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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021 are summarized as follows:

 
Amortized
cost
    
Unrealized
gains
    
Unrealized
losses
    
Estimated
fair value
  
Investment securities available-for-sale:
                        
U.S. Treasury securities
  
$
86,534
    
$
388
    
$
(711
)
  
$
86,211
  
Securities of U.S. government agencies and corporations
    
104,106
      
330
      
(1,826
)
    
102,610
  
Obligations of states and political subdivisions
    
44,842
      
1,444
      
(301
)
    
45,985
  
Collateralized mortgage obligations
    
137,872
      
665
      
(2,885
)
    
135,652
  
Mortgage-backed securities
    
262,738
      
1,971
      
(2,954
)
    
261,755
  
                                 
Total debt securities
  
$
636,092
    
$
4,798
    
$
(8,677
)
  
$
632,213
  

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
  
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, 2021, by contractual maturity, are shown in the following table:

 
Amortized
cost
    
Estimated
fair value
  
             
Maturity in years:
            
Due in one year or less
  
$
15,115
    
$
15,279
  
Due after one year through five years
    
151,898
      
151,022
  
Due after five years through ten years
    
40,443
      
39,822
  
Due after ten years
    
28,026
      
28,683
  
Subtotal
    
235,482
      
234,806
  
MBS and CMO
    
400,610
      
397,407
  
Total
  
$
636,092
    
$
632,213
  
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, 2021, 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
  
$
63,254
    
$
(673
)
  
$
2,066
    
$
(38
)
  
$
65,320
    
$
(711
)
Securities of U.S. government agencies and corporations
    
48,288
      
(942
)
    
30,158
      
(884
)
    
78,446
      
(1,826
)
Obligations of states and political subdivisions
    
11,680
      
(233
)
    
934
      
(68
)
    
12,614
      
(301
)
Collateralized mortgage obligations
    
90,299
      
(2,850
)
    
1,298
      
(35
)
    
91,597
      
(2,885
)
Mortgage-backed securities
    
175,943
      
(2,816
)
    
6,997
      
(138
)
    
182,940
      
(2,954
)
                                                 
Total
  
$
389,464
    
$
(7,514
)
  
$
41,453
    
$
(1,163
)
  
$
430,917
    
$
(8,677
)

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 corporation
    
58,164
      
(265
)
    
—
      
—
      
58,164
      
(265
)
Obligations of states and political subdivision
    
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
)