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Investment Securities
 12 Months Ended
Dec. 31, 2022
Investment Securities [Abstract]  
Investment Securities
(3)
Investment Securities

The amortized cost, unrealized gains and losses and estimated fair values of investments in debt and other securities at December 31, 2022 are summarized as follows:

 
Amortized
cost
    
Unrealized
gains
    
Unrealized
losses
    
Estimated
fair value
  
Investment securities available-for-sale:
                        
U.S. Treasury securities
  
$
119,644
    
$
13
    
$
(5,842
)
  
$
113,815
  
Securities of U.S. government agencies and corporations
    
128,697
      
20
      
(9,806
)
    
118,911
  
Obligations of states and political subdivisions
    
58,955
      
13
      
(5,642
)
    
53,326
  
Collateralized mortgage obligations
    
114,983
      
—
      
(19,633
)
    
95,350
  
Mortgage-backed securities
    
261,505
      
56
      
(24,871
)
    
236,690
  
                                 
Total debt securities
  
$
683,784
    
$
102
    
$
(65,794
)
  
$
618,092
  

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
  

Gross realized gains from sales and calls of available-for-sale securities were $0 and $322 for the years ended December 31, 2022 and 2021, respectively. Gross realized losses from sales of available-for-sale securities were $152 and $543 for the years ended December 31, 2022 and 2021,  respectively.

The amortized cost and estimated fair value of debt and other securities at December 31, 2022, by contractual maturity, are shown in the following table:

 
Amortized
cost
    
Estimated
fair value
  
             
Maturity in years:
            
Due in one year or less
  
$
52,471
    
$
51,254
  
Due after one year through five years
    
184,189
      
171,618
  
Due after five years through ten years
    
38,225
      
34,754
  
Due after ten years
    
32,411
      
28,426
  
Subtotal
    
307,296
      
286,052
  
MBS and CMO
    
376,488
      
332,040
  
Total
  
$
683,784
    
$
618,092
  

Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. In addition, factors such as prepayments and interest rates may affect the yield on the carrying value of mortgage-related securities.

An analysis of gross unrealized losses of the available-for-sale investment securities portfolio as of December 31, 2022, 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
  
$
54,574
    
$
(1,680
)
  
$
56,872
    
$
(4,162
)
  
$
111,446
    
$
(5,842
)
Securities of U.S. government agencies and corporations
    
45,261
      
(1,341
)
    
69,635
      
(8,465
)
    
114,896
      
(9,806
)
Obligations of states and political subdivisions
    
40,479
      
(3,022
)
    
10,049
      
(2,620
)
    
50,528
      
(5,642
)
Collateralized mortgage obligations
    
36,040
      
(2,586
)
    
59,310
      
(17,047
)
    
95,350
      
(19,633
)
Mortgage-backed securities
    
99,250
      
(6,131
)
    
131,951
      
(18,740
)
    
231,201
      
(24,871
)
                                                 
Total
  
$
275,604
    
$
(14,760
)
  
$
327,817
    
$
(51,034
)
  
$
603,421
    
$
(65,794
)

No decline in value was considered “other-than-temporary” during 2022.  Four hundred securities, all considered investment grade, which had a fair value of $275,604 and a total unrealized loss of $14,760 have been in an unrealized loss position for less than twelve months as of December 31, 2022.  One hundred seventy-one securities, all considered investment grade, which had a fair value of $327,817 and total unrealized loss of $51,034,  have been in an unrealized loss position for more than twelve months as of December 31, 2022.  The unrealized losses on the Company’s investment securities were caused by market conditions for these types of investments, particularly changes in risk-free interest rates.  The Company does not intend to sell the securities and has concluded it is not more likely than not that it will be required to sell these securities prior to recovery of their anticipated cost basis. Therefore, the Company does not consider these investments to be other than temporarily impaired as of December 31, 2022.

The fair value of investment securities could decline in the future if the general economy deteriorates, inflation increases, credit ratings decline, the issuer’s financial condition deteriorates, or the liquidity for securities declines. As a result, other than temporary impairments may occur in the future.

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 corporation
    
48,288
      
(942
)
    
30,158
      
(884
)
    
78,446
      
(1,826
)
Obligations of states and political subdivision
    
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
)

Investment securities carried at $44,319 and $39,695 at December 31, 2022 and 2021, respectively, were pledged to secure public deposits or for other purposes as required or permitted by law.