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Note 4 - Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
 
 
As of December 31, 2016
 
 
 
 
 
 
 
Gross
 
 
Gross
 
 
 
 
 
 
 
Amortized
 
 
Unrealized
 
 
Unrealized
 
 
Estimated
 
(Amounts in thousands)
 
Costs
 
 
Gains
 
 
Losses
 
 
Fair Value
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of state and political subdivisions
   $
58,847
     $
1,001
     $
(420
 )   $
59,428
  
Residential mortgage backed securities and collateralized mortgage obligations
    
71,068
      
33
      
(1,497
 )    
69,604
  
Corporate securities
    
16,153
      
103
      
(140
 )    
16,116
  
Commercial mortgage backed securities
    
15,786
      
9
      
(281
 )    
15,514
  
Other asset backed securities
    
14,664
      
18
      
(170
 )    
14,512
  
Total
   $
176,518
     $
1,164
     $
(2,508
 )   $
175,174
  
Held-to-maturity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of state and political subdivisions
   $
31,187
     $
710
     $
(523
 )   $
31,374
  
 
 
As of December 31, 2015
 
 
 
 
 
 
 
Gross
 
 
Gross
 
 
 
 
 
 
 
Amortized
 
 
Unrealized
 
 
Unrealized
 
 
Estimated
 
(Amounts in thousands)
 
Costs
 
 
Gains
 
 
Losses
 
 
Fair Value
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government & agencies
   $
3,886
     $
57
     $
—
     $
3,943
  
Obligations of state and political subdivisions
    
59,332
      
1,811
      
(39
 )    
61,104
  
Residential mortgage backed securities and collateralized mortgage obligations
    
32,215
      
192
      
(270
 )    
32,137
  
Corporate securities
    
33,775
      
194
      
(191
 )    
33,778
  
Commercial mortgage backed securities
    
12,893
      
10
      
(134
 )    
12,769
  
Other asset backed securities
    
15,331
      
82
      
(114
 )    
15,299
  
Total
   $
157,432
     $
2,346
     $
(748
 )   $
159,030
  
Held-to-maturity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of state and political subdivisions
   $
35,899
     $
966
     $
(220
 )   $
36,645
  
Amortized Cost and Estimated Fair Value Available for Sale Securities [Table Text Block]
 
 
Available-For-Sale
 
 
Held-To-Maturity
 
(Amounts in thousands)
 
Amortized Cost
 
 
Fair Value
 
 
Amortized Cost
 
 
Fair Value
 
Amounts maturing in:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
One year or less
   $
4,636
     $
4,641
     $
—
     $
—
  
One year through five years
    
69,694
      
68,698
      
4,604
      
4,723
  
Five years through ten years
    
43,350
      
43,287
      
13,469
      
13,572
  
After ten years
    
58,838
      
58,548
      
13,114
      
13,079
  
Total
   $
176,518
     $
175,174
     $
31,187
     $
31,374
  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
(Amounts in thousands)
 
Pledged
 
 
Available To
Be Pledged
 
 
Total Held
For Pledging
Purposes
 
Public funds collateral
   $
17,281
     $
6,854
     $
24,135
  
Federal Home Loan Bank of San Francisco borrowings
    
—
      
15,080
      
15,080
  
Total
   $
17,281
     $
21,934
     $
39,215
  
Schedule of Realized Gain (Loss) [Table Text Block]
 
 
For Years Ended December 31,
 
(Amounts in thousands)
 
2016
 
 
2015
 
 
2014
 
Proceeds from sales of securities
   $ 51,025     $ 71,277     $ 93,545  
                         
Gross realized gains on sales of securities:
                        
U.S. government & agencies
   $
—
     $
—
     $
32
  
Obligations of state and political subdivisions
    
188
      
97
      
268
  
Residential mortgage backed securities and collateralized mortgage obligations
    
17
      
142
      
102
  
Corporate securities
    
105
      
161
      
317
  
Commercial mortgage backed securities
    
4
      
14
      
4
  
Other asset backed securities
    
38
      
142
      
73
  
Total gross realized gains on sales of securities
    
352
      
556
      
796
  
Gross realized losses on sales of securities
                        
U.S. government & agencies
    
—
      
(4
 )    
(114
 )
Obligations of state and political subdivisions
    
(3
 )    
(29
 )    
(209
 )
Residential mortgage backed securities and collateralized mortgage obligations
    
(64
 )    
(12
 )    
(570
 )
Corporate securities
    
(27
 )    
(14
 )    
(8
 )
Commercial mortgage backed securities
    
(1
 )    
—
      
(32
 )
Other asset backed securities
    
(13
 )    
(54
 )    
(22
 )
Total gross realized losses on sales of securities
    
(108
 )    
(113
 )    
(955
 )
Gain (loss) on investment securities, net
   $
244
     $
443
     $
(159
 )
Schedule of Unrealized Loss on Investments [Table Text Block]
 
 
As of December 31, 2016
 
 
 
Less Than 12 Months
 
 
12 Months or More
 
 
Total
 
 
 
Fair
 
 
Unrealized
 
 
Fair
 
 
Unrealized
 
 
Fair
 
 
Unrealized
 
(Amounts in thousands)
 
Value
 
 
Losses
 
 
Value
 
 
Losses
 
 
Value
 
 
Losses
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
   $
20,329
     $
(420
 )   $
—
     $
—
     $
20,329
     $
(420
 )
Residential mortgage backed securities and collateralized mortgage obligations
    
52,345
      
(1,396
 )    
4,108
      
(101
 )    
56,453
      
(1,497
 )
Corporate securities
    
8,908
      
(140
 )    
—
      
—
      
8,908
      
(140
 )
Commercial mortgage backed securities
    
12,041
      
(191
 )    
2,849
      
(90
 )    
14,890
      
(281
 )
Other asset backed securities
    
11,419
      
(111
 )    
1,346
      
(59
 )    
12,765
      
(170
 )
Total temporarily impaired securities
   $
105,042
     $
(2,258
 )   $
8,303
     $
(250
 )   $
113,345
     $
(2,508
 )
Held-to-maturity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
   $
11,639
     $
(425
 )   $
933
     $
(98
 )   $
12,572
     $
(523
 )
 
 
As of December 31, 2015
 
 
 
Less Than 12 Months
 
 
12 Months or More
 
 
Total
 
 
 
Fair
 
 
Unrealized
 
 
Fair
 
 
Unrealized
 
 
Fair
 
 
Unrealized
 
(Amounts in thousands)
 
Value
 
 
Losses
 
 
Value
 
 
Losses
 
 
Value
 
 
Losses
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
   $
7,682
     $
(39
 )   $
—
     $
—
     $
7,682
     $
(39
 )
Residential mortgage backed securities and collateralized mortgage obligations
    
16,279
      
(210
 )    
4,931
      
(60
 )    
21,210
      
(270
 )
Corporate securities
    
18,707
      
(191
 )    
—
      
—
      
18,707
      
(191
 )
Commercial mortgage backed securities
    
7,557
      
(62
 )    
1,516
      
(72
 )    
9,073
      
(134
 )
Other asset backed securities
    
4,734
      
(13
 )    
3,430
      
(101
 )    
8,164
      
(114
 )
Total temporarily impaired securities
   $
54,959
     $
(515
 )   $
9,877
     $
(233
 )   $
64,836
     $
(748
 )
Held-to-maturity securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
   $
1,513
     $
(63
 )   $
4,831
     $
(157
 )   $
6,344
     $
(220
 )