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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Carrying values of investment securities
The carrying values of investment securities at December 31, 2022 and December 31, 2021 are summarized in the following table (Amounts in Thousands):
 December 31, 2022December 31, 2021
 AmountPercentAmountPercent
Securities available for sale
U.S. Treasury$445,392 57.39 %$243,925 44.24 %
Other securities (FHLB, FHLMC and FNMA)31,934 4.11 %34,467 6.25 %
State and political subdivisions248,582 32.03 %263,516 47.80 %
Mortgage-backed securities and collateralized mortgage obligations50,196 6.47 %9,446 1.71 %
Total securities available for sale$776,104 100.00 %$551,354 100.00 %
Carrying amount of available-for-sale securities and approximate fair values
The carrying amount of available-for-sale securities and their approximate fair values were as follows (Amounts in Thousands):
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Allowance for Credit LossesEstimated
Fair
Value
December 31, 2022:
U.S. Treasury$470,581 $— $(25,189)$— $445,392 
Other securities (FHLB, FHLMC and FNMA)35,255 — (3,321)— 31,934 
State and political subdivisions267,351 239 (19,008)— 248,582 
Mortgage-backed securities and collateralized mortgage obligations57,115 — (6,919)— 50,196 
Total$830,302 $239 $(54,437)$— $776,104 
December 31, 2021:    
U.S. Treasury$244,192 $2,011 $(2,278)$— $243,925 
Other securities (FHLB, FHLMC and FNMA)35,353 — (886)— 34,467 
State and political subdivisions260,266 4,420 (1,170)— 263,516 
Mortgage-backed securities and collateralized mortgage obligations9,575 — (129)— 9,446 
Total$549,386 $6,431 $(4,463)$— $551,354 
Available-for-sale securities classified as per contractual maturities
The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at December 31, 2022, were as follows (Amounts in Thousands).

Amortized
Cost		Fair
Value
Due in one year or less$107,154 $105,708 
Due after one year through five years510,357 480,989 
Due after five years through ten years111,010 101,286 
Due over ten years44,666 37,925 
$773,187 $725,908 
Mortgage-backed securities and collateralized mortgage obligations57,115 50,196 
$830,302 $776,104 
Available-for-sale securities, continuous unrealized loss position, fair value
The following table shows the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2022 and 2021 (Amounts in Thousands):
 Less than 12 months12 months or moreTotal
2022
Description#Fair ValueUnrealized Loss%#Fair ValueUnrealized Loss%#Fair ValueUnrealized Loss%
of Securities   
U.S. Treasury89 $306,407 $(10,695)3.49 %60 $136,486 $(14,494)10.62 %149 $442,893 $(25,189)5.69 %
Other securities (FHLB, FHLMC and FNMA)— — — — %14 31,934 (3,321)10.40 %14 31,934 (3,321)10.40 %
State and political subdivisions479 124,647 (3,351)2.69 %337 87,221 (15,657)17.95 %816 211,868 (19,008)8.97 %
Mortgage-backed securities and collateralized mortgage obligations14 43,035 (5,314)12.35 %4 7,160 (1,605)22.42 %18 50,195 (6,919)13.78 %
582 $474,089 (19,360)4.08 %415 $262,801 (35,077)13.35 %997 $736,890 $(54,437)7.39 %
 Less than 12 months12 months or moreTotal
2021
Description#Fair ValueUnrealized Loss%#Fair ValueUnrealized Loss%#Fair ValueUnrealized Loss%
of Securities   
U.S. Treasury55 $136,867 $(2,203)1.61 %1 $2,416 $(75)3.10 %56 $139,283 $(2,278)1.64 %
Other securities (FHLB, FHLMC and FNMA)5 12,484 (303)2.43 %9 21,984 (583)2.65 %14 34,468 (886)2.57 %
State and political subdivisions231 70,542 (1,055)1.50 %14 9,248 (115)1.24 %245 79,790 (1,170)1.47 %
Mortgage-backed securities and collateralized mortgage obligations4 9,446 (129)1.37 %— — — — %4 9,446 (129)1.37 %
295 $229,339 (3,690)1.61 %24 $33,648 $(773)2.30 %319 $262,987 $(4,463)1.70 %