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Securities (Tables)
 3 Months Ended
Mar. 31, 2022
Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-sale Securities

The amortized cost and fair value of debt securities at March 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
  
$
472,210
    
$
95
    
$
(20,574
)
  
$
451,731
  
State and political subdivisions
    
331,756
      
823
      
(29,917
)
    
302,662
  
U.S. government sponsored agency mortgage-backed securities
    
690,098
      
895
      
(35,780
)
    
655,213
  
Asset-backed securities
    
94,065
      
55
      
(561
)
    
93,559
  
Total available-for-sale securities
  
$
1,588,129
    
$
1,868
    
$
(86,832
)
  
$
1,503,165
  


The amortized cost and fair value of debt securities at December 31, 2021 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
  
$
299,606
    
$
351
    
$
(4,187
)
  
$
295,770
  
State and political subdivisions
    
334,218
      
5,524
      
(5,539
)
    
334,203
  
U.S. government sponsored agency mortgage-backed securities
    
733,467
      
5,107
      
(7,765
)
    
730,809
  
Asset-backed securities
    
94,538
      
301
      
(192
)
    
94,647
  
Total available-for-sale securities
  
$
1,461,829
    
$
11,283
    
$
(17,683
)
  
$
1,455,429
  
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

The amortized cost and fair value of debt securities at March 31, 2022 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
  
$
47,754
    
$
47,673
  
Due after one through five years
    
245,157
      
235,839
  
Due after five through ten years
    
280,613
      
263,396
  
Due after ten years
    
230,442
      
207,485
  
U.S. government sponsored agency mortgage-backed securities
    
690,098
      
655,213
  
Asset-backed securities
    
94,065
      
93,559
  
Total debt securities
  
$
1,588,129
    
$
1,503,165
  
Available for Sale Securities and Held-to-Maturity Securities, Continuous Unrealized Loss Position

CTBI evaluates its investment portfolio on a quarterly basis for impairment.  The analysis performed as of March 31, 2022 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 March 31, 2022 was 87.7%, compared to 72.4% as of December 31, 2021.  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 March 31, 2022 that are not deemed to have credit losses.  As stated above, CTBI had no HTM securities as of March 31, 2022.

Available-for-Sale

(in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Losses
    
Fair Value
  
Less Than 12 Months
                  
U.S. Treasury and government agencies
  
$
395,941
    
$
(17,249
)
  
$
378,692
  
State and political subdivisions
    
204,547
      
(19,287
)
    
185,260
  
U.S. government sponsored agency mortgage-backed securities
    
524,844
      
(29,719
)
    
495,125
  
Asset-backed securities
    
75,952
      
(554
)
    
75,398
  
Total <12 months temporarily impaired AFS securities
    
1,201,284
      
(66,809
)
    
1,134,475
  
                         
12 Months or More
                        
U.S. Treasury and government agencies
    
50,328
      
(3,325
)
    
47,003
  
State and political subdivisions
    
67,941
      
(10,630
)
    
57,311
  
U.S. government sponsored agency mortgage-backed securities
    
84,800
      
(6,061
)
    
78,739
  
Asset-backed securities
    
1,294
      
(7
)
    
1,287
  
Total ≥12 months temporarily impaired AFS securities
    
204,363
      
(20,023
)
    
184,340
  
                         
Total
                        
U.S. Treasury and government agencies
    
446,269
      
(20,574
)
    
425,695
  
State and political subdivisions
    
272,488
      
(29,917
)
    
242,571
  
U.S. government sponsored agency mortgage-backed securities
    
609,644
      
(35,780
)
    
573,864
  
Asset-backed securities
    
77,246
      
(561
)
    
76,685
  
Total temporarily impaired AFS securities
  
$
1,405,647
    
$
(86,832
)
  
$
1,318,815
  


The analysis performed as of December 31, 2021 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, 2021 that are not deemed to be other-than-temporarily impaired.  As stated above, CTBI had no HTM securities as of December 31, 2021.

Available-for-Sale

(in thousands)
  
Amortized
Cost
    
Gross
Unrealized
Losses
    
Fair Value
  
Less Than 12 Months
                  
U.S. Treasury and government agencies
  
$
249,990
    
$
(4,123
)
  
$
245,867
  
State and political subdivisions
    
197,592
      
(4,779
)
    
192,813
  
U.S. government sponsored agency mortgage-backed securities
    
473,831
      
(6,759
)
    
467,072
  
Asset-backed securities
    
52,229
      
(190
)
    
52,039
  
Total <12 months temporarily impaired AFS securities
    
973,642
      
(15,851
)
    
957,791
  
                         
12 Months or More
                        
U.S. Treasury and government agencies
    
14,505
      
(64
)
    
14,441
  
State and political subdivisions
    
19,126
      
(760
)
    
18,366
  
U.S. government sponsored agency mortgage-backed securities
    
62,330
      
(1,006
)
    
61,324
  
Asset-backed securities
    
1,368
      
(2
)
    
1,366
  
Total ≥12 months temporarily impaired AFS securities
    
97,329
      
(1,832
)
    
95,497
  
                         
Total
                        
U.S. Treasury and government agencies
    
264,495
      
(4,187
)
    
260,308
  
State and political subdivisions
    
216,718
      
(5,539
)
    
211,179
  
U.S. government sponsored agency mortgage-backed securities
    
536,161
      
(7,765
)
    
528,396
  
Asset-backed securities
    
53,597
      
(192
)
    
53,405
  
Total temporarily impaired AFS securities
  
$
1,070,971
    
$
(17,683
)
  
$
1,053,288