AFS Securities

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows as of December 31:


	2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	231,622	$	—	$	22,921	$	208,701
States and political subdivisions	122,023		392		4,903		117,512
Auction rate money market preferred	3,200		—		858		2,342
Mortgage-backed securities	42,309		—		3,239		39,070
Collateralized mortgage obligations	218,301		—		12,573		205,728
Corporate	8,150		—		1,022		7,128
Total	$	625,605	$	392	$	45,516	$	580,481


	2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury	$	212,379	$	—	$	2,676	$	209,703
States and political subdivisions	116,836		4,457		88		121,205
Auction rate money market preferred	3,200		42		—		3,242
Mortgage-backed securities	54,710		1,438		—		56,148
Collateralized mortgage obligations	90,435		1,876		10		92,301
Corporate	8,150		19		167		8,002
Total	$	485,710	$	7,832	$	2,941	$	490,601

The amortized cost and fair value of AFS securities by contractual maturity at December 31, 2022 are as follows:


	Maturing								Securities with Variable Monthly Payments or Noncontractual Maturities
	Due in One Year or Less		After One Year But Within Five Years		After Five Years But Within Ten Years		After Ten Years				Total
U.S. Treasury	$	—	$	231,622	$	—	$	—	$	—	$	231,622
States and political subdivisions	19,753		42,946		21,234		38,090		—		122,023
Auction rate money market preferred	—		—		—		—		3,200		3,200
Mortgage-backed securities	—		—		—		—		42,309		42,309
Collateralized mortgage obligations	—		—		—		—		218,301		218,301
Corporate	—		—		8,150		—		—		8,150
Total amortized cost	$	19,753	$	274,568	$	29,384	$	38,090	$	263,810	$	625,605
Fair value	$	19,666	$	251,479	$	27,703	$	34,493	$	247,140	$	580,481

Expected maturities for government sponsored enterprises and states and political subdivisions may differ from contractual maturities because issuers may have the right to call or prepay obligations.

As the auction rate money market preferred investments have continual call dates, they are not reported by a specific maturity group. Because of their variable monthly payments, mortgage-backed securities and collateralized mortgage obligations are not reported by a specific maturity group.

A summary of the sales activity of AFS securities during the years ended December 31 is displayed in the following table.


	2022		2021		2020
Proceeds from sales of AFS securities	$	—	$	—	$	26,855
Realized gains (losses)	$	—	$	—	$	71
Applicable income tax expense (benefit)	$	—	$	—	$	15

The information on the following tables pertains to AFS securities with gross unrealized losses at December 31, 2022 and 2021 aggregated by investment category and length of time that individual securities have been in a continuous loss position.


	December 31, 2022
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
U.S. Treasury	$	1,388	$	18,331	$	21,533	$	190,369	$	22,921
States and political subdivisions	2,389		48,083		2,514		40,667		4,903
Auction rate money market preferred	—		—		858		2,342		858
Mortgage-backed securities	3,239		39,069		—		—		3,239
Collateralized mortgage obligations	12,408		201,316		165		4,411		12,573
Corporate	—		—		1,022		7,128		1,022
Total	$	19,424	$	306,799	$	26,092	$	244,917	$	45,516
Number of securities in an unrealized loss position:			178				266		444


	December 31, 2021
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
U.S. Treasury	$	2,676	$	209,703	$	—	$	—	$	2,676
States and political subdivisions	88		9,674		—		—		88
Collateralized mortgage obligations	10		11,165		—		—		10
Corporate	167		6,283		—		—		167
Total	$	2,941	$	236,825	$	—	$	—	$	2,941
Number of securities in an unrealized loss position:			40				—		40

The unrealized loss on our AFS securities portfolio resulted from the recent increases in short-term and intermediate-term interest rates.

As of December 31, 2022 and 2021, we conducted an analysis to determine whether any AFS securities currently in an unrealized loss position should be identified as other-than-temporarily impaired. Such analyses considered, among other factors, the following criteria:

•Has the value of the investment declined more than what is deemed to be reasonable based on a risk and maturity adjusted discount rate?

•Is the investment credit rating below investment grade?

•Is it probable the issuer will be unable to pay the amount when due?

•Is it more likely than not that we will have to sell the security before recovery of its cost basis?

•Has the duration of the investment been extended?

Based on our analysis, which included the criteria outlined above and the fact that we have asserted that we do not have to sell any AFS securities in an unrealized loss position, we do not believe that the values of any AFS securities are other-than-temporarily impaired as of December 31, 2022 and 2021, with the exception of one municipal bond previously identified in 2016 which had no activity during the period.