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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investment Securities [Abstract]  
Amortized Cost, Unrealized Gains and Losses and Estimated Fair Values of Investments in Debt and Other Securities
The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2019 are summarized as follows:

 
 
Amortized cost
  
Unrealized gains
  
Unrealized losses
  
Estimated fair value
 
Investment securities available-for-sale:
            
U.S. Treasury securities
 
$
42,667
  
$
601
  
$
(13
)
 
$
43,255
 
Securities of U.S. government agencies and corporations
  
53,525
   
433
   
(46
)
  
53,912
 
Obligations of states and political subdivisions
  
26,311
   
749
   
(29
)
  
27,031
 
Collateralized mortgage obligations
  
79,470
   
349
   
(399
)
  
79,420
 
Mortgage-backed securities
  
138,733
   
999
   
(453
)
  
139,279
 
 
                
Total debt securities
 
$
340,706
  
$
3,131
  
$
(940
)
 
$
342,897
 

The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2018 are summarized as follows:

 
 
Amortized cost
  
Unrealized gains
  
Unrealized losses
  
Estimated fair value
 
Investment securities available-for-sale:
            
U.S. Treasury Securities
 
$
50,825
  
$
14
  
$
(157
)
 
$
50,682
 
Securities of U.S. government agencies and corporations
  
42,215
   
89
   
(228
)
  
42,076
 
Obligations of states and political subdivisions
  
19,110
   
181
   
(123
)
  
19,168
 
Collateralized mortgage obligations
  
65,615
   
34
   
(1,850
)
  
63,799
 
Mortgage-backed securities
  
142,297
   
147
   
(3,532
)
  
138,912
 
 
                
Total debt securities
 
$
320,062
  
$
465
  
$
(5,890
)
 
$
314,637
 
Amortized Cost and Estimated Fair Value of Debt and Other Securities by Contractual and Expected Maturity
The amortized cost and estimated fair value of debt and other securities at December 31, 2019, by contractual and expected maturity, are shown in the following table:

  
Amortized
cost
  
Estimated
fair value
 
 
      
Maturity in years:
      
Due in one year or less
 
$
35,743
  
$
35,848
 
Due after one year through five years
  
59,496
   
60,374
 
Due after five years through ten years
  
16,155
   
16,564
 
Due after ten years
  
11,109
   
11,412
 
Subtotal 
  
122,503
   
124,198
 
MBS and CMO
  
218,203
   
218,699
 
Total
 
$
340,706
  
$
342,897
 
Analysis of Gross Unrealized Losses of the Available-for-sale Investment Securities Portfolio
An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2019, follows:

 
 
Less than 12 months
  
12 months or more
  
Total
 
 
 
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
 
U.S. Treasury securities
 
$
10,113
  
$
(8
)
 
$
2,015
  
$
(5
)
 
$
12,128
  
$
(13
)
Securities of U.S. government agencies and corporations
  
13,187
   
(44
)
  
1,998
   
(2
)
  
15,185
   
(46
)
Obligations of states and political subdivisions
  
4,645
   
(29
)
  
—
   
—
   
4,645
   
(29
)
Collateralized mortgage obligations
  
21,763
   
(129
)
  
21,132
   
(270
)
  
42,895
   
(399
)
Mortgage-backed securities
  
11,970
   
(28
)
  
44,433
   
(425
)
  
56,403
   
(453
)
 
                        
Total
 
$
61,678
  
$
(238
)
 
$
69,578
  
$
(702
)
 
$
131,256
  
$
(940
)

An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2018, follows:

 
 
Less than 12 months
  
12 months or more
  
Total
 
 
 
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
  
Fair Value
  
Unrealized losses
 
U.S. Treasury Securities
 
$
37,805
  
$
(67
)
 
$
5,951
  
$
(90
)
 
$
43,756
  
$
(157
)
Securities of U.S. government agencies and corporation
  
16,959
   
(39
)
  
13,540
   
(189
)
  
30,499
   
(228
)
Obligations of states and political subdivision
  
847
   
(2
)
  
9,134
   
(121
)
  
9,981
   
(123
)
Collateralized mortgage obligations
  
2,217
   
(6
)
  
53,217
   
(1,844
)
  
55,434
   
(1,850
)
Mortgage-backed securities
  
16,358
   
(123
)
  
105,361
   
(3,409
)
  
121,719
   
(3,532
)
 
                        
Total
 
$
74,186
  
$
(237
)
 
$
187,203
  
$
(5,653
)
 
$
261,389
  
$
(5,890
)