential collateralized mortgage obligations
   
151,928
     
646
     
(943
 )    
151,631
 
Commercial mortgage-backed obligations
   
4,856
     
-
     
(100
 )    
4,756
 
Asset-backed securities
   
79,941
     
104
     
(925
 )    
79,120
 
Corporate and other securities
   
1,463
     
37
     
-
     
1,500
 
Equity securities
   
1,250
     
-
     
(93
 )    
1,157
 
Total securities available-for-sale
  $
384,031
    $
3,045
    $
(2,142
 )   $
384,934
 
                                 
Securities held-to-maturity:
                               
Residential agency pass-through securities
  $
41,012
    $
831
    $
(53
 )   $
41,790
 
Residential collateralized mortgage obligations
   
7,723
     
69
     
-
     
7,792
 
Commercial mortgage-backed obligations
   
54,028
     
-
     
(1,367
 )    
52,661
 
Asset-backed securities
   
5,394
     
-
     
(8
 )    
5,386
 
Total securities held-to-maturity
  $
108,157
    $
900
    $
(1,428
 )   $
107,629
 
Investments Classified by Contractual Maturity Date [Table Text Block]
Maturities of Investment Portfolio
 
                 
 
 
December 31, 2016
 
 
 
Amortized
 
 
Fair
 
 
 
Cost
 
 
Value
 
Securities available-for-sale:
               
U.S. Government agencies
                
Due under one year
   $
-
    $
-
 
Municipal securities
                
Due after five years through ten years
    
5,823
     
6,023
 
Due after ten years
    
6,908
     
7,296
 
Residential agency pass-through securities
                
Due after five years through ten years
    
17,320
     
17,789
 
Due after ten years
    
176,855
     
174,976
 
Residential collateralized mortgage obligations
                
Due after five years through ten years
    
14,723
     
14,742
 
Due after ten years
    
79,257
     
79,668
 
Commercial mortgage-backed obligations
                
Due after one year through five years
    
7,476
     
7,297
 
Due after ten years
    
8,436
     
8,200
 
Asset-backed securities
                
Due after five years through ten years
    
23,304
     
22,755
 
Due after ten years
    
61,651
     
61,196
 
Corporate and other securities
                
Due after ten years
    
1,479
     
1,320
 
Equity securities
                
Due after ten years
    
1,250
     
1,239
 
Total securities available-for-sale
   $
404,482
    $
402,501
 
                 
Securities held-to-maturity:
               
Residential agency pass-through securities
                
Due after ten years
   $
34,063
    $
34,553
 
Residential collateralized mortgage obligations
                
Due after ten years
    
6,730
     
6,817
 
Commercial mortgage-backed obligations
                
Due after five years through ten years
    
46,851
     
47,377
 
Asset-backed securities
                
Due after ten years
    
4,108
     
4,081
 
Total securities held-to-maturity
   $
91,752
    $
92,828
 
Realized Gain (Loss) on Investments [Table Text Block]
 
 
December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Proceeds from sales
   $
65,695
    $
3,095
    $
161,434
 
Gross realized gains
    
94
     
54
     
427
 
Gross realized losses
    
(181
 )    
-
     
(247
 )
Schedule of Unrealized Loss on Investments [Table Text Block]
Investment Portfolio Gross Unrealized Losses and Fair Value
 
                                                 
 
 
Less Than 12 Months
 
 
12 Months or More
 
 
Total
 
 
 
Fair
 
 
Unrealized
 
 
Fair
 
 
Unrealized
 
 
Fair
 
 
Unrealized
 
 
 
Value
 
 
Losses
 
 
Value
 
 
Losses
 
 
Value
 
 
Losses
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities available-for-sale:
                                                
Residential agency mortgage-backed securities
  $
-
    $
-
    $
138,759
    $
(2,355
 )   $
138,759
    $
(2,355
 )
Residential collateralized mortgage obligations
   
-
     
-
     
30,650
     
(185
 )    
30,650
     
(185
 )
Commercial mortgage-backed obligations
   
-
     
-
     
15,497
     
(415
 )    
15,497
     
(415
 )
Asset-backed securities
   
23,539
     
(385
 )    
37,580
     
(830
 )    
61,119
     
(1,215
 )
Equity securities
   
-
     
-
     
1,320
     
(170
 )    
1,320
     
(170
 )
                                                 
Total temporarily impaired
available-for-sale securities
  $
23,539
    $
(385
 )   $
223,806
    $
(3,955
 )   $
247,345
    $
(4,340
 )
                                                 
                                                 
Securities held-to-maturity:
                                                
Residential collateralized mortgage obligations
  $
-
    $
-
    $
3,830
    $
(47
 )   $
3,830
    $
(47
 )
Commercial mortgage-backed obligations
   
-
     
-
     
-
     
-
     
-
     
-
 
Asset-backed securities
   
4,081
     
(27
 )    
-
     
-
     
4,081
     
(27
 )
                                                 
Total temporarily impaired
held-to-maturity securities
  $
4,081
    $
(27
 )   $
3,830
    $
(47
 )   $
7,911
    $
(74
 )
                                                 
December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Securities available-for-sale:
                                                
Residential agency mortgage-backed securities
  $
14,785
    $
(37
 )   $
3,489
    $
(44
 )   $
18,274
    $
(81
 )
Residential collateralized mortgage obligations
   
43,563
     
(306
 )    
27,718
     
(637
 )    
71,281
     
(943
 )
Commercial mortgage-backed obligations
   
4,756
     
(100
 )    
-
     
-
     
4,756
     
(100
 )
Asset-backed securities
   
18,651
     
(190
 )    
45,263
     
(735
 )    
63,914
     
(925
 )
Equity securities
   
1,157
     
(93
 )    
-
     
-
     
1,157
     
(93
 )
                                                 
Total temporarily impaired
available-for-sale securities
  $
82,912
    $
(726
 )   $
76,470
    $
(1,416
 )   $
159,382
    $
(2,142
 )
                                                 
                                                 
Securities held-to-maturity:
                                                
Residential collateralized mortgage obligations
  $
4,456
    $
(53
 )   $
-
    $
-
     
4,456
     
(53
 )
Commercial mortgage-backed obligations
   
18,736
     
(370
 )    
33,925
     
(997
 )    
52,661
     
(1,367
 )
Asset-backed securities
   
-
     
-
     
5,386
     
(8
 )    
5,386
     
(8
 )
                                                 
Total temporarily impaired
held-to-maturity securities
  $
23,192
    $
(423
 )   $
39,311
    $
(1,005
 )   $
62,503
    $
(1,428
 )