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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020 are summarized as follows:

  
Amortized
cost
    
Unrealized
gains
    
Unrealized
losses
    
Estimated
fair value
  
Investment securities available-for-sale:
                        
U.S. Treasury securities
  
$
37,910
    
$
982
    
$
(1
)
  
$
38,891
  
Securities of U.S. government agencies and corporations
    
105,506
      
1,317
      
(265
)
    
106,558
  
Obligations of states and political subdivisions
    
31,013
      
1,878
      
(9
)
    
32,882
  
Collateralized mortgage obligations
    
71,531
      
1,937
      
(8
)
    
73,460
  
Mortgage-backed securities
    
179,021
      
4,359
      
(91
)
    
183,289
  
                                 
Total debt securities
  
$
424,981
    
$
10,473
    
$
(374
)
  
$
435,080
  

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
  
Amortized Cost and Estimated Fair Value of Debt and Other Securities by Contractual or Expected Maturity
The amortized cost and estimated fair value of debt and other securities at December 31, 2020, by contractual maturity, are shown in the following table:

  
Amortized
cost
    
Estimated
fair value
  
             
Maturity in years:
            
Due in one year or less
  
$
16,281
    
$
16,447
  
Due after one year through five years
    
78,502
      
80,214
  
Due after five years through ten years
    
58,501
      
59,251
  
Due after ten years
    
21,145
      
22,419
  
Subtotal
    
174,429
      
178,331
  
MBS and CMO
    
250,552
      
256,749
  
Total
  
$
424,981
    
$
435,080
  
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, 2020, 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
  
$
4,276
    
$
(1
)
  
$
—
    
$
—
    
$
4,276
    
$
(1
)
Securities of U.S. government agencies and corporations
    
58,164
      
(265
)
    
—
      
—
      
58,164
      
(265
)
Obligations of states and political subdivisions
    
1,603
      
(9
)
    
—
      
—
      
1,603
      
(9
)
Collateralized mortgage obligations
    
1,697
      
(8
)
    
—
      
—
      
1,697
      
(8
)
Mortgage-backed securities
    
30,208
      
(91
)
    
—
      
—
      
30,208
      
(91
)
                                                 
Total
  
$
95,948
    
$
(374
)
  
$
—
    
$
—
    
$
95,948
    
$
(374
)

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 corporation
    
13,187
      
(44
)
    
1,998
      
(2
)
    
15,185
      
(46
)
Obligations of states and political subdivision
    
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
)