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Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-sale Securities

The amortized cost and fair value of debt securities at December 31, 2023 are summarized as follows:

Available-for-Sale

(in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Fair Value
  
U.S. Treasury and government agencies
  
$
381,268
    
$
121
    
$
(26,572
)
  
$
354,817
  
State and political subdivisions
    
313,147
      
88
      
(48,290
)
    
264,945
  
U.S. government sponsored agency mortgage-backed securities
    
518,836
      
36
      
(62,136
)
    
456,736
  
Asset-backed securities
    
87,993
      
0
      
(767
)
    
87,226
  
Total available-for-sale securities
  
$
1,301,244
    
$
245
    
$
(137,765
)
  
$
1,163,724
  


The amortized cost and fair value of debt securities at December 31, 2022 are summarized as follows:

Available-for-Sale

(in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Fair Value
  
U.S. Treasury and government agencies
  
$
418,579
    
$
212
    
$
(36,859
)
  
$
381,932
  
State and political subdivisions
    
326,746
      
32
      
(61,676
)
    
265,102
  
U.S. government sponsored agency mortgage-backed securities
    
593,917
      
1
      
(73,833
)
    
520,085
  
Asset-backed securities
    
91,363
      
0
      
(2,256
)
    
89,107
  
Total available-for-sale securities
  
$
1,430,605
    
$
245
    
$
(174,624
)
  
$
1,256,226
  
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

The amortized cost and fair value of debt securities at December 31, 2023 by contractual maturity are shown below.  Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

 
Available-for-Sale
  
(in thousands)
  
Amortized
Cost
    
Fair Value
  
Due in one year or less
  
$
20,103
    
$
20,052
  
Due after one through five years
    
372,903
      
345,658
  
Due after five through ten years
    
133,727
      
116,001
  
Due after ten years
    
167,682
      
138,051
  
U.S. government sponsored agency mortgage-backed securities
    
518,836
      
456,736
  
Asset-backed securities
    
87,993
      
87,226
  
Total debt securities
  
$
1,301,244
    
$
1,163,724
  
Available for Sale Securities, Continuous Unrealized Loss Position

CTBI evaluates its investment portfolio on a quarterly basis for impairment.  The analysis performed as of December 31, 2023 indicates that all impairment is considered temporary, market and interest rate driven, and not credit-related.  The percentage of total debt securities with unrealized losses as of December 31, 2023 was 97.3% compared to 97.4% as of December 31, 2022.  The following table provides the amortized cost, gross unrealized losses, and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2023 that are not deemed to have credit losses.

Available-for-Sale

(in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Losses
    
Fair Value
  
Less Than 12 Months
                  
U.S. Treasury and government agencies
  
$
3,761
    
$
(5
)
  
$
3,756
  
State and political subdivisions
    
16,154
      
(1,250
)
    
14,904
  
U.S. government sponsored agency mortgage-backed securities
    
16,056
      
(289
)
    
15,767
  
Asset-backed securities
    
0
      
0
   
0
  
Total <12 months temporarily impaired AFS securities
    
35,971
      
(1,544
)
    
34,427
  
                         
12 Months or More
                        
U.S. Treasury and government agencies
    
361,038
      
(26,567
)
    
334,471
  
State and political subdivisions
    
284,397
      
(47,040
)
    
237,357
  
U.S. government sponsored agency mortgage-backed securities
    
500,763
      
(61,847
)
    
438,916
  
Asset-backed securities
    
87,993
      
(767
)
    
87,226
  
Total ≥12 months temporarily impaired AFS securities
    
1,234,191
      
(136,221
)
    
1,097,970
  
                         
Total
                        
U.S. Treasury and government agencies
    
364,799
      
(26,572
)
    
338,227
  
State and political subdivisions
    
300,551
      
(48,290
)
    
252,261
  
U.S. government sponsored agency mortgage-backed securities
    
516,819
      
(62,136
)
    
454,683
  
Asset-backed securities
    
87,993
      
(767
)
    
87,226
  
Total temporarily impaired AFS securities
  
$
1,270,162
    
$
(137,765
)
  
$
1,132,397
  


The analysis performed as of December 31, 2022 indicated that all impairment was considered temporary, market and interest rate driven, and not credit-related.  The following table provides the amortized cost, gross unrealized losses, and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2022 that are not deemed to be other-than-temporarily impaired.

Available-for-Sale

(in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Losses
    
Fair Value
  
Less Than 12 Months
                  
U.S. Treasury and government agencies
  
$
144,305
    
$
(6,953
)
  
$
137,352
  
State and political subdivisions
    
94,277
      
(6,257
)
    
88,020
  
U.S. government sponsored agency mortgage-backed securities
    
139,314
      
(6,883
)
    
132,431
  
Asset-backed securities
    
38,882
      
(1,231
)
    
37,651
  
Total <12 months temporarily impaired AFS securities
    
416,778
      
(21,324
)
    
395,454
  
                         
12 Months or More
                        
U.S. Treasury and government agencies
    
249,424
      
(29,906
)
    
219,518
  
State and political subdivisions
    
225,019
      
(55,419
)
    
169,600
  
U.S. government sponsored agency mortgage-backed securities
    
454,357
      
(66,950
)
    
387,407
  
Asset-backed securities
    
52,480
      
(1,025
)
    
51,455
  
Total ≥12 months temporarily impaired AFS securities
    
981,280
      
(153,300
)
    
827,980
  
                         
Total
                        
U.S. Treasury and government agencies
    
393,729
      
(36,859
)
    
356,870
  
State and political subdivisions
    
319,296
      
(61,676
)
    
257,620
  
U.S. government sponsored agency mortgage-backed securities
    
593,671
      
(73,833
)
    
519,838
  
Asset-backed securities
    
91,362
      
(2,256
)
    
89,106
  
Total temporarily impaired AFS securities
  
$
1,398,058
    
$
(174,624
)
  
$
1,223,434