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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Investment Securities [Abstract]  
Amortized Cost, Unrealized Gains and Losses, Estimated Fair Values and Related Allowance for Credit Losses on Investments in Debt and Other Securities
The amortized cost, unrealized gains and losses, estimated fair values and related allowance for credit losses on investments in debt and other securities at December 31, 2024 are summarized as follows:

 
Amortized
cost
    
Unrealized
gains
    
Unrealized
losses
    
Estimated
fair value
     ACL
  
Investment securities available-for-sale:
                              
U.S. Treasury securities
  
$
107,188
    
$
134
    
$
(1,777
)
  
$
105,545
     $
 —  
Securities of U.S. government agencies and corporations
    
100,218
      
62
      
(4,596
)
    
95,684
       —  
Obligations of states and political subdivisions
    
72,576
      
87
      
(5,072
)
    
67,591
       —  
Collateralized mortgage obligations
    
113,641
      
5
      
(18,701
)
    
94,945
       —  
Mortgage-backed securities
    
288,723
      
70
      
(18,705
)
    
270,088
       —  
                                     
 
Total debt securities
  
$
682,346
    
$
358
    
$
(48,851
)
  
$
633,853
     $
 —  

The amortized cost, unrealized gains and losses, estimated fair values and related allowance for credit losses on investments in debt and other securities at December 31, 2023 are summarized as follows:

   
Amortized
cost
    
Unrealized
gains
    
Unrealized
losses
    
Estimated
fair value
    
ACL
  
Investment securities available-for-sale:
                              
U.S. Treasury securities
  
$
90,063
    
$
134
    
$
(3,015
)
  
$
87,182
    
$
—
  
Securities of U.S. government agencies and corporations
    
121,305
      
105
      
(6,331
)
    
115,079
      
—
  
Obligations of states and political subdivisions
    
55,021
      
237
      
(3,581
)
    
51,677
      
—
  
Collateralized mortgage obligations
    
107,658
      
15
      
(16,726
)
    
90,947
      
—
  
Mortgage-backed securities
    
246,267
      
242
      
(19,037
)
    
227,472
      
—
  
                                         
Total debt securities
  
$
620,314
    
$
733
    
$
(48,690
)
  
$
572,357
    
$
—
  
Amortized Cost and Estimated Fair Value of Debt and Other Securities by Contractual Maturity
The amortized cost and estimated fair value of debt and other securities at December 31, 2024, by contractual maturity, are shown in the following table:

 
Amortized
cost
    
Estimated
fair value
  
             
Maturity in years:
            
Due in one year or less
  
$
62,647
    
$
62,107
  
Due after one year through five years
    
131,918
      
127,071
  
Due after five years through ten years
    
40,745
      
38,370
  
Due after ten years
    
44,672
      
41,272
  
Subtotal
    
279,982
      
268,820
  
Mortgage-backed securities and Collateralized mortgage obligations
    
402,364
      
365,033
  
Total
  
$
682,346
    
$
633,853
  
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, 2024, 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
  
$
27,055
    
$
(431
)
  
$
42,603
    
$
(1,346
)
  
$
69,658
    
$
(1,777
)
Securities of U.S. government agencies and corporations
    
22,383
      
(471
)
    
58,585
      
(4,125
)
    
80,968
      
(4,596
)
Obligations of states and political subdivisions
    
33,078
      
(1,083
)
    
29,025
      
(3,989
)
    
62,103
      
(5,072
)
Collateralized mortgage obligations
    
28,937
      
(1,860
)
    
62,320
      
(16,841
)
    
91,257
      
(18,701
)
Mortgage-backed securities
    
110,599
      
(2,715
)
    
143,892
      
(15,990
)
    
254,491
      
(18,705
)
                                                 
Total
  
$
222,052
    
$
(6,560
)
  
$
336,425
    
$
(42,291
)
  
$
558,477
    
$
(48,851
)

An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2023, 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
  
$
—
    
$
-
 
$
77,203
    
$
(3,015
)
  
$
77,203
    
$
(3,015
)
Securities of U.S. government agencies and corporation
    
3,424
      
(7
)
    
97,057
      
(6,324
)
    
100,481
      
(6,331
)
Obligations of states and political subdivision
    
4,981
      
(31
)
    
32,578
      
(3,550
)
    
37,559
      
(3,581
)
Collateralized mortgage obligations
    
6,597
      
(26
)
    
80,995
      
(16,700
)
    
87,592
      
(16,726
)
Mortgage-backed securities
    
17,023
      
(124
)
    
182,626
      
(18,913
)
    
199,649
      
(19,037
)
                                                 
Total
  
$
32,025
    
$
(188
)
  
$
470,459
    
$
(48,502
)
  
$
502,484
    
$
(48,690
)