Securities

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

(4) SECURITIES

The following table summarizes the amortized cost and estimated fair values of debt securities held for investment:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(Dollars in thousands)
December 31, 2023
Mortgage backed securities (1)	$	5	$	—	$	—	$	5
States and political subdivisions		685		—		—		685
Other securities		500		—		—		500
Total	$	1,190	$	—	$	—	$	1,190
December 31, 2022
Mortgage backed securities (1)	$	13	$	—	$	—	$	13
States and political subdivisions		1,870		—		—		1,870
Other securities		500		—		—		500
Total	$	2,383	$	—	$	—	$	2,383

The following table summarizes the amortized cost and estimated fair values of debt securities available for sale:


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(Dollars in thousands)
December 31, 2023
U.S. treasuries	$	1,560,265	$	415	$	(62,635	)	$	1,498,045
U.S. federal agencies		11,631		142		(3	)		11,770
Mortgage backed securities (1)		16,459		13		(1,677	)		14,795
States and political subdivisions		10,108		16		(114	)		10,010
Asset backed securities		12,794		—		(282	)		12,512
Other securities		8,163		—		(1,390	)		6,773
Total	$	1,619,420	$	586	$	(66,101	)	$	1,553,905
December 31, 2022
U.S. treasuries	$	1,568,563	$	—	$	(90,699	)	$	1,477,864
U.S. federal agencies		15,025		198		(1	)		15,222
Mortgage backed securities (1)		18,449		21		(1,884	)		16,586
States and political subdivisions		8,320		35		(221	)		8,134
Asset backed securities		13,371		—		(361	)		13,010
Other securities		8,163		—		(758	)		7,405
Total	$	1,631,891	$	254	$	(93,924	)	$	1,538,221

(1)

Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.

The maturities of debt securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity.


	December 31,
	2023				2022
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year	$	350	$	350	$	1,186	$	1,186
After one year but within five years		840		840		1,195		1,195
After five years but within ten years		—		—		2		2
After ten years		—		—		—		—
Total	$	1,190	$	1,190	$	2,383	$	2,383
Available for Sale
Contractual maturity of debt securities:
Within one year	$	348,318	$	341,645	$	101,607	$	100,655
After one year but within five years		1,223,529		1,167,973		1,316,874		1,233,725
After five years but within ten years		10,331		8,851		170,513		163,101
After ten years		37,242		35,436		42,897		40,740
Total debt securities	$	1,619,420	$	1,553,905	$	1,631,891	$	1,538,221

The following is a detail of proceeds from sales and the realized losses on available for sale debt securities:


	Year Ended December 31,
	2023		2022		2021
	(Dollars in thousands)
Proceeds	$	—	$	222,474	$	—
Gross losses realized		—		3,990		—

In March 2022, the Company sold $226 million of debt securities with an average yield of 0.16%, the proceeds of which were subsequently reinvested in $220 million of debt securities with an average yield of 1.86%. The Company used specific identification to reclassify the unrealized loss in other comprehensive income to a realized loss, as shown in the consolidated statements of comprehensive income. There were no sales of securities and therefore no proceeds from sales or realized securities losses on available for sale debt securities for the years ended December 31, 2023 and 2021, respectively.

Realized gains/losses on debt and equity securities are reported as securities transactions within the noninterest income section of the consolidated statements of comprehensive income.

The following table is a summary of the Company’s book value of debt securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law:


	December 31,
	2023		2022
	(Dollars in thousands)
Book value of pledged securities	$	591,324	$	573,952

The following table summarizes debt securities with unrealized losses, segregated by the duration of the unrealized loss, at December 31, 2023 and 2022 respectively:


			Less than 12 Months				More than 12 Months				Total
	Number of investments		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
			(Dollars in thousands)
December 31, 2023
Available for Sale
U.S. treasuries		68	$	4,838	$	90	$	1,401,669	$	62,545	$	1,406,507	$	62,635
U.S. federal agencies		3		1,100		3		—		—		1,100		3
Mortgage backed securities		74		80		—		13,261		1,677		13,341		1,677
States and political subdivisions		6		306		4		1,847		110		2,153		114
Asset backed securities		1		—		—		12,512		282		12,512		282
Other securities		3		—		—		6,773		1,390		6,773		1,390
Total		155	$	6,324	$	97	$	1,436,062	$	66,004	$	1,442,386	$	66,101
December 31, 2022
Available for Sale
U.S. treasuries		74	$	787,925	$	27,078	$	689,939	$	63,621	$	1,477,864	$	90,699
U.S. federal agencies		1		—		—		349		1		349		1
Mortgage backed securities		92		10,001		1,239		5,055		645		15,056		1,884
States and political subdivisions		8		2,308		184		464		37		2,772		221
Asset backed securities		1		13,010		361		—		—		13,010		361
Other securities		3		4,871		291		2,534		467		7,405		758
Total		179	$	818,115	$	29,153	$	698,341	$	64,771	$	1,516,456	$	93,924

The Company has the ability and intent to hold the debt securities classified as held for investment until they mature, at which time the Company will receive full value for the debt securities. Furthermore, as of December 31, 2023 and 2022, the Company also had the ability and intent to hold the debt securities classified as available for sale for a period of time sufficient for a recovery of cost. The unrealized losses are due to increases in market interest rates over the yields available at the time the underlying debt securities were purchased. The fair value of those debt securities having unrealized losses is expected to recover as the securities approach their maturity date or repricing date, or if market yields for such investments decline. The Company has no intent or requirement to sell before the recovery of the unrealized loss; therefore, no impairment loss was realized in the Company’s consolidated statements of comprehensive income.